<?php

define('ARCHIVE_TAR_ATT_SEPARATOR', 90001);
define('ARCHIVE_TAR_END_BLOCK', pack('a512', ''));

class Archive_Tar extends PEAR {

    var $_tarname = '';
    var $_compress = false;
    var $_compress_type = 'none';
    var $_separator = ' ';
    var $_file = 0;
    var $_temp_tarname = '';

    function Archive_Tar($p_tarname, $p_compress = null) {
        $this->PEAR();
        $this->_compress = false;
        $this->_compress_type = 'none';
        if (($p_compress === null) || ($p_compress == '')) {
            if (file_exists($p_tarname)) {
                if ($fp = @fopen($p_tarname, "rb")) {
                    $data = fread($fp, 2);
                    fclose($fp);
                    if ($data == "\37\213") {
                        $this->_compress = true;
                        $this->_compress_type = 'gz';
                    } elseif ($data == "BZ") {
                        $this->_compress = true;
                        $this->_compress_type = 'bz2';
                    }
                }
            } else {
                if (substr($p_tarname, -2) == 'gz') {
                    $this->_compress = true;
                    $this->_compress_type = 'gz';
                } elseif ((substr($p_tarname, -3) == 'bz2') ||
                        (substr($p_tarname, -2) == 'bz')) {
                    $this->_compress = true;
                    $this->_compress_type = 'bz2';
                }
            }
        } else {
            if (($p_compress === true) || ($p_compress == 'gz')) {
                $this->_compress = true;
                $this->_compress_type = 'gz';
            } else if ($p_compress == 'bz2') {
                $this->_compress = true;
                $this->_compress_type = 'bz2';
            } else {
                die("Unsupported compression type '$p_compress'\n" .
                        "Supported types are 'gz' and 'bz2'.\n");
                return false;
            }
        }
        $this->_tarname = $p_tarname;
        if ($this->_compress) {
            if ($this->_compress_type == 'gz') {
                $extname = 'zlib';
            } else if ($this->_compress_type == 'bz2') {
                $extname = 'bz2';
            }
            if (!extension_loaded($extname)) {
                PEAR::loadExtension($extname);
            }
            if (!extension_loaded($extname)) {
                die("The extension '$extname' couldn't be found.\n" .
                        "Please make sure your version of PHP was built " .
                        "with '$extname' support.\n");
                return false;
            }
        }
    }

    function _Archive_Tar() {
        $this->_close();
        if ($this->_temp_tarname != '') {
            @unlink($this->_temp_tarname);
        }
        $this->_PEAR();
    }

    function create($p_filelist) {
        return $this->createModify($p_filelist, '', '');
    }

    function add($p_filelist) {
        return $this->addModify($p_filelist, '', '');
    }

    function extract($p_path = '') {
        return $this->extractModify($p_path, '');
    }

    function listContent() {
        $v_list_detail = array();
        if ($this->_openRead()) {
            if (!$this->_extractList('', $v_list_detail, "list", '', '')) {
                unset($v_list_detail);
                $v_list_detail = 0;
            }
            $this->_close();
        }
        return $v_list_detail;
    }

    function createModify($p_filelist, $p_add_dir, $p_remove_dir = '') {
        $v_result = true;
        if (!$this->_openWrite()) {
            return false;
        }
        if ($p_filelist != '') {
            if (is_array($p_filelist)) {
                $v_list = $p_filelist;
            } elseif (is_string($p_filelist))
                $v_list = explode($this->_separator, $p_filelist);
            else {
                $this->_cleanFile();
                $this->_error('Invalid file list');
                return false;
            }
            $v_result = $this->_addList($v_list, $p_add_dir, $p_remove_dir);
        }
        if ($v_result) {
            $this->_writeFooter();
            $this->_close();
        } else {
            $this->_cleanFile();
        }
        return $v_result;
    }

    function addModify($p_filelist, $p_add_dir, $p_remove_dir = '') {
        $v_result = true;
        if (!$this->_isArchive()) {
            $v_result = $this->createModify($p_filelist, $p_add_dir, $p_remove_dir);
        } else {
            if (is_array($p_filelist))
                $v_list = $p_filelist;
            elseif (is_string($p_filelist))
                $v_list = explode($this->_separator, $p_filelist);
            else {
                $this->_error('Invalid file list');
                return false;
            }
            $v_result = $this->_append($v_list, $p_add_dir, $p_remove_dir);
        }
        return $v_result;
    }

    function addString($p_filename, $p_string) {
        $v_result = true;
        if (!$this->_isArchive()) {
            if (!$this->_openWrite()) {
                return false;
            }
            $this->_close();
        }
        if (!$this->_openAppend()) {
            return false;
        }
        $v_result = $this->_addString($p_filename, $p_string);
        $this->_writeFooter();
        $this->_close();
        return $v_result;
    }

