1 files changed, 88 insertions, 0 deletions
diff --git a/reader/src/formats/chm/LZXDecompressor.h b/reader/src/formats/chm/LZXDecompressor.h
new file mode 100644
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+++ b/reader/src/formats/chm/LZXDecompressor.h
@@ -0,0 +1,88 @@
+/*
+ * Copyright (C) 2004-2012 Geometer Plus <[email protected]>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+#ifndef __LZXDECOMPRESSOR_H__
+#define __LZXDECOMPRESSOR_H__
+
+#include <string>
+#include <vector>
+
+#include "BitStream.h"
+#include "HuffmanDecoder.h"
+
+class LZXDecompressor {
+
+public:
+	LZXDecompressor(int windowSizeIndex);
+	void reset();
+
+	bool decompress(const std::string &data, unsigned char *outBuffer, const std::size_t outSize);
+
+private:
+	struct DecodingState {
+		std::vector<unsigned char>::iterator WindowIterator;
+		unsigned int R0;
+		unsigned int R1;
+		unsigned int R2;
+	};
+
+	bool readLengths(HuffmanDecoder &decoder, std::size_t from, std::size_t size);
+	bool decodeBytes(DecodingState &state, std::size_t bytesToDecode);
+
+private:
+	enum BlockType {
+		UNKNOWNN = 0,
+		VERBATIM = 1,
+		ALIGNED = 2,
+		UNCOMPRESSED = 3
+	};
+
+	BlockType myCurrentBlockType;
+	bool myReadHeader;
+
+	std::vector<unsigned char> myWindow;
+
+	DecodingState myState;
+
+	std::size_t myBlockSize;
+	std::size_t myBlockBytesLeft;
+
+	const unsigned int mySlotNumber;
+	HuffmanDecoder myMainTree;
+	HuffmanDecoder myLengthTree;
+	HuffmanDecoder myAlignedOffsetTree;
+
+	BitStream myBitStream;
+
+	class E8Decoder {
+
+	public:
+		void reset(unsigned int fileSize);
+		void decode(unsigned char *buffer, const std::size_t size);
+
+	private:
+		unsigned int myFramesCounter;
+		unsigned int myFileSize;
+		unsigned int myPosition;
+	};
+
+	E8Decoder myE8Decoder;
+};
+
+#endif /* __LZXDECOMPRESSOR_H__ */