[3318] | 1 | <?php |
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| 2 | // +----------------------------------------------------------------------+ |
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| 3 | // | PHP version 5 | |
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| 4 | // +----------------------------------------------------------------------+ |
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| 5 | // | Copyright (c) 2002-2006 James Heinrich, Allan Hansen | |
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| 6 | // +----------------------------------------------------------------------+ |
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| 7 | // | This source file is subject to version 2 of the GPL license, | |
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| 8 | // | that is bundled with this package in the file license.txt and is | |
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| 9 | // | available through the world-wide-web at the following url: | |
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| 10 | // | http://www.gnu.org/copyleft/gpl.html | |
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| 11 | // +----------------------------------------------------------------------+ |
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| 12 | // | getID3() - http://getid3.sourceforge.net or http://www.getid3.org | |
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| 13 | // +----------------------------------------------------------------------+ |
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| 14 | // | Authors: James Heinrich <infoØgetid3*org> | |
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| 15 | // | Allan Hansen <ahØartemis*dk> | |
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| 16 | // +----------------------------------------------------------------------+ |
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| 17 | // | module.lib.data-hash.php | |
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| 18 | // | getID3() library file. | |
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| 19 | // | dependencies: NONE. | |
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| 20 | // +----------------------------------------------------------------------+ |
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| 21 | // |
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| 22 | // $Id: module.lib.data_hash.php 3318 2009-05-20 21:54:10Z vdigital $ |
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| 23 | |
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| 24 | |
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| 25 | |
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| 26 | class getid3_lib_data_hash |
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| 27 | { |
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| 28 | |
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| 29 | private $getid3; |
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| 30 | |
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| 31 | |
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| 32 | // constructer - calculate md5/sha1 data |
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| 33 | public function __construct(getID3 $getid3, $algorithm) { |
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| 34 | |
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| 35 | $this->getid3 = $getid3; |
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| 36 | |
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| 37 | // Check algorithm |
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| 38 | if (!preg_match('/^(md5|sha1)$/', $algorithm)) { |
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| 39 | throw new getid3_exception('Unsupported algorithm, "'.$algorithm.'", in GetHashdata()'); |
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| 40 | } |
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| 41 | |
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| 42 | |
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| 43 | //// Handle ogg vorbis files |
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| 44 | |
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| 45 | if ((@$getid3->info['fileformat'] == 'ogg') && (@$getid3->info['audio']['dataformat'] == 'vorbis')) { |
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| 46 | |
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| 47 | // We cannot get an identical md5_data value for Ogg files where the comments |
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| 48 | // span more than 1 Ogg page (compared to the same audio data with smaller |
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| 49 | // comments) using the normal getID3() method of MD5'ing the data between the |
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| 50 | // end of the comments and the end of the file (minus any trailing tags), |
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| 51 | // because the page sequence numbers of the pages that the audio data is on |
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| 52 | // do not match. Under normal circumstances, where comments are smaller than |
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| 53 | // the nominal 4-8kB page size, then this is not a problem, but if there are |
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| 54 | // very large comments, the only way around it is to strip off the comment |
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| 55 | // tags with vorbiscomment and MD5 that file. |
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| 56 | // This procedure must be applied to ALL Ogg files, not just the ones with |
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| 57 | // comments larger than 1 page, because the below method simply MD5's the |
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| 58 | // whole file with the comments stripped, not just the portion after the |
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| 59 | // comments block (which is the standard getID3() method. |
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| 60 | |
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| 61 | // The above-mentioned problem of comments spanning multiple pages and changing |
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| 62 | // page sequence numbers likely happens for OggSpeex and OggFLAC as well, but |
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| 63 | // currently vorbiscomment only works on OggVorbis files. |
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| 64 | |
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| 65 | if ((bool)ini_get('safe_mode')) { |
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| 66 | throw new getid3_exception('PHP running in Safe Mode - cannot make system call to vorbiscomment[.exe] needed for '.$algorithm.'_data.'); |
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| 67 | } |
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| 68 | |
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| 69 | if (!preg_match('/^Vorbiscomment /', `vorbiscomment --version 2>&1`)) { |
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| 70 | throw new getid3_exception('vorbiscomment[.exe] binary not found in path. UNIX: typically /usr/bin. Windows: typically c:\windows\system32.'); |
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| 71 | } |
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| 72 | |
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| 73 | // Prevent user from aborting script |
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| 74 | $old_abort = ignore_user_abort(true); |
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| 75 | |
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| 76 | // Create empty file |
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| 77 | $empty = tempnam('*', 'getID3'); |
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| 78 | touch($empty); |
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| 79 | |
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| 80 | // Use vorbiscomment to make temp file without comments |
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| 81 | $temp = tempnam('*', 'getID3'); |
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| 82 | |
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| 83 | $command_line = 'vorbiscomment -w -c '.escapeshellarg($empty).' '.escapeshellarg(realpath($getid3->filename)).' '.escapeshellarg($temp).' 2>&1'; |
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| 84 | |
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| 85 | // Error from vorbiscomment |
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| 86 | if ($vorbis_comment_error = `$command_line`) { |
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| 87 | throw new getid3_exception('System call to vorbiscomment[.exe] failed.'); |
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| 88 | } |
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| 89 | |
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| 90 | // Get hash of newly created file |
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| 91 | $hash_function = $algorithm . '_file'; |
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| 92 | $getid3->info[$algorithm.'_data'] = $hash_function($temp); |
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| 93 | |
