/* simple.c -- the annotated simple example program for the LZO library   This file is part of the LZO real-time data compression library.   Copyright (C) 1996-2002 Markus Franz Xaver Johannes Oberhumer   All Rights Reserved.   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.com> *//*************************************************************************// This program shows the basic usage of the LZO library.// We will compress a block of data and decompress again.//// See also LZO.FAQ**************************************************************************//* We will be using the LZO1X-1 algorithm, so we have * to include <lzo1x.h> */#include <lzo1x.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. */#ifndef IN_LEN#define IN_LEN		(128*1024L)#endif#define OUT_LEN		(IN_LEN + IN_LEN / 64 + 16 + 3)/*************************************************************************//**************************************************************************/#include "lutil.h"int main(int argc, char *argv[]){	int r;	lzo_byte *in;	lzo_byte *out;	lzo_byte *wrkmem;	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) 1996-2002 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 4;	}/* * Step 2: allocate blocks and the work-memory */	in = (lzo_bytep) lzo_malloc(IN_LEN);	out = (lzo_bytep) lzo_malloc(OUT_LEN);	wrkmem = (lzo_bytep) lzo_malloc(LZO1X_1_MEM_COMPRESS);	if (in == NULL || out == NULL || wrkmem == NULL)	{		printf("out of memory\n");		return 3;	}/* * Step 3: 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 4: 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 5: 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;	}	lzo_free(wrkmem);	lzo_free(out);	lzo_free(in);	printf("Simple compression test passed.\n");	return 0;}/*vi:ts=4*/