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73 lines
1.9 KiB
C++
73 lines
1.9 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
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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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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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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#ifndef ZVISION_LZSS_STREAM_H
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#define ZVISION_LZSS_STREAM_H
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#include "common/types.h"
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#include "common/stream.h"
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#include "common/array.h"
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namespace Common {
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class SeekableReadStream;
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}
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namespace ZVision {
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class LzssReadStream : public Common::ReadStream {
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public:
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/**
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* A class that decompresses LZSS data and implements ReadStream for easy access
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* to the decompiled data.
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*
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* @param source The source data
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*/
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LzssReadStream(Common::SeekableReadStream *source);
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private:
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enum {
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BLOCK_SIZE = 0x1000
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};
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private:
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Common::SeekableReadStream *_source;
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byte _window[BLOCK_SIZE];
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uint _windowCursor;
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bool _eosFlag;
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public:
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bool eos() const;
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uint32 read(void *dataPtr, uint32 dataSize);
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private:
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/**
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* Decompress the next <numberOfBytes> from the source stream. Or until EOS
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*
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* @param numberOfBytes How many bytes to decompress. This is a count of source bytes, not destination bytes
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*/
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uint32 decompressBytes(byte* destination, uint32 numberOfBytes);
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};
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}
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#endif
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