    function extractModify($p_path, $p_remove_path) {
        $v_result = true;
        $v_list_detail = array();
        if ($v_result = $this->_openRead()) {
            $v_result = $this->_extractList($p_path, $v_list_detail, "complete", 0, $p_remove_path);
            $this->_close();
        }
        return $v_result;
    }

    function extractInString($p_filename) {
        if ($this->_openRead()) {
            $v_result = $this->_extractInString($p_filename);
            $this->_close();
        } else {
            $v_result = NULL;
        }
        return $v_result;
    }

    function extractList($p_filelist, $p_path = '', $p_remove_path = '') {
        $v_result = true;
        $v_list_detail = array();
        if (is_array($p_filelist)) {
            $v_list = $p_filelist;
        } elseif (is_string($p_filelist))
            $v_list = explode($this->_separator, $p_filelist);
        else {
            $this->_error('Invalid string list');
            return false;
        }
        if ($v_result = $this->_openRead()) {
            $v_result = $this->_extractList($p_path, $v_list_detail, "partial", $v_list, $p_remove_path);
            $this->_close();
        }
        return $v_result;
    }

    function setAttribute() {
        $v_result = true;
        if (($v_size = func_num_args()) == 0) {
            return true;
        }
        $v_att_list = &func_get_args();
        $i = 0;
        while ($i < $v_size) {
            switch ($v_att_list[$i]) {
                case ARCHIVE_TAR_ATT_SEPARATOR :
                    if (($i + 1) >= $v_size) {
                        $this->_error('Invalid number of parameters for '
                                . 'attribute ARCHIVE_TAR_ATT_SEPARATOR');
                        return false;
                    }
                    $this->_separator = $v_att_list[$i + 1];
                    $i++;
                    break;
                default :
                    $this->_error('Unknow attribute code ' . $v_att_list[$i] . '');
                    return false;
            }
            $i++;
        }
        return $v_result;
    }

    function _error($p_message) {
        $this->raiseError($p_message);
    }

    function _warning($p_message) {
        $this->raiseError($p_message);
    }

    function _isArchive($p_filename = NULL) {
        if ($p_filename == NULL) {
            $p_filename = $this->_tarname;
        }
        clearstatcache();
        return is_file($p_filename);
    }

    function _openWrite() {
        if ($this->_compress_type == 'gz') {
            $this->_file = gzopen($this->_tarname, "wb9");
        } else if ($this->_compress_type == 'bz2') {
            $this->_file = bzopen($this->_tarname, "wb");
        } else if ($this->_compress_type == 'none') {
            $this->_file = @fopen($this->_tarname, "wb");
        } else {
            $this->_error('Unknown or missing compression type ('
                    . $this->_compress_type . ')');
        }
        if ($this->_file == 0) {
            $this->_error('Unable to open in write mode \''
                    . $this->_tarname . '\'');
            return false;
        }
        return true;
    }

    function _openRead() {
        if (strtolower(substr($this->_tarname, 0, 7)) == 'http://') {
            if ($this->_temp_tarname == '') {
                $this->_temp_tarname = uniqid('tar') . '.tmp';
                if (!$v_file_from = @fopen($this->_tarname, 'rb')) {
                    $this->_error('Unable to open in read mode \''
                            . $this->_tarname . '\'');
                    $this->_temp_tarname = '';
                    return false;
                }
                if (!$v_file_to = @fopen($this->_temp_tarname, 'wb')) {
                    $this->_error('Unable to open in write mode \''
                            . $this->_temp_tarname . '\'');
                    $this->_temp_tarname = '';
                    return false;
                }
                while ($v_data = fread($v_file_from, 1024)) {
                    fwrite($v_file_to, $v_data);
                }
                fclose($v_file_from);
                fclose($v_file_to);
            }
            $v_filename = $this->_temp_tarname;
        } else {
            $v_filename = $this->_tarname;
        }
        if ($this->_compress_type == 'gz') {
            $this->_file = gzopen($v_filename, "rb");
        } else if ($this->_compress_type == 'bz2') {
            $this->_file = bzopen($v_filename, "rb");
        } else if ($this->_compress_type == 'none') {
            $this->_file = @fopen($v_filename, "rb");
        } else {
            $this->_error('Unknown or missing compression type ('
                    . $this->_compress_type . ')');
        }
        if ($this->_file == 0) {
            $this->_error('Unable to open in read mode \'' . $v_filename . '\'');
            return false;
        }
        return true;
    }

    function _openReadWrite() {
        if ($this->_compress_type == 'gz') {
            $this->_file = gzopen($this->_tarname, "r+b");
        } else if ($this->_compress_type == 'bz2') {
            $this->_file = bzopen($this->_tarname, "r+b");
        } else if ($this->_compress_type == 'none') {
            $this->_file = @fopen($this->_tarname, "r+b");
        } else {
            $this->_error('Unknown or missing compression type ('
                    . $this->_compress_type . ')');
        }
        if ($this->_file == 0) {
            $this->_error('Unable to open in read/write mode \''
                    . $this->_tarname . '\'');
            return false;
        }
        return true;
    }

