Add iOS 27 hook source, browser integration and build scripts

.gitignore

@@ -1 +1,4 @@
 .DS_Store
+source/hook/build/
+source/hook/AppsManagerHook.dylib
+source/out/

README.md

@@ -12,6 +12,7 @@
 
 - IPA：[AppsManager_iOS27.ipa](AppsManager_iOS27.ipa)
 - 校验文件 / Checksums：[SHA256SUMS.txt](SHA256SUMS.txt)
+- 源码 / Source：[source/](source/)（iOS 27 Hook、内置文件浏览器集成与构建脚本 / iOS 27 hook, file-browser integration and build scripts）
 
 ```text
 eebc7b69884aaf302dbd9a0750f9b47f96800867fe5a316b83be9957facbd12c  AppsManager_iOS27.ipa
@@ -76,6 +77,8 @@ eebc7b69884aaf302dbd9a0750f9b47f96800867fe5a316b83be9957facbd12c  AppsManager_iO
   When a third-party app bundle cannot be read, its version or icon may show `null` / a placeholder; this does not affect backup, restore, or file browsing.
 - 本仓库仅用于自用测试与数据迁移，请遵守目标 App 的许可协议和当地法律法规。  
   This repository is intended for personal testing and data migration only. Respect the target apps' licenses and applicable laws.
+- 源码中的 WQ Files 相关部分遵循 GPL-3.0-or-later，详见 [source/LICENSE](source/LICENSE)。  
+  WQ Files-derived source is licensed under GPL-3.0-or-later; see [source/LICENSE](source/LICENSE).
 
 ## 校验 / Checksum
 

source/LICENSE

@@ -0,0 +1,674 @@
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+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.

source/README.md

@@ -0,0 +1,112 @@
+# AppsManager iOS 27 Source
+
+**中文：** 这是 **Apps Manager** 的 iOS 27 非官方分支的源码部分。应用名仍为 **AppsManager**，仓库名为 **AppsManager27**。
+
+**English:** This is the source portion of the unofficial iOS 27 fork of **Apps Manager**. The app name remains **AppsManager**; the repository is named **AppsManager27**.
+
+> 本目录只包含 iOS 27 兼容 Hook、内置文件浏览器集成和构建脚本。原版 Apps Manager 的应用本体源码是闭源的，不在此仓库中；构建时需要你自己提供原始 IPA 中解包出的 `ADManager.app`，以及签名证书和描述文件。  
+> This directory contains only the iOS 27 compatibility hook, the built-in file browser integration, and build scripts. The original Apps Manager app source is proprietary and is not included. You must provide the extracted `ADManager.app` from the original IPA, plus your own signing certificate and provisioning profile.
+
+## 目录结构 / Layout
+
+```text
+source/
+├── hook/src/
+│   ├── WBHook.m                 # AppsManager iOS 27 hook and feature fixes
+│   ├── main.m                   # WQ Files browser UI, modified for AppsManager
+│   └── WQ*.m / WQ*.h            # WQ Files file browser, editors, media, ZIP, etc.
+├── build_dylib.sh               # Compile AppsManagerHook.dylib
+├── build_app.sh                 # Inject the dylib, sign the app bundle
+├── LICENSE                      # GPL-3.0 (WQ Files-derived source)
+└── README.md
+```
+
+## 主要修改 / Main changes
+
+- Hook `LSApplicationWorkspace` and `LSApplicationProxy` to expose app containers.
+- Parse the LaunchServices CSStore database for bundle/container/name mapping.
+- Grant per-container access through `worse_query`.
+- Real app data sizes, pull-to-refresh full size scan.
+- Backup / restore with fallback for the keychain nil-array failure.
+- Wipe user data using `worse_query`-backed recursive deletion.
+- Recalculate the affected app size after backup, restore and wipe.
+- Detail page version/path/date/app-group support.
+- Replace the `filza://` prompt with the built-in WQ Files browser.
+- Present media through the native `AVPlayerViewController`.
+
+## 构建要求 / Build requirements
+
+- macOS with Xcode command line tools and an iPhoneOS SDK.
+- `insert_dylib` / `idylib` available in `PATH`, or set `INSERT_DYLIB`.
+- An original `ADManager.app` extracted from the IPA you are allowed to modify.
+- A code signing identity and a `.mobileprovision` for your target device(s).
+- An entitlements plist that includes the App Group used by `worse_query`.
+
+## 构建 / Build
+
+### 1. Compile the dylib
+
+```sh
+cd source
+./build_dylib.sh
+```
+
+Output: `source/hook/AppsManagerHook.dylib`
+
+### 2. Build and sign the app
+
+```sh
+export APP_SOURCE="/path/to/Payload/ADManager.app"
+export PROVISION="/path/to/your.mobileprovision"
+export SIGN_IDENTITY="Apple Distribution: Your Name (TEAMID)"
+export ENTITLEMENTS="/path/to/entitlements.plist"
+export KEYCHAIN="/path/to/signing.keychain"   # optional
+export INSERT_DYLIB="/path/to/idylib"         # optional if already in PATH
+
+./build_app.sh
+```
+
+Output: `source/out/AppsManager.app`
+
+The script:
+
+1. Copies the original app bundle.
+2. Injects `AppsManagerHook.dylib` into `ADManager`.
+3. Sets `CFBundleIdentifier` to `com.jbjf.appsmanager` by default.
+4. Embeds your provisioning profile.
+5. Signs the dylib and the app with your identity.
+
+You can override `BUNDLE_ID` and `OUT_DIR` if needed.
+
+## 签名与权限 / Signing and entitlements
+
+The published IPA is signed for a personal certificate and is not installable on arbitrary devices. Re-sign with your own certificate.
+
+For `worse_query` and App Group access, the app needs the relevant entitlements from your provisioning profile, including an App Group. The original build used an App Group such as:
+
+```text
+group.<your-team-id>.<your-app-id>.01
+```
+
+The exact value must match your own profile. Do not reuse someone else's certificate, profile, or App Group.
+
+## 第三方代码 / Third-party code
+
+This source includes and links code from:
+
+- **WQ Files** by kolbicz — <https://github.com/kolbicz/WQFiles> — GPL-3.0-or-later.
+- **worse_query** by Taj C (forcequit) — <https://github.com/forcequitOS/worse_query> — GPL-3.0-or-later.
+
+The WQ Files-derived files retain their copyright headers. See `LICENSE` for the full GPL-3.0 text. The AppsManager hook source in this directory is distributed under the same GPL-3.0-or-later terms to the extent required by the combined work.
+
+## 测试 / Tested
+
+- iPhone 18 Pro Max (iPhone19,7)
+- iOS 27.0.1 (24A446)
+
+## 说明 / Notes
+
+- Activation remains trial; no activation bypass is included.
+- Keychain data cannot be wiped due to sandbox/permission restrictions.
+- Some third-party bundles cannot be read; version/icon may be `null` or a placeholder.
+- Use this source only for personal testing and data migration. Respect the original apps' licenses and applicable laws.

source/build_app.sh

@@ -0,0 +1,69 @@
+#!/bin/sh
+# Build and sign AppsManager.app after build_dylib.sh has produced the dylib.
+#
+# Required environment:
+#   APP_SOURCE      Path to the original extracted ADManager.app
+#   PROVISION       Path to a .mobileprovision for the target device(s)
+#   SIGN_IDENTITY   Code signing identity, e.g. "Apple Distribution: Name (TEAMID)"
+#
+# Optional:
+#   ENTITLEMENTS    Path to an entitlements plist (needed for App Group access)
+#   KEYCHAIN        Keychain path for codesign
+#   INSERT_DYLIB    Path to the insert_dylib/idylib tool (default: idylib)
+#   OUT_DIR         Output directory (default: <source>/out)
+#   BUNDLE_ID       CFBundleIdentifier (default: com.jbjf.appsmanager)
+set -eu
+
+ROOT=$(CDPATH= cd -- "$(dirname -- "$0")" && pwd)
+APP_SOURCE=${APP_SOURCE:?Set APP_SOURCE to the extracted original ADManager.app}
+PROVISION=${PROVISION:?Set PROVISION to your .mobileprovision}
+SIGN_IDENTITY=${SIGN_IDENTITY:?Set SIGN_IDENTITY to your code signing identity}
+ENTITLEMENTS=${ENTITLEMENTS:-}
+KEYCHAIN=${KEYCHAIN:-}
+INSERT_DYLIB=${INSERT_DYLIB:-idylib}
+OUT_DIR=${OUT_DIR:-"$ROOT/out"}
+BUNDLE_ID=${BUNDLE_ID:-com.jbjf.appsmanager}
+DYLIB="$ROOT/hook/AppsManagerHook.dylib"
+APP="$OUT_DIR/AppsManager.app"
+
+if [ ! -f "$DYLIB" ]; then
+  echo "Missing $DYLIB; run build_dylib.sh first." >&2
+  exit 1
+fi
+if [ ! -d "$APP_SOURCE" ]; then
+  echo "APP_SOURCE is not a directory: $APP_SOURCE" >&2
+  exit 1
+fi
+if ! command -v "$INSERT_DYLIB" >/dev/null 2>&1; then
+  echo "insert_dylib tool not found: $INSERT_DYLIB" >&2
+  exit 1
+fi
+
+rm -rf "$APP"
+mkdir -p "$OUT_DIR"
+cp -R "$APP_SOURCE" "$APP"
+cp "$DYLIB" "$APP/AppsManagerHook.dylib"
+cp "$PROVISION" "$APP/embedded.mobileprovision"
+
+plutil -replace CFBundleIdentifier -string "$BUNDLE_ID" "$APP/Info.plist"
+plutil -replace CFBundleDisplayName -string "Apps Manager" "$APP/Info.plist"
+plutil -replace CFBundleName -string "AppsManager" "$APP/Info.plist"
+
+cp "$APP/ADManager" "$APP/ADManager.orig"
+"$INSERT_DYLIB" --inplace --overwrite --strip-codesig --all-yes \
+  "@executable_path/AppsManagerHook.dylib" "$APP/ADManager"
+rm -f "$APP/ADManager.orig"
+
+set -- -f -s "$SIGN_IDENTITY"
+if [ -n "$KEYCHAIN" ]; then
+  set -- "$@" --keychain "$KEYCHAIN"
+fi
+if [ -n "$ENTITLEMENTS" ]; then
+  set -- "$@" --entitlements "$ENTITLEMENTS" --generate-entitlement-der
+fi
+
+codesign "$@" "$APP/AppsManagerHook.dylib"
+codesign "$@" "$APP"
+
+echo "built $APP"
+otool -L "$APP/ADManager" | head -8

source/build_dylib.sh

@@ -0,0 +1,33 @@
+#!/bin/sh
+# Build the AppsManagerHook.dylib.
+# Requires macOS with Xcode command line tools and an iPhoneOS SDK.
+set -eu
+
+ROOT=$(CDPATH= cd -- "$(dirname -- "$0")" && pwd)
+SRC="$ROOT/hook/src"
+OUT="$ROOT/hook/build"
+
+rm -rf "$OUT"
+mkdir -p "$OUT"
+cd "$SRC"
+
+CFLAGS="-arch arm64 -miphoneos-version-min=15.0 -fobjc-arc -I. -O1"
+FILES="WQCore WQLocalization WQAccess WQLaunchServices WQUI WQSharing WQApps WQCache WQPlistEditor WQHexViewer WQSQLiteViewer WQArchive WQSyntax WQMediaStream WBHook"
+
+for f in $FILES; do
+  echo "compile $f"
+  xcrun -sdk iphoneos clang $CFLAGS -c "$f.m" -o "$OUT/$f.o"
+done
+
+echo "compile main"
+xcrun -sdk iphoneos clang $CFLAGS -Dmain=wqfiles_unused_main -c main.m -o "$OUT/main.o"
+
+echo "link"
+xcrun -sdk iphoneos clang -arch arm64 -miphoneos-version-min=15.0 -dynamiclib \
+  -o "$ROOT/hook/AppsManagerHook.dylib" "$OUT"/*.o \
+  -framework Foundation -framework UIKit -framework Security \
+  -framework UniformTypeIdentifiers -framework AVKit -framework AVFoundation \
+  -framework CoreMedia -framework CoreGraphics -framework QuartzCore \
+  -lsqlite3 -lz
+
+echo "built $ROOT/hook/AppsManagerHook.dylib"

source/hook/src/WQAccess.h

@@ -0,0 +1,193 @@
+//
+//  WQAccess.h
+//  WQ Files
+//
+//  File access outside the sandbox through the worse_query technique by
+//  Taj C (forcequit), https://github.com/forcequitOS/worse_query,
+//  GPL-3.0-or-later. This reimplementation is GPL-3.0-or-later as well.
+//
+
+#import <Foundation/Foundation.h>
+#import "WQLaunchServices.h"
+#import <sys/stat.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+// Log shared with the UI.
+void wq_log(NSString *format, ...) NS_FORMAT_FUNCTION(1, 2);
+NSString *wq_log_text(void);
+
+// Picks the app group the signer actually gave us. Nil when there is none.
+NSString *_Nullable wq_app_group(void);
+
+// Asks for a sandbox extension covering path (once per path). Returns YES
+// when one is held for it.
+BOOL wq_grant(NSString *path);
+
+// Directory listing; asks for access when the plain call is refused.
+NSArray<NSString *> *_Nullable wq_list(NSString *dir, NSString *_Nullable *_Nullable errorText);
+
+// Reads a whole file (up to maxBytes; 0 = no limit).
+NSData *_Nullable wq_read(NSString *path, NSUInteger maxBytes, NSString *_Nullable *_Nullable errorText);
+
+// A file's identity, size and change timestamps, for optimistic concurrency.
+NSDictionary<NSString *, NSNumber *> *_Nullable wq_file_version(NSString *path);
+
+// Overwrites a file in place (same inode, owner and xattrs). The previous
+// contents are backed up first, and a failed write attempts to roll back.
+// Mutation/backup/rollback use one verified regular-file descriptor and an
+// advisory lock where supported. The _if_unchanged forms reject a stale expected
+// version before mutation; nil keeps the legacy unconditional behavior. This is
+// not an atomic transaction against uncooperative external writers or crashes.
+// Backup-storage files cannot be overwritten/deleted through these generic APIs.
+BOOL wq_write(NSString *path, NSData *data, NSString *_Nullable *_Nullable errorText);
+BOOL wq_write_if_unchanged(NSString *path, NSData *data, NSDictionary<NSString *, NSNumber *> *_Nullable expected,
+                           NSString *_Nullable *_Nullable errorText);
+// Verifies saved bytes against the intended contents while the descriptor stays
+// locked, returning that descriptor's version (never a later pathname sample).
+// The returned snapshot still detects later external changes on the next save.
+BOOL wq_write_if_unchanged_get_version(NSString *path, NSData *data,
+    NSDictionary<NSString *, NSNumber *> *_Nullable expected,
+    NSDictionary<NSString *, NSNumber *> *_Nullable *_Nullable savedVersion,
+    NSString *_Nullable *_Nullable errorText);
+
+// Same as wq_write / wq_create_file, but streamed from a local file (for large
+// files; nothing is held in memory). A failed create leaves no partial file.
+BOOL wq_write_from_file(NSString *path, NSString *source, NSString *_Nullable *_Nullable errorText);
+// As wq_write_from_file; *backupUnit gets the backup folder (Backups/<stamp>)
+// holding the previous contents, so a caller may remove it after success.
+BOOL wq_write_from_file_with_backup(NSString *path, NSString *source, NSString *_Nullable *_Nullable backupUnit,
+                                    NSString *_Nullable *_Nullable errorText);
+BOOL wq_create_file_from(NSString *path, NSString *source, NSString *_Nullable *_Nullable errorText);
+// Streams a regular file into a staged local path, then replaces the destination.
+// Same-file aliases are refused; failed streaming leaves the destination intact.
+BOOL wq_copy_to_local(NSString *path, NSString *dest, NSString *_Nullable *_Nullable errorText);
+
+// When Unix permissions (not the sandbox) keep this app out of `path`: an
+// explanation for the user; nil if the owner and mode allow it.
+NSString *_Nullable wq_permission_hint(NSString *path, BOOL forWriting);
+
+// Reads `length` bytes at `offset` (fewer at the end of the file).
+NSData *_Nullable wq_read_range(NSString *path, unsigned long long offset, NSUInteger length,
+                                NSString *_Nullable *_Nullable errorText);
+// Overwrites bytes in place: offset -> replacement bytes. The file keeps its
+// size; it is backed up first, and flush/close errors are reported.
+BOOL wq_patch(NSString *path, NSDictionary<NSNumber *, NSData *> *runs, NSString *_Nullable *_Nullable errorText);
+BOOL wq_patch_if_unchanged(NSString *path, NSDictionary<NSNumber *, NSData *> *runs,
+                           NSDictionary<NSString *, NSNumber *> *_Nullable expected, NSString *_Nullable *_Nullable errorText);
+BOOL wq_patch_if_unchanged_get_version(NSString *path, NSDictionary<NSNumber *, NSData *> *runs,
+    NSDictionary<NSString *, NSNumber *> *_Nullable expected,
+    NSDictionary<NSString *, NSNumber *> *_Nullable *_Nullable savedVersion,
+    NSString *_Nullable *_Nullable errorText);
+
+// Creates a new file or folder inside dir.
+BOOL wq_create_file(NSString *path, NSData *data, NSString *_Nullable *_Nullable errorText);
+BOOL wq_create_dir(NSString *path, NSString *_Nullable *_Nullable errorText);
+
+// Deletes a file (backed up first) or an empty folder.
+BOOL wq_delete(NSString *path, NSString *_Nullable *_Nullable errorText);
+// YES for a folder that represents one backup unit: a stamp directly under
+// the file backup root, or a bundle/date folder directly under the app backup
+// root. Used by the backup browser's multi-selection.
+BOOL wq_backup_unit_deletable(NSString *path);
+// Explicit, user-confirmed removal of one backup unit. Unlike wq_delete, this
+// is allowed inside a backup store and removes the whole subtree. No safety
+// copy is made.
+BOOL wq_delete_backup(NSString *path, NSString *_Nullable *_Nullable errorText);
+BOOL wq_rename(NSString *path, NSString *newName, NSString *_Nullable *_Nullable errorText);
+// Moves a file or folder into destDir (same volume), keeping its name. Never
+// replaces an existing item; refuses moves into itself and into backups.
+BOOL wq_move(NSString *path, NSString *destDir, NSString *_Nullable *_Nullable errorText);
+// Read-only descriptor for a regular file (asks for access when refused), or -1.
+int wq_open_for_reading(NSString *path);
+
+// lstat with access retry. Returns NO if the item does not exist.
+BOOL wq_stat(NSString *path, struct stat *st);
+
+// Thread-safe cancellation for expensive filesystem scans.
+@interface WQScanCancellation : NSObject
+@property (atomic, readonly, getter=isCancelled) BOOL cancelled;
+- (void)cancel;
+@end
+
+// Discovers direct children of dir by brute-forcing inode numbers with
+// fsgetpath (not sandbox-gated), the way KAMUI/bad_query_list do. Needs no
+// token on dir. maxInode bounds the scan (0 = up to the newest id on the
+// volume); progress is called off the main thread, from several threads.
+// Returns absolute child paths, sorted, or nil on failure/cancellation, including
+// when the dynamic bound cannot be discovered. No implicit fixed-range fallback.
+// With maxInode 0, the App Data, Extensions and Internal Daemons parents are
+// scanned together in one pass, reused for 10 minutes (or until
+// wq_enumerate_invalidate) and saved: later scans only check the ids created
+// since the saved one (a full scan runs weekly). The scan keeps running when
+// its caller cancels; concurrent callers wait for that one scan.
+// Forget the shared container scan (App Data, Extensions, Internal Daemons),
+// so the next wq_enumerate of those scans the ids created since. Call on a
+// user's refresh.
+void wq_enumerate_invalidate(void);
+// NO on iOS 26: there worse_query can't reach System Data, the system groups
+// or the App Groups parent folder (only the individual containers).
+BOOL wq_system_areas_reachable(void);
+NSArray<NSString *> *_Nullable wq_enumerate(NSString *dir, int64_t maxInode,
+                                            WQScanCancellation *_Nullable cancellation,
+                                            void (^_Nullable progress)(int64_t done, int64_t total, NSUInteger found));
+
+typedef NS_ENUM(NSInteger, WQMeasureResult) {
+    WQMeasureResultMissing,
+    WQMeasureResultKnown,
+    WQMeasureResultLimited,
+    WQMeasureResultCancelled,
+};
+
+// Total byte size of regular files below dir. A missing directory is Missing
+// (size 0); an unreadable subtree makes the result Limited instead of silently
+// undercounting. Grants access when the root cannot be listed.
+WQMeasureResult wq_measure_tree(NSString *dir, WQScanCancellation *_Nullable cancellation,
+                                unsigned long long *_Nullable bytes);
+
+// Deletes every item *inside* dir (dir itself stays). No backup — for caches.
+// Adds freed bytes to *freed. A missing dir counts as done; NO if dir cannot
+// be read or listed, ancestry contains links (except canonical /var), the target
+// changes, or some items could not be removed. Child links are not followed.
+BOOL wq_purge_contents(NSString *dir, unsigned long long *freed);
+// Cancellable variant for long cache cleans; returns NO when cancelled.
+BOOL wq_purge_contents_cancellable(NSString *dir, unsigned long long *freed,
+                                   WQScanCancellation *_Nullable cancellation);
+
+// Copies every item inside srcDir into dstDir (replacing same-named items).
+// Each child is staged/flushed before installation; old children survive failed
+// copies. This is not an all-children transaction: callers still own tree rollback.
+// Either side may be another app's container. Returns NO if anything failed.
+BOOL wq_copy_contents(NSString *srcDir, NSString *dstDir, NSString *_Nullable *_Nullable errorText);
+
+// MCM container identifier (bundle or group id) of a container folder.
+NSString *_Nullable wq_container_label(NSString *dir);
+// Extra source for wq_container_label, tried after the identifier attribute and
+// the container-manager table: path (/private/var/...) -> identifier or nil.
+// iOS 26: where a full scan takes far too long, the App Data and Extensions
+// lists come from this provider (the LaunchServices database). storeHint is a
+// database path the scan found, or nil for the remembered one.
+// Full scans (every file id; minutes on a well-used device) only start after
+// `confirm` returns YES; it's called on a background thread with what is being
+// listed, the number of ids and a rough duration. `progress` reports a running
+// full scan and its end (finished = YES). Without these hooks no full scan runs.
+void wq_set_full_scan_ui(BOOL (*_Nullable confirm)(NSString *what, int64_t ids, double seconds),
+                         void (*_Nullable progress)(int64_t done, int64_t total, BOOL finished));
+// Stops the running full scan (the scan window's Stop button).
+void wq_full_scan_stop(void);
+// Whether the last listing failed because a full scan wasn't confirmed.
+BOOL wq_full_scan_was_declined(void);
+void wq_set_container_list_provider(NSArray<NSString *> *_Nullable (*_Nullable provider)(NSString *_Nullable storeHint));
+void wq_set_container_label_resolver(NSString *_Nullable (*_Nullable resolver)(NSString *path));
+
+// Backups of overwritten or deleted files, mirrored by original path.
+NSString *wq_backup_root(void);
+// App backups live in Documents/AppBackups, a sibling of file backups.
+NSString *wq_app_backup_root(void);
+// YES inside either backup store. Generic create/write/delete/rename must be
+// refused there so a backup cannot be recursively backed up or silently
+// turned into a different restore source.
+BOOL wq_is_backup_storage_path(NSString *path);
+NSString *_Nullable wq_backup_original_path(NSString *backupPath);
+
+NS_ASSUME_NONNULL_END

source/hook/src/WQAccessSafety.h

@@ -0,0 +1,323 @@
+// Portable implementation helpers for WQAccess; no privileged access is performed here.
+#ifndef WQ_ACCESS_SAFETY_H
+#define WQ_ACCESS_SAFETY_H
+#import <Foundation/Foundation.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <sys/file.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+static inline BOOL WQSameObject(const struct stat *a, const struct stat *b)
+{
+    return a->st_dev == b->st_dev && a->st_ino == b->st_ino;
+}
+
+// Only Apple's documented /var alias is allowed. Do not standardize away '..'
+// before walking: every actual ancestor must be opened without following links.
+static inline NSString *WQCanonicalVarPath(NSString *path)
+{
+    if ([path isEqualToString:@"/var"] || [path hasPrefix:@"/var/"])
+        return [@"/private" stringByAppendingString:path];
+    return path;
+}
+
+static inline int WQOpenDirectoryNoLinksFlags(NSString *path, int flags)
+{
+    path = WQCanonicalVarPath(path);
+    if (![path hasPrefix:@"/"] || [path rangeOfString:@"\0"].location != NSNotFound) { errno = EINVAL; return -1; }
+    // Ancestors need traversal, not enumeration. A file/folder-specific sandbox
+    // extension need not grant read-directory rights on all container parents.
+    int fd = open("/", O_SEARCH | O_CLOEXEC);
+    if (fd < 0) return -1;
+    for (NSString *part in [path componentsSeparatedByString:@"/"]) {
+        if (!part.length) continue;
+        if ([part isEqualToString:@"."] || [part isEqualToString:@".."]) { close(fd); errno = EINVAL; return -1; }
+        int next = openat(fd, part.fileSystemRepresentation, O_SEARCH | O_NOFOLLOW | O_NONBLOCK | O_CLOEXEC);
+        int err = errno;
+        close(fd);
+        if (next < 0) { errno = err; return -1; }
+        fd = next;
+    }
+    if (flags == O_SEARCH) return fd;
+    int result = openat(fd, ".", flags | O_DIRECTORY | O_NOFOLLOW | O_NONBLOCK | O_CLOEXEC);
+    int err = errno;
+    close(fd);
+    if (result < 0) errno = err;
+    return result;
+}
+
+static inline int WQOpenDirectoryNoLinks(NSString *path)
+{
+    return WQOpenDirectoryNoLinksFlags(path, O_RDONLY);
+}
+
+static inline BOOL WQSyncDirectory(int fd)
+{
+    int readable = openat(fd, ".", O_RDONLY | O_DIRECTORY | O_NOFOLLOW | O_CLOEXEC);
+    if (readable < 0) return NO;
+    BOOL ok = fsync(readable) == 0;
+    int err = errno;
+    if (close(readable) != 0 && ok) { ok = NO; err = errno; }
+    if (!ok) errno = err;
+    return ok;
+}
+
+static inline int WQOpenRegularAt(int parent, const char *name, int flags, mode_t mode)
+{
+    // Never allow truncation before the file type has been verified.
+    if (flags & O_TRUNC) { errno = EINVAL; return -1; }
+    struct stat entry;
+    if (fstatat(parent, name, &entry, AT_SYMLINK_NOFOLLOW) == 0) {
+        if (!S_ISREG(entry.st_mode)) { errno = EINVAL; return -1; }
+    } else if (errno != ENOENT || !(flags & O_CREAT)) return -1;
+    int fd = openat(parent, name, flags | O_NOFOLLOW | O_NONBLOCK | O_CLOEXEC, mode);
+    if (fd < 0) return -1;
+    struct stat st = {0};
+    if (fstat(fd, &st) != 0 || !S_ISREG(st.st_mode)) {
+        int err = errno;
+        if (!S_ISREG(st.st_mode)) err = EINVAL;
+        close(fd); errno = err; return -1;
+    }
+    return fd;
+}
+
+static inline BOOL WQWriteBytes(int fd, NSData *data)
+{
+    const uint8_t *bytes = data.bytes;
+    size_t done = 0;
+    while (done < data.length) {
+        ssize_t n = write(fd, bytes + done, data.length - done);
+        if (n < 0 && errno == EINTR) continue;
+        if (n <= 0) { if (n == 0) errno = EIO; return NO; }
+        done += (size_t)n;
+    }
+    return fsync(fd) == 0;
+}
+
+// A durable intent file precedes the rename. The preserved directory itself is
+// never removed. Recovery accepts only our exact symlink or the original inode.
+//
+// Durability: this runs for every access grant (a Cache Cleaner scan makes
+// over a thousand), so only the marker's contents are flushed. That flush is
+// what recovery relies on: a marker that can't be read while the preserved
+// directory exists must fail closed, so its contents have to reach the disk
+// before Caches is renamed. The directory operations themselves need no flush:
+// after an app crash or kill they are already in place, and APFS commits
+// changes to one directory in order, so a power loss leaves one of the states
+// WQCacheSwapRecover handles.
+static const char *const WQCacheMarker = ".wq-caches-swap.plist";
+static const char *const WQCacheMarkerTemp = ".wq-caches-swap.plist.tmp";
+static const char *const WQCacheSaved = ".wq-caches-preserved";
+
+// An invalid marker means Begin never completed the marker write, so no swap
+// should have started. It is safe to discard only when Caches is still a real
+// directory and no preserved directory exists. Otherwise fail closed.
+static inline BOOL WQCacheInvalidMarkerCanBeDiscarded(int library)
+{
+    struct stat saved, caches;
+    if (fstatat(library, WQCacheSaved, &saved, AT_SYMLINK_NOFOLLOW) == 0) { errno = EEXIST; return NO; }
+    if (errno != ENOENT) return NO;
+    if (fstatat(library, "Caches", &caches, AT_SYMLINK_NOFOLLOW) != 0) return NO;
+    if (!S_ISDIR(caches.st_mode)) { errno = EINVAL; return NO; }
+    if (unlinkat(library, WQCacheMarker, 0) != 0) return NO;
+    return fsync(library) == 0;
+}
+
+static inline BOOL WQCacheSwapRecover(int library)
+{
+    int marker = WQOpenRegularAt(library, WQCacheMarker, O_RDONLY, 0);
+    if (marker < 0) {
+        if (errno != ENOENT) return NO;
+        struct stat saved;
+        if (fstatat(library, WQCacheSaved, &saved, AT_SYMLINK_NOFOLLOW) == 0) { errno = EEXIST; return NO; }
+        return errno == ENOENT;
+    }
+    struct stat ms;
+    if (fstat(marker, &ms) != 0 || ms.st_size <= 0 || ms.st_size > 65536) {
+        close(marker);
+        errno = EINVAL;
+        return WQCacheInvalidMarkerCanBeDiscarded(library);
+    }
+    NSMutableData *data = [NSMutableData dataWithLength:(NSUInteger)ms.st_size];
+    size_t done = 0;
+    while (done < data.length) {
+        ssize_t n = read(marker, (uint8_t *)data.mutableBytes + done, data.length - done);
+        if (n < 0 && errno == EINTR) continue;
+        if (n <= 0) {
+            close(marker);
+            errno = EIO;
+            return WQCacheInvalidMarkerCanBeDiscarded(library);
+        }
+        done += (size_t)n;
+    }
+    close(marker);
+    id record = [NSPropertyListSerialization propertyListWithData:data options:0 format:NULL error:nil];
+    if (![record isKindOfClass:NSDictionary.class] || ![record[@"Format"] isEqual:@1] ||
+        ![record[@"Device"] isKindOfClass:NSNumber.class] || ![record[@"Inode"] isKindOfClass:NSNumber.class] ||
+        ![record[@"Target"] isKindOfClass:NSString.class]) {
+        errno = EINVAL;
+        return WQCacheInvalidMarkerCanBeDiscarded(library);
+    }
+    struct stat original = {0}, current = {0};
+    original.st_dev = [record[@"Device"] intValue];
+    original.st_ino = [record[@"Inode"] unsignedLongLongValue];
+    BOOL savedExists = fstatat(library, WQCacheSaved, &original, AT_SYMLINK_NOFOLLOW) == 0;
+    if (!savedExists && errno != ENOENT) return NO;
+    struct stat expected = {0};
+    expected.st_dev = [record[@"Device"] intValue];
+    expected.st_ino = [record[@"Inode"] unsignedLongLongValue];
+    if (savedExists && (!S_ISDIR(original.st_mode) || !WQSameObject(&original, &expected))) { errno = EINVAL; return NO; }
+    BOOL cachesExists = fstatat(library, "Caches", &current, AT_SYMLINK_NOFOLLOW) == 0;
+    if (!cachesExists && errno != ENOENT) return NO;
+    if (savedExists) {
+        if (cachesExists) {
+            char link[65536];
+            ssize_t n = S_ISLNK(current.st_mode) ? readlinkat(library, "Caches", link, sizeof(link) - 1) : -1;
+            if (n < 0) { errno = EEXIST; return NO; }
+            link[n] = 0;
+            if (![record[@"Target"] isEqualToString:[NSString stringWithUTF8String:link]]) { errno = EEXIST; return NO; }
+            if (unlinkat(library, "Caches", 0) != 0) return NO;
+        }
+        if (renameatx_np(library, WQCacheSaved, library, "Caches", RENAME_EXCL) != 0) return NO;
+    } else if (!cachesExists || !S_ISDIR(current.st_mode) || !WQSameObject(&current, &expected)) {
+        errno = EINVAL; return NO;
+    }
+    return unlinkat(library, WQCacheMarker, 0) == 0;
+}
+
+// Normal startup performs no writes. Only an existing recovery marker or saved
+// directory opens the same cross-process lock used by token issuance.
+static inline BOOL WQRecoverCacheSwapAtPath(NSString *libraryPath)
+{
+    int library = WQOpenDirectoryNoLinks(libraryPath);
+    if (library < 0) return errno == ENOENT;
+    struct stat st;
+    BOOL marker = fstatat(library, WQCacheMarker, &st, AT_SYMLINK_NOFOLLOW) == 0;
+    int markerError = marker ? 0 : errno;
+    BOOL saved = fstatat(library, WQCacheSaved, &st, AT_SYMLINK_NOFOLLOW) == 0;
+    int savedError = saved ? 0 : errno;
+    if ((!marker && markerError != ENOENT) || (!saved && savedError != ENOENT)) { close(library); return NO; }
+    if (!marker && !saved) { close(library); return YES; }
+    int lock = WQOpenRegularAt(library, ".wq-caches-lock", O_RDWR | O_CREAT, 0600);
+    BOOL ok = lock >= 0 && flock(lock, LOCK_EX | LOCK_NB) == 0 && WQCacheSwapRecover(library);
+    int error = errno;
+    if (lock >= 0) close(lock);
+    close(library);
+    if (!ok) errno = error;
+    return ok;
+}
+
+static inline BOOL WQCacheSwapBegin(int library, NSString *target)
+{
+    if (!WQCacheSwapRecover(library)) return NO;
+    struct stat st;
+    if (fstatat(library, "Caches", &st, AT_SYMLINK_NOFOLLOW) != 0) {
+        if (errno != ENOENT || mkdirat(library, "Caches", 0755) != 0 ||
+            fstatat(library, "Caches", &st, AT_SYMLINK_NOFOLLOW) != 0) return NO;
+    }
+    if (!S_ISDIR(st.st_mode)) { errno = EINVAL; return NO; }
+    NSDictionary *record = @{ @"Format": @1, @"Device": @(st.st_dev), @"Inode": @(st.st_ino), @"Target": target };
+    NSData *data = [NSPropertyListSerialization dataWithPropertyList:record format:NSPropertyListBinaryFormat_v1_0 options:0 error:nil];
+    if (!data) { errno = EINVAL; return NO; }
+    // A failed marker write must never leave a partial marker behind: write a
+    // temporary sibling, flush it, then atomically rename it into place.
+    unlinkat(library, WQCacheMarkerTemp, 0);
+    int marker = WQOpenRegularAt(library, WQCacheMarkerTemp, O_WRONLY | O_CREAT | O_EXCL, 0600);
+    if (marker < 0) return NO;
+    BOOL durable = WQWriteBytes(marker, data);   // flushes the marker's contents
+    if (close(marker) != 0) durable = NO;
+    if (!durable) {
+        unlinkat(library, WQCacheMarkerTemp, 0);
+        return NO;
+    }
+    if (renameatx_np(library, WQCacheMarkerTemp, library, WQCacheMarker, RENAME_EXCL) != 0) {
+        unlinkat(library, WQCacheMarkerTemp, 0);
+        return NO;
+    }
+    if (renameatx_np(library, "Caches", library, WQCacheSaved, RENAME_EXCL) != 0) return NO;
+    return symlinkat(target.fileSystemRepresentation, library, "Caches") == 0;
+}
+
+static inline BOOL WQAbsolutePathGrammar(NSString *path)
+{
+    if (![path hasPrefix:@"/"] || path.length < 2 || [path rangeOfString:@"\0"].location != NSNotFound) return NO;
+    NSArray *parts = [path componentsSeparatedByString:@"/"];
+    for (NSUInteger i = 1; i < parts.count; i++) {
+        NSString *part = parts[i];
+        if (!part.length || [part isEqualToString:@"."] || [part isEqualToString:@".."]) return NO;
+    }
+    return YES;
+}
+
+static inline int WQCreateDirectoriesNoLinksMode(NSString *path, mode_t mode)
+{
+    path = WQCanonicalVarPath(path);
+    if (!WQAbsolutePathGrammar(path)) { errno = EINVAL; return -1; }
+    int fd = open("/", O_SEARCH | O_CLOEXEC);
+    if (fd < 0) return -1;
+    for (NSString *part in [path componentsSeparatedByString:@"/"]) {
+        if (!part.length) continue;
+        int next = openat(fd, part.fileSystemRepresentation, O_SEARCH | O_NOFOLLOW | O_NONBLOCK | O_CLOEXEC);
+        if (next < 0 && errno == ENOENT) {
+            if (mkdirat(fd, part.fileSystemRepresentation, mode) != 0 && errno != EEXIST) { int err = errno; close(fd); errno = err; return -1; }
+            if (!WQSyncDirectory(fd)) { int err = errno; close(fd); errno = err; return -1; }
+            next = openat(fd, part.fileSystemRepresentation, O_SEARCH | O_NOFOLLOW | O_NONBLOCK | O_CLOEXEC);
+        }
+        int err = errno;
+        close(fd);
+        if (next < 0) { errno = err; return -1; }
+        fd = next;
+    }
+    int result = openat(fd, ".", O_RDONLY | O_DIRECTORY | O_NOFOLLOW | O_NONBLOCK | O_CLOEXEC);
+    int err = errno;
+    close(fd);
+    if (result < 0) errno = err;
+    return result;
+}
+
+static inline int WQCreateDirectoriesNoLinks(NSString *path)
+{
+    return WQCreateDirectoriesNoLinksMode(path, 0700);
+}
+
+static inline BOOL WQBackupStampValid(NSString *stamp)
+{
+    if (stamp.length < 15) return NO;
+    static NSCache<NSString *, NSNumber *> *cache;
+    static dispatch_once_t once;
+    dispatch_once(&once, ^{
+        cache = [NSCache new];
+        cache.countLimit = 1024;
+    });
+    NSNumber *known = [cache objectForKey:stamp];
+    if (known) return known.boolValue;
+
+    // Recognize the historical second/millisecond stamps and the current
+    // millisecond-counter format. No arbitrary directory can become a restore.
+    NSString *pattern = @"^[0-9]{8}-[0-9]{6}(-[0-9]{3}(-[1-9][0-9]*)?)?$";
+    NSRange match = [stamp rangeOfString:pattern options:NSRegularExpressionSearch];
+    if (match.location != 0 || match.length != stamp.length) return NO;
+    NSArray *parts = [stamp componentsSeparatedByString:@"-"];
+    if (parts.count == 4) {
+        uint64_t number = 0;
+        for (NSUInteger i = 0; i < [parts[3] length]; i++) {
+            unsigned digit = [parts[3] characterAtIndex:i] - '0';
+            if (number > (UINT64_MAX - digit) / 10) return NO;
+            number = number * 10 + digit;
+        }
+    }
+    NSDateFormatter *fmt = [NSDateFormatter new];
+    fmt.locale = [NSLocale localeWithLocaleIdentifier:@"en_US_POSIX"];
+    fmt.calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
+    fmt.timeZone = [NSTimeZone timeZoneForSecondsFromGMT:0];
+    fmt.lenient = NO;
+    fmt.dateFormat = @"yyyyMMdd-HHmmss";
+    NSString *datePart = [stamp substringToIndex:15];
+    NSDate *date = [fmt dateFromString:datePart];
+    BOOL valid = date && [[fmt stringFromDate:date] isEqualToString:datePart];
+    [cache setObject:@(valid) forKey:stamp];
+    return valid;
+}
+#endif

source/hook/src/WQApps.h

@@ -0,0 +1,11 @@
+#import <UIKit/UIKit.h>
+
+// Reapplies the pre-restore safety state after an interrupted restore.
+// Call on the serial I/O queue before presenting the result to the user.
+NSString *_Nullable wq_recover_interrupted_restore(void);
+
+@interface WQAppsViewController : UITableViewController <UISearchResultsUpdating>
+// Opens Apps and, once the list is read, offers to restore this app's backup
+// (from the App Backups long-press menu).
+- (nonnull instancetype)initRestoringBundleID:(nonnull NSString *)bundleID;
+@end

source/hook/src/WQAppsSupport.h

@@ -0,0 +1,431 @@
+#import <Foundation/Foundation.h>
+#import <CoreFoundation/CoreFoundation.h>
+#import <CommonCrypto/CommonDigest.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <string.h>
+#include <stdint.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+// Portable, side-effect-free validation shared by the Apps implementation and
+// its macOS fixture tests. Filesystem agreement is checked by WQApps.m.
+static inline BOOL WQAppsSupportIsBool(id value)
+{
+    return [value isKindOfClass:NSNumber.class] &&
+           CFGetTypeID((__bridge CFTypeRef)value) == CFBooleanGetTypeID();
+}
+
+static inline BOOL WQAppsSupportBundleIDValid(NSString *bundleID)
+{
+    if (![bundleID isKindOfClass:NSString.class] || bundleID.length < 3 || bundleID.length > 255) return NO;
+    if ([bundleID hasPrefix:@"."] || [bundleID hasSuffix:@"."] || [bundleID containsString:@".."]) return NO;
+    static NSCharacterSet *bad;
+    static dispatch_once_t once;
+    dispatch_once(&once, ^{
+        bad = [[NSCharacterSet characterSetWithCharactersInString:
+                @"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789.-_"] invertedSet];
+    });
+    return [bundleID containsString:@"."] && [bundleID rangeOfCharacterFromSet:bad].location == NSNotFound;
+}
+
+static inline BOOL WQAppsSupportIsInteger(id value)
+{
+    if (![value isKindOfClass:NSNumber.class]) return NO;
+    if (CFGetTypeID((__bridge CFTypeRef)value) == CFBooleanGetTypeID()) return NO;
+    const char *type = [(NSNumber *)value objCType];
+    return strcmp(type, @encode(char)) == 0 || strcmp(type, @encode(unsigned char)) == 0 ||
+           strcmp(type, @encode(short)) == 0 || strcmp(type, @encode(unsigned short)) == 0 ||
+           strcmp(type, @encode(int)) == 0 || strcmp(type, @encode(unsigned int)) == 0 ||
+           strcmp(type, @encode(long)) == 0 || strcmp(type, @encode(unsigned long)) == 0 ||
+           strcmp(type, @encode(long long)) == 0 || strcmp(type, @encode(unsigned long long)) == 0;
+}
+
+static inline BOOL WQAppsSupportManifestFailure(NSString **errorOut, NSString *message)
+{
+    if (errorOut) *errorOut = message;
+    return NO;
+}
+
+static inline BOOL WQAppsSupportManifestFields(NSDictionary *manifest, NSString *bundleID,
+                                        NSArray<NSString *> **partsOut, NSString **errorOut)
+{
+    if (![manifest isKindOfClass:NSDictionary.class]) {
+        return WQAppsSupportManifestFailure(errorOut, @"The backup manifest is not a dictionary");
+    }
+    if (!WQAppsSupportIsBool(manifest[@"Complete"]) || ![manifest[@"Complete"] boolValue]) {
+        return WQAppsSupportManifestFailure(errorOut, @"The backup manifest is not marked complete");
+    }
+    if (!WQAppsSupportIsInteger(manifest[@"Format"]) || [manifest[@"Format"] unsignedIntegerValue] != 1) {
+        return WQAppsSupportManifestFailure(errorOut, @"The backup manifest format is unsupported");
+    }
+    if (![manifest[@"BundleID"] isKindOfClass:NSString.class] ||
+        ![(NSString *)manifest[@"BundleID"] length] ||
+        ![(NSString *)manifest[@"BundleID"] isEqualToString:bundleID]) {
+        return WQAppsSupportManifestFailure(errorOut, @"The backup manifest belongs to another app");
+    }
+    if (![manifest[@"Created"] isKindOfClass:NSDate.class]) {
+        return WQAppsSupportManifestFailure(errorOut, @"The backup manifest has no valid creation timestamp");
+    }
+    id reason = manifest[@"Reason"];
+    if (reason && ![reason isKindOfClass:NSString.class]) {
+        return WQAppsSupportManifestFailure(errorOut, @"The backup manifest reason is malformed");
+    }
+    id sequence = manifest[@"Sequence"];
+    if (sequence && (!WQAppsSupportIsInteger(sequence) || [sequence compare:@1] == NSOrderedAscending)) {
+        return WQAppsSupportManifestFailure(errorOut, @"The backup manifest sequence is malformed");
+    }
+    NSArray *parts = manifest[@"Parts"];
+    if (![parts isKindOfClass:NSArray.class]) {
+        return WQAppsSupportManifestFailure(errorOut, @"The backup manifest parts are malformed");
+    }
+    NSSet *allowed = [NSSet setWithObjects:@"Documents", @"Library", nil];
+    NSMutableSet *seen = [NSMutableSet setWithCapacity:parts.count];
+    for (id part in parts) {
+        if (![part isKindOfClass:NSString.class] || ![allowed containsObject:part] || [seen containsObject:part]) {
+            return WQAppsSupportManifestFailure(errorOut, @"The backup manifest contains an invalid or duplicate part");
+        }
+        [seen addObject:part];
+    }
+    NSMutableArray *canonical = [NSMutableArray arrayWithCapacity:seen.count];
+    for (NSString *part in @[@"Documents", @"Library"])
+        if ([seen containsObject:part]) [canonical addObject:part];
+    id hashes = manifest[@"PartHashes"];
+    if (hashes) {
+        if (![hashes isKindOfClass:NSDictionary.class]) {
+            return WQAppsSupportManifestFailure(errorOut, @"The backup manifest hashes are malformed");
+        }
+        NSDictionary *partHashes = hashes;
+        if (![[NSSet setWithArray:partHashes.allKeys] isEqualToSet:seen]) {
+            return WQAppsSupportManifestFailure(errorOut, @"The backup manifest hashes do not match its parts");
+        }
+        for (id key in partHashes) {
+            id hash = partHashes[key];
+            if (![key isKindOfClass:NSString.class] || ![allowed containsObject:key] ||
+                ![hash isKindOfClass:NSString.class] || ![hash length]) {
+                return WQAppsSupportManifestFailure(errorOut, @"The backup manifest has an invalid part hash");
+            }
+        }
+    }
+    if (partsOut) *partsOut = canonical;
+    return YES;
+}
+
+static inline void WQAppsSupportHashU64(CC_SHA256_CTX *ctx, uint64_t value)
+{
+    uint8_t bytes[8];
+    for (NSUInteger i = 0; i < 8; i++) bytes[i] = (uint8_t)(value >> (56 - 8 * i));
+    CC_SHA256_Update(ctx, bytes, (CC_LONG)sizeof(bytes));
+}
+
+static inline void WQAppsSupportHashBlob(CC_SHA256_CTX *ctx, const void *bytes, NSUInteger length)
+{
+    WQAppsSupportHashU64(ctx, (uint64_t)length);
+    if (length) CC_SHA256_Update(ctx, bytes, (CC_LONG)length);
+}
+
+// Deterministic SHA-256 over length-prefixed tree metadata. `includeIdentity`
+// adds inode/mtime/ctime for source-stability checks; the shape variant omits
+// them and is suitable for comparing a source with its copy. A digest keeps
+// memory bounded and makes filenames containing delimiters unambiguous.
