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Description

Usage

$array|bool = getID3::getHashdata( $algorithm );

Parameters

$algorithm

( string ) required –

Returns

array|bool

Source

File name: wordpress/wp-includes/ID3/getid3.php
Lines:

  public function getHashdata($algorithm) {
    switch ($algorithm) {
      case 'md5':
      case 'sha1':
        break;

      default:
        return $this->getID3::error('bad algorithm "'.$algorithm.'" in getHashdata()');
    }

    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.

      // phpcs:ignore PHPCompatibility.IniDirectives.RemovedIniDirectives.safe_modeDeprecatedRemoved
      if (preg_match('#(1|ON)#i', ini_get('safe_mode'))) {

        $this->getID3::warning('Failed making system call to vorbiscomment.exe - '.$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
        $empty = tempnam(GETID3_TEMP_DIR, 'getID3');
        touch($empty);

        // Use vorbiscomment to make temp file without comments
        $temp = tempnam(GETID3_TEMP_DIR, 'getID3');
        $file = $this->info['filenamepath'];

        if (GETID3_OS_ISWINDOWS) {

          if (file_exists(GETID3_HELPERAPPSDIR.'vorbiscomment.exe')) {

            $commandline = '"'.GETID3_HELPERAPPSDIR.'vorbiscomment.exe" -w -c "'.$empty.'" "'.$file.'" "'.$temp.'"';
            $VorbisCommentError = `$commandline`;

          } else {

            $VorbisCommentError = 'vorbiscomment.exe not found in '.GETID3_HELPERAPPSDIR;

          }

        } else {

          $commandline = 'vorbiscomment -w -c '.escapeshellarg($empty).' '.escapeshellarg($file).' '.escapeshellarg($temp).' 2>&1';
          $VorbisCommentError = `$commandline`;

        }

        if (!empty($VorbisCommentError)) {

          $this->getID3::warning('Failed making system call to vorbiscomment(.exe) - '.$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']))) {
 

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