Add unpacktool

unpacktool/LZSSDecompressor.h

@@ -0,0 +1,40 @@
+#pragma once
+
+#include "IDecompressor.h"
+
+#include <stdint.h>
+
+#define XADLZSSMatch -1
+#define XADLZSSEnd -2
+
+
+class LZSSDecompressor : public IDecompressor
+{
+public:
+	explicit LZSSDecompressor(int windowsize);
+	~LZSSDecompressor();
+
+	bool Reset(CSInputBuffer *input, size_t compressedSize, size_t decompressedSize) override;
+	bool ReadBytes(void *dest, size_t numBytes) override;
+
+	uint8_t ByteFromWindow(size_t absolutepos);
+
+private:
+	virtual bool nextLiteralOrOffset(int *offset, int *length, int &result) = 0;
+	virtual bool resetLZSSHandle() = 0;
+
+	bool ReadOneByte(uint8_t &b);
+
+	uint8_t *windowbuffer;
+	int windowmask,matchlength,matchoffset;
+	int windowsize;
+	int pos;
+
+protected:
+	CSInputBuffer *input;
+};
+
+inline uint8_t LZSSDecompressor::ByteFromWindow(size_t absolutepos)
+{
+	return this->windowbuffer[absolutepos&this->windowmask];
+}