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<?php
/////////////////////////////////////////////////////////////////
/// getID3() by James Heinrich <info@getid3.org> //
// available at https://github.com/JamesHeinrich/getID3 //
// or https://www.getid3.org //
// or http://getid3.sourceforge.net //
// see readme.txt for more details //
/////////////////////////////////////////////////////////////////
// //
// module.archive.gzip.php //
// module for analyzing GZIP files //
// dependencies: NONE //
// ///
/////////////////////////////////////////////////////////////////
// //
// Module originally written by //
// Mike Mozolin <teddybearØmail*ru> //
// //
/////////////////////////////////////////////////////////////////
if (!defined('GETID3_INCLUDEPATH')) { // prevent path-exposing attacks that access modules directly on public webservers
exit;
}
class getid3_gzip extends getid3_handler
{
/**
* Optional file list - disable for speed.
*
* Decode gzipped files, if possible, and parse recursively (.tar.gz for example).
*
* @var bool
*/
public $option_gzip_parse_contents = false;
/**
* @return bool
*/
public function Analyze() {
$info = &$this->getid3->info;
$info['fileformat'] = 'gzip';
$start_length = 10;
$unpack_header = 'a1id1/a1id2/a1cmethod/a1flags/a4mtime/a1xflags/a1os';
//+---+---+---+---+---+---+---+---+---+---+
//|ID1|ID2|CM |FLG| MTIME |XFL|OS |
//+---+---+---+---+---+---+---+---+---+---+
if ($info['php_memory_limit'] && ($info['filesize'] > $info['php_memory_limit'])) {
$this->error('File is too large ('.number_format($info['filesize']).' bytes) to read into memory (limit: '.number_format($info['php_memory_limit'] / 1048576).'MB)');
return false;
}
$this->fseek(0);
$buffer = $this->fread($info['filesize']);
$arr_members = explode("\x1F\x8B\x08", $buffer);
$num_members = 0;
while (true) {
$is_wrong_members = false;
$num_members = intval(count($arr_members));
for ($i = 0; $i < $num_members; $i++) {
if (strlen($arr_members[$i]) == 0) {
continue;
}
$buf = "\x1F\x8B\x08".$arr_members[$i];
$attr = unpack($unpack_header, substr($buf, 0, $start_length));
if (!$this->get_os_type(ord($attr['os']))) {
// Merge member with previous if wrong OS type
$arr_members[($i - 1)] .= $buf;
$arr_members[$i] = '';
$is_wrong_members = true;
continue;
}
}
if (!$is_wrong_members) {
break;
}
}
$info['gzip']['files'] = array();
$fpointer = 0;
$idx = 0;
for ($i = 0; $i < $num_members; $i++) {
if (strlen($arr_members[$i]) == 0) {
continue;
}
$thisInfo = &$info['gzip']['member_header'][++$idx];
$buff = "\x1F\x8B\x08".$arr_members[$i];
$attr = unpack($unpack_header, substr($buff, 0, $start_length));
$thisInfo['filemtime'] = getid3_lib::LittleEndian2Int($attr['mtime']);
$thisInfo['raw']['id1'] = ord($attr['cmethod']);
$thisInfo['raw']['id2'] = ord($attr['cmethod']);
$thisInfo['raw']['cmethod'] = ord($attr['cmethod']);
$thisInfo['raw']['os'] = ord($attr['os']);
$thisInfo['raw']['xflags'] = ord($attr['xflags']);
$thisInfo['raw']['flags'] = ord($attr['flags']);
$thisInfo['flags']['crc16'] = (bool) ($thisInfo['raw']['flags'] & 0x02);
$thisInfo['flags']['extra'] = (bool) ($thisInfo['raw']['flags'] & 0x04);
$thisInfo['flags']['filename'] = (bool) ($thisInfo['raw']['flags'] & 0x08);
$thisInfo['flags']['comment'] = (bool) ($thisInfo['raw']['flags'] & 0x10);
$thisInfo['compression'] = $this->get_xflag_type($thisInfo['raw']['xflags']);
$thisInfo['os'] = $this->get_os_type($thisInfo['raw']['os']);
if (!$thisInfo['os']) {
$this->error('Read error on gzip file');
return false;
}
$fpointer = 10;
$arr_xsubfield = array();
// bit 2 - FLG.FEXTRA
//+---+---+=================================+
//| XLEN |...XLEN bytes of "extra field"...|
//+---+---+=================================+
if ($thisInfo['flags']['extra']) {
$w_xlen = substr($buff, $fpointer, 2);
$xlen = getid3_lib::LittleEndian2Int($w_xlen);
$fpointer += 2;
$thisInfo['raw']['xfield'] = substr($buff, $fpointer, $xlen);
// Extra SubFields
//+---+---+---+---+==================================+
//|SI1|SI2| LEN |... LEN bytes of subfield data ...|
//+---+---+---+---+==================================+
$idx = 0;
while (true) {
if ($idx >= $xlen) {
break;
}
$si1 = ord(substr($buff, $fpointer + $idx++, 1));
$si2 = ord(substr($buff, $fpointer + $idx++, 1));
if (($si1 == 0x41) && ($si2 == 0x70)) {
$w_xsublen = substr($buff, $fpointer + $idx, 2);
$xsublen = getid3_lib::LittleEndian2Int($w_xsublen);
$idx += 2;
$arr_xsubfield[] = substr($buff, $fpointer + $idx, $xsublen);
$idx += $xsublen;
} else {
break;
}
}
$fpointer += $xlen;
}
// bit 3 - FLG.FNAME
//+=========================================+
//|...original file name, zero-terminated...|
//+=========================================+
// GZIP files may have only one file, with no filename, so assume original filename is current filename without .gz
$thisInfo['filename'] = preg_replace('#\\.gz$#i', '', $info['filename']);
if ($thisInfo['flags']['filename']) {
$thisInfo['filename'] = '';
while (true) {
if (ord($buff[$fpointer]) == 0) {
$fpointer++;
break;
}
$thisInfo['filename'] .= $buff[$fpointer];
$fpointer++;
}
}
// bit 4 - FLG.FCOMMENT
//+===================================+
//|...file comment, zero-terminated...|
//+===================================+
if ($thisInfo['flags']['comment']) {
while (true) {
if (ord($buff[$fpointer]) == 0) {
$fpointer++;
break;
}
$thisInfo['comment'] .= $buff[$fpointer];
$fpointer++;
}
}
// bit 1 - FLG.FHCRC
//+---+---+
//| CRC16 |
//+---+---+
if ($thisInfo['flags']['crc16']) {
$w_crc = substr($buff, $fpointer, 2);
$thisInfo['crc16'] = getid3_lib::LittleEndian2Int($w_crc);
$fpointer += 2;
}
// bit 0 - FLG.FTEXT
//if ($thisInfo['raw']['flags'] & 0x01) {
// Ignored...