+static inline NSString *WQAppsSupportTreeSignature(NSString *path, BOOL includeIdentity,
+                                                   BOOL *exists, NSString **errorOut)
+{
+    struct stat rootStat;
+    if (lstat(path.fileSystemRepresentation, &rootStat) != 0) {
+        if (errno == ENOENT) {
+            if (exists) *exists = NO;
+            return @"<missing>";
+        }
+        if (errorOut) *errorOut = [NSString stringWithFormat:@"Cannot inspect %@", path.lastPathComponent];
+        return nil;
+    }
+    if (!S_ISDIR(rootStat.st_mode)) {
+        if (errorOut) *errorOut = [NSString stringWithFormat:@"%@ is not a directory", path.lastPathComponent];
+        return nil;
+    }
+    NSError *listError = nil;
+    if (![NSFileManager.defaultManager contentsOfDirectoryAtPath:path error:&listError]) {
+        if (errorOut) *errorOut = listError.localizedDescription ?: [NSString stringWithFormat:@"Cannot read %@", path.lastPathComponent];
+        return nil;
+    }
+    if (exists) *exists = YES;
+
+    NSMutableArray<NSString *> *relativePaths = [NSMutableArray new];
+    for (NSString *relative in [NSFileManager.defaultManager enumeratorAtPath:path])
+        [relativePaths addObject:relative];
+    [relativePaths sortUsingSelector:@selector(compare:)];
+
+    CC_SHA256_CTX ctx;
+    CC_SHA256_Init(&ctx);
+    for (NSString *relative in relativePaths) {
+        NSString *item = [path stringByAppendingPathComponent:relative];
+        struct stat itemStat;
+        if (lstat(item.fileSystemRepresentation, &itemStat) != 0) {
+            if (errorOut) *errorOut = [NSString stringWithFormat:@"Cannot inspect %@", relative];
+            return nil;
+        }
+        unsigned type = (unsigned)(itemStat.st_mode & S_IFMT);
+        const char *name = relative.UTF8String;
+        NSUInteger nameLength = name ? strlen(name) : 0;
+        if (!name) {
+            if (errorOut) *errorOut = [NSString stringWithFormat:@"Cannot encode %@", relative];
+            return nil;
+        }
+        uint8_t tag = includeIdentity ? 'I' : 'S';
+        CC_SHA256_Update(&ctx, &tag, 1);
+        WQAppsSupportHashBlob(&ctx, name, nameLength);
+        WQAppsSupportHashU64(&ctx, type);
+        WQAppsSupportHashU64(&ctx, (uint64_t)(itemStat.st_mode & 07777));
+        if (includeIdentity) {
+            WQAppsSupportHashU64(&ctx, (uint64_t)itemStat.st_ino);
+            WQAppsSupportHashU64(&ctx, (uint64_t)itemStat.st_size);
+            WQAppsSupportHashU64(&ctx, (uint64_t)itemStat.st_mtimespec.tv_sec);
+            WQAppsSupportHashU64(&ctx, (uint64_t)itemStat.st_mtimespec.tv_nsec);
+            WQAppsSupportHashU64(&ctx, (uint64_t)itemStat.st_ctimespec.tv_sec);
+            WQAppsSupportHashU64(&ctx, (uint64_t)itemStat.st_ctimespec.tv_nsec);
+        } else if (type == S_IFREG) {
+            WQAppsSupportHashU64(&ctx, (uint64_t)itemStat.st_size);
+        } else if (type == S_IFLNK) {
+            char target[PATH_MAX];
+            ssize_t length = readlink(item.fileSystemRepresentation, target, sizeof(target) - 1);
+            if (length < 0 || length >= (ssize_t)sizeof(target) - 1) {
+                if (errorOut) *errorOut = [NSString stringWithFormat:@"Cannot inspect link %@", relative];
+                return nil;
+            }
+            WQAppsSupportHashBlob(&ctx, target, (NSUInteger)length);
+        }
+    }
+    unsigned char digest[CC_SHA256_DIGEST_LENGTH];
+    CC_SHA256_Final(digest, &ctx);
+    NSMutableString *hex = [NSMutableString stringWithCapacity:CC_SHA256_DIGEST_LENGTH * 2];
+    for (NSUInteger i = 0; i < CC_SHA256_DIGEST_LENGTH; i++) [hex appendFormat:@"%02x", digest[i]];
+    return hex;
+}
+
+// Content-level digest for backup verification: metadata plus every regular
+// file's bytes. Reading is streamed; a file that changes while it is hashed
+// fails with an error rather than producing a torn digest.
+static inline NSString *WQAppsSupportTreeContentSignature(NSString *path, BOOL *exists, NSString **errorOut)
+{
+    struct stat rootStat;
+    if (lstat(path.fileSystemRepresentation, &rootStat) != 0) {
+        if (errno == ENOENT) {
+            if (exists) *exists = NO;
+            return @"<missing>";
+        }
+        if (errorOut) *errorOut = [NSString stringWithFormat:@"Cannot inspect %@", path.lastPathComponent];
+        return nil;
+    }
+    if (!S_ISDIR(rootStat.st_mode)) {
+        if (errorOut) *errorOut = [NSString stringWithFormat:@"%@ is not a directory", path.lastPathComponent];
+        return nil;
+    }
+    NSError *listError = nil;
+    if (![NSFileManager.defaultManager contentsOfDirectoryAtPath:path error:&listError]) {
+        if (errorOut) *errorOut = listError.localizedDescription ?: [NSString stringWithFormat:@"Cannot read %@", path.lastPathComponent];
+        return nil;
+    }
+    if (exists) *exists = YES;
+
+    NSMutableArray<NSString *> *relativePaths = [NSMutableArray new];
+    for (NSString *relative in [NSFileManager.defaultManager enumeratorAtPath:path])
+        [relativePaths addObject:relative];
+    [relativePaths sortUsingSelector:@selector(compare:)];
+
+    CC_SHA256_CTX ctx;
+    CC_SHA256_Init(&ctx);
+    uint8_t buffer[65536];
+    for (NSString *relative in relativePaths) {
+        NSString *item = [path stringByAppendingPathComponent:relative];
+        struct stat itemStat;
+        if (lstat(item.fileSystemRepresentation, &itemStat) != 0) {
+            if (errorOut) *errorOut = [NSString stringWithFormat:@"Cannot inspect %@", relative];
+            return nil;
+        }
+        const char *name = relative.UTF8String;
+        if (!name) {
+            if (errorOut) *errorOut = [NSString stringWithFormat:@"Cannot encode %@", relative];
+            return nil;
+        }
+        uint8_t tag = 'C';
+        CC_SHA256_Update(&ctx, &tag, 1);
+        WQAppsSupportHashBlob(&ctx, name, strlen(name));
+        WQAppsSupportHashU64(&ctx, (uint64_t)(itemStat.st_mode & S_IFMT));
+        WQAppsSupportHashU64(&ctx, (uint64_t)(itemStat.st_mode & 07777));
+        WQAppsSupportHashU64(&ctx, (uint64_t)itemStat.st_size);
+        if (S_ISREG(itemStat.st_mode)) {
+            int fd = open(item.fileSystemRepresentation, O_RDONLY | O_NOFOLLOW | O_CLOEXEC);
+            if (fd < 0) {
+                if (errorOut) *errorOut = [NSString stringWithFormat:@"Cannot read %@", relative];
+                return nil;
+            }
+            struct stat after;
+            BOOL ok = fstat(fd, &after) == 0 && S_ISREG(after.st_mode) &&
+                after.st_dev == itemStat.st_dev && after.st_ino == itemStat.st_ino;
+            for (;;) {
+                if (!ok) break;
+                ssize_t n = read(fd, buffer, sizeof(buffer));
+                if (n < 0) {
+                    if (errno == EINTR) continue;
+                    ok = NO;
+                    break;
+                }
+                if (n == 0) break;
+                CC_SHA256_Update(&ctx, buffer, (CC_LONG)n);
+            }
+            struct stat finalStat;
+            if (ok && (fstat(fd, &finalStat) != 0 ||
+                       finalStat.st_size != itemStat.st_size ||
+                       finalStat.st_mtimespec.tv_sec != itemStat.st_mtimespec.tv_sec ||
+                       finalStat.st_mtimespec.tv_nsec != itemStat.st_mtimespec.tv_nsec ||
+                       finalStat.st_ctimespec.tv_sec != itemStat.st_ctimespec.tv_sec ||
+                       finalStat.st_ctimespec.tv_nsec != itemStat.st_ctimespec.tv_nsec)) ok = NO;
+            int err = errno;
+            close(fd);
+            if (!ok) {
+                if (errorOut) *errorOut = [NSString stringWithFormat:@"%@ changed while it was read", relative];
+                errno = err;
+                return nil;
+            }
+        } else if (S_ISLNK(itemStat.st_mode)) {
+            char target[PATH_MAX];
+            ssize_t length = readlink(item.fileSystemRepresentation, target, sizeof(target) - 1);
+            if (length < 0 || length >= (ssize_t)sizeof(target) - 1) {
+                if (errorOut) *errorOut = [NSString stringWithFormat:@"Cannot inspect link %@", relative];
+                return nil;
+            }
+            WQAppsSupportHashBlob(&ctx, target, (NSUInteger)length);
+        }
+    }
+    unsigned char digest[CC_SHA256_DIGEST_LENGTH];
+    CC_SHA256_Final(digest, &ctx);
+    NSMutableString *hex = [NSMutableString stringWithCapacity:CC_SHA256_DIGEST_LENGTH * 2];
+    for (NSUInteger i = 0; i < CC_SHA256_DIGEST_LENGTH; i++) [hex appendFormat:@"%02x", digest[i]];
+    return hex;
+}
+
+static inline NSUInteger WQAppsSupportBackupSequence(NSString *name)
+{
+    if (![name isKindOfClass:NSString.class] || !name.length) return 0;
+    if ([name hasSuffix:@")"]) {
+        NSRange open = [name rangeOfString:@" (" options:NSBackwardsSearch];
+        if (open.location != NSNotFound && open.location + 3 < name.length) {
+            NSString *digits = [name substringWithRange:NSMakeRange(open.location + 2, name.length - open.location - 3)];
+            NSCharacterSet *nonDigits = [[NSCharacterSet decimalDigitCharacterSet] invertedSet];
+            if (digits.length && [digits rangeOfCharacterFromSet:nonDigits].location == NSNotFound) {
+                NSUInteger sequence = digits.integerValue;
+                if (sequence > 0) return sequence;
+            }
+        }
+    }
+    return 1;
+}
+
+static inline NSComparisonResult WQAppsSupportCompareBackupMetadata(NSDate *dateA, NSUInteger sequenceA, NSString *nameA,
+                                                              NSDate *dateB, NSUInteger sequenceB, NSString *nameB)
+{
+    NSComparisonResult dateOrder = [dateA compare:dateB];
+    if (dateOrder != NSOrderedSame) return dateOrder;
+    if (sequenceA < sequenceB) return NSOrderedAscending;
+    if (sequenceA > sequenceB) return NSOrderedDescending;
+    return [nameA compare:nameB options:NSNumericSearch];
+}
+
+typedef NS_ENUM(NSInteger, WQAppsSupportJournalState) {
+    WQAppsSupportJournalMissing,
+    WQAppsSupportJournalActive,
+    WQAppsSupportJournalCommitted,
+    WQAppsSupportJournalUnknown,
+};
+
+static inline WQAppsSupportJournalState WQAppsSupportJournalStateForDictionary(NSDictionary *journal)
+{
+    if (![journal isKindOfClass:NSDictionary.class]) return WQAppsSupportJournalMissing;
+    id state = journal[@"State"];
+    if (![state isKindOfClass:NSString.class]) return WQAppsSupportJournalUnknown;
+    if ([state isEqualToString:@"Active"]) return WQAppsSupportJournalActive;
+    if ([state isEqualToString:@"Committed"]) return WQAppsSupportJournalCommitted;
+    return WQAppsSupportJournalUnknown;
+}
+
+// A new restore may start only when no recovery is pending. A committed
+// journal is safe to clean up and replace; an Active or unknown journal must
+// be recovered or explicitly discarded first.
+static inline BOOL WQAppsSupportJournalAllowsNewRestore(WQAppsSupportJournalState state, NSString **error)
+{
+    if (state == WQAppsSupportJournalActive) {
+        if (error) *error = @"An interrupted restore is still active. Recover or discard it before starting another restore";
+        return NO;
+    }
+    if (state == WQAppsSupportJournalUnknown) {
+        if (error) *error = @"The existing restore recovery journal has an unknown state";
+        return NO;
+    }
+    return YES;
+}
+
+#pragma mark - Import as Backup
+
+// The folder inside an import that holds Documents and/or Library: the
+// picked folder itself, or the shallowest one below it (a shared backup ZIP
+// or another tool's export usually wraps them in a folder). Several at the
+// same depth are ambiguous.
+static inline NSString *WQAppsSupportImportRoot(NSString *dir, NSString **error)
+{
+    NSFileManager *fm = NSFileManager.defaultManager;
+    NSArray<NSString *> *level = @[dir];
+    for (int depth = 0; depth <= 3 && level.count; depth++) {
+        NSMutableArray<NSString *> *found = [NSMutableArray new], *next = [NSMutableArray new];
+        for (NSString *candidate in level) {
+            BOOL has = NO;
+            for (NSString *part in @[@"Documents", @"Library"]) {
+                struct stat st;
+                if (lstat([candidate stringByAppendingPathComponent:part].fileSystemRepresentation, &st) == 0 && S_ISDIR(st.st_mode))
+                    has = YES;
+            }
+            if (has) { [found addObject:candidate]; continue; }
+            for (NSString *name in [[fm contentsOfDirectoryAtPath:candidate error:nil] sortedArrayUsingSelector:@selector(compare:)]) {
+                if ([name hasPrefix:@"."] || [name isEqualToString:@"__MACOSX"]) continue;
+                NSString *child = [candidate stringByAppendingPathComponent:name];
+                struct stat st;
+                if (lstat(child.fileSystemRepresentation, &st) == 0 && S_ISDIR(st.st_mode)) [next addObject:child];
+            }
+        }
+        if (found.count == 1) return found.firstObject;
+        if (found.count > 1) {
+            NSMutableArray *names = [NSMutableArray new];
+            for (NSString *f in found) [names addObject:[f substringFromIndex:MIN(dir.length + 1, f.length)]];
+            if (error) *error = [NSString stringWithFormat:NSLocalizedString(@"It holds data of several apps (%@). Pick one of these folders instead.", nil),
+                                 [names componentsJoinedByString:@", "]];
+            return nil;
+        }
+        level = next;
+    }
+    if (error) *error = NSLocalizedString(@"No Documents or Library folder was found in it.", nil);
+    return nil;
+}
+
+// The bundle ID the imported data says it belongs to, if it says: a WQ Files
+// backup's checklist or a container's metadata file.
+static inline NSString *WQAppsSupportImportDeclaredBundle(NSString *root)
+{
+    NSDictionary *manifest = [NSDictionary dictionaryWithContentsOfFile:[root stringByAppendingPathComponent:@".wqbackup.plist"]];
+    if ([manifest[@"BundleID"] isKindOfClass:NSString.class]) return manifest[@"BundleID"];
+    NSDictionary *metadata = [NSDictionary dictionaryWithContentsOfFile:
+                              [root stringByAppendingPathComponent:@".com.apple.mobile_container_manager.metadata.plist"]];
+    if ([metadata[@"MCMMetadataIdentifier"] isKindOfClass:NSString.class]) return metadata[@"MCMMetadataIdentifier"];
+    return nil;
+}
+
+// Items next to Documents/Library that an import leaves out.
+static inline NSArray<NSString *> *WQAppsSupportImportIgnored(NSString *root)
+{
+    NSMutableArray *ignored = [NSMutableArray new];
+    for (NSString *name in [[NSFileManager.defaultManager contentsOfDirectoryAtPath:root error:nil] sortedArrayUsingSelector:@selector(compare:)]) {
+        if ([@[@"Documents", @"Library", @".wqbackup.plist", @".com.apple.mobile_container_manager.metadata.plist", @".DS_Store"] containsObject:name]) continue;
+        [ignored addObject:name];
+    }
+    return ignored;
+}

source/hook/src/WQArchive.h

@@ -0,0 +1,58 @@
+//
+//  WQArchive.h
+//  WQ Files
+//
+//  Minimal ZIP writer and reader (stored and deflate, via zlib). Files are
+//  read through a small I/O table, so the same code works on other apps'
+//  containers (through WQAccess) and on plain files in host tests.
+//
+//  Writing: ZIP files up to 4 GB with at most 65535 entries. Reading also
+//  understands ZIP64. Extraction never creates symbolic links, refuses entry
+//  names that would leave the target folder, checks every entry's size and
+//  CRC, and writes only into the (local, empty) folder it is given.
+//
+
+#import <Foundation/Foundation.h>
+#import <sys/stat.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface WQArchiveIO : NSObject
+// lstat-like: does not follow a final symbolic link. NO if missing.
+@property (nonatomic, copy) BOOL (^stat)(NSString *path, struct stat *st);
+// Names of the entries in a folder, or nil.
+@property (nonatomic, copy) NSArray<NSString *> *_Nullable (^list)(NSString *dir);
+// A read-only descriptor for a regular file (not following links), or -1.
+@property (nonatomic, copy) int (^openRead)(NSString *path);
+@end
+
+// Plain POSIX calls; for local files and tests.
+WQArchiveIO *wq_archive_posix_io(void);
+
+typedef BOOL (^WQArchiveCancelled)(void);
+// Bytes read (writing) or written (extracting) so far.
+typedef void (^WQArchiveProgress)(unsigned long long bytes);
+
+// Writes a ZIP of `paths` (files and folders, recursively; each one appears
+// under its own name at the top of the archive) to the new local file
+// `zipPath`. Symbolic links and special files are left out and counted in
+// *skipped. A failed or cancelled write removes zipPath.
+BOOL wq_zip_write(NSArray<NSString *> *paths, NSString *zipPath, WQArchiveIO *io,
+                  WQArchiveCancelled _Nullable cancelled, WQArchiveProgress _Nullable progress,
+                  NSUInteger *_Nullable skipped, NSString *_Nullable *_Nullable errorText);
+
+// Extracts the ZIP at zipPath (read through io) into the existing local folder
+// outDir. Refuses archives that would unpack to more than maxBytes, encrypted
+// entries and unsupported compression. Symbolic links in the archive are left
+// out (counted in *skipped); macOS "__MACOSX" metadata is ignored. On failure
+// outDir may hold a partial result; the caller removes it.
+BOOL wq_zip_extract(NSString *zipPath, NSString *outDir, WQArchiveIO *io, unsigned long long maxBytes,
+                    WQArchiveCancelled _Nullable cancelled, WQArchiveProgress _Nullable progress,
+                    NSUInteger *_Nullable files, NSUInteger *_Nullable skipped,
+                    NSString *_Nullable *_Nullable errorText);
+
+// A safe relative path for an entry name ("a/b/c"; backslashes count as
+// separators), or nil for absolute names, "." / ".." components or empty names.
+NSString *_Nullable wq_zip_safe_entry_path(NSString *name);
+
+NS_ASSUME_NONNULL_END

source/hook/src/WQArchive.m

@@ -0,0 +1,575 @@
+//
+//  WQArchive.m
+//  WQ Files
+//
+
+#import "WQArchive.h"
+#import "WQLocalization.h"
+#import <dirent.h>
+#import <fcntl.h>
+#import <sys/time.h>
+#import <time.h>
+#import <unistd.h>
+#import <zlib.h>
+
+static const size_t kWQZipChunk = 256 * 1024;
+static const uint32_t kWQZipMax32 = 0xFFFFFFFFu;
+
+@implementation WQArchiveIO
+@end
+
+WQArchiveIO *wq_archive_posix_io(void)
+{
+    WQArchiveIO *io = [WQArchiveIO new];
+    io.stat = ^BOOL(NSString *path, struct stat *st) { return lstat(path.fileSystemRepresentation, st) == 0; };
+    io.list = ^NSArray<NSString *> *(NSString *dir) {
+        return [NSFileManager.defaultManager contentsOfDirectoryAtPath:dir error:nil];
+    };
+    io.openRead = ^int(NSString *path) {
+        return open(path.fileSystemRepresentation, O_RDONLY | O_NOFOLLOW | O_CLOEXEC);
+    };
+    return io;
+}
+
+#pragma mark Little-endian helpers
+
+static void wq_put16(NSMutableData *d, uint16_t v) { uint8_t b[2] = { (uint8_t)v, (uint8_t)(v >> 8) }; [d appendBytes:b length:2]; }
+static void wq_put32(NSMutableData *d, uint32_t v)
+{
+    uint8_t b[4] = { (uint8_t)v, (uint8_t)(v >> 8), (uint8_t)(v >> 16), (uint8_t)(v >> 24) };
+    [d appendBytes:b length:4];
+}
+static uint16_t wq_rd16(const uint8_t *p) { return (uint16_t)(p[0] | (p[1] << 8)); }
+static uint32_t wq_rd32(const uint8_t *p) { return (uint32_t)p[0] | ((uint32_t)p[1] << 8) | ((uint32_t)p[2] << 16) | ((uint32_t)p[3] << 24); }
+static uint64_t wq_rd64(const uint8_t *p) { return (uint64_t)wq_rd32(p) | ((uint64_t)wq_rd32(p + 4) << 32); }
+
+static BOOL wq_write_fd(int fd, const void *buf, size_t n)
+{
+    const uint8_t *p = buf;
+    while (n > 0) {
+        ssize_t w = write(fd, p, n);
+        if (w < 0 && errno == EINTR) continue;
+        if (w <= 0) return NO;
+        p += w; n -= (size_t)w;
+    }
+    return YES;
+}
+
+static BOOL wq_pread_all(int fd, void *buf, size_t n, off_t offset)
+{
+    uint8_t *p = buf;
+    while (n > 0) {
+        ssize_t r = pread(fd, p, n, offset);
+        if (r < 0 && errno == EINTR) continue;
+        if (r <= 0) return NO;
+        p += r; n -= (size_t)r; offset += r;
+    }
+    return YES;
+}
+
+static ssize_t wq_read_some(int fd, void *buf, size_t n)
+{
+    for (;;) {
+        ssize_t r = read(fd, buf, n);
+        if (r < 0 && errno == EINTR) continue;
+        return r;
+    }
+}
+
+static void wq_dos_time(time_t t, uint16_t *dosTime, uint16_t *dosDate)
+{
+    struct tm tm;
+    localtime_r(&t, &tm);
+    if (tm.tm_year < 80) { *dosTime = 0; *dosDate = (1 << 5) | 1; return; }   // 1980-01-01
+    if (tm.tm_year > 207) tm.tm_year = 207;
+    *dosTime = (uint16_t)((tm.tm_hour << 11) | (tm.tm_min << 5) | (tm.tm_sec / 2));
+    *dosDate = (uint16_t)(((tm.tm_year - 80) << 9) | ((tm.tm_mon + 1) << 5) | tm.tm_mday);
+}
+
+static time_t wq_from_dos_time(uint16_t dosTime, uint16_t dosDate)
+{
+    struct tm tm = {0};
+    tm.tm_year = ((dosDate >> 9) & 0x7f) + 80;
+    tm.tm_mon = ((dosDate >> 5) & 0x0f) - 1;
+    tm.tm_mday = dosDate & 0x1f;
+    tm.tm_hour = (dosTime >> 11) & 0x1f;
+    tm.tm_min = (dosTime >> 5) & 0x3f;
+    tm.tm_sec = (dosTime & 0x1f) * 2;
+    tm.tm_isdst = -1;
+    if (tm.tm_mon < 0 || tm.tm_mday == 0) return 0;
+    return mktime(&tm);
+}
+
+#pragma mark Writing
+
+@interface WQZipEntry : NSObject
+@property (nonatomic) NSData *name;
+@property (nonatomic) BOOL dir;
+@property (nonatomic) uint16_t method, time, date;
+@property (nonatomic) uint32_t crc, mode;
+@property (nonatomic) uint64_t csize, usize, offset;
+@end
+@implementation WQZipEntry
+@end
+
+typedef struct {
+    int out;
+    uint64_t offset;
+    unsigned long long bytesRead;
+    NSUInteger skipped;
+    NSMutableArray<WQZipEntry *> *entries;
+    WQArchiveIO *io;
+    WQArchiveCancelled cancelled;
+    WQArchiveProgress progress;
+    NSString *error;
+} WQZipWriter;
+
+static BOOL wq_zip_fail(WQZipWriter *w, NSString *message)
+{
+    if (!w->error) w->error = message;
+    return NO;
+}
+
+static BOOL wq_zip_too_big(WQZipWriter *w)
+{
+    return wq_zip_fail(w, WQLocalized(@"The archive would be larger than 4 GB, which isn't supported yet."));
+}
+
+static BOOL wq_zip_local_header(WQZipWriter *w, WQZipEntry *e)
+{
+    if (w->offset >= kWQZipMax32) return wq_zip_too_big(w);
+    if (w->entries.count >= 0xFFFF) return wq_zip_fail(w, WQLocalized(@"Too many items for one ZIP (more than 65535)."));
+    e.offset = w->offset;
+    NSMutableData *h = [NSMutableData dataWithCapacity:30 + e.name.length];
+    wq_put32(h, 0x04034b50);
+    wq_put16(h, 20);               // version needed
+    wq_put16(h, 0x0800);           // UTF-8 names
+    wq_put16(h, e.method);
+    wq_put16(h, e.time);
+    wq_put16(h, e.date);
+    wq_put32(h, 0); wq_put32(h, 0); wq_put32(h, 0);   // crc and sizes, patched later
+    wq_put16(h, (uint16_t)e.name.length);
+    wq_put16(h, 0);
+    [h appendData:e.name];
+    if (!wq_write_fd(w->out, h.bytes, h.length)) return wq_zip_fail(w, @(strerror(errno)));
+    w->offset += h.length;
+    [w->entries addObject:e];
+    return YES;
+}
+
+static BOOL wq_zip_add_file(WQZipWriter *w, NSString *path, NSString *name, const struct stat *st)
+{
+    int in = w->io.openRead(path);
+    if (in < 0) return wq_zip_fail(w, WQLocalizedFormat(@"Can't read %@ (%s)", name, strerror(errno)));
+    WQZipEntry *e = [WQZipEntry new];
+    e.name = [name dataUsingEncoding:NSUTF8StringEncoding];
+    e.method = 8;
+    e.mode = st->st_mode & 0777;
+    uint16_t t, d; wq_dos_time(st->st_mtimespec.tv_sec, &t, &d); e.time = t; e.date = d;
+    if (!wq_zip_local_header(w, e)) { close(in); return NO; }
+
+    z_stream z = {0};
+    if (deflateInit2(&z, Z_DEFAULT_COMPRESSION, Z_DEFLATED, -MAX_WBITS, 8, Z_DEFAULT_STRATEGY) != Z_OK) {
+        close(in); return wq_zip_fail(w, WQLocalized(@"Can't start compression"));
+    }
+    uint8_t *inBuf = malloc(kWQZipChunk), *outBuf = malloc(kWQZipChunk);
+    BOOL ok = inBuf && outBuf;
+    if (!ok) wq_zip_fail(w, WQLocalized(@"Out of memory"));
+    uLong crc = crc32(0, NULL, 0);
+    uint64_t usize = 0, csize = 0;
+    BOOL eof = NO;
+    while (ok && !eof) {
+        if (w->cancelled && w->cancelled()) { ok = wq_zip_fail(w, @"Cancelled"); break; }
+        ssize_t n = wq_read_some(in, inBuf, kWQZipChunk);
+        if (n < 0) { ok = wq_zip_fail(w, WQLocalizedFormat(@"Can't read %@ (%s)", name, strerror(errno))); break; }
+        eof = n == 0;
+        crc = crc32(crc, inBuf, (uInt)n);
+        usize += (uint64_t)n;
+        w->bytesRead += (unsigned long long)n;
+        if (usize >= kWQZipMax32) { ok = wq_zip_too_big(w); break; }
+        z.next_in = inBuf; z.avail_in = (uInt)n;
+        int flush = eof ? Z_FINISH : Z_NO_FLUSH;
+        int rc;
+        do {
+            z.next_out = outBuf; z.avail_out = (uInt)kWQZipChunk;
+            rc = deflate(&z, flush);
+            if (rc == Z_STREAM_ERROR) { ok = wq_zip_fail(w, WQLocalized(@"Compression failed")); break; }
+            size_t have = kWQZipChunk - z.avail_out;
+            if (have && !wq_write_fd(w->out, outBuf, have)) { ok = wq_zip_fail(w, @(strerror(errno))); break; }
+            csize += have;
+        } while (z.avail_out == 0);
+        if (ok && w->progress) w->progress(w->bytesRead);
+    }
+    deflateEnd(&z);
+    free(inBuf); free(outBuf);
+    close(in);
+    if (!ok) return NO;
+    w->offset += csize;
+    if (w->offset >= kWQZipMax32) return wq_zip_too_big(w);
+    e.crc = (uint32_t)crc; e.csize = csize; e.usize = usize;
+    NSMutableData *patch = [NSMutableData dataWithCapacity:12];
+    wq_put32(patch, e.crc); wq_put32(patch, (uint32_t)csize); wq_put32(patch, (uint32_t)usize);
+    if (pwrite(w->out, patch.bytes, 12, (off_t)e.offset + 14) != 12) return wq_zip_fail(w, @(strerror(errno)));
+    return YES;
+}
+
+static BOOL wq_zip_add(WQZipWriter *w, NSString *path, NSString *name, NSUInteger depth)
+{
+    if (w->cancelled && w->cancelled()) return wq_zip_fail(w, @"Cancelled");
+    if (depth > 64) return wq_zip_fail(w, WQLocalized(@"Folders are nested too deeply"));
+    struct stat st;
+    if (!w->io.stat(path, &st)) return wq_zip_fail(w, WQLocalizedFormat(@"Can't read %@ (%s)", name, strerror(errno)));
+    if (S_ISREG(st.st_mode)) return wq_zip_add_file(w, path, name, &st);
+    if (!S_ISDIR(st.st_mode)) { w->skipped++; return YES; }   // links and special files
+    WQZipEntry *e = [WQZipEntry new];
+    e.name = [[name stringByAppendingString:@"/"] dataUsingEncoding:NSUTF8StringEncoding];
+    e.dir = YES;
+    e.mode = st.st_mode & 0777;
+    uint16_t t, d; wq_dos_time(st.st_mtimespec.tv_sec, &t, &d); e.time = t; e.date = d;
+    e.crc = 0;
+    if (!wq_zip_local_header(w, e)) return NO;
+    NSArray<NSString *> *children = w->io.list(path);
+    if (!children) return wq_zip_fail(w, WQLocalizedFormat(@"Can't list %@", name));
+    for (NSString *child in [children sortedArrayUsingSelector:@selector(localizedStandardCompare:)]) {
+        if (!wq_zip_add(w, [path stringByAppendingPathComponent:child], [name stringByAppendingFormat:@"/%@", child], depth + 1))
+            return NO;
+    }
+    return YES;
+}
+
+static BOOL wq_zip_central_directory(WQZipWriter *w)
+{
+    uint64_t cdStart = w->offset;
+    NSMutableData *cd = [NSMutableData new];
+    for (WQZipEntry *e in w->entries) {
+        wq_put32(cd, 0x02014b50);
+        wq_put16(cd, (3 << 8) | 20);   // made by Unix, ZIP 2.0
+        wq_put16(cd, 20);
+        wq_put16(cd, 0x0800);
+        wq_put16(cd, e.method);
+        wq_put16(cd, e.time);
+        wq_put16(cd, e.date);
+        wq_put32(cd, e.crc);
+        wq_put32(cd, (uint32_t)e.csize);
+        wq_put32(cd, (uint32_t)e.usize);
+        wq_put16(cd, (uint16_t)e.name.length);
+        wq_put16(cd, 0); wq_put16(cd, 0); wq_put16(cd, 0); wq_put16(cd, 0);
+        uint32_t type = e.dir ? S_IFDIR : S_IFREG;
+        wq_put32(cd, ((type | e.mode) << 16) | (e.dir ? 0x10 : 0));
+        wq_put32(cd, (uint32_t)e.offset);
+        [cd appendData:e.name];
+    }
+    uint32_t cdLength = (uint32_t)cd.length;
+    if (cdStart + cd.length >= kWQZipMax32) return wq_zip_too_big(w);
+    wq_put32(cd, 0x06054b50);
+    wq_put16(cd, 0); wq_put16(cd, 0);
+    wq_put16(cd, (uint16_t)w->entries.count);
+    wq_put16(cd, (uint16_t)w->entries.count);
+    wq_put32(cd, cdLength);
+    wq_put32(cd, (uint32_t)cdStart);
+    wq_put16(cd, 0);
+    if (!wq_write_fd(w->out, cd.bytes, cd.length)) return wq_zip_fail(w, @(strerror(errno)));
+    return YES;
+}
+
+BOOL wq_zip_write(NSArray<NSString *> *paths, NSString *zipPath, WQArchiveIO *io,
+                  WQArchiveCancelled cancelled, WQArchiveProgress progress,
+                  NSUInteger *skipped, NSString **errorText)
+{
+    if (paths.count == 0) { if (errorText) *errorText = WQLocalized(@"Nothing to compress"); return NO; }
+    int out = open(zipPath.fileSystemRepresentation, O_WRONLY | O_CREAT | O_EXCL | O_NOFOLLOW | O_CLOEXEC, 0644);
+    if (out < 0) { if (errorText) *errorText = @(strerror(errno)); return NO; }
+    NSMutableArray *entries = [NSMutableArray new];
+    NSString *error = nil;
+    WQZipWriter w = { .out = out, .entries = entries, .io = io, .cancelled = cancelled, .progress = progress };
+    BOOL ok = YES;
+    NSMutableSet<NSString *> *topNames = [NSMutableSet new];
+    for (NSString *path in paths) {
+        NSString *name = path.lastPathComponent;
+        if (!name.length || [topNames containsObject:name]) { ok = wq_zip_fail(&w, WQLocalized(@"Two selected items have the same name")); break; }
+        [topNames addObject:name];
+        if (!(ok = wq_zip_add(&w, path, name, 0))) break;
+    }
+    if (ok) ok = wq_zip_central_directory(&w);
+    if (ok && fsync(out) != 0) ok = wq_zip_fail(&w, @(strerror(errno)));
+    error = w.error;
+    if (close(out) != 0 && ok) { ok = NO; error = @(strerror(errno)); }
+    if (!ok) unlink(zipPath.fileSystemRepresentation);
+    if (skipped) *skipped = w.skipped;
+    if (!ok && errorText) *errorText = error ?: WQLocalized(@"Could not create the ZIP");
+    return ok;
+}
+
+#pragma mark Reading
+
+NSString *wq_zip_safe_entry_path(NSString *name)
+{
+    if (!name.length || [name rangeOfString:@"\0"].location != NSNotFound) return nil;
+    NSString *slashed = [name stringByReplacingOccurrencesOfString:@"\\" withString:@"/"];
+    if ([slashed hasPrefix:@"/"]) return nil;
+    if (slashed.length >= 2 && [slashed characterAtIndex:1] == ':') return nil;   // "C:/…"
+    NSMutableArray<NSString *> *parts = [NSMutableArray new];
+    for (NSString *part in [slashed componentsSeparatedByString:@"/"]) {
+        if (!part.length) continue;
+        if ([part isEqualToString:@"."] || [part isEqualToString:@".."]) return nil;
+        if (strlen(part.fileSystemRepresentation ?: "") > 255) return nil;
+        [parts addObject:part];
+    }
+    return parts.count ? [parts componentsJoinedByString:@"/"] : nil;
+}
+
+typedef struct {
+    NSString *name;
+    uint16_t flags, method, time, date, madeBy;
+    uint32_t crc, external;
+    uint64_t csize, usize, offset;
+} WQZipItem;
+
+static NSString *wq_zip_decode_name(const uint8_t *p, uint16_t len, uint16_t flags)
+{
+    NSData *raw = [NSData dataWithBytes:p length:len];
+    NSString *s = [[NSString alloc] initWithData:raw encoding:NSUTF8StringEncoding];
+    if (!s && !(flags & 0x0800))
+        s = [[NSString alloc] initWithData:raw encoding:CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingDOSLatinUS)];
+    return s;
+}
+
+static BOOL wq_zip_read_directory(int fd, uint64_t fileSize, WQZipItem **itemsOut, NSUInteger *countOut, NSString **error)
+{
+    size_t tailLen = (size_t)MIN(fileSize, (uint64_t)(22 + 65535));
+    if (tailLen < 22) { *error = WQLocalized(@"Not a ZIP file"); return NO; }
+    uint8_t *tail = malloc(tailLen);
+    if (!tail || !wq_pread_all(fd, tail, tailLen, (off_t)(fileSize - tailLen))) { free(tail); *error = WQLocalized(@"Can't read the ZIP file"); return NO; }
+    ssize_t eocd = -1;
+    for (ssize_t i = (ssize_t)tailLen - 22; i >= 0; i--) {
+        if (wq_rd32(tail + i) == 0x06054b50) { eocd = i; break; }
+    }
+    if (eocd < 0) { free(tail); *error = WQLocalized(@"Not a ZIP file (no directory found)"); return NO; }
+    uint64_t eocdPos = fileSize - tailLen + (uint64_t)eocd;
+    uint64_t count = wq_rd16(tail + eocd + 10);
+    uint64_t cdSize = wq_rd32(tail + eocd + 12);
+    uint64_t cdOffset = wq_rd32(tail + eocd + 16);
+    free(tail);
+    if ((count == 0xFFFF || cdSize == kWQZipMax32 || cdOffset == kWQZipMax32) && eocdPos >= 20) {
+        uint8_t loc[20], rec[56];
+        if (wq_pread_all(fd, loc, 20, (off_t)(eocdPos - 20)) && wq_rd32(loc) == 0x07064b50) {
+            uint64_t recPos = wq_rd64(loc + 8);
+            if (recPos + 56 <= fileSize && wq_pread_all(fd, rec, 56, (off_t)recPos) && wq_rd32(rec) == 0x06064b50) {
+                count = wq_rd64(rec + 32);
+                cdSize = wq_rd64(rec + 40);
+                cdOffset = wq_rd64(rec + 48);
+            }
+        }
+    }
+    if (cdOffset > fileSize || cdSize > fileSize - cdOffset || cdSize > 256ull * 1024 * 1024 || count > cdSize / 46 + 1) {
+        *error = WQLocalized(@"The ZIP file is damaged (bad directory)");
+        return NO;
+    }
+    uint8_t *cd = malloc(cdSize ? (size_t)cdSize : 1);
+    if (!cd || (cdSize && !wq_pread_all(fd, cd, (size_t)cdSize, (off_t)cdOffset))) { free(cd); *error = WQLocalized(@"Can't read the ZIP directory"); return NO; }
+    WQZipItem *items = calloc((size_t)MAX(count, 1), sizeof(WQZipItem));
+    if (!items) { free(cd); *error = WQLocalized(@"Out of memory"); return NO; }
+    uint64_t pos = 0;
+    NSUInteger n = 0;
+    BOOL ok = YES;
+    for (uint64_t i = 0; i < count; i++) {
+        if (pos + 46 > cdSize || wq_rd32(cd + pos) != 0x02014b50) { ok = NO; break; }
+        const uint8_t *p = cd + pos;
+        uint16_t nameLen = wq_rd16(p + 28), extraLen = wq_rd16(p + 30), commentLen = wq_rd16(p + 32);
+        if (pos + 46 + nameLen + extraLen + commentLen > cdSize) { ok = NO; break; }
+        WQZipItem it = {0};
+        it.madeBy = wq_rd16(p + 4);
+        it.flags = wq_rd16(p + 8);
+        it.method = wq_rd16(p + 10);
+        it.time = wq_rd16(p + 12);
+        it.date = wq_rd16(p + 14);
+        it.crc = wq_rd32(p + 16);
+        it.csize = wq_rd32(p + 20);
+        it.usize = wq_rd32(p + 24);
+        it.external = wq_rd32(p + 38);
+        it.offset = wq_rd32(p + 42);
+        // ZIP64 extra field: the 64-bit values for the fields marked 0xFFFFFFFF, in order.
+        const uint8_t *x = p + 46 + nameLen, *xEnd = x + extraLen;
+        while (x + 4 <= xEnd) {
+            uint16_t xid = wq_rd16(x), xlen = wq_rd16(x + 2);
+            if (x + 4 + xlen > xEnd) break;
+            if (xid == 0x0001) {
+                const uint8_t *v = x + 4, *vEnd = v + xlen;
+                if (it.usize == kWQZipMax32 && v + 8 <= vEnd) { it.usize = wq_rd64(v); v += 8; }
+                if (it.csize == kWQZipMax32 && v + 8 <= vEnd) { it.csize = wq_rd64(v); v += 8; }
+                if (it.offset == kWQZipMax32 && v + 8 <= vEnd) { it.offset = wq_rd64(v); v += 8; }
+            }
+            x += 4 + xlen;
+        }
+        it.name = wq_zip_decode_name(p + 46, nameLen, it.flags);
+        if (!it.name) { ok = NO; break; }
+        items[n] = it;
+        // Keep the name alive inside the C array.
+        CFBridgingRetain(it.name);
+        n++;
+        pos += 46 + nameLen + extraLen + commentLen;
+    }
+    free(cd);
+    if (!ok) {
+        for (NSUInteger i = 0; i < n; i++) CFBridgingRelease((__bridge CFTypeRef)items[i].name);
+        free(items);
+        *error = WQLocalized(@"The ZIP file is damaged (bad entry)");
+        return NO;
+    }
+    *itemsOut = items;
+    *countOut = n;
+    return YES;
+}
+
+static void wq_zip_free_items(WQZipItem *items, NSUInteger n)
+{
+    for (NSUInteger i = 0; i < n; i++) CFBridgingRelease((__bridge CFTypeRef)items[i].name);
+    free(items);
+}
+
+static BOOL wq_zip_extract_entry(int fd, uint64_t fileSize, const WQZipItem *it, int out,
+                                 unsigned long long *written, unsigned long long maxBytes,
+                                 WQArchiveCancelled cancelled, WQArchiveProgress progress, NSString **error)
+{
+    uint8_t lh[30];
+    if (it->offset + 30 > fileSize || !wq_pread_all(fd, lh, 30, (off_t)it->offset) || wq_rd32(lh) != 0x04034b50) {
+        *error = WQLocalized(@"The ZIP file is damaged (bad entry header)"); return NO;
+    }
+    uint64_t dataPos = it->offset + 30 + wq_rd16(lh + 26) + wq_rd16(lh + 28);
+    if (dataPos > fileSize || it->csize > fileSize - dataPos) { *error = WQLocalized(@"The ZIP file is damaged (entry out of range)"); return NO; }
+    uint8_t *inBuf = malloc(kWQZipChunk), *outBuf = malloc(kWQZipChunk);
+    if (!inBuf || !outBuf) { free(inBuf); free(outBuf); *error = WQLocalized(@"Out of memory"); return NO; }
+    z_stream z = {0};
+    BOOL inflating = it->method == 8;
+    if (inflating && inflateInit2(&z, -MAX_WBITS) != Z_OK) { free(inBuf); free(outBuf); *error = WQLocalized(@"Can't start decompression"); return NO; }
+    uLong crc = crc32(0, NULL, 0);
+    uint64_t remaining = it->csize, produced = 0;
+    off_t readPos = (off_t)dataPos;
+    BOOL ok = YES, done = it->usize == 0 && it->csize == 0 && !inflating;
+    while (ok && !done) {
+        if (cancelled && cancelled()) { *error = @"Cancelled"; ok = NO; break; }
+        if (z.avail_in == 0 && remaining > 0) {
+            size_t chunk = (size_t)MIN(remaining, (uint64_t)kWQZipChunk);
+            if (!wq_pread_all(fd, inBuf, chunk, readPos)) { *error = WQLocalized(@"Can't read the ZIP file"); ok = NO; break; }
+            readPos += (off_t)chunk; remaining -= chunk;
+            z.next_in = inBuf; z.avail_in = (uInt)chunk;
+        }
+        const uint8_t *data;
+        size_t have;
+        if (inflating) {
+            z.next_out = outBuf; z.avail_out = (uInt)kWQZipChunk;
+            int rc = inflate(&z, Z_NO_FLUSH);
+            if (rc == Z_STREAM_END) done = YES;
+            else if (rc == Z_BUF_ERROR && z.avail_in == 0 && remaining == 0) {
+                *error = WQLocalized(@"The ZIP file is damaged (data ends early)"); ok = NO; break;
+            } else if (rc != Z_OK && rc != Z_BUF_ERROR) {
+                *error = WQLocalized(@"The ZIP file is damaged (bad compressed data)"); ok = NO; break;
+            }
+            data = outBuf; have = kWQZipChunk - z.avail_out;
+        } else {
+            data = z.next_in; have = z.avail_in;
+            z.avail_in = 0;
+            done = remaining == 0;
+        }
+        produced += have;
+        if (produced > it->usize) { *error = WQLocalized(@"The ZIP file is damaged (entry larger than stated)"); ok = NO; break; }
+        if (*written + have > maxBytes) { *error = WQLocalized(@"Not enough free space to extract this ZIP"); ok = NO; break; }
+        if (have && !wq_write_fd(out, data, have)) { *error = @(strerror(errno)); ok = NO; break; }
+        crc = crc32(crc, data, (uInt)have);
+        *written += have;
+        if (progress && have) progress(*written);
+    }
+    if (inflating) inflateEnd(&z);
+    free(inBuf); free(outBuf);
+    if (ok && (produced != it->usize || (uint32_t)crc != it->crc)) {
+        *error = WQLocalized(@"The ZIP file is damaged (checksum mismatch)"); ok = NO;
+    }
+    return ok;
+}
+
+BOOL wq_zip_extract(NSString *zipPath, NSString *outDir, WQArchiveIO *io, unsigned long long maxBytes,
+                    WQArchiveCancelled cancelled, WQArchiveProgress progress,
+                    NSUInteger *filesOut, NSUInteger *skippedOut, NSString **errorText)
+{
+    NSString *error = nil;
+    int fd = io.openRead(zipPath);
+    if (fd < 0) { if (errorText) *errorText = @(strerror(errno)); return NO; }
+    struct stat st;
+    if (fstat(fd, &st) != 0 || !S_ISREG(st.st_mode)) { close(fd); if (errorText) *errorText = WQLocalized(@"Not a regular file"); return NO; }
+    uint64_t fileSize = (uint64_t)st.st_size;
+    WQZipItem *items = NULL;
+    NSUInteger count = 0;
+    if (!wq_zip_read_directory(fd, fileSize, &items, &count, &error)) {
+        close(fd); if (errorText) *errorText = error; return NO;
+    }
+    // Check everything before writing anything.
