/* testmini.c -- very simple test program for the miniLZO library

   This file is part of the LZO real-time data compression library.

   Copyright (C) 1999 Markus Franz Xaver Johannes Oberhumer
   Copyright (C) 1998 Markus Franz Xaver Johannes Oberhumer
   Copyright (C) 1997 Markus Franz Xaver Johannes Oberhumer
   Copyright (C) 1996 Markus Franz Xaver Johannes Oberhumer

   The LZO library 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.

   The LZO library 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 the LZO library; see the file COPYING.
   If not, write to the Free Software Foundation, Inc.,
   59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

   Markus F.X.J. Oberhumer
   markus.oberhumer@jk.uni-linz.ac.at
 */


#include <stdio.h>
#include <stdlib.h>


/*************************************************************************
// This program shows the basic usage of the LZO library.
// We will compress a block of data and decompress again.
//
// For more information, documentation, example programs and other support
// files (like Makefiles and build scripts) please download the full LZO
// package from
//    http://wildsau.idv.uni-linz.ac.at/mfx/lzo.html
**************************************************************************/

/* First let's include "minizo.h". */

#include "minilzo.h"


/* We want to compress the data block at `in' with length `IN_LEN' to
 * the block at `out'. Because the input block may be incompressible,
 * we must provide a little more output space in case that compression
 * is not possible.
 */

#define IN_LEN		(128*1024L)
#define OUT_LEN		(IN_LEN + IN_LEN / 64 + 16 + 3)

static lzo_byte in  [ IN_LEN ];
static lzo_byte out [ OUT_LEN ];


/* Work-memory needed for compression. Allocate memory in units
 * of `long' (instead of `char') to make sure it is properly aligned.
 */

#define HEAP_ALLOC(var,size) \
	long __LZO_MMODEL var [ ((size) + (sizeof(long) - 1)) / sizeof(long) ]

static HEAP_ALLOC(wrkmem,LZO1X_1_MEM_COMPRESS);


/*************************************************************************
//
**************************************************************************/

int main(int argc, char *argv[])
{
	int r;
	lzo_uint in_len;
	lzo_uint out_len;
	lzo_uint new_len;

#if defined(__EMX__)
	_response(&argc,&argv);
	_wildcard(&argc,&argv);
#endif

	if (argc < 0 && argv == NULL)	/* avoid warning about unused args */
		return 0;

	printf("\nLZO real-time data compression library (v%s, %s).\n",
	        LZO_VERSION_STRING, LZO_VERSION_DATE);
	printf("Copyright (C) 1996, 1997, 1998 Markus Franz Xaver Johannes Oberhumer\n\n");


/*
 * Step 1: initialize the LZO library
 */
	if (lzo_init() != LZO_E_OK)
	{
		printf("lzo_init() failed !!!\n");
		return 3;
	}

/*
 * Step 2: prepare the input block that will get compressed.
 *         We just fill it with zeros in this example program,
 *         but you would use your real-world data here.
 */
	in_len = IN_LEN;
	lzo_memset(in,0,in_len);

/*
 * Step 3: compress from `in' to `out' with LZO1X-1
 */
	r = lzo1x_1_compress(in,in_len,out,&out_len,wrkmem);
	if (r == LZO_E_OK)
		printf("compressed %lu bytes into %lu bytes\n",
			(long) in_len, (long) out_len);
	else
	{
		/* this should NEVER happen */
		printf("internal error - compression failed: %d\n", r);
		return 2;
	}
	/* check for an incompressible block */
	if (out_len >= in_len)
	{
		printf("This block contains incompressible data.\n");
		return 0;
	}

/*
 * Step 4: decompress again, now going from `out' to `in'
 */
	r = lzo1x_decompress(out,out_len,in,&new_len,NULL);
	if (r == LZO_E_OK && new_len == in_len)
		printf("decompressed %lu bytes back into %lu bytes\n",
			(long) out_len, (long) in_len);
	else
	{
		/* this should NEVER happen */
		printf("internal error - decompression failed: %d\n", r);
		return 1;
	}

	printf("\nminiLZO simple compression test passed.\n");
	return 0;
}

/*
vi:ts=4
*/