    function _close() {
        if (is_resource($this->_file)) {
            if ($this->_compress_type == 'gz') {
                gzclose($this->_file);
            } else if ($this->_compress_type == 'bz2') {
                bzclose($this->_file);
            } else if ($this->_compress_type == 'none') {
                fclose($this->_file);
            } else {
                $this->_error('Unknown or missing compression type ('
                        . $this->_compress_type . ')');
            }
            $this->_file = 0;
        }
        if ($this->_temp_tarname != '') {
            @unlink($this->_temp_tarname);
            $this->_temp_tarname = '';
        }
        return true;
    }

    function _cleanFile() {
        $this->_close();
        if ($this->_temp_tarname != '') {
            @unlink($this->_temp_tarname);
            $this->_temp_tarname = '';
        } else {
            @unlink($this->_tarname);
        }
        $this->_tarname = '';
        return true;
    }

    function _writeBlock($p_binary_data, $p_len = null) {
        if (is_resource($this->_file)) {
            if ($p_len === null) {
                if ($this->_compress_type == 'gz')
                    @gzputs($this->_file, $p_binary_data);
                else if ($this->_compress_type == 'bz2')
                    @bzwrite($this->_file, $p_binary_data);
                else if ($this->_compress_type == 'none')
                    @fputs($this->_file, $p_binary_data);
                else
                    $this->_error('Unknown or missing compression type ('
                            . $this->_compress_type . ')');
            } else {
                if ($this->_compress_type == 'gz')
                    @gzputs($this->_file, $p_binary_data, $p_len);
                else if ($this->_compress_type == 'bz2')
                    @bzwrite($this->_file, $p_binary_data, $p_len);
                else if ($this->_compress_type == 'none')
                    @fputs($this->_file, $p_binary_data, $p_len);
                else
                    $this->_error('Unknown or missing compression type ('
                            . $this->_compress_type . ')');
            }
        }
        return true;
    }

    function _readBlock() {
        $v_block = null;
        if (is_resource($this->_file)) {
            if ($this->_compress_type == 'gz')
                $v_block = @gzread($this->_file, 512);
            else if ($this->_compress_type == 'bz2')
                $v_block = @bzread($this->_file, 512);
            else if ($this->_compress_type == 'none')
                $v_block = @fread($this->_file, 512);
            else
                $this->_error('Unknown or missing compression type ('
                        . $this->_compress_type . ')');
        }
        return $v_block;
    }

    function _jumpBlock($p_len = null) {
        if (is_resource($this->_file)) {
            if ($p_len === null)
                $p_len = 1;
            if ($this->_compress_type == 'gz') {
                @gzseek($this->_file, gztell($this->_file) + ($p_len * 512));
            } else if ($this->_compress_type == 'bz2') {
                for ($i = 0; $i < $p_len; $i++)
                    $this->_readBlock();
            } else if ($this->_compress_type == 'none')
                @fseek($this->_file, ftell($this->_file) + ($p_len * 512));
            else
                $this->_error('Unknown or missing compression type ('
                        . $this->_compress_type . ')');
        }
        return true;
    }

    function _writeFooter() {
        if (is_resource($this->_file)) {
            $v_binary_data = pack('a1024', '');
            $this->_writeBlock($v_binary_data);
        }
        return true;
    }

    function _addList($p_list, $p_add_dir, $p_remove_dir) {
        $v_result = true;
        $v_header = array();
        $p_add_dir = $this->_translateWinPath($p_add_dir);
        $p_remove_dir = $this->_translateWinPath($p_remove_dir, false);
        if (!$this->_file) {
            $this->_error('Invalid file descriptor');
            return false;
        }
        if (sizeof($p_list) == 0)
            return true;
        foreach ($p_list as $v_filename) {
            if (!$v_result) {
                break;
            }
            if ($v_filename == $this->_tarname)
                continue;
            if ($v_filename == '')
                continue;
            if (!file_exists($v_filename)) {
                $this->_warning("File '$v_filename' does not exist");
                continue;
            }
            if (!$this->_addFile($v_filename, $v_header, $p_add_dir, $p_remove_dir))
                return false;
            if (@is_dir($v_filename)) {
                if (!($p_hdir = opendir($v_filename))) {
                    $this->_warning("Directory '$v_filename' can not be read");
                    continue;
                }
                while (false !== ($p_hitem = readdir($p_hdir))) {
                    if (($p_hitem != '.') && ($p_hitem != '..')) {
                        if ($v_filename != ".")
                            $p_temp_list[0] = $v_filename . '/' . $p_hitem;
                        else
                            $p_temp_list[0] = $p_hitem;
                        $v_result = $this->_addList($p_temp_list, $p_add_dir, $p_remove_dir);
                    }
                }
                unset($p_temp_list);
                unset($p_hdir);
                unset($p_hitem);
            }
        }
        return $v_result;
    }

