decode method

Uint8List decode(DVAssetEncoding encoding, Uint8List stored, int size)

stored, encoded with encoding, decoded to its size bytes.

Throws FormatException for a stream that is not valid or does not decode to exactly size bytes.

Implementation

Uint8List decode(DVAssetEncoding encoding, Uint8List stored, int size) {
  final int codec = _codecFor(encoding);
  final ffi.Pointer<ffi.Uint8> input = pkgffi.malloc<ffi.Uint8>(stored.isEmpty ? 1 : stored.length);
  final ffi.Pointer<ffi.Uint8> output = pkgffi.malloc<ffi.Uint8>(size == 0 ? 1 : size);
  try {
    input.asTypedList(stored.length).setAll(0, stored);
    final int written = _decode(codec, input, stored.length, output, size);
    if (written != size) {
      throw FormatException('not a ${encoding.token} stream of $size bytes ($written)');
    }
    return Uint8List.fromList(output.asTypedList(size));
  } finally {
    pkgffi.malloc.free(input);
    pkgffi.malloc.free(output);
  }
}