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