    function _addFile($p_filename, &$p_header, $p_add_dir, $p_remove_dir) {
        if (!$this->_file) {
            $this->_error('Invalid file descriptor');
            return false;
        }
        if ($p_filename == '') {
            $this->_error('Invalid file name');
            return false;
        }
        $p_filename = $this->_translateWinPath($p_filename, false);
        ;
        $v_stored_filename = $p_filename;
        if (strcmp($p_filename, $p_remove_dir) == 0) {
            return true;
        }
        if ($p_remove_dir != '') {
            if (substr($p_remove_dir, -1) != '/')
                $p_remove_dir .= '/';
            if (substr($p_filename, 0, strlen($p_remove_dir)) == $p_remove_dir)
                $v_stored_filename = substr($p_filename, strlen($p_remove_dir));
        }
        $v_stored_filename = $this->_translateWinPath($v_stored_filename);
        if ($p_add_dir != '') {
            if (substr($p_add_dir, -1) == '/')
                $v_stored_filename = $p_add_dir . $v_stored_filename;
            else
                $v_stored_filename = $p_add_dir . '/' . $v_stored_filename;
        }
        $v_stored_filename = $this->_pathReduction($v_stored_filename);
        if ($this->_isArchive($p_filename)) {
            if (($v_file = @fopen($p_filename, "rb")) == 0) {
                $this->_warning("Unable to open file '" . $p_filename
                        . "' in binary read mode");
                return true;
            }
            if (!$this->_writeHeader($p_filename, $v_stored_filename))
                return false;
            while (($v_buffer = fread($v_file, 512)) != '') {
                $v_binary_data = pack("a512", "$v_buffer");
                $this->_writeBlock($v_binary_data);
            }
            fclose($v_file);
        } else {
            if (!$this->_writeHeader($p_filename, $v_stored_filename))
                return false;
        }
        return true;
    }

    function _addString($p_filename, $p_string) {
        if (!$this->_file) {
            $this->_error('Invalid file descriptor');
            return false;
        }
        if ($p_filename == '') {
            $this->_error('Invalid file name');
            return false;
        }
        $p_filename = $this->_translateWinPath($p_filename, false);
        ;
        if (!$this->_writeHeaderBlock($p_filename, strlen($p_string), time(), 384, "", 0, 0))
            return false;
        $i = 0;
        while (($v_buffer = substr($p_string, (($i++) * 512), 512)) != '') {
            $v_binary_data = pack("a512", $v_buffer);
            $this->_writeBlock($v_binary_data);
        }
        return true;
    }

    function _writeHeader($p_filename, $p_stored_filename) {
        if ($p_stored_filename == '')
            $p_stored_filename = $p_filename;
        $v_reduce_filename = $this->_pathReduction($p_stored_filename);
        if (strlen($v_reduce_filename) > 99) {
            if (!$this->_writeLongHeader($v_reduce_filename))
                return false;
        }
        $v_info = stat($p_filename);
        $v_uid = sprintf("%6s ", DecOct($v_info[4]));
        $v_gid = sprintf("%6s ", DecOct($v_info[5]));
        $v_perms = sprintf("%6s ", DecOct(fileperms($p_filename)));
        $v_mtime = sprintf("%11s", DecOct(filemtime($p_filename)));
        if (@is_dir($p_filename)) {
            $v_typeflag = "5";
            $v_size = sprintf("%11s ", DecOct(0));
        } else {
            $v_typeflag = '';
            clearstatcache();
            $v_size = sprintf("%11s ", DecOct(filesize($p_filename)));
        }
        $v_linkname = '';
        $v_magic = '';
        $v_version = '';
        $v_uname = '';
        $v_gname = '';
        $v_devmajor = '';
        $v_devminor = '';
        $v_prefix = '';
        $v_binary_data_first = pack("a100a8a8a8a12A12", $v_reduce_filename, $v_perms, $v_uid, $v_gid, $v_size, $v_mtime);
        $v_binary_data_last = pack("a1a100a6a2a32a32a8a8a155a12", $v_typeflag, $v_linkname, $v_magic, $v_version, $v_uname, $v_gname, $v_devmajor, $v_devminor, $v_prefix, '');
        $v_checksum = 0;
        for ($i = 0; $i < 148; $i++)
            $v_checksum += ord(substr($v_binary_data_first, $i, 1));
        for ($i = 148; $i < 156; $i++)
            $v_checksum += ord(' ');
        for ($i = 156, $j = 0; $i < 512; $i++, $j++)
            $v_checksum += ord(substr($v_binary_data_last, $j, 1));
        $this->_writeBlock($v_binary_data_first, 148);
        $v_checksum = sprintf("%6s ", DecOct($v_checksum));
        $v_binary_data = pack("a8", $v_checksum);
        $this->_writeBlock($v_binary_data, 8);
        $this->_writeBlock($v_binary_data_last, 356);
        return true;
    }

