mirror of
https://github.com/simtactics/mysimulation.git
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419 lines
16 KiB
C#
419 lines
16 KiB
C#
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using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.IO;
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namespace FSO.Files.FAR3
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{
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/// <summary>
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/// Represents a decompresser that can decompress files in a FAR3
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/// archive. If you have some kind of need to understand this code, go to:
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/// http://wiki.niotso.org/RefPack
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/// The code in this class was ported from DBPF4J:
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/// http://sc4dbpf4j.cvs.sourceforge.net/viewvc/sc4dbpf4j/DBPF4J/
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/// </summary>
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public class Decompresser
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{
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private long m_CompressedSize = 0;
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private long m_DecompressedSize = 0;
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public long DecompressedSize
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{
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get { return m_DecompressedSize; }
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set { m_DecompressedSize = value; }
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}
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public long CompressedSize
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{
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get { return m_CompressedSize; }
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set { m_CompressedSize = value; }
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}
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/// <summary>
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/// Copies data from source to destination array.<br>
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/// The copy is byte by byte from srcPos to destPos and given length.
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/// </summary>
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/// <param name="Src">The source array.</param>
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/// <param name="SrcPos">The source Position.</param>
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/// <param name="Dest">The destination array.</param>
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/// <param name="DestPos">The destination Position.</param>
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/// <param name="Length">The length.</param>
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private void ArrayCopy2(byte[] Src, int SrcPos, ref byte[] Dest, int DestPos, long Length)
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{
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if (Dest.Length < DestPos + Length)
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{
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byte[] DestExt = new byte[(int)(DestPos + Length)];
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Array.Copy(Dest, 0, DestExt, 0, Dest.Length);
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Dest = DestExt;
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}
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for (int i = 0; i < Length/* - 1*/; i++)
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Dest[DestPos + i] = Src[SrcPos + i];
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}
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/// <summary>
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/// Copies data from array at destPos-srcPos to array at destPos.
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/// </summary>
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/// <param name="array">The array.</param>
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/// <param name="srcPos">The Position to copy from (reverse from end of array!)</param>
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/// <param name="destPos">The Position to copy to.</param>
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/// <param name="length">The length of data to copy.</param>
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private void OffsetCopy(ref byte[] array, int srcPos, int destPos, long length)
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{
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srcPos = destPos - srcPos;
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if (array.Length < destPos + length)
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{
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byte[] NewArray = new byte[(int)(destPos + length)];
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Array.Copy(array, 0, NewArray, 0, array.Length);
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array = NewArray;
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}
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for (int i = 0; i < length /*- 1*/; i++)
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{
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array[destPos + i] = array[srcPos + i];
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}
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}
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/// <summary>
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/// Compresses data and returns it as an array of bytes.
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/// Assumes that the array of bytes passed contains
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/// uncompressed data.
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/// </summary>
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/// <param name="Data">The data to be compressed.</param>
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/// <returns>An array of bytes with compressed data.</returns>
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public byte[] Compress(byte[] Data)
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{
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// if data is big enough for compress
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if (Data.Length > 6)
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{
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// some Compression Data
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const int MAX_OFFSET = 0x20000;
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const int MAX_COPY_COUNT = 0x404;
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// used to finetune the lookup (small values increase the
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// compression for Big Files)
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const int QFS_MAXITER = 0x80;
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// contains the latest offset for a combination of two
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// characters
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Dictionary<int, ArrayList> cmpmap2 = new Dictionary<int, ArrayList>();
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// will contain the compressed data (maximal size =
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// uncompressedSize+MAX_COPY_COUNT)
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byte[] cData = new byte[Data.Length + MAX_COPY_COUNT];
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// init some vars
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int writeIndex = 9; // leave 9 bytes for the header
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int lastReadIndex = 0;
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ArrayList indexList = null;
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int copyOffset = 0;
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int copyCount = 0;
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int index = -1;
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bool end = false;
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// begin main compression loop
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while (index < Data.Length - 3)
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{
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// get all Compression Candidates (list of offsets for all
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// occurances of the current 3 bytes)
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do
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{
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index++;
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if (index >= Data.Length - 2)
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{
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end = true;
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break;
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}
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int mapindex = Data[index] + (Data[index + 1] << 8)
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+ (Data[index + 2] << 16);
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indexList = cmpmap2[mapindex];
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if (indexList == null)
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{
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indexList = new ArrayList();
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cmpmap2.Add(mapindex, indexList);
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}
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indexList.Add(index);
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} while (index < lastReadIndex);
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if (end)
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break;
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// find the longest repeating byte sequence in the index
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// List (for offset copy)
