decompress.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 NANCY_DECOMPRESS_H
#define NANCY_DECOMPRESS_H

#include "common/scummsys.h"

namespace Common {
class ReadStream;
class WriteStream;
class MemoryWriteStream;
}

namespace Nancy {

class Decompressor {
public:
    Decompressor();
    ~Decompressor();

    // Decompresses data from input until the end of the stream
    // The output stream must have the right size for the decompressed data
    bool decompress(Common::SeekableReadStream &input, Common::MemoryWriteStream &output);

private:
    enum {
        kBufSize = 4096,
        kBufStart = 4078
    };

    void init(Common::SeekableReadStream &input, Common::WriteStream &output);
    bool readByte(byte &b);
    bool writeByte(byte b);

    byte _buf[kBufSize];
    uint _bufpos;
    bool _err;
    byte _val;
    Common::WriteStream *_output;

    byte *_input;
    byte *_pos;
    byte *_end;
};

} // End of namespace Nancy

#endif // NANCY_DECOMPRESS_H