lzo.cpp

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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 : WWLib                                                        *
 *                                                                                             *
 *                     $Archive:: /Commando/Code/wwlib/lzo.cpp                                $*
 *                                                                                             *
 *                       Author:: Greg Hjelstrom                                               *
 *                                                                                             *
 *                     $Modtime:: 8/24/01 5:07p                                               $*
 *                                                                                             *
 *                    $Revision:: 7                                                           $*
 *                                                                                             *
 *---------------------------------------------------------------------------------------------*
 * Functions:                                                                                  *
 *   LZOCompressor::Compress -- compress a buffer using LZO                                    *
 *   LZOCompressor::Decompress -- decompress a buffer using LZO                                *
 * - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
 
#include "lzo.h"
#include "mutex.h"
#include "wwdebug.h"
#include <stdlib.h>
 
/*
** Work Buffer for the LZOCompressor...
*/
lzo_byte        LZOCompressor::WorkBuffer[LZO1X_MEM_COMPRESS + 1];
lzo_byte *  LZOCompressor::EOWorkBuffer = &(LZOCompressor::WorkBuffer[LZO1X_MEM_COMPRESS + 1]);
 
static CriticalSectionClass mutex;
 
#define BUFFER_OVERRUN_TEST_VALUE   ((char)0x7d)
 
 
/***********************************************************************************************
 * LZOCompressor::Compress -- compress a buffer using LZO                                      *
 *                                                                                             *
 * INPUT:                                                                                      *
 *                                                                                             *
 * OUTPUT:                                                                                     *
 *                                                                                             *
 * WARNINGS:                                                                                   *
 *                                                                                             *
 * HISTORY:                                                                                    *
 *   7/19/99    GTH : Created.                                                                 *
 *=============================================================================================*/
int LZOCompressor::Compress
(
    const lzo_byte * in,
    lzo_uint in_len,
    lzo_byte * out,
    lzo_uint * out_len
)
{
    CriticalSectionClass::LockClass m(mutex);
 
#ifdef WWDEBUG
    // Debugging code to verify that the work buffer is not overrun...
    *EOWorkBuffer = BUFFER_OVERRUN_TEST_VALUE;
#endif
 
    int result = lzo1x_1_compress(in,in_len,out,out_len,WorkBuffer);
 
#ifdef WWDEBUG
    WWASSERT(*EOWorkBuffer == BUFFER_OVERRUN_TEST_VALUE);
#endif
 
    return result;
}
 
 
/***********************************************************************************************
 * LZOCompressor::Decompress -- decompress a buffer using LZO                                  *
 *                                                                                             *
 * INPUT:                                                                                      *
 *                                                                                             *
 * OUTPUT:                                                                                     *
 *                                                                                             *
 * WARNINGS:                                                                                   *
 *                                                                                             *
 * HISTORY:                                                                                    *
 *   7/19/99    GTH : Created.                                                                 *
 *=============================================================================================*/
int LZOCompressor::Decompress
(
    const lzo_byte * in,
    lzo_uint in_len,
    lzo_byte * out,
    lzo_uint * out_len
)
{
    CriticalSectionClass::LockClass m(mutex);
 
    return lzo1x_decompress(in,in_len,out,out_len,NULL);
}