lzostraw.h

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/*
**  Command & Conquer Generals Zero Hour(tm)
**  Copyright 2025 Electronic Arts Inc.
**
**  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/>.
*/
 
/*********************************************************************************************** 
 ***              C O N F I D E N T I A L  ---  W E S T W O O D  S T U D I O S               *** 
 *********************************************************************************************** 
 *                                                                                             * 
 *                 Project Name : Command & Conquer                                            * 
 *                                                                                             * 
 *                     $Archive:: /Commando/Library/lzostraw.h                                $* 
 *                                                                                             * 
 *                      $Author:: Greg_h                                                      $*
 *                                                                                             * 
 *                     $Modtime:: 7/22/97 11:37a                                              $*
 *                                                                                             * 
 *                    $Revision:: 1                                                           $*
 *                                                                                             *
 *---------------------------------------------------------------------------------------------* 
 * Functions:                                                                                  * 
 * - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
 
#ifndef LZOSTRAW_H
#define LZOSTRAW_H
 
 
#include    "straw.h"
 
/*
**  This class handles LZO compression/decompression to the data stream that is drawn through
**  this class. Note that for compression, two internal buffers are required. For decompression
**  only one buffer is required. This changes the memory footprint of this class depending on
**  the process desired.
*/
class LZOStraw : public Straw
{
    public:
        typedef enum CompControl {
            COMPRESS,
            DECOMPRESS
        } CompControl;
 
        LZOStraw(CompControl control, int blocksize=1024*8);
        virtual ~LZOStraw(void);
 
        virtual int Get(void * source, int slen);
 
    private:
 
        /*
        **  This tells the pipe if it should be decompressing or compressing the data stream.
        */
        CompControl Control;
 
        /*
        **  The number of bytes accumulated into the staging buffer.
        */
        int Counter;
 
        /*
        **  Pointer to the working buffer that compression/decompression will use.
        */
        char * Buffer;
        char * Buffer2;
 
        /*
        **  The working block size. Data will be compressed in chunks of this size.
        */
        int BlockSize;
 
        /*
        **  Probably dont need this anymore as LZO decompresses into a staging buffer.
        */
        int SafetyMargin;
 
        /*
        **  Each block has a header of this format.
        */
        struct {
            unsigned short CompCount;      // Size of data block (compressed).
            unsigned short UncompCount;  // Bytes of uncompressed data it represents.
        } BlockHeader;
 
        LZOStraw(LZOStraw & rvalue);
        LZOStraw & operator = (LZOStraw const & pipe);
};
 
 
#endif