    function _writeHeaderBlock($p_filename, $p_size, $p_mtime = 0, $p_perms = 0, $p_type = '', $p_uid = 0, $p_gid = 0) {
        $p_filename = $this->_pathReduction($p_filename);
        if (strlen($p_filename) > 99) {
            if (!$this->_writeLongHeader($p_filename))
                return false;
        }
        if ($p_type == "5") {
            $v_size = sprintf("%11s ", DecOct(0));
        } else {
            $v_size = sprintf("%11s ", DecOct($p_size));
        }
        $v_uid = sprintf("%6s ", DecOct($p_uid));
        $v_gid = sprintf("%6s ", DecOct($p_gid));
        $v_perms = sprintf("%6s ", DecOct($p_perms));
        $v_mtime = sprintf("%11s", DecOct($p_mtime));
        $v_linkname = '';
        $v_magic = '';
        $v_version = '';
        $v_uname = '';
        $v_gname = '';
        $v_devmajor = '';
        $v_devminor = '';
        $v_prefix = '';
        $v_binary_data_first = pack("a100a8a8a8a12A12", $p_filename, $v_perms, $v_uid, $v_gid, $v_size, $v_mtime);
        $v_binary_data_last = pack("a1a100a6a2a32a32a8a8a155a12", $p_type, $v_linkname, $v_magic, $v_version, $v_uname, $v_gname, $v_devmajor, $v_devminor, $v_prefix, '');
        $v_checksum = 0;
        for ($i = 0; $i < 148; $i++)
            $v_checksum += ord(substr($v_binary_data_first, $i, 1));
        for ($i = 148; $i < 156; $i++)
            $v_checksum += ord(' ');
        for ($i = 156, $j = 0; $i < 512; $i++, $j++)
            $v_checksum += ord(substr($v_binary_data_last, $j, 1));
        $this->_writeBlock($v_binary_data_first, 148);
        $v_checksum = sprintf("%6s ", DecOct($v_checksum));
        $v_binary_data = pack("a8", $v_checksum);
        $this->_writeBlock($v_binary_data, 8);
        $this->_writeBlock($v_binary_data_last, 356);
        return true;
    }

    function _writeLongHeader($p_filename) {
        $v_size = sprintf("%11s ", DecOct(strlen($p_filename)));
        $v_typeflag = 'L';
        $v_linkname = '';
        $v_magic = '';
        $v_version = '';
        $v_uname = '';
        $v_gname = '';
        $v_devmajor = '';
        $v_devminor = '';
        $v_prefix = '';
        $v_binary_data_first = pack("a100a8a8a8a12A12", '././@LongLink', 0, 0, 0, $v_size, 0);
        $v_binary_data_last = pack("a1a100a6a2a32a32a8a8a155a12", $v_typeflag, $v_linkname, $v_magic, $v_version, $v_uname, $v_gname, $v_devmajor, $v_devminor, $v_prefix, '');
        $v_checksum = 0;
        for ($i = 0; $i < 148; $i++)
            $v_checksum += ord(substr($v_binary_data_first, $i, 1));
        for ($i = 148; $i < 156; $i++)
            $v_checksum += ord(' ');
        for ($i = 156, $j = 0; $i < 512; $i++, $j++)
            $v_checksum += ord(substr($v_binary_data_last, $j, 1));
        $this->_writeBlock($v_binary_data_first, 148);
        $v_checksum = sprintf("%6s ", DecOct($v_checksum));
        $v_binary_data = pack("a8", $v_checksum);
        $this->_writeBlock($v_binary_data, 8);
        $this->_writeBlock($v_binary_data_last, 356);
        $i = 0;
        while (($v_buffer = substr($p_filename, (($i++) * 512), 512)) != '') {
            $v_binary_data = pack("a512", "$v_buffer");
            $this->_writeBlock($v_binary_data);
        }
        return true;
    }

