/**
*
* @param type $algorithm
* @return boolean
*/
public function getHashdata($algorithm)
{
switch ($algorithm) {
case 'md5':
case 'sha1':
break;
default:
return $this->error('bad algorithm "' . $algorithm . '" in getHashdata()');
break;
}
if (!empty($this->info['fileformat']) && !empty($this->info['dataformat']) && $this->info['fileformat'] == 'ogg' && $this->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 (preg_match('#(1|ON)#i', ini_get('safe_mode'))) {
$this->warning('Failed making system call to vorbiscomment.exe - ' . $algorithm . '_data is incorrect - error returned: PHP running in Safe Mode (backtick operator not available)');
$this->info[$algorithm . '_data'] = false;
} else {
// Prevent user from aborting script
$old_abort = ignore_user_abort(true);
// Create empty file
$empty = tempnam(self::getTempDir(), 'getID3');
touch($empty);
// Use vorbiscomment to make temp file without comments
$temp = tempnam(self::getTempDir(), 'getID3');
$file = $this->info['filenamepath'];
if (self::$EnvironmentIsWindows) {
if (file_exists(self::getHelperAppsDir() . 'vorbiscomment.exe')) {
$commandline = '"' . self::getHelperAppsDir() . 'vorbiscomment.exe" -w -c "' . $empty . '" "' . $file . '" "' . $temp . '"';
$VorbisCommentError = `{$commandline}`;
} else {
$VorbisCommentError = 'vorbiscomment.exe not found in ' . self::getHelperAppsDir();
}
} else {
$commandline = 'vorbiscomment -w -c "' . $empty . '" "' . $file . '" "' . $temp . '" 2>&1';
$commandline = 'vorbiscomment -w -c ' . escapeshellarg($empty) . ' ' . escapeshellarg($file) . ' ' . escapeshellarg($temp) . ' 2>&1';
$VorbisCommentError = `{$commandline}`;
}
if (!empty($VorbisCommentError)) {
$this->info['warning'][] = 'Failed making system call to vorbiscomment(.exe) - ' . $algorithm . '_data will be incorrect. If vorbiscomment is unavailable, please download from http://www.vorbis.com/download.psp and put in the GetId3() directory. Error returned: ' . $VorbisCommentError;
$this->info[$algorithm . '_data'] = false;
} else {
// Get hash of newly created file
switch ($algorithm) {
case 'md5':
$this->info[$algorithm . '_data'] = md5_file($temp);
break;
case 'sha1':
$this->info[$algorithm . '_data'] = sha1_file($temp);
break;
}
}
// Clean up
unlink($empty);
unlink($temp);
// Reset abort setting
ignore_user_abort($old_abort);
}
} else {
if (!empty($this->info['avdataoffset']) || isset($this->info['avdataend']) && $this->info['avdataend'] < $this->info['filesize']) {
// get hash from part of file
$this->info[$algorithm . '_data'] = GetId3_Lib_Helper::hash_data($this->info['filenamepath'], $this->info['avdataoffset'], $this->info['avdataend'], $algorithm);
} else {
// get hash from whole file
switch ($algorithm) {
case 'md5':
$this->info[$algorithm . '_data'] = md5_file($this->info['filenamepath']);
break;
case 'sha1':
$this->info[$algorithm . '_data'] = sha1_file($this->info['filenamepath']);
break;
}
}
}
return true;
}
