public static byte[] Decompress(Stream stream)
{
using (var br = new BinaryReader(stream, Encoding.Default, true))
{
int sizeAndMethod = br.ReadInt32();
int size = sizeAndMethod / 8;
var method = (Method)(sizeAndMethod % 8);
switch (method)
{
case Method.NoCompression:
return(br.ReadBytes(size));
case Method.LZ10:
return(LZ10.Decompress(br.BaseStream, size));
case Method.Huffman4Bit:
case Method.Huffman8Bit:
int num_bits = method == Method.Huffman4Bit ? 4 : 8;
return(Huffman.Decompress(br.BaseStream, num_bits, size, ByteOrder.LittleEndian));
case Method.RLE:
return(RLE.Decompress(br.BaseStream, size));
default:
throw new NotSupportedException($"Unknown compression method {method}");
}
}
}
public static byte[] Compress(Stream input, Method method)
{
if (input.Length > 0xffffff)
{
throw new Exception("File too big to be compressed with Nintendo compression!");
}
var res = new List <byte>();
res.AddRange(new byte[] { (byte)method, (byte)(input.Length & 0xff), (byte)(input.Length >> 8 & 0xff), (byte)(input.Length >> 16 & 0xff) });
switch (method)
{
case Method.LZ10:
res.AddRange(LZ10.Compress(input));
return(res.ToArray());
case Method.LZ11:
res.AddRange(LZ11.Compress(input));
return(res.ToArray());
case Method.Huff4:
res.AddRange(Huffman.Compress(input, 4, ByteOrder.BigEndian));
return(res.ToArray());
case Method.Huff8:
res.AddRange(Huffman.Compress(input, 8));
return(res.ToArray());
case Method.RLE:
res.AddRange(RLE.Compress(input));
return(res.ToArray());
case Method.LZ40:
res.AddRange(LZ40.Compress(input));
return(res.ToArray());
case Method.LZ60: //yes, LZ60 does indeed seem to be the exact same as LZ40
res.AddRange(LZ40.Compress(input));
return(res.ToArray());
default:
return(input.StructToBytes());
}
}
public static byte[] Decompress(Stream input)
{
using (var br = new BinaryReaderX(input, true))
{
var methodSize = br.ReadUInt32();
var method = (Method)(methodSize & 0xff);
int size = (int)((methodSize & 0xffffff00) >> 8);
using (var brB = new BinaryReaderX(new MemoryStream(br.ReadBytes((int)input.Length - 4))))
switch (method)
{
case Method.LZ10:
return(LZ10.Decompress(brB.BaseStream, size));
case Method.LZ11:
return(LZ11.Decompress(brB.BaseStream, size));
case Method.Huff4:
return(Huffman.Decompress(brB.BaseStream, 4, size, ByteOrder.BigEndian));
case Method.Huff8:
return(Huffman.Decompress(brB.BaseStream, 8, size));
case Method.RLE:
return(RLE.Decompress(brB.BaseStream, size));
case Method.LZ40:
return(LZ40.Decompress(brB.BaseStream, size));
case Method.LZ60: //yes, LZ60 does indeed seem to be the exact same as LZ40
return(LZ40.Decompress(brB.BaseStream, size));
default:
br.BaseStream.Position -= 4;
return(br.BaseStream.StructToBytes());
}
}
}
public static byte[] Decompress(Stream input)
{
using (var br = new BinaryReaderX(input, true))
{
var methodSize = br.ReadUInt32();
var method = (Method)(methodSize & 0xff);
int size = (int)((methodSize & 0xffffff00) >> 8);
using (var brB = new BinaryReaderX(new MemoryStream(br.ReadBytes((int)input.Length - 4))))
switch (method)
{
case Method.LZ10:
return(LZ10.Decompress(brB.BaseStream, size));
case Method.LZ11:
return(LZ11.Decompress(brB.BaseStream, size));
case Method.Huff4:
return(Huffman.Decompress(brB.BaseStream, 4, size, ByteOrder.BigEndian));
case Method.Huff8:
return(Huffman.Decompress(brB.BaseStream, 8, size));
case Method.RLE:
return(RLE.Decompress(brB.BaseStream, size));
case Method.LZ60:
throw new Exception("LZ60 isn't implemented yet");
//return LZ60.Decompress(brB.BaseStream);
default:
br.BaseStream.Position -= 4;
return(br.BaseStream.StructToBytes());
}
}
}
public static byte[] Compress(Stream stream, Method method)
{
if (stream.Length > 0x1fffffff)
{
throw new Exception("File is too big to be compressed with Level5 compressions!");
}
uint methodSize = (uint)stream.Length << 3;
switch (method)
{
case Method.NoCompression:
using (var bw = new BinaryWriterX(new MemoryStream()))
{
bw.Write(methodSize);
stream.Position = 0;
stream.CopyTo(bw.BaseStream);
bw.BaseStream.Position = 0;
return(new BinaryReaderX(bw.BaseStream).ReadBytes((int)bw.BaseStream.Length));
}
case Method.LZ10:
methodSize |= 0x1;
using (var bw = new BinaryWriterX(new MemoryStream()))
{
bw.Write(methodSize);
stream.Position = 0;
var comp = LZ10.Compress(stream);
bw.Write(comp);
bw.BaseStream.Position = 0;
return(new BinaryReaderX(bw.BaseStream).ReadBytes((int)bw.BaseStream.Length));
}
case Method.Huffman4Bit:
methodSize |= 0x2;
using (var bw = new BinaryWriterX(new MemoryStream()))
{
bw.Write(methodSize);
stream.Position = 0;
var comp = Huffman.Compress(stream, 4);
bw.Write(comp);
bw.BaseStream.Position = 0;
return(new BinaryReaderX(bw.BaseStream).ReadBytes((int)bw.BaseStream.Length));
}
case Method.Huffman8Bit:
methodSize |= 0x3;
using (var bw = new BinaryWriterX(new MemoryStream()))
{
bw.Write(methodSize);
stream.Position = 0;
var comp = Huffman.Compress(stream, 8);
bw.Write(comp);
bw.BaseStream.Position = 0;
return(new BinaryReaderX(bw.BaseStream).ReadBytes((int)bw.BaseStream.Length));
}
case Method.RLE:
methodSize |= 0x4;
using (var bw = new BinaryWriterX(new MemoryStream()))
{
bw.Write(methodSize);
stream.Position = 0;
var comp = RLE.Compress(stream);
bw.Write(comp);
bw.BaseStream.Position = 0;
return(new BinaryReaderX(bw.BaseStream).ReadBytes((int)bw.BaseStream.Length));
}
default:
throw new Exception($"Unsupported compression method {method}!");
}
}