微信dat图片还原（PHP版）

wechat_dat_to_image.php

<?php
function DatToImage($datPath) {
    $b = file_get_contents($datPath);
    if ($b === false) {
        throw new Exception("Failed to read DAT file");
    }
    if (strlen($b) < 2) {
        throw new Exception("Image size error");
    }

    $j0 = ord($b[0]) ^ 0xFF;
    $j1 = ord($b[1]) ^ 0xD8;
    $g0 = ord($b[0]) ^ 0x47;
    $g1 = ord($b[1]) ^ 0x49;
    $p0 = ord($b[0]) ^ 0x89;
    $p1 = ord($b[1]) ^ 0x50;

    $v = 0;
    $ext = '';
    if ($j0 == $j1) {
        $v = $j0;
        $ext = 'jpg';
    } else if ($g0 == $g1) {
        $v = $g0;
        $ext = 'gif';
    } else if ($p0 == $p1) {
        $v = $p0;
        $ext = 'png';
    } else {
        throw new Exception("Unknown image format");
    }

    for ($i = 0; $i < strlen($b); $i++) {
        $b[$i] = chr(ord($b[$i]) ^ $v);
    }

    $imgPath = substr($datPath, 0, -strlen($ext)).$ext;
    if (file_put_contents($imgPath, $b) === false) {
        throw new Exception("Failed to write image file");
    }

    return $imgPath;
}

try {
    $datPath = 'f8bdeb8a1cc3586ec6e29ff883257c2f.dat';
    $imgPath = DatToImage($datPath);
    echo "Image successfully converted: ".$imgPath;
} catch (Exception $e) {
    echo "Error converting image: ".$e->getMessage();
}
?>