lzss_read_stream.h

/* 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 ZVISION_LZSS_STREAM_H
#define ZVISION_LZSS_STREAM_H

#include "common/stream.h"
#include "common/array.h"

namespace Common {
class SeekableReadStream;
}

namespace ZVision {

class LzssReadStream : public Common::ReadStream {
public:
    LzssReadStream(Common::SeekableReadStream *source);

private:
    enum {
        BLOCK_SIZE = 0x1000
    };

private:
    Common::SeekableReadStream *_source;
    byte _window[BLOCK_SIZE];
    uint _windowCursor;
    bool _eosFlag;

public:
    bool eos() const override;
    uint32 read(void *dataPtr, uint32 dataSize) override;

private:
    uint32 decompressBytes(byte *destination, uint32 numberOfBytes);
};

}

#endif