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vace/wxapkg.php

Created Jul 18, 2017
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<?php
/* from : https://github.com/Clarence-pan/unpack-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 = $argv[1];
if (!is_file($packageFile)){
echo <<<HELP
Usage:
[php] {$argv[0]} <xxx.wxapkg>
- Unpack the `xxx.wxapkg` to `xxx.wxapkg.unpacked` directory.
HELP;
exit(1);
}
$targetDir = $packageFile . '.unpacked';
unpack_wxapkg($packageFile, $targetDir);
exit(0);
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