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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 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.
+ *
+ */
+
+// Based on eos' Huffman code
+
+#ifndef COMMON_HUFFMAN_H
+#define COMMON_HUFFMAN_H
+
+#include "common/array.h"
+#include "common/list.h"
+#include "common/types.h"
+
+namespace Common {
+
+class BitStream;
+
+/**
+ * Huffman bitstream decoding
+ *
+ * Used in engines:
+ *  - scumm
+ */
+class Huffman {
+public:
+	/** Construct a Huffman decoder.
+	 *
+	 *  @param maxLength Maximal code length. If 0, it's searched for.
+	 *  @param codeCount Number of codes.
+	 *  @param codes The actual codes.
+	 *  @param lengths Lengths of the individual codes.
+	 *  @param symbols The symbols. If 0, assume they are identical to the code indices.
+	 */
+	Huffman(uint8 maxLength, uint32 codeCount, const uint32 *codes, const uint8 *lengths, const uint32 *symbols = 0);
+	~Huffman();
+
+	/** Modify the codes' symbols. */
+	void setSymbols(const uint32 *symbols = 0);
+
+	/** Return the next symbol in the bitstream. */
+	uint32 getSymbol(BitStream &bits) const;
+
+private:
+	struct Symbol {
+		uint32 code;
+		uint32 symbol;
+
+		Symbol(uint32 c, uint32 s);
+	};
+
+	typedef List<Symbol> CodeList;
+	typedef Array<CodeList> CodeLists;
+	typedef Array<Symbol*> SymbolList;
+
+	/** Lists of codes and their symbols, sorted by code length. */
+	CodeLists _codes;
+
+	/** Sorted list of pointers to the symbols. */
+	SymbolList _symbols;
+};
+
+} // End of namespace Common
+
+#endif // COMMON_HUFFMAN_H