mirror of
https://github.com/libretro/scummvm.git
synced 2025-01-31 16:03:24 +00:00
8add576cbc
Modified the Decompressor class so it no longer keeps a ReadStream for its input data. This helps us avoid doing a vtable lookup for every byte read, and halves the time needed to decompress.
68 lines
1.7 KiB
C++
68 lines
1.7 KiB
C++
/* 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
|