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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