60 lines
1.7 KiB
C#
60 lines
1.7 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.Linq;
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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 Switch_Toolbox.Library.IO;
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using K4os.Compression.LZ4.Streams;
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namespace Switch_Toolbox.Library
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{
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public class LZ4F : ICompressionFormat
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{
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public string[] Description { get; set; } = new string[] { "LZ4F Compression" };
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public string[] Extension { get; set; } = new string[] { "*.cmp", "*.lz4f" };
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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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uint DecompressedSize = reader.ReadUInt32();
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uint magicCheck = reader.ReadUInt32();
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bool LZ4FDefault = magicCheck == 0x184D2204;
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return LZ4FDefault;
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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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using (MemoryStream mem = new MemoryStream())
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{
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using (var source = LZ4Stream.Decode(stream))
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{
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source.CopyTo(mem);
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}
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return mem;
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}
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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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using (var writer = new FileWriter(mem))
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{
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var data = stream.ToArray();
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writer.Write(data.Length);
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byte[] buffer = LZ4.Frame.LZ4Frame.Compress(new MemoryStream(data),
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LZ4.Frame.LZ4MaxBlockSize.MB1, true, true, false, true, false);
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writer.Write(buffer, 0, buffer.Length);
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}
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return stream;
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}
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}
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}
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