<?php

/* --------------------------------------------------
  | TAR/GZIP/BZIP2/ZIP ARCHIVE CLASSES 2.1
  | By Devin Doucette
  | Copyright (c) 2005 Devin Doucette
  | Email: darksnoopy@shaw.ca
  +--------------------------------------------------
  | Email bugs/suggestions to darksnoopy@shaw.ca
  +--------------------------------------------------
  | This script has been created and released under
  | the GNU GPL and is free to use and redistribute
  | only if this copyright statement is not removed
  +-------------------------------------------------- */

class archive {

    function archive($name) {
        $this->options = array(
            'basedir' => ".",
            'name' => $name,
            'prepend' => "",
            'inmemory' => 0,
            'overwrite' => 0,
            'recurse' => 1,
            'storepaths' => 1,
            'followlinks' => 0,
            'level' => 3,
            'method' => 1,
            'sfx' => "",
            'type' => "",
            'comment' => ""
        );
        $this->files = array();
        $this->exclude = array();
        $this->storeonly = array();
        $this->error = array();
    }

    function set_options($options) {
        foreach ($options as $key => $value)
            $this->options[$key] = $value;
        if (!empty($this->options['basedir'])) {
            $this->options['basedir'] = str_replace("\\", "/", $this->options['basedir']);
            $this->options['basedir'] = preg_replace("/\/+/", "/", $this->options['basedir']);
            $this->options['basedir'] = preg_replace("/\/$/", "", $this->options['basedir']);
        }
        if (!empty($this->options['name'])) {
            $this->options['name'] = str_replace("\\", "/", $this->options['name']);
            $this->options['name'] = preg_replace("/\/+/", "/", $this->options['name']);
        }
        if (!empty($this->options['prepend'])) {
            $this->options['prepend'] = str_replace("\\", "/", $this->options['prepend']);
            $this->options['prepend'] = preg_replace("/^(\.*\/+)+/", "", $this->options['prepend']);
            $this->options['prepend'] = preg_replace("/\/+/", "/", $this->options['prepend']);
            $this->options['prepend'] = preg_replace("/\/$/", "", $this->options['prepend']) . "/";
        }
    }

    function create_archive() {
        $this->make_list();

        if ($this->options['inmemory'] == 0) {
            $pwd = getcwd();
            chdir($this->options['basedir']);
            if ($this->options['overwrite'] == 0 && file_exists($this->options['name'] . ($this->options['type'] == "gzip" || $this->options['type'] == "bzip" ? ".tmp" : ""))) {
                $this->error[] = "File {$this->options['name']} already exists.";
                chdir($pwd);
                return 0;
            } else if ($this->archive = @fopen($this->options['name'] . ($this->options['type'] == "gzip" || $this->options['type'] == "bzip" ? ".tmp" : ""), "wb+"))
                chdir($pwd);
            else {
                $this->error[] = "Could not open {$this->options['name']} for writing.";
                chdir($pwd);
                return 0;
            }
        } else
            $this->archive = "";

        switch ($this->options['type']) {
            case "zip":
                if (!$this->create_zip()) {
                    $this->error[] = "Could not create zip file.";
                    return 0;
                }
                break;
            case "bzip":
                if (!$this->create_tar()) {
                    $this->error[] = "Could not create tar file.";
                    return 0;
                }
                if (!$this->create_bzip()) {
                    $this->error[] = "Could not create bzip2 file.";
                    return 0;
                }
                break;
            case "gzip":
                if (!$this->create_tar()) {
                    $this->error[] = "Could not create tar file.";
                    return 0;
                }
                if (!$this->create_gzip()) {
                    $this->error[] = "Could not create gzip file.";
                    return 0;
                }
                break;
            case "tar":
                if (!$this->create_tar()) {
                    $this->error[] = "Could not create tar file.";
                    return 0;
                }
        }

        if ($this->options['inmemory'] == 0) {
            fclose($this->archive);
            if ($this->options['type'] == "gzip" || $this->options['type'] == "bzip")
                unlink($this->options['basedir'] . "/" . $this->options['name'] . ".tmp");
        }
    }

    function add_data($data) {
        if ($this->options['inmemory'] == 0)
            fwrite($this->archive, $data);
        else
            $this->archive .= $data;
    }

    function make_list() {
        if (!empty($this->exclude))
            foreach ($this->files as $key => $value)
                foreach ($this->exclude as $current)
                    if ($value['name'] == $current['name'])
                        unset($this->files[$key]);
        if (!empty($this->storeonly))
            foreach ($this->files as $key => $value)
                foreach ($this->storeonly as $current)
                    if ($value['name'] == $current['name'])
                        $this->files[$key]['method'] = 0;
        unset($this->exclude, $this->storeonly);
    }

