function crc32(_array, _prefix, _postfix) {
  // calculate the crc32 checksum
  return (function(_crcTable, _prefix, _initial, _postfix, _output) {
    var _crc,
      _byte,
      _counter,
      _result,
      _temp,
      _tableIndex = -1,
      _crcTable = [],
      _outputTable = [0, null],
      _intermediate = null,
      _crcChain = [_prefix]
    for (
      _byte = Math.min(_prefix.length, _initial), _counter = 0;
      _counter < _byte;
      ++_counter
    )
      _crcChain.push(_prefix[_counter])
    _crcChain.p = _postfix
    for (var _tempChain = []; ;) {
      // we'll look at what's in here in a minute
    }
  })(_crcTable, [], 0, _prefix, _postfix)
}