public static void Pack(Stream inputStream, Stream outputStream, GcGame game)
{
if (inputStream == null)
{
throw new ArgumentNullException("inputStream");
}
if (outputStream == null)
{
throw new ArgumentNullException("outputStream");
}
if (!Enum.IsDefined(typeof(GcGame), game))
{
throw new ArgumentOutOfRangeException("game");
}
// Read the input data and compress with LZSS
byte[] uncompressedData = StreamUtil.ReadFully(inputStream);
LzssEncoder encoder = new LzssEncoder();
byte[] compressedData = encoder.Encode(uncompressedData);
// Write file header and data
int headerSizeField = compressedData.Length;
if (LzVersionDetails.IsHeaderIncludedInCompressedSizeField(game))
{
headerSizeField += 8; // SMB1/SMB2 counts the 8 bytes of header in the compressed size field
}
EndianBinaryWriter outputBinaryWriter = new EndianBinaryWriter(EndianBitConverter.Little, outputStream);
outputBinaryWriter.Write(headerSizeField);
outputBinaryWriter.Write(uncompressedData.Length);
outputBinaryWriter.Write(compressedData);
}
public static void Unpack(Stream inputStream, Stream outputStream, GcGame game)
{
if (inputStream == null)
{
throw new ArgumentNullException("inputStream");
}
if (outputStream == null)
{
throw new ArgumentNullException("outputStream");
}
if (!Enum.IsDefined(typeof(GcGame), game))
{
throw new ArgumentOutOfRangeException("game");
}
EndianBinaryReader inputBinaryStream = new EndianBinaryReader(EndianBitConverter.Little, inputStream);
// Read file header
int headerSizeField = inputBinaryStream.ReadInt32();
int uncompressedSize = inputBinaryStream.ReadInt32();
int compressedSize = headerSizeField;
if (LzVersionDetails.IsHeaderIncludedInCompressedSizeField(game))
{
compressedSize -= 8; // SMB1/SMB2 counts the 8 bytes of header in the compressed size field
}
// Check that the size of the input matches the expected value
if (compressedSize + 8 != inputStream.Length)
{
throw new InvalidLzFileException("Invalid .lz file, inputSize does not match actual input size.");
}
// Read and uncompress LZSS data
byte[] compressedData = inputBinaryStream.ReadBytesOrThrow(compressedSize);
LzssDecoder decoder = new LzssDecoder();
byte[] uncompressedData = decoder.Decode(compressedData);
if (uncompressedData.Length != uncompressedSize)
{
throw new InvalidLzFileException("Invalid .lz file, outputSize does not match actual output size.");
}
// Write uncompressed data to output stream
outputStream.Write(uncompressedData, 0, uncompressedData.Length);
}