    function add_files($list) {
        $temp = $this->list_files($list);
        foreach ($temp as $current)
            $this->files[] = $current;
    }

    function exclude_files($list) {
        $temp = $this->list_files($list);
        foreach ($temp as $current)
            $this->exclude[] = $current;
    }

    function store_files($list) {
        $temp = $this->list_files($list);
        foreach ($temp as $current)
            $this->storeonly[] = $current;
    }

    function list_files($list) {

        if (!is_array($list)) {
            $temp = $list;
            $list = array($temp);
            unset($temp);
        }

        $files = array();

        $pwd = getcwd();
        chdir($this->options['basedir']);

        foreach ($list as $current) {
            $current = str_replace("\\", "/", $current);
            $current = preg_replace("/\/+/", "/", $current);
            $current = preg_replace("/\/$/", "", $current);
            if (strstr($current, "*")) {
                $regex = preg_replace("/([\\\^\$\.\[\]\|\(\)\?\+\{\}\/])/", "\\\\\\1", $current);
                $regex = str_replace("*", ".*", $regex);
                $dir = strstr($current, "/") ? substr($current, 0, strrpos($current, "/")) : ".";
                $temp = $this->parse_dir($dir);
                foreach ($temp as $current2)
                    if (preg_match("/^{$regex}$/i", $current2['name']))
                        $files[] = $current2;
                unset($regex, $dir, $temp, $current);
            }
            else if (@is_dir($current)) {
                $temp = $this->parse_dir($current);
                foreach ($temp as $file)
                    $files[] = $file;
                unset($temp, $file);
            } else if (@file_exists($current))
                $files[] = array('name' => $current, 'name2' => $this->options['prepend'] .
                    preg_replace("/(\.+\/+)+/", "", ($this->options['storepaths'] == 0 && strstr($current, "/")) ?
                                    substr($current, strrpos($current, "/") + 1) : $current),
                    'type' => @is_link($current) && $this->options['followlinks'] == 0 ? 2 : 0,
                    'ext' => substr($current, strrpos($current, ".")), 'stat' => stat($current));
        }

        @chdir($pwd);

        unset($current, $pwd);

        usort($files, array("archive", "sort_files"));

        return $files;
    }

    function parse_dir($dirname) {
        if ($this->options['storepaths'] == 1 && !preg_match("/^(\.+\/*)+$/", $dirname))
            $files = array(array('name' => $dirname, 'name2' => $this->options['prepend'] .
                    preg_replace("/(\.+\/+)+/", "", ($this->options['storepaths'] == 0 && strstr($dirname, "/")) ?
                                    substr($dirname, strrpos($dirname, "/") + 1) : $dirname), 'type' => 5, 'stat' => stat($dirname)));
        else
            $files = array();
        $dir = @opendir($dirname);

        while ($file = @readdir($dir)) {
            $fullname = $dirname . "/" . $file;
            if ($file == "." || $file == "..")
                continue;
            else if (@is_dir($fullname)) {
                if (empty($this->options['recurse']))
                    continue;
                $temp = $this->parse_dir($fullname);
                foreach ($temp as $file2)
                    $files[] = $file2;
            }
            else if (@file_exists($fullname))
                $files[] = array('name' => $fullname, 'name2' => $this->options['prepend'] .
                    preg_replace("/(\.+\/+)+/", "", ($this->options['storepaths'] == 0 && strstr($fullname, "/")) ?
                                    substr($fullname, strrpos($fullname, "/") + 1) : $fullname),
                    'type' => @is_link($fullname) && $this->options['followlinks'] == 0 ? 2 : 0,
                    'ext' => substr($file, strrpos($file, ".")), 'stat' => stat($fullname));
        }

        @closedir($dir);

        return $files;
    }

    function sort_files($a, $b) {
        if ($a['type'] != $b['type'])
            if ($a['type'] == 5 || $b['type'] == 2)
                return -1;
            else if ($a['type'] == 2 || $b['type'] == 5)
                return 1;
            else if ($a['type'] == 5)
                return strcmp(strtolower($a['name']), strtolower($b['name']));
            else if ($a['ext'] != $b['ext'])
                return strcmp($a['ext'], $b['ext']);
            else if ($a['stat'][7] != $b['stat'][7])
                return $a['stat'][7] > $b['stat'][7] ? -1 : 1;
            else
                return strcmp(strtolower($a['name']), strtolower($b['name']));
        return 0;
    }