+    unsigned long long declared = 0;
+    NSMutableArray<NSString *> *safeNames = [NSMutableArray arrayWithCapacity:count];
+    BOOL ok = YES;
+    for (NSUInteger i = 0; i < count && ok; i++) {
+        WQZipItem *it = &items[i];
+        NSString *safe = wq_zip_safe_entry_path(it->name);
+        if (!safe) {
+            ok = NO; error = WQLocalizedFormat(@"The ZIP contains an unsafe name (%@); nothing was extracted.", it->name);
+            break;
+        }
+        [safeNames addObject:safe];
+        if (it->flags & 0x0001) { ok = NO; error = WQLocalized(@"This ZIP is encrypted, which isn't supported."); break; }
+        BOOL isDir = [it->name hasSuffix:@"/"] || [it->name hasSuffix:@"\\"];
+        if (!isDir && it->method != 0 && it->method != 8) {
+            ok = NO; error = WQLocalizedFormat(@"This ZIP uses a compression method that isn't supported (%u).", it->method);
+            break;
+        }
+        if (it->method == 0 && it->csize != it->usize) { ok = NO; error = WQLocalized(@"The ZIP file is damaged (bad sizes)"); break; }
+        declared += it->usize;
+    }
+    if (ok && declared > maxBytes) { ok = NO; error = WQLocalized(@"Not enough free space to extract this ZIP"); }
+    NSUInteger files = 0, skipped = 0;
+    unsigned long long written = 0;
+    NSFileManager *fm = NSFileManager.defaultManager;
+    for (NSUInteger i = 0; i < count && ok; i++) {
+        WQZipItem *it = &items[i];
+        NSString *rel = safeNames[i];
+        if ([rel isEqualToString:@"__MACOSX"] || [rel hasPrefix:@"__MACOSX/"]) continue;
+        BOOL unixMade = (it->madeBy >> 8) == 3;
+        mode_t mode = unixMade ? (mode_t)(it->external >> 16) : 0;
+        if (unixMade && S_ISLNK(mode)) { skipped++; continue; }
+        BOOL isDir = [it->name hasSuffix:@"/"] || [it->name hasSuffix:@"\\"] || (unixMade && S_ISDIR(mode)) || (it->external & 0x10);
+        NSString *target = [outDir stringByAppendingPathComponent:rel];
+        if (isDir) {
+            if (![fm createDirectoryAtPath:target withIntermediateDirectories:YES attributes:nil error:nil]) {
+                ok = NO; error = WQLocalizedFormat(@"Can't create the folder %@", rel);
+            }
+            continue;
+        }
+        NSString *parent = target.stringByDeletingLastPathComponent;
+        if (![fm createDirectoryAtPath:parent withIntermediateDirectories:YES attributes:nil error:nil]) {
+            ok = NO; error = WQLocalizedFormat(@"Can't create the folder for %@", rel); break;
+        }
+        int out = open(target.fileSystemRepresentation, O_WRONLY | O_CREAT | O_EXCL | O_NOFOLLOW | O_CLOEXEC, 0644);
+        if (out < 0) {
+            ok = NO;
+            error = errno == EEXIST ? WQLocalizedFormat(@"The ZIP contains %@ twice", rel)
+                                    : WQLocalizedFormat(@"Can't create %@ (%s)", rel, strerror(errno));
+            break;
+        }
+        NSString *entryError = nil;
+        ok = wq_zip_extract_entry(fd, fileSize, it, out, &written, maxBytes, cancelled, progress, &entryError);
+        if (ok) {
+            time_t when = wq_from_dos_time(it->time, it->date);
+            if (when > 0) {
+                struct timeval tv[2] = { { when, 0 }, { when, 0 } };
+                futimes(out, tv);
+            }
+        }
+        if (close(out) != 0 && ok) { ok = NO; entryError = @(strerror(errno)); }
+        if (!ok) error = entryError ?: WQLocalized(@"Extraction failed");
+        else files++;
+    }
+    close(fd);
+    wq_zip_free_items(items, count);
+    if (filesOut) *filesOut = files;
+    if (skippedOut) *skippedOut = skipped;
+    if (!ok && errorText) *errorText = error ?: WQLocalized(@"Extraction failed");
+    return ok;
+}

source/hook/src/WQCache.h

@@ -0,0 +1,4 @@
+#import <UIKit/UIKit.h>
+
+@interface WQCacheCleanerViewController : UITableViewController <UISearchResultsUpdating>
+@end

source/hook/src/WQCache.m

@@ -0,0 +1,933 @@
+//
+//  WQCache.m
+//  WQ Files cache cleaner
+//  GPL-3.0-or-later.
+//
+
+#import "WQCache.h"
+#import "WQDir.h"
+#import "WQUI.h"
+#import "WQAccess.h"
+#import "WQLaunchServices.h"
+#import "WQCacheSafety.h"
+
+#import <errno.h>
+#import <sys/stat.h>
+
+#pragma mark - Cache cleaner
+
+static NSString *const kCrashLogsPath =
+    @"/private/var/containers/Shared/SystemGroup/systemgroup.com.apple.osanalytics/Library/Logs/CrashReporter";
+
+@interface WQCacheTargetRecord : NSObject
+@property (nonatomic, copy) NSString *path;
+@property (nonatomic, copy) NSString *relativePath;
+@property (nonatomic) BOOL existed;
+@property (nonatomic) BOOL identityKnown;
+@property (nonatomic) dev_t device;
+@property (nonatomic) ino_t inode;
+@property (nonatomic) mode_t mode;
+@end
+@implementation WQCacheTargetRecord
+@end
+
+@interface WQCacheItem : NSObject
+@property (nonatomic, copy) NSString *name;        // app name or "Crash Logs"
+@property (nonatomic, copy) NSString *bundleID;    // for the icon; nil for logs
+@property (nonatomic, copy) NSArray<NSString *> *targets;  // dirs to purge
+@property (nonatomic) unsigned long long cacheBytes;
+@property (nonatomic) unsigned long long tempBytes;
+@property (nonatomic) BOOL cacheKnown;
+@property (nonatomic) BOOL tempKnown;
+@property (nonatomic) BOOL limited;
+@property (nonatomic) BOOL crashLogs;
+@property (nonatomic, copy) NSString *containerPath;
+@property (nonatomic) BOOL containerIdentityKnown;
+@property (nonatomic) dev_t containerDevice;
+@property (nonatomic) ino_t containerInode;
+@property (nonatomic) mode_t containerMode;
+@property (nonatomic, copy) NSArray<WQCacheTargetRecord *> *targetRecords;
+@property (nonatomic) BOOL selected;
+@property (nonatomic, readonly) unsigned long long bytes;
+@end
+@implementation WQCacheItem
+- (unsigned long long)bytes { return self.cacheBytes + self.tempBytes; }
+@end
+
+static void WQCacheSelectionCategories(NSArray<WQCacheItem *> *items,
+                                       BOOL *hasApps,
+                                       BOOL *hasCrashLogs,
+                                       NSUInteger *appCount)
+{
+    BOOL apps = NO, crashLogs = NO;
+    NSUInteger count = 0;
+    for (WQCacheItem *item in items) {
+        if (item.crashLogs) {
+            crashLogs = YES;
+        } else {
+            apps = YES;
+            count++;
+        }
+    }
+    if (hasApps) *hasApps = apps;
+    if (hasCrashLogs) *hasCrashLogs = crashLogs;
+    if (appCount) *appCount = count;
+}
+
+static NSString *WQCacheConfirmationScope(NSArray<WQCacheItem *> *items)
+{
+    BOOL hasApps = NO, hasCrashLogs = NO;
+    NSUInteger appCount = 0;
+    WQCacheSelectionCategories(items, &hasApps, &hasCrashLogs, &appCount);
+    if (hasApps && hasCrashLogs) {
+        return WQLocalizedFormat(appCount == 1
+                ? @"Delete Library/Caches and tmp for %lu app, plus Crash Logs"
+                : @"Delete Library/Caches and tmp for %lu apps, plus Crash Logs",
+                (unsigned long)appCount);
+    }
+    if (hasApps) {
+        return WQLocalizedFormat(appCount == 1
+                ? @"Delete Library/Caches and tmp for %lu app"
+                : @"Delete Library/Caches and tmp for %lu apps",
+                (unsigned long)appCount);
+    }
+    if (hasCrashLogs) return WQLocalized(@"Delete Crash Logs");
+    return WQLocalized(@"Delete the selected cache targets");
+}
+
+static NSString *WQCacheFooterScope(NSArray<WQCacheItem *> *items)
+{
+    BOOL hasApps = NO, hasCrashLogs = NO;
+    WQCacheSelectionCategories(items, &hasApps, &hasCrashLogs, NULL);
+    if (hasApps && hasCrashLogs) {
+        return WQLocalized(@"Clears each selected app's Library/Caches and tmp, and deletes selected Crash Logs. Apps rebuild their caches as you use them; some keep offline content (music, maps, downloads) there and will download it again. No backup is kept.");
+    }
+    if (hasApps) {
+        return WQLocalized(@"Clears each selected app's Library/Caches and tmp. Apps rebuild their caches as you use them; some keep offline content (music, maps, downloads) there and will download it again. No backup is kept.");
+    }
+    if (hasCrashLogs) return WQLocalized(@"Deletes selected Crash Logs. This cannot be undone. No backup is kept.");
+    return WQLocalized(@"Select app caches or Crash Logs to see the deletion scope. No backup is kept.");
+}
+
+typedef NS_ENUM(NSInteger, WQCacheMeasurementState) {
+    WQCacheMeasurementMissing,
+    WQCacheMeasurementKnown,
+    WQCacheMeasurementLimited,
+    WQCacheMeasurementCancelled,
+};
+
+static WQCacheMeasurementState WQCacheMeasureDirectory(NSString *path,
+                                                        WQScanCancellation *cancellation,
+                                                        unsigned long long *bytes)
+{
+    unsigned long long total = 0;
+    WQMeasureResult result = wq_measure_tree(path, cancellation, &total);
+    switch (result) {
+        case WQMeasureResultMissing:
+            return WQCacheMeasurementMissing;
+        case WQMeasureResultKnown:
+            if (bytes) *bytes = total;
+            return WQCacheMeasurementKnown;
+        case WQMeasureResultCancelled:
+            return WQCacheMeasurementCancelled;
+        case WQMeasureResultLimited:
+            wq_log(@"cache scan: limited tree measurement for %@", path);
+            return WQCacheMeasurementLimited;
+    }
+    return WQCacheMeasurementLimited;
+}
+
+typedef NS_ENUM(NSInteger, WQCachePathState) {
+    WQCachePathMissing,
+    WQCachePathExisting,
+    WQCachePathInaccessible,
+};
+
+static WQCachePathState WQCacheInspectPath(NSString *path, struct stat *st)
+{
+    if (wq_stat(path, st)) return WQCachePathExisting;
+    struct stat direct = {0};
+    if (lstat(path.fileSystemRepresentation, &direct) == 0) {
+        if (st) *st = direct;
+        return WQCachePathExisting;
+    }
+    if (errno == ENOENT || errno == ENOTDIR) return WQCachePathMissing;
+    return WQCachePathInaccessible;
+}
+
+static WQCacheTargetRecord *WQCacheTargetRecordForPath(NSString *path, NSString *relativePath)
+{
+    WQCacheTargetRecord *record = [WQCacheTargetRecord new];
+    record.path = path;
+    record.relativePath = relativePath;
+    struct stat st = {0};
+    WQCachePathState state = WQCacheInspectPath(path, &st);
+    if (state == WQCachePathExisting) {
+        record.existed = YES;
+        record.identityKnown = YES;
+        record.device = st.st_dev;
+        record.inode = st.st_ino;
+        record.mode = st.st_mode & S_IFMT;
+    }
+    return record;
+}
+
+static void WQCacheCaptureContainerIdentity(WQCacheItem *item)
+{
+    struct stat st = {0};
+    if (item.containerPath.length && wq_stat(item.containerPath, &st) && S_ISDIR(st.st_mode)) {
+        item.containerIdentityKnown = YES;
+        item.containerDevice = st.st_dev;
+        item.containerInode = st.st_ino;
+        item.containerMode = st.st_mode & S_IFMT;
+    }
+}
+
+static BOOL WQCacheRecordIdentityMatches(WQCacheTargetRecord *record, NSString **reason)
+{
+    struct stat st = {0};
+    WQCachePathState state = WQCacheInspectPath(record.path, &st);
+    if (!record.existed) {
+        if (state == WQCachePathMissing) return YES;
+        if (reason) *reason = [NSString stringWithFormat:@"%@ appeared after the scan", record.path];
+        return NO;
+    }
+    if (state != WQCachePathExisting || !record.identityKnown ||
+        st.st_dev != record.device || st.st_ino != record.inode ||
+        (st.st_mode & S_IFMT) != record.mode) {
+        if (reason) *reason = [NSString stringWithFormat:@"%@ changed after the scan", record.path];
+        return NO;
+    }
+    return YES;
+}
+
+static BOOL WQCacheCrashPathIsSafe(NSString *path)
+{
+    NSString *expected = [kCrashLogsPath stringByStandardizingPath];
+    return [[path stringByStandardizingPath] isEqualToString:expected] &&
+           WQCacheSafetyHasNoSymlinkAncestry(path, YES) &&
+           [WQCacheSafetyCanonicalPath(path) isEqualToString:expected];
+}
+
+static BOOL WQCacheValidateItem(WQCacheItem *item, NSString **reason)
+{
+    if (item.limited) {
+        if (reason) *reason = WQLocalized(@"the scan had limited access");
+        return NO;
+    }
+    if (item.crashLogs) {
+        if (item.targetRecords.count != 1 || !WQCacheCrashPathIsSafe(item.targets.firstObject)) {
+            if (reason) *reason = WQLocalized(@"the crash-log target is not the expected canonical directory");
+            return NO;
+        }
+        return WQCacheRecordIdentityMatches(item.targetRecords.firstObject, reason);
+    }
+    if (item.targetRecords.count != 2 || item.targets.count != 2 ||
+        ![item.targets[0] isEqualToString:item.targetRecords[0].path] ||
+        ![item.targets[1] isEqualToString:item.targetRecords[1].path]) {
+        if (reason) *reason = WQLocalized(@"the scanned cache targets are incomplete");
+        return NO;
+    }
+    if (!item.containerIdentityKnown || !WQCacheSafetyHasNoSymlinkAncestry(item.containerPath, NO)) {
+        if (reason) *reason = WQLocalized(@"the app container identity or ancestry is unavailable");
+        return NO;
+    }
+    struct stat container = {0};
+    if (WQCacheInspectPath(item.containerPath, &container) != WQCachePathExisting ||
+        !S_ISDIR(container.st_mode) || container.st_dev != item.containerDevice ||
+        container.st_ino != item.containerInode || (container.st_mode & S_IFMT) != item.containerMode) {
+        if (reason) *reason = [NSString stringWithFormat:@"%@ changed after the scan", item.name];
+        return NO;
+    }
+    NSString *label = wq_container_label(item.containerPath);
+    if (!item.bundleID.length || ![label isEqualToString:item.bundleID]) {
+        if (reason) *reason = [NSString stringWithFormat:@"%@ no longer has the scanned container identity", item.name];
+        return NO;
+    }
+    for (WQCacheTargetRecord *record in item.targetRecords) {
+        if (!WQCacheSafetyTargetMatchesContainer(record.path, item.containerPath, record.relativePath)) {
+            if (reason) *reason = [NSString stringWithFormat:@"%@ has unsafe path ancestry", record.path];
+            return NO;
+        }
+        if (!WQCacheRecordIdentityMatches(record, reason)) return NO;
+    }
+    return YES;
+}
+
+// Row: selection circle, icon, name with "cache · temp" below, size in a
+// fixed right-hand column so long names never push it out.
+@interface WQCleanerCell : UITableViewCell
+@property (nonatomic, strong) UIImageView *checkView, *iconView;
+@property (nonatomic, strong) UILabel *nameLabel, *detailLabel, *sizeLabel;
+@end
+
+@implementation WQCleanerCell
+
+- (instancetype)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier
+{
+    if ((self = [super initWithStyle:style reuseIdentifier:reuseIdentifier])) {
+        _checkView = [UIImageView new];
+        _checkView.contentMode = UIViewContentModeScaleAspectFit;
+        _iconView = [UIImageView new];
+        _iconView.contentMode = UIViewContentModeScaleAspectFit;
+        _iconView.layer.cornerRadius = 8;
+        _iconView.layer.cornerCurve = kCACornerCurveContinuous;
+        _iconView.clipsToBounds = YES;
+        _nameLabel = [UILabel new];
+        _nameLabel.font = [UIFont preferredFontForTextStyle:UIFontTextStyleBody];
+        _nameLabel.lineBreakMode = NSLineBreakByTruncatingMiddle;
+        _detailLabel = [UILabel new];
+        _detailLabel.font = [UIFont preferredFontForTextStyle:UIFontTextStyleFootnote];
+        _detailLabel.textColor = UIColor.secondaryLabelColor;
+        _detailLabel.lineBreakMode = NSLineBreakByTruncatingMiddle;
+        _sizeLabel = [UILabel new];
+        _sizeLabel.font = [UIFont monospacedDigitSystemFontOfSize:15 weight:UIFontWeightSemibold];
+        // Trailing edge in both layout directions.
+        _sizeLabel.textAlignment = [UIView userInterfaceLayoutDirectionForSemanticContentAttribute:self.semanticContentAttribute]
+            == UIUserInterfaceLayoutDirectionRightToLeft ? NSTextAlignmentLeft : NSTextAlignmentRight;
+        for (UIView *v in @[_checkView, _iconView, _nameLabel, _detailLabel, _sizeLabel]) {
+            v.translatesAutoresizingMaskIntoConstraints = NO;
+            [self.contentView addSubview:v];
+        }
+        [_sizeLabel setContentCompressionResistancePriority:UILayoutPriorityRequired forAxis:UILayoutConstraintAxisHorizontal];
+        [_sizeLabel setContentHuggingPriority:UILayoutPriorityRequired forAxis:UILayoutConstraintAxisHorizontal];
+        UILayoutGuide *m = self.contentView.layoutMarginsGuide;
+        [NSLayoutConstraint activateConstraints:@[
+            [_checkView.leadingAnchor constraintEqualToAnchor:m.leadingAnchor],
+            [_checkView.centerYAnchor constraintEqualToAnchor:self.contentView.centerYAnchor],
+            [_checkView.widthAnchor constraintEqualToConstant:24],
+            [_checkView.heightAnchor constraintEqualToConstant:24],
+            [_iconView.leadingAnchor constraintEqualToAnchor:_checkView.trailingAnchor constant:12],
+            [_iconView.centerYAnchor constraintEqualToAnchor:self.contentView.centerYAnchor],
+            [_iconView.widthAnchor constraintEqualToConstant:36],
+            [_iconView.heightAnchor constraintEqualToConstant:36],
+            [_sizeLabel.trailingAnchor constraintEqualToAnchor:m.trailingAnchor],
+            [_sizeLabel.centerYAnchor constraintEqualToAnchor:self.contentView.centerYAnchor],
+            [_sizeLabel.widthAnchor constraintGreaterThanOrEqualToConstant:76],
+            [_nameLabel.leadingAnchor constraintEqualToAnchor:_iconView.trailingAnchor constant:12],
+            [_nameLabel.trailingAnchor constraintLessThanOrEqualToAnchor:_sizeLabel.leadingAnchor constant:-8],
+            [_nameLabel.topAnchor constraintEqualToAnchor:self.contentView.topAnchor constant:11],
+            [_detailLabel.leadingAnchor constraintEqualToAnchor:_nameLabel.leadingAnchor],
+            [_detailLabel.trailingAnchor constraintLessThanOrEqualToAnchor:_sizeLabel.leadingAnchor constant:-8],
+            [_detailLabel.topAnchor constraintEqualToAnchor:_nameLabel.bottomAnchor constant:2],
+            [_detailLabel.bottomAnchor constraintEqualToAnchor:self.contentView.bottomAnchor constant:-11],
+        ]];
+    }
+    return self;
+}
+
+@end
+
+// Summary card: reclaimable total, a bar for the selected share, status.
+@interface WQSummaryCell : UITableViewCell
+@property (nonatomic, strong) UILabel *captionLabel, *totalLabel, *statusLabel;
+@property (nonatomic, strong) UIProgressView *bar;
+@property (nonatomic, strong) UIActivityIndicatorView *spinner;
+@end
+
+@implementation WQSummaryCell
+
+- (instancetype)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier
+{
+    if ((self = [super initWithStyle:style reuseIdentifier:reuseIdentifier])) {
+        self.selectionStyle = UITableViewCellSelectionStyleNone;
+        _captionLabel = [UILabel new];
+        _captionLabel.font = [UIFont preferredFontForTextStyle:UIFontTextStyleSubheadline];
+        _captionLabel.textColor = UIColor.secondaryLabelColor;
+        _totalLabel = [UILabel new];
+        _totalLabel.font = [[UIFontMetrics metricsForTextStyle:UIFontTextStyleLargeTitle]
+                            scaledFontForFont:[UIFont systemFontOfSize:34 weight:UIFontWeightBold]];
+        _totalLabel.adjustsFontForContentSizeCategory = YES;
+        _bar = [[UIProgressView alloc] initWithProgressViewStyle:UIProgressViewStyleDefault];
+        _bar.progressTintColor = UIColor.systemBlueColor;
+        _statusLabel = [UILabel new];
+        _statusLabel.font = [UIFont preferredFontForTextStyle:UIFontTextStyleFootnote];
+        _statusLabel.textColor = UIColor.secondaryLabelColor;
+        _statusLabel.numberOfLines = 0;
+        _spinner = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleMedium];
+        _spinner.hidesWhenStopped = YES;
+        UIStackView *captionRow = [[UIStackView alloc] initWithArrangedSubviews:@[_captionLabel, _spinner]];
+        captionRow.spacing = 8;
+        captionRow.alignment = UIStackViewAlignmentCenter;
+        UIStackView *stack = [[UIStackView alloc] initWithArrangedSubviews:@[captionRow, _totalLabel, _bar, _statusLabel]];
+        stack.axis = UILayoutConstraintAxisVertical;
+        stack.spacing = 6;
+        [stack setCustomSpacing:10 afterView:_totalLabel];
+        stack.translatesAutoresizingMaskIntoConstraints = NO;
+        [self.contentView addSubview:stack];
+        UILayoutGuide *m = self.contentView.layoutMarginsGuide;
+        [NSLayoutConstraint activateConstraints:@[
+            [stack.leadingAnchor constraintEqualToAnchor:m.leadingAnchor],
+            [stack.trailingAnchor constraintEqualToAnchor:m.trailingAnchor],
+            [stack.topAnchor constraintEqualToAnchor:self.contentView.topAnchor constant:14],
+            [stack.bottomAnchor constraintEqualToAnchor:self.contentView.bottomAnchor constant:-14],
+        ]];
+    }
+    return self;
+}
+
+@end
+
+@implementation WQCacheCleanerViewController {
+    NSArray<WQCacheItem *> *_items;
+    NSArray<WQCacheItem *> *_visibleItems;
+    NSString *_query;
+    NSString *_status;   // scan / clean progress, nil when idle
+    NSString *_result;   // last clean result
+    BOOL _scanning, _cleaning, _scanLimited, _cleanRequiresRescan;
+    WQScanCancellation *_scanCancellation;
+    WQScanCancellation *_cleanCancellation;
+    NSUInteger _scanGeneration;
+    NSTimeInterval _lastScanFinished;
+}
+
+- (instancetype)init { return [super initWithStyle:UITableViewStyleInsetGrouped]; }
+
+- (void)viewDidLoad
+{
+    [super viewDidLoad];
+    self.title = WQLocalizedNullable(@"Cache Cleaner");
+    self.tableView.tableHeaderView = wq_device_header(self.view.bounds.size.width);
+    UISearchController *search = [[UISearchController alloc] initWithSearchResultsController:nil];
+    search.searchResultsUpdater = self;
+    search.obscuresBackgroundDuringPresentation = NO;
+    search.searchBar.placeholder = WQLocalizedNullable(@"Search apps");
+    self.navigationItem.searchController = search;
+    self.navigationItem.hidesSearchBarWhenScrolling = NO;
+    self.definesPresentationContext = YES;
+    self.refreshControl = [UIRefreshControl new];
+    [self.refreshControl addTarget:self action:@selector(userRefresh) forControlEvents:UIControlEventValueChanged];
+    [self scan];
+}
+
+- (void)viewWillAppear:(BOOL)animated
+{
+    [super viewWillAppear:animated];
+    if (_scanning && _scanCancellation.isCancelled) {
+        [self scan];
+        return;
+    }
+    // The screen is kept between visits: rescan on its own only when the
+    // list is old; pull to refresh rescans any time.
+    if (!_scanning && !_cleaning && _lastScanFinished > 0 &&
+        NSDate.date.timeIntervalSinceReferenceDate - _lastScanFinished > 600.0) {
+        [self scan];
+    }
+}
+
+- (void)viewWillDisappear:(BOOL)animated
+{
+    [super viewWillDisappear:animated];
+    if (_scanning) [_scanCancellation cancel];
+    if (_cleaning) [_cleanCancellation cancel];
+    [self.refreshControl endRefreshing];
+}
+
+- (NSArray<WQCacheItem *> *)visibleItems
+{
+    return _visibleItems ?: @[];
+}
+
+- (void)rebuildVisibleItems
+{
+    if (!_query.length) {
+        _visibleItems = _items;
+        return;
+    }
+    _visibleItems = [_items filteredArrayUsingPredicate:[NSPredicate predicateWithBlock:^BOOL(WQCacheItem *it, NSDictionary *__unused b) {
+        return [it.name localizedCaseInsensitiveContainsString:self->_query] ||
+               (it.bundleID && [it.bundleID localizedCaseInsensitiveContainsString:self->_query]);
+    }]];
+}
+
+- (void)updateSearchResultsForSearchController:(UISearchController *)searchController
+{
+    _query = [searchController.searchBar.text stringByTrimmingCharactersInSet:NSCharacterSet.whitespaceCharacterSet];
+    [self rebuildVisibleItems];
+    [self.tableView reloadData];
+    [self updateButtons];
+}
+
+- (void)setStatus:(NSString *)status
+{
+    _status = status;
+    [self.tableView reloadSections:[NSIndexSet indexSetWithIndex:0] withRowAnimation:UITableViewRowAnimationNone];
+}
+
+- (void)updateButtons
+{
+    if (_scanning) {
+        self.navigationItem.rightBarButtonItems = nil;
+        return;
+    }
+    if (_cleaning) {
+        UIBarButtonItem *stop = [[UIBarButtonItem alloc] initWithTitle:WQLocalizedNullable(@"Stop") style:UIBarButtonItemStylePlain
+                                                                 target:self action:@selector(stopClean)];
+        self.navigationItem.rightBarButtonItems = @[stop];
+        return;
+    }
+    NSUInteger n = 0;
+    for (WQCacheItem *it in _items) if (it.selected) n++;
+    UIBarButtonItem *clean = [[UIBarButtonItem alloc] initWithTitle:WQLocalizedNullable(@"Clean") style:wq_primary_button_style()
+                                                             target:self action:@selector(confirmClean)];
+    clean.enabled = n > 0 && !_cleanRequiresRescan;
+    NSArray *visible = self.visibleItems;
+    BOOL allVisible = visible.count > 0;
+    for (WQCacheItem *it in visible) if (it.limited || !it.selected) { allVisible = NO; break; }
+    __weak typeof(self) weakSelf = self;
+    UIAction *__unused all = [UIAction actionWithTitle:WQLocalizedNullable(@"Select All") image:[UIImage systemImageNamed:@"checkmark.circle"]
+                                   identifier:nil handler:^(UIAction *__unused a) { [weakSelf selectWhere:^BOOL(WQCacheItem *__unused it) { return YES; }]; }];
+    UIAction *none = [UIAction actionWithTitle:WQLocalizedNullable(@"Select None") image:[UIImage systemImageNamed:@"circle"]
+                                    identifier:nil handler:^(UIAction *__unused a) { [weakSelf selectWhere:^BOOL(WQCacheItem *__unused it) { return NO; }]; }];
+    UIAction *large = [UIAction actionWithTitle:WQLocalizedNullable(@"Select Large Caches (50 MB+)") image:[UIImage systemImageNamed:@"arrow.up.circle"]
+                                     identifier:nil handler:^(UIAction *__unused a) {
+        [weakSelf selectWhere:^BOOL(WQCacheItem *__unused it) { return it.bytes >= 50ull * 1000 * 1000; }];
+    }];
+    all.state = allVisible ? UIMenuElementStateOn : UIMenuElementStateOff;
+    UIBarButtonItem *select = [[UIBarButtonItem alloc] initWithTitle:WQLocalizedNullable(@"Select")
+                                                                menu:[UIMenu menuWithChildren:@[all, none, large]]];
+    select.enabled = visible.count > 0;
+    self.navigationItem.rightBarButtonItems = @[clean, select];
+}
+
+// Pull to refresh: rescan the containers instead of reusing the shared scan,
+// and look for the app name database again if it wasn't found before.
+- (void)userRefresh
+{
+    wq_enumerate_invalidate();
+    wq_display_names_reset_miss();
+    [self scan];
+}
+
+- (void)scan
+{
+    [_scanCancellation cancel];
+    WQScanCancellation *cancellation = [WQScanCancellation new];
+    _scanCancellation = cancellation;
+    NSUInteger generation = ++_scanGeneration;
+    _scanning = YES;
+    _scanLimited = NO;
+    _cleanRequiresRescan = NO;
+    _result = nil;
+    [self updateButtons];
+    [self setStatus:WQLocalizedNullable(@"Finding apps…")];
+    dispatch_async(wq_io(), ^{
+        NSMutableArray<WQCacheItem *> *items = [NSMutableArray new];
+        NSMutableArray<NSString *> *emptyRoots = [NSMutableArray new];
+        BOOL scanLimited = NO;
+        NSUInteger failedEnumerations = 0;
+        NSUInteger limitedContainers = 0;
+        NSUInteger limitedMeasurements = 0;
+        NSUInteger missingIdentities = 0;
+        NSArray *roots = @[@"/private/var/mobile/Containers/Data/Application",
+                           @"/private/var/mobile/Containers/Data/PluginKitPlugin"];
+        for (NSString *root in roots) {
+            if (cancellation.isCancelled) return;
+            NSString *kind = [root.lastPathComponent isEqualToString:@"Application"] ? @"apps" : @"extensions";
+            NSArray *containers = wq_enumerate(root, 0, cancellation, ^(int64_t done, int64_t total, NSUInteger __unused f) {
+                dispatch_async(dispatch_get_main_queue(), ^{
+                    if (generation != self->_scanGeneration || cancellation.isCancelled) return;
+                    [self setStatus:WQLocalizedFormat(@"Finding %@… %lld%%", kind, (long long)(done * 100 / total))];
+                });
+            });
+            if (!containers) {
+                if (cancellation.isCancelled) return;
+                scanLimited = YES;
+                failedEnumerations++;
+                wq_log(@"cache scan: %@ container enumeration failed", kind);
+                continue;
+            }
+            if (!cancellation.isCancelled && !wq_display_names_loaded()) {
+            dispatch_async(dispatch_get_main_queue(), ^{
+                if (generation != self->_scanGeneration || cancellation.isCancelled) return;
+                [self setStatus:WQLocalizedNullable(@"Reading app names…")];
+            });
+            wq_load_display_names();
+        }
+            if (!containers.count) [emptyRoots addObject:kind];
+            NSUInteger idx = 0;
+            for (NSString *c in containers) {
+                if (cancellation.isCancelled) return;
+                idx++;
+                if (idx % 10 == 0 || idx == containers.count) {
+                    dispatch_async(dispatch_get_main_queue(), ^{
+                        if (generation != self->_scanGeneration || cancellation.isCancelled) return;
+                        [self setStatus:WQLocalizedFormat(@"Measuring %@ %lu of %lu…", kind,
+                                         (unsigned long)idx, (unsigned long)containers.count)];
+                    });
+                }
+                BOOL safeContainer = WQCacheSafetyHasNoSymlinkAncestry(c, NO);
+                BOOL granted = safeContainer && wq_grant(c);  // one token for the whole container
+                NSString *caches = [c stringByAppendingPathComponent:@"Library/Caches"];
+                NSString *tmp = [c stringByAppendingPathComponent:@"tmp"];
+                unsigned long long cacheBytes = 0, tempBytes = 0;
+                BOOL safeCaches = safeContainer &&
+                    WQCacheSafetyTargetMatchesContainer(caches, c, @"Library/Caches");
+                BOOL safeTmp = safeContainer &&
+                    WQCacheSafetyTargetMatchesContainer(tmp, c, @"tmp");
+                WQCacheMeasurementState cacheState = granted && safeCaches
+                    ? WQCacheMeasureDirectory(caches, cancellation, &cacheBytes)
+                    : WQCacheMeasurementLimited;
+                if (cacheState == WQCacheMeasurementCancelled) return;
+                WQCacheMeasurementState tempState = granted && safeTmp
+                    ? WQCacheMeasureDirectory(tmp, cancellation, &tempBytes)
+                    : WQCacheMeasurementLimited;
+                if (tempState == WQCacheMeasurementCancelled) return;
+                if (!granted || !safeContainer) {
+                    scanLimited = YES;
+                    limitedContainers++;
+                    wq_log(@"cache scan: %@ (%@) %@", c.lastPathComponent, wq_bundle_id_for_container(c) ?: @"unknown app",
+                           safeContainer ? @"refused access" : @"failed the path safety check");
+                }
+                if (cacheState == WQCacheMeasurementLimited || tempState == WQCacheMeasurementLimited) {
+                    scanLimited = YES;
+                    limitedMeasurements++;
+                }
+                BOOL cacheKnown = cacheState != WQCacheMeasurementLimited;
+                BOOL tempKnown = tempState != WQCacheMeasurementLimited;
+                if (cacheKnown && tempKnown && cacheBytes + tempBytes < 64 * 1024) continue;
+                WQCacheItem *item = [WQCacheItem new];
+                NSString *bid = granted ? wq_container_label(c) : nil;
+                item.bundleID = bid;
+                if (bid) (void)wq_app_icon(bid);   // warm the icon off the main thread
+                item.name = wq_display_name(bid) ?: bid ?: c.lastPathComponent;
+                item.targets = @[caches, tmp];
+                item.cacheBytes = cacheBytes;
+                item.tempBytes = tempBytes;
+                item.cacheKnown = cacheKnown;
+                item.tempKnown = tempKnown;
+                item.limited = !cacheKnown || !tempKnown;
+                item.containerPath = c;
+                item.targetRecords = @[
+                    WQCacheTargetRecordForPath(caches, @"Library/Caches"),
+                    WQCacheTargetRecordForPath(tmp, @"tmp"),
+                ];
+                WQCacheCaptureContainerIdentity(item);
+                if (!bid.length || !item.containerIdentityKnown) {
+                    item.limited = YES;
+                    scanLimited = YES;
+                    missingIdentities++;
+                }
+                item.selected = !item.limited;
+                [items addObject:item];
+            }
+        }
+        if (cancellation.isCancelled) return;
+        unsigned long long crash = 0;
+        // Crash logs are in a system group, which worse_query reaches on iOS 27
+        // only. On iOS 26 the section is left out instead of reported as limited.
+        BOOL crashReachable = wq_system_areas_reachable();
+        BOOL safeCrashPath = crashReachable && WQCacheCrashPathIsSafe(kCrashLogsPath);
+        WQCacheMeasurementState crashState = !crashReachable ? WQCacheMeasurementMissing
+            : safeCrashPath ? WQCacheMeasureDirectory(kCrashLogsPath, cancellation, &crash)
+                            : WQCacheMeasurementLimited;
+        if (crashState == WQCacheMeasurementCancelled) return;
+        if (crashState == WQCacheMeasurementLimited) {
+            scanLimited = YES;
+            limitedMeasurements++;
+        }
+        if (crashState == WQCacheMeasurementLimited || crash > 0) {
+            WQCacheItem *logs = [WQCacheItem new];
+            logs.name = WQLocalized(@"Crash Logs");
+            logs.targets = @[kCrashLogsPath];
+            logs.cacheBytes = crash;
+            logs.cacheKnown = crashState != WQCacheMeasurementLimited;
+            logs.crashLogs = YES;
+            logs.limited = crashState == WQCacheMeasurementLimited;
+            logs.targetRecords = @[WQCacheTargetRecordForPath(kCrashLogsPath, nil)];
+            logs.selected = !logs.limited;
+            [items addObject:logs];
+        }
+        [items sortUsingComparator:^NSComparisonResult(WQCacheItem *a, WQCacheItem *b) {
+            return a.bytes > b.bytes ? NSOrderedAscending : (a.bytes < b.bytes ? NSOrderedDescending : NSOrderedSame);
+        }];
+        NSMutableArray<NSString *> *notes = [NSMutableArray new];
+        if (failedEnumerations) {
+            [notes addObject:WQLocalizedFormat(failedEnumerations == 1
+                ? @"%lu container enumeration failed" : @"%lu container enumerations failed",
+                (unsigned long)failedEnumerations)];
+        }
+        if (limitedContainers) {
+            [notes addObject:WQLocalizedFormat(limitedContainers == 1
+                ? @"%lu container had limited access" : @"%lu containers had limited access",
+                (unsigned long)limitedContainers)];
+        }
+        if (limitedMeasurements) {
+            [notes addObject:WQLocalizedFormat(limitedMeasurements == 1
+                ? @"%lu cache tree measurement was limited" : @"%lu cache tree measurements were limited",
+                (unsigned long)limitedMeasurements)];
+        }
+        if (missingIdentities) {
+            [notes addObject:WQLocalizedFormat(missingIdentities == 1
+                ? @"%lu container had no identifier or identity" : @"%lu containers had no identifier or identity",
+                (unsigned long)missingIdentities)];
+        }
+        NSString *note = nil;
+        if (scanLimited) {
+            [notes addObject:WQLocalized(@"limited rows are excluded; the remaining rows can still be cleaned")];
+            note = WQLocalizedFormat(@"Scan incomplete: %@. See Log.", [notes componentsJoinedByString:@"; "]);
+        } else if (emptyRoots.count) {
+            note = WQLocalizedFormat(emptyRoots.count == 1 ? @"No %@ container found." : @"No %@ containers found.",
+                                     [emptyRoots componentsJoinedByString:@" or "]);
+        }
+        dispatch_async(dispatch_get_main_queue(), ^{
+            if (generation != self->_scanGeneration || cancellation.isCancelled) return;
+            self->_items = items;
+            [self rebuildVisibleItems];
+            self->_scanning = NO;
+            self->_scanLimited = scanLimited;
+            self->_status = note;
+            self->_lastScanFinished = NSDate.date.timeIntervalSinceReferenceDate;
+            [self.refreshControl endRefreshing];
+            [self.tableView reloadData];
+            [self updateButtons];
+        });
+    });
+}
+
+#pragma mark Table
+
+- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { return 2; }
+
+- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
+{
+    return section == 0 ? 1 : (NSInteger)self.visibleItems.count;
+}
+
+- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
+{
+    if (section == 0 || !_items.count) return nil;
+    NSUInteger shown = self.visibleItems.count;
+    NSUInteger appCount = 0;
+    for (WQCacheItem *item in _items) if (!item.crashLogs) appCount++;
+    if (!appCount) return WQLocalized(@"Crash Logs");
+    return _query.length ? WQLocalizedFormat(@"%lu of %lu", (unsigned long)shown, (unsigned long)_items.count)
+                         : WQLocalizedFormat(@"%lu apps and extensions", (unsigned long)appCount);
+}
+
+- (NSString *)tableView:(UITableView *)tableView titleForFooterInSection:(NSInteger)section
+{
+    if (section == 0 || !_items.count) return nil;
+    NSArray<WQCacheItem *> *selected = [_items filteredArrayUsingPredicate:
+        [NSPredicate predicateWithFormat:@"selected == YES"]];
+    return [WQCacheFooterScope(selected) stringByAppendingString:WQLocalized(@" Close running apps first.")];
+}
+
+- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
+{
+    if (indexPath.section == 0) {
+        WQSummaryCell *cell = [tableView dequeueReusableCellWithIdentifier:@"summary"]
+            ?: [[WQSummaryCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"summary"];
+        unsigned long long total = 0, selected = 0;
+        NSUInteger n = 0;
+        for (WQCacheItem *it in _items) { total += it.bytes; if (it.selected) { selected += it.bytes; n++; } }
+        BOOL busy = _scanning || _cleaning;
+        cell.captionLabel.text = busy ? (_cleaning ? WQLocalized(@"Cleaning") : WQLocalized(@"Scanning")) : WQLocalized(@"Reclaimable");
+        if (busy) [cell.spinner startAnimating]; else [cell.spinner stopAnimating];
+        cell.totalLabel.text = (_scanning && !_items.count) ? @"–" : wq_size_text(total);
+        cell.bar.progress = total ? (float)((double)selected / (double)total) : 0;
+        cell.bar.hidden = _scanning && !_items.count;
+        cell.statusLabel.text = _status ?: _result
+            ?: WQLocalizedFormat(n == 1 ? @"%@ selected in %lu item" : @"%@ selected in %lu items",
+                                 wq_size_text(selected), (unsigned long)n);
+        return cell;
+    }
+    WQCleanerCell *cell = [tableView dequeueReusableCellWithIdentifier:@"item"]
+        ?: [[WQCleanerCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"item"];
+    WQCacheItem *item = self.visibleItems[(NSUInteger)indexPath.row];
+    cell.nameLabel.text = item.name;
+    if (item.crashLogs) {
+        cell.detailLabel.text = item.cacheKnown ? WQLocalized(@"Crash Logs · osanalytics") : WQLocalized(@"Crash Logs · access limited");
+    } else {
+        NSString *cache = item.cacheKnown ? wq_size_text(item.cacheBytes) : WQLocalized(@"unknown");
+        NSString *temp = item.tempKnown ? wq_size_text(item.tempBytes) : WQLocalized(@"unknown");
+        cell.detailLabel.text = WQLocalizedFormat(@"cache %@ · temp %@%@", cache, temp,
+                                 item.limited ? WQLocalized(@" · access limited") : @"");
+    }
+    cell.sizeLabel.text = wq_size_text(item.bytes);
+    cell.iconView.image = wq_app_icon(item.bundleID)
+        ?: [UIImage systemImageNamed:item.bundleID ? @"app.dashed" : @"exclamationmark.triangle"];
+    cell.iconView.tintColor = UIColor.secondaryLabelColor;
+    cell.checkView.image = [UIImage systemImageNamed:item.selected ? @"checkmark.circle.fill" : @"circle"];
+    cell.checkView.tintColor = item.selected ? UIColor.systemBlueColor : UIColor.tertiaryLabelColor;
+    return cell;
+}
+
+- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
+{
+    [tableView deselectRowAtIndexPath:indexPath animated:YES];
+    if (indexPath.section == 0 || _scanning || _cleaning) return;
+    WQCacheItem *item = self.visibleItems[(NSUInteger)indexPath.row];
+    if (item.limited) {
+        wq_alert(self, @"Not cleanable",
+                 @"This row has incomplete access or identity information. Scan again while the app is closed, or use its file browser entry to inspect it.");
+        return;
+    }
+    item.selected = !item.selected;
+    [tableView reloadRowsAtIndexPaths:@[indexPath, [NSIndexPath indexPathForRow:0 inSection:0]]
+                     withRowAnimation:UITableViewRowAnimationNone];
+    [self updateButtons];
+}
+
+- (void)openFolder:(NSString *)path title:(NSString *)title
+{
+    [self.navigationController pushViewController:[[WQDirViewController alloc] initWithPath:path title:title] animated:YES];
+}
+
+- (UIContextMenuConfiguration *)tableView:(UITableView *)tableView
+    contextMenuConfigurationForRowAtIndexPath:(NSIndexPath *)indexPath point:(CGPoint)point
+{
+    // Not during a scan or clean: the browser would show a tree that changes underneath it.
+    if (indexPath.section == 0 || _scanning || _cleaning) return nil;
+    WQCacheItem *item = self.visibleItems[(NSUInteger)indexPath.row];
+    __weak typeof(self) weakSelf = self;
+    return [UIContextMenuConfiguration configurationWithIdentifier:nil previewProvider:nil
+                                                    actionProvider:^UIMenu *(NSArray<UIMenuElement *> *__unused suggested) {
+        NSMutableArray *actions = [NSMutableArray new];
+        if (item.crashLogs) {
+            NSString *root = item.targets.firstObject;
+            [actions addObject:[UIAction actionWithTitle:WQLocalizedNullable(@"Show Crash Logs in File Browser") image:[UIImage systemImageNamed:@"folder"]
+                                              identifier:nil handler:^(UIAction *__unused a) { [weakSelf openFolder:root title:WQLocalizedNullable(@"Crash Logs")]; }]];
+        } else {
+            NSString *caches = item.targets[0], *tmp = item.targets[1];
+            [actions addObject:[UIAction actionWithTitle:WQLocalizedNullable(@"Show Caches in File Browser") image:[UIImage systemImageNamed:@"folder"]
+                                              identifier:nil handler:^(UIAction *__unused a) {
+                [weakSelf openFolder:caches title:[item.name stringByAppendingString:WQLocalized(@" · Caches")]];
+            }]];
+            if (item.tempBytes > 0)
+                [actions addObject:[UIAction actionWithTitle:WQLocalizedNullable(@"Show tmp in File Browser") image:[UIImage systemImageNamed:@"folder"]
+                                                  identifier:nil handler:^(UIAction *__unused a) {
+                    [weakSelf openFolder:tmp title:[item.name stringByAppendingString:WQLocalized(@" · tmp")]];
+                }]];
+            [actions addObject:[UIAction actionWithTitle:WQLocalizedNullable(@"Show App Data in File Browser") image:[UIImage systemImageNamed:@"folder.badge.gearshape"]
+                                              identifier:nil handler:^(UIAction *__unused a) {
+                [weakSelf openFolder:caches.stringByDeletingLastPathComponent.stringByDeletingLastPathComponent title:item.name];
+            }]];
+        }
+        return [UIMenu menuWithTitle:item.name children:actions];
+    }];
+}
+
+#pragma mark Actions
+
+// Applies to the rows the current search shows.