    function _readHeader($v_binary_data, &$v_header) {
        if (strlen($v_binary_data) == 0) {
            $v_header['filename'] = '';
            return true;
        }
        if (strlen($v_binary_data) != 512) {
            $v_header['filename'] = '';
            $this->_error('Invalid block size : ' . strlen($v_binary_data));
            return false;
        }
        if (!is_array($v_header)) {
            $v_header = array();
        }
        $v_checksum = 0;
        for ($i = 0; $i < 148; $i++)
            $v_checksum+=ord(substr($v_binary_data, $i, 1));
        for ($i = 148; $i < 156; $i++)
            $v_checksum += ord(' ');
        for ($i = 156; $i < 512; $i++)
            $v_checksum+=ord(substr($v_binary_data, $i, 1));
        $v_data = unpack("a100filename/a8mode/a8uid/a8gid/a12size/a12mtime/"
                . "a8checksum/a1typeflag/a100link/a6magic/a2version/"
                . "a32uname/a32gname/a8devmajor/a8devminor", $v_binary_data);
        $v_header['checksum'] = OctDec(trim($v_data['checksum']));
        if ($v_header['checksum'] != $v_checksum) {
            $v_header['filename'] = '';
            if (($v_checksum == 256) && ($v_header['checksum'] == 0))
                return true;
            $this->_error('Invalid checksum for file "' . $v_data['filename']
                    . '" : ' . $v_checksum . ' calculated, '
                    . $v_header['checksum'] . ' expected');
            return false;
        }
        $v_header['filename'] = trim($v_data['filename']);
        if ($this->_maliciousFilename($v_header['filename'])) {
            $this->_error('Malicious .tar detected, file "' . $v_header['filename'] .
                    '" will not install in desired directory tree');
            return false;
        }
        $v_header['mode'] = OctDec(trim($v_data['mode']));
        $v_header['uid'] = OctDec(trim($v_data['uid']));
        $v_header['gid'] = OctDec(trim($v_data['gid']));
        $v_header['size'] = OctDec(trim($v_data['size']));
        $v_header['mtime'] = OctDec(trim($v_data['mtime']));
        if (($v_header['typeflag'] = $v_data['typeflag']) == "5") {
            $v_header['size'] = 0;
        }
        $v_header['link'] = trim($v_data['link']);
        return true;
    }

    function _maliciousFilename($file) {
        if (strpos($file, '/../') !== false) {
            return true;
        }
        if (strpos($file, '../') === 0) {
            return true;
        }
        return false;
    }

    function _readLongHeader(&$v_header) {
        $v_filename = '';
        $n = floor($v_header['size'] / 512);
        for ($i = 0; $i < $n; $i++) {
            $v_content = $this->_readBlock();
            $v_filename .= $v_content;
        }
        if (($v_header['size'] % 512) != 0) {
            $v_content = $this->_readBlock();
            $v_filename .= $v_content;
        }
        $v_binary_data = $this->_readBlock();
        if (!$this->_readHeader($v_binary_data, $v_header))
            return false;
        $v_header['filename'] = $v_filename;
        if ($this->_maliciousFilename($v_filename)) {
            $this->_error('Malicious .tar detected, file "' . $v_filename .
                    '" will not install in desired directory tree');
            return false;
        }
        return true;
    }

    function _extractInString($p_filename) {
        $v_result_str = "";
        While (strlen($v_binary_data = $this->_readBlock()) != 0) {
            if (!$this->_readHeader($v_binary_data, $v_header))
                return NULL;
            if ($v_header['filename'] == '')
                continue;
            if ($v_header['typeflag'] == 'L') {
                if (!$this->_readLongHeader($v_header))
                    return NULL;
            }
            if ($v_header['filename'] == $p_filename) {
                if ($v_header['typeflag'] == "5") {
                    $this->_error('Unable to extract in string a directory '
                            . 'entry {' . $v_header['filename'] . '}');
                    return NULL;
                } else {
                    $n = floor($v_header['size'] / 512);
                    for ($i = 0; $i < $n; $i++) {
                        $v_result_str .= $this->_readBlock();
                    }
                    if (($v_header['size'] % 512) != 0) {
                        $v_content = $this->_readBlock();
                        $v_result_str .= substr($v_content, 0, ($v_header['size'] % 512));
                    }
                    return $v_result_str;
                }
            } else {
                $this->_jumpBlock(ceil(($v_header['size'] / 512)));
            }
        }
        return NULL;
    }

