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comp_lzota.c

/*
 * Copyright (C) 2001, 2002, and 2003  Roy Keene
 *
 * 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 2
 * 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 *      email: dact@rkeene.org
 */


#include "dact.h"
#include "comp_lzota.h"
#ifndef comp_lzota_algo
#include <lzoconf.h>
#include <lzo2a.h>
#include <stdio.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif


/*
      mode        - DACT_MODE_COMPR or DACT_MODE_DECMP
                      Determine whether to compress or decompress.
      prev_block  - Previous (uncompressed) block.
      curr_block  - The data to be compressed.
      out_block   - Where to put data after compression.
      blk_size    - Size of prev_block and curr_block.
*/

#if defined(AS_MODULE) && defined(USE_MODULES)
#include "module.h"
uint32_t DC_NUM=15;
uint32_t DC_TYPE=DACT_MOD_TYPE_COMP;
void *DC_ALGO=comp_lzota_algo;
char *DC_NAME="LZO-2a Compression (MOD)";
/*
char *DC_SIGN="RGlnaXRhbFNpZ25hdHVyZQ==";
char *DC_URL_GET="http://www.rkeene.org/projects/compression/dact/@@OSNM@@-@@ARCH@@/comp_rle.dll";
char *DC_URL_VER="http://www.rkeene.org/projects/compression/dact/@@OSNM@@-@@ARCH@@/comp_rle.ver";
uint32_t DC_VER=0x00080d;
uint32_t DC_REQUIRE=DACT_MOD_REQ_ATLEAST|(0x00080d);
*/
#endif

int comp_lzota_algo(int mode, unsigned char *prev_block, unsigned char *curr_block, char *out_block, int blk_size, int bufsize) {
      switch(mode) {
            case DACT_MODE_COMPR:
                  return(comp_lzota_compress(prev_block, curr_block, out_block, blk_size, bufsize));
                  break; /* Heh */
            case DACT_MODE_DECMP:
                  return(comp_lzota_decompress(prev_block, curr_block, out_block, blk_size, bufsize));
                  break;
            default:
                  printf("Unsupported mode: %i\n", mode);
                  return(-1);
      }
}

int comp_lzota_compress(unsigned char *prev_block, unsigned char *curr_block, char *out_block, int blk_size, int bufsize) {
      int retsize=0;
      char *wrkmem;

      if ((wrkmem=malloc(LZO2A_999_MEM_COMPRESS))==NULL) return(-1);
      if (lzo_init()!=LZO_E_OK) return(-1);
      lzo2a_999_compress(curr_block, blk_size, out_block, &retsize, wrkmem);
      free(wrkmem);
      return(retsize);
}

int comp_lzota_decompress(unsigned char *prev_block, unsigned char *curr_block, char *out_block, int blk_size, int bufsize) {
      int retsize=0, retval;

      if (lzo_init()!=LZO_E_OK) return(-1);
      retval=lzo2a_decompress(curr_block, blk_size, out_block, &retsize, NULL);
      if (retval!=LZO_E_OK) return(-1);
      return(retsize);
}
#endif

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