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Diffstat (limited to 'modules/getid3/module.lib.data_hash.php')
| -rw-r--r-- | modules/getid3/module.lib.data_hash.php | 196 |
1 files changed, 196 insertions, 0 deletions
diff --git a/modules/getid3/module.lib.data_hash.php b/modules/getid3/module.lib.data_hash.php new file mode 100644 index 00000000..1ede53fa --- /dev/null +++ b/modules/getid3/module.lib.data_hash.php @@ -0,0 +1,196 @@ +<?php +// +----------------------------------------------------------------------+ +// | PHP version 5 | +// +----------------------------------------------------------------------+ +// | Copyright (c) 2002-2006 James Heinrich, Allan Hansen | +// +----------------------------------------------------------------------+ +// | This source file is subject to version 2 of the GPL license, | +// | that is bundled with this package in the file license.txt and is | +// | available through the world-wide-web at the following url: | +// | http://www.gnu.org/copyleft/gpl.html | +// +----------------------------------------------------------------------+ +// | getID3() - http://getid3.sourceforge.net or http://www.getid3.org | +// +----------------------------------------------------------------------+ +// | Authors: James Heinrich <infoØgetid3*org> | +// | Allan Hansen <ahØartemis*dk> | +// +----------------------------------------------------------------------+ +// | module.lib.data-hash.php | +// | getID3() library file. | +// | dependencies: NONE. | +// +----------------------------------------------------------------------+ +// +// $Id: module.lib.data_hash.php,v 1.5 2006/12/03 19:28:18 ah Exp $ + + + +class getid3_lib_data_hash +{ + + private $getid3; + + + // constructer - calculate md5/sha1 data + public function __construct(getID3 $getid3, $algorithm) { + + $this->getid3 = $getid3; + + // Check algorithm + if (!preg_match('/^(md5|sha1)$/', $algorithm)) { + throw new getid3_exception('Unsupported algorithm, "'.$algorithm.'", in GetHashdata()'); + } + + + //// Handle ogg vorbis files + + if ((@$getid3->info['fileformat'] == 'ogg') && (@$getid3->info['audio']['dataformat'] == 'vorbis')) { + + // We cannot get an identical md5_data value for Ogg files where the comments + // span more than 1 Ogg page (compared to the same audio data with smaller + // comments) using the normal getID3() method of MD5'ing the data between the + // end of the comments and the end of the file (minus any trailing tags), + // because the page sequence numbers of the pages that the audio data is on + // do not match. Under normal circumstances, where comments are smaller than + // the nominal 4-8kB page size, then this is not a problem, but if there are + // very large comments, the only way around it is to strip off the comment + // tags with vorbiscomment and MD5 that file. + // This procedure must be applied to ALL Ogg files, not just the ones with + // comments larger than 1 page, because the below method simply MD5's the + // whole file with the comments stripped, not just the portion after the + // comments block (which is the standard getID3() method. + + // The above-mentioned problem of comments spanning multiple pages and changing + // page sequence numbers likely happens for OggSpeex and OggFLAC as well, but + // currently vorbiscomment only works on OggVorbis files. + + if ((bool)ini_get('safe_mode')) { + throw new getid3_exception('PHP running in Safe Mode - cannot make system call to vorbiscomment[.exe] needed for '.$algorithm.'_data.'); + } + + if (!preg_match('/^Vorbiscomment /', `vorbiscomment --version 2>&1`)) { + throw new getid3_exception('vorbiscomment[.exe] binary not found in path. UNIX: typically /usr/bin. Windows: typically c:\windows\system32.'); + } + + // Prevent user from aborting script + $old_abort = ignore_user_abort(true); + + // Create empty file + $empty = tempnam('*', 'getID3'); + touch($empty); + + // Use vorbiscomment to make temp file without comments + $temp = tempnam('*', 'getID3'); + + $command_line = 'vorbiscomment -w -c '.escapeshellarg($empty).' '.escapeshellarg(realpath($getid3->filename)).' '.escapeshellarg($temp).' 