+- (void)selectWhere:(BOOL (^)(WQCacheItem *item))rule
+{
+    for (WQCacheItem *it in self.visibleItems) it.selected = !it.limited && rule(it);
+    [self.tableView reloadData];
+    [self updateButtons];
+}
+
+- (void)stopClean
+{
+    [_cleanCancellation cancel];
+    [self setStatus:WQLocalizedNullable(@"Stopping after the current item…")];
+}
+
+- (void)confirmClean
+{
+    if (wq_refuse_if_deleting_off(self)) return;
+    NSMutableArray<WQCacheItem *> *selected = [NSMutableArray new];
+    unsigned long long sel = 0;
+    for (WQCacheItem *item in _items) {
+        if (!item.selected) continue;
+        [selected addObject:item];
+        sel += item.bytes;
+    }
+    if (!selected.count) return;
+    NSString *msg = WQLocalizedFormat(@"%@, about %@? This cannot be undone. Close the selected apps first; you can stop between items.", WQCacheConfirmationScope(selected), wq_size_text(sel));
+    UIAlertController *alert = wq_alert_controller(@"Clean caches?", msg, UIAlertControllerStyleAlert);
+    [alert addAction:wq_alert_action(@"Cancel", UIAlertActionStyleCancel, nil)];
+    [alert addAction:wq_alert_action(@"Clean", UIAlertActionStyleDestructive, ^(UIAlertAction *__unused a) {
+        [self clean];
+    })];
+    [self presentViewController:alert animated:YES completion:nil];
+}
+
+- (void)clean
+{
+    NSArray<WQCacheItem *> *selected = [_items filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"selected == YES"]];
+    WQScanCancellation *cancellation = [WQScanCancellation new];
+    _cleanCancellation = cancellation;
+    _cleaning = YES;
+    [self updateButtons];
+    [self setStatus:WQLocalizedNullable(@"Cleaning…")];
+    dispatch_async(wq_io(), ^{
+        unsigned long long freed = 0;
+        BOOL allOk = YES;
+        BOOL cancelled = NO;
+        NSString *validationFailure = nil;
+        for (WQCacheItem *item in selected) {
+            if (cancellation.isCancelled) { cancelled = YES; break; }
+            NSString *reason = nil;
+            if (!WQCacheValidateItem(item, &reason)) {
+                allOk = NO;
+                validationFailure = validationFailure ?: [NSString stringWithFormat:@"%@ (%@)", item.name, reason ?: @"identity changed"];
+                wq_log(@"clean: refusing %@ because %@", item.name, reason ?: @"identity validation failed");
+            }
+        }
+        if (validationFailure) {
+            dispatch_async(dispatch_get_main_queue(), ^{
+                self->_cleaning = NO;
+                self->_cleanCancellation = nil;
+                self->_scanLimited = YES;
+                self->_cleanRequiresRescan = YES;
+                self->_status = nil;
+                self->_result = WQLocalizedFormat(@"Clean cancelled: %@. Scan again before retrying.", validationFailure);
+                [self.tableView reloadData];
+                [self updateButtons];
+            });
+            return;
+        }
+        NSUInteger i = 0;
+        for (WQCacheItem *item in selected) {
+            if (cancellation.isCancelled) { cancelled = YES; break; }
+            i++;
+            dispatch_async(dispatch_get_main_queue(), ^{
+                [self setStatus:WQLocalizedFormat(@"Cleaning %lu of %lu: %@", (unsigned long)i, (unsigned long)selected.count, item.name)];
+            });
+            for (WQCacheTargetRecord *record in item.targetRecords) {
+                if (cancellation.isCancelled) { cancelled = YES; break; }
+                NSString *reason = nil;
+                if (!WQCacheValidateItem(item, &reason)) {
+                    allOk = NO;
+                    validationFailure = [NSString stringWithFormat:@"%@ (%@)", item.name, reason ?: @"identity changed"];
+                    wq_log(@"clean: stopped before %@ because %@", record.path, reason ?: @"identity validation failed");
+                    break;
+                }
+                if (!wq_purge_contents_cancellable(record.path, &freed, cancellation)) {
+                    allOk = NO;
+                    if (cancellation.isCancelled) { cancelled = YES; break; }
+                }
+            }
+            if (validationFailure || cancelled) break;
+        }
+        wq_log(@"clean: freed %llu bytes, allOk=%d cancelled=%d", freed, allOk, cancelled);
+        dispatch_async(dispatch_get_main_queue(), ^{
+            self->_cleaning = NO;
+            self->_cleanCancellation = nil;
+            if (cancelled) {
+                self->_status = nil;
+                [self scan];
+                self->_result = WQLocalizedFormat(@"Stopped. Freed %@.%@", wq_size_text(freed),
+                                 allOk ? @"" : WQLocalized(@" Some items could not be removed (see Log)."));
+                return;
+            }
+            if (validationFailure) {
+                self->_scanLimited = YES;
+                self->_cleanRequiresRescan = YES;
+                self->_status = nil;
+                self->_result = WQLocalizedFormat(@"Clean stopped: %@. Scan again before retrying.", validationFailure);
+                [self.tableView reloadData];
+                [self updateButtons];
+            } else {
+                self->_status = nil;
+                [self scan];
+                self->_result = WQLocalizedFormat(@"Freed %@.%@", wq_size_text(freed),
+                                 allOk ? @"" : WQLocalized(@" Some items could not be removed (see Log)."));
+            }
+        });
+    });
+}
+
+@end

source/hook/src/WQCacheSafety.h

@@ -0,0 +1,78 @@
+#ifndef WQ_CACHE_SAFETY_H
+#define WQ_CACHE_SAFETY_H
+
+#import <Foundation/Foundation.h>
+#import <errno.h>
+#import <limits.h>
+#import <stdlib.h>
+#import <sys/stat.h>
+
+// Checks every existing component, including the final component when present,
+// without following links. A missing final component is allowed for scan-time
+// snapshots, but a missing ancestor is never accepted.
+static inline BOOL WQCacheSafetyHasNoSymlinkAncestry(NSString *path, BOOL allowMissingFinal)
+{
+    if (!path.isAbsolutePath || !path.length) return NO;
+    NSArray<NSString *> *components = path.pathComponents;
+    if (components.count < 2 || ![components.firstObject isEqualToString:@"/"]) return NO;
+
+    NSString *prefix = @"/";
+    for (NSUInteger i = 1; i < components.count; i++) {
+        if ([components[i] isEqualToString:@"."] || [components[i] isEqualToString:@".."]) return NO;
+        prefix = [prefix stringByAppendingPathComponent:components[i]];
+        struct stat st = {0};
+        if (lstat(prefix.fileSystemRepresentation, &st) != 0) {
+            if (allowMissingFinal && i == components.count - 1 && errno == ENOENT) return YES;
+            return NO;
+        }
+        if (S_ISLNK(st.st_mode)) return NO;
+    }
+    return YES;
+}
+
+// Resolve an existing path with the filesystem's canonical spelling. For a
+// missing final component, resolve its existing parent and append the final
+// component without following it. realpath() is intentional here: on macOS,
+// Foundation may retain /var while the filesystem's no-follow spelling is
+// /private/var.
+static inline NSString *WQCacheSafetyCanonicalPath(NSString *path)
+{
+    NSString *standard = [path stringByStandardizingPath];
+    char resolved[PATH_MAX];
+    if (realpath(standard.fileSystemRepresentation, resolved)) {
+        return [NSString stringWithUTF8String:resolved] ?: standard;
+    }
+
+    NSString *parent = [standard stringByDeletingLastPathComponent];
+    NSString *last = standard.lastPathComponent;
+    if (realpath(parent.fileSystemRepresentation, resolved)) {
+        NSString *resolvedParent = [NSString stringWithUTF8String:resolved];
+        return [resolvedParent stringByAppendingPathComponent:last];
+    }
+    return standard;
+}
+
+// The lexical shape, no-follow ancestry, and canonical shape must all agree.
+// `relativePath` is the expected target below the canonical container.
+static inline BOOL WQCacheSafetyTargetMatchesContainer(NSString *target,
+                                                         NSString *container,
+                                                         NSString *relativePath)
+{
+    if (!relativePath.length || relativePath.isAbsolutePath) return NO;
+    for (NSString *component in relativePath.pathComponents) {
+        if ([component isEqualToString:@"."] || [component isEqualToString:@".."]) return NO;
+    }
+    NSString *lexicalTarget = [target stringByStandardizingPath];
+    NSString *lexicalExpected = [[container stringByAppendingPathComponent:relativePath]
+                                 stringByStandardizingPath];
+    if (![lexicalTarget isEqualToString:lexicalExpected]) return NO;
+    if (!WQCacheSafetyHasNoSymlinkAncestry(target, YES)) return NO;
+    if (!WQCacheSafetyHasNoSymlinkAncestry(container, NO)) return NO;
+
+    NSString *canonicalContainer = WQCacheSafetyCanonicalPath(container);
+    NSString *canonicalTarget = WQCacheSafetyCanonicalPath(target);
+    NSString *canonicalExpected = [canonicalContainer stringByAppendingPathComponent:relativePath];
+    return [canonicalTarget isEqualToString:canonicalExpected];
+}
+
+#endif

source/hook/src/WQCore.h

@@ -0,0 +1,35 @@
+//
+//  WQCore.h
+//  WQ Files
+//
+//  GPL-3.0-or-later.
+//
+
+#import <Foundation/Foundation.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+// Main-thread edit state shared by all three editors. A successful completion
+// clears dirty only when no newer revision was made after beginSave.
+@interface WQEditState : NSObject
+@property (nonatomic, readonly) NSUInteger revision;
+@property (nonatomic, readonly, getter=isDirty) BOOL dirty;
+@property (nonatomic, readonly, getter=isSaving) BOOL saving;
+- (void)noteChange;
+- (NSUInteger)beginSave;
+- (void)finishSave:(BOOL)success revision:(NSUInteger)savedRevision;
+- (void)discard;
+@end
+
+// Parses pairs of ASCII hex digits separated by whitespace. Property-list data
+// may also contain angle brackets; the hex editor does not accept them.
+NSData *_Nullable WQParseHex(NSString *text, BOOL allowAngleBrackets);
+
+// Overflow-safe validation for an in-place patch range.
+BOOL WQPatchRangeValid(unsigned long long offset, NSUInteger length, unsigned long long fileSize);
+
+// Documents and Library are always represented. YES means copy from the
+// backup; NO means deliberately purge the current part during restore.
+NSDictionary<NSString *, NSNumber *> *WQRestorePlan(BOOL hasDocuments, BOOL hasLibrary);
+
+NS_ASSUME_NONNULL_END

source/hook/src/WQCore.m

@@ -0,0 +1,75 @@
+//
+//  WQCore.m
+//  WQ Files
+//
+//  GPL-3.0-or-later.
+//
+
+#import "WQCore.h"
+
+@implementation WQEditState
+
+- (void)noteChange
+{
+    _revision++;
+    _dirty = YES;
+}
+
+- (NSUInteger)beginSave
+{
+    _saving = YES;
+    return _revision;
+}
+
+- (void)finishSave:(BOOL)success revision:(NSUInteger)savedRevision
+{
+    _saving = NO;
+    if (success && _revision == savedRevision) _dirty = NO;
+}
+
+- (void)discard
+{
+    _revision++;
+    _dirty = NO;
+}
+
+@end
+
+static BOOL WQHexValue(unichar c, uint8_t *value)
+{
+    if (c >= '0' && c <= '9') *value = (uint8_t)(c - '0');
+    else if (c >= 'a' && c <= 'f') *value = (uint8_t)(c - 'a' + 10);
+    else if (c >= 'A' && c <= 'F') *value = (uint8_t)(c - 'A' + 10);
+    else return NO;
+    return YES;
+}
+
+NSData *WQParseHex(NSString *text, BOOL allowAngleBrackets)
+{
+    NSMutableData *out = [NSMutableData new];
+    int high = -1;
+    for (NSUInteger i = 0; i < text.length; i++) {
+        unichar c = [text characterAtIndex:i];
+        if ([NSCharacterSet.whitespaceAndNewlineCharacterSet characterIsMember:c] ||
+            (allowAngleBrackets && (c == '<' || c == '>'))) continue;
+        uint8_t value = 0;
+        if (!WQHexValue(c, &value)) return nil;
+        if (high < 0) high = value;
+        else {
+            uint8_t byte = (uint8_t)((high << 4) | value);
+            [out appendBytes:&byte length:1];
+            high = -1;
+        }
+    }
+    return high < 0 ? out : nil;
+}
+
+BOOL WQPatchRangeValid(unsigned long long offset, NSUInteger length, unsigned long long fileSize)
+{
+    return offset <= fileSize && length <= fileSize - offset;
+}
+
+NSDictionary<NSString *, NSNumber *> *WQRestorePlan(BOOL hasDocuments, BOOL hasLibrary)
+{
+    return @{ @"Documents": @(hasDocuments), @"Library": @(hasLibrary) };
+}

source/hook/src/WQDir.h

@@ -0,0 +1,15 @@
+//
+//  WQDir.h
+//  WQ Files folder browser interface
+//
+
+#import <UIKit/UIKit.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface WQDirViewController : UITableViewController <UIDocumentPickerDelegate, UISearchResultsUpdating>
+@property (nonatomic) BOOL readOnly;
+- (instancetype)initWithPath:(NSString *)path title:(NSString *_Nullable)title;
+@end
+
+NS_ASSUME_NONNULL_END

source/hook/src/WQEditing.h

@@ -0,0 +1,20 @@
+//
+//  WQEditing.h
+//  WQ Files
+//
+//  GPL-3.0-or-later.
+//
+
+#import <Foundation/Foundation.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+// Editors implement this so Back, Home and the interactive edge swipe protect
+// unsaved changes. Root plist editors prompt for a dirty document; child
+// plist editors intentionally keep the shared document's edits.
+@protocol WQUnsavedEditing <NSObject>
+- (BOOL)wq_needsLeaveConfirmation;
+- (void)confirmLeaveThen:(void (^)(void))proceed;
+@end
+
+NS_ASSUME_NONNULL_END

source/hook/src/WQHexViewer.h

@@ -0,0 +1,19 @@
+//
+//  WQHexViewer.h
+//  WQ Files
+//
+//  Hex viewer and editor for files of any size: reads in pages on demand,
+//  go to offset, find hex or text, overwrite bytes in place (wq_patch, with a
+//  backup first). Never changes the file's size.
+//
+
+#import <UIKit/UIKit.h>
+#import "WQEditing.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface WQHexViewController : UITableViewController <WQUnsavedEditing>
+- (instancetype)initWithPath:(NSString *)path readOnly:(BOOL)readOnly;
+@end
+
+NS_ASSUME_NONNULL_END

source/hook/src/WQHexViewer.m

@@ -0,0 +1,526 @@
+//
+//  WQHexViewer.m
+//  WQ Files
+//
+//  GPL-3.0-or-later.
+//
+
+#import "WQHexViewer.h"
+#import "WQHexViewerHelpers.h"
+#import "WQAccess.h"
+#import "WQCore.h"
+#import "WQUI.h"
+#import <sys/stat.h>
+
+static const NSUInteger kPageSize = 64 * 1024;
+static const NSUInteger kSearchChunk = 1024 * 1024;
+
+static BOOL wqh_is_visible(UIViewController *host)
+{
+    if (!host.isViewLoaded || !host.view.window) return NO;
+    UINavigationController *navigation = host.navigationController;
+    return !navigation || navigation.visibleViewController == host;
+}
+
+static void wqh_alert(UIViewController *host, NSString *title, NSString *message)
+{
+    dispatch_async(dispatch_get_main_queue(), ^{
+        if (!wqh_is_visible(host)) return;
+        UIViewController *presented = host.presentedViewController;
+        if (presented && ![presented isKindOfClass:UIAlertController.class]) return;
+        void (^present)(void) = ^{
+            if (!wqh_is_visible(host) || host.presentedViewController) return;
+            UIAlertController *a = wq_alert_controller(title, message, UIAlertControllerStyleAlert);
+            [a addAction:wq_alert_action(@"OK", UIAlertActionStyleDefault, nil)];
+            [host presentViewController:a animated:YES completion:nil];
+        };
+        if (presented) [presented dismissViewControllerAnimated:YES completion:present];
+        else present();
+    });
+}
+
+@implementation WQHexViewController {
+    NSString *_path;
+    BOOL _readOnly;
+    unsigned long long _size;
+    NSUInteger _perRow;
+    int _offsetDigits;     // hex digits in the offset column
+    NSCache<NSNumber *, NSData *> *_pages;
+    NSMutableSet<NSNumber *> *_loading;
+    NSMutableDictionary<NSNumber *, NSNumber *> *_edits;   // offset -> new byte
+    WQEditState *_editState;
+    NSDictionary<NSString *, NSNumber *> *_version;
+    unsigned long long _matchOffset;
+    NSUInteger _matchLength;
+    NSData *_lastSearchNeedle;
+    NSUInteger _searchGeneration;
+    NSString *_status;
+    dispatch_queue_t _queue;
+}
+
+- (instancetype)initWithPath:(NSString *)path readOnly:(BOOL)readOnly
+{
+    if ((self = [super initWithStyle:UITableViewStylePlain])) {
+        _path = [path copy];
+        _readOnly = readOnly;
+        _perRow = 8;
+        _offsetDigits = 8;
+        _pages = [NSCache new];
+        _pages.countLimit = 64;   // 4 MB
+        _loading = [NSMutableSet new];
+        _edits = [NSMutableDictionary new];
+        _editState = [WQEditState new];
+        _queue = dispatch_queue_create("wqfiles.hex", DISPATCH_QUEUE_SERIAL);
+        self.title = path.lastPathComponent;
+    }
+    return self;
+}
+
+- (void)viewDidLoad
+{
+    [super viewDidLoad];
+    self.navigationItem.largeTitleDisplayMode = UINavigationItemLargeTitleDisplayModeNever;
+    // Offsets, hex and ASCII columns read left to right in every language
+    // (the rows are forced too, in cellForRow).
+    self.tableView.semanticContentAttribute = UISemanticContentAttributeForceLeftToRight;
+    self.tableView.separatorStyle = UITableViewCellSeparatorStyleNone;
+    self.tableView.rowHeight = 20;
+    __weak typeof(self) weakSelf = self;
+    self.navigationItem.backAction = [UIAction actionWithHandler:^(UIAction *__unused a) { [weakSelf leave]; }];
+    NSString *path = _path;
+    dispatch_async(_queue, ^{
+        struct stat st;
+        BOOL ok = wq_stat(path, &st) && S_ISREG(st.st_mode);
+        NSDictionary *version = ok ? wq_file_version(path) : nil;
+        dispatch_async(dispatch_get_main_queue(), ^{
+            self->_version = version;
+            self->_size = ok ? (unsigned long long)st.st_size : 0;
+            [self layoutColumns];
+            if (wq_permission_hint(path, YES)) self->_readOnly = YES;
+            self->_status = ok ? nil : WQLocalized(@"Cannot open this file.");
+            [self updateBar];
+            [self.tableView reloadData];
+        });
+    });
+    [self updateBar];
+}
+
+- (void)viewDidDisappear:(BOOL)animated
+{
+    [super viewDidDisappear:animated];
+    _searchGeneration++;
+    _lastSearchNeedle = nil;
+    _matchLength = 0;
+    _status = nil;
+}
+
+- (UIFont *)rowFont
+{
+    return [UIFont monospacedSystemFontOfSize:12 weight:UIFontWeightRegular];
+}
+
+// As many bytes per row as fit (in steps of 4), and an offset column only as
+// wide as the file needs.
+- (void)layoutColumns
+{
+    int digits = 4;
+    for (unsigned long long last = _size ? _size - 1 : 0; digits < 16 && (last >> (4 * digits)); digits++) {}
+    CGFloat charWidth = [@"0" sizeWithAttributes:@{ NSFontAttributeName: self.rowFont }].width;
+    CGFloat avail = self.tableView.bounds.size.width - 16;   // 8 pt margins on each side
+    if (charWidth <= 0 || avail <= 0) return;
+    NSInteger chars = (NSInteger)floor(avail / charWidth);
+    // A row is: offset, 2 spaces, "xx " per byte, 1 space, 1 character per byte.
+    NSInteger fit = (chars - digits - 3) / 4;
+    NSUInteger per = (NSUInteger)MAX(4, MIN(32, fit - fit % 4));
+    if (per != _perRow || digits != _offsetDigits) {
+        _perRow = per;
+        _offsetDigits = digits;
+        [self.tableView reloadData];
+    }
+}
+
+- (void)viewWillLayoutSubviews
+{
+    [super viewWillLayoutSubviews];
+    [self layoutColumns];
+}
+
+- (void)updateBar
+{
+    NSString *size = [NSByteCountFormatter stringFromByteCount:(long long)_size countStyle:NSByteCountFormatterCountStyleFile];
+    NSString *prompt = _status ?: WQLocalizedFormat(@"%@ · %llu bytes%@%@", size, _size,
+                                   _edits.count ? WQLocalizedFormat(@" · %lu changed", (unsigned long)_edits.count) : @"",
+                                   _editState.saving ? WQLocalized(@" · Saving…") : @"");
+    self.navigationItem.prompt = prompt;
+    NSMutableArray *items = [NSMutableArray array];
+    if (!_readOnly) {
+        UIBarButtonItem *save = [[UIBarButtonItem alloc] initWithTitle:WQLocalizedNullable(@"Save") style:wq_primary_button_style()
+                                                                target:self action:@selector(save)];
+        save.enabled = _edits.count > 0 && !_editState.saving;
+        [items addObject:save];
+    }
+    __weak typeof(self) weakSelf = self;
+    UIAction *discard = [UIAction actionWithTitle:WQLocalizedNullable(@"Discard Changes") image:[UIImage systemImageNamed:@"arrow.uturn.backward"] identifier:nil
+                                      handler:^(UIAction *__unused a) { [weakSelf discard]; }];
+    if (_editState.saving) discard.attributes = UIMenuElementAttributesDisabled;
+    UIMenu *menu = [UIMenu menuWithChildren:@[
+        [UIAction actionWithTitle:WQLocalizedNullable(@"Go to Offset…") image:[UIImage systemImageNamed:@"arrow.right.to.line"] identifier:nil
+                          handler:^(UIAction *__unused a) { [weakSelf goToOffset]; }],
+        [UIAction actionWithTitle:WQLocalizedNullable(@"Find Hex Bytes…") image:[UIImage systemImageNamed:@"magnifyingglass"] identifier:nil
+                          handler:^(UIAction *__unused a) { [weakSelf promptFindHex:YES]; }],
+        [UIAction actionWithTitle:WQLocalizedNullable(@"Find Text…") image:[UIImage systemImageNamed:@"text.magnifyingglass"] identifier:nil
+                          handler:^(UIAction *__unused a) { [weakSelf promptFindHex:NO]; }],
+        discard,
+    ]];
+    [items addObject:[[UIBarButtonItem alloc] initWithImage:[UIImage systemImageNamed:@"ellipsis.circle"] menu:menu]];
+    self.navigationItem.rightBarButtonItems = items;
+}
+
+#pragma mark Data
+
+// The file byte at `offset` (an edit if there is one), or -1 while its page
+// is still being read.
+- (int)byteAt:(unsigned long long)offset
+{
+    NSNumber *edit = _edits[@(offset)];
+    if (edit) return edit.intValue;
+    return [self originalByteAt:offset];
+}
+
+- (int)originalByteAt:(unsigned long long)offset
+{
+    NSNumber *page = @(offset / kPageSize);
+    NSData *data = [_pages objectForKey:page];
+    if (!data) { [self loadPage:page]; return -1; }
+    NSUInteger i = (NSUInteger)(offset % kPageSize);
+    return i < data.length ? ((const uint8_t *)data.bytes)[i] : -1;
+}
+
+- (void)loadPage:(NSNumber *)page
+{
+    if ([_loading containsObject:page]) return;
+    [_loading addObject:page];
+    NSString *path = _path;
+    dispatch_async(_queue, ^{
+        NSString *error = nil;
+        NSData *data = wq_read_range(path, page.unsignedLongLongValue * kPageSize, kPageSize, &error);
+        dispatch_async(dispatch_get_main_queue(), ^{
+            [self->_loading removeObject:page];
+            if (!data) {
+                self->_status = wq_permission_hint(path, NO) ? WQLocalized(@"Only the owner may read this file.") : WQLocalizedFormat(@"Read failed: %@", error);
+                [self updateBar];
+                return;
+            }
+            [self->_pages setObject:data forKey:page];
+            [self.tableView reloadRowsAtIndexPaths:self.tableView.indexPathsForVisibleRows
+                                  withRowAnimation:UITableViewRowAnimationNone];
+        });
+    });
+}
+
+#pragma mark Table
+
+- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
+{
+    return (NSInteger)((_size + _perRow - 1) / _perRow);
+}
+
+- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
+{
+    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"h"]
+        ?: [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"h"];
+    cell.semanticContentAttribute = UISemanticContentAttributeForceLeftToRight;
+    cell.contentView.semanticContentAttribute = UISemanticContentAttributeForceLeftToRight;
+    UIFont *font = self.rowFont;
+    unsigned long long start = (unsigned long long)indexPath.row * _perRow;
+    NSMutableAttributedString *line = [[NSMutableAttributedString alloc]
+        initWithString:[NSString stringWithFormat:@"%0*llx  ", _offsetDigits, start]
+            attributes:@{ NSFontAttributeName: font, NSForegroundColorAttributeName: UIColor.secondaryLabelColor }];
+    NSMutableString *ascii = [NSMutableString new];
+    NSMutableArray<NSValue *> *asciiMarks = [NSMutableArray new];
+    for (NSUInteger i = 0; i < _perRow; i++) {
+        unsigned long long off = start + i;
+        if (off >= _size) { [line appendAttributedString:[[NSAttributedString alloc] initWithString:@"   " attributes:@{ NSFontAttributeName: font }]]; continue; }
+        int b = [self byteAt:off];
+        UIColor *color = UIColor.labelColor;
+        BOOL edited = _edits[@(off)] != nil;
+        BOOL match = _matchLength && off >= _matchOffset && off < _matchOffset + _matchLength;
+        if (edited) color = UIColor.systemOrangeColor;
+        NSMutableDictionary *attrs = [@{ NSFontAttributeName: font, NSForegroundColorAttributeName: color } mutableCopy];
+        if (match) attrs[NSBackgroundColorAttributeName] = [UIColor.systemYellowColor colorWithAlphaComponent:0.45];
+        NSString *hex = b < 0 ? @"·· " : [NSString stringWithFormat:@"%02x ", b];
+        [line appendAttributedString:[[NSAttributedString alloc] initWithString:hex attributes:attrs]];
+        if (edited || match) [asciiMarks addObject:[NSValue valueWithRange:NSMakeRange(ascii.length, 1)]];
+        [ascii appendFormat:@"%c", (b >= 0x20 && b < 0x7f) ? b : '.'];
+    }
+    NSMutableAttributedString *asc = [[NSMutableAttributedString alloc] initWithString:[@" " stringByAppendingString:ascii]
+        attributes:@{ NSFontAttributeName: font, NSForegroundColorAttributeName: UIColor.secondaryLabelColor }];
+    for (NSValue *v in asciiMarks) {
+        NSRange r = v.rangeValue;
+        [asc addAttribute:NSForegroundColorAttributeName value:UIColor.systemOrangeColor range:NSMakeRange(r.location + 1, 1)];
+    }
+    [line appendAttributedString:asc];
+    UIListContentConfiguration *c = [UIListContentConfiguration cellConfiguration];
+    c.attributedText = line;
+    c.textProperties.numberOfLines = 1;
+    c.directionalLayoutMargins = NSDirectionalEdgeInsetsMake(0, 8, 0, 8);
+    cell.contentConfiguration = c;
+    cell.selectionStyle = _readOnly ? UITableViewCellSelectionStyleNone : UITableViewCellSelectionStyleDefault;
+    return cell;
+}
+
+- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
+{
+    [tableView deselectRowAtIndexPath:indexPath animated:YES];
+    if (_readOnly || _editState.saving) return;
+    unsigned long long start = (unsigned long long)indexPath.row * _perRow;
+    NSUInteger count = (NSUInteger)MIN((unsigned long long)_perRow, _size - start);
+    NSMutableString *current = [NSMutableString new];
+    for (NSUInteger i = 0; i < count; i++) {
+        int b = [self byteAt:start + i];
+        if (b < 0) return;   // page not loaded yet
+        [current appendFormat:i ? @" %02x" : @"%02x", b];
+    }
+    UIAlertController *a = wq_alert_controller(WQLocalizedFormat(@"Bytes at 0x%llx", start), WQLocalizedFormat(@"Overwrite these %lu bytes (hex). The file size stays the same.", (unsigned long)count), UIAlertControllerStyleAlert);
+    [a addTextFieldWithConfigurationHandler:^(UITextField *f) {
+        f.text = current;
+        f.font = [UIFont monospacedSystemFontOfSize:14 weight:UIFontWeightRegular];
+        f.autocapitalizationType = UITextAutocapitalizationTypeNone;
+        f.autocorrectionType = UITextAutocorrectionTypeNo;
+    }];
+    [a addAction:wq_alert_action(@"Cancel", UIAlertActionStyleCancel, nil)];
+    [a addAction:wq_alert_action(@"Set", UIAlertActionStyleDefault, ^(UIAlertAction *__unused x) {
+        NSData *bytes = WQParseHex(a.textFields.firstObject.text ?: @"", NO);
+        if (bytes.length != count) {
+            wqh_alert(self, @"Not changed", WQLocalizedFormat(@"Enter exactly %lu bytes in hex.", (unsigned long)count));
+            return;
+        }
+        const uint8_t *nb = bytes.bytes;
+        for (NSUInteger i = 0; i < count; i++) {
+            unsigned long long off = start + i;
+            if ([self originalByteAt:off] == nb[i]) [self->_edits removeObjectForKey:@(off)];
+            else self->_edits[@(off)] = @(nb[i]);
+        }
+        [self->_editState noteChange];
+        [self updateBar];
+        [self.tableView reloadRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationNone];
+    })];
+    [self presentViewController:a animated:YES completion:nil];
+}
+
+#pragma mark Save, discard, leave
+
+- (BOOL)wq_needsLeaveConfirmation
+{
+    return _edits.count > 0 || _editState.saving;
+}
+
+- (NSDictionary<NSNumber *, NSData *> *)runs
+{
+    NSMutableDictionary *runs = [NSMutableDictionary new];
+    NSArray *offsets = [_edits.allKeys sortedArrayUsingSelector:@selector(compare:)];
+    unsigned long long runStart = 0;
+    NSMutableData *run = nil;
+    for (NSNumber *o in offsets) {
+        unsigned long long off = o.unsignedLongLongValue;
+        uint8_t b = (uint8_t)_edits[o].intValue;
+        if (run && off == runStart + run.length) { [run appendBytes:&b length:1]; continue; }
+        if (run) runs[@(runStart)] = run;
+        runStart = off;
+        run = [NSMutableData dataWithBytes:&b length:1];
+    }
+    if (run) runs[@(runStart)] = run;
+    return runs;
+}
+
+- (BOOL)blockWhileSaving
+{
+    if (!_editState.saving) return NO;
+    wqh_alert(self, @"Save in progress", @"Wait for the save to finish before leaving or changing these edits.");
+    return YES;
+}
+
+- (void)save
+{
+    if (!_edits.count || [self blockWhileSaving]) return;
+    if (!_version) {
+        wqh_alert(self, @"Save unavailable", @"The file version could not be verified. Close and reopen it before saving.");
+        return;
+    }
+    NSDictionary *runs = [self runs];
+    UIAlertController *a = wq_alert_controller(@"Save changes?", WQLocalizedFormat(@"%lu bytes in %@ are overwritten in place. The current file is backed up first.", (unsigned long)_edits.count, _path), UIAlertControllerStyleAlert);
+    [a addAction:wq_alert_action(@"Cancel", UIAlertActionStyleCancel, nil)];
+    [a addAction:wq_alert_action(@"Save", UIAlertActionStyleDestructive, ^(UIAlertAction *__unused x) {
+        NSDictionary *expectedVersion = [self->_version copy];
+        if (!expectedVersion) {
+            wqh_alert(self, @"Save unavailable", @"The file version could not be verified. Close and reopen it before saving.");
+            return;
+        }
+        NSUInteger savedRevision = [self->_editState beginSave];
+        [self updateBar];
+        NSString *path = self->_path;
+        dispatch_async(self->_queue, ^{
+            NSString *error = nil;
+            NSDictionary *savedVersion = nil;
+            BOOL ok = wq_patch_if_unchanged_get_version(path, runs, expectedVersion, &savedVersion, &error);
+            dispatch_async(dispatch_get_main_queue(), ^{
+                [self->_editState finishSave:ok revision:savedRevision];
+                if (!ok) {
+                    [self updateBar];
+                    wqh_alert(self, @"Save failed", error ?: wq_permission_hint(path, YES) ?: @"Unknown error");
+                    return;
+                }
+                self->_version = savedVersion;
+                self->_status = nil;
+                if (self->_editState.revision == savedRevision) [self->_edits removeAllObjects];
+                [self->_pages removeAllObjects];
+                [self updateBar];
+                [self.tableView reloadData];
+            });
+        });
+    })];
+    [self presentViewController:a animated:YES completion:nil];
+}
+
+- (void)discard
+{
+    if ([self blockWhileSaving]) return;
+    [_edits removeAllObjects];
+    [_editState discard];
+    [self updateBar];
+    [self.tableView reloadData];
+}
+
+// Home button: ask before throwing away unsaved changes.
+- (void)confirmLeaveThen:(void (^)(void))proceed
+{
+    if ([self blockWhileSaving]) return;
+    if (!_edits.count) { proceed(); return; }
+    UIAlertController *a = wq_alert_controller(@"Discard changes?", @"Your byte changes have not been saved.", UIAlertControllerStyleAlert);
+    [a addAction:wq_alert_action(@"Keep Editing", UIAlertActionStyleCancel, nil)];
+    [a addAction:wq_alert_action(@"Discard", UIAlertActionStyleDestructive, ^(UIAlertAction *__unused x) {
+        [self->_edits removeAllObjects];
+        [self->_editState discard];
+        proceed();
+    })];
+    [self presentViewController:a animated:YES completion:nil];
+}
+
+- (void)leave
+{
+    [self confirmLeaveThen:^{
+        [self.navigationController popViewControllerAnimated:YES];
+    }];
+}
+
+#pragma mark Navigation and search
+
+- (void)scrollToOffset:(unsigned long long)offset
+{
+    if (_size == 0) return;
+    if (offset >= _size) offset = _size - 1;
+    NSInteger row = (NSInteger)(offset / _perRow);
+    [self.tableView scrollToRowAtIndexPath:[NSIndexPath indexPathForRow:row inSection:0]
+                          atScrollPosition:UITableViewScrollPositionMiddle animated:YES];
+}
+
+- (void)goToOffset
+{
+    UIAlertController *a = wq_alert_controller(@"Go to Offset", @"Hex (0x1a2b) or decimal", UIAlertControllerStyleAlert);
+    [a addTextFieldWithConfigurationHandler:^(UITextField *f) {
+        f.placeholder = @"0x0";
+        f.autocapitalizationType = UITextAutocapitalizationTypeNone;
+        f.autocorrectionType = UITextAutocorrectionTypeNo;
+    }];
+    [a addAction:wq_alert_action(@"Cancel", UIAlertActionStyleCancel, nil)];
+    [a addAction:wq_alert_action(@"Go", UIAlertActionStyleDefault, ^(UIAlertAction *__unused x) {
+        NSString *t = [a.textFields.firstObject.text stringByTrimmingCharactersInSet:NSCharacterSet.whitespaceCharacterSet];
+        unsigned long long off = 0;
+        if (!WQHexParseOffset(t, &off)) {
+            wqh_alert(self, @"Invalid offset", @"Enter a complete non-negative decimal value or a 0x-prefixed hexadecimal value.");
+            return;
+        }
+        if (_size == 0) {
+            wqh_alert(self, @"Offset unavailable", @"The file is empty or its size is still loading.");
+            return;
+        }
+        if (off >= _size) {
+            wqh_alert(self, @"Offset out of range", WQLocalizedFormat(@"Enter an offset from 0x0 through 0x%llx.", _size - 1));
+            return;
+        }
+        [self scrollToOffset:off];
+    })];
+    [self presentViewController:a animated:YES completion:nil];
+}
+
+- (void)promptFindHex:(BOOL)hex
+{
+    UIAlertController *a = wq_alert_controller(hex ? @"Find Hex Bytes" : @"Find Text", @"Searches the saved file forward from the top of the screen.", UIAlertControllerStyleAlert);
+    [a addTextFieldWithConfigurationHandler:^(UITextField *f) {
+        f.placeholder = hex ? @"de ad be ef" : WQLocalized(@"text");
+        f.autocapitalizationType = UITextAutocapitalizationTypeNone;
+        f.autocorrectionType = UITextAutocorrectionTypeNo;
+    }];
+    [a addAction:wq_alert_action(@"Cancel", UIAlertActionStyleCancel, nil)];
+    [a addAction:wq_alert_action(@"Find", UIAlertActionStyleDefault, ^(UIAlertAction *__unused x) {
+        NSString *t = a.textFields.firstObject.text ?: @"";
+        if (!WQHexSearchInputWithinLimit(t)) {
+            wqh_alert(self, @"Search too large", @"Use at most 1 MiB of UTF-8 search input.");
+            return;
+        }
+        NSData *needle = hex ? WQParseHex(t, NO) : [t dataUsingEncoding:NSUTF8StringEncoding];
+        if (needle.length == 0) { wqh_alert(self, @"Nothing to find", hex ? @"Enter hex bytes, e.g. de ad be ef." : @"Enter some text."); return; }
+        BOOL sameNeedle = self->_lastSearchNeedle && [self->_lastSearchNeedle isEqualToData:needle];
+        NSInteger topRow = NSIntegerMax;
+        for (NSIndexPath *indexPath in self.tableView.indexPathsForVisibleRows) {
+            if (indexPath.section == 0) topRow = MIN(topRow, indexPath.row);
+        }
+        if (topRow == NSIntegerMax) topRow = 0;
+        unsigned long long from = (sameNeedle && self->_matchLength && self->_matchOffset < ULLONG_MAX)
+            ? self->_matchOffset + 1 : (unsigned long long)topRow * self->_perRow;
+        if (!sameNeedle) self->_matchLength = 0;
+        self->_lastSearchNeedle = [needle copy];
+        [self search:needle from:from];
+    })];
+    [self presentViewController:a animated:YES completion:nil];
+}
+
+- (void)search:(NSData *)needle from:(unsigned long long)from
+{
+    NSUInteger generation = ++_searchGeneration;
+    _status = WQLocalized(@"Searching…");
+    [self updateBar];
+    NSString *path = _path;
+    unsigned long long size = _size;
+    NSUInteger requestLength = kSearchChunk + needle.length - 1;
+    dispatch_async(_queue, ^{
+        unsigned long long found = ULLONG_MAX;
+        NSString *error = nil;
+        for (unsigned long long pos = from; pos < size && found == ULLONG_MAX; ) {
+            NSUInteger length = (NSUInteger)MIN((unsigned long long)requestLength, size - pos);
+            NSData *chunk = wq_read_range(path, pos, length, &error);
+            if (!chunk || chunk.length < needle.length) break;
+            NSRange r = [chunk rangeOfData:needle options:0 range:NSMakeRange(0, chunk.length)];
+            if (r.location != NSNotFound) found = pos + r.location;
+            if (size - pos <= kSearchChunk) break;
+            pos += kSearchChunk;
+        }
+        dispatch_async(dispatch_get_main_queue(), ^{
+            if (generation != self->_searchGeneration || !wqh_is_visible(self)) return;
+            self->_status = nil;
+            [self updateBar];
+            if (found == ULLONG_MAX) {
+                self->_matchLength = 0;
+                [self.tableView reloadData];
+                wqh_alert(self, @"Not found", error ?: WQLocalizedFormat(@"No match after offset 0x%llx.", from));
+                return;
+            }
+            self->_matchOffset = found;
+            self->_matchLength = needle.length;
+            [self.tableView reloadData];
+            [self scrollToOffset:found];
+        });
+    });
+}
+
+@end

source/hook/src/WQHexViewerHelpers.h

@@ -0,0 +1,58 @@
+//
+//  WQHexViewerHelpers.h
+//  WQ Files
+//
+//  Small Foundation-portable validation helpers for the hex viewer.
+//
+
+#ifndef WQHexViewerHelpers_h
+#define WQHexViewerHelpers_h
+
+#import <Foundation/Foundation.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+
+// Keep both the search needle and the range-read overlap bounded before either
+// can be materialized. This is a UTF-8 input limit, not a UI character limit.
+static const NSUInteger WQHexSearchMaximumInputBytes = 1024UL * 1024UL;
+
+static inline BOOL WQHexSearchInputWithinLimit(NSString *text)
+{
+    return text && [text lengthOfBytesUsingEncoding:NSUTF8StringEncoding] <= WQHexSearchMaximumInputBytes;
+}
+
+// Parses the complete trimmed input as an unsigned decimal or 0x-prefixed
+// hexadecimal offset. The caller remains responsible for checking file range.
+static inline BOOL WQHexParseOffset(NSString *text, unsigned long long *offset)
+{
+    if (!text || !offset) return NO;
+    NSString *trimmed = [text stringByTrimmingCharactersInSet:NSCharacterSet.whitespaceAndNewlineCharacterSet];
+    if (!trimmed.length) return NO;
+
+    BOOL hex = [trimmed hasPrefix:@"0x"] || [trimmed hasPrefix:@"0X"];
+    NSString *digits = hex ? [trimmed substringFromIndex:2] : trimmed;
+    if (!digits.length) return NO;
+
+    unichar first = [digits characterAtIndex:0];
+    if (first == '-' || first == '+') return NO;
+    for (NSUInteger i = 0; i < digits.length; i++) {
+        unichar c = [digits characterAtIndex:i];
+        BOOL valid = c >= '0' && c <= '9';
+        if (hex) valid = valid || (c >= 'a' && c <= 'f') || (c >= 'A' && c <= 'F');
+        if (!valid) return NO;
+    }
+
+    const char *input = digits.UTF8String;
+    NSUInteger inputBytes = [digits lengthOfBytesUsingEncoding:NSUTF8StringEncoding];
+    if (!input || strlen(input) != inputBytes) return NO;
+
+    errno = 0;
+    char *end = NULL;
+    unsigned long long parsed = strtoull(input, &end, hex ? 16 : 10);
+    if (errno == ERANGE || end == input || !end || *end != '\0') return NO;
+    *offset = parsed;
+    return YES;
+}
+
+#endif

source/hook/src/WQLaunchServices.h

@@ -0,0 +1,39 @@
+//
+//  WQLaunchServices.h
+//  WQ Files
+//
+
+#import <Foundation/Foundation.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+// Human app name for a bundle id, from LaunchServices' database (read from
+// lsd's container), a built-in table of Apple services, or the parent app.
+NSString *_Nullable wq_display_name(NSString *_Nullable bundleID);
+
+// Bundle id of an app or extension data container (/private/var/mobile/
+// Containers/Data/...) or an app bundle container, from the same
+// LaunchServices database. For iOS 27.2, where the containers' identifier
+// attribute can't be read. Nil if unknown.
+NSString *_Nullable wq_bundle_id_for_container(NSString *path);
+
+// Whether the name database is loaded; loading it (blocking, off the main
+// thread) the first time can take a while, so screens show a status for it.
+BOOL wq_display_names_loaded(void);
+void wq_load_display_names(void);
+// After a user's refresh: search for a database that wasn't found before
+// right away instead of waiting a day.
+void wq_display_names_reset_miss(void);
+// Every app and extension data container the LaunchServices database lists,
+// read from storeHint (remembered when it parses) or the remembered location.
+// Never scans. Nil when there's no usable database.
+NSArray<NSString *> *_Nullable wq_ls_container_paths(NSString *_Nullable storeHint);
+// The .app bundle of an installed app, from the same database (for icons
+// where iOS won't hand them out). Nil if unknown.
+NSString *_Nullable wq_bundle_path_for_id(NSString *bundleID);
+// The app bundle containers (/private/var/containers/Bundle/Application/
+// <UUID>) of installed apps, from the same database; empty if unknown.
+// wq_bundle_id_for_container also labels these.
+NSArray<NSString *> *wq_ls_bundle_containers(void);
+
+NS_ASSUME_NONNULL_END

source/hook/src/WQLaunchServices.m

@@ -0,0 +1,897 @@
+//
+//  WQLaunchServices.m
+//  WQ Files
+//  GPL-3.0-or-later.
+//
+
+#import "WQLaunchServices.h"
+#import "WQLocalization.h"
+#import "WQAccess.h"
+#import <stdlib.h>
+#import <string.h>
+#import <sys/stat.h>
+
+#pragma mark - App names from the LaunchServices database
+
+// LaunchServices' own API refuses this app on 27.x (OSStatus -54) and the app
+// bundles cannot be opened, but lsd keeps its database (CSStore2, magic
+// "bdsl") in an Internal Daemon container that we can read. In it, Bundle
+// records are 0x250 bytes long, preceded by [u32][u32 0x250]: +0x0c bundle
+// id, +0x6c bundle name, +0x74 display name, each a string reference
+// (string id << 2). Strings are stored as [u32 id][u32 length][UTF-8][NUL].
+// Names that exist only in localized form (most Apple apps) are not decoded;
+// the built-in table below covers those.
+
+static NSString *const kWQLSStoreKey = @"WQLaunchServicesStore";
+// When the database wasn't found: don't search again for a day (each search
+// lists every daemon container), unless the user refreshes.
