Initial commit

common/compression/rnc_deco.h

@@ -0,0 +1,66 @@
+/* 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/>.
+ *
+ */
+
+#ifndef COMMON_RNC_DECO_H
+#define COMMON_RNC_DECO_H
+
+
+namespace Common {
+
+// Decoder for RNC (Rob Norton Computing) ProPack compression.
+class RncDecoder {
+
+protected:
+	uint16 _rawTable[64];
+	uint16 _posTable[64];
+	uint16 _lenTable[64];
+	uint16 _crcTable[256];
+
+	uint16 _bitBuffl;
+	uint16 _bitBuffh;
+	uint8 _bitCount;
+
+	const uint8 *_srcPtr;
+	uint8 *_dstPtr;
+
+	int32 _inputByteLeft;
+
+public:
+	RncDecoder();
+	~RncDecoder();
+	int32 unpackM1(const void *input, uint inputSize, void *output);
+	int32 unpackM2(const void *input, void *output);
+
+	static const uint32 kRnc1Signature = 0x524E4301; // "RNC\001"
+	static const uint32 kRnc2Signature = 0x524E4302; // "RNC\002"
+
+protected:
+	void initCrc();
+	uint16 crcBlock(const uint8 *block, uint32 size);
+	uint16 inputBits(uint8 amount);
+	void makeHufftable(uint16 *table);
+	uint16 inputValue(uint16 *table);
+	int getbit();
+};
+
+} // End of namespace Common
+
+#endif