62 lines
2.0 KiB
C#
62 lines
2.0 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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namespace UniversalEditor.Compression.LZPL2
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{
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public class LZPL2CompressionModule
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{
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private int mvarBufferSize = 4096;
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public int BufferSize { get { return mvarBufferSize; } set { mvarBufferSize = value; } }
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private static LZPL2CompressionModule mvarDefaultModule = new LZPL2CompressionModule();
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public static LZPL2CompressionModule DefaultModule { get { return mvarDefaultModule; } }
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public byte[] Decompress(byte[] data, uint decompressedSize)
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{
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byte[] buffer = new byte[mvarBufferSize];
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byte mask = 0, flags = 0, x = 0, y = 0, b = 0;
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uint srcpos = 0, dstpos = 0;
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byte[] decompressedData = new byte[decompressedSize];
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while ((srcpos < data.Length) && (dstpos < decompressedData.Length))
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{
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if (mask == 0)
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{
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flags = data[srcpos++];
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if (srcpos >= data.Length) break;
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mask = 1;
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}
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if ((flags & mask) != 0)
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{
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// Raw byte
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buffer[dstpos % mvarBufferSize] = data[srcpos];
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decompressedData[dstpos++] = data[srcpos++];
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}
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else
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{
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// Pointer: 0xAB 0xCD (CAB=pointer, D=length)
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x = data[srcpos++];
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y = data[srcpos++];
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int off = (((y & 0xf0) << 4) | x) + 18;
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int len = (y & 0x0f) + 3;
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while ((len-- > 0) && (dstpos < decompressedData.Length))
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{
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b = buffer[off++ % mvarBufferSize];
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buffer[dstpos % mvarBufferSize] = b;
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decompressedData[dstpos++] = b;
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}
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}
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mask <<= 1;
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}
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return decompressedData;
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}
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}
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}
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