+static NSString *const kWQLSMissKey = @"WQLaunchServicesStoreMissedAt";
+static const NSTimeInterval kWQLSMissRetry = 24 * 60 * 60;
+
+// These limits keep a malformed or unexpectedly large database from turning a
+// synchronous display-name lookup into an unbounded read/parse operation.
+static const size_t kWQLSMinStoreBytes = 0x1000;
+static const size_t kWQLSMaxStoreBytes = 64u * 1024u * 1024u;
+static const uint32_t kWQLSMaxStringID = 0x01000000u;
+static const NSUInteger kWQLSMaxBundleRecords = 100000;
+static const NSUInteger kWQLSMaxDecodedStrings = 200000;
+static const NSUInteger kWQLSMaxDecodedStringBytes = 8u * 1024u * 1024u;
+
+static NSObject *wq_ls_lock(void)
+{
+    static NSObject *lock;
+    static dispatch_once_t once;
+    dispatch_once(&once, ^{ lock = [NSObject new]; });
+    return lock;
+}
+
+// The regression tests still exercise discovery through the daemon list.
+#ifdef WQ_LS_TESTING
+static BOOL wq_ls_test_daemon_search = YES;
+#else
+static const BOOL wq_ls_test_daemon_search = NO;
+#endif
+
+static NSString *wq_find_ls_store(BOOL *searched);
+static BOOL wq_ls_candidate_info(NSString *path, struct stat *st);
+
+static BOOL wq_ls_stat_equal(const struct stat *a, const struct stat *b)
+{
+    return a->st_dev == b->st_dev && a->st_ino == b->st_ino &&
+        a->st_size == b->st_size &&
+        a->st_mtimespec.tv_sec == b->st_mtimespec.tv_sec &&
+        a->st_mtimespec.tv_nsec == b->st_mtimespec.tv_nsec;
+}
+
+static NSDictionary *wq_ls_signature(const struct stat *st)
+{
+    return @{
+        @"device": @(st->st_dev), @"inode": @(st->st_ino), @"size": @(st->st_size),
+        @"modifiedSeconds": @(st->st_mtimespec.tv_sec),
+        @"modifiedNanoseconds": @(st->st_mtimespec.tv_nsec)
+    };
+}
+
+static BOOL wq_ls_signature_equal(NSDictionary *a, NSDictionary *b)
+{
+    return a && b && [a isEqualToDictionary:b];
+}
+
+static NSString *wq_ls_error(NSString *path, NSString *reason)
+{
+    return [NSString stringWithFormat:@"%@ (%@)", path ?: @"<none>", reason ?: @"unknown error"];
+}
+
+static BOOL wq_ls_candidate_info(NSString *path, struct stat *st)
+{
+    if (!path.length || !wq_stat(path, st) || !S_ISREG(st->st_mode) ||
+        st->st_size < (off_t)kWQLSMinStoreBytes || st->st_size > (off_t)kWQLSMaxStoreBytes) {
+        return NO;
+    }
+    NSString *error = nil;
+    NSData *header = wq_read(path, 4, &error);
+    if (header.length != 4 || memcmp(header.bytes, "bdsl", 4) != 0) return NO;
+    return YES;
+}
+
+static BOOL wq_ls_is_newer(NSString *path, const struct stat *st,
+                           NSString *bestPath, const struct stat *best)
+{
+    if (!bestPath) return YES;
+    if (st->st_mtimespec.tv_sec != best->st_mtimespec.tv_sec)
+        return st->st_mtimespec.tv_sec > best->st_mtimespec.tv_sec;
+    if (st->st_mtimespec.tv_nsec != best->st_mtimespec.tv_nsec)
+        return st->st_mtimespec.tv_nsec > best->st_mtimespec.tv_nsec;
+    if (st->st_size != best->st_size) return st->st_size > best->st_size;
+    return [path compare:bestPath] == NSOrderedAscending;
+}
+
+static void wq_ls_consider_candidate(NSString *path, NSString **bestPath,
+                                      struct stat *best, NSMutableSet<NSString *> *seen)
+{
+    if (!path.length || [seen containsObject:path]) return;
+    [seen addObject:path];
+
+    struct stat st;
+    if (!wq_ls_candidate_info(path, &st)) return;
+    if (wq_ls_is_newer(path, &st, *bestPath, best)) {
+        *bestPath = path;
+        *best = st;
+    }
+}
+
+// *searched: the daemon containers were actually listed (a failed or cancelled
+// scan says nothing about whether the database exists).
+static NSString *wq_find_ls_store(BOOL *searched)
+{
+    if (searched) *searched = NO;
+    NSString *cached = [NSUserDefaults.standardUserDefaults stringForKey:kWQLSStoreKey];
+    NSString *bestPath = nil;
+    struct stat best = {0};
+    struct stat cachedStat;
+    BOOL cachedValid = cached.length && wq_ls_candidate_info(cached, &cachedStat);
+    NSMutableSet<NSString *> *seen = [NSMutableSet set];
+    if (cachedValid) wq_ls_consider_candidate(cached, &bestPath, &best, seen);
+
+    // Listing the daemon containers is a full id scan (minutes, and it asks
+    // first); the database is found by the container scan among the newest
+    // ids and remembered, so names only use the remembered location.
+    if (!wq_ls_test_daemon_search) {
+        if (searched) *searched = cachedValid;
+        return cachedValid ? cached : nil;
+    }
+    NSArray *daemons = wq_enumerate(@"/private/var/mobile/Containers/Data/InternalDaemon", 0, nil, nil);
+    if (daemons && searched) *searched = YES;
+    if (daemons) {
+        for (NSString *container in daemons) {
+            NSString *caches = [container stringByAppendingPathComponent:@"Library/Caches"];
+            NSArray *items = wq_list(caches, NULL);
+            for (NSString *name in [items sortedArrayUsingSelector:@selector(compare:)]) {
+                if (![name hasPrefix:@"com.apple.LaunchServices-"] || ![name hasSuffix:@".csstore"]) continue;
+                wq_ls_consider_candidate([caches stringByAppendingPathComponent:name], &bestPath, &best, seen);
+            }
+        }
+    }
+
+    // Keep a valid cached path usable if enumeration is temporarily unavailable.
+    if (!bestPath && cachedValid) {
+        bestPath = cached;
+    }
+    return bestPath;
+}
+
+// Record layouts by release. Offsets are from the record body (after the
+// 8-byte header). iOS 26 records are 0x14 bytes shorter, with the container
+// path and the fields after it 4 bytes earlier than on 27.0.
+typedef struct {
+    const char *label;
+    uint32_t bundleSize, bundleID, container, name, displayName, bundlePath;
+    uint32_t pluginSize, pluginBundleID, pluginContainer;
+} WQLSLayout;
+static const WQLSLayout kWQLSLayouts[] = {
+    { "27.0", 0x250, 0x0c, 0x68, 0x6c, 0x74, 0x00, 0x118, 0x00, 0x54 },
+    { "26",   0x23c, 0x0c, 0x64, 0x68, 0x70, 0x00, 0x104, 0x00, 0x50 },
+    // iOS 26.5 (from a device's layout hint, issue #37): same record sizes,
+    // container fields 4 bytes earlier than on 26.7. Whether the bundle id
+    // moved too isn't known, so both positions are tried.
+    { "26.5",  0x23c, 0x0c, 0x60, 0x64, 0x6c, 0x00, 0x104, 0x00, 0x4c },
+    { "26.5b", 0x23c, 0x08, 0x60, 0x64, 0x6c, 0x00, 0x104, 0x00, 0x4c },
+    // iOS 27.2 (from a device's layout hint): container fields 4 bytes later
+    // than on 27.0. Whether the bundle id moved too isn't known yet, so both
+    // positions are tried; the one that maps the most containers wins.
+    { "27.2", 0x25c, 0x0c, 0x6c, 0x70, 0x78, 0x00, 0x120, 0x00, 0x58 },
+    { "27.2b", 0x25c, 0x10, 0x6c, 0x70, 0x78, 0x00, 0x120, 0x04, 0x58 },
+    { "27.2c", 0x25c, 0x0c, 0x6c, 0x70, 0x78, 0x00, 0x120, 0x04, 0x58 },
+    { "27.2d", 0x25c, 0x10, 0x6c, 0x70, 0x78, 0x00, 0x120, 0x00, 0x58 },
+};
+static const size_t kWQLSLayoutCount = sizeof(kWQLSLayouts) / sizeof(kWQLSLayouts[0]);
+static const size_t kWQLSMaxRecordSize = 0x25c;
+
+static uint32_t wq_rd32(const uint8_t *p) { uint32_t v; memcpy(&v, p, 4); return v; }
+
+static NSString *wq_cs_string(const uint8_t *b, size_t n, size_t o)
+{
+    if (o > n || n - o < 8) return nil;
+    uint32_t len = wq_rd32(b + o + 4);
+    // Strings are padded with zero bytes to a multiple of 4. One whose length
+    // is already a multiple of 4 has no terminator (container paths are 84 or
+    // 88 bytes), so only shorter ones must end in a zero byte. A string must
+    // still end before the buffer does.
+    if (len == 0 || len >= 0x800 || len >= n - o - 8 || (len % 4 && b[o + 8 + len] != 0)) return nil;
+    if (memchr(b + o + 8, 0, len)) return nil;
+    NSString *s = [[NSString alloc] initWithBytes:b + o + 8 length:len encoding:NSUTF8StringEncoding];
+    return s;
+}
+
+static BOOL wq_looks_like_bundle_id(NSString *s)
+{
+    static NSCharacterSet *bad;
+    static dispatch_once_t once;
+    dispatch_once(&once, ^{
+        bad = [[NSCharacterSet characterSetWithCharactersInString:
+                @"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789.-_"] invertedSet];
+    });
+    return s.length > 2 && [s containsString:@"."] && ![s hasPrefix:@"."]
+        && [s rangeOfCharacterFromSet:bad].location == NSNotFound;
+}
+
+// Unicode format characters include bidi overrides/isolates, zero-width
+// characters, and BOM-like markers. They are replaced visibly while ordinary
+// international letters, accents, and scripts remain unchanged.
+static BOOL wq_is_name_format_scalar(uint32_t c)
+{
+    return c == 0x00ad || (c >= 0x0600 && c <= 0x0605) || c == 0x061c || c == 0x06dd ||
+        c == 0x070f || (c >= 0x0890 && c <= 0x0891) || c == 0x08e2 || c == 0x180e ||
+        (c >= 0x200b && c <= 0x200f) || (c >= 0x202a && c <= 0x202e) ||
+        (c >= 0x2060 && c <= 0x206f) || c == 0xfeff;
+}
+
+static NSString *wq_safe_name(NSString *value)
+{
+    if (!value.length) return nil;
+    NSMutableString *safe = [NSMutableString stringWithCapacity:value.length];
+    for (NSUInteger i = 0; i < value.length;) {
+        uint32_t scalar = [value characterAtIndex:i++];
+        if (scalar >= 0xd800 && scalar <= 0xdbff) {
+            if (i >= value.length) return nil;
+            unichar low = [value characterAtIndex:i++];
+            if (low < 0xdc00 || low > 0xdfff) return nil;
+            scalar = 0x10000u + ((scalar - 0xd800u) << 10) + (low - 0xdc00u);
+        } else if (scalar >= 0xdc00 && scalar <= 0xdfff) {
+            return nil;
+        }
+
+        if (wq_is_name_format_scalar(scalar) || scalar == 0x2028 || scalar == 0x2029) {
+            [safe appendString:@"\uFFFD"];
+        } else if (scalar <= 0xffff) {
+            [safe appendFormat:@"%C", (unichar)scalar];
+        } else {
+            scalar -= 0x10000u;
+            [safe appendFormat:@"%C%C", (unichar)(0xd800u + (scalar >> 10)),
+             (unichar)(0xdc00u + (scalar & 0x3ffu))];
+        }
+    }
+
+    NSString *normalized = [safe precomposedStringWithCanonicalMapping];
+    normalized = [normalized stringByTrimmingCharactersInSet:NSCharacterSet.whitespaceAndNewlineCharacterSet];
+    if (!normalized.length || [normalized hasPrefix:@"/"] || [normalized containsString:@".app/"]) return nil;
+    if ([normalized rangeOfCharacterFromSet:NSCharacterSet.controlCharacterSet].location != NSNotFound) return nil;
+    return normalized;
+}
+
+// Data container path -> bundle id. Apps: the Bundle record's +0x68 field;
+// extensions: 0x118-byte plugin records with the bundle id at +0x00 and the
+// path at +0x54. On iOS 27.2 the containers' identifier attribute can't be
+// read, so this is how their folders get a bundle id (and a name).
+static BOOL wq_is_data_container_path(NSString *path)
+{
+    static NSArray<NSString *> *prefixes;
+    static dispatch_once_t once;
+    dispatch_once(&once, ^{
+        prefixes = @[@"/private/var/mobile/Containers/Data/Application/",
+                     @"/private/var/mobile/Containers/Data/PluginKitPlugin/"];
+    });
+    for (NSString *prefix in prefixes) {
+        if (![path hasPrefix:prefix] || path.length != prefix.length + 36) continue;
+        return [[NSUUID alloc] initWithUUIDString:[path substringFromIndex:prefix.length]] != nil;
+    }
+    return NO;
+}
+
+// Diagnostics: how many container paths the store holds, and which record
+// sizes and offsets refer to them. Only sizes and offsets are logged (no
+// names), so a Log from a release with a new layout shows where it moved.
+static int wq_u32_cmp(const void *a, const void *b)
+{
+    uint32_t x = *(const uint32_t *)a, y = *(const uint32_t *)b;
+    return x < y ? -1 : x > y;
+}
+
+// String refs of the data container paths stored in the database, sorted;
+// independent of the record layout.
+static NSMutableData *wq_ls_container_path_refs(const uint8_t *b, size_t n)
+{
+    NSMutableData *refData = [NSMutableData new];
+    static const char needle[] = "/var/mobile/Containers/Data/";
+    const size_t needleLen = sizeof(needle) - 1;
+    const uint8_t *cursor = b, *end = b + n;
+    while (cursor < end) {
+        const uint8_t *hit = memmem(cursor, (size_t)(end - cursor), needle, needleLen);
+        if (!hit) break;
+        cursor = hit + needleLen;
+        const uint8_t *start = hit;
+        if ((size_t)(hit - b) >= 8 && memcmp(hit - 8, "/private", 8) == 0) start = hit - 8;
+        size_t o = (size_t)(start - b);
+        if (o < 8 || o % 4) continue;
+        uint32_t len = wq_rd32(start - 4);
+        if (len < needleLen || len > 0x100 || len > (size_t)(end - start)) continue;
+        uint32_t ref = wq_rd32(start - 8) << 2;
+        if (ref) [refData appendBytes:&ref length:sizeof(ref)];
+        if (refData.length / sizeof(uint32_t) >= 20000) break;
+    }
+    NSUInteger count = refData.length / sizeof(uint32_t);
+    if (count) qsort(refData.mutableBytes, count, sizeof(uint32_t), wq_u32_cmp);
+    return refData;
+}
+
+static void wq_ls_log_summary(const uint8_t *b, size_t n, NSString *layout, NSUInteger bundleRecords,
+                              NSUInteger pluginRecords, NSUInteger names, NSUInteger mapped)
+{
+    NSMutableData *refData = wq_ls_container_path_refs(b, n);
+    NSUInteger pathCount = refData.length / sizeof(uint32_t);
+    uint32_t *refs = refData.mutableBytes;
+    wq_log(@"names: store %.1f MB, layout %@: %lu bundle and %lu plugin records, %lu names, %lu of %lu container paths mapped",
+           n / 1048576.0, layout, (unsigned long)bundleRecords, (unsigned long)pluginRecords, (unsigned long)names,
+           (unsigned long)mapped, (unsigned long)pathCount);
+    if (!pathCount || mapped * 2 >= pathCount) return;
+
+    // Vote for (record size, offset of the container reference).
+    NSCountedSet<NSNumber *> *votes = [NSCountedSet new];
+    for (size_t q = 0; q + 4 <= n; q += 4) {
+        uint32_t v = wq_rd32(b + q);
+        if (!v || (v & 3) || !bsearch(&v, refs, pathCount, sizeof(uint32_t), wq_u32_cmp)) continue;
+        for (size_t k = 0; k < 0x400 && q >= 8 + k; k += 4) {
+            uint32_t size = wq_rd32(b + q - 8 - k + 4);
+            if (size >= 0x40 && size <= 0x800 && size % 4 == 0 && k < size)
+                [votes addObject:@((uint64_t)size << 16 | k)];
+        }
+    }
+    NSArray *top = [votes.allObjects sortedArrayUsingComparator:^NSComparisonResult(NSNumber *x, NSNumber *y) {
+        NSUInteger cx = [votes countForObject:x], cy = [votes countForObject:y];
+        return cx > cy ? NSOrderedAscending : cx < cy ? NSOrderedDescending : [x compare:y];
+    }];
+    NSMutableArray *parts = [NSMutableArray new];
+    for (NSNumber *key in [top subarrayWithRange:NSMakeRange(0, MIN(top.count, (NSUInteger)8))]) {
+        uint64_t value = key.unsignedLongLongValue;
+        [parts addObject:[NSString stringWithFormat:@"0x%llx@0x%llx x%lu", value >> 16, value & 0xffff,
+                          (unsigned long)[votes countForObject:key]]];
+    }
+    wq_log(@"names: layout hint (record size@container offset): %@", [parts componentsJoinedByString:@", "]);
+}
+
+static BOOL wq_parse_ls_store(NSData *data, NSDictionary **displayOut,
+                              NSDictionary **bundleNameOut, NSDictionary **containersOut,
+                              NSDictionary **bundlePathsOut)
+{
+    if (bundlePathsOut) *bundlePathsOut = nil;
+    if (displayOut) *displayOut = nil;
+    if (bundleNameOut) *bundleNameOut = nil;
+    if (containersOut) *containersOut = nil;
+
+    const uint8_t *b = data.bytes;
+    size_t n = data.length;
+    if (n < kWQLSMinStoreBytes || !b || memcmp(b, "bdsl", 4) != 0) {
+        wq_log(@"names: not a LaunchServices store");
+        return NO;
+    }
+    NSRange heapRange = [data rangeOfData:[NSData dataWithBytes:"<string>" length:8]
+                                  options:0 range:NSMakeRange(0, n)];
+    size_t heap = heapRange.location == NSNotFound ? 0 : heapRange.location;
+
+    // Pass 1: Bundle and plug-in records of every known layout, and which
+    // string ids they need. The layout that maps the most containers wins.
+    const uint32_t kIDs = kWQLSMaxStringID;
+    size_t bitsetBytes = kIDs / 8;
+    uint8_t *need = calloc(bitsetBytes, 1), *inHeap = calloc(bitsetBytes, 1);
+    NSMutableArray<NSMutableData *> *layoutRecs = [NSMutableArray new], *layoutPlugins = [NSMutableArray new];
+    for (size_t l = 0; l < kWQLSLayoutCount; l++) {
+        [layoutRecs addObject:[NSMutableData new]];
+        [layoutPlugins addObject:[NSMutableData new]];   // pairs: bundle id ref, container path ref
+    }
+    if (!need || !inHeap) {
+        free(need);
+        free(inHeap);
+        wq_log(@"names: LaunchServices parser allocation failed");
+        return NO;
+    }
+
+    BOOL tooManyRecords = NO;
+    for (size_t o = 0; o + 8 + kWQLSMaxRecordSize <= n && !tooManyRecords; o += 4) {
+        uint32_t size = wq_rd32(b + o + 4);
+        const uint8_t *u = b + o + 8;
+        for (size_t l = 0; l < kWQLSLayoutCount; l++) {
+            const WQLSLayout *L = &kWQLSLayouts[l];
+            if (size == L->pluginSize) {
+                NSMutableData *plugins = layoutPlugins[l];
+                uint32_t p[2] = { wq_rd32(u + L->pluginBundleID), wq_rd32(u + L->pluginContainer) };
+                if (p[0] && !(p[0] & 3) && (p[0] >> 2) < kIDs && p[1] && !(p[1] & 3) && (p[1] >> 2) < kIDs &&
+                    plugins.length / sizeof(p) < kWQLSMaxBundleRecords) {
+                    [plugins appendBytes:p length:sizeof(p)];
+                    for (int i = 0; i < 2; i++) need[(p[i] >> 2) / 8] |= 1 << ((p[i] >> 2) % 8);
+                }
+            }
+            if (size != L->bundleSize) continue;
+            NSMutableData *recs = layoutRecs[l];
+            if (recs.length / (5 * sizeof(uint32_t)) >= kWQLSMaxBundleRecords) {
+                tooManyRecords = YES;
+                break;
+            }
+            uint32_t r[5] = { wq_rd32(u + L->bundleID), wq_rd32(u + L->name), wq_rd32(u + L->displayName), wq_rd32(u + L->container),
+                              wq_rd32(u + L->bundlePath) };
+            if (!r[0] || (r[0] & 3) || (r[0] >> 2) >= kIDs) continue;
+            [recs appendBytes:r length:sizeof(r)];
+            for (int i = 0; i < 5; i++) {
+                if (r[i] && !(r[i] & 3) && (r[i] >> 2) < kIDs)
+                    need[(r[i] >> 2) / 8] |= 1 << ((r[i] >> 2) % 8);
+            }
+        }
+    }
+    if (tooManyRecords) {
+        free(need);
+        free(inHeap);
+        wq_log(@"names: LaunchServices store exceeds record limit");
+        return NO;
+    }
+
+    // Pass 2: the strings, preferring copies inside the string table. On
+    // iOS 26 container paths live in a second table whose ids overlap the
+    // string table's, so path-shaped strings are also kept by id on their own
+    // (an id with two different paths is unusable).
+    NSMutableDictionary<NSNumber *, NSString *> *strings = [NSMutableDictionary new];
+    NSMutableDictionary<NSNumber *, id> *pathStrings = [NSMutableDictionary new];
+    NSMutableDictionary<NSNumber *, id> *appPathStrings = [NSMutableDictionary new];
+    NSUInteger decodedStringBytes = 0;
+    BOOL tooManyStrings = NO;
+    for (size_t o = 0; o <= n - 8; o += 4) {
+        uint32_t sid = wq_rd32(b + o);
+        if (!sid || sid >= kIDs || !(need[sid / 8] & (1 << (sid % 8)))) continue;
+        BOOL here = o >= heap, had = strings[@(sid)] != nil;
+        BOOL keepGeneral = !had || (here && !(inHeap[sid / 8] & (1 << (sid % 8))));
+        uint32_t peekLen = o + 8 <= n ? wq_rd32(b + o + 4) : 0;
+        BOOL maybePath = peekLen >= 6 && peekLen < 0x400 && o + 8 < n && b[o + 8] == '/';
+        if (!keepGeneral && !maybePath) continue;
+        NSString *s = wq_cs_string(b, n, o);
+        if (!s) continue;
+        if (maybePath) {
+            NSMutableDictionary *table = [s containsString:@"/mobile/Containers/Data/"] ? pathStrings
+                : ([s hasSuffix:@".app"] || [s hasSuffix:@".app/"]) ? appPathStrings : nil;
+            id previous = table[@(sid)];
+            if (table && !previous) table[@(sid)] = s;
+            else if (table && ![previous isEqual:s]) table[@(sid)] = NSNull.null;
+        }
+        if (!keepGeneral) continue;
+        if (!had && (strings.count >= kWQLSMaxDecodedStrings ||
+                     s.length > kWQLSMaxDecodedStringBytes - decodedStringBytes)) {
+            tooManyStrings = YES;
+            break;
+        }
+        strings[@(sid)] = s;
+        if (!had) decodedStringBytes += s.length;
+        if (here) inHeap[sid / 8] |= 1 << (sid % 8);
+    }
+    free(need);
+    free(inHeap);
+    if (tooManyStrings) {
+        wq_log(@"names: LaunchServices store exceeds string limit");
+        return NO;
+    }
+    NSUInteger anyRecords = 0, anyPlugins = 0;
+    for (size_t l = 0; l < kWQLSLayoutCount; l++) {
+        anyRecords += layoutRecs[l].length / (5 * sizeof(uint32_t));
+        anyPlugins += layoutPlugins[l].length / (2 * sizeof(uint32_t));
+    }
+    if (!anyRecords) {
+        wq_ls_log_summary(b, n, @"none", 0, anyPlugins, 0, 0);
+        wq_log(@"names: LaunchServices store contains no bundle records");
+        return NO;
+    }
+
+    NSString *(^pathFor)(uint32_t) = ^NSString *(uint32_t ref) {
+        id path = pathStrings[@(ref >> 2)];
+        if (path == NSNull.null) return nil;
+        return path ?: strings[@(ref >> 2)];
+    };
+    NSDictionary *display = nil, *bundleName = nil, *containers = nil, *bundlePaths = nil;
+    size_t chosen = 0;
+    for (size_t l = 0; l < kWQLSLayoutCount; l++) {
+        NSMutableDictionary *layoutDisplay = [NSMutableDictionary new], *layoutBundleName = [NSMutableDictionary new];
+        NSMutableDictionary *layoutBundlePaths = [NSMutableDictionary new];
+        NSMutableDictionary<NSString *, id> *layoutContainers = [NSMutableDictionary new];
+        // A path claimed by two different bundle ids is left out rather than guessed.
+        // Plug-in records only claim extension containers and bundle records
+        // only app containers, so a record type that happens to share a size
+        // can't knock out the other table's paths.
+        void (^claim)(NSString *, NSString *, NSString *) = ^(NSString *path, NSString *bid, NSString *kind) {
+            // iOS 26 stores container paths with a trailing slash; lookups
+            // use the /private/var form without one.
+            if ([path hasSuffix:@"/"]) path = [path substringToIndex:path.length - 1];
+            if ([path hasPrefix:@"/var/"]) path = [@"/private" stringByAppendingString:path];
+            if (!wq_is_data_container_path(path) || !wq_looks_like_bundle_id(bid) || ![path containsString:kind]) return;
+            id known = layoutContainers[path];
+            if (!known) layoutContainers[path] = bid;
+            else if (![known isEqual:bid]) layoutContainers[path] = NSNull.null;
+        };
+        NSData *plugins = layoutPlugins[l], *recs = layoutRecs[l];
+        const uint32_t *pr = plugins.bytes;
+        for (NSUInteger i = 0; i < plugins.length / sizeof(uint32_t); i += 2)
+            claim(pathFor(pr[i + 1]), strings[@(pr[i] >> 2)], @"/Data/PluginKitPlugin/");
+        const uint32_t *r = recs.bytes;
+        for (NSUInteger i = 0; i < recs.length / sizeof(uint32_t); i += 5) {
+            NSString *bid = strings[@(r[i] >> 2)];
+            if (!wq_looks_like_bundle_id(bid)) continue;
+            if (r[i + 3] && !(r[i + 3] & 3)) claim(pathFor(r[i + 3]), bid, @"/Data/Application/");
+            NSString *nm = (r[i + 1] & 3) ? nil : strings[@(r[i + 1] >> 2)];
+            NSString *dn = (r[i + 2] & 3) ? nil : strings[@(r[i + 2] >> 2)];
+            NSString *safeDisplay = wq_safe_name(dn);
+            NSString *safeBundleName = wq_safe_name(nm);
+            if (safeDisplay && !layoutDisplay[bid]) layoutDisplay[bid] = safeDisplay;
+            if (safeBundleName && !layoutBundleName[bid]) layoutBundleName[bid] = safeBundleName;
+            id appPath = (r[i + 4] && !(r[i + 4] & 3)) ? appPathStrings[@(r[i + 4] >> 2)] : nil;
+            if ([appPath isKindOfClass:NSString.class] && !layoutBundlePaths[bid]) {
+                NSString *clean = [appPath hasSuffix:@"/"] ? [appPath substringToIndex:[appPath length] - 1] : appPath;
+                if ([clean hasPrefix:@"/var/"]) clean = [@"/private" stringByAppendingString:clean];
+                layoutBundlePaths[bid] = clean;
+            }
+        }
+        for (NSString *path in layoutContainers.allKeys)
+            if (layoutContainers[path] == NSNull.null) [layoutContainers removeObjectForKey:path];
+        if (!containers || layoutContainers.count > containers.count ||
+            (layoutContainers.count == containers.count && layoutDisplay.count > display.count)) {
+            display = layoutDisplay;
+            bundleName = layoutBundleName;
+            bundlePaths = layoutBundlePaths;
+            containers = layoutContainers;
+            chosen = l;
+        }
+    }
+    // A few Apple apps' names, to check the name fields of a new layout.
+    NSMutableArray *samples = [NSMutableArray new];
+    for (NSString *bid in @[@"com.apple.mobilesafari", @"com.apple.Preferences", @"com.apple.camera", @"com.apple.mobilenotes"]) {
+        NSString *name = display[bid] ?: bundleName[bid];
+        if (name) [samples addObject:[NSString stringWithFormat:@"%@ = %@", bid, name]];
+    }
+    // The container scan and the name loader each parse the same store; log
+    // its summary once per distinct result, not once per parse.
+    static NSString *lastSummary;
+    NSString *summary = [NSString stringWithFormat:@"%zu %zu %lu %lu", n, chosen, (unsigned long)display.count,
+                         (unsigned long)containers.count];
+    BOOL newSummary;
+    @synchronized (NSObject.class) {
+        newSummary = ![summary isEqualToString:lastSummary];
+        if (newSummary) lastSummary = summary;
+    }
+    if (newSummary && samples.count) wq_log(@"names: sample: %@", [samples componentsJoinedByString:@", "]);
+    if (newSummary) wq_ls_log_summary(b, n, @(kWQLSLayouts[chosen].label), layoutRecs[chosen].length / (5 * sizeof(uint32_t)),
+                      layoutPlugins[chosen].length / (2 * sizeof(uint32_t)), display.count, containers.count);
+    // A layout that maps only a small part of the container paths in the store
+    // is the wrong one (its names are wrong too): don't use the store at all,
+    // so the app list falls back to the scan instead of showing a few apps.
+    NSUInteger storePaths = wq_ls_container_path_refs(b, n).length / sizeof(uint32_t);
+    if (storePaths >= 20 && containers.count * 2 < storePaths) {
+        if (newSummary)
+            wq_log(@"names: layout %s maps only %lu of %lu container paths; this iOS version's database layout isn't known, so it isn't used",
+                   kWQLSLayouts[chosen].label, (unsigned long)containers.count, (unsigned long)storePaths);
+        return NO;
+    }
+    if (bundlePathsOut) *bundlePathsOut = [bundlePaths copy];
+    if (displayOut) *displayOut = [display copy];
+    if (bundleNameOut) *bundleNameOut = [bundleName copy];
+    if (containersOut) *containersOut = [containers copy];
+    return YES;
+}
+
+static NSDictionary *gLSDisplay;
+static NSDictionary *gLSBundleName;
+static NSDictionary *gLSContainers;
+static NSDictionary *gLSBundlePaths;
+static NSString *gLSStorePath;
+static NSDictionary *gLSStoreSignature;
+static BOOL gLSLoaded;
+static NSUInteger gLSFailureCount;
+static NSTimeInterval gLSNextRetryAt;
+
+static void wq_ls_clear_snapshot_if_changed(BOOL changed)
+{
+    if (!changed) return;
+    gLSDisplay = nil;
+    gLSBundleName = nil;
+    gLSContainers = nil;
+    gLSBundlePaths = nil;
+    gLSStorePath = nil;
+    gLSStoreSignature = nil;
+    gLSLoaded = NO;
+}
+
+static void wq_ls_note_failure(NSTimeInterval now, NSString *reason)
+{
+    gLSFailureCount = MIN(gLSFailureCount + 1, (NSUInteger)6);
+    NSUInteger shift = gLSFailureCount > 1 ? gLSFailureCount - 1 : 0;
+    NSTimeInterval delay = (NSTimeInterval)(1u << MIN(shift, (NSUInteger)5));
+    gLSNextRetryAt = now + delay;
+    if (reason) wq_log(@"names: %@; retrying in %.0f s", reason, delay);
+}
+
+static void wq_load_ls_names_locked(void)
+{
+    NSTimeInterval now = NSDate.date.timeIntervalSinceReferenceDate;
+    BOOL currentChanged = NO;
+    if (gLSLoaded && gLSStorePath) {
+        struct stat current;
+        if (wq_ls_candidate_info(gLSStorePath, &current)) {
+            NSDictionary *signature = wq_ls_signature(&current);
+            currentChanged = !wq_ls_signature_equal(signature, gLSStoreSignature);
+            if (!currentChanged) return;
+        } else {
+            currentChanged = YES;
+        }
+    } else if (!gLSLoaded && now < gLSNextRetryAt) {
+        return;
+    } else if (!gLSLoaded && ![NSUserDefaults.standardUserDefaults stringForKey:kWQLSStoreKey].length) {
+        NSDate *missed = [NSUserDefaults.standardUserDefaults objectForKey:kWQLSMissKey];
+        if ([missed isKindOfClass:NSDate.class] && now - missed.timeIntervalSinceReferenceDate < kWQLSMissRetry &&
+            now >= missed.timeIntervalSinceReferenceDate) {
+            gLSNextRetryAt = missed.timeIntervalSinceReferenceDate + kWQLSMissRetry;
+            return;
+        }
+    }
+
+    BOOL hadLocation = [NSUserDefaults.standardUserDefaults stringForKey:kWQLSStoreKey].length > 0;
+    BOOL searched = NO;
+    NSString *path = wq_find_ls_store(&searched);
+    if (!path) {
+        wq_ls_clear_snapshot_if_changed(currentChanged);
+        if (!hadLocation && searched) {
+            // Never found, after a complete search: wait a day (or a refresh).
+            [NSUserDefaults.standardUserDefaults setObject:NSDate.date forKey:kWQLSMissKey];
+            gLSNextRetryAt = now + kWQLSMissRetry;
+            wq_log(@"names: LaunchServices database not found; searching again in a day or on refresh");
+        } else {
+            // A known database that's briefly unreadable, or a scan that failed.
+            wq_ls_note_failure(now, @"LaunchServices database not found");
+        }
+        return;
+    }
+    [NSUserDefaults.standardUserDefaults removeObjectForKey:kWQLSMissKey];
+
+    struct stat before;
+    if (!wq_ls_candidate_info(path, &before)) {
+        wq_ls_clear_snapshot_if_changed(currentChanged);
+        wq_ls_note_failure(now, wq_ls_error(path, @"candidate is no longer valid"));
+        return;
+    }
+    NSDictionary *beforeSignature = wq_ls_signature(&before);
+    BOOL snapshotChanged = !gLSLoaded || ![path isEqualToString:gLSStorePath] ||
+        !wq_ls_signature_equal(beforeSignature, gLSStoreSignature);
+    if (gLSLoaded && [path isEqualToString:gLSStorePath] &&
+        wq_ls_signature_equal(beforeSignature, gLSStoreSignature)) {
+        gLSFailureCount = 0;
+        gLSNextRetryAt = 0;
+        return;
+    }
+
+    NSString *error = nil;
+    NSData *data = wq_read(path, kWQLSMaxStoreBytes + 1, &error);
+    if (!data || data.length > kWQLSMaxStoreBytes) {
+        wq_ls_clear_snapshot_if_changed(snapshotChanged);
+        wq_ls_note_failure(now, wq_ls_error(path, error ?: @"store exceeds size limit"));
+        return;
+    }
+
+    NSDictionary *display = nil, *bundleName = nil, *containers = nil, *bundlePaths = nil;
+    if (!wq_parse_ls_store(data, &display, &bundleName, &containers, &bundlePaths)) {
+        wq_ls_clear_snapshot_if_changed(snapshotChanged);
+        wq_ls_note_failure(now, wq_ls_error(path, @"store rejected by bounded parser"));
+        return;
+    }
+
+    // Do not publish a snapshot that was changed while it was being read or parsed.
+    struct stat after;
+    if (!wq_ls_candidate_info(path, &after) || !wq_ls_stat_equal(&before, &after)) {
+        wq_ls_clear_snapshot_if_changed(snapshotChanged);
+        wq_ls_note_failure(now, wq_ls_error(path, @"store changed during read"));
+        return;
+    }
+
+    // Dictionaries are immutable copies and are assigned only after a complete,
+    // validated parse. Readers therefore see either the previous snapshot or this one.
+    gLSDisplay = [display copy] ?: @{};
+    gLSBundleName = [bundleName copy] ?: @{};
+    gLSContainers = [containers copy] ?: @{};
+    gLSBundlePaths = [bundlePaths copy] ?: @{};
+    gLSStorePath = [path copy];
+    gLSStoreSignature = [beforeSignature copy];
+    gLSLoaded = YES;
+    gLSFailureCount = 0;
+    gLSNextRetryAt = 0;
+    [NSUserDefaults.standardUserDefaults setObject:gLSStorePath forKey:kWQLSStoreKey];
+}
+
+// Apple's own apps and services: LaunchServices refuses this app on 27.x
+// (OSStatus -54) and /Applications is not listable, so names come from here.
+static NSDictionary<NSString *, NSString *> *wq_builtin_names(void)
+{
+    static NSDictionary *names;
+    static dispatch_once_t once;
+    dispatch_once(&once, ^{
+        names = @{
+            @"com.apple.AppStore": @"App Store", @"com.apple.mobilesafari": @"Safari", @"com.apple.weather": @"Weather",
+            @"com.apple.news": @"News", @"com.apple.stocks": @"Stocks", @"com.apple.mobilemail": @"Mail",
+            @"com.apple.MobileSMS": @"Messages", @"com.apple.mobilephone": @"Phone", @"com.apple.mobileslideshow": @"Photos",
+            @"com.apple.camera": @"Camera", @"com.apple.mobilecal": @"Calendar", @"com.apple.mobilenotes": @"Notes",
+            @"com.apple.reminders": @"Reminders", @"com.apple.Maps": @"Maps", @"com.apple.Music": @"Music",
+            @"com.apple.tv": @"TV", @"com.apple.podcasts": @"Podcasts", @"com.apple.iBooks": @"Books",
+            @"com.apple.Health": @"Health", @"com.apple.Passbook": @"Wallet", @"com.apple.Preferences": @"Settings",
+            @"com.apple.mobiletimer": @"Clock", @"com.apple.calculator": @"Calculator", @"com.apple.compass": @"Compass",
+            @"com.apple.VoiceMemos": @"Voice Memos", @"com.apple.facetime": @"FaceTime", @"com.apple.MobileAddressBook": @"Contacts",
+            @"com.apple.DocumentsApp": @"Files", @"com.apple.findmy": @"Find My", @"com.apple.Home": @"Home",
+            @"com.apple.shortcuts": @"Shortcuts", @"com.apple.Translate": @"Translate", @"com.apple.Fitness": @"Fitness",
+            @"com.apple.Bridge": @"Watch", @"com.apple.freeform": @"Freeform", @"com.apple.journal": @"Journal",
+            @"com.apple.Passwords": @"Passwords", @"com.apple.measure": @"Measure", @"com.apple.Magnifier": @"Magnifier",
+            @"com.apple.tips": @"Tips", @"com.apple.siri": @"Siri", @"com.apple.games": @"Games", @"com.apple.gamecenter": @"Game Center",
+            @"com.apple.Image-Playground": @"Image Playground", @"com.apple.Photos": @"Photos", @"com.apple.Keynote": @"Keynote",
+            @"com.apple.Pages": @"Pages", @"com.apple.Numbers": @"Numbers", @"com.apple.mobileme.fmip1": @"Find iPhone",
+            @"com.apple.store.Jolly": @"Apple Store", @"com.apple.supportapp": @"Apple Support", @"com.apple.Diagnostics": @"Diagnostics",
+            @"com.apple.PosterBoard": @"Wallpaper", @"com.apple.MercuryPoster": @"Wallpaper (Mercury)",
+            @"com.apple.WallpaperKit.CollectionsPoster": @"Wallpaper Collections",
+            @"com.apple.PhotosUIPrivate.PhotosPosterProvider": @"Photo Wallpaper",
+            @"com.apple.chrono.WidgetRenderer-Default": @"Widgets", @"com.apple.ScreenshotServicesService": @"Screenshots",
+            @"com.apple.Sharing.AirDrop": @"AirDrop", @"com.apple.AppleMediaServicesUI": @"Apple Media Services",
+            @"com.apple.AppleMediaServices": @"Apple Media Services", @"com.apple.ClarityCamera": @"Assistive Access Camera",
+            @"com.apple.ClarityPhotos": @"Assistive Access Photos", @"com.apple.SystemVoiceAssistant": @"Voice Assistant",
+            @"com.apple.ShazamEventsApp": @"Shazam", @"com.apple.ScreenTimeWidgetApplication": @"Screen Time",
+            @"com.apple.CBRemoteSetup": @"Remote Setup", @"com.apple.DemoApp": @"Demo", @"com.apple.AAUIViewService": @"Apple Account",
+            @"com.apple.AccountAuthenticationDialog": @"Account Sign-In", @"com.apple.StoreKitUISceneService": @"App Store Sheets",
+            @"com.apple.NewDeviceOutreachApp": @"New Device Setup", @"com.apple.PDUIApp": @"Printing", @"com.apple.EventViewService": @"Events",
+            @"com.apple.MXUIService": @"Media Picker", @"com.apple.ctkui": @"Smart Card", @"com.apple.InCallService": @"Call Screen",
+            @"com.apple.springboard": @"SpringBoard", @"com.apple.SafariViewService": @"Safari View", @"com.apple.mobilesms.compose": @"Message Compose",
+            @"com.apple.CompanionViewService": @"Companion", @"com.apple.musicrecognition": @"Music Recognition",
+            @"com.apple.FontInstallViewService": @"Font Install", @"com.apple.CMViewSrvc": @"Continuity Markup",
+            @"com.apple.AppleCashStickerPackHost": @"Apple Cash Stickers", @"com.apple.TVSetupUIService": @"Apple TV Setup",
+            @"com.apple.HearingApp": @"Hearing", @"com.apple.CompanionSetup": @"Companion Setup",
+            @"com.apple.CarPlayWallpaper": @"CarPlay Wallpaper", @"com.apple.CloudKit.ShareBear": @"iCloud Sharing",
+            @"com.apple.EnhancedLogging": @"Enhanced Logging", @"com.apple.tcc.AuthorizationPromptService": @"Privacy Prompts",
+            @"com.apple.WebContentFilter.remoteUI.WebContentAnalysisUI": @"Content Filter",
+            @"com.apple.SystemPaperViewService": @"Quick Note", @"com.apple.HeadphoneProxService": @"Headphones",
+            @"com.apple.datadetectors.DDActionsService": @"Data Detectors", @"com.apple.ServicesPaymentAngel": @"Apple Pay",
+            @"com.apple.HomeCaptiveViewService": @"Wi-Fi Login", @"com.apple.DiagnosticsService": @"Diagnostics",
+            @"com.apple.CarTirePressure": @"Tire Pressure", @"com.apple.FCAuthenticationUI": @"Authentication",
+            @"com.apple.icloud.FindMyDevice.FindMyExtensionContainer": @"Find My",
+            @"com.apple.messages.RemoteAlerts": @"Messages Alerts",
+            @"com.apple.AccessoryNotifications.SourceSelection": @"Accessory Source",
+            @"com.apple.printcenter": @"Print Center", @"com.apple.BarcodeScanner": @"Code Scanner",
+            @"com.apple.chrono.WidgetRenderer-Snapshots": @"Widget Snapshots",
+            @"com.apple.AMSEngagementViewService": @"Apple Media Services",
+            @"com.apple.appManagedFeatures.Restrictions": @"Restrictions", @"com.apple.CarRadio": @"Car Radio",
+            @"com.apple.PassbookUIService": @"Wallet Sheets", @"com.apple.Spotlight": @"Spotlight", @"com.apple.InputUI": @"Keyboard",
+        };
+    });
+    return names;
+}
+
+static NSString *wq_known_name_locked(NSString *bundleID)
+{
+    wq_load_ls_names_locked();
+    return gLSDisplay[bundleID] ?: wq_builtin_names()[bundleID] ?: gLSBundleName[bundleID];
+}
+
+BOOL wq_display_names_loaded(void)
+{
+    @synchronized (wq_ls_lock()) { return gLSLoaded; }
+}
+
+void wq_load_display_names(void)
+{
+    @synchronized (wq_ls_lock()) { wq_load_ls_names_locked(); }
+}
+
+void wq_display_names_reset_miss(void)
+{
+    @synchronized (wq_ls_lock()) {
+        [NSUserDefaults.standardUserDefaults removeObjectForKey:kWQLSMissKey];
+        gLSNextRetryAt = 0;
+        gLSFailureCount = 0;
+    }
+}
+
+static NSString *const kWQBundleContainerRoot = @"/private/var/containers/Bundle/Application/";
+
+// App bundle containers (<root>/<UUID>, holding Name.app) -> bundle id, built
+// from the bundle paths; rebuilt when a new database snapshot is published.
+static NSDictionary<NSString *, NSString *> *wq_bundle_containers_locked(void)
+{
+    static NSDictionary *source, *map;
+    wq_load_ls_names_locked();
+    if (map && source == gLSBundlePaths) return map;
+    NSMutableDictionary *built = [NSMutableDictionary new];
+    [gLSBundlePaths enumerateKeysAndObjectsUsingBlock:^(NSString *bid, NSString *path, BOOL *__unused stop) {
+        if (![bid isKindOfClass:NSString.class] || ![path isKindOfClass:NSString.class]) return;
+        NSString *app = path.stringByStandardizingPath;
+        if ([app hasPrefix:@"/var/"]) app = [@"/private" stringByAppendingString:app];
+        if (![app hasPrefix:kWQBundleContainerRoot] || ![app.pathExtension isEqualToString:@"app"]) return;
+        NSString *container = app.stringByDeletingLastPathComponent;
+        // Only <root>/<UUID>/Name.app: extensions and nested apps stay out.
+        if (![container.stringByDeletingLastPathComponent isEqualToString:
+              [kWQBundleContainerRoot substringToIndex:kWQBundleContainerRoot.length - 1]]) return;
+        if (!built[container] || bid.length < [built[container] length]) built[container] = bid;
+    }];
+    source = gLSBundlePaths;
+    map = [built copy];
+    return map;
+}
+
+NSString *wq_bundle_id_for_container(NSString *path)
+{
+    if (!path.length) return nil;
+    NSString *key = path.stringByStandardizingPath;
+    if ([key hasPrefix:@"/var/"]) key = [@"/private" stringByAppendingString:key];
+    @synchronized (wq_ls_lock()) {
+        wq_load_ls_names_locked();
+        NSString *bid = gLSContainers[key];
+        if (!bid && [key hasPrefix:kWQBundleContainerRoot]) bid = wq_bundle_containers_locked()[key];
+        return [bid isKindOfClass:NSString.class] ? bid : nil;
+    }
+}
+
+NSArray<NSString *> *wq_ls_bundle_containers(void)
+{
+    @synchronized (wq_ls_lock()) {
+        return [wq_bundle_containers_locked().allKeys sortedArrayUsingSelector:@selector(compare:)];
+    }
+}
+
+NSString *wq_display_name(NSString *bundleID)
+{
+    if (!bundleID) return nil;
+    @synchronized (wq_ls_lock()) {
+        NSString *name = wq_known_name_locked(bundleID);
+        if (name) return WQLocalized(name);
+        // Unknown id: use the closest parent app (com.apple.news.widget -> News).