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int offsetCopyCount = 0;
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int loopcount = 1;
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while ((loopcount < indexList.Count) && (loopcount < QFS_MAXITER))
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{
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int foundindex = (int) indexList[(indexList.Count - 1) - loopcount];
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if ((index - foundindex) >= MAX_OFFSET)
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{
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break;
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}
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loopcount++;
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copyCount = 3;
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while ((Data.Length > index + copyCount)&& (Data[index + copyCount] == Data[foundindex + copyCount]) && (copyCount < MAX_COPY_COUNT))
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{
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copyCount++;
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}
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if (copyCount > offsetCopyCount)
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{
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offsetCopyCount = copyCount;
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copyOffset = index - foundindex;
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}
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}
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// check if we can compress this
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// In FSH Tool stand additionally this:
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if (offsetCopyCount > Data.Length - index)
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{
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offsetCopyCount = index - Data.Length;
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}
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if (offsetCopyCount <= 2)
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{
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offsetCopyCount = 0;
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}
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else if ((offsetCopyCount == 3) && (copyOffset > 0x400))
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{ // 1024
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offsetCopyCount = 0;
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}
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else if ((offsetCopyCount == 4) && (copyOffset > 0x4000))
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{ // 16384
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offsetCopyCount = 0;
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}
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// this is offset-compressable? so do the compression
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if (offsetCopyCount > 0)
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{
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// plaincopy
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// In FSH Tool stand this (A):
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while (index - lastReadIndex >= 4)
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{
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copyCount = (index - lastReadIndex) / 4 - 1;
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if (copyCount > 0x1B)
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{
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copyCount = 0x1B;
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}
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cData[writeIndex++] = (byte)(0xE0 + copyCount);
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copyCount = 4 * copyCount + 4;
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ArrayCopy2(Data, lastReadIndex, ref cData, writeIndex, copyCount);
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lastReadIndex += copyCount;
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writeIndex += copyCount;
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}
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// offsetcopy
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copyCount = index - lastReadIndex;
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copyOffset--;
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if ((offsetCopyCount <= 0x0A) && (copyOffset < 0x400))
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{
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cData[writeIndex++] = (byte) (((copyOffset >> 8) << 5)
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+ ((offsetCopyCount - 3) << 2) + copyCount);
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cData[writeIndex++] = (byte)(copyOffset & 0xff);
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}
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else if ((offsetCopyCount <= 0x43) && (copyOffset < 0x4000))
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{
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cData[writeIndex++] = (byte)(0x80 + (offsetCopyCount - 4));
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cData[writeIndex++] = (byte) ((copyCount << 6) + (copyOffset >> 8));
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cData[writeIndex++] = (byte) (copyOffset & 0xff);
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}
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else if ((offsetCopyCount <= MAX_COPY_COUNT) && (copyOffset < MAX_OFFSET))
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{
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cData[writeIndex++] = (byte)(0xc0
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+ ((copyOffset >> 16) << 4)
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+ (((offsetCopyCount - 5) >> 8) << 2) + copyCount);
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cData[writeIndex++] = (byte)((copyOffset >> 8) & 0xff);
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cData[writeIndex++] = (byte)(copyOffset & 0xff);
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cData[writeIndex++] = (byte)((offsetCopyCount - 5) & 0xff);
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}
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// do the offset copy
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ArrayCopy2(Data, lastReadIndex, ref cData, writeIndex, copyCount);
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writeIndex += copyCount;
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lastReadIndex += copyCount;
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lastReadIndex += offsetCopyCount;
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}
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}
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// add the End Record
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index = Data.Length;
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// in FSH Tool stand the same as above (A)
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while (index - lastReadIndex >= 4)
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{
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copyCount = (index - lastReadIndex) / 4 - 1;
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if (copyCount > 0x1B)
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copyCount = 0x1B;
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cData[writeIndex++] = (byte)(0xE0 + copyCount);
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copyCount = 4 * copyCount + 4;
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ArrayCopy2(Data, lastReadIndex, ref cData, writeIndex, copyCount);
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lastReadIndex += copyCount;
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writeIndex += copyCount;
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}
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copyCount = index - lastReadIndex;
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cData[writeIndex++] = (byte) (0xfc + copyCount);
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ArrayCopy2(Data, lastReadIndex, ref cData, writeIndex, copyCount);
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writeIndex += copyCount;
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lastReadIndex += copyCount;
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MemoryStream DataStream = new MemoryStream();
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BinaryWriter Writer = new BinaryWriter(DataStream);
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// write the header for the compressed data
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// set the compressed size
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Writer.Write((uint)writeIndex);
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m_CompressedSize = writeIndex;
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// set the MAGICNUMBER
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Writer.Write((ushort)0xFB10);
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// set the decompressed size
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byte[] revData = BitConverter.GetBytes(Data.Length);
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Writer.Write((revData[2] << 16) | (revData[1] << 8) | revData[0]);
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Writer.Write(cData);
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//Avoid nasty swearing here!
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Writer.Flush();
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m_DecompressedSize = Data.Length;
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return DataStream.ToArray();
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}
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return Data;
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}
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/// <summary>
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/// Decompresses data and returns it as an
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/// uncompressed array of bytes.
