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

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

   Copyright (C) 1996-2014 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.,

   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.

   Markus F.X.J. Oberhumer

   <markus@oberhumer.com>

   http://www.oberhumer.com/opensource/lzo/

 */

#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://www.oberhumer.com/opensource/lzo/

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

/* 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*1024ul)

#define OUT_LEN     (IN_LEN + IN_LEN / 16 + 64 + 3)

static unsigned char __LZO_MMODEL in  [ IN_LEN ];

static unsigned char __LZO_MMODEL out [ OUT_LEN ];

/* Work-memory needed for compression. Allocate memory in units

 * of 'lzo_align_t' (instead of 'char') to make sure it is properly aligned.

 */

#define HEAP_ALLOC(var,size) \

    lzo_align_t __LZO_MMODEL var [ ((size) + (sizeof(lzo_align_t) - 1)) / sizeof(lzo_align_t) ]

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 (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) 1996-2014 Markus Franz Xaver Johannes Oberhumer\nAll Rights Reserved.\n\n");

/*

 * Step 1: initialize the LZO library

 */

    if (lzo_init() != LZO_E_OK)

    {

        printf("internal error - lzo_init() failed !!!\n");

        printf("(this usually indicates a compiler bug - try recompiling\nwithout optimizations, and enable '-DLZO_DEBUG' for diagnostics)\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",

            (unsigned long) in_len, (unsigned 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'

 */

    new_len = in_len;

    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",

            (unsigned long) out_len, (unsigned 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:et

*/