--- /dev/null
+<?php
+/////////////////////////////////////////////////////////////////
+/// getID3() by James Heinrich <info@getid3.org> //
+// available at http://getid3.sourceforge.net //
+// or http://www.getid3.org //
+// also https://github.com/JamesHeinrich/getID3 //
+/////////////////////////////////////////////////////////////////
+// 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> //
+// //
+/////////////////////////////////////////////////////////////////
+
+
+class getid3_gzip extends getid3_handler {
+
+ // public: Optional file list - disable for speed.
+ public $option_gzip_parse_contents = false; // decode gzipped files, if possible, and parse recursively (.tar.gz for example)
+
+ 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);
+ 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
+ $thisInfo['crc32_valid'] = (bool) (sprintf('%u', crc32($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 {
+ $this->error('Unable to fopen() temp file to parse TAR inside GZIP file');
+ break;
+ }
+ }
+ break;
+
+ case '':
+ default:
+ // unknown or unhandled format
+ break;
+ }
+ }
+ }
+ }
+ return true;
+ }
+
+ // Converts the OS type
+ public function get_os_type($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
+ 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] : '');
+ }
+}
+
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