/*
 * 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
 */


/*
	Example block compression routine for interfacing with DACT.

	This does no compression.

	(This is used as the minimum case, so block can be atmost blk_size
	+3 bytes in size)
*/


#include "dact.h"
#include "comp_plain.h"
#include <stdio.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_STRING_H
#include <string.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.
*/
int comp_plain_algo(int mode, unsigned char *prev_block, unsigned char *curr_block, char *out_block, int blk_size) {
	switch(mode) {
		case DACT_MODE_COMPR:
			return(comp_plain_compress(prev_block,curr_block,out_block,blk_size));
			break; /* Heh */
		case DACT_MODE_DECMP:
			return(comp_plain_decompress(prev_block,curr_block,out_block,blk_size));
			break;
		default:
			printf("Unsupported mode: %i\n", mode);
			return(-1);
	}
}

int comp_plain_compress(unsigned char *prev_block, unsigned char *curr_block, char *out_block, int blk_size) {
	memcpy(out_block,curr_block,blk_size);
	return(blk_size);
}

int comp_plain_decompress(unsigned char *prev_block, unsigned char *curr_block, char *out_block, int blk_size) {
	memcpy(out_block,curr_block,blk_size);
	return(blk_size);
}
