public PKLibDecompress(Stream Input)
{
this.mStream = new BitStream(Input);
this.mCType = (CompressionType) Input.ReadByte();
if ((this.mCType != CompressionType.Binary) && (this.mCType != CompressionType.Ascii))
{
throw new Exception("Invalid compression type: " + this.mCType);
}
this.mDSizeBits = Input.ReadByte();
if ((4 > this.mDSizeBits) || (this.mDSizeBits > 6))
{
throw new Exception("Invalid dictionary size: " + this.mDSizeBits);
}
}
private static LinkedNode Decode(BitStream Input, LinkedNode Head)
{
LinkedNode node = Head;
while (node.Child0 != null)
{
int num = Input.ReadBits(1);
if (num == -1)
{
throw new Exception("Unexpected end of file");
}
node = (num == 0) ? node.Child0 : node.Child1;
}
return node;
}
public static byte[] Decompress(Stream Data)
{
int decompressedValue;
int index = Data.ReadByte();
if (index == 0)
{
throw new NotImplementedException("Compression type 0 is not currently supported");
}
LinkedNode tail = BuildList(sPrime[index]);
LinkedNode head = BuildTree(tail);
MemoryStream stream = new MemoryStream();
BitStream input = new BitStream(Data);
do
{
decompressedValue = Decode(input, head).DecompressedValue;
switch (decompressedValue)
{
case 0x100:
break;
case 0x101:
{
int decomp = input.ReadBits(8);
stream.WriteByte((byte) decomp);
tail = InsertNode(tail, decomp);
break;
}
default:
stream.WriteByte((byte) decompressedValue);
break;
}
}
while (decompressedValue != 0x100);
return stream.ToArray();
}
