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Switch-Toolbox/Switch_Toolbox_Library/Compression/Formats/LZ77.cs

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C#
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using System;
using System.Collections.Generic;
using System.Linq;
using System.IO;
using System.IO.Compression;
using System.Threading.Tasks;
using Toolbox.Library.IO;
using Toolbox.Library.Forms;
using System.Runtime.InteropServices;
namespace Toolbox.Library
{
public class LZ77 : ICompressionFormat
{
public string[] Description { get; set; } = new string[] { "LZ77 Compressed" };
public string[] Extension { get; set; } = new string[] { "*.lz", };
bool isType11;
public bool Identify(Stream stream, string fileName)
{
if (stream.Length < 16)
return false;
using (var reader = new FileReader(stream, true))
{
if(Utils.GetExtension(fileName) == ".lz")
{
reader.SeekBegin(12);
isType11 = reader.ReadByte() == 0x11;
return isType11;
}
}
return false;
}
public bool CanCompress { get; } = false;
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private bool UseLZMAMagicHeader = true;
public Stream Decompress(Stream stream)
{
using (var reader = new FileReader(stream, true))
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{
if (isType11)
{
uint decomp_size = reader.ReadUInt32();
var sub = new SubStream(stream, 16);
return new MemoryStream(LZ77_WII.Decompress11(sub.ToArray(), (int)decomp_size));
}
else
{
return new MemoryStream();
}
}
}
public Stream Compress(Stream stream)
{
MemoryStream mem = new MemoryStream();
return mem;
}
}
}