// iio.ktx2 · ImageIO · KTX2ReadPlugin · CVE-2026-112625
// 原语: 整数溢出 · 进程内 · tier 2
// Primitive: integer overflow · in-process · tier 2
//
// [zh] KTX2 维度/层级尺寸运算
// KTX/KTX2 的层级字节数与块数运算缺少 64 位 umull/umulh 保护，且既有检查所依据的量本身是错的（使用 channels 而非源 bpp）。27.2 增加 \"image
// dimensions overflow\" 与 \"expected %llu bytes\" 两道闸门。
//
// [en] KTX2 dimension and level size arithmetic
// KTX/KTX2 level byte counts and block counts lack 64-bit umull/umulh protection, and the existing
// check is keyed on the wrong quantity (channels rather than source bpp). iOS 27.2 adds "image dimensions
// overflow" and "expected %llu bytes" gates.
// ── 判别 / oracle ──
// 维度 0xFFFF×0xFFFF，层级索引声明 64 字节。
//  变体 iio.pvr: PVR 位深低于通道位和
//
// 种子构建器（python，可直接运行）: CVE-2026-112625/CVE-2026-112625.py
// runnable python seed builder: CVE-2026-112625/CVE-2026-112625.py

import Foundation

// ── byte helpers — verbatim from Cinder27 Sources/Kit.swift ──
enum B {
    static func be16(_ v: UInt16) -> [UInt8] { [UInt8(v >> 8 & 0xff), UInt8(v & 0xff)] }
    static func le16(_ v: UInt16) -> [UInt8] { [UInt8(v & 0xff), UInt8(v >> 8 & 0xff)] }
    static func be32(_ v: UInt32) -> [UInt8] {
        [UInt8(v >> 24 & 0xff), UInt8(v >> 16 & 0xff), UInt8(v >> 8 & 0xff), UInt8(v & 0xff)]
    }
    static func le32(_ v: UInt32) -> [UInt8] {
        [UInt8(v & 0xff), UInt8(v >> 8 & 0xff), UInt8(v >> 16 & 0xff), UInt8(v >> 24 & 0xff)]
    }
    static func be64(_ v: UInt64) -> [UInt8] {
        (0..<8).map { UInt8((v >> (56 - UInt64($0) * 8)) & 0xff) }
    }
    static func le64(_ v: UInt64) -> [UInt8] {
        (0..<8).map { UInt8((v >> (UInt64($0) * 8)) & 0xff) }
    }
    static func both16(_ v: UInt16) -> [UInt8] { le16(v) + be16(v) }
    static func both32(_ v: UInt32) -> [UInt8] { le32(v) + be32(v) }
    static func ascii(_ s: String) -> [UInt8] { Array(s.utf8) }
}

/*
// iio.pvr · ImageIO · PVRReadPlugin::initialize · CVE-2026-112625
// 原语: 整数溢出 · 进程内 · tier 3
// Primitive: integer overflow · in-process · tier 3
//
// [zh] PVR 位深低于通道位和
// 各通道位数之间的相互匹配检查早已存在，但缺少 bitsPerPixel 相对通道位和的下界比较。27.2 补入 \"_bitsPerPixel %d is too small for 4 channels
// of %d bits\"。
//
// [en] PVR bits-per-pixel below the channel bit sum
// The mutual consistency check between channel bit widths has always been present, but there is no
// lower bound comparing bitsPerPixel against the sum of channel bits. iOS 27.2 adds "_bitsPerPixel
// %d is too small for 4 channels of %d bits".
*/