<?php
$str = file_get_contents(\'_-357038350_97.wxapkg.unpacked/app-service.js\');
$preg = \'/(data:image.*?)\"/\';
$len = strlen(\'data:image/png;base64,\');
if(preg_match_all($preg, $str, $arr)){
    foreach($arr[1] as $k => $img){
        file_put_contents(\'./images/\'.$k.\'.png\',base64_decode(substr($img,$len)));
        //echo substr($img,$len);exit;
    }
} else {
    echo \'no\';
}

$str = file_get_contents(\'_-357038350_97.wxapkg.unpacked/app-wxss.js\');
$preg = \'/\((data:image.*?)\)/\';
$len = strlen(\'data:image/png;base64,\');
if(preg_match_all($preg, $str, $arr)){
    foreach($arr[1] as $k => $img){
        file_put_contents(\'./images/a2_\'.$k.\'.png\',base64_decode(substr($img,$len)));
        //echo substr($img,$len);exit;
    }
} else {
    echo \'no\';
}

<?php
/**
源文件目录
    /data/data/com.tencent.mm/MicroMsg/{{一串32位的16进制字符串文件夹}}/appbrand/pkg/
    /data/data/com.eg.android.AlipayGphone, 在files/nebulaInstallApps/目录下存储了所有加载过的小程序
 * [php] /path/to/unpack-wxapkg.php <xxx.wxapkg>
 * php unpak.php _1123949441_351.wxapkg
 */

function unpack_wxapkg($file, $targetDir)
{
    if (!is_dir($targetDir)){
        mkdir($targetDir);
    }

    echo "Reading file.\n";
    $file = file_get_contents($file);
    $ptr = 18;

    $headerStruct = new StructDef([
        \'mask1\' => \'ushort\',
        \'info1\' => \'ulong\',
        \'indexInfoLength\' => \'ulong\',
        \'bodyInfoLength\' => \'ushort\',
        \'mask2\' => \'ushort\',
        \'fileCount\' => \'ulong\',
    ]);

    echo "Parsing file header...\n";

    $header = $headerStruct->unpack($file);
//    print_r([\'header\' => $header]);

    $unpackULong = function () use (&$file, &$ptr) {
        $ret = unpack_ulong(substr($file, $ptr, 4));
        $ptr += 4;
        return $ret;
    };

    $unpackUShort = function () use (&$file, &$ptr) {
        $ret = unpack_ushort(substr($file, $ptr, 2));
        $ptr += 2;
        return $ret;
    };


    $unpackStr = function ($len) use (&$file, &$ptr) {
        $ret = substr($file, $ptr, $len);
        $ptr += $len;
        return $ret;
    };


    $fileCount = $header[\'fileCount\'];

    echo "Got $fileCount files.\n";

    $unpackedFiles = [];

    for ($i = 0; $i < $fileCount; $i++) {
        $nameLength = $unpackULong();
        $f = [
            \'nameLength\' => $nameLength,
            \'name\' => $unpackStr($nameLength),
            \'offset\' => $unpackULong(),
            \'size\' => $unpackULong(),
        ];

        echo "Unpacking file {$f[\'name\']} ({$f[\'size\']}bytes)...\n";

        $f[\'content\'] = substr($file, $f[\'offset\'], $f[\'size\']);
        $unpackedFiles[] = $f;

        $destFile = $targetDir . $f[\'name\'];
        $destDir = dirname($destFile);
        if (!is_dir($destDir)){
            mkdir($destDir, 0777, true);
        }

        file_put_contents($targetDir . $f[\'name\'], $f[\'content\']);
    }


//    print_r([\'unpackedFiles\' => $unpackedFiles]);



    echo "All done.\n";
}

function unpack_ulong($str)
{
    $x = unpack(\'N\', $str);
    return $x[1];
}

function unpack_ushort($str)
{
    $x = unpack(\'n\', $str);
    return $x[1];
}

class StructDef
{
    protected $def;
    protected $unpackFormat;

    public function __construct($def)
    {
        $this->def = $def;
        $this->unpackFormat = self::convertStructDefToUnpackFormat($def);
    }

    public function unpack($data)
    {
        return unpack($this->unpackFormat, $data);
    }

    protected static function convertStructDefToUnpackFormat($def)
    {
        $defTypeToUnpackType = [
            \'byte\' => \'C\',
            \'uchar\' => \'C\',
            \'u8\' => \'C\',
            \'ushort\' => \'n\',
            \'u16\' => \'n\',
            \'ulong\' => \'N\',
            \'u32\' => \'N\',
        ];

        $ret = [];
        foreach ($def as $key => $type) {
            $ret[] = $defTypeToUnpackType[$type] . $key;
        }

        return implode(\'/\', $ret);
    }
}

$packageFile = $argv[1];

//支持目录下文件批量解压
 if (is_dir($packageFile)){
    $handle = opendir($packageFile);
    if($handle){
        while(($fl = readdir($handle)) !== false){
            $temp = $packageFile.DIRECTORY_SEPARATOR.$fl;
            //如果不加  $fl!=\'.\' && $fl != \'..\'  则会造成把$dir的父级目录也读取出来
            if(is_file($temp)){
                if($fl!=\'.\' && $fl != \'..\'){
                    $targetDir = $temp . \'.unpacked\';
                    unpack_wxapkg($temp, $targetDir);
                }
            }
        }
    }  
}else if (is_file($packageFile)){
    $targetDir = $packageFile . \'.unpacked\';
    unpack_wxapkg($packageFile, $targetDir);
}else{
    echo <<<HELP
Usage:
    [php] {$argv[0]} <xxx.wxapkg>
    - Unpack the `xxx.wxapkg` to `xxx.wxapkg.unpacked` directory.
HELP;

    exit(1);
}

exit(0);