proggen.org

Code: Alles auswählen

#include "lzo/lzoconf.h"
#include "lzo/lzo1x.h"

/* portability layer */
static const char *progname = NULL;
#define WANT_LZO_MALLOC 1
#define WANT_XMALLOC 1
#include "examples/portab.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 / 16 + 64 + 3)


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

int __lzo_cdecl_main main(int argc, char *argv[])
{
    int r;
    lzo_bytep in;
    lzo_bytep out;
    lzo_voidp wrkmem;
    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) 1996-2010 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 4;
    }

/*
 * Step 2: allocate blocks and the work-memory
 */
    in = (lzo_bytep) xmalloc(IN_LEN);
    out = (lzo_bytep) xmalloc(OUT_LEN);
    wrkmem = (lzo_voidp) xmalloc(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",
            (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;
    }

    lzo_free(wrkmem);
    lzo_free(out);
    lzo_free(in);
    printf("Simple compression test passed.\n");
    return 0;
}