+        NSArray *parts = [bundleID componentsSeparatedByString:@"."];
+        for (NSInteger n = (NSInteger)parts.count - 1; n >= 2; n--) {
+            NSString *prefix = [[parts subarrayWithRange:NSMakeRange(0, (NSUInteger)n)] componentsJoinedByString:@"."];
+            NSString *parent = wq_known_name_locked(prefix);
+            if (parent) {
+                NSString *suffix = wq_safe_name(parts.lastObject);
+                NSString *display = suffix.length ? [NSString stringWithFormat:@"%@ \u2013 %@", parent, suffix] : parent;
+                return WQLocalized(display);
+            }
+        }
+        return nil;
+    }
+}
+
+NSArray<NSString *> *wq_ls_container_paths(NSString *storeHint)
+{
+    // No lock and no scan here: the container scan calls this while a name
+    // load may be waiting for that scan.
+    NSUserDefaults *defaults = NSUserDefaults.standardUserDefaults;
+    NSString *path = storeHint.length ? storeHint : [defaults stringForKey:kWQLSStoreKey];
+    if (!path.length) return nil;
+    NSString *error = nil;
+    NSData *data = wq_read(path, kWQLSMaxStoreBytes + 1, &error);
+    if (!data || data.length > kWQLSMaxStoreBytes) {
+        wq_log(@"names: cannot read %@ (%@)", path, error ?: @"too large");
+        return nil;
+    }
+    NSDictionary *containers = nil;
+    if (!wq_parse_ls_store(data, NULL, NULL, &containers, NULL) || containers.count < 2) return nil;
+    if (storeHint.length) {
+        [defaults setObject:storeHint forKey:kWQLSStoreKey];
+        [defaults removeObjectForKey:kWQLSMissKey];
+    }
+    // App group containers aren't mapped to an owner here; the store lists
+    // the group containers of installed apps, which is what the list needs.
+    NSMutableSet<NSString *> *all = [NSMutableSet setWithArray:containers.allKeys];
+    static const char needle[] = "/mobile/Containers/Shared/AppGroup/";
+    const uint8_t *bytes = data.bytes, *cursor = bytes, *end = bytes + data.length;
+    while (cursor < end) {
+        const uint8_t *hit = memmem(cursor, (size_t)(end - cursor), needle, sizeof(needle) - 1);
+        if (!hit) break;
+        cursor = hit + sizeof(needle) - 1;
+        if ((size_t)(end - cursor) < 36) break;
+        NSString *uuid = [[NSString alloc] initWithBytes:cursor length:36 encoding:NSASCIIStringEncoding];
+        if (!uuid || ![[NSUUID alloc] initWithUUIDString:uuid]) continue;
+        [all addObject:[@"/private/var/mobile/Containers/Shared/AppGroup/" stringByAppendingString:uuid.uppercaseString]];
+    }
+    return all.allObjects;
+}
+
+NSString *wq_bundle_path_for_id(NSString *bundleID)
+{
+    if (!bundleID.length) return nil;
+    @synchronized (wq_ls_lock()) {
+        wq_load_ls_names_locked();
+        NSString *path = gLSBundlePaths[bundleID];
+        return [path isKindOfClass:NSString.class] ? path : nil;
+    }
+}

source/hook/src/WQLocalization.h

@@ -0,0 +1,18 @@
+//
+//  WQLocalization.h
+//  WQ Files
+//
+//  Shared runtime localization helpers. English source strings are the keys;
+//  zh-Hans.lproj supplies the Chinese translations and en.lproj is the
+//  identity fallback.
+//
+
+#import <Foundation/Foundation.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+NSString *WQLocalized(NSString *key);
+NSString *_Nullable WQLocalizedNullable(NSString *_Nullable text);
+NSString *WQLocalizedFormat(NSString *key, ...) NS_FORMAT_FUNCTION(1, 2);
+
+NS_ASSUME_NONNULL_END

source/hook/src/WQLocalization.m

@@ -0,0 +1,27 @@
+//
+//  WQLocalization.m
+//  WQ Files
+//
+
+#import "WQLocalization.h"
+
+NSString *WQLocalized(NSString *key)
+{
+    if (!key.length) return key;
+    return NSLocalizedString(key, nil);
+}
+
+NSString *WQLocalizedNullable(NSString *text)
+{
+    return text ? WQLocalized(text) : nil;
+}
+
+NSString *WQLocalizedFormat(NSString *key, ...)
+{
+    va_list args;
+    va_start(args, key);
+    NSString *format = WQLocalized(key);
+    NSString *text = [[NSString alloc] initWithFormat:format arguments:args];
+    va_end(args);
+    return text;
+}

source/hook/src/WQMediaStream.h

@@ -0,0 +1,35 @@
+//
+//  WQMediaStream.h
+//  WQ Files
+//
+//  Plays media from other apps' folders without copying them first. The
+//  player gets a custom URL; AVFoundation asks this object for byte ranges,
+//  which WQ Files reads itself (the media process has no access to those
+//  folders). If the item fails, onFailure runs once, so the caller can fall
+//  back to copying the file.
+//
+
+#import <AVFoundation/AVFoundation.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+typedef NSData *_Nullable (^WQMediaReadRange)(unsigned long long offset, NSUInteger length, NSString *_Nullable *_Nullable error);
+
+@interface WQMediaStream : NSObject <AVAssetResourceLoaderDelegate>
+
+// The type identifier the player is told for a file name ("public.mpeg-4"),
+// or nil when the extension isn't one that streams this way.
++ (nullable NSString *)contentTypeForFileName:(NSString *)name;
+
+// A player item that reads `size` bytes through `read`. The item keeps the
+// stream alive. onFailure (main queue) gets the reason once if the item fails.
++ (nullable AVPlayerItem *)playerItemForName:(NSString *)name size:(unsigned long long)size
+                                        read:(WQMediaReadRange)read
+                                   onFailure:(void (^)(NSString *reason))onFailure;
+
+// For tests: answers one data request range synchronously.
+- (nullable NSData *)dataForOffset:(unsigned long long)offset length:(NSUInteger)length error:(NSString *_Nullable *_Nullable)error;
+
+@end
+
+NS_ASSUME_NONNULL_END

source/hook/src/WQMediaStream.m

@@ -0,0 +1,134 @@
+//
+//  WQMediaStream.m
+//  WQ Files
+//
+
+#import "WQMediaStream.h"
+#import <UniformTypeIdentifiers/UniformTypeIdentifiers.h>
+#import <objc/runtime.h>
+
+static NSString *const kWQMediaScheme = @"wqmedia";
+static const NSUInteger kWQMediaChunk = 512 * 1024;
+static char kWQMediaStreamKey;
+
+@interface WQMediaStream ()
+@property (nonatomic, copy) NSString *contentType;
+@property (nonatomic) unsigned long long size;
+@property (nonatomic, copy) WQMediaReadRange read;
+@property (nonatomic, copy) void (^onFailure)(NSString *reason);
+@property (nonatomic, weak) AVPlayerItem *item;
+@property (nonatomic) BOOL failed;
+@end
+
+@implementation WQMediaStream {
+    dispatch_queue_t _readQueue;
+}
+
++ (NSString *)contentTypeForFileName:(NSString *)name
+{
+    NSString *ext = name.pathExtension.lowercaseString;
+    // Playlists reference other files; those can't be served from here.
+    if (!ext.length || [ext isEqualToString:@"m3u8"]) return nil;
+    UTType *type = [UTType typeWithFilenameExtension:ext];
+    if (!type || !([type conformsToType:UTTypeAudiovisualContent])) return nil;
+    return type.identifier;
+}
+
++ (AVPlayerItem *)playerItemForName:(NSString *)name size:(unsigned long long)size
+                               read:(WQMediaReadRange)read onFailure:(void (^)(NSString *))onFailure
+{
+    NSString *contentType = [self contentTypeForFileName:name];
+    if (!contentType || size == 0) return nil;
+    WQMediaStream *stream = [WQMediaStream new];
+    stream.contentType = contentType;
+    stream.size = size;
+    stream.read = read;
+    stream.onFailure = onFailure;
+    // The extension stays on the URL: AVFoundation also looks at it.
+    NSString *escaped = [name.lastPathComponent stringByAddingPercentEncodingWithAllowedCharacters:NSCharacterSet.URLPathAllowedCharacterSet];
+    NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:@"%@://media/%@", kWQMediaScheme, escaped ?: @"media"]];
+    if (!url) return nil;
+    AVURLAsset *asset = [AVURLAsset URLAssetWithURL:url options:nil];
+    [asset.resourceLoader setDelegate:stream queue:dispatch_queue_create("wq.media.loader", DISPATCH_QUEUE_SERIAL)];
+    AVPlayerItem *item = [AVPlayerItem playerItemWithAsset:asset];
+    stream.item = item;
+    // The resource loader holds its delegate weakly: the item keeps it.
+    objc_setAssociatedObject(item, &kWQMediaStreamKey, stream, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
+    [item addObserver:stream forKeyPath:@"status" options:NSKeyValueObservingOptionNew context:&kWQMediaStreamKey];
+    return item;
+}
+
+- (instancetype)init
+{
+    if ((self = [super init])) _readQueue = dispatch_queue_create("wq.media.read", DISPATCH_QUEUE_SERIAL);
+    return self;
+}
+
+- (void)dealloc
+{
+    @try { [_item removeObserver:self forKeyPath:@"status" context:&kWQMediaStreamKey]; } @catch (NSException *__unused e) {}
+}
+
+- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context
+{
+    if (context != &kWQMediaStreamKey) { [super observeValueForKeyPath:keyPath ofObject:object change:change context:context]; return; }
+    AVPlayerItem *item = object;
+    if (item.status != AVPlayerItemStatusFailed) return;
+    NSString *reason = item.error.localizedDescription ?: @"the player failed";
+    NSError *underlying = item.error.userInfo[NSUnderlyingErrorKey];
+    if (underlying) reason = [reason stringByAppendingFormat:@" (%@ %ld)", underlying.domain, (long)underlying.code];
+    dispatch_async(dispatch_get_main_queue(), ^{
+        if (self.failed) return;
+        self.failed = YES;
+        if (self.onFailure) self.onFailure(reason);
+    });
+}
+
+- (NSData *)dataForOffset:(unsigned long long)offset length:(NSUInteger)length error:(NSString **)error
+{
+    if (offset >= _size) return [NSData data];
+    unsigned long long left = _size - offset;
+    NSUInteger want = (NSUInteger)MIN((unsigned long long)length, left);
+    return _read(offset, want, error);
+}
+
+- (BOOL)resourceLoader:(AVAssetResourceLoader *)resourceLoader
+    shouldWaitForLoadingOfRequestedResource:(AVAssetResourceLoadingRequest *)request
+{
+    if (![request.request.URL.scheme isEqualToString:kWQMediaScheme]) return NO;
+    AVAssetResourceLoadingContentInformationRequest *info = request.contentInformationRequest;
+    if (info) {
+        info.contentType = _contentType;
+        info.contentLength = (long long)_size;
+        info.byteRangeAccessSupported = YES;
+    }
+    AVAssetResourceLoadingDataRequest *data = request.dataRequest;
+    if (!data) { [request finishLoading]; return YES; }
+    // Reads happen off the loader queue, in chunks, so a seek can cancel a
+    // long request between chunks.
+    dispatch_async(_readQueue, ^{
+        long long start = data.currentOffset;
+        long long end = data.requestsAllDataToEndOfResource ? (long long)self->_size
+                                                            : data.requestedOffset + (long long)data.requestedLength;
+        end = MIN(end, (long long)self->_size);
+        long long offset = start;
+        while (offset < end) {
+            if (request.isCancelled || request.isFinished) return;
+            NSUInteger length = (NSUInteger)MIN((long long)kWQMediaChunk, end - offset);
+            NSString *error = nil;
+            NSData *chunk = [self dataForOffset:(unsigned long long)offset length:length error:&error];
+            if (!chunk.length) {
+                if (request.isCancelled || request.isFinished) return;
+                [request finishLoadingWithError:[NSError errorWithDomain:@"WQMediaStream" code:1
+                    userInfo:@{NSLocalizedDescriptionKey: error ?: @"The file could not be read"}]];
+                return;
+            }
+            [data respondWithData:chunk];
+            offset += (long long)chunk.length;
+        }
+        if (!request.isCancelled && !request.isFinished) [request finishLoading];
+    });
+    return YES;
+}
+
+@end

source/hook/src/WQPlistEditor.h

@@ -0,0 +1,23 @@
+//
+//  WQPlistEditor.h
+//  WQ Files
+//
+//  Property list editor: browse dictionaries and arrays, edit values by type,
+//  add, delete, rename and reorder. Saves in the file's original format through
+//  wq_write_if_unchanged_get_version (backup first, verified contents).
+//
+
+#import <UIKit/UIKit.h>
+#import "WQEditing.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface WQPlistEditorViewController : UITableViewController <WQUnsavedEditing>
+// Loads `path` itself. openAsText / openAsHex (optional) switch to the other
+// viewers from the "Open As" menu.
+- (instancetype)initWithPath:(NSString *)path readOnly:(BOOL)readOnly;
+@property (nonatomic, copy, nullable) void (^openAsText)(void);
+@property (nonatomic, copy, nullable) void (^openAsHex)(void);
+@end
+
+NS_ASSUME_NONNULL_END

source/hook/src/WQPlistEditor.m

@@ -0,0 +1,738 @@
+//
+//  WQPlistEditor.m
+//  WQ Files
+//
+//  GPL-3.0-or-later.
+//
+
+#import "WQPlistEditor.h"
+#import "WQAccess.h"
+#import "WQCore.h"
+#import "WQUI.h"
+#import "WQPlistEditorSupport.h"
+
+typedef NS_ENUM(NSInteger, WQPType) {
+    WQPTypeString, WQPTypeInteger, WQPTypeReal, WQPTypeBoolean, WQPTypeDate, WQPTypeData,
+    WQPTypeDictionary, WQPTypeArray, WQPTypeUID, WQPTypeUnknown,
+};
+
+static WQPType wqp_type(id v)
+{
+    if ([v isKindOfClass:NSString.class]) return WQPTypeString;
+    if ([v isKindOfClass:NSNumber.class]) {
+        if (CFGetTypeID((__bridge CFTypeRef)v) == CFBooleanGetTypeID()) return WQPTypeBoolean;
+        return CFNumberIsFloatType((__bridge CFNumberRef)v) ? WQPTypeReal : WQPTypeInteger;
+    }
+    if ([v isKindOfClass:NSDate.class]) return WQPTypeDate;
+    if ([v isKindOfClass:NSData.class]) return WQPTypeData;
+    if ([v isKindOfClass:NSDictionary.class]) return WQPTypeDictionary;
+    if ([v isKindOfClass:NSArray.class]) return WQPTypeArray;
+    if (WQPlistIsKeyedArchiveUID(v)) return WQPTypeUID;
+    return WQPTypeUnknown;
+}
+
+static NSString *wqp_type_name(WQPType t)
+{
+    switch (t) {
+        case WQPTypeString: return WQLocalized(@"String");
+        case WQPTypeInteger: return WQLocalized(@"Number");
+        case WQPTypeReal: return WQLocalized(@"Real");
+        case WQPTypeBoolean: return WQLocalized(@"Boolean");
+        case WQPTypeDate: return WQLocalized(@"Date");
+        case WQPTypeData: return WQLocalized(@"Data");
+        case WQPTypeDictionary: return WQLocalized(@"Dictionary");
+        case WQPTypeArray: return WQLocalized(@"Array");
+        case WQPTypeUID: return WQLocalized(@"Reference");
+        case WQPTypeUnknown: return @"?";
+    }
+    return @"?";
+}
+
+static NSString *wqp_hex(NSData *data, NSUInteger max)
+{
+    const uint8_t *b = data.bytes;
+    NSUInteger n = MIN(data.length, max);
+    NSMutableString *s = [NSMutableString stringWithCapacity:n * 3];
+    for (NSUInteger i = 0; i < n; i++) [s appendFormat:i ? @" %02x" : @"%02x", b[i]];
+    if (data.length > max) [s appendString:@" …"];
+    return s;
+}
+
+static NSISO8601DateFormatter *wqp_dates(void)
+{
+    static NSISO8601DateFormatter *f;
+    static dispatch_once_t once;
+    dispatch_once(&once, ^{ f = [NSISO8601DateFormatter new]; });
+    return f;
+}
+
+static NSString *wqp_summary(id v)
+{
+    switch (wqp_type(v)) {
+        case WQPTypeString: return WQLocalized(WQPBoundedStringPreview(v));
+        case WQPTypeInteger: case WQPTypeReal: return [v stringValue];
+        case WQPTypeBoolean: return [v boolValue] ? WQLocalized(@"YES") : WQLocalized(@"NO");
+        case WQPTypeDate: return [wqp_dates() stringFromDate:v];
+        case WQPTypeData: return WQLocalizedFormat(@"%lu bytes · %@", (unsigned long)[v length], wqp_hex(v, 24));
+        case WQPTypeDictionary: return WQLocalizedFormat(@"%lu keys", (unsigned long)[v count]);
+        case WQPTypeArray: return WQLocalizedFormat(@"%lu items", (unsigned long)[v count]);
+        case WQPTypeUID: return WQLocalized(@"keyed-archive reference");
+        case WQPTypeUnknown: return WQPBoundedStringPreview([v description]);
+    }
+    return @"";
+}
+
+static NSString *wqp_scalar_text(id value, WQPType t)
+{
+    if (t == WQPTypeData) return wqp_hex(value, WQPMaxDataBytes);
+    if (t == WQPTypeDate) return [wqp_dates() stringFromDate:value];
+    if ([value isKindOfClass:NSString.class]) return value;
+    if ([value isKindOfClass:NSNumber.class]) return [value stringValue];
+    return @"";
+}
+
+static id wqp_default(WQPType t)
+{
+    switch (t) {
+        case WQPTypeString: return @"";
+        case WQPTypeInteger: return @0;
+        case WQPTypeReal: return @0.0;
+        case WQPTypeBoolean: return @NO;
+        case WQPTypeDate: return NSDate.date;
+        case WQPTypeData: return [NSData data];
+        case WQPTypeDictionary: return [NSMutableDictionary dictionary];
+        case WQPTypeArray: return [NSMutableArray array];
+        case WQPTypeUID: return @"";
+        case WQPTypeUnknown: return @"";
+    }
+    return @"";
+}
+
+static void wqp_alert(UIViewController *host, NSString *title, NSString *message)
+{
+    UIAlertController *a = wq_alert_controller(title, message, UIAlertControllerStyleAlert);
+    [a addAction:wq_alert_action(@"OK", UIAlertActionStyleDefault, nil)];
+    [host presentViewController:a animated:YES completion:nil];
+}
+
+#pragma mark - Document
+
+@interface WQPlistDocument : NSObject
+@property (nonatomic, copy) NSString *path;
+@property (nonatomic, strong) id root;
+@property (nonatomic) NSPropertyListFormat format;
+@property (nonatomic) BOOL readOnly;
+@property (nonatomic, strong) WQEditState *edit;
+@property (nonatomic, strong) NSDictionary<NSString *, NSNumber *> *version;
+@end
+
+@implementation WQPlistDocument
+@end
+
+#pragma mark - Editor
+
+@interface WQPlistEditorViewController ()
+@property (nonatomic, strong) WQPlistDocument *doc;
+@property (nonatomic, strong) id container;   // NSMutableDictionary or NSMutableArray
+@property (nonatomic, copy) NSArray *keys;    // sorted keys (dictionary) or nil (array)
+@property (nonatomic, copy) NSString *status; // loading / error text
+@property (nonatomic) BOOL isRoot;
+@end
+
+@implementation WQPlistEditorViewController {
+    NSArray *_sortedKeyCache;
+    BOOL _keysDirty;
+}
+
+- (instancetype)initWithPath:(NSString *)path readOnly:(BOOL)readOnly
+{
+    if ((self = [super initWithStyle:UITableViewStyleInsetGrouped])) {
+        _doc = [WQPlistDocument new];
+        _doc.path = path;
+        _doc.readOnly = readOnly;
+        _doc.edit = [WQEditState new];
+        _isRoot = YES;
+        _status = WQLocalized(@"Loading…");
+        self.title = path.lastPathComponent;
+    }
+    return self;
+}
+
+- (instancetype)initWithDocument:(WQPlistDocument *)doc container:(id)container title:(NSString *)title
+{
+    if ((self = [super initWithStyle:UITableViewStyleInsetGrouped])) {
+        _doc = doc;
+        _container = container;
+        self.title = title;
+    }
+    return self;
+}
+
+- (void)viewDidLoad
+{
+    [super viewDidLoad];
+    self.navigationItem.largeTitleDisplayMode = UINavigationItemLargeTitleDisplayModeNever;
+    __weak typeof(self) weakSelf = self;
+    if (self.isRoot) {
+        self.navigationItem.backAction = [UIAction actionWithHandler:^(UIAction *__unused a) { [weakSelf leave]; }];
+        [self load];
+    } else {
+        self.navigationItem.backAction = [UIAction actionWithHandler:^(UIAction *__unused a) {
+            if ([weakSelf blockWhileSaving]) return;
+            [weakSelf.navigationController popViewControllerAnimated:YES];
+        }];
+    }
+    [self updateBar];
+}
+
+- (void)viewWillAppear:(BOOL)animated
+{
+    [super viewWillAppear:animated];
+    [self refresh];
+}
+
+- (void)load
+{
+    NSString *path = self.doc.path;
+    dispatch_async(dispatch_get_global_queue(QOS_CLASS_USER_INITIATED, 0), ^{
+        NSString *error = nil;
+        NSDictionary *__unused before = wq_file_version(path);
+        NSData *data = wq_read(path, WQPMaxSerializedBytes, &error);
+        NSDictionary *version = wq_file_version(path);
+        if (data && (!before || ![before isEqualToDictionary:version])) {
+            data = nil;
+            error = WQLocalized(@"The file changed while it was being read. Open it again.");
+        }
+        NSPropertyListFormat format = NSPropertyListBinaryFormat_v1_0;
+        NSError *parseError = nil;
+        id root = data ? [NSPropertyListSerialization propertyListWithData:data
+                                                                  options:NSPropertyListMutableContainersAndLeaves
+                                                                   format:&format error:&parseError] : nil;
+        dispatch_async(dispatch_get_main_queue(), ^{
+            self.doc.version = version;
+            if (!root) {
+                self.status = data ? WQLocalizedFormat(@"Not a property list: %@", parseError.localizedDescription)
+                                   : (wq_permission_hint(path, NO) ?: WQLocalizedFormat(@"Cannot read this file: %@", error));
+            } else if (![root isKindOfClass:NSMutableDictionary.class] && ![root isKindOfClass:NSMutableArray.class]) {
+                // A plist whose root is a single value: wrap it for display only.
+                self.doc.format = format;
+                self.doc.root = root;
+                self.doc.readOnly = YES;
+                self.container = [NSMutableArray arrayWithObject:root];
+                self.status = nil;
+            } else {
+                if (wq_permission_hint(path, YES)) self.doc.readOnly = YES;   // readable, but only the owner may write
+                if (!WQPlistFormatIsWritable(format)) self.doc.readOnly = YES; // OpenStep/unknown format
+                self.doc.root = root;
+                self.doc.format = format;
+                self.container = root;
+                self.status = nil;
+            }
+            [self refresh];
+        });
+    });
+}
+
+- (void)refresh
+{
+    if ([self.container isKindOfClass:NSDictionary.class]) {
+        if (!_sortedKeyCache || _keysDirty) {
+            _sortedKeyCache = [[self.container allKeys] sortedArrayUsingSelector:@selector(localizedStandardCompare:)];
+            _keysDirty = NO;
+        }
+        self.keys = _sortedKeyCache;
+    } else {
+        self.keys = nil;
+        _sortedKeyCache = nil;
+        _keysDirty = NO;
+    }
+    [self updateBar];
+    [self.tableView reloadData];
+}
+
+- (BOOL)isArray
+{
+    return [self.container isKindOfClass:NSArray.class];
+}
+
+- (void)updateBar
+{
+    NSMutableArray *items = [NSMutableArray array];
+    if (!self.doc.readOnly && self.container) {
+        UIBarButtonItem *save = [[UIBarButtonItem alloc] initWithTitle:WQLocalizedNullable(@"Save") style:wq_primary_button_style()
+                                                                target:self action:@selector(save)];
+        save.enabled = self.doc.edit.dirty && !self.doc.edit.saving;
+        [items addObject:save];
+        UIBarButtonItem *add = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAdd
+                                                                              target:self action:@selector(add)];
+        add.enabled = !self.doc.edit.saving;
+        [items addObject:add];
+    }
+    NSMutableArray *menu = [NSMutableArray array];
+    __weak typeof(self) weakSelf = self;
+    if (self.isArray && !self.doc.readOnly && !self.doc.edit.saving && self.container) {
+        [menu addObject:[UIAction actionWithTitle:WQLocalizedNullable(self.tableView.editing ? @"Done Reordering" : @"Reorder Items")
+                                            image:[UIImage systemImageNamed:@"arrow.up.arrow.down"] identifier:nil
+                                          handler:^(UIAction *__unused a) {
+            [weakSelf.tableView setEditing:!weakSelf.tableView.editing animated:YES];
+            [weakSelf updateBar];
+        }]];
+    }
+    if (self.openAsText) [menu addObject:[UIAction actionWithTitle:WQLocalizedNullable(@"Open as XML Text") image:[UIImage systemImageNamed:@"doc.plaintext"]
+                                                         identifier:nil handler:^(UIAction *__unused a) { [weakSelf leaveThen:weakSelf.openAsText]; }]];
+    if (self.openAsHex) [menu addObject:[UIAction actionWithTitle:WQLocalizedNullable(@"Open in Hex Viewer") image:[UIImage systemImageNamed:@"number"]
+                                                        identifier:nil handler:^(UIAction *__unused a) { [weakSelf leaveThen:weakSelf.openAsHex]; }]];
+    if (menu.count)
+        [items addObject:[[UIBarButtonItem alloc] initWithImage:[UIImage systemImageNamed:@"ellipsis.circle"]
+                                                           menu:[UIMenu menuWithChildren:menu]]];
+    self.navigationItem.rightBarButtonItems = items;
+}
+
+#pragma mark Leaving and saving
+
+- (BOOL)wq_needsLeaveConfirmation
+{
+    // Ordinary dirty child navigation keeps the shared edits, but no editor
+    // may leave while the shared document is being written.
+    return self.doc.edit.saving || (self.isRoot && self.doc.edit.dirty);
+}
+
+- (void)leave
+{
+    [self leaveThen:nil];
+}
+
+- (BOOL)blockWhileSaving
+{
+    if (!self.doc.edit.saving) return NO;
+    wqp_alert(self, @"Save in progress", @"Wait for the current save to finish before leaving or making more changes.");
+    return YES;
+}
+
+// Asks before throwing away unsaved changes, then pops to the folder and runs `then`.
+- (void)leaveThen:(void (^)(void))then
+{
+    if ([self blockWhileSaving]) return;
+    UINavigationController *nav = self.navigationController;
+    NSUInteger rootIndex = [nav.viewControllers indexOfObjectPassingTest:^BOOL(UIViewController *vc, NSUInteger __unused i, BOOL *__unused stop) {
+        return [vc isKindOfClass:WQPlistEditorViewController.class] && ((WQPlistEditorViewController *)vc).isRoot &&
+               ((WQPlistEditorViewController *)vc).doc == self.doc;
+    }];
+    void (^go)(void) = ^{
+        if (rootIndex != NSNotFound && rootIndex > 0)
+            [nav popToViewController:nav.viewControllers[rootIndex - 1] animated:then == nil];
+        if (then) then();
+    };
+    if (!self.doc.edit.dirty) { go(); return; }
+    UIAlertController *a = wq_alert_controller(@"Discard changes?", @"Your edits to this property list have not been saved.", UIAlertControllerStyleAlert);
+    [a addAction:wq_alert_action(@"Keep Editing", UIAlertActionStyleCancel, nil)];
+    [a addAction:wq_alert_action(@"Discard", UIAlertActionStyleDestructive, ^(UIAlertAction *__unused x) {
+        [self.doc.edit discard];
+        go();
+    })];
+    [self presentViewController:a animated:YES completion:nil];
+}
+
+// Home button: ask before throwing away unsaved changes.
+- (void)confirmLeaveThen:(void (^)(void))proceed
+{
+    if ([self blockWhileSaving]) return;
+    if (!self.doc.edit.dirty) { proceed(); return; }
+    UIAlertController *a = wq_alert_controller(@"Discard changes?", @"Your edits to this property list have not been saved.", UIAlertControllerStyleAlert);
+    [a addAction:wq_alert_action(@"Keep Editing", UIAlertActionStyleCancel, nil)];
+    [a addAction:wq_alert_action(@"Discard", UIAlertActionStyleDestructive, ^(UIAlertAction *__unused x) {
+        [self.doc.edit discard];
+        proceed();
+    })];
+    [self presentViewController:a animated:YES completion:nil];
+}
+
+- (void)save
+{
+    if ([self blockWhileSaving] || self.doc.readOnly || !self.doc.edit.dirty) return;
+    WQPlistDocument *doc = self.doc;
+    if (!WQPlistFormatIsWritable(doc.format)) {
+        wqp_alert(self, @"Read-only format", @"This property list uses an OpenStep/unknown format that cannot be saved by the editor. Use Open as XML Text and choose a supported format explicitly.");
+        return;
+    }
+    if (!doc.version) {
+        wqp_alert(self, @"Cannot save safely", @"The current file version is unavailable. Reopen the file before saving again.");
+        return;
+    }
+    NSString *fmt = WQLocalized(WQPlistFormatName(doc.format));
+    UIAlertController *a = wq_alert_controller(@"Save changes?", WQLocalizedFormat(@"%@ is overwritten in place (%@ format). The current version is backed up first.", doc.path, fmt), UIAlertControllerStyleAlert);
+    [a addAction:wq_alert_action(@"Cancel", UIAlertActionStyleCancel, nil)];
+    [a addAction:wq_alert_action(@"Save", UIAlertActionStyleDestructive, ^(UIAlertAction *__unused x) {
+        NSUInteger savedRevision = [doc.edit beginSave];
+        NSDictionary *expectedVersion = [doc.version copy];
+        NSString *path = [doc.path copy];
+        NSPropertyListFormat format = doc.format;
+        id root = doc.root;
+        UINavigationController *navigationController = self.navigationController;
+        __weak WQPlistEditorViewController *weakSelf = self;
+        [self refresh];
+        dispatch_async(dispatch_get_global_queue(QOS_CLASS_USER_INITIATED, 0), ^{
+            NSError *serializationError = nil;
+            NSString *writeError = nil;
+            BOOL ok = NO;
+            NSDictionary *savedVersion = nil;
+            NSString *copyError = nil;
+            id snapshot = WQPlistImmutableCopy(root, &copyError);
+            NSData *data = snapshot ? [NSPropertyListSerialization dataWithPropertyList:snapshot
+                                                                                     format:format
+                                                                                    options:0
+                                                                                      error:&serializationError] : nil;
+            if (!snapshot) {
+                writeError = copyError ?: WQLocalized(@"The edited property list contains an unsupported value.");
+            } else if (!data) {
+                writeError = serializationError.localizedDescription ?: WQLocalized(@"The edited property list is not valid.");
+            } else if (!WQPSerializedDataWithinLimit(data)) {
+                writeError = WQLocalizedFormat(@"The serialized property list is too large (maximum %lu MiB).", (unsigned long)(WQPMaxSerializedBytes / (1024 * 1024)));
+            } else {
+                NSError *validationError = nil;
+                id check = [NSPropertyListSerialization propertyListWithData:data
+                                                                        options:NSPropertyListImmutable
+                                                                         format:NULL
+                                                                          error:&validationError];
+                if (!check) {
+                    writeError = validationError.localizedDescription ?: WQLocalized(@"The serialized property list could not be validated.");
+                } else {
+                    ok = wq_write_if_unchanged_get_version(path, data, expectedVersion, &savedVersion, &writeError);
+                }
+            }
+            dispatch_async(dispatch_get_main_queue(), ^{
+                [doc.edit finishSave:ok revision:savedRevision];
+                // Returned while the saved bytes were verified on the locked
+                // descriptor; a later external change is rejected next save.
+                if (ok) doc.version = savedVersion;
+
+                WQPlistEditorViewController *origin = weakSelf;
+                UINavigationController *nav = navigationController ?: origin.navigationController;
+                WQPlistEditorViewController *visible = nil;
+                for (UIViewController *controller in nav.viewControllers) {
+                    if (![controller isKindOfClass:WQPlistEditorViewController.class]) continue;
+                    WQPlistEditorViewController *editor = (WQPlistEditorViewController *)controller;
+                    if (editor.doc != doc) continue;
+                    [editor refresh];
+                    if (controller == nav.visibleViewController) visible = editor;
+                }
+                if (!visible && origin.doc == doc) {
+                    [origin refresh];
+                    if (origin.viewIfLoaded.window) visible = origin;
+                }
+                if (!ok && visible.viewIfLoaded.window) {
+                    NSString *hint = wq_permission_hint(path, YES);
+                    wqp_alert(visible, @"Save failed", hint ?: writeError ?: @"Unknown error");
+                }
+            });
+        });
+    })];
+    [self presentViewController:a animated:YES completion:nil];
+}
+
+- (void)changed
+{
+    if (self.doc.readOnly || self.doc.edit.saving) return;
+    // Callers have already changed the data. Record it even during a save: the
+    // newer revision keeps the document dirty when that save finishes. The
+    // guard above also protects stale UI callbacks from changing readonly or
+    // frozen documents.
+    _keysDirty = YES;
+    [self.doc.edit noteChange];
+    [self refresh];
+}
+
+#pragma mark Table
+
+- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
+{
+    return self.status ? 0 : (NSInteger)[self.container count];
+}
+
+- (NSString *)tableView:(UITableView *)tableView titleForFooterInSection:(NSInteger)section
+{
+    if (self.status) return self.status;
+    if (!self.isRoot) return nil;
+    NSString *fmt = WQLocalized(WQPlistFormatName(self.doc.format));
+    if (self.doc.readOnly) {
+        NSString *reason = WQPlistFormatIsWritable(self.doc.format) ? WQLocalized(@"read only") : WQLocalized(@"read only · writing is not supported");
+        return WQLocalizedFormat(@"%@ property list · %@", fmt, reason);
+    }
+    return WQLocalizedFormat(@"%@ property list. Tap a value to edit it, swipe to delete or rename, + to add.", fmt);
+}
+
+- (id)keyAt:(NSInteger)row
+{
+    return self.isArray ? @(row) : self.keys[(NSUInteger)row];
+}
+
+- (id)valueAt:(NSInteger)row
+{
+    return self.isArray ? self.container[(NSUInteger)row] : self.container[self.keys[(NSUInteger)row]];
+}
+
+- (void)setValue:(id)value at:(NSInteger)row
+{
+    if (self.doc.readOnly || self.doc.edit.saving) return;
+    if (self.isArray) self.container[(NSUInteger)row] = value;
+    else self.container[self.keys[(NSUInteger)row]] = value;
+}
+
+- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
+{
+    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"plist"];
+    if (!cell) cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"plist"];
+    cell.accessoryView = nil;
+    cell.accessoryType = UITableViewCellAccessoryNone;
+    cell.selectionStyle = UITableViewCellSelectionStyleDefault;
+    UIListContentConfiguration *c = [UIListContentConfiguration subtitleCellConfiguration];
+    id value = [self valueAt:indexPath.row];
+    WQPType t = wqp_type(value);
+    c.text = self.isArray ? WQLocalizedFormat(@"Item %ld", (long)indexPath.row) : [self keyAt:indexPath.row];
+    c.secondaryText = WQLocalizedFormat(@"%@ · %@", wqp_type_name(t), wqp_summary(value));
+    c.secondaryTextProperties.numberOfLines = 3;
+    c.secondaryTextProperties.color = UIColor.secondaryLabelColor;
+    if (t == WQPTypeDictionary || t == WQPTypeArray) {
+        cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
+    } else if (t == WQPTypeBoolean) {
+        UISwitch *sw = [UISwitch new];
+        sw.on = [value boolValue];
+        sw.enabled = !self.doc.readOnly && !self.doc.edit.saving;
+        sw.tag = indexPath.row;
+        [sw addTarget:self action:@selector(boolChanged:) forControlEvents:UIControlEventValueChanged];
+        cell.accessoryView = sw;
+        cell.selectionStyle = UITableViewCellSelectionStyleNone;
+    }
+    cell.contentConfiguration = c;
+    return cell;
+}
+
+- (void)boolChanged:(UISwitch *)sw
+{
+    if (self.doc.readOnly || self.doc.edit.saving) {
+        sw.on = [[self valueAt:sw.tag] boolValue];
+        return;
+    }
+    [self setValue:@(sw.on) at:sw.tag];
+    [self changed];
+}
+
+- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
+{
+    [tableView deselectRowAtIndexPath:indexPath animated:YES];
+    if (self.doc.edit.saving) return;
+    id value = [self valueAt:indexPath.row];
+    WQPType t = wqp_type(value);
+    NSString *name = self.isArray ? WQLocalizedFormat(@"Item %ld", (long)indexPath.row) : [self keyAt:indexPath.row];
+    if (t == WQPTypeDictionary || t == WQPTypeArray) {
+        WQPlistEditorViewController *child = [[WQPlistEditorViewController alloc] initWithDocument:self.doc container:value title:name];
+        [self.navigationController pushViewController:child animated:YES];
+        return;
+    }
+    if (t == WQPTypeUID) {
+        wqp_alert(self, @"Reference value", @"Keyed-archive references are read-only in this editor. Edit the archived data through its owning key instead.");
+        return;
+    }
+    if (t == WQPTypeBoolean || self.doc.readOnly || self.doc.edit.saving) return;
+    NSInteger row = indexPath.row;
+    [self editValueOfType:t current:value title:name done:^(id newValue) {
+        [self setValue:newValue at:row];
+        [self changed];
+    }];
+}
+
+// Asks for a scalar value of type `t`; `done` gets the parsed value.
+- (void)editValueOfType:(WQPType)t current:(id)current title:(NSString *)title done:(void (^)(id value))done
+{
+    if (self.doc.readOnly || self.doc.edit.saving) return;
+    if (t == WQPTypeUID) return;
+    if (t == WQPTypeData && [current length] > WQPMaxDataBytes) {
+        wqp_alert(self, @"Too large to edit here", @"Data over 4 KB can't be edited in this editor.");
+        return;
+    }
+    if (t == WQPTypeString && [current length] > WQPMaxStringInputCharacters) {
+        wqp_alert(self, @"Too large to edit here", @"Strings over 64 KB can't be edited in this editor.");
+        return;
+    }
+    NSString *hint = nil;
+    switch (t) {
+        case WQPTypeInteger: hint = WQLocalized(@"Whole number"); break;
+        case WQPTypeReal: hint = WQLocalized(@"Number"); break;
+        case WQPTypeDate: hint = WQLocalized(@"ISO 8601, e.g. 2026-11-09T15:00:00Z"); break;
+        case WQPTypeData: hint = WQLocalized(@"Hex bytes, e.g. 01 ab ff"); break;
+        default: break;
+    }
+    UIAlertController *a = wq_alert_controller(title, [wqp_type_name(t) stringByAppendingString:hint ? [@" · " stringByAppendingString:hint] : @""], UIAlertControllerStyleAlert);
+    [a addTextFieldWithConfigurationHandler:^(UITextField *f) {
+        f.text = wqp_scalar_text(current, t);
+        f.autocapitalizationType = UITextAutocapitalizationTypeNone;
+        f.autocorrectionType = UITextAutocorrectionTypeNo;
+        f.clearButtonMode = UITextFieldViewModeAlways;
+        if (t == WQPTypeInteger) f.keyboardType = UIKeyboardTypeNumbersAndPunctuation;
+        if (t == WQPTypeReal) f.keyboardType = UIKeyboardTypeDecimalPad;
+    }];
+    [a addAction:wq_alert_action(@"Cancel", UIAlertActionStyleCancel, nil)];
+    [a addAction:wq_alert_action(@"Set", UIAlertActionStyleDefault, ^(UIAlertAction *__unused x) {
+        NSString *text = a.textFields.firstObject.text ?: @"";
+        id value = nil;
+        if (t != WQPTypeData && !WQPStringInputWithinLimit(text)) {
+            wqp_alert(self, @"Value too large", @"Scalar values are limited to 64 KB in this editor.");
+            return;
+        }
+        if (t == WQPTypeData && !WQPDataInputWithinLimit(text)) {
+            wqp_alert(self, @"Value too large", @"Hex input is limited to 16 KB in this editor.");
+            return;
+        }
+        switch (t) {
+            case WQPTypeString: value = text; break;
+            case WQPTypeInteger: {
+                NSScanner *sc = [NSScanner scannerWithString:text];
+                long long n;
+                if ([sc scanLongLong:&n] && sc.isAtEnd) value = @(n);
+                break;
+            }
+            case WQPTypeReal: {
+                NSScanner *sc = [NSScanner scannerWithString:text];
+                double d;
+                if ([sc scanDouble:&d] && sc.isAtEnd) value = @(d);
+                break;
+            }
+            case WQPTypeDate: value = [wqp_dates() dateFromString:text]; break;
+            case WQPTypeData: {
+                NSData *data = WQParseHex(text, YES);
+                if (data.length > WQPMaxDataBytes) {
+                    wqp_alert(self, @"Value too large", @"Data values are limited to 4 KB in this editor.");
+                    return;
+                }
+                value = data;
+                break;
+            }
+            default: break;
+        }
+        if (!value) { wqp_alert(self, @"Not a valid value", WQLocalizedFormat(@"Expected: %@", hint ?: wqp_type_name(t))); return; }
+        done(value);
+    })];
+    [self presentViewController:a animated:YES completion:nil];
+}
+
+#pragma mark Adding, deleting, renaming, moving
+
+- (void)add
+{
+    if (self.doc.readOnly || self.doc.edit.saving) return;
+    UIAlertController *sheet = wq_alert_controller(@"Add", @"Type of the new value", UIAlertControllerStyleActionSheet);
+    for (WQPType t = WQPTypeString; t <= WQPTypeArray; t++) {
+        [sheet addAction:wq_alert_action(wqp_type_name(t), UIAlertActionStyleDefault, ^(UIAlertAction *__unused x) {
+            [self addValueOfType:t];
+        })];
+    }
+    [sheet addAction:wq_alert_action(@"Cancel", UIAlertActionStyleCancel, nil)];
+    sheet.popoverPresentationController.barButtonItem = self.navigationItem.rightBarButtonItems.count > 1
+        ? self.navigationItem.rightBarButtonItems[1] : self.navigationItem.rightBarButtonItems.firstObject;
+    [self presentViewController:sheet animated:YES completion:nil];
+}
+
+- (void)addValueOfType:(WQPType)t
+{
+    if (self.doc.readOnly || self.doc.edit.saving) return;
+    void (^insert)(NSString *key) = ^(NSString *key) {
+        if (self.doc.readOnly || self.doc.edit.saving) return;
+        id value = wqp_default(t);
+        void (^put)(id) = ^(id v) {
+            if (self.doc.readOnly || self.doc.edit.saving) return;
+            if (self.isArray) {
+                [self.container addObject:v];
+            } else {
+                if (!key.length) return;  // dictionary insertion always has a validated key
+                NSMutableDictionary *dictionary = self.container;
+                dictionary[key] = v;
+            }
+            [self changed];
+        };
+        if (t == WQPTypeDictionary || t == WQPTypeArray || t == WQPTypeBoolean) { put(value); return; }
+        [self editValueOfType:t current:value title:key ?: @"New Item" done:put];
+    };
+    if (self.isArray) { insert(nil); return; }
+    [self askKey:nil title:WQLocalizedNullable(@"Key") done:insert];
+}
+
+- (void)askKey:(NSString *)current title:(NSString *)title done:(void (^)(NSString *key))done
+{
+    if (self.doc.readOnly || self.doc.edit.saving) return;
+    UIAlertController *a = wq_alert_controller(title, nil, UIAlertControllerStyleAlert);
+    [a addTextFieldWithConfigurationHandler:^(UITextField *f) {
+        f.text = current;
+        f.placeholder = WQLocalizedNullable(@"Key");
+        f.autocapitalizationType = UITextAutocapitalizationTypeNone;
+        f.autocorrectionType = UITextAutocorrectionTypeNo;
+    }];
+    [a addAction:wq_alert_action(@"Cancel", UIAlertActionStyleCancel, nil)];
+    [a addAction:wq_alert_action(@"OK", UIAlertActionStyleDefault, ^(UIAlertAction *__unused x) {
+        NSString *key = a.textFields.firstObject.text ?: @"";
+        if (key.length == 0) return;
+        if (![key isEqualToString:current] && self.container[key]) {
+            wqp_alert(self, @"Key exists", WQLocalizedFormat(@"There is already a key named \"%@\".", key));
+            return;
+        }
+        done(key);
+    })];
+    [self presentViewController:a animated:YES completion:nil];
+}
+
+- (UISwipeActionsConfiguration *)tableView:(UITableView *)tableView
+    trailingSwipeActionsConfigurationForRowAtIndexPath:(NSIndexPath *)indexPath
+{
+    if (self.doc.readOnly || self.doc.edit.saving) return nil;
+    NSInteger row = indexPath.row;
+    UIContextualAction *del = [UIContextualAction contextualActionWithStyle:UIContextualActionStyleDestructive title:WQLocalizedNullable(@"Delete")
+        handler:^(UIContextualAction *__unused action, UIView *__unused view, void (^completion)(BOOL)) {
+        if (self.doc.readOnly || self.doc.edit.saving) { completion(NO); return; }
+        if (self.isArray) [self.container removeObjectAtIndex:(NSUInteger)row];
+        else [self.container removeObjectForKey:self.keys[(NSUInteger)row]];
+        [self changed];
+        completion(YES);
+    }];
+    if (self.isArray) return [UISwipeActionsConfiguration configurationWithActions:@[del]];
+    UIContextualAction *rename = [UIContextualAction contextualActionWithStyle:UIContextualActionStyleNormal title:WQLocalizedNullable(@"Rename")
+        handler:^(UIContextualAction *__unused action, UIView *__unused view, void (^completion)(BOOL)) {
+        if (self.doc.readOnly || self.doc.edit.saving) { completion(NO); return; }
+        NSString *old = self.keys[(NSUInteger)row];
+        [self askKey:old title:WQLocalizedNullable(@"Rename Key") done:^(NSString *key) {
+            if (self.doc.readOnly || self.doc.edit.saving) return;
+            if ([key isEqualToString:old]) return;
+            id v = self.container[old];
+            [self.container removeObjectForKey:old];
+            self.container[key] = v;
+            [self changed];
+        }];
+        completion(YES);
+    }];
+    return [UISwipeActionsConfiguration configurationWithActions:@[del, rename]];
+}
+
+- (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath
+{
+    return self.isArray && !self.doc.readOnly && !self.doc.edit.saving;
+}
+
+- (UITableViewCellEditingStyle)tableView:(UITableView *)tableView editingStyleForRowAtIndexPath:(NSIndexPath *)indexPath
+{
+    return UITableViewCellEditingStyleNone;
+}
+
+- (BOOL)tableView:(UITableView *)tableView shouldIndentWhileEditingRowAtIndexPath:(NSIndexPath *)indexPath
+{
+    return NO;
+}
+
+- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)from toIndexPath:(NSIndexPath *)to
+{
+    if (self.doc.readOnly || self.doc.edit.saving) return;
+    id v = self.container[(NSUInteger)from.row];
+    [self.container removeObjectAtIndex:(NSUInteger)from.row];
+    [self.container insertObject:v atIndex:(NSUInteger)to.row];
+    [self.doc.edit noteChange];
+    dispatch_async(dispatch_get_main_queue(), ^{ [self refresh]; });
+}
+
+@end

source/hook/src/WQPlistEditorSupport.h

@@ -0,0 +1,119 @@
+//
+//  WQPlistEditorSupport.h
+//  WQ Files
+//
+//  Portable limits shared by the property-list editor and its regression tests.
