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Edit File: Rar.php

<?php
/**
 * Copyright 2008-2017 Horde LLC (http://www.horde.org/)
 *
 * See the enclosed file COPYING for license information (LGPL). If you
 * did not receive this file, see http://www.horde.org/licenses/lgpl21.
 *
 * @author   Michael Cochrane <mike@graftonhall.co.nz>
 * @author   Michael Slusarz <slusarz@horde.org>
 * @category Horde
 * @license  http://www.horde.org/licenses/lgpl21 LGPL 2.1
 * @package  Compress
 */

/**
 * This class allows rar files to be read.
 *
 * @author    Michael Cochrane <mike@graftonhall.co.nz>
 * @author    Michael Slusarz <slusarz@horde.org>
 * @category  Horde
 * @copyright 2008-2017 Horde LLC
 * @license   http://www.horde.org/licenses/lgpl21 LGPL 2.1
 * @package   Compress
 */
class Horde_Compress_Rar extends Horde_Compress_Base
{
    const BLOCK_START = "\x52\x61\x72\x21\x1a\x07\x00";

/**
     */
    public $canDecompress = true;

/**
     * Rar compression methods
     *
     * @var array
     */
    protected $_methods = array(
        0x30 => 'Store',
        0x31 => 'Fastest',
        0x32 => 'Fast',
        0x33 => 'Normal',
        0x34 => 'Good',
        0x35 => 'Best'
    );

/**
     * @return array  Info on the compressed file:
     * <pre>
     * KEY: Position in RAR archive
     * VALUES:
     *   attr - File attributes
     *   date - File modification time
     *   csize - Compressed file size
     *   method - Compression method
     *   name - Filename
     *   size - Original file size
     * </pre>
     *
     * @throws Horde_Compress_Exception
     */
    public function decompress($data, array $params = array())
    {
        $blockStart = strpos($data, self::BLOCK_START);
        if ($blockStart === false) {
            throw new Horde_Compress_Exception(Horde_Compress_Translation::t("Invalid RAR data."));
        }

$data_len = strlen($data);
        $position = $blockStart + 7;
        $return_array = array();

while ($position < $data_len) {
            if ($position + 7 > $data_len) {
                throw new Horde_Compress_Exception(Horde_Compress_Translation::t("Invalid RAR data."));
            }
            //$head_crc = substr($data, $position, 2);
            $head_type = ord(substr($data, $position + 2, 1));
            $head_flags = unpack('vFlags', substr($data, $position + 3, 2));
            $head_flags = $head_flags['Flags'];
            $head_size = unpack('vSize', substr($data, $position + 5, 2));
            $head_size = $head_size['Size'];

$position += 7;
            $head_size -= 7;

switch ($head_type) {
            case 0x73:
                /* Archive header */
                $position += $head_size;
                break;

case 0x74:
                /* File Header */
                $info = unpack(
                    'VPacked/VUnpacked/COS/VCRC32/VTime/CVersion/CMethod/vLength/vAttrib',
                    substr($data, $position)
                );
                $year = (($info['Time'] >> 25) & 0x7f) + 80;
                $name = substr($data, $position + 25, $info['Length']);
                if ($unicode = strpos($name, "\0")) {
                    $name = substr($name, 0, $unicode);
                }

$return_array[] = array(
                    'name' => $name,
                    'size' => $info['Unpacked'],
                    'csize' => $info['Packed'],
                    'date' => mktime(
                        (($info['Time'] >> 11) & 0x1f),
                        (($info['Time'] >> 5) & 0x3f),
                        (($info['Time'] << 1) & 0x3e),
                        (($info['Time'] >> 21) & 0x07),
                        (($info['Time'] >> 16) & 0x1f),
                        $year < 1900 ? $year + 1900 : $year
                    ),
                    'method' => $this->_methods[$info['Method']],
                    'attr' => (($info['Attrib'] & 0x10) ? 'D' : '-') .
                              (($info['Attrib'] & 0x20) ? 'A' : '-') .
                              (($info['Attrib'] & 0x03) ? 'S' : '-') .
                              (($info['Attrib'] & 0x02) ? 'H' : '-') .
                              (($info['Attrib'] & 0x01) ? 'R' : '-')
                );

$position += $head_size + $info['Packed'];
                break;

default:
                if ($head_size == -7) {
                    /* We've already added 7 bytes above. If we remove those
                     * same 7 bytes, we will enter an infinite loop. */
                    throw new Horde_Compress_Exception(Horde_Compress_Translation::t("Invalid RAR data."));
                }
                $position += $head_size;
                break;
            }
        }

return $return_array;
    }
}