    function _extractList($p_path, &$p_list_detail, $p_mode, $p_file_list, $p_remove_path) {
        $v_result = true;
        $v_nb = 0;
        $v_extract_all = true;
        $v_listing = false;
        $p_path = $this->_translateWinPath($p_path, false);
        if ($p_path == '' || (substr($p_path, 0, 1) != '/' && substr($p_path, 0, 3) != "../" && !strpos($p_path, ':'))) {
            $p_path = "./" . $p_path;
        }
        $p_remove_path = $this->_translateWinPath($p_remove_path);
        if (($p_remove_path != '') && (substr($p_remove_path, -1) != '/'))
            $p_remove_path .= '/';
        $p_remove_path_size = strlen($p_remove_path);
        switch ($p_mode) {
            case "complete" :
                $v_extract_all = TRUE;
                $v_listing = FALSE;
                break;
            case "partial" :
                $v_extract_all = FALSE;
                $v_listing = FALSE;
                break;
            case "list" :
                $v_extract_all = FALSE;
                $v_listing = TRUE;
                break;
            default :
                $this->_error('Invalid extract mode (' . $p_mode . ')');
                return false;
        }
        clearstatcache();
        while (strlen($v_binary_data = $this->_readBlock()) != 0) {
            $v_extract_file = FALSE;
            $v_extraction_stopped = 0;
            if (!$this->_readHeader($v_binary_data, $v_header))
                return false;
            if ($v_header['filename'] == '') {
                continue;
            }
            if ($v_header['typeflag'] == 'L') {
                if (!$this->_readLongHeader($v_header))
                    return false;
            }
            if ((!$v_extract_all) && (is_array($p_file_list))) {
                $v_extract_file = false;
                for ($i = 0; $i < sizeof($p_file_list); $i++) {
                    if (substr($p_file_list[$i], -1) == '/') {
                        if ((strlen($v_header['filename']) > strlen($p_file_list[$i])) && (substr($v_header['filename'], 0, strlen($p_file_list[$i])) == $p_file_list[$i])) {
                            $v_extract_file = TRUE;
                            break;
                        }
                    } elseif ($p_file_list[$i] == $v_header['filename']) {
                        $v_extract_file = TRUE;
                        break;
                    }
                }
            } else {
                $v_extract_file = TRUE;
            }
            if (($v_extract_file) && (!$v_listing)) {
                if (($p_remove_path != '') && (substr($v_header['filename'], 0, $p_remove_path_size) == $p_remove_path))
                    $v_header['filename'] = substr($v_header['filename'], $p_remove_path_size);
                if (($p_path != './') && ($p_path != '/')) {
                    while (substr($p_path, -1) == '/')
                        $p_path = substr($p_path, 0, strlen($p_path) - 1);
                    if (substr($v_header['filename'], 0, 1) == '/')
                        $v_header['filename'] = $p_path . $v_header['filename'];
                    else
                        $v_header['filename'] = $p_path . '/' . $v_header['filename'];
                }
                if (file_exists($v_header['filename'])) {
                    if ((@is_dir($v_header['filename'])) && ($v_header['typeflag'] == '')) {
                        $this->_error('File ' . $v_header['filename']
                                . ' already exists as a directory');
                        return false;
                    }
                    if (($this->_isArchive($v_header['filename'])) && ($v_header['typeflag'] == "5")) {
                        $this->_error('Directory ' . $v_header['filename']
                                . ' already exists as a file');
                        return false;
                    }
                    if (!is_writeable($v_header['filename'])) {
                        $this->_error('File ' . $v_header['filename']
                                . ' already exists and is write protected');
                        return false;
                    }
                    if (filemtime($v_header['filename']) > $v_header['mtime']) {
                        
                    }
                } elseif (($v_result = $this->_dirCheck(($v_header['typeflag'] == "5" ? $v_header['filename'] : dirname($v_header['filename'])))) != 1) {
                    $this->_error('Unable to create path for ' . $v_header['filename']);
                    return false;
                }
                if ($v_extract_file) {
                    if ($v_header['typeflag'] == "5") {
                        if (!@file_exists($v_header['filename'])) {
                            if (!@mkdir($v_header['filename'], 0777)) {
                                $this->_error('Unable to create directory {'
                                        . $v_header['filename'] . '}');
                                return false;
                            }
                        }
                    } elseif ($v_header['typeflag'] == "2") {
                        if (!@symlink($v_header['link'], $v_header['filename'])) {
                            $this->_error('Unable to extract symbolic link {'
                                    . $v_header['filename'] . '}');
                            return false;
                        }
                    } else {
                        if (($v_dest_file = @fopen($v_header['filename'], "wb")) == 0) {
                            $this->_error('Error while opening {' . $v_header['filename']
                                    . '} in write binary mode');
                            return false;
                        } else {
                            $n = floor($v_header['size'] / 512);
                            for ($i = 0; $i < $n; $i++) {
                                $v_content = $this->_readBlock();
                                fwrite($v_dest_file, $v_content, 512);
                            }
                            if (($v_header['size'] % 512) != 0) {
                                $v_content = $this->_readBlock();
                                fwrite($v_dest_file, $v_content, ($v_header['size'] % 512));
                            }
                            @fclose($v_dest_file);
                            @touch($v_header['filename'], $v_header['mtime']);
                            if ($v_header['mode'] & 0111) {
                                $mode = fileperms($v_header['filename']) | (~umask() & 0111);
                                @chmod($v_header['filename'], $mode);
                            }
                        }
                        clearstatcache();
                        if (filesize($v_header['filename']) != $v_header['size']) {
                            $this->_error('Extracted file ' . $v_header['filename']
                                    . ' does not have the correct file size \''
                                    . filesize($v_header['filename'])
                                    . '\' (' . $v_header['size']
                                    . ' expected). Archive may be corrupted.');
                            return false;
                        }
                    }
                } else {
                    $this->_jumpBlock(ceil(($v_header['size'] / 512)));
                }
            } else {
                $this->_jumpBlock(ceil(($v_header['size'] / 512)));
            }
            if ($v_listing || $v_extract_file || $v_extraction_stopped) {
                if (($v_file_dir = dirname($v_header['filename'])) == $v_header['filename'])
                    $v_file_dir = '';
                if ((substr($v_header['filename'], 0, 1) == '/') && ($v_file_dir == ''))
                    $v_file_dir = '/';
                $p_list_detail[$v_nb++] = $v_header;
                if (is_array($p_file_list) && (count($p_list_detail) == count($p_file_list))) {
                    return true;
                }
            }
        }
        return true;
    }