    /**
     * @param string $name - name of zip file as it's presented to the browser.
     */
    function download_file($name) {
        // Remove any double quotes or other rubbish in the file name which could cause problems.
        $name = preg_replace('/[^-_a-z0-9\.]/i', '', $name);
        
        switch ($this->options['type']) {
            case "zip":
                header("Content-Type: application/zip");
                break;
            case "bzip":
                header("Content-Type: application/x-bzip2");
                break;
            case "gzip":
                header("Content-Type: application/x-gzip");
                break;
            case "tar":
                header("Content-Type: application/x-tar");
        }
        header("Pragma: public");
        header('Content-disposition: attachment; filename="' . $name . '.zip"');
        //header("Cache-Control: no-cache, must-revalidate, post-check=0, pre-check=0");
        //header("Expires: Sat, 01 Jan 2000 12:00:00 GMT");
        header("Content-Transfer-Encoding: binary");
        if ($this->options['inmemory'] == 1) {
            header("Content-Length: " . strlen($this->archive));
            print($this->archive);
        } else {
            /* $this->options['name'] is the temporary file we created in the constructor */
            $filename = $this->options['name'] . ($this->options['type'] == "gzip" || $this->options['type'] == "bzip" ? ".tmp" : "");
            if(!file_exists($filename)) {
                _debug("ERROR: How can we open a non-existent file for download/writing ? : $filename");
                die("Download failed; file not found.");
            }
            
            $fp = fopen($filename,"rb");
            header("Content-Length: " . filesize($filename));
            _debug("Opening file / fpassthru");
            $res = fpassthru($fp);
            _debug("Written " . $res . " bytes");
            fclose($fp);
            
        }
    }

}

class tar_file extends archive {

    function tar_file($name) {
        $this->archive($name);
        $this->options['type'] = "tar";
    }

    function create_tar() {
        $pwd = getcwd();
        chdir($this->options['basedir']);

        foreach ($this->files as $current) {
            if ($current['name'] == $this->options['name'])
                continue;
            if (strlen($current['name2']) > 99) {
                $path = substr($current['name2'], 0, strpos($current['name2'], "/", strlen($current['name2']) - 100) + 1);
                $current['name2'] = substr($current['name2'], strlen($path));
                if (strlen($path) > 154 || strlen($current['name2']) > 99) {
                    $this->error[] = "Could not add {$path}{$current['name2']} to archive because the filename is too long.";
                    continue;
                }
            }
            $block = pack("a100a8a8a8a12a12a8a1a100a6a2a32a32a8a8a155a12", $current['name2'], sprintf("%07o", $current['stat'][2]), sprintf("%07o", $current['stat'][4]), sprintf("%07o", $current['stat'][5]), sprintf("%011o", $current['type'] == 2 ? 0 : $current['stat'][7]), sprintf("%011o", $current['stat'][9]), "        ", $current['type'], $current['type'] == 2 ? @readlink($current['name']) : "", "ustar ", " ", "Unknown", "Unknown", "", "", !empty($path) ? $path : "", "");

            $checksum = 0;
            for ($i = 0; $i < 512; $i++)
                $checksum += ord(substr($block, $i, 1));
            $checksum = pack("a8", sprintf("%07o", $checksum));
            $block = substr_replace($block, $checksum, 148, 8);

            if ($current['type'] == 2 || $current['stat'][7] == 0)
                $this->add_data($block);
            else if ($fp = @fopen($current['name'], "rb")) {
                $this->add_data($block);
                while ($temp = fread($fp, 1048576))
                    $this->add_data($temp);
                if ($current['stat'][7] % 512 > 0) {
                    $temp = "";
                    for ($i = 0; $i < 512 - $current['stat'][7] % 512; $i++)
                        $temp .= "\0";
                    $this->add_data($temp);
                }
                fclose($fp);
            } else
                $this->error[] = "Could not open file {$current['name']} for reading. It was not added.";
        }