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/// </summary>
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/// <param name="Data">The data to decompress.</param>
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/// <returns>An uncompressed array of bytes.</returns>
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public byte[] Decompress(byte[] Data)
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{
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MemoryStream MemData = new MemoryStream(Data);
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BinaryReader Reader = new BinaryReader(MemData);
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if (Data.Length > 6)
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{
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byte[] DecompressedData = new byte[(int)m_DecompressedSize];
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int DataPos = 0;
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int Pos = 0;
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long Control1 = 0;
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while (Control1 != 0xFC && Pos < Data.Length)
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{
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Control1 = Data[Pos];
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Pos++;
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if (Pos == Data.Length)
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break;
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if (Control1 >= 0 && Control1 <= 127)
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{
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// 0x00 - 0x7F
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long control2 = Data[Pos];
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Pos++;
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long numberOfPlainText = (Control1 & 0x03);
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ArrayCopy2(Data, Pos, ref DecompressedData, DataPos, numberOfPlainText);
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DataPos += (int)numberOfPlainText;
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Pos += (int)numberOfPlainText;
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if (DataPos == (DecompressedData.Length))
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break;
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int offset = (int)(((Control1 & 0x60) << 3) + (control2) + 1);
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long numberToCopyFromOffset = ((Control1 & 0x1C) >> 2) + 3;
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OffsetCopy(ref DecompressedData, offset, DataPos, numberToCopyFromOffset);
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DataPos += (int)numberToCopyFromOffset;
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if (DataPos == (DecompressedData.Length))
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break;
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}
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else if ((Control1 >= 128 && Control1 <= 191))
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{
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// 0x80 - 0xBF
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long control2 = Data[Pos];
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Pos++;
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long control3 = Data[Pos];
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Pos++;
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long numberOfPlainText = (control2 >> 6) & 0x03;
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ArrayCopy2(Data, Pos, ref DecompressedData, DataPos, numberOfPlainText);
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DataPos += (int)numberOfPlainText;
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Pos += (int)numberOfPlainText;
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if (DataPos == (DecompressedData.Length))
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break;
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int offset = (int)(((control2 & 0x3F) << 8) + (control3) + 1);
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long numberToCopyFromOffset = (Control1 & 0x3F) + 4;
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OffsetCopy(ref DecompressedData, offset, DataPos, numberToCopyFromOffset);
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DataPos += (int)numberToCopyFromOffset;
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if (DataPos == (DecompressedData.Length))
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break;
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}
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else if (Control1 >= 192 && Control1 <= 223)
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|||
|
|
{
|
|||
|
|
// 0xC0 - 0xDF
|
|||
|
|
long numberOfPlainText = (Control1 & 0x03);
|
|||
|
|
long control2 = Data[Pos];
|
|||
|
|
Pos++;
|
|||
|
|
long control3 = Data[Pos];
|
|||
|
|
Pos++;
|
|||
|
|
long control4 = Data[Pos];
|
|||
|
|
Pos++;
|
|||
|
|
ArrayCopy2(Data, Pos, ref DecompressedData, DataPos, numberOfPlainText);
|
|||
|
|
DataPos += (int)numberOfPlainText;
|
|||
|
|
Pos += (int)numberOfPlainText;
|
|||
|
|
|
|||
|
|
if (DataPos == (DecompressedData.Length))
|
|||
|
|
break;
|
|||
|
|
|
|||
|
|
int offset = (int)(((Control1 & 0x10) << 12) + (control2 << 8) + (control3) + 1);
|
|||
|
|
long numberToCopyFromOffset = ((Control1 & 0x0C) << 6) + (control4) + 5;
|
|||
|
|
OffsetCopy(ref DecompressedData, offset, DataPos, numberToCopyFromOffset);
|
|||
|
|
DataPos += (int)numberToCopyFromOffset;
|
|||
|
|
|
|||
|
|
if (DataPos == (DecompressedData.Length))
|
|||
|
|
break;
|
|||
|
|
}
|
|||
|
|
else if (Control1 >= 224 && Control1 <= 251)
|
|||
|
|
{
|
|||
|
|
// 0xE0 - 0xFB
|
|||
|
|
long numberOfPlainText = ((Control1 & 0x1F) << 2) + 4;
|
|||
|
|
ArrayCopy2(Data, Pos, ref DecompressedData, DataPos, numberOfPlainText);
|
|||
|
|
DataPos += (int)numberOfPlainText;
|
|||
|
|
Pos += (int)numberOfPlainText;
|
|||
|
|
|
|||
|
|
if (DataPos == (DecompressedData.Length))
|
|||
|
|
break;
|
|||
|
|
}
|
|||
|
|
else
|
|||
|
|
{
|
|||
|
|
long numberOfPlainText = (Control1 & 0x03);
|
|||
|
|
ArrayCopy2(Data, Pos, ref DecompressedData, DataPos, numberOfPlainText);
|
|||
|
|
|
|||
|
|
DataPos += (int)numberOfPlainText;
|
|||
|
|
Pos += (int)numberOfPlainText;
|
|||
|
|
|
|||
|
|
if (DataPos == (DecompressedData.Length))
|
|||
|
|
break;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
return DecompressedData;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
//No data to decompress
|
|||
|
|
return Data;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
}
|