<?php
/*
Flocke's "Archive on the Fly"
Set of PHP classes to create archives on the fly plus a class to extract
the contents of ZIP files. See the included file README.txt for information
on how to use it.
This file: vs.unzip.php (class to read zip archives)
Version 1.2c - always find the latest version at
http://flocke.vssd.de/prog/code/php/aotf/
Copyright (C) 2005 Volker Siebert <flocke@vssd.de>
All rights reserved.
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
*/
class vsUnzipFile {
var $handle; // Handle to the file
var $filesize; // Size of the file
var $names; // List with names and indexes
var $directory; // Central directory
var $count; // Number of entries in central directory
var $comment; // ZIP file comment
var $errors; // Array with error messages
function vsUnzipFile()
{
$this->handle = 0;
$this->errors = array();
$this->close();
}
// Close archive
function close()
{
if (!empty($this->handle))
fclose($this->handle);
$this->handle = 0;
$this->filesize = 0;
$this->count = 0;
$this->names = array();
$this->directory = array();
}
function _dostime2time($dostime)
{
return mktime( ($dostime >> 11) & 0x1f,
($dostime >> 5) & 0x3f,
($dostime << 1) & 0x3f,
($dostime >> 21) & 0x0f,
($dostime >> 16) & 0x1f,
(($dostime >> 25) & 0x7f) + 1980);
}
function _unpack_cdfh($dir, $offs)
{
$hdr = unpack('Vmagic/v2version/vgpbf/vmethod/'
. 'Vdosdate/Vcrc32/Vcsize/Vosize/'
. 'vnamelen/vextra/vcmntlen/vdisk/'
. 'viattr/Veattr/Voffset', $dir);
if ($hdr['magic'] != 0x02014b50
|| $hdr['version2'] > 20
|| $hdr['offset'] < 0
|| $hdr['offset'] > $offs - 30)
{
$this->errors[] = 'Invalid central directory file header entry';
return false;
}
if ($hdr['method'] != 0 && $hdr['method'] != 8)
{
$this->errors[] = 'Unknown compression method';
return false;
}
$name = substr($dir, 46, $hdr['namelen']);
$extra = substr($dir, 46 + $hdr['namelen'], $hdr['extra']);
$eattr = $hdr['eattr'] & 0x3f;
if (substr($name, -1, 1) == '/')
$eattr |= 0x10;
return array(
'magic' => $hdr['magic'],
'name' => $name,
'gpbf' => $hdr['gpbf'],
'method' => $hdr['method'],
'time' => $this->_dostime2time($hdr['dosdate']),
'crc32' => $hdr['crc32'],
'csize' => $hdr['csize'],
'osize' => $hdr['osize'],
'eattr' => $eattr,
'offset' => $hdr['offset'],
'extra' => $extra,
'hdrlen' => 46 + $hdr['namelen'] + $hdr['extra'] + $hdr['cmntlen']
);
}
function _unpack_lfh($dir)
{
$hdr = unpack('Vmagic/vversion/vgpbf/vmethod/'
. 'Vdosdate/Vcrc32/Vcsize/Vosize/'
. 'vnamelen/vextra', $dir);
if ($hdr['magic'] != 0x04034b50
|| $hdr['version'] > 20)
{
$this->errors[] = 'Invalid local file header entry';
return false;
}
if ($hdr['method'] != 0 && $hdr['method'] != 8)
{
$this->errors[] = 'Unknown compression method';
return false;
}
$name = substr($dir, 30, $hdr['namelen']);
$extra = substr($dir, 30 + $hdr['namelen'], $hdr['extra']);
return array(
'magic' => $hdr['magic'],
'name' => $name,
'gpbf' => $hdr['gpbf'],
'method' => $hdr['method'],
'time' => $this->_dostime2time($hdr['dosdate']),
'crc32' => $hdr['crc32'],
'csize' => $hdr['csize'],
'osize' => $hdr['osize'],
'extra' => $extra,
