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engines/dm/lzw.h

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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+/*
+ * Based on the Reverse Engineering work of Christophe Fontanel,
+ * maintainer of the Dungeon Master Encyclopaedia (http://dmweb.free.fr/)
+ */
+
+#ifndef DM_LZW_H
+#define DM_LZW_H
+
+#include "common/file.h"
+
+#include "dm/dm.h"
+
+namespace Common {
+	class MemoryReadStream;
+}
+
+namespace DM {
+class LZWdecompressor {
+	bool _repetitionEnabled;
+	int16 _codeBitCount;
+	int16 _currentMaximumCode;
+	int16 _absoluteMaximumCode;
+	byte _inputBuffer[12];
+	int16 _dictNextAvailableCode;
+	bool _dictFlushed;
+
+	byte _leastSignificantBitmasks[9];
+	int16 _inputBufferBitIndex;
+	int16 _inputBufferBitCount;
+	int16 _charToRepeat;
+
+	byte *_tempBuffer;
+	int16 *_prefixCode;
+	byte *_appendCharacter;
+
+	int16 getNextInputCode(Common::MemoryReadStream &stream, int32 *inputByteCount);
+	void outputCharacter(byte character, byte **out);
+	void operator=(const LZWdecompressor&); // deleted
+public:
+	LZWdecompressor();
+	~LZWdecompressor();
+	int32 decompress(Common::MemoryReadStream &inputStream, int32 inputByteCount, byte *out);
+};
+
+}
+
+#endif