php-src/ext/phar/shortarc.php

<?php
if (in_array('phar', stream_get_wrappers()) && class_exists('Phar', 0)) {
    Phar::interceptFileFuncs();
    include 'phar://' . __FILE__ . '/' . Extract_Phar::START;
    return;
}
class Extract_Phar
{
    static $tmp = array();
    static $origdir;
    const GZ = 0x1000;
    const BZ2 = 0x2000;
    const MASK = 0x3000;
    const START = 'index.php';
    static function go($D)
    {
        register_shutdown_function(array('Extract_Phar', '_removeTmpFiles'));
        $fp = fopen(__FILE__, 'rb');
        fseek($fp, $D);
        $L = unpack('V', fread($fp, 4));
        $m = '';
        do {
            $read = 8192;
            if ($L[1] - strlen($m) < 8192) {
                $read = $L[1] - strlen($m);
            }
            $last = fread($fp, $read);
            $m .= $last;
        } while (strlen($last) && strlen($m) < $L[1]);
        if (strlen($m) < $L[1]) {
            die('ERROR: manifest length read was "' . 
                strlen($m) .'" should be "' .
                $L[1] . '"');
        }
        $info = self::_unpack($m);
        $f = $info['c'];
        if ($f & self::GZ) {
            if (!function_exists('gzinflate')) {
                die('Error: zlib extension is not enabled - gzinflate() function needed' .
                    ' for compressed .phars');
            }
        }
        if ($f & self::BZ2) {
            if (!function_exists('bzdecompress')) {
                die('Error: bzip2 extension is not enabled - bzdecompress() function needed' .
                    ' for compressed .phars');
            }
        }
        $temp = self::tmpdir();
        if (!$temp) {
            $sessionpath = session_save_path();
            if (strpos ($sessionpath, ";") !== FALSE)
                $sessionpath = substr ($sessionpath, strpos ($sessionpath, ";")+1);
            if (!file_exists($sessionpath) && !is_dir($sessionpath)) {
                die('Could not locate temporary directory to extract phar');
            }
            $temp = $sessionpath;
        }
        $temp .= '/pharextract';
        if (!file_exists($temp)) {
            @mkdir($temp);
            $temp = realpath($temp);
            self::$tmp[] = $temp;
        }
        self::$origdir = getcwd();
        foreach ($info['m'] as $path => $file) {
            $a = !file_exists(dirname($temp . '/' . $path));
            @mkdir(dirname($temp . '/' . $path), 0777, true);
            clearstatcache();
            if ($a) self::$tmp[] = realpath(dirname($temp . '/' . $path));
            if ($path[strlen($path) - 1] == '/') {
                mkdir($temp . '/' . $path);
            } else {
                file_put_contents($temp . '/' . $path, self::extractFile($path, $file, $fp));
            }
            self::$tmp[] = realpath($temp . '/' . $path);
        }
        chdir($temp);
        include self::START;
    }

    static function tmpdir()
    {
        if (strpos(PHP_OS, 'WIN') !== false) {
            if ($var = isset($_ENV['TMP']) ? $_ENV['TMP'] : getenv('TMP')) {
                return $var;
            }
            if ($var = isset($_ENV['TEMP']) ? $_ENV['TEMP'] : getenv('TEMP')) {
                return $var;
            }
            if ($var = isset($_ENV['USERPROFILE']) ? $_ENV['USERPROFILE'] : @getenv('USERPROFILE')) {
                return $var;
            }
            if ($var = isset($_ENV['windir']) ? $_ENV['windir'] : getenv('windir')) {
                return $var;
            }
            return @getenv('SystemRoot') . '\temp';
        }
        if ($var = isset($_ENV['TMPDIR']) ? $_ENV['TMPDIR'] : getenv('TMPDIR')) {
            return $var;
        }
        return realpath('/tmp');
    }

    static function _unpack($m)
    {
        $info = unpack('V', substr($m, 0, 4));
        // skip API version, phar flags, alias, metadata
        $l = unpack('V', substr($m, 10, 4));
        $m = substr($m, 14 + $l[1]);
        $s = unpack('V', substr($m, 0, 4));
        $o = 0;
        $start = 4 + $s[1];
        $ret['c'] = 0;
        for ($i = 0; $i < $info[1]; $i++) {
            // length of the file name
            $len = unpack('V', substr($m, $start, 4));
            $start += 4;
            // file name
            $savepath = substr($m, $start, $len[1]);
            $start += $len[1];
            // retrieve manifest data:
            // 0 = size, 1 = timestamp, 2 = compressed size, 3 = crc32, 4 = flags
            // 5 = metadata length
            $ret['m'][$savepath] = array_values(unpack('Va/Vb/Vc/Vd/Ve/Vf', substr($m, $start, 24)));
            $ret['m'][$savepath][3] = sprintf('%u', $ret['m'][$savepath][3]
                & 0xffffffff);
            $ret['m'][$savepath][7] = $o;
            $o += $ret['m'][$savepath][2];
            $start += 24 + $ret['m'][$savepath][5];
            $ret['c'] |= $ret['m'][$savepath][4] & self::MASK;
        }
        return $ret;
    }

    static function extractFile($path, $entry, $fp)
    {
        $data = '';
        $c = $entry[2];
        while ($c) {
            if ($c < 8192) {
                $data .= @fread($fp, $c);
                $c = 0;
            } else {
                $c -= 8192;
                $data .= @fread($fp, 8192);
            }
        }
        if ($entry[4] & self::GZ) {
            $data = gzinflate($data);
        } elseif ($entry[4] & self::BZ2) {
            $data = bzdecompress($data);
        }
        if (strlen($data) != $entry[0]) {
            die("Not valid internal .phar file (size error " . strlen($data) . " != " .
                $stat[7] . ")");
        }
        if ($entry[3] != sprintf("%u", crc32($data) & 0xffffffff)) {
            die("Not valid internal .phar file (checksum error)");
        }
        return $data;
    }

    static function _removeTmpFiles()
    {
        // for removal of temp files
        usort(self::$tmp, 'strnatcasecmp');
        array_reverse(self::$tmp, 1);
        if (count(self::$tmp)) {
            foreach (self::$tmp as $f) {
                if (file_exists($f)) is_dir($f) ? @rmdir($f) : @unlink($f);
            }
            
        }
        chdir(self::$origdir);
    }
}