'hdrlen' => 30 + $hdr['namelen'] + $hdr['extra']
);
}
function open($filename)
{
$this->close();
$this->errors = array();
$this->handle = @fopen($filename, "rb");
if ($this->handle === false)
{
$this->errors[] = 'Cannot open input file';
$this->handle = 0;
return false;
}
$this->filesize = filesize($filename);
if ($this->filesize < 22)
{
$this->errors[] = 'Invalid input file';
$this->close();
return false;
}
$size = 1024;
if ($size < $this->filesize)
$size = $this->filesize;
$offs = $this->filesize - $size;
fseek($this->handle, $offs, SEEK_SET);
$tail = fread($this->handle, $size);
$sign = pack('Vvv', 0x06054b50, 0, 0);
$pos = strpos($tail, $sign);
if ($pos === false)
{
$this->errors[] = 'Invalid input file';
$this->close();
return false;
}
$offs += $pos;
$tail = substr($tail, $pos);
$eod = unpack('Vmagic/v2disk/v2count/Vdirlen/Voffset/vcomment', $tail);
if ($eod['magic'] != 0x06054b50
|| $eod['disk1'] != 0
|| $eod['disk2'] != 0
|| $eod['count1'] != $eod['count2']
|| $eod['dirlen'] < 0
|| $eod['dirlen'] > $offs
|| $eod['offset'] < 0
|| $eod['offset'] + $eod['dirlen'] > $offs)
{
$this->errors[] = 'Invalid input file';
$this->close();
return false;
}
$this->comment = substr($tail, 22, $eod['comment']);
$offs = $eod['offset'];
fseek($this->handle, $offs, SEEK_SET);
$dir = fread($this->handle, $eod['dirlen']);
while ($dir != '')
{
$cde = $this->_unpack_cdfh($dir, $offs);
if ($cde === false)
{
$this->close();
return false;
}
$dir = substr($dir, $cde['hdrlen']);
$name = $cde['name'];
$this->count += 1;
$this->names[] = $name;
$this->directory[$name] = $cde;
if ($cde['osize'] == 0)
$this->directory[$name]['data'] = '';
}
return true;
}
// Fix the index
function _fix_index($index)
{
if (eregi("^[0-9]+$", $index))
$index = $this->names[intval($index)];
return "$index";
}
// Return an entry from the directory
function &get_entry($index)
{
return $this->directory[$this->_fix_index($index)];
}
// Return the data for the given entry
function &get_data($index)
{
$entry =& $this->get_entry($index);
if (!isset($entry['data']))
{
fseek($this->handle, $entry['offset'], SEEK_SET);
$dir = fread($this->handle, 30 + 512);
$lfh = $this->_unpack_lfh($dir);
if ($lfh === false)
{
$entry['data'] = '';
$entry['error'] = 1;
return $entry['data'];
}
if ( $lfh['name' ] != $entry['name']
|| $lfh['gpbf' ] != $entry['gpbf' ]
|| $lfh['method'] != $entry['method']
|| $lfh['time' ] != $entry['time' ]
|| $lfh['crc32' ] != $entry['crc32' ]
|| $lfh['csize' ] != $entry['csize' ]
|| $lfh['osize' ] != $entry['osize' ])
{
$this->errors[] = 'Central directory / local file header mismatch';
$entry['data'] = '';
$entry['error'] = 1;
return $entry['data'];
}
fseek($this->handle, $entry['offset'] + $lfh['hdrlen'], SEEK_SET);
if ($entry['method'] != 8)
$entry['data'] = fread($this->handle, $entry['csize']);
else
$entry['data'] =
gzinflate(fread($this->handle, $entry['csize']), $entry['osize']);
$crc32 = crc32($entry['data']);
if ($crc32 != $entry['crc32'])
{
$this->errors[] = 'Checksum error';
$entry['error'] = 1;
}
}
return $entry['data'];
}
}
?> |