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| 94 | // Clean up |
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| 95 | unlink($empty); |
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| 96 | unlink($temp); |
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| 97 | |
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| 98 | // Reset abort setting |
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| 99 | ignore_user_abort($old_abort); |
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| 100 | |
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| 101 | // Return success |
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| 102 | return true; |
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| 103 | } |
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| 104 | |
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| 105 | //// Handle other file formats |
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| 106 | |
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| 107 | // Get hash from part of file |
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| 108 | if (@$getid3->info['avdataoffset'] || (@$getid3->info['avdataend'] && @$getid3->info['avdataend'] < $getid3->info['filesize'])) { |
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| 109 | |
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| 110 | if ((bool)ini_get('safe_mode')) { |
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| 111 | $getid3->warning('PHP running in Safe Mode - backtick operator not available, using slower non-system-call '.$algorithm.' algorithm.'); |
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| 112 | $hash_function = 'hash_file_partial_safe_mode'; |
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| 113 | } |
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| 114 | else { |
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| 115 | $hash_function = 'hash_file_partial'; |
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| 116 | } |
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| 117 | |
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| 118 | $getid3->info[$algorithm.'_data'] = $this->$hash_function($getid3->filename, $getid3->info['avdataoffset'], $getid3->info['avdataend'], $algorithm); |
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| 119 | } |
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| 120 | |
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| 121 | // Get hash from whole file - use built-in md5_file() and sha1_file() |
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| 122 | else { |
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| 123 | $hash_function = $algorithm . '_file'; |
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| 124 | $getid3->info[$algorithm.'_data'] = $hash_function($getid3->filename); |
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| 125 | } |
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| 126 | } |
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| 127 | |
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| 128 | |
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| 129 | |
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| 130 | // Return md5/sha1sum for a file from starting position to absolute end position |
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| 131 | // Using windows system call |
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| 132 | private function hash_file_partial($file, $offset, $end, $algorithm) { |
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| 133 | |
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| 134 | // It seems that sha1sum.exe for Windows only works on physical files, does not accept piped data |
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| 135 | // Fall back to create-temp-file method: |
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| 136 | if ($algorithm == 'sha1' && strtoupper(substr(PHP_OS, 0, 3)) == 'WIN') { |
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| 137 | return $this->hash_file_partial_safe_mode($file, $offset, $end, $algorithm); |
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| 138 | } |
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| 139 | |
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| 140 | // Check for presence of binaries and revert to safe mode if not found |
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| 141 | if (!`head --version`) { |
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| 142 | return $this->hash_file_partial_safe_mode($file, $offset, $end, $algorithm); |
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| 143 | } |
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| 144 | |
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| 145 | if (!`tail --version`) { |
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| 146 | return $this->hash_file_partial_safe_mode($file, $offset, $end, $algorithm); |
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| 147 | } |
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| 148 | |
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| 149 | if (!`${algorithm}sum --version`) { |
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| 150 | return $this->hash_file_partial_safe_mode($file, $offset, $end, $algorithm); |
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| 151 | } |
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| 152 | |
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| 153 | $size = $end - $offset; |
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| 154 | $command_line = 'head -c'.$end.' '.escapeshellarg(realpath($file)).' | tail -c'.$size.' | '.$algorithm.'sum'; |
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| 155 | return substr(`$command_line`, 0, $algorithm == 'md5' ? 32 : 40); |
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| 156 | } |
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| 157 | |
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| 158 | |
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| 159 | |
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| 160 | // Return md5/sha1sum for a file from starting position to absolute end position |
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| 161 | // Using slow safe_mode temp file |
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| 162 | private function hash_file_partial_safe_mode($file, $offset, $end, $algorithm) { |
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| 163 | |
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| 164 | // Attempt to create a temporary file in the system temp directory - invalid dirname should force to system temp dir |
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| 165 | if (($data_filename = tempnam('*', 'getID3')) === false) { |
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| 166 | throw new getid3_exception('Unable to create temporary file.'); |
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| 167 | } |
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| 168 | |
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| 169 | // Init |
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| 170 | $result = false; |
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| 171 | |
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| 172 | // Copy parts of file |
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| 173 | if ($fp = @fopen($file, 'rb')) { |
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| 174 | |
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| 175 | if ($fp_data = @fopen($data_filename, 'wb')) { |
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| 176 | |
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| 177 | fseek($fp, $offset, SEEK_SET); |
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| 178 | $bytes_left_to_write = $end - $offset; |
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| 179 | while (($bytes_left_to_write > 0) && ($buffer = fread($fp, getid3::FREAD_BUFFER_SIZE))) { |
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| 180 | $bytes_written = fwrite($fp_data, $buffer, $bytes_left_to_write); |
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| 181 | $bytes_left_to_write -= $bytes_written; |
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| 182 | } |
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| 183 | fclose($fp_data); |
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| 184 | $hash_function = $algorithm . '_file'; |
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| 185 | $result = $hash_function($data_filename); |
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| 186 | |
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| 187 | } |
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| 188 | fclose($fp); |
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| 189 | } |
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| 190 | unlink($data_filename); |
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| 191 | return $result; |
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| 192 | } |
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| 193 | |
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| 194 | } |
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| 195 | |
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| 196 | ?> |
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