/* 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. * */ #ifndef ZVISION_LZSS_STREAM_H #define ZVISION_LZSS_STREAM_H #include "common/types.h" #include "common/stream.h" #include "common/memstream.h" #include "common/array.h" namespace ZVision { class LzssReadStream : public Common::ReadStream { public: /** * A class that decompresses LZSS data and implements ReadStream for easy access * to the decompiled data. It can either decompress all the data in the beginning * or decompress as needed by read(). * * @param source The source data * @param stream Decompress the data as needed (true) or all at once (false) * @param decompressedSize The size of the decompressed data. If npos, the class will choose a size and grow as needed */ LzssReadStream(Common::SeekableReadStream *source, bool stream = true, uint32 decompressedSize = _npos); public: static const uint32 _npos = 0xFFFFFFFFu; static const uint16 _blockSize = 0x1000u; private: Common::SeekableReadStream *_source; Common::Array _destination; char _window[_blockSize]; uint16 _windowCursor; uint32 _readCursor; bool _eosFlag; public: bool eos() const; uint32 read(void *dataPtr, uint32 dataSize); uint32 currentSize() const; private: /** * Decompress the next from the source stream. Or until EOS * * @param numberOfBytes How many bytes to decompress. This is a count of source bytes, not destination bytes */ void decompressBytes(uint32 numberOfBytes); /** Decompress all of the source stream. */ void decompressAll(); }; } #endif