        $this->add_data(pack("a1024", ""));

        chdir($pwd);

        return 1;
    }

    function extract_files() {
        $pwd = getcwd();
        chdir($this->options['basedir']);

        if ($fp = $this->open_archive()) {
            if ($this->options['inmemory'] == 1)
                $this->files = array();

            while ($block = fread($fp, 512)) {
                $temp = unpack("a100name/a8mode/a8uid/a8gid/a12size/a12mtime/a8checksum/a1type/a100symlink/a6magic/a2temp/a32temp/a32temp/a8temp/a8temp/a155prefix/a12temp", $block);
                $file = array(
                    'name' => $temp['prefix'] . $temp['name'],
                    'stat' => array(
                        2 => $temp['mode'],
                        4 => octdec($temp['uid']),
                        5 => octdec($temp['gid']),
                        7 => octdec($temp['size']),
                        9 => octdec($temp['mtime']),
                    ),
                    'checksum' => octdec($temp['checksum']),
                    'type' => $temp['type'],
                    'magic' => $temp['magic'],
                );
                if ($file['checksum'] == 0x00000000)
                    break;
                else if (substr($file['magic'], 0, 5) != "ustar") {
                    $this->error[] = "This script does not support extracting this type of tar file.";
                    break;
                }
                $block = substr_replace($block, "        ", 148, 8);
                $checksum = 0;
                for ($i = 0; $i < 512; $i++)
                    $checksum += ord(substr($block, $i, 1));
                if ($file['checksum'] != $checksum)
                    $this->error[] = "Could not extract from {$this->options['name']}, it is corrupt.";

                if ($this->options['inmemory'] == 1) {
                    $file['data'] = fread($fp, $file['stat'][7]);
                    fread($fp, (512 - $file['stat'][7] % 512) == 512 ? 0 : (512 - $file['stat'][7] % 512));
                    unset($file['checksum'], $file['magic']);
                    $this->files[] = $file;
                } else if ($file['type'] == 5) {
                    if (!is_dir($file['name']))
                        mkdir($file['name'], $file['stat'][2]);
                }
                else if ($this->options['overwrite'] == 0 && file_exists($file['name'])) {
                    $this->error[] = "{$file['name']} already exists.";
                    continue;
                } else if ($file['type'] == 2) {
                    symlink($temp['symlink'], $file['name']);
                    chmod($file['name'], $file['stat'][2]);
                } else if ($new = @fopen($file['name'], "wb")) {
                    fwrite($new, fread($fp, $file['stat'][7]));
                    fread($fp, (512 - $file['stat'][7] % 512) == 512 ? 0 : (512 - $file['stat'][7] % 512));
                    fclose($new);
                    chmod($file['name'], $file['stat'][2]);
                } else {
                    $this->error[] = "Could not open {$file['name']} for writing.";
                    continue;
                }
                chown($file['name'], $file['stat'][4]);
                chgrp($file['name'], $file['stat'][5]);
                touch($file['name'], $file['stat'][9]);
                unset($file);
            }
        } else
            $this->error[] = "Could not open file {$this->options['name']}";

        chdir($pwd);
    }

    function open_archive() {
        return @fopen($this->options['name'], "rb");
    }

}

class gzip_file extends tar_file {

    function gzip_file($name) {
        $this->tar_file($name);
        $this->options['type'] = "gzip";
    }

    function create_gzip() {
        if ($this->options['inmemory'] == 0) {
            $pwd = getcwd();
            chdir($this->options['basedir']);
            if ($fp = gzopen($this->options['name'], "wb{$this->options['level']}")) {
                fseek($this->archive, 0);
                while ($temp = fread($this->archive, 1048576))
                    gzwrite($fp, $temp);
                gzclose($fp);
                chdir($pwd);
            } else {
                $this->error[] = "Could not open {$this->options['name']} for writing.";
                chdir($pwd);
                return 0;
            }
        } else
            $this->archive = gzencode($this->archive, $this->options['level']);

        return 1;
    }

    function open_archive() {
        return @gzopen($this->options['name'], "rb");
    }

}

class bzip_file extends tar_file {

    function bzip_file($name) {
        $this->tar_file($name);
        $this->options['type'] = "bzip";
    }

    function create_bzip() {
        if ($this->options['inmemory'] == 0) {
            $pwd = getcwd();
            chdir($this->options['basedir']);
            if ($fp = bzopen($this->options['name'], "wb")) {
                fseek($this->archive, 0);
                while ($temp = fread($this->archive, 1048576))
                    bzwrite($fp, $temp);
                bzclose($fp);
                chdir($pwd);
            } else {
                $this->error[] = "Could not open {$this->options['name']} for writing.";
                chdir($pwd);
                return 0;
            }
        } else
            $this->archive = bzcompress($this->archive, $this->options['level']);

        return 1;
    }

    function open_archive() {
        return @bzopen($this->options['name'], "rb");
    }

