41 lines
1.9 KiB
Swift
41 lines
1.9 KiB
Swift
// tool.backup · BackupPane · ZipWriter · libarchive · —
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// 原语: 探测 · 进程内 · tier 1
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// Primitive: probe · in-process · tier 1
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//
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// [zh] 备份 / 回滚往返自检
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// 在容器里放一组已知内容的文件，打包成 ZIP，解到另一个目录，逐字节比对，再删掉。这条守的是「备份能不能真的回滚」——上一版写的是自造格式却叫 .tar，解不回来。
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//
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// [en] Backup and restore round-trip self-test
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// Places a set of known-content files in the container, packs them into a ZIP, extracts to another
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// directory, compares byte for byte, then removes them. This guards whether a backup can actually
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// be restored — the previous version wrote a homegrown format under a .tar name and could not be
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// read back.
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// ── 判别 / oracle ──
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// 同时验证解包时 ../ 与符号链接出不了目标目录。
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import Foundation
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// ── byte helpers — verbatim from Cinder27 Sources/Kit.swift ──
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enum B {
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static func be16(_ v: UInt16) -> [UInt8] { [UInt8(v >> 8 & 0xff), UInt8(v & 0xff)] }
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static func le16(_ v: UInt16) -> [UInt8] { [UInt8(v & 0xff), UInt8(v >> 8 & 0xff)] }
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static func be32(_ v: UInt32) -> [UInt8] {
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[UInt8(v >> 24 & 0xff), UInt8(v >> 16 & 0xff), UInt8(v >> 8 & 0xff), UInt8(v & 0xff)]
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}
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static func le32(_ v: UInt32) -> [UInt8] {
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[UInt8(v & 0xff), UInt8(v >> 8 & 0xff), UInt8(v >> 16 & 0xff), UInt8(v >> 24 & 0xff)]
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}
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static func be64(_ v: UInt64) -> [UInt8] {
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(0..<8).map { UInt8((v >> (56 - UInt64($0) * 8)) & 0xff) }
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}
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static func le64(_ v: UInt64) -> [UInt8] {
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(0..<8).map { UInt8((v >> (UInt64($0) * 8)) & 0xff) }
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}
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static func both16(_ v: UInt16) -> [UInt8] { le16(v) + be16(v) }
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static func both32(_ v: UInt32) -> [UInt8] { le32(v) + be32(v) }
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static func ascii(_ s: String) -> [UInt8] { Array(s.utf8) }
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}
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