+//
+
+#import <Foundation/Foundation.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+enum {
+    WQPMaxDisplayedStringCharacters = 512,
+    WQPMaxStringInputCharacters = 64 * 1024,
+    WQPMaxDataBytes = 4 * 1024,
+    WQPMaxDataInputCharacters = 16 * 1024,
+    WQPMaxSerializedBytes = 64 * 1024 * 1024,
+};
+
+static inline BOOL WQPStringInputWithinLimit(NSString *text)
+{
+    return text.length <= WQPMaxStringInputCharacters;
+}
+
+static inline BOOL WQPDataInputWithinLimit(NSString *text)
+{
+    return text.length <= WQPMaxDataInputCharacters;
+}
+
+static inline BOOL WQPSerializedDataWithinLimit(NSData *data)
+{
+    return data.length <= WQPMaxSerializedBytes;
+}
+
+// CoreFoundation can write only XML and binary property lists. OpenStep and
+// unknown formats are readable but must be treated as read-only documents.
+static inline BOOL WQPlistFormatIsWritable(NSPropertyListFormat format)
+{
+    return format == NSPropertyListXMLFormat_v1_0 || format == NSPropertyListBinaryFormat_v1_0;
+}
+
+static inline NSString *WQPlistFormatName(NSPropertyListFormat format)
+{
+    switch (format) {
+        case NSPropertyListXMLFormat_v1_0: return @"XML";
+        case NSPropertyListBinaryFormat_v1_0: return @"Binary";
+        case NSPropertyListOpenStepFormat: return @"OpenStep";
+        default: return @"Unknown";
+    }
+}
+
+static inline NSString *WQPBoundedStringPreview(NSString *value)
+{
+    if (value.length == 0) return @"(empty)";
+    if (value.length <= WQPMaxDisplayedStringCharacters) return value;
+
+    NSString *suffix = [NSString stringWithFormat:@" … (%lu chars)", (unsigned long)value.length];
+    NSUInteger prefixLength = suffix.length < WQPMaxDisplayedStringCharacters
+        ? WQPMaxDisplayedStringCharacters - suffix.length : 0;
+    return [[value substringToIndex:prefixLength] stringByAppendingString:suffix];
+}
+
+// NSKeyedArchiver stores object references as CFKeyedArchiverUID values. They
+// are not NSNumber/NSString/NSData, and they do not implement -stringValue or
+// NSCopying. They are nevertheless valid property-list leaves and must be
+// preserved when the document is re-serialized.
+static inline BOOL WQPlistIsKeyedArchiveUID(id value)
+{
+    if (!value) return NO;
+    NSString *className = NSStringFromClass([value class]);
+    if (![className isEqualToString:@"__NSCFType"] && ![className containsString:@"KeyedArchiverUID"])
+        return NO;
+    NSString *description = [value description];
+    return [description hasPrefix:@"<CFKeyedArchiverUID "];
+}
+
+// Immutable, serializable copy of the editor's mutable document. Keyed-archive
+// UID leaves are immutable and are passed through unchanged; unsupported
+// objects fail the copy instead of reaching NSPropertyListSerialization.
+static inline id _Nullable WQPlistImmutableCopy(id value, NSString *_Nullable *_Nullable errorOut)
+{
+    if (!value) {
+        if (errorOut) *errorOut = @"The property list contains a nil value.";
+        return nil;
+    }
+    if (WQPlistIsKeyedArchiveUID(value)) return value;
+    if ([value isKindOfClass:NSDictionary.class]) {
+        NSDictionary *source = value;
+        NSMutableDictionary *copy = [NSMutableDictionary dictionaryWithCapacity:source.count];
+        for (id key in source) {
+            if (![key isKindOfClass:NSString.class]) {
+                if (errorOut) *errorOut = @"A dictionary key is not a string.";
+                return nil;
+            }
+            id child = WQPlistImmutableCopy(source[key], errorOut);
+            if (!child) return nil;
+            copy[key] = child;
+        }
+        return [copy copy];
+    }
+    if ([value isKindOfClass:NSArray.class]) {
+        NSArray *source = value;
+        NSMutableArray *copy = [NSMutableArray arrayWithCapacity:source.count];
+        for (id childValue in source) {
+            id child = WQPlistImmutableCopy(childValue, errorOut);
+            if (!child) return nil;
+            [copy addObject:child];
+        }
+        return [copy copy];
+    }
+    if ([value isKindOfClass:NSString.class] || [value isKindOfClass:NSNumber.class] ||
+        [value isKindOfClass:NSDate.class] || [value isKindOfClass:NSData.class]) {
+        return [value copy];
+    }
+    if (errorOut) *errorOut = @"The property list contains an unsupported value.";
+    return nil;
+}
+
+NS_ASSUME_NONNULL_END

source/hook/src/WQSQLiteViewer.h

@@ -0,0 +1,23 @@
+//
+//  WQSQLiteViewer.h
+//  WQ Files
+//
+//  Read-only SQLite viewer: tables and views, rows, single-row details,
+//  read-only SQL queries and CSV export. Works on a private copy of the
+//  database (and its -wal file) in WQ Files' temporary folder, so the app's
+//  own files are never opened for writing and no journal files appear in its
+//  container.
+//
+
+#import <UIKit/UIKit.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface WQSQLiteViewController : UITableViewController
+- (instancetype)initWithPath:(NSString *)path;
+@end
+
+// Whether the first bytes of a file are an SQLite 3 header.
+BOOL wq_is_sqlite_header(NSData *head);
+
+NS_ASSUME_NONNULL_END

source/hook/src/WQSQLiteViewer.m

@@ -0,0 +1,636 @@
+//
+//  WQSQLiteViewer.m
+//  WQ Files
+//
+//  Read-only SQLite viewer. The database and its -wal file are copied into a
+//  private temporary folder first (a -shm file is rebuilt by SQLite there),
+//  then opened with PRAGMA query_only. Every statement is checked with
+//  sqlite3_stmt_readonly before it runs.
+//
+
+#import "WQSQLiteViewer.h"
+#import "WQAccess.h"
+#import "WQSharing.h"
+#import "WQUI.h"
+#import <sqlite3.h>
+
+BOOL wq_is_sqlite_header(NSData *head)
+{
+    return head.length >= 16 && memcmp(head.bytes, "SQLite format 3\0", 16) == 0;
+}
+
+static const NSUInteger kWQSQLitePage = 100;
+static const NSUInteger kWQSQLiteQueryLimit = 1000;
+
+#pragma mark - Snapshot
+
+// A private copy of the database. All SQLite calls run on its serial queue.
+@interface WQSQLiteSnapshot : NSObject
+@property (nonatomic, readonly) dispatch_queue_t queue;
+@property (nonatomic, readonly, nullable) sqlite3 *db;
+@property (nonatomic, copy, readonly) NSString *sourcePath;
+@property (nonatomic, readonly) BOOL copiedWAL;
+@end
+
+@implementation WQSQLiteSnapshot {
+    NSString *_dir;
+}
+
+// Streams `src` into `dst` through wq_read_range (which asks for access when
+// needed). Returns NO with an error text on failure.
+static BOOL wq_sqlite_copy(NSString *src, NSString *dst, NSString **error)
+{
+    if (![NSFileManager.defaultManager createFileAtPath:dst contents:nil attributes:nil]) {
+        *error = WQLocalized(@"cannot create the temporary copy");
+        return NO;
+    }
+    NSFileHandle *out = [NSFileHandle fileHandleForWritingAtPath:dst];
+    if (!out) { *error = WQLocalized(@"cannot write the temporary copy"); return NO; }
+    const NSUInteger chunk = 1024 * 1024;
+    unsigned long long offset = 0;
+    BOOL ok = YES;
+    @try {
+        for (;;) {
+            NSString *readError = nil;
+            NSData *data = wq_read_range(src, offset, chunk, &readError);
+            if (!data) { *error = readError ?: WQLocalized(@"read failed"); ok = NO; break; }
+            if (data.length) [out writeData:data];
+            offset += data.length;
+            if (data.length < chunk) break;
+        }
+    } @catch (NSException *exception) {
+        *error = exception.reason ?: WQLocalized(@"write failed");
+        ok = NO;
+    }
+    [out closeFile];
+    return ok;
+}
+
+- (nullable instancetype)initWithPath:(NSString *)path error:(NSString **)error
+{
+    if (!(self = [super init])) return nil;
+    _sourcePath = [path copy];
+    _queue = dispatch_queue_create("wqfiles.sqlite", DISPATCH_QUEUE_SERIAL);
+    _dir = [NSTemporaryDirectory() stringByAppendingPathComponent:
+            [@"wq-sqlite-" stringByAppendingString:NSUUID.UUID.UUIDString]];
+    if (![NSFileManager.defaultManager createDirectoryAtPath:_dir withIntermediateDirectories:YES attributes:nil error:nil]) {
+        *error = WQLocalized(@"cannot create a temporary folder");
+        return nil;
+    }
+    NSString *copy = [_dir stringByAppendingPathComponent:@"db.sqlite"];
+    if (!wq_sqlite_copy(path, copy, error)) return nil;
+    // Recent changes of WAL databases are still in the -wal file. The -shm
+    // index is not copied: SQLite rebuilds it next to the copy.
+    NSString *wal = [path stringByAppendingString:@"-wal"];
+    struct stat st;
+    if (wq_stat(wal, &st) && S_ISREG(st.st_mode) && st.st_size > 0) {
+        NSString *walError = nil;
+        _copiedWAL = wq_sqlite_copy(wal, [copy stringByAppendingString:@"-wal"], &walError);
+        if (!_copiedWAL) wq_log(@"sqlite: -wal of %@ not copied (%@); recent changes may be missing", path, walError);
+    }
+    // Read-write on the private copy so SQLite can apply the WAL there;
+    // query_only and the per-statement check keep it read-only in practice.
+    sqlite3 *db = NULL;
+    int rc = sqlite3_open_v2(copy.fileSystemRepresentation, &db, SQLITE_OPEN_READWRITE | SQLITE_OPEN_NOMUTEX, NULL);
+    if (rc != SQLITE_OK) {
+        *error = db ? @(sqlite3_errmsg(db)) : WQLocalized(@"cannot open the database");
+        if (db) sqlite3_close(db);
+        return nil;
+    }
+    sqlite3_exec(db, "PRAGMA query_only = ON", NULL, NULL, NULL);
+    // Fail early on files that only look like databases.
+    sqlite3_stmt *probe = NULL;
+    rc = sqlite3_prepare_v2(db, "SELECT count(*) FROM sqlite_master", -1, &probe, NULL);
+    if (rc == SQLITE_OK) rc = sqlite3_step(probe);
+    sqlite3_finalize(probe);
+    if (rc != SQLITE_ROW) {
+        *error = @(sqlite3_errmsg(db));
+        sqlite3_close(db);
+        return nil;
+    }
+    _db = db;
+    return self;
+}
+
+- (void)dealloc
+{
+    if (_db) sqlite3_close(_db);
+    if (_dir) [NSFileManager.defaultManager removeItemAtPath:_dir error:nil];
+}
+
+@end
+
+#pragma mark - Values
+
+static NSString *wq_sqlite_quote_identifier(NSString *name)
+{
+    return [NSString stringWithFormat:@"\"%@\"", [name stringByReplacingOccurrencesOfString:@"\"" withString:@"\"\""]];
+}
+
+static NSString *wq_sqlite_hex(const uint8_t *bytes, int length, int limit)
+{
+    NSMutableString *hex = [NSMutableString new];
+    for (int i = 0; i < length && i < limit; i++) [hex appendFormat:@"%02x%s", bytes[i], (i % 4 == 3) ? " " : ""];
+    if (length > limit) [hex appendString:@"…"];
+    return hex;
+}
+
+// A column value as display text; `full` shows long text and blobs in more detail.
+static NSString *wq_sqlite_value(sqlite3_stmt *stmt, int column, BOOL full)
+{
+    switch (sqlite3_column_type(stmt, column)) {
+        case SQLITE_NULL: return WQLocalized(@"NULL");
+        case SQLITE_INTEGER: return [NSString stringWithFormat:@"%lld", sqlite3_column_int64(stmt, column)];
+        case SQLITE_FLOAT: return [NSString stringWithFormat:@"%.15g", sqlite3_column_double(stmt, column)];
+        case SQLITE_BLOB: {
+            const uint8_t *bytes = sqlite3_column_blob(stmt, column);
+            int length = sqlite3_column_bytes(stmt, column);
+            if (length >= 8 && bytes && memcmp(bytes, "bplist0", 7) == 0)
+                return WQLocalizedFormat(@"<binary plist, %d bytes>", length);
+            NSString *hex = bytes ? wq_sqlite_hex(bytes, length, full ? 512 : 16) : @"";
+            return WQLocalizedFormat(@"<%d bytes> %@", length, hex);
+        }
+        default: {
+            const unsigned char *text = sqlite3_column_text(stmt, column);
+            NSString *s = text ? [NSString stringWithUTF8String:(const char *)text] : nil;
+            if (!s) return WQLocalized(@"<text not UTF-8>");
+            if (!full && s.length > 200) s = [[s substringToIndex:200] stringByAppendingString:@"…"];
+            return s;
+        }
+    }
+}
+
+static NSString *wq_sqlite_csv_field(sqlite3_stmt *stmt, int column)
+{
+    if (sqlite3_column_type(stmt, column) == SQLITE_NULL) return @"";
+    if (sqlite3_column_type(stmt, column) == SQLITE_BLOB) {
+        const uint8_t *bytes = sqlite3_column_blob(stmt, column);
+        int length = sqlite3_column_bytes(stmt, column);
+        NSData *data = bytes ? [NSData dataWithBytes:bytes length:(NSUInteger)length] : [NSData data];
+        return [@"base64:" stringByAppendingString:[data base64EncodedStringWithOptions:0]];
+    }
+    NSString *value = wq_sqlite_value(stmt, column, YES);
+    if ([value rangeOfCharacterFromSet:[NSCharacterSet characterSetWithCharactersInString:@",\"\n\r"]].location == NSNotFound)
+        return value;
+    return [NSString stringWithFormat:@"\"%@\"", [value stringByReplacingOccurrencesOfString:@"\"" withString:@"\"\""]];
+}
+
+#pragma mark - Row detail
+
+@interface WQSQLiteRowViewController : UITableViewController
+- (instancetype)initWithColumns:(NSArray<NSString *> *)columns values:(NSArray<NSString *> *)values title:(NSString *)title;
+@end
+
+@implementation WQSQLiteRowViewController {
+    NSArray<NSString *> *_columns;
+    NSArray<NSString *> *_values;
+}
+
+- (instancetype)initWithColumns:(NSArray<NSString *> *)columns values:(NSArray<NSString *> *)values title:(NSString *)title
+{
+    if ((self = [super initWithStyle:UITableViewStyleInsetGrouped])) {
+        _columns = [columns copy];
+        _values = [values copy];
+        self.title = title;
+    }
+    return self;
+}
+
+- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { return (NSInteger)_columns.count; }
+- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { return 1; }
+- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section { return _columns[(NSUInteger)section]; }
+
+- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
+{
+    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"v"]
+        ?: [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"v"];
+    UIListContentConfiguration *c = cell.defaultContentConfiguration;
+    c.text = _values[(NSUInteger)indexPath.section];
+    c.textProperties.font = [UIFont monospacedSystemFontOfSize:14 weight:UIFontWeightRegular];
+    c.textProperties.numberOfLines = 0;
+    cell.contentConfiguration = c;
+    cell.selectionStyle = UITableViewCellSelectionStyleNone;
+    return cell;
+}
+
+- (UIContextMenuConfiguration *)tableView:(UITableView *)tableView
+    contextMenuConfigurationForRowAtIndexPath:(NSIndexPath *)indexPath point:(CGPoint)point
+{
+    NSString *value = _values[(NSUInteger)indexPath.section];
+    return [UIContextMenuConfiguration configurationWithIdentifier:nil previewProvider:nil
+        actionProvider:^UIMenu *(NSArray<UIMenuElement *> *__unused suggested) {
+        return [UIMenu menuWithChildren:@[[UIAction actionWithTitle:WQLocalizedNullable(@"Copy") image:[UIImage systemImageNamed:@"doc.on.doc"]
+                                                          identifier:nil handler:^(UIAction *__unused a) {
+            UIPasteboard.generalPasteboard.string = value;
+        }]]];
+    }];
+}
+
+@end
+
+#pragma mark - Rows (a table, a view or a query)
+
+@interface WQSQLiteRowsViewController : UITableViewController
+- (instancetype)initWithSnapshot:(WQSQLiteSnapshot *)snapshot sql:(NSString *)sql title:(NSString *)title
+                     exportName:(nullable NSString *)exportName limit:(NSUInteger)limit;
+@end
+
+@implementation WQSQLiteRowsViewController {
+    WQSQLiteSnapshot *_snapshot;
+    NSString *_sql;
+    NSString *_exportName;
+    NSUInteger _limit;            // 0 = page through everything
+    NSArray<NSString *> *_columns;
+    NSMutableArray<NSArray<NSString *> *> *_rows;
+    BOOL _loading, _done;
+    NSString *_error;
+}
+
+- (instancetype)initWithSnapshot:(WQSQLiteSnapshot *)snapshot sql:(NSString *)sql title:(NSString *)title
+                     exportName:(NSString *)exportName limit:(NSUInteger)limit
+{
+    if ((self = [super initWithStyle:UITableViewStylePlain])) {
+        _snapshot = snapshot;
+        _sql = [sql copy];
+        _exportName = [exportName copy];
+        _limit = limit;
+        _rows = [NSMutableArray new];
+        self.title = title;
+    }
+    return self;
+}
+
+- (void)viewDidLoad
+{
+    [super viewDidLoad];
+    if (_exportName) {
+        self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:WQLocalizedNullable(@"CSV") style:UIBarButtonItemStylePlain
+                                                                                 target:self action:@selector(exportCSV:)];
+    }
+    [self loadMore];
+}
+
+- (void)loadMore
+{
+    if (_loading || _done) return;
+    _loading = YES;
+    NSUInteger offset = _rows.count;
+    NSUInteger page = _limit ? _limit : kWQSQLitePage;
+    WQSQLiteSnapshot *snapshot = _snapshot;
+    // Tables page with LIMIT/OFFSET; a query (which may be a PRAGMA or EXPLAIN,
+    // and can't be wrapped) runs as typed and stops after `_limit` rows.
+    NSString *sql = _limit ? _sql : [NSString stringWithFormat:@"SELECT * FROM (%@) LIMIT %lu OFFSET %lu",
+                                     _sql, (unsigned long)page, (unsigned long)offset];
+    dispatch_async(snapshot.queue, ^{
+        NSMutableArray *columns = [NSMutableArray new];
+        NSMutableArray *rows = [NSMutableArray new];
+        NSString *error = nil;
+        sqlite3_stmt *stmt = NULL;
+        if (sqlite3_prepare_v2(snapshot.db, sql.UTF8String, -1, &stmt, NULL) != SQLITE_OK) {
+            error = @(sqlite3_errmsg(snapshot.db));
+        } else if (!sqlite3_stmt_readonly(stmt)) {
+            error = WQLocalized(@"Only read-only statements can run here.");
+        } else {
+            int count = sqlite3_column_count(stmt);
+            for (int i = 0; i < count; i++) [columns addObject:@(sqlite3_column_name(stmt, i) ?: "?")];
+            int rc = SQLITE_DONE;
+            while (rows.count < page && (rc = sqlite3_step(stmt)) == SQLITE_ROW) {
+                NSMutableArray *values = [NSMutableArray arrayWithCapacity:(NSUInteger)count];
+                for (int i = 0; i < count; i++) [values addObject:wq_sqlite_value(stmt, i, YES)];
+                [rows addObject:values];
+            }
+            if (rows.count < page && rc != SQLITE_DONE) error = @(sqlite3_errmsg(snapshot.db));
+        }
+        sqlite3_finalize(stmt);
+        dispatch_async(dispatch_get_main_queue(), ^{
+            self->_loading = NO;
+            if (error) { self->_error = error; self->_done = YES; [self.tableView reloadData]; return; }
+            if (!self->_columns) self->_columns = columns;
+            [self->_rows addObjectsFromArray:rows];
+            if (rows.count < page || self->_limit) self->_done = YES;
+            [self.tableView reloadData];
+        });
+    });
+}
+
+- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
+{
+    return (_error || (!_rows.count && _done)) ? 1 : (NSInteger)_rows.count;
+}
+
+- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
+{
+    if (_error || !_columns) return nil;
+    NSString *more = _done ? @"" : @"+";
+    if (_limit && _rows.count >= _limit) more = WQLocalizedFormat(@" (first %lu)", (unsigned long)_limit);
+    return WQLocalizedFormat(@"%lu%@ rows · %lu columns", (unsigned long)_rows.count, more, (unsigned long)_columns.count);
+}
+
+- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
+{
+    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"row"]
+        ?: [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:@"row"];
+    UIListContentConfiguration *c = cell.defaultContentConfiguration;
+    if (_error || !_rows.count) {
+        c.text = _error ?: WQLocalized(@"No rows");
+        c.textProperties.color = _error ? UIColor.systemRedColor : UIColor.secondaryLabelColor;
+        c.textProperties.numberOfLines = 0;
+        cell.contentConfiguration = c;
+        cell.accessoryType = UITableViewCellAccessoryNone;
+        return cell;
+    }
+    NSArray<NSString *> *values = _rows[(NSUInteger)indexPath.row];
+    NSMutableArray *parts = [NSMutableArray new];
+    for (NSUInteger i = 0; i < values.count && i < _columns.count; i++) {
+        NSString *v = values[i];
+        if (v.length > 80) v = [[v substringToIndex:80] stringByAppendingString:@"…"];
+        [parts addObject:[NSString stringWithFormat:@"%@: %@", _columns[i], v]];
+    }
+    c.text = parts.firstObject;
+    c.secondaryText = parts.count > 1 ? [[parts subarrayWithRange:NSMakeRange(1, parts.count - 1)] componentsJoinedByString:@" · "] : nil;
+    c.textProperties.font = [UIFont monospacedSystemFontOfSize:14 weight:UIFontWeightRegular];
+    c.secondaryTextProperties.numberOfLines = 2;
+    c.secondaryTextProperties.color = UIColor.secondaryLabelColor;
+    cell.contentConfiguration = c;
+    cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
+    if ((NSUInteger)indexPath.row + 20 >= _rows.count) [self loadMore];
+    return cell;
+}
+
+- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
+{
+    [tableView deselectRowAtIndexPath:indexPath animated:YES];
+    if (_error || (NSUInteger)indexPath.row >= _rows.count) return;
+    WQSQLiteRowViewController *detail = [[WQSQLiteRowViewController alloc]
+        initWithColumns:_columns values:_rows[(NSUInteger)indexPath.row]
+                  title:WQLocalizedFormat(@"Row %ld", (long)indexPath.row + 1)];
+    [self.navigationController pushViewController:detail animated:YES];
+}
+
+- (void)exportCSV:(UIBarButtonItem *)sender
+{
+    WQSQLiteSnapshot *snapshot = _snapshot;
+    NSString *sql = _sql;
+    NSString *name = [[_exportName stringByReplacingOccurrencesOfString:@"/" withString:@"_"] stringByAppendingPathExtension:@"csv"];
+    NSString *dir = [NSTemporaryDirectory() stringByAppendingPathComponent:@"wq-sqlite-export"];
+    [NSFileManager.defaultManager createDirectoryAtPath:dir withIntermediateDirectories:YES attributes:nil error:nil];
+    NSString *out = [dir stringByAppendingPathComponent:name];
+    sender.enabled = NO;
+    dispatch_async(snapshot.queue, ^{
+        NSString *error = nil;
+        [NSFileManager.defaultManager createFileAtPath:out contents:nil attributes:nil];
+        NSFileHandle *file = [NSFileHandle fileHandleForWritingAtPath:out];
+        sqlite3_stmt *stmt = NULL;
+        if (!file) error = WQLocalized(@"cannot create the CSV file");
+        else if (sqlite3_prepare_v2(snapshot.db, sql.UTF8String, -1, &stmt, NULL) != SQLITE_OK) error = @(sqlite3_errmsg(snapshot.db));
+        else if (!sqlite3_stmt_readonly(stmt)) error = WQLocalized(@"Only read-only statements can run here.");
+        else {
+            int count = sqlite3_column_count(stmt);
+            NSMutableArray *header = [NSMutableArray new];
+            for (int i = 0; i < count; i++) [header addObject:@(sqlite3_column_name(stmt, i) ?: "?")];
+            [file writeData:[[[header componentsJoinedByString:@","] stringByAppendingString:@"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
+            while (sqlite3_step(stmt) == SQLITE_ROW) {
+                @autoreleasepool {
+                    NSMutableArray *fields = [NSMutableArray arrayWithCapacity:(NSUInteger)count];
+                    for (int i = 0; i < count; i++) [fields addObject:wq_sqlite_csv_field(stmt, i)];
+                    [file writeData:[[[fields componentsJoinedByString:@","] stringByAppendingString:@"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
+                }
+            }
+        }
+        sqlite3_finalize(stmt);
+        [file closeFile];
+        dispatch_async(dispatch_get_main_queue(), ^{
+            sender.enabled = YES;
+            if (error) { wq_alert(self, @"Cannot export", error); return; }
+            wq_share(self, out, nil);
+        });
+    });
+}
+
+@end
+
+#pragma mark - Query
+
+@interface WQSQLiteQueryViewController : UIViewController
+- (instancetype)initWithSnapshot:(WQSQLiteSnapshot *)snapshot;
+@end
+
+@implementation WQSQLiteQueryViewController {
+    WQSQLiteSnapshot *_snapshot;
+    UITextView *_textView;
+}
+
+- (instancetype)initWithSnapshot:(WQSQLiteSnapshot *)snapshot
+{
+    if ((self = [super initWithNibName:nil bundle:nil])) {
+        _snapshot = snapshot;
+        self.title = WQLocalizedNullable(@"SQL");
+    }
+    return self;
+}
+
+- (void)viewDidLoad
+{
+    [super viewDidLoad];
+    self.view.backgroundColor = UIColor.systemBackgroundColor;
+    _textView = [UITextView new];
+    _textView.translatesAutoresizingMaskIntoConstraints = NO;
+    _textView.font = [UIFont monospacedSystemFontOfSize:15 weight:UIFontWeightRegular];
+    _textView.semanticContentAttribute = UISemanticContentAttributeForceLeftToRight;   // SQL stays left to right
+    _textView.textAlignment = NSTextAlignmentLeft;
+    _textView.autocapitalizationType = UITextAutocapitalizationTypeNone;
+    _textView.autocorrectionType = UITextAutocorrectionTypeNo;
+    _textView.smartQuotesType = UITextSmartQuotesTypeNo;
+    _textView.smartDashesType = UITextSmartDashesTypeNo;
+    _textView.text = @"SELECT name, type FROM sqlite_master";
+    [self.view addSubview:_textView];
+    UILayoutGuide *g = self.view.safeAreaLayoutGuide;
+    [NSLayoutConstraint activateConstraints:@[
+        [_textView.topAnchor constraintEqualToAnchor:g.topAnchor],
+        [_textView.bottomAnchor constraintEqualToAnchor:self.view.keyboardLayoutGuide.topAnchor],
+        [_textView.leadingAnchor constraintEqualToAnchor:g.leadingAnchor constant:8],
+        [_textView.trailingAnchor constraintEqualToAnchor:g.trailingAnchor constant:-8],
+    ]];
+    self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:WQLocalizedNullable(@"Run") style:UIBarButtonItemStyleProminent
+                                                                             target:self action:@selector(run)];
+    [_textView becomeFirstResponder];
+}
+
+- (void)run
+{
+    NSString *sql = [_textView.text stringByTrimmingCharactersInSet:NSCharacterSet.whitespaceAndNewlineCharacterSet];
+    while ([sql hasSuffix:@";"]) sql = [[sql substringToIndex:sql.length - 1] stringByTrimmingCharactersInSet:NSCharacterSet.whitespaceAndNewlineCharacterSet];
+    if (!sql.length) return;
+    // Only a single read-only statement: checked before anything runs.
+    WQSQLiteSnapshot *snapshot = _snapshot;
+    __block NSString *error = nil;
+    dispatch_sync(snapshot.queue, ^{
+        sqlite3_stmt *stmt = NULL;
+        const char *tail = NULL;
+        if (sqlite3_prepare_v2(snapshot.db, sql.UTF8String, -1, &stmt, &tail) != SQLITE_OK) error = @(sqlite3_errmsg(snapshot.db));
+        else if (!stmt) error = WQLocalized(@"Nothing to run.");
+        else if (!sqlite3_stmt_readonly(stmt)) error = WQLocalized(@"Only read-only statements (SELECT, read-only PRAGMA, EXPLAIN) can run here.");
+        else if (tail && *tail) {
+            NSString *rest = [@(tail) stringByTrimmingCharactersInSet:NSCharacterSet.whitespaceAndNewlineCharacterSet];
+            if (rest.length) error = WQLocalized(@"Run one statement at a time.");
+        }
+        else if (sqlite3_column_count(stmt) == 0) error = WQLocalized(@"This statement returns no rows.");
+        sqlite3_finalize(stmt);
+    });
+    if (error) { wq_alert(self, @"Cannot run", error); return; }
+    WQSQLiteRowsViewController *rows = [[WQSQLiteRowsViewController alloc] initWithSnapshot:snapshot sql:sql title:WQLocalizedNullable(@"Result")
+                                                                                 exportName:@"query" limit:kWQSQLiteQueryLimit];
+    [self.navigationController pushViewController:rows animated:YES];
+}
+
+@end
+
+#pragma mark - Tables
+
+@implementation WQSQLiteViewController {
+    NSString *_path;
+    WQSQLiteSnapshot *_snapshot;
+    NSArray<NSDictionary *> *_tables;   // name, type, rows (NSNumber, filled in later)
+    NSMutableDictionary<NSString *, NSNumber *> *_counts;
+    NSString *_error;
+    BOOL _loading;
+}
+
+- (instancetype)initWithPath:(NSString *)path
+{
+    if ((self = [super initWithStyle:UITableViewStyleInsetGrouped])) {
+        _path = [path copy];
+        _counts = [NSMutableDictionary new];
+        _loading = YES;
+        self.title = path.lastPathComponent;
+    }
+    return self;
+}
+
+- (void)viewDidLoad
+{
+    [super viewDidLoad];
+    self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:WQLocalizedNullable(@"SQL") style:UIBarButtonItemStylePlain
+                                                                             target:self action:@selector(openQuery)];
+    self.navigationItem.rightBarButtonItem.enabled = NO;
+    NSString *path = _path;
+    dispatch_async(dispatch_get_global_queue(QOS_CLASS_USER_INITIATED, 0), ^{
+        NSString *error = nil;
+        WQSQLiteSnapshot *snapshot = [[WQSQLiteSnapshot alloc] initWithPath:path error:&error];
+        NSMutableArray *tables = [NSMutableArray new];
+        if (snapshot) {
+            dispatch_sync(snapshot.queue, ^{
+                sqlite3_stmt *stmt = NULL;
+                if (sqlite3_prepare_v2(snapshot.db, "SELECT name, type FROM sqlite_master WHERE type IN ('table','view') ORDER BY type, name",
+                                       -1, &stmt, NULL) == SQLITE_OK) {
+                    while (sqlite3_step(stmt) == SQLITE_ROW) {
+                        const unsigned char *name = sqlite3_column_text(stmt, 0), *type = sqlite3_column_text(stmt, 1);
+                        if (name && type) [tables addObject:@{ @"name": @((const char *)name), @"type": @((const char *)type) }];
+                    }
+                }
+                sqlite3_finalize(stmt);
+            });
+        }
+        if (!snapshot) wq_log(@"sqlite: cannot open %@ (%@)", path, error);
+        dispatch_async(dispatch_get_main_queue(), ^{
+            self->_loading = NO;
+            self->_snapshot = snapshot;
+            self->_tables = tables;
+            self->_error = snapshot ? nil : error;
+            self.navigationItem.rightBarButtonItem.enabled = snapshot != nil;
+            [self.tableView reloadData];
+            if (snapshot) [self countRows];
+        });
+    });
+}
+
+// Row counts for tables, one at a time in the background (big tables take a while).
+- (void)countRows
+{
+    WQSQLiteSnapshot *snapshot = _snapshot;
+    NSArray *tables = _tables;
+    __weak typeof(self) weakSelf = self;
+    dispatch_async(snapshot.queue, ^{
+        for (NSDictionary *table in tables) {
+            if (!weakSelf) return;
+            if (![table[@"type"] isEqualToString:@"table"]) continue;
+            NSString *sql = [@"SELECT count(*) FROM " stringByAppendingString:wq_sqlite_quote_identifier(table[@"name"])];
+            sqlite3_stmt *stmt = NULL;
+            long long count = -1;
+            if (sqlite3_prepare_v2(snapshot.db, sql.UTF8String, -1, &stmt, NULL) == SQLITE_OK && sqlite3_step(stmt) == SQLITE_ROW)
+                count = sqlite3_column_int64(stmt, 0);
+            sqlite3_finalize(stmt);
+            NSString *name = table[@"name"];
+            dispatch_async(dispatch_get_main_queue(), ^{
+                WQSQLiteViewController *strongSelf = weakSelf;
+                if (!strongSelf || count < 0) return;
+                strongSelf->_counts[name] = @(count);
+                [strongSelf.tableView reloadData];
+            });
+        }
+    });
+}
+
+- (void)openQuery
+{
+    if (!_snapshot) return;
+    [self.navigationController pushViewController:[[WQSQLiteQueryViewController alloc] initWithSnapshot:_snapshot] animated:YES];
+}
+
+- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
+{
+    return (_loading || _error || !_tables.count) ? 1 : (NSInteger)_tables.count;
+}
+
+- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
+{
+    return _tables.count ? WQLocalized(@"Tables and views") : nil;
+}
+
+- (NSString *)tableView:(UITableView *)tableView titleForFooterInSection:(NSInteger)section
+{
+    if (!_snapshot) return nil;
+    NSString *wal = _snapshot.copiedWAL ? WQLocalized(@" and its -wal file") : @"";
+    return WQLocalizedFormat(@"Read-only. This is a copy of the database%@ made when it was opened; the app's own file is not changed. Close the app first for an up-to-date copy.", wal);
+}
+
+- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
+{
+    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"t"]
+        ?: [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:@"t"];
+    UIListContentConfiguration *c = [UIListContentConfiguration valueCellConfiguration];
+    cell.accessoryType = UITableViewCellAccessoryNone;
+    if (_loading) {
+        c.text = WQLocalizedNullable(@"Copying and opening…");
+    } else if (_error) {
+        c.text = [WQLocalized(@"Cannot open this database: ") stringByAppendingString:_error];
+        c.textProperties.color = UIColor.systemRedColor;
+        c.textProperties.numberOfLines = 0;
+    } else if (!_tables.count) {
+        c.text = WQLocalizedNullable(@"No tables");
+        c.textProperties.color = UIColor.secondaryLabelColor;
+    } else {
+        NSDictionary *table = _tables[(NSUInteger)indexPath.row];
+        BOOL view = [table[@"type"] isEqualToString:@"view"];
+        c.text = table[@"name"];
+        c.image = [UIImage systemImageNamed:view ? @"eye" : @"tablecells"];
+        NSNumber *count = _counts[table[@"name"]];
+        c.secondaryText = view ? WQLocalized(@"view") : (count ? WQLocalizedFormat(@"%@ rows", count) : @"…");
+        cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
+    }
+    cell.contentConfiguration = c;
+    return cell;
+}
+
+- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
+{
+    [tableView deselectRowAtIndexPath:indexPath animated:YES];
+    if (!_snapshot || (NSUInteger)indexPath.row >= _tables.count) return;
+    NSString *name = _tables[(NSUInteger)indexPath.row][@"name"];
+    NSString *sql = [@"SELECT * FROM " stringByAppendingString:wq_sqlite_quote_identifier(name)];
+    WQSQLiteRowsViewController *rows = [[WQSQLiteRowsViewController alloc] initWithSnapshot:_snapshot sql:sql title:name
+                                                                                 exportName:name limit:0];
+    [self.navigationController pushViewController:rows animated:YES];
+}
+
+@end

source/hook/src/WQSharing.h

@@ -0,0 +1,14 @@
+//
+//  WQSharing.h
+//  WQ Files temporary exports and share sheets
+//
+
+#import <UIKit/UIKit.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+void wq_share(UIViewController *host, NSString *path, UIView *_Nullable source);
+void wq_share_folder(UIViewController *host, NSString *dir, NSString *_Nullable zipName, UIView *_Nullable source);
+void wq_share_cancel(UIViewController *host);
+
+NS_ASSUME_NONNULL_END

source/hook/src/WQSharing.m

@@ -0,0 +1,239 @@
+//
+//  WQSharing.m
+//  WQ Files temporary exports and share sheets
+//  GPL-3.0-or-later.
+//
+
+#import "WQSharing.h"
+#import "WQUI.h"
+#import "WQAccess.h"
+#import <objc/runtime.h>
+#import <sys/stat.h>
+
+@interface WQSharePreparation : NSObject
+@property (nonatomic, weak) UIViewController *host;
+@property (nonatomic, weak) UIAlertController *hud;
+@property (nonatomic, copy) NSString *exportDir;
+@property (atomic, getter=isCancelled) BOOL cancelled;
+@end
+
+@implementation WQSharePreparation
+@end
+
+static char kWQSharePreparationKey;
+static char kWQShareInFlightKey;
+
+static NSString *wq_unique_export_directory(void)
+{
+    NSString *dir = [NSTemporaryDirectory() stringByAppendingPathComponent:
+                     [@"WQShare-" stringByAppendingString:NSUUID.UUID.UUIDString]];
+    NSError *error = nil;
+    return [NSFileManager.defaultManager createDirectoryAtPath:dir withIntermediateDirectories:YES
+                                                   attributes:nil error:&error] ? dir : nil;
+}
+
+static void wq_remove_export(NSString *exportDir)
+{
+    if (exportDir.length) [NSFileManager.defaultManager removeItemAtPath:exportDir error:nil];
+}
+
+static BOOL wq_share_host_is_active(UIViewController *host)
+{
+    if (!host || !host.isViewLoaded || !host.view.window) return NO;
+    UIWindowScene *scene = host.view.window.windowScene;
+    if (scene && scene.activationState != UISceneActivationStateForegroundActive) return NO;
+    UINavigationController *nav = host.navigationController;
+    if (nav && nav.topViewController != host) return NO;
+    if (host.presentedViewController && !host.presentedViewController.isBeingDismissed) return NO;
+    return YES;
+}
+
+static BOOL wq_shareable_regular_file(NSString *path)
+{
+    if (!path.length) return NO;
+    struct stat st;
+    // Do not follow a final symlink: wq_copy_to_local uses O_NOFOLLOW too.
+    if (lstat(path.fileSystemRepresentation, &st) == 0) return S_ISREG(st.st_mode);
+    if (wq_grant(path) && lstat(path.fileSystemRepresentation, &st) == 0) return S_ISREG(st.st_mode);
+    return NO;
+}
+
+static void wq_clear_preparation(UIViewController *host, WQSharePreparation *preparation)
+{
+    if (!host) return;
+    if (objc_getAssociatedObject(host, &kWQSharePreparationKey) == preparation) {
+        objc_setAssociatedObject(host, &kWQSharePreparationKey, nil, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
+    }
+}
+
+static BOOL wq_share_in_flight(UIViewController *host)
+{
+    return host && (objc_getAssociatedObject(host, &kWQSharePreparationKey) ||
+                    objc_getAssociatedObject(host, &kWQShareInFlightKey));
+}
+
+static void wq_clear_in_flight(UIViewController *host)
+{
+    if (!host) return;
+    objc_setAssociatedObject(host, &kWQShareInFlightKey, nil, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
+}
+
+static BOOL wq_present_share(UIViewController *host, NSString *file, NSString *exportDir, UIView *source)
+{
+    if (!wq_share_host_is_active(host)) {
+        wq_remove_export(exportDir);
+        return NO;
+    }
+    UIActivityViewController *share = [[UIActivityViewController alloc]
+        initWithActivityItems:@[[NSURL fileURLWithPath:file]] applicationActivities:nil];
+    UIView *anchor = source.window ? source : host.view;
+    share.popoverPresentationController.sourceView = anchor;
+    share.popoverPresentationController.sourceRect = anchor.bounds;
+    share.completionWithItemsHandler = ^(UIActivityType __unused activityType, BOOL __unused completed,
+                                         NSArray *__unused returnedItems, NSError *__unused activityError) {
+        wq_remove_export(exportDir);
+    };
+    [host presentViewController:share animated:YES completion:^{
+        // A presentation rejected after the visibility check must not strand the export.
+        if (!share.presentingViewController) wq_remove_export(exportDir);
+    }];
+    return YES;
+}
+
+// Cancel folder preparation when its browser is popped or otherwise abandoned.
+// The export is removed by the worker's completion, after any in-progress copy has stopped.
+void wq_share_cancel(UIViewController *host)
+{
+    if (!host) return;
+    wq_clear_in_flight(host);
+    WQSharePreparation *preparation = objc_getAssociatedObject(host, &kWQSharePreparationKey);
+    preparation.cancelled = YES;
+    if (host) objc_setAssociatedObject(host, &kWQSharePreparationKey, nil, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
+    UIAlertController *hud = preparation.hud;
+    if (hud && host.presentedViewController == hud) {
+        [host dismissViewControllerAnimated:NO completion:nil];
+    }
+}
+
+// Copies a file into a unique temporary directory so concurrent shares cannot
+// overwrite one another. The export is removed when the share sheet finishes.
+void wq_share(UIViewController *host, NSString *path, UIView *source)
+{
+    if (!host) return;
+    if (wq_share_in_flight(host)) {
+        wq_alert(host, @"Share in progress", @"Wait for the current share to finish before starting another.");
+        return;
+    }
+    objc_setAssociatedObject(host, &kWQShareInFlightKey, @YES, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
+    __weak UIViewController *weakHost = host;
+    dispatch_async(dispatch_get_global_queue(QOS_CLASS_USER_INITIATED, 0), ^{
+        NSString *error = nil;
+        NSString *outDir = nil;
+        NSString *tmp = nil;
+        BOOL ok = NO;
+        if (!wq_shareable_regular_file(path)) {
+            error = @"Only regular files can be shared.";
+        } else {
+            outDir = wq_unique_export_directory();
+            tmp = outDir ? [outDir stringByAppendingPathComponent:path.lastPathComponent] : nil;
+            ok = tmp && wq_copy_to_local(path, tmp, &error);
+        }
+        dispatch_async(dispatch_get_main_queue(), ^{
+            UIViewController *strongHost = weakHost;
+            if (!ok) {
+                wq_remove_export(outDir);
+                wq_clear_in_flight(strongHost);
+                if (wq_share_host_is_active(strongHost)) {
+                    wq_alert(strongHost, @"Cannot share", error ?: @"Could not create a temporary export folder");
+                }
+                return;
+            }
+            if (!wq_share_host_is_active(strongHost) ||
+                !wq_present_share(strongHost, tmp, outDir, source)) {
+                wq_remove_export(outDir);
+            }
+            wq_clear_in_flight(strongHost);
+        });
+    });
+}
+
+static NSString *wq_zip_name(NSString *dir);
+
+// Zips a folder (the system's own zipper via NSFileCoordinator) and opens the
+// share sheet, so a backup can go out over AirDrop, Files, Mail…
+void wq_share_folder(UIViewController *host, NSString *dir, NSString *zipName, UIView *source)
+{
+    if (!wq_share_host_is_active(host)) return;
+    if (wq_share_in_flight(host)) {
+        wq_alert(host, @"Share in progress", @"Wait for the current share to finish before starting another.");
+        return;
+    }
+    WQSharePreparation *preparation = [WQSharePreparation new];
+    preparation.host = host;
+    UIAlertController *hud = wq_alert_controller(@"Preparing…", @"Compressing the folder", UIAlertControllerStyleAlert);
+    [hud addAction:wq_alert_action(@"Cancel", UIAlertActionStyleCancel, ^(UIAlertAction *__unused action) {
+        preparation.cancelled = YES;
+        objc_setAssociatedObject(host, &kWQSharePreparationKey, nil, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
+        [host dismissViewControllerAnimated:YES completion:nil];
+    })];
+    preparation.hud = hud;
+    objc_setAssociatedObject(host, &kWQSharePreparationKey, preparation, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
+    [host presentViewController:hud animated:YES completion:nil];
+    dispatch_async(wq_io(), ^{
+        if (preparation.isCancelled) return;
+        NSString *resolvedName = zipName ?: wq_zip_name(dir);
+        NSString *safe = [[resolvedName componentsSeparatedByCharactersInSet:
+                           [NSCharacterSet characterSetWithCharactersInString:@"/:"]] componentsJoinedByString:@"-"];
+        NSString *outDir = wq_unique_export_directory();
+        preparation.exportDir = outDir;
+        NSString *zip = outDir ? [outDir stringByAppendingPathComponent:[safe stringByAppendingPathExtension:@"zip"]] : nil;
+        NSFileManager *fm = NSFileManager.defaultManager;
+        wq_grant(dir);
+        __block NSError *copyError = nil;
+        NSError *coordError = nil;
+        if (zip && !preparation.isCancelled) {
+            [[NSFileCoordinator new] coordinateReadingItemAtURL:[NSURL fileURLWithPath:dir]
+                                                        options:NSFileCoordinatorReadingForUploading
+                                                          error:&coordError byAccessor:^(NSURL *zipped) {
+                if (!preparation.isCancelled) [fm copyItemAtURL:zipped toURL:[NSURL fileURLWithPath:zip] error:&copyError];
+            }];
+        }
+        BOOL ok = zip && !preparation.isCancelled && [fm fileExistsAtPath:zip];
+        NSString *why = (coordError ?: copyError).localizedDescription ?: @"Could not create the ZIP";
+        wq_log(@"share zip: %@ -> %@ %@", dir, zip.lastPathComponent, ok ? @"OK" : why);
+        dispatch_async(dispatch_get_main_queue(), ^{
+            UIViewController *strongHost = preparation.host;
+            BOOL hudPresented = strongHost && strongHost.presentedViewController == hud;
+            void (^finish)(void) = ^{
+                BOOL stale = preparation.isCancelled || !wq_share_host_is_active(strongHost);
+                wq_clear_preparation(strongHost, preparation);
+                if (!ok || stale) {
+                    wq_remove_export(outDir);
+                    if (!stale && wq_share_host_is_active(strongHost)) {
+                        wq_alert(strongHost, @"Cannot share", why);
+                    }
+                    return;
+                }
+                if (!wq_present_share(strongHost, zip, outDir, source)) wq_remove_export(outDir);
+            };
+            if (hudPresented) [strongHost dismissViewControllerAnimated:YES completion:finish];
+            else finish();
+        });
+    });
+}
+
+// "Santander 2026-11-09 14.02.11" for AppBackups/<bundle id>/<date>, else the folder name.