}

class zip_file extends archive {

    function zip_file($name) {
        $this->archive($name);
        $this->options['type'] = "zip";
    }

    function create_zip() {
        $files = 0;
        $offset = 0;
        $central = "";

        if (!empty($this->options['sfx']))
            if ($fp = @fopen($this->options['sfx'], "rb")) {
                $temp = fread($fp, filesize($this->options['sfx']));
                fclose($fp);
                $this->add_data($temp);
                $offset += strlen($temp);
                unset($temp);
            } else
                $this->error[] = "Could not open sfx module from {$this->options['sfx']}.";

        $pwd = getcwd();
        chdir($this->options['basedir']);

        foreach ($this->files as $current) {
            if ($current['name'] == $this->options['name'])
                continue;

            $timedate = explode(" ", date("Y n j G i s", $current['stat'][9]));
            $timedate = ($timedate[0] - 1980 << 25) | ($timedate[1] << 21) | ($timedate[2] << 16) |
                    ($timedate[3] << 11) | ($timedate[4] << 5) | ($timedate[5]);

            $block = pack("VvvvV", 0x04034b50, 0x000A, 0x0000, (isset($current['method']) || $this->options['method'] == 0) ? 0x0000 : 0x0008, $timedate);

            if ($current['stat'][7] == 0 && $current['type'] == 5) {
                $block .= pack("VVVvv", 0x00000000, 0x00000000, 0x00000000, strlen($current['name2']) + 1, 0x0000);
                $block .= $current['name2'] . "/";
                $this->add_data($block);
                $central .= pack("VvvvvVVVVvvvvvVV", 0x02014b50, 0x0014, $this->options['method'] == 0 ? 0x0000 : 0x000A, 0x0000, (isset($current['method']) || $this->options['method'] == 0) ? 0x0000 : 0x0008, $timedate, 0x00000000, 0x00000000, 0x00000000, strlen($current['name2']) + 1, 0x0000, 0x0000, 0x0000, 0x0000, $current['type'] == 5 ? 0x00000010 : 0x00000000, $offset);
                $central .= $current['name2'] . "/";
                $files++;
                $offset += (31 + strlen($current['name2']));
            } else if ($current['stat'][7] == 0) {
                $block .= pack("VVVvv", 0x00000000, 0x00000000, 0x00000000, strlen($current['name2']), 0x0000);
                $block .= $current['name2'];
                $this->add_data($block);
                $central .= pack("VvvvvVVVVvvvvvVV", 0x02014b50, 0x0014, $this->options['method'] == 0 ? 0x0000 : 0x000A, 0x0000, (isset($current['method']) || $this->options['method'] == 0) ? 0x0000 : 0x0008, $timedate, 0x00000000, 0x00000000, 0x00000000, strlen($current['name2']), 0x0000, 0x0000, 0x0000, 0x0000, $current['type'] == 5 ? 0x00000010 : 0x00000000, $offset);
                $central .= $current['name2'];
                $files++;
                $offset += (30 + strlen($current['name2']));
            } else if ($fp = @fopen($current['name'], "rb")) {
                $temp = fread($fp, $current['stat'][7]);
                fclose($fp);
                $crc32 = crc32($temp);
                if (!isset($current['method']) && $this->options['method'] == 1) {
                    $temp = gzcompress($temp, $this->options['level']);
                    $size = strlen($temp) - 6;
                    $temp = substr($temp, 2, $size);
                } else
                    $size = strlen($temp);
                $block .= pack("VVVvv", $crc32, $size, $current['stat'][7], strlen($current['name2']), 0x0000);
                $block .= $current['name2'];
                $this->add_data($block);
                $this->add_data($temp);
                unset($temp);
                $central .= pack("VvvvvVVVVvvvvvVV", 0x02014b50, 0x0014, $this->options['method'] == 0 ? 0x0000 : 0x000A, 0x0000, (isset($current['method']) || $this->options['method'] == 0) ? 0x0000 : 0x0008, $timedate, $crc32, $size, $current['stat'][7], strlen($current['name2']), 0x0000, 0x0000, 0x0000, 0x0000, 0x00000000, $offset);
                $central .= $current['name2'];
                $files++;
                $offset += (30 + strlen($current['name2']) + $size);
            } else
                $this->error[] = "Could not open file {$current['name']} for reading. It was not added.";
        }

        $this->add_data($central);

        $this->add_data(pack("VvvvvVVv", 0x06054b50, 0x0000, 0x0000, $files, $files, strlen($central), $offset, !empty($this->options['comment']) ? strlen($this->options['comment']) : 0x0000));

        if (!empty($this->options['comment']))
            $this->add_data($this->options['comment']);

        @chdir($pwd);

        return 1;
    }

}

?>