//}
// bits 5, 6, 7 - reserved
$thisInfo['crc32'] = getid3_lib::LittleEndian2Int(substr($buff, strlen($buff) - 8, 4));
$thisInfo['filesize'] = getid3_lib::LittleEndian2Int(substr($buff, strlen($buff) - 4));
$info['gzip']['files'] = getid3_lib::array_merge_clobber($info['gzip']['files'], getid3_lib::CreateDeepArray($thisInfo['filename'], '/', $thisInfo['filesize']));
if ($this->option_gzip_parse_contents) {
// Try to inflate GZip
$csize = 0;
$inflated = '';
$chkcrc32 = '';
if (function_exists('gzinflate')) {
$cdata = substr($buff, $fpointer);
$cdata = substr($cdata, 0, strlen($cdata) - 8);
$csize = strlen($cdata);
$inflated = gzinflate($cdata);
// Calculate CRC32 for inflated content
$thisInfo['crc32_valid'] = sprintf('%u', crc32($inflated)) == $thisInfo['crc32'];
// determine format
$formattest = substr($inflated, 0, 32774);
$getid3_temp = new getID3();
$determined_format = $getid3_temp->GetFileFormat($formattest);
unset($getid3_temp);
// file format is determined
$determined_format['module'] = (isset($determined_format['module']) ? $determined_format['module'] : '');
switch ($determined_format['module']) {
case 'tar':
// view TAR-file info
if (file_exists(GETID3_INCLUDEPATH.$determined_format['include']) && include_once(GETID3_INCLUDEPATH.$determined_format['include'])) {
if (($temp_tar_filename = tempnam(GETID3_TEMP_DIR, 'getID3')) === false) {
// can't find anywhere to create a temp file, abort
$this->error('Unable to create temp file to parse TAR inside GZIP file');
break;
}
if ($fp_temp_tar = fopen($temp_tar_filename, 'w+b')) {
fwrite($fp_temp_tar, $inflated);
fclose($fp_temp_tar);
$getid3_temp = new getID3();
$getid3_temp->openfile($temp_tar_filename);
$getid3_tar = new getid3_tar($getid3_temp);
$getid3_tar->Analyze();
$info['gzip']['member_header'][$idx]['tar'] = $getid3_temp->info['tar'];
unset($getid3_temp, $getid3_tar);
unlink($temp_tar_filename);
} else {
$this->error('Unable to fopen() temp file to parse TAR inside GZIP file');
break;
}
}
break;
case '':
default:
// unknown or unhandled format
break;
}
} else {
$this->warning('PHP is not compiled with gzinflate() support. Please enable PHP Zlib extension or recompile with the --with-zlib switch');
}
}
}
return true;
}
/**
* Converts the OS type.
*
* @param string $key
*
* @return string
*/
public function get_os_type($key) {
static $os_type = array(
'0' => 'FAT filesystem (MS-DOS, OS/2, NT/Win32)',
'1' => 'Amiga',
'2' => 'VMS (or OpenVMS)',
'3' => 'Unix',
'4' => 'VM/CMS',
'5' => 'Atari TOS',
'6' => 'HPFS filesystem (OS/2, NT)',
'7' => 'Macintosh',
'8' => 'Z-System',
'9' => 'CP/M',
'10' => 'TOPS-20',
'11' => 'NTFS filesystem (NT)',
'12' => 'QDOS',
'13' => 'Acorn RISCOS',
'255' => 'unknown'
);
return (isset($os_type[$key]) ? $os_type[$key] : '');
}
/**
* Converts the eXtra FLags.
*
* @param string $key
*
* @return string
*/
public function get_xflag_type($key) {
static $xflag_type = array(
'0' => 'unknown',
'2' => 'maximum compression',
'4' => 'fastest algorithm'
);
return (isset($xflag_type[$key]) ? $xflag_type[$key] : '');
}
}