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author | clone2727 | 2011-07-18 16:04:39 -0700 |
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committer | clone2727 | 2011-07-18 16:04:39 -0700 |
commit | 6370984b2238f90aa3e03ac70725b3cfc671d581 (patch) | |
tree | 031784ab3bfc44bff048e3b4d9b9e1e969a22af8 /common/huffman.cpp | |
parent | 85a056f3824151e4f1838de2ca3aeb7e824c32b8 (diff) | |
parent | 26d15ce675447070ed5ba99a3b21253b1a4459f7 (diff) | |
download | scummvm-rg350-6370984b2238f90aa3e03ac70725b3cfc671d581.tar.gz scummvm-rg350-6370984b2238f90aa3e03ac70725b3cfc671d581.tar.bz2 scummvm-rg350-6370984b2238f90aa3e03ac70725b3cfc671d581.zip |
Merge pull request #50 from clone2727/bink
Add support for Bink video to SCUMM HE
Diffstat (limited to 'common/huffman.cpp')
-rw-r--r-- | common/huffman.cpp | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/common/huffman.cpp b/common/huffman.cpp new file mode 100644 index 0000000000..a8ebe4142a --- /dev/null +++ b/common/huffman.cpp @@ -0,0 +1,86 @@ +/* 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 + +#include "common/huffman.h" +#include "common/util.h" +#include "common/textconsole.h" +#include "common/bitstream.h" + +namespace Common { + +Huffman::Symbol::Symbol(uint32 c, uint32 s) : code(c), symbol(s) { +} + + +Huffman::Huffman(uint8 maxLength, uint32 codeCount, const uint32 *codes, const uint8 *lengths, const uint32 *symbols) { + assert(codeCount > 0); + + assert(codes); + assert(lengths); + + if (maxLength == 0) + for (uint32 i = 0; i < codeCount; i++) + maxLength = MAX(maxLength, lengths[i]); + + assert(maxLength <= 32); + + _codes.resize(maxLength); + _symbols.resize(codeCount); + + for (uint32 i = 0; i < codeCount; i++) { + // The symbol. If none were specified, just assume it's identical to the code index + uint32 symbol = symbols ? symbols[i] : i; + + // Put the code and symbol into the correct list + _codes[lengths[i] - 1].push_back(Symbol(codes[i], symbol)); + + // And put the pointer to the symbol/code struct into the symbol list. + _symbols[i] = &_codes[lengths[i] - 1].back(); + } +} + +Huffman::~Huffman() { +} + +void Huffman::setSymbols(const uint32 *symbols) { + for (uint32 i = 0; i < _symbols.size(); i++) + _symbols[i]->symbol = symbols ? *symbols++ : i; +} + +uint32 Huffman::getSymbol(BitStream &bits) const { + uint32 code = 0; + + for (uint32 i = 0; i < _codes.size(); i++) { + bits.addBit(code, i); + + for (CodeList::const_iterator cCode = _codes[i].begin(); cCode != _codes[i].end(); ++cCode) + if (code == cCode->code) + return cCode->symbol; + } + + error("Unknown Huffman code"); + return 0; +} + +} // End of namespace Common |