private void BkDecrunch(string infile, string outfile)
{
SourceBuffer = File.ReadAllBytes(infile);
uint len = ReadUInt32(SourceBuffer, 4);
SourcePtr = ReadUInt32(SourceBuffer, 0) + Headersize;
Checksum = ReadUInt32(SourceBuffer, 8);
BkNextBitStream();
do
{
if (BkNextBit() == 1)
{
uint type = BkReadBits(2);
if (type < 2)
{
BkDoDuplicate(type + 9, type + 2);
}
else if (type == 3)
{
BkDoJmp(8, 8);
}
else
{
BkDoDuplicate(12, BkReadBits(8));
}
}
else
{
if (BkNextBit() == 1)
{
BkDoDuplicate(8, 1);
}
else
{
BkDoJmp(3, 0);
}
}
}while (ResultBuffer.Count < len);
File.WriteAllBytes(outfile, ResultBuffer.ToArray());
}
private void BkCrunch(string infile, string outfile, uint scanWidth)
{
SourceBuffer = File.ReadAllBytes(infile);
uint scanend = 0, bestlen = 0, scanptr = 0, copylen = 0, copytype = 0, besttype = 0, dumpcnt = 0;
uint copyoffs = 0, bestoffs = 0;
while (SourcePtr < SourceBuffer.Length)
{
scanend = (SourcePtr + scanWidth > (uint)SourceBuffer.Length) ? (uint)SourceBuffer.Length - 1 : SourcePtr + scanWidth;
bestlen = 1;
scanptr = SourcePtr + 1;
while (scanptr < scanend)
{
if (SourceBuffer[SourcePtr] == SourceBuffer[scanptr] && SourceBuffer[SourcePtr + 1] == SourceBuffer[scanptr + 1])
{
while ((scanptr + copylen) < scanend && SourceBuffer[SourcePtr + copylen] == SourceBuffer[scanptr + copylen])
{
copylen++;
}
if (copylen > bestlen)
{
copyoffs = scanptr - SourcePtr;
if (copylen > 4)
{
copytype = 3;
copylen = copylen > 0x100 ? 0x100 : copylen;
}
else
{
copytype = copylen - 2;
}
if (copyoffs < MaxOffsets[copytype])
{
bestlen = copylen;
bestoffs = copyoffs;
besttype = copytype;
}
}
scanptr += copylen;
copylen = 0;
}
else
{
scanptr++;
}
}
if (bestlen > 1)
{
BkDump(dumpcnt);
dumpcnt = 0;
BkWriteBits(OffsBits[besttype], bestoffs);
if (besttype == 3)
{
BkWriteBits(8, bestlen - 1);
}
BkWriteBits(CmdBits[besttype], CmdWord[besttype]);
SourcePtr += bestlen;
}
else
{
BkWriteBits(8, SourceBuffer[SourcePtr++]);
if (++dumpcnt >= 0x108)
{
BkDump(dumpcnt);
dumpcnt = 0;
}
}
}
BkDump(dumpcnt);
BitStream |= Convert.ToUInt32(1L << (32 - FreeBits));
BkWriteBitStream();
InsertIntoResultBuffer(0, Checksum);
InsertIntoResultBuffer(0, (uint)SourceBuffer.Length);
InsertIntoResultBuffer(0, (uint)ResultBuffer.Count - 8);
File.WriteAllBytes(outfile, ResultBuffer.ToArray());
}