+static NSString *wq_zip_name(NSString *dir)
+{
+    NSArray *parts = dir.pathComponents;
+    NSUInteger i = [parts indexOfObject:@"AppBackups"];
+    if (i != NSNotFound && i + 2 == parts.count - 1) {
+        NSString *bid = parts[i + 1];
+        return [NSString stringWithFormat:@"%@ %@", wq_display_name(bid) ?: bid, parts.lastObject];
+    }
+    if (i != NSNotFound && i + 1 == parts.count - 1) {
+        NSString *bid = parts.lastObject;
+        return [NSString stringWithFormat:@"%@ backups", wq_display_name(bid) ?: bid];
+    }
+    return dir.lastPathComponent;
+}

source/hook/src/WQSyntax.h

@@ -0,0 +1,42 @@
+//
+//  WQSyntax.h
+//  WQ Files
+//
+//  Small syntax highlighter for the text viewer: one regular expression per
+//  language finds comments, strings, numbers, keywords and tags left to right
+//  (so a "//" inside a string stays part of the string). Foundation only; the
+//  viewer maps the token kinds to colors.
+//
+
+#import <Foundation/Foundation.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+typedef NS_ENUM(uint8_t, WQSyntaxKind) {
+    WQSyntaxComment = 1,
+    WQSyntaxString,
+    WQSyntaxKey,          // JSON keys, CSS properties, INI/YAML keys
+    WQSyntaxKeyword,
+    WQSyntaxNumber,
+    WQSyntaxTag,          // XML/HTML tag names, CSS selectors
+    WQSyntaxAttribute,    // XML attributes
+    WQSyntaxPreprocessor, // #include, @media, shebang
+};
+
+typedef struct {
+    NSRange range;
+    WQSyntaxKind kind;
+} WQSyntaxToken;
+
+// Larger texts are shown plain (matching would take too long).
+extern const NSUInteger kWQSyntaxMaxLength;
+
+// The language for a file, from its name (and for files without an extension,
+// a "#!" first line), or nil for plain text.
+NSString *_Nullable wq_syntax_language(NSString *fileName, NSString *_Nullable text);
+
+// Tokens (WQSyntaxToken structs, in text order) for text in language, or nil
+// when the language is unknown, the text is too long, or cancelled() says so.
+NSData *_Nullable wq_syntax_tokens(NSString *text, NSString *language, BOOL (^_Nullable cancelled)(void));
+
+NS_ASSUME_NONNULL_END

source/hook/src/WQSyntax.m

@@ -0,0 +1,295 @@
+//
+//  WQSyntax.m
+//  WQ Files
+//
+
+#import "WQSyntax.h"
+
+const NSUInteger kWQSyntaxMaxLength = 1024 * 1024;
+
+// Each rule is @[kind, pattern], the pattern with non-capturing groups only;
+// the combined expression wraps every rule in one capture group, so the group
+// that matched gives the token kind. Earlier rules win where two could start
+// at one place.
+
+static NSString *const kDQ = @"\"(?:[^\"\\\\\\n]|\\\\.)*\"";   // "…" on one line, with escapes
+static NSString *const kSQ = @"'(?:[^'\\\\\\n]|\\\\.)*'";
+static NSString *const kBQ = @"`(?:[^`\\\\]|\\\\.)*`";
+static NSString *const kNumber = @"\\b(?:0[xX][0-9a-fA-F_]+|0[bB][01_]+|\\d[\\d_]*(?:\\.\\d+)?(?:[eE][+-]?\\d+)?)[uUlLfF]*\\b";
+static NSString *const kSlashComments = @"//[^\\n]*|/\\*[\\s\\S]*?(?:\\*/|$(?![\\s\\S]))";
+static NSString *const kHashComment = @"#[^\\n]*";
+
+static NSString *wq_words(NSString *words)
+{
+    NSArray *list = [words componentsSeparatedByCharactersInSet:NSCharacterSet.whitespaceAndNewlineCharacterSet];
+    list = [list filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"length > 0"]];
+    return [NSString stringWithFormat:@"\\b(?:%@)\\b", [list componentsJoinedByString:@"|"]];
+}
+
+static NSString *const kCKeywords =
+    @"auto break case char const continue default do double else enum extern float for goto if inline int long "
+     "register restrict return short signed sizeof static struct switch typedef union unsigned void volatile while "
+     "bool true false NULL nullptr class namespace template typename public private protected virtual override "
+     "new delete this try catch throw using operator const_cast static_cast dynamic_cast reinterpret_cast "
+     "id self super nil Nil YES NO BOOL SEL IMP instancetype nonatomic atomic strong weak copy assign readonly readwrite "
+     "nullable nonnull _Nullable _Nonnull __weak __strong __block";
+static NSString *const kObjCDirectives = @"@(?:interface|implementation|end|protocol|property|synthesize|dynamic|class|"
+     "selector|encode|optional|required|import|autoreleasepool|synchronized|try|catch|finally|throw|available)\\b";
+static NSString *const kJSKeywords =
+    @"async await break case catch class const continue debugger default delete do else export extends false finally "
+     "for function if import in instanceof let new null of return static super switch this throw true try typeof "
+     "undefined var void while with yield interface type enum implements readonly private public protected "
+     "abstract declare namespace as any number string boolean never unknown";
+static NSString *const kSwiftKeywords =
+    @"associatedtype class deinit enum extension fileprivate func import init inout internal let open operator private "
+     "protocol public rethrows static struct subscript typealias var break case continue default defer do else "
+     "fallthrough for guard if in repeat return switch where while as catch false is nil super self Self throw "
+     "throws true try async await some any final lazy override mutating weak unowned convenience required";
+static NSString *const kJavaKeywords =
+    @"abstract assert boolean break byte case catch char class const continue default do double else enum extends "
+     "final finally float for goto if implements import instanceof int interface long native new package private "
+     "protected public return short static strictfp super switch synchronized this throw throws transient try void "
+     "volatile while true false null var val fun object when is in override data sealed companion suspend";
+static NSString *const kGoKeywords =
+    @"break case chan const continue default defer else fallthrough for func go goto if import interface map "
+     "package range return select struct switch type var true false nil iota";
+static NSString *const kRustKeywords =
+    @"as async await break const continue crate dyn else enum extern false fn for if impl in let loop match mod move "
+     "mut pub ref return self Self static struct super trait true type unsafe use where while";
+static NSString *const kPythonKeywords =
+    @"and as assert async await break class continue def del elif else except False finally for from global if "
+     "import in is lambda None nonlocal not or pass raise return True try while with yield self";
+static NSString *const kShellKeywords =
+    @"if then else elif fi case esac for select while until do done in function return exit export local readonly "
+     "declare unset shift source alias echo printf cd test set eval exec trap break continue true false";
+static NSString *const kRubyKeywords =
+    @"alias and begin break case class def defined do else elsif end ensure false for if in module next nil not or "
+     "redo rescue retry return self super then true undef unless until when while yield require attr_accessor";
+static NSString *const kSQLKeywords =
+    @"select from where and or not insert into values update set delete create table index view trigger drop alter "
+     "add column primary key foreign references unique null default join left right inner outer full cross on as "
+     "order by group having limit offset distinct union all exists in is like glob between case when then else end "
+     "begin commit rollback transaction pragma integer text real blob numeric asc desc if replace without rowid "
+     "autoincrement check constraint collate cast";
+static NSString *const kLuaKeywords =
+    @"and break do else elseif end false for function goto if in local nil not or repeat return then true until while";
+
+// Rules per language family: @[@[kind, pattern], …] and regex options.
+static NSArray *wq_language_rules(NSString *language, NSRegularExpressionOptions *options)
+{
+    *options = NSRegularExpressionAnchorsMatchLines;
+    if ([language isEqualToString:@"xml"]) {
+        return @[
+            @[@(WQSyntaxComment), @"<!--[\\s\\S]*?(?:-->|$(?![\\s\\S]))"],
+            @[@(WQSyntaxString), @"<!\\[CDATA\\[[\\s\\S]*?\\]\\]>"],
+            @[@(WQSyntaxPreprocessor), @"<[?!][^>]*>"],
+            @[@(WQSyntaxTag), @"</?[A-Za-z_][\\w:.-]*|/?>"],
+            @[@(WQSyntaxAttribute), @"\\b[A-Za-z_][\\w:.-]*(?=\\s*=\\s*[\"'])"],
+            @[@(WQSyntaxString), @"\"[^\"<]*\"|'[^'<]*'"],
+            @[@(WQSyntaxKeyword), @"&#?\\w+;"],
+        ];
+    }
+    if ([language isEqualToString:@"json"]) {
+        return @[
+            @[@(WQSyntaxComment), kSlashComments],   // JSON5 / JSONC
+            @[@(WQSyntaxKey), [kDQ stringByAppendingString:@"(?=\\s*:)"]],
+            @[@(WQSyntaxString), kDQ],
+            @[@(WQSyntaxKeyword), @"\\b(?:true|false|null)\\b"],
+            @[@(WQSyntaxNumber), @"-?\\b\\d+(?:\\.\\d+)?(?:[eE][+-]?\\d+)?\\b"],
+        ];
+    }
+    if ([language isEqualToString:@"css"]) {
+        return @[
+            @[@(WQSyntaxComment), @"/\\*[\\s\\S]*?(?:\\*/|$(?![\\s\\S]))"],
+            @[@(WQSyntaxString), [NSString stringWithFormat:@"%@|%@", kDQ, kSQ]],
+            @[@(WQSyntaxPreprocessor), @"@[\\w-]+"],
+            @[@(WQSyntaxKey), @"(?<![\\w-])-{0,2}[A-Za-z][\\w-]*(?=\\s*:(?![:\\w]*\\s*\\{))"],
+            @[@(WQSyntaxNumber), @"#[0-9a-fA-F]{3,8}\\b|-?\\b\\d+(?:\\.\\d+)?(?:px|em|rem|%|vh|vw|s|ms|pt|deg)?"],
+            @[@(WQSyntaxKeyword), @"!important\\b"],
+            @[@(WQSyntaxTag), @"[.#]?[A-Za-z_][\\w-]*(?=[^{};]*\\{)"],
+        ];
+    }
+    if ([language isEqualToString:@"sql"]) {
+        *options |= NSRegularExpressionCaseInsensitive;
+        return @[
+            @[@(WQSyntaxComment), @"--[^\\n]*|/\\*[\\s\\S]*?(?:\\*/|$(?![\\s\\S]))"],
+            @[@(WQSyntaxString), @"'(?:[^']|'')*'"],
+            @[@(WQSyntaxKey), @"\"(?:[^\"]|\"\")*\"|`[^`]*`|\\[[^\\]\\n]*\\]"],
+            @[@(WQSyntaxKeyword), wq_words(kSQLKeywords)],
+            @[@(WQSyntaxNumber), kNumber],
+        ];
+    }
+    if ([language isEqualToString:@"ini"]) {
+        return @[
+            @[@(WQSyntaxComment), @"^\\s*[#;][^\\n]*"],
+            @[@(WQSyntaxTag), @"^\\s*\\[[^\\]\\n]*\\]"],
+            @[@(WQSyntaxKey), @"^\\s*[\\w.$-]+(?=\\s*[=:])"],
+            @[@(WQSyntaxString), [NSString stringWithFormat:@"%@|%@", kDQ, kSQ]],
+            @[@(WQSyntaxKeyword), @"\\b(?:true|false|yes|no|on|off|null)\\b"],
+            @[@(WQSyntaxNumber), kNumber],
+        ];
+    }
+    if ([language isEqualToString:@"yaml"]) {
+        return @[
+            @[@(WQSyntaxComment), @"(?:^|(?<=\\s))#[^\\n]*"],
+            @[@(WQSyntaxPreprocessor), @"^(?:---|\\.\\.\\.)\\s*$"],
+            @[@(WQSyntaxKey), @"^\\s*(?:-\\s+)?[^\\s#:\\-\"'][^:#\\n]*(?=:(?:\\s|$))"],
+            @[@(WQSyntaxString), [NSString stringWithFormat:@"%@|%@", kDQ, kSQ]],
+            @[@(WQSyntaxKeyword), @"\\b(?:true|false|yes|no|on|off|null)\\b|~"],
+            @[@(WQSyntaxNumber), kNumber],
+        ];
+    }
+    if ([language isEqualToString:@"markdown"]) {
+        return @[
+            @[@(WQSyntaxString), @"^```[\\s\\S]*?(?:^```|$(?![\\s\\S]))|`[^`\\n]+`"],
+            @[@(WQSyntaxKeyword), @"^#{1,6}[^\\n]*"],
+            @[@(WQSyntaxTag), @"\\[[^\\]\\n]*\\]\\([^)\\n]*\\)"],
+            @[@(WQSyntaxAttribute), @"\\*\\*[^*\\n]+\\*\\*|__[^_\\n]+__"],
+            @[@(WQSyntaxComment), @"^>[^\\n]*"],
+            @[@(WQSyntaxNumber), @"^\\s*(?:[-*+]|\\d+\\.)(?=\\s)"],
+        ];
+    }
+    // Hash-comment languages.
+    NSDictionary *hash = @{ @"python": kPythonKeywords, @"shell": kShellKeywords, @"ruby": kRubyKeywords };
+    if (hash[language]) {
+        NSString *strings = [language isEqualToString:@"python"]
+            ? [NSString stringWithFormat:@"(?:[rRbBfFuU]{0,2})(?:\"\"\"[\\s\\S]*?(?:\"\"\"|$(?![\\s\\S]))|'''[\\s\\S]*?(?:'''|$(?![\\s\\S]))|%@|%@)", kDQ, kSQ]
+            : [NSString stringWithFormat:@"%@|%@|%@", kDQ, kSQ, kBQ];
+        return @[
+            @[@(WQSyntaxPreprocessor), @"\\A#![^\\n]*"],
+            @[@(WQSyntaxComment), [language isEqualToString:@"shell"] ? @"(?:^|(?<=[\\s;]))#[^\\n]*" : kHashComment],
+            @[@(WQSyntaxString), strings],
+            @[@(WQSyntaxPreprocessor), [language isEqualToString:@"python"] ? @"^\\s*@[\\w.]+" : @"\\$\\{[^}\\n]*\\}|\\$[\\w@#?$!*-]"],
+            @[@(WQSyntaxKeyword), wq_words(hash[language])],
+            @[@(WQSyntaxNumber), kNumber],
+        ];
+    }
+    if ([language isEqualToString:@"lua"]) {
+        return @[
+            @[@(WQSyntaxComment), @"--\\[\\[[\\s\\S]*?(?:\\]\\]|$(?![\\s\\S]))|--[^\\n]*"],
+            @[@(WQSyntaxString), [NSString stringWithFormat:@"\\[\\[[\\s\\S]*?\\]\\]|%@|%@", kDQ, kSQ]],
+            @[@(WQSyntaxKeyword), wq_words(kLuaKeywords)],
+            @[@(WQSyntaxNumber), kNumber],
+        ];
+    }
+    // C-like languages.
+    NSDictionary *cLike = @{ @"c": kCKeywords, @"js": kJSKeywords, @"swift": kSwiftKeywords, @"java": kJavaKeywords,
+                             @"go": kGoKeywords, @"rust": kRustKeywords };
+    if (cLike[language]) {
+        BOOL c = [language isEqualToString:@"c"];
+        NSString *strings = c ? [NSString stringWithFormat:@"@?%@|%@", kDQ, kSQ]
+            : [language isEqualToString:@"swift"] ? [NSString stringWithFormat:@"\"\"\"[\\s\\S]*?(?:\"\"\"|$(?![\\s\\S]))|%@", kDQ]
+            : [NSString stringWithFormat:@"%@|%@|%@", kDQ, kSQ, kBQ];
+        return @[
+            @[@(WQSyntaxComment), kSlashComments],
+            @[@(WQSyntaxString), strings],
+            @[@(WQSyntaxPreprocessor), c ? [@"^\\s*#\\s*\\w+|" stringByAppendingString:kObjCDirectives]
+                                         : @"^\\s*#!\\[?[^\\n]*|@[A-Za-z_]\\w*"],
+            @[@(WQSyntaxKeyword), wq_words(cLike[language])],
+            @[@(WQSyntaxNumber), kNumber],
+        ];
+    }
+    return nil;
+}
+
+NSString *wq_syntax_language(NSString *fileName, NSString *text)
+{
+    static NSDictionary<NSString *, NSString *> *byExtension;
+    static dispatch_once_t once;
+    dispatch_once(&once, ^{
+        NSMutableDictionary *map = [NSMutableDictionary new];
+        void (^add)(NSString *, NSString *) = ^(NSString *language, NSString *extensions) {
+            for (NSString *e in [extensions componentsSeparatedByString:@" "]) map[e] = language;
+        };
+        add(@"xml", @"xml plist html htm xhtml svg xib storyboard entitlements mobileconfig xsd xsl rss atom");
+        add(@"json", @"json jsonc json5 geojson webmanifest har ipynb");
+        add(@"css", @"css scss less");
+        add(@"sql", @"sql");
+        add(@"ini", @"ini cfg conf toml properties env gitconfig editorconfig");
+        add(@"yaml", @"yaml yml");
+        add(@"markdown", @"md markdown");
+        add(@"python", @"py pyw pyi");
+        add(@"shell", @"sh bash zsh ksh command profile bashrc zshrc");
+        add(@"ruby", @"rb gemspec podspec");
+        add(@"lua", @"lua");
+        add(@"c", @"c h m mm cc cpp cxx hpp hh hxx metal strings");
+        add(@"js", @"js mjs cjs jsx ts tsx");
+        add(@"swift", @"swift");
+        add(@"java", @"java kt kts gradle groovy scala dart cs");
+        add(@"go", @"go");
+        add(@"rust", @"rs");
+        byExtension = map;
+    });
+    NSString *ext = fileName.pathExtension.lowercaseString;
+    if (!ext.length && [fileName hasPrefix:@"."]) ext = [fileName substringFromIndex:1].lowercaseString;   // .zshrc
+    NSString *language = ext.length ? byExtension[ext] : nil;
+    if (language) return language;
+    if (!text.length) return nil;
+    // No known extension: a shebang, or text that looks like XML or JSON.
+    NSString *head = [text substringToIndex:MIN(text.length, (NSUInteger)200)];
+    NSString *trimmed = [head stringByTrimmingCharactersInSet:NSCharacterSet.whitespaceAndNewlineCharacterSet];
+    if ([trimmed hasPrefix:@"#!"]) {
+        NSString *line = [trimmed componentsSeparatedByString:@"\n"].firstObject;
+        if ([line containsString:@"python"]) return @"python";
+        if ([line containsString:@"ruby"]) return @"ruby";
+        if ([line containsString:@"node"]) return @"js";
+        if ([line containsString:@"lua"]) return @"lua";
+        return @"shell";
+    }
+    if ([trimmed hasPrefix:@"<?xml"] || [trimmed hasPrefix:@"<!DOCTYPE"] || [trimmed hasPrefix:@"<plist"]) return @"xml";
+    if (([trimmed hasPrefix:@"{"] || [trimmed hasPrefix:@"["]) && ext.length == 0 &&
+        [NSJSONSerialization JSONObjectWithData:[text dataUsingEncoding:NSUTF8StringEncoding] ?: [NSData data]
+                                        options:NSJSONReadingFragmentsAllowed error:nil])
+        return @"json";
+    return nil;
+}
+
+NSData *wq_syntax_tokens(NSString *text, NSString *language, BOOL (^cancelled)(void))
+{
+    if (text.length > kWQSyntaxMaxLength) return nil;
+    static NSMutableDictionary<NSString *, id> *cache;
+    static NSMutableDictionary<NSString *, NSArray *> *kindsCache;
+    static NSObject *lock;
+    static dispatch_once_t once;
+    dispatch_once(&once, ^{ cache = [NSMutableDictionary new]; kindsCache = [NSMutableDictionary new]; lock = [NSObject new]; });
+    NSRegularExpression *regex = nil;
+    NSArray<NSNumber *> *kinds = nil;
+    @synchronized (lock) {
+        id cached = cache[language];
+        if (!cached) {
+            NSRegularExpressionOptions options = 0;
+            NSArray *rules = wq_language_rules(language, &options);
+            NSMutableArray *parts = [NSMutableArray new], *ruleKinds = [NSMutableArray new];
+            for (NSArray *rule in rules) {
+                [parts addObject:[NSString stringWithFormat:@"(%@)", rule[1]]];
+                [ruleKinds addObject:rule[0]];
+            }
+            NSError *error = nil;
+            NSRegularExpression *built = rules.count
+                ? [NSRegularExpression regularExpressionWithPattern:[parts componentsJoinedByString:@"|"] options:options error:&error]
+                : nil;
+            if (rules.count && !built) NSLog(@"WQSyntax: %@ pattern failed: %@", language, error);
+            cached = built ?: NSNull.null;
+            cache[language] = cached;
+            if (built) kindsCache[language] = ruleKinds;
+        }
+        if (cached != NSNull.null) { regex = cached; kinds = kindsCache[language]; }
+    }
+    if (!regex) return nil;
+    NSMutableData *tokens = [NSMutableData new];
+    __block BOOL stopped = NO;
+    __block NSUInteger checked = 0;
+    [regex enumerateMatchesInString:text options:0 range:NSMakeRange(0, text.length)
+                         usingBlock:^(NSTextCheckingResult *match, NSMatchingFlags __unused flags, BOOL *stop) {
+        if (cancelled && ++checked % 512 == 0 && cancelled()) { stopped = YES; *stop = YES; return; }
+        if (!match || match.range.length == 0) return;
+        for (NSUInteger g = 1; g < match.numberOfRanges && g <= kinds.count; g++) {
+            NSRange r = [match rangeAtIndex:g];
+            if (r.location == NSNotFound) continue;
+            WQSyntaxToken token = { r, (WQSyntaxKind)kinds[g - 1].unsignedCharValue };
+            [tokens appendBytes:&token length:sizeof(token)];
+            break;
+        }
+    }];
+    return stopped ? nil : tokens;
+}

source/hook/src/WQUI.h

@@ -0,0 +1,37 @@
+//
+//  WQUI.h
+//  WQ Files shared UI helpers
+//
+
+#import <UIKit/UIKit.h>
+#import "WQLocalization.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+static inline UIBarButtonItemStyle wq_primary_button_style(void)
+{
+    if (@available(iOS 26.0, *)) return UIBarButtonItemStyleProminent;
+    return UIBarButtonItemStylePlain;
+}
+
+dispatch_queue_t wq_io(void);
+void wq_alert(UIViewController *host, NSString *title, NSString *_Nullable message);
+// Settings → Allow Deleting (on by default). When off, every delete, clear and
+// clean action is hidden or refused.
+BOOL wq_deleting_allowed(void);
+void wq_set_deleting_allowed(BOOL allowed);
+// Settings → Keep Data Before Restore (on by default). When off, the safety
+// backup an app restore makes first is deleted once the restore succeeded.
+BOOL wq_keep_before_restore(void);
+void wq_set_keep_before_restore(BOOL keep);
+// YES (after telling the user) when deleting is turned off.
+BOOL wq_refuse_if_deleting_off(UIViewController *host);
+UIAlertController *wq_alert_controller(NSString *_Nullable title, NSString *_Nullable message, UIAlertControllerStyle style);
+UIAlertAction *wq_alert_action(NSString *title, UIAlertActionStyle style, void (^_Nullable handler)(UIAlertAction *));
+NSString *wq_size_text(unsigned long long size);
+UIView *wq_device_header(CGFloat width);
+// "iPhone 17 Pro Max (iPhone18,2) · iOS 27.0.1 (24A446)"
+NSString *wq_device_line(void);
+UIImage *_Nullable wq_app_icon(NSString *_Nullable bundleID);
+
+NS_ASSUME_NONNULL_END

source/hook/src/WQUI.m

@@ -0,0 +1,354 @@
+//
+//  WQUI.m
+//  WQ Files shared UI helpers
+//  GPL-3.0-or-later.
+//
+
+#import "WQUI.h"
+#import "WQAccess.h"
+#import "WQLaunchServices.h"
+#import <fcntl.h>
+#import <sys/sysctl.h>
+#import <sys/utsname.h>
+
+// "iPhone 17 Pro Max (iPhone18,2)\niOS 27.0.1 (24A446)"
+NSString *wq_device_line(void)
+{
+    struct utsname u;
+    NSString *machine = (uname(&u) == 0) ? @(u.machine) : @"unknown";
+    char build[64] = {0};
+    size_t len = sizeof(build);
+    NSString *buildStr = (sysctlbyname("kern.osversion", build, &len, NULL, 0) == 0) ? @(build) : nil;
+    NSDictionary *names = @{
+        @"iPhone17,1": @"iPhone 16 Pro", @"iPhone17,2": @"iPhone 16 Pro Max",
+        @"iPhone17,3": @"iPhone 16", @"iPhone17,4": @"iPhone 16 Plus", @"iPhone17,5": @"iPhone 16e",
+        @"iPhone18,1": @"iPhone 17 Pro", @"iPhone18,2": @"iPhone 17 Pro Max",
+        @"iPhone18,3": @"iPhone 17", @"iPhone18,4": @"iPhone Air",
+    };
+    NSString *marketing = names[machine];
+    NSString *model = marketing ? [NSString stringWithFormat:@"%@ (%@)", marketing, machine] : machine;
+    NSString *ver = UIDevice.currentDevice.systemVersion;
+    return buildStr ? [NSString stringWithFormat:@"%@ · iOS %@ (%@)", model, ver, buildStr]
+                    : [NSString stringWithFormat:@"%@ · iOS %@", model, ver];
+}
+
+// A small centered label with the device/iOS line, for a table header.
+UIView *wq_device_header(CGFloat width)
+{
+    UIView *box = [[UIView alloc] initWithFrame:CGRectMake(0, 0, width, 50)];
+    UILabel *header = [UILabel new];
+    header.numberOfLines = 0;
+    header.textAlignment = NSTextAlignmentCenter;
+    header.font = [UIFont monospacedSystemFontOfSize:11 weight:UIFontWeightMedium];
+    header.textColor = UIColor.secondaryLabelColor;
+    header.backgroundColor = UIColor.secondarySystemBackgroundColor;
+    header.text = wq_device_line();
+    header.frame = CGRectMake(0, 0, width, 34);
+    header.autoresizingMask = UIViewAutoresizingFlexibleWidth;
+    [box addSubview:header];  // 16 pt of clear space below the strip
+    return box;
+}
+
+// Private: app icon by bundle id (in UIKit; guarded with respondsToSelector).
+@interface UIImage (WQPrivate)
++ (UIImage *)_applicationIconImageForBundleIdentifier:(NSString *)bid format:(int)fmt scale:(CGFloat)scale;
+@end
+
+// Small grey fingerprint of an icon, to recognise iOS's blank placeholder.
+static NSData *wq_icon_fingerprint(UIImage *img)
+{
+    const size_t s = 12;
+    uint8_t px[12 * 12 * 4] = {0};
+    CGColorSpaceRef cs = CGColorSpaceCreateDeviceRGB();
+    CGContextRef ctx = CGBitmapContextCreate(px, s, s, 8, s * 4, cs, (CGBitmapInfo)kCGImageAlphaPremultipliedLast);
+    CGColorSpaceRelease(cs);
+    if (!ctx) return nil;
+    if (img.CGImage) CGContextDrawImage(ctx, CGRectMake(0, 0, s, s), img.CGImage);
+    CGContextRelease(ctx);
+    return [NSData dataWithBytes:px length:sizeof(px)];
+}
+
+static UIImage *wq_raw_icon(NSString *bundleID)
+{
+    if (![UIImage respondsToSelector:@selector(_applicationIconImageForBundleIdentifier:format:scale:)]) return nil;
+    CGFloat scale = 2.0; // Safe fallback for background preparation without UI context.
+    if (NSThread.isMainThread) {
+        for (UIScene *scene in UIApplication.sharedApplication.connectedScenes) {
+            if ([scene isKindOfClass:UIWindowScene.class] && scene.activationState == UISceneActivationStateForegroundActive) {
+                scale = ((UIWindowScene *)scene).screen.scale;
+                break;
+            }
+        }
+    }
+    return [UIImage _applicationIconImageForBundleIdentifier:bundleID format:2 scale:scale];
+}
+
+// The real icon for bundleID, or nil when iOS only has its placeholder.
+static UIImage *wq_real_icon(NSString *bundleID)
+{
+    static NSData *placeholder;
+    static dispatch_once_t once;
+    dispatch_once(&once, ^{ placeholder = wq_icon_fingerprint(wq_raw_icon(@"cz.kolbi.wqfiles.no-such-app")); });
+    UIImage *raw = wq_raw_icon(bundleID);
+    if (!raw || !raw.CGImage) return nil;
+    NSData *fp = wq_icon_fingerprint(raw);
+    if (!placeholder || fp.length != placeholder.length) return raw;
+    // Near-identical to the placeholder (allow small rendering differences).
+    const uint8_t *a = fp.bytes, *b = placeholder.bytes;
+    unsigned long diff = 0;
+    for (NSUInteger i = 0; i < fp.length; i++) diff += (unsigned long)abs((int)a[i] - (int)b[i]);
+    return diff / fp.length < 8 ? nil : raw;
+}
+
+// The icon from the app's own bundle, for when iOS only hands out its
+// placeholder (iOS 26 refuses this app's icon requests). Reads the primary
+// icon names from Info.plist and loads the matching PNG files.
+// The first few outcomes go to the Log, to see why icons are missing.
+static void wq_icon_note(NSString *bundleID, NSString *what)
+{
+    static NSUInteger notes;
+    @synchronized (NSNull.null) {
+        if (notes >= 8) return;
+        notes++;
+    }
+    wq_log(@"icon: %@: %@", bundleID, what);
+}
+
+static UIImage *wq_bundle_icon(NSString *bundleID)
+{
+    NSString *path = wq_bundle_path_for_id(bundleID);
+    if (!path.length) { wq_icon_note(bundleID, @"no bundle path in the app database"); return nil; }
+    NSString *plistPath = [path stringByAppendingPathComponent:@"Info.plist"];
+    NSDictionary *info = [NSDictionary dictionaryWithContentsOfFile:plistPath];
+    if (!info && wq_grant(path)) info = [NSDictionary dictionaryWithContentsOfFile:plistPath];
+    if (![info isKindOfClass:NSDictionary.class]) {
+        int fd = open(plistPath.fileSystemRepresentation, O_RDONLY);
+        int err = fd < 0 ? errno : 0;
+        if (fd >= 0) close(fd);
+        wq_icon_note(bundleID, [NSString stringWithFormat:@"can't read %@ (%s)", plistPath, err ? strerror(err) : "not a plist"]);
+        return nil;
+    }
+    NSMutableArray<NSString *> *names = [NSMutableArray new];
+    for (NSString *key in @[@"CFBundleIcons", @"CFBundleIcons~ipad"]) {
+        NSDictionary *primary = [info[key] isKindOfClass:NSDictionary.class] ? info[key][@"CFBundlePrimaryIcon"] : nil;
+        if (![primary isKindOfClass:NSDictionary.class]) continue;
+        if ([primary[@"CFBundleIconName"] isKindOfClass:NSString.class]) [names addObject:primary[@"CFBundleIconName"]];
+        NSArray *files = [primary[@"CFBundleIconFiles"] isKindOfClass:NSArray.class] ? primary[@"CFBundleIconFiles"] : @[];
+        for (id file in files.reverseObjectEnumerator) if ([file isKindOfClass:NSString.class]) [names addObject:file];
+    }
+    if ([info[@"CFBundleIconFile"] isKindOfClass:NSString.class]) [names addObject:info[@"CFBundleIconFile"]];
+    [names addObjectsFromArray:@[@"AppIcon60x60", @"AppIcon"]];
+    // Only the PNG files apps ship next to their asset catalog. Loading from
+    // the catalog (UIImage imageNamed:inBundle:) aborts inside UIKit when an
+    // entry exists but can't be rendered (crash on 27.0.1, build 21).
+    for (NSString *name in names) {
+        NSString *base = name.stringByDeletingPathExtension;
+        for (NSString *suffix in @[@"@3x.png", @"@2x.png", @"@2x~ipad.png", @"~ipad.png", @".png"]) {
+            UIImage *image = [UIImage imageWithContentsOfFile:[path stringByAppendingPathComponent:[base stringByAppendingString:suffix]]];
+            if (image.CGImage) {
+                wq_icon_note(bundleID, [NSString stringWithFormat:@"loaded %@%@ from the app", base, suffix]);
+                return image;
+            }
+        }
+    }
+    wq_icon_note(bundleID, [NSString stringWithFormat:@"no icon PNG in %@ (tried %@)", path.lastPathComponent,
+                            [names componentsJoinedByString:@", "]]);
+    return nil;
+}
+
+static UIImage *wq_round_icon(UIImage *raw)
+{
+    CGFloat s = 40;
+    UIGraphicsImageRenderer *r = [[UIGraphicsImageRenderer alloc] initWithSize:CGSizeMake(s, s)];
+    return [r imageWithActions:^(UIGraphicsImageRendererContext *__unused ctx) {
+        [[UIBezierPath bezierPathWithRoundedRect:CGRectMake(0, 0, s, s) cornerRadius:s * 0.225] addClip];
+        [raw drawInRect:CGRectMake(0, 0, s, s)];
+    }];
+}
+
+// Symbol tile for system services and extensions that have no icon at all,
+// picked from keywords in the bundle id.
+static UIImage *wq_service_tile(NSString *bundleID)
+{
+    static NSArray<NSArray *> *rules;
+    static NSCache *tiles;
+    static dispatch_once_t once;
+    dispatch_once(&once, ^{
+        tiles = [NSCache new];
+        UIColor *blue = UIColor.systemBlueColor, *green = UIColor.systemGreenColor, *red = UIColor.systemRedColor,
+                *orange = UIColor.systemOrangeColor, *purple = UIColor.systemPurpleColor, *indigo = UIColor.systemIndigoColor,
+                *teal = UIColor.systemTealColor, *pink = UIColor.systemPinkColor, *gray = UIColor.systemGrayColor;
+        // keywords (lower case, any match), symbol, colour
+        rules = @[
+            @[@[@"emoji"], @"face.smiling.inverse", orange],
+            @[@[@"keyboard", @"inputui", @"textinput", @"dictation"], @"keyboard.fill", gray],
+            @[@[@"airdrop", @"sharing", @"sharesheet"], @"antenna.radiowaves.left.and.right", blue],
+            @[@[@"widget", @"chrono"], @"square.grid.2x2.fill", blue],
+            @[@[@"screenshot", @"screencapture", @"screenrecord"], @"camera.viewfinder", indigo],
+            @[@[@"poster", @"wallpaper"], @"photo.on.rectangle.angled", purple],
+            @[@[@"siri", @"assistant"], @"waveform", indigo],
+            @[@[@"camera"], @"camera.fill", gray],
+            @[@[@"photo"], @"photo.fill", orange],
+            @[@[@"music", @"audio", @"shazam", @"musicrecognition"], @"music.note", pink],
+            @[@[@"headphone", @"airpods", @"bluetooth"], @"headphones", gray],
+            @[@[@"hearing"], @"ear.fill", blue],
+            @[@[@"weather"], @"cloud.sun.fill", teal],
+            @[@[@"location", @"maps", @"navigation"], @"location.fill", blue],
+            @[@[@"health", @"fitness", @"workout"], @"heart.fill", red],
+            @[@[@"pay", @"wallet", @"passbook", @"cash", @"finance"], @"creditcard.fill", green],
+            @[@[@"mail"], @"envelope.fill", blue],
+            @[@[@"message", @"sms", @"imessage"], @"message.fill", green],
+            @[@[@"facetime", @"video"], @"video.fill", green],
+            @[@[@"phone", @"call", @"telephony"], @"phone.fill", green],
+            @[@[@"notification", @"usernotification", @"bulletin"], @"bell.fill", red],
+            @[@[@"shortcut", @"workflow", @"intent"], @"square.on.square", indigo],
+            @[@[@"safari", @"web"], @"safari.fill", blue],
+            @[@[@"news", @"stocks"], @"newspaper.fill", red],
+            @[@[@"calendar", @"event"], @"calendar", red],
+            @[@[@"note", @"paper"], @"note.text", orange],
+            @[@[@"reminder"], @"checklist", blue],
+            @[@[@"game"], @"gamecontroller.fill", purple],
+            @[@[@"auth", @"account", @"appsso", @"password", @"keychain", @"tcc", @"privacy"], @"lock.fill", gray],
+            @[@[@"print"], @"printer.fill", gray],
+            @[@[@"clarity", @"accessib"], @"accessibility", blue],
+            @[@[@"home"], @"house.fill", orange],
+            @[@[@"findmy", @"fmd", @"fmip"], @"location.circle.fill", green],
+            @[@[@"carplay", @"carradio", @"cartrip", @"car."], @"car.fill", gray],
+            @[@[@"tvremote", @"tvsetup", @"com.apple.tv"], @"tv.fill", gray],
+            @[@[@"book"], @"book.fill", orange],
+            @[@[@"podcast"], @"mic.fill", purple],
+            @[@[@"spotlight", @"search"], @"magnifyingglass", gray],
+            @[@[@"diagnostic", @"logging", @"crash", @"analytics"], @"stethoscope", gray],
+            @[@[@"font"], @"textformat", gray],
+            @[@[@"translate"], @"character.bubble.fill", blue],
+            @[@[@"file", @"document", @"cloud"], @"folder.fill", blue],
+            @[@[@"setup", @"buddy", @"onboarding"], @"gearshape.2.fill", gray],
+        ];
+    });
+    NSString *key = bundleID.lowercaseString;
+    NSString *symbol = @"gearshape.fill";
+    UIColor *color = UIColor.systemGrayColor;
+    for (NSArray *rule in rules) {
+        BOOL hit = NO;
+        for (NSString *word in rule[0]) if ([key containsString:word]) { hit = YES; break; }
+        if (hit) { symbol = rule[1]; color = rule[2]; break; }
+    }
+    NSString *cacheKey = [symbol stringByAppendingString:color.description];
+    UIImage *tile = [tiles objectForKey:cacheKey];
+    if (tile) return tile;
+    CGFloat s = 40;
+    UIGraphicsImageRenderer *r = [[UIGraphicsImageRenderer alloc] initWithSize:CGSizeMake(s, s)];
+    UIColor *fill = [color resolvedColorWithTraitCollection:[UITraitCollection traitCollectionWithUserInterfaceStyle:UIUserInterfaceStyleLight]];
+    tile = [r imageWithActions:^(UIGraphicsImageRendererContext *__unused ctx) {
+        [fill setFill];
+        [[UIBezierPath bezierPathWithRoundedRect:CGRectMake(0, 0, s, s) cornerRadius:s * 0.225] fill];
+        UIImageSymbolConfiguration *cfg = [UIImageSymbolConfiguration configurationWithPointSize:19 weight:UIImageSymbolWeightSemibold];
+        UIImage *g = [[UIImage systemImageNamed:symbol withConfiguration:cfg] ?: [UIImage systemImageNamed:@"gearshape.fill" withConfiguration:cfg]
+                      imageWithTintColor:UIColor.whiteColor renderingMode:UIImageRenderingModeAlwaysOriginal];
+        [g drawInRect:CGRectMake((s - g.size.width) / 2, (s - g.size.height) / 2, g.size.width, g.size.height)];
+    }];
+    [tiles setObject:tile forKey:cacheKey];
+    return tile;
+}
+
+// Rounded app icon for a bundle id, cached. Falls back to the closest parent
+// app's icon (extensions: com.foo.app.widget -> com.foo.app), then to a
+// neutral service tile. Nil only without a bundle id.
+UIImage *wq_app_icon(NSString *bundleID)
+{
+    if (!bundleID.length) return nil;
+    static NSCache *cache;
+    static dispatch_once_t once;
+    dispatch_once(&once, ^{ cache = [NSCache new]; });
+    UIImage *cached = [cache objectForKey:bundleID];
+    if (cached) return cached;
+    // The bundle fallback reads files and may ask for access: never on the
+    // main thread. Lists warm the cache from their background passes; a
+    // main-thread miss gets the tile without caching it.
+    BOOL background = !NSThread.isMainThread;
+    UIImage *system = wq_real_icon(bundleID);
+    if (system && background) wq_icon_note(bundleID, @"iOS returned an icon");
+    UIImage *raw = system ?: (background ? wq_bundle_icon(bundleID) : nil);
+    NSArray *parts = [bundleID componentsSeparatedByString:@"."];
+    for (NSInteger n = (NSInteger)parts.count - 1; !raw && n >= 3; n--)
+    {
+        NSString *parent = [[parts subarrayWithRange:NSMakeRange(0, (NSUInteger)n)] componentsJoinedByString:@"."];
+        raw = wq_real_icon(parent) ?: (background ? wq_bundle_icon(parent) : nil);
+    }
+    UIImage *icon = raw ? wq_round_icon(raw) : wq_service_tile(bundleID);
+    if (raw || background) [cache setObject:icon forKey:bundleID];
+    return icon;
+}
+
+dispatch_queue_t wq_io(void)
+{
+    static dispatch_queue_t queue;
+    static dispatch_once_t once;
+    dispatch_once(&once, ^{ queue = dispatch_queue_create("wqfiles.io", DISPATCH_QUEUE_SERIAL); });
+    return queue;
+}
+
+static NSString *const kWQDeletingDisabledPref = @"WQDeletingDisabled";
+
+BOOL wq_deleting_allowed(void)
+{
+    return ![NSUserDefaults.standardUserDefaults boolForKey:kWQDeletingDisabledPref];
+}
+
+void wq_set_deleting_allowed(BOOL allowed)
+{
+    [NSUserDefaults.standardUserDefaults setBool:!allowed forKey:kWQDeletingDisabledPref];
+}
+
+static NSString *const kWQDiscardBeforeRestorePref = @"WQDiscardBeforeRestore";
+
+BOOL wq_keep_before_restore(void)
+{
+    return ![NSUserDefaults.standardUserDefaults boolForKey:kWQDiscardBeforeRestorePref];
+}
+
+void wq_set_keep_before_restore(BOOL keep)
+{
+    [NSUserDefaults.standardUserDefaults setBool:!keep forKey:kWQDiscardBeforeRestorePref];
+}
+
+BOOL wq_refuse_if_deleting_off(UIViewController *host)
+{
+    if (wq_deleting_allowed()) return NO;
+    UIAlertController *alert = wq_alert_controller(@"Deleting is turned off",
+        @"Turn on Allow Deleting on the start screen of WQ Files to delete, clear or clean.", UIAlertControllerStyleAlert);
+    [alert addAction:wq_alert_action(@"OK", UIAlertActionStyleDefault, nil)];
+    [host presentViewController:alert animated:YES completion:nil];
+    return YES;
+}
+
+UIAlertController *wq_alert_controller(NSString *title, NSString *message, UIAlertControllerStyle style)
+{
+    return [UIAlertController alertControllerWithTitle:WQLocalizedNullable(title)
+                                               message:WQLocalizedNullable(message)
+                                        preferredStyle:style];
+}
+
+UIAlertAction *wq_alert_action(NSString *title, UIAlertActionStyle style, void (^handler)(UIAlertAction *))
+{
+    return [UIAlertAction actionWithTitle:WQLocalized(title) style:style handler:handler];
+}
+
+void wq_alert(UIViewController *host, NSString *title, NSString *message)
+{
+    if (!host || !host.isViewLoaded || !host.view.window) return;
+    UIWindowScene *scene = host.view.window.windowScene;
+    if (scene && scene.activationState != UISceneActivationStateForegroundActive) return;
+    UINavigationController *nav = host.navigationController;
+    if (nav && nav.topViewController != host) return;
+    if (host.presentedViewController && !host.presentedViewController.isBeingDismissed) return;
+    UIAlertController *alert = wq_alert_controller(title, message, UIAlertControllerStyleAlert);
+    [alert addAction:wq_alert_action(@"OK", UIAlertActionStyleDefault, nil)];
+    [host presentViewController:alert animated:YES completion:nil];
+}
+
+NSString *wq_size_text(unsigned long long size)
+{
+    if (size == 0) return @"0 KB";
+    return [NSByteCountFormatter stringFromByteCount:(long long)size countStyle:NSByteCountFormatterCountStyleFile];
+}