public function parseWavPackHeader($WavPackChunkData) {
    // typedef struct {
    //     char ckID [4];
    //     long ckSize;
    //     short version;
    //     short bits;                // added for version 2.00
    //     short flags, shift;        // added for version 3.00
    //     long total_samples, crc, crc2;
    //     char extension [4], extra_bc, extras [3];
    // } WavpackHeader;

    // shortcut
    $info = &$this->getid3->info;
    $info['wavpack']  = array();
    $thisfile_wavpack = &$info['wavpack'];

    $thisfile_wavpack['version']           = getid3_lib::LittleEndian2Int(substr($WavPackChunkData,  0, 2));
    if ($thisfile_wavpack['version'] >= 2) {
      $thisfile_wavpack['bits']          = getid3_lib::LittleEndian2Int(substr($WavPackChunkData,  2, 2));
    }
    if ($thisfile_wavpack['version'] >= 3) {
      $thisfile_wavpack['flags_raw']     = getid3_lib::LittleEndian2Int(substr($WavPackChunkData,  4, 2));
      $thisfile_wavpack['shift']         = getid3_lib::LittleEndian2Int(substr($WavPackChunkData,  6, 2));
      $thisfile_wavpack['total_samples'] = getid3_lib::LittleEndian2Int(substr($WavPackChunkData,  8, 4));
      $thisfile_wavpack['crc1']          = getid3_lib::LittleEndian2Int(substr($WavPackChunkData, 12, 4));
      $thisfile_wavpack['crc2']          = getid3_lib::LittleEndian2Int(substr($WavPackChunkData, 16, 4));
      $thisfile_wavpack['extension']     =                              substr($WavPackChunkData, 20, 4);
      $thisfile_wavpack['extra_bc']      = getid3_lib::LittleEndian2Int(substr($WavPackChunkData, 24, 1));
      for ($i = 0; $i <= 2; $i++) {
        $thisfile_wavpack['extras'][]  = getid3_lib::LittleEndian2Int(substr($WavPackChunkData, 25 + $i, 1));
      }

      // shortcut
      $thisfile_wavpack['flags'] = array();
      $thisfile_wavpack_flags = &$thisfile_wavpack['flags'];

      $thisfile_wavpack_flags['mono']                 = (bool) ($thisfile_wavpack['flags_raw'] & 0x000001);
      $thisfile_wavpack_flags['fast_mode']            = (bool) ($thisfile_wavpack['flags_raw'] & 0x000002);
      $thisfile_wavpack_flags['raw_mode']             = (bool) ($thisfile_wavpack['flags_raw'] & 0x000004);
      $thisfile_wavpack_flags['calc_noise']           = (bool) ($thisfile_wavpack['flags_raw'] & 0x000008);
      $thisfile_wavpack_flags['high_quality']         = (bool) ($thisfile_wavpack['flags_raw'] & 0x000010);
      $thisfile_wavpack_flags['3_byte_samples']       = (bool) ($thisfile_wavpack['flags_raw'] & 0x000020);
      $thisfile_wavpack_flags['over_20_bits']         = (bool) ($thisfile_wavpack['flags_raw'] & 0x000040);
      $thisfile_wavpack_flags['use_wvc']              = (bool) ($thisfile_wavpack['flags_raw'] & 0x000080);
      $thisfile_wavpack_flags['noiseshaping']         = (bool) ($thisfile_wavpack['flags_raw'] & 0x000100);
      $thisfile_wavpack_flags['very_fast_mode']       = (bool) ($thisfile_wavpack['flags_raw'] & 0x000200);
      $thisfile_wavpack_flags['new_high_quality']     = (bool) ($thisfile_wavpack['flags_raw'] & 0x000400);
      $thisfile_wavpack_flags['cancel_extreme']       = (bool) ($thisfile_wavpack['flags_raw'] & 0x000800);
      $thisfile_wavpack_flags['cross_decorrelation']  = (bool) ($thisfile_wavpack['flags_raw'] & 0x001000);
      $thisfile_wavpack_flags['new_decorrelation']    = (bool) ($thisfile_wavpack['flags_raw'] & 0x002000);
      $thisfile_wavpack_flags['joint_stereo']         = (bool) ($thisfile_wavpack['flags_raw'] & 0x004000);
      $thisfile_wavpack_flags['extra_decorrelation']  = (bool) ($thisfile_wavpack['flags_raw'] & 0x008000);
      $thisfile_wavpack_flags['override_noiseshape']  = (bool) ($thisfile_wavpack['flags_raw'] & 0x010000);
      $thisfile_wavpack_flags['override_jointstereo'] = (bool) ($thisfile_wavpack['flags_raw'] & 0x020000);
      $thisfile_wavpack_flags['copy_source_filetime'] = (bool) ($thisfile_wavpack['flags_raw'] & 0x040000);
      $thisfile_wavpack_flags['create_exe']           = (bool) ($thisfile_wavpack['flags_raw'] & 0x080000);
    }

    return true;
  }