94 lines
3.2 KiB
C#
94 lines
3.2 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.Text;
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using System.IO;
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using System.IO.Compression;
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using System.Threading.Tasks;
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using Toolbox.Library.IO;
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using K4os.Compression.LZ4.Streams;
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namespace Toolbox.Library
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{
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//From https://github.com/xdanieldzd/N3DSCmbViewer/blob/3c3f66cf40d9122f8d0ebeab07c4db659b426b8b/N3DSCmbViewer/LZSS.cs
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//and https://github.com/lue/MM3D/blob/master/src/lzs.cpp
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public class LZSS : ICompressionFormat
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{
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public string[] Description { get; set; } = new string[] { "LZSS Compression" };
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public string[] Extension { get; set; } = new string[] { "*.lzs", "*.lzss" };
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public bool Identify(Stream stream)
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{
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using (var reader = new FileReader(stream, true))
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{
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return reader.CheckSignature(4, "LzS\x01");
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}
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}
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public bool CanCompress { get; } = true;
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public Stream Decompress(Stream stream)
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{
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byte[] arcdata = stream.ToArray();
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string tag = Encoding.ASCII.GetString(arcdata, 0, 4);
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uint unknown = BitConverter.ToUInt32(arcdata, 4);
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uint decompressedSize = BitConverter.ToUInt32(arcdata, 8);
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uint compressedSize = BitConverter.ToUInt32(arcdata, 12);
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if (arcdata.Length != compressedSize + 0x10) throw new Exception("compressed size mismatch");
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List<byte> outdata = new List<byte>();
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byte[] BUFFER = new byte[4096];
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for (int i = 0; i < BUFFER.Length; i++) BUFFER[i] = 0;
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byte flags8 = 0;
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ushort writeidx = 0xFEE;
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ushort readidx = 0;
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uint fidx = 0x10;
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while (fidx < arcdata.Length)
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{
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flags8 = arcdata[fidx];
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fidx++;
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for (int i = 0; i < 8; i++)
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{
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if ((flags8 & 1) != 0)
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{
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outdata.Add(arcdata[fidx]);
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BUFFER[writeidx] = arcdata[fidx];
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writeidx++; writeidx %= 4096;
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fidx++;
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}
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else
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{
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readidx = arcdata[fidx];
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fidx++;
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readidx |= (ushort)((arcdata[fidx] & 0xF0) << 4);
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for (int j = 0; j < (arcdata[fidx] & 0x0F) + 3; j++)
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{
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outdata.Add(BUFFER[readidx]);
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BUFFER[writeidx] = BUFFER[readidx];
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readidx++; readidx %= 4096;
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writeidx++; writeidx %= 4096;
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}
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fidx++;
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}
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flags8 >>= 1;
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if (fidx >= arcdata.Length) break;
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}
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}
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if (decompressedSize != outdata.Count)
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throw new Exception(string.Format("Size mismatch: got {0} bytes after decompression, expected {1}.\n", outdata.Count, decompressedSize));
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return new MemoryStream(outdata.ToArray());
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}
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public Stream Compress(Stream stream)
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{
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var mem = new MemoryStream();
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return stream;
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}
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}
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}
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