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https://github.com/libretro/scummvm.git
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67 lines
1.7 KiB
C++
67 lines
1.7 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#ifndef COMMON_RNC_DECO_H
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#define COMMON_RNC_DECO_H
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namespace Common {
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// Decoder for RNC (Rob Norton Computing) ProPack compression.
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class RncDecoder {
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protected:
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uint16 _rawTable[64];
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uint16 _posTable[64];
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uint16 _lenTable[64];
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uint16 _crcTable[256];
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uint16 _bitBuffl;
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uint16 _bitBuffh;
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uint8 _bitCount;
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const uint8 *_srcPtr;
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uint8 *_dstPtr;
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int32 _inputByteLeft;
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public:
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RncDecoder();
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~RncDecoder();
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int32 unpackM1(const void *input, uint inputSize, void *output);
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int32 unpackM2(const void *input, void *output);
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static const uint32 kRnc1Signature = 0x524E4301; // "RNC\001"
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static const uint32 kRnc2Signature = 0x524E4302; // "RNC\002"
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protected:
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void initCrc();
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uint16 crcBlock(const uint8 *block, uint32 size);
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uint16 inputBits(uint8 amount);
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void makeHufftable(uint16 *table);
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uint16 inputValue(uint16 *table);
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int getbit();
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};
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} // End of namespace Common
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#endif
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