    function _openAppend() {
        if (filesize($this->_tarname) == 0)
            return $this->_openWrite();
        if ($this->_compress) {
            $this->_close();
            if (!@rename($this->_tarname, $this->_tarname . ".tmp")) {
                $this->_error('Error while renaming \'' . $this->_tarname
                        . '\' to temporary file \'' . $this->_tarname
                        . '.tmp\'');
                return false;
            }
            if ($this->_compress_type == 'gz')
                $v_temp_tar = @gzopen($this->_tarname . ".tmp", "rb");
            elseif ($this->_compress_type == 'bz2')
                $v_temp_tar = @bzopen($this->_tarname . ".tmp", "rb");
            if ($v_temp_tar == 0) {
                $this->_error('Unable to open file \'' . $this->_tarname
                        . '.tmp\' in binary read mode');
                @rename($this->_tarname . ".tmp", $this->_tarname);
                return false;
            }
            if (!$this->_openWrite()) {
                @rename($this->_tarname . ".tmp", $this->_tarname);
                return false;
            }
            if ($this->_compress_type == 'gz') {
                while (!@gzeof($v_temp_tar)) {
                    $v_buffer = @gzread($v_temp_tar, 512);
                    if ($v_buffer == ARCHIVE_TAR_END_BLOCK) {
                        continue;
                    }
                    $v_binary_data = pack("a512", $v_buffer);
                    $this->_writeBlock($v_binary_data);
                }
                @gzclose($v_temp_tar);
            } elseif ($this->_compress_type == 'bz2') {
                while (strlen($v_buffer = @bzread($v_temp_tar, 512)) > 0) {
                    if ($v_buffer == ARCHIVE_TAR_END_BLOCK) {
                        continue;
                    }
                    $v_binary_data = pack("a512", $v_buffer);
                    $this->_writeBlock($v_binary_data);
                }
                @bzclose($v_temp_tar);
            }
            if (!@unlink($this->_tarname . ".tmp")) {
                $this->_error('Error while deleting temporary file \''
                        . $this->_tarname . '.tmp\'');
            }
        } else {
            if (!$this->_openReadWrite())
                return false;
            clearstatcache();
            $v_size = filesize($this->_tarname);
            fseek($this->_file, $v_size - 1024);
            if (fread($this->_file, 512) == ARCHIVE_TAR_END_BLOCK) {
                fseek($this->_file, $v_size - 1024);
            } elseif (fread($this->_file, 512) == ARCHIVE_TAR_END_BLOCK) {
                fseek($this->_file, $v_size - 512);
            }
        }
        return true;
    }

    function _append($p_filelist, $p_add_dir = '', $p_remove_dir = '') {
        if (!$this->_openAppend())
            return false;
        if ($this->_addList($p_filelist, $p_add_dir, $p_remove_dir))
            $this->_writeFooter();
        $this->_close();
        return true;
    }

    function _dirCheck($p_dir) {
        clearstatcache();
        if ((@is_dir($p_dir)) || ($p_dir == ''))
            return true;
        $p_parent_dir = dirname($p_dir);
        if (($p_parent_dir != $p_dir) &&
                ($p_parent_dir != '') &&
                (!$this->_dirCheck($p_parent_dir)))
            return false;
        if (!@mkdir($p_dir, 0777)) {
            $this->_error("Unable to create directory '$p_dir'");
            return false;
        }
        return true;
    }

    function _pathReduction($p_dir) {
        $v_result = '';
        if ($p_dir != '') {
            $v_list = explode('/', $p_dir);
            for ($i = sizeof($v_list) - 1; $i >= 0; $i--) {
                if ($v_list[$i] == ".") {
                    
                } else if ($v_list[$i] == "..") {
                    $i--;
                } else if (($v_list[$i] == '') && ($i != (sizeof($v_list) - 1)) && ($i != 0)) {
                    
                } else {
                    $v_result = $v_list[$i] . ($i != (sizeof($v_list) - 1) ? '/'
                                    . $v_result : '');
                }
            }
        }
        $v_result = strtr($v_result, '\\', '/');
        return $v_result;
    }

    function _translateWinPath($p_path, $p_remove_disk_letter = true) {
        if (defined('OS_WINDOWS') && OS_WINDOWS) {
            if (($p_remove_disk_letter) && (($v_position = strpos($p_path, ':')) != false)) {
                $p_path = substr($p_path, $v_position + 1);
            }
            if ((strpos($p_path, '\\') > 0) || (substr($p_path, 0, 1) == '\\')) {
                $p_path = strtr($p_path, '\\', '/');
            }
        }
        return $p_path;
    }

}

?>