2>&1'; + + // Error from vorbiscomment + if ($vorbis_comment_error = `$command_line`) { + throw new getid3_exception('System call to vorbiscomment[.exe] failed.'); + } + + // Get hash of newly created file + $hash_function = $algorithm . '_file'; + $getid3->info[$algorithm.'_data'] = $hash_function($temp); + + // Clean up + unlink($empty); + unlink($temp); + + // Reset abort setting + ignore_user_abort($old_abort); + + // Return success + return true; + } + + //// Handle other file formats + + // Get hash from part of file + if (@$getid3->info['avdataoffset'] || (@$getid3->info['avdataend'] && @$getid3->info['avdataend'] < $getid3->info['filesize'])) { + + if ((bool)ini_get('safe_mode')) { + $getid3->warning('PHP running in Safe Mode - backtick operator not available, using slower non-system-call '.$algorithm.' algorithm.'); + $hash_function = 'hash_file_partial_safe_mode'; + } + else { + $hash_function = 'hash_file_partial'; + } + + $getid3->info[$algorithm.'_data'] = $this->$hash_function($getid3->filename, $getid3->info['avdataoffset'], $getid3->info['avdataend'], $algorithm); + } + + // Get hash from whole file - use built-in md5_file() and sha1_file() + else { + $hash_function = $algorithm . '_file'; + $getid3->info[$algorithm.'_data'] = $hash_function($getid3->filename); + } + } + + + + // Return md5/sha1sum for a file from starting position to absolute end position + // Using windows system call + private function hash_file_partial($file, $offset, $end, $algorithm) { + + // It seems that sha1sum.exe for Windows only works on physical files, does not accept piped data + // Fall back to create-temp-file method: + if ($algorithm == 'sha1' && strtoupper(substr(PHP_OS, 0, 3)) == 'WIN') { + return $this->hash_file_partial_safe_mode($file, $offset, $end, $algorithm); + } + + // Check for presence of binaries and revert to safe mode if not found + if (!`head --version`) { + return $this->hash_file_partial_safe_mode($file, $offset, $end, $algorithm); + } + + if (!`tail --version`) { + return $this->hash_file_partial_safe_mode($file, $offset, $end, $algorithm); + } + + if (!`${algorithm}sum --version`) { + return $this->hash_file_partial_safe_mode($file, $offset, $end, $algorithm); + } + + $size = $end - $offset; + $command_line = 'head -c'.$end.' '.escapeshellarg(realpath($file)).' | tail -c'.$size.' | '.$algorithm.'sum'; + return substr(`$command_line`, 0, $algorithm == 'md5' ? 32 : 40); + } + + + + // Return md5/sha1sum for a file from starting position to absolute end position + // Using slow safe_mode temp file + private function hash_file_partial_safe_mode($file, $offset, $end, $algorithm) { + + // Attempt to create a temporary file in the system temp directory - invalid dirname should force to system temp dir + if (($data_filename = tempnam('*', 'getID3')) === false) { + throw new getid3_exception('Unable to create temporary file.'); + } + + // Init + $result = false; + + // Copy parts of file + if ($fp = @fopen($file, 'rb')) { + + if ($fp_data = @fopen($data_filename, 'wb')) { + + fseek($fp, $offset, SEEK_SET); + $bytes_left_to_write = $end - $offset; + while (($bytes_left_to_write > 0) && ($buffer = fread($fp, getid3::FREAD_BUFFER_SIZE))) { + $bytes_written = fwrite($fp_data, $buffer, $bytes_left_to_write); + $bytes_left_to_write -= $bytes_written; + } + fclose($fp_data); + $hash_function = $algorithm . '_file'; + $result = $hash_function($data_filename); + + } + fclose($fp); + } + unlink($data_filename); + return $result; + } + +} + +?>
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