Zabbix

/*

** Copyright (C) 2001-2025 Zabbix SIA

**

** This program is free software: you can redistribute it and/or modify it under the terms of

** the GNU Affero General Public License as published by the Free Software Foundation, version 3.

**

** 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 Affero General Public License for more details.

**

** You should have received a copy of the GNU Affero General Public License along with this program.

** If not, see <https://www.gnu.org/licenses/>.

**/

​

#include "zbxcompress.h"

​

#include "zbxcommon.h"

​

#ifdef HAVE_ZLIB

#include "zlib.h"

​

#define ZBX_COMPRESS_STRERROR_LEN   512

​

static int  zbx_zlib_errno = 0;

​

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

 *                                                                            *

 * Purpose: returns last conversion error message                             *

 *                                                                            *

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

const char  *zbx_compress_strerror(void)

{

    static char message[ZBX_COMPRESS_STRERROR_LEN];

​

    switch (zbx_zlib_errno)

    {

        case Z_ERRNO:

            zbx_strlcpy(message, zbx_strerror(errno), sizeof(message));

            break;

        case Z_MEM_ERROR:

            zbx_strlcpy(message, "not enough memory", sizeof(message));

            break;

        case Z_BUF_ERROR:

            zbx_strlcpy(message, "not enough space in output buffer", sizeof(message));

            break;

        case Z_DATA_ERROR:

            zbx_strlcpy(message, "corrupted input data", sizeof(message));

            break;

        default:

            zbx_snprintf(message, sizeof(message), "unknown error (%d)", zbx_zlib_errno);

            break;

    }

​

    return message;

}

​

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

 *                                                                            *

 * Purpose: compress data                                                     *

 *                                                                            *

 * Parameters: in       - [IN] the data to compress                           *

 *             size_in  - [IN] the input data size                            *

 *             out      - [OUT] the compressed data                           *

 *             size_out - [OUT] the compressed data size                      *

 *                                                                            *

 * Return value: SUCCEED - the data was compressed successfully               *

 *               FAIL    - otherwise                                          *

 *                                                                            *

 * Comments: In the case of success the output buffer must be freed by the    *

 *           caller.                                                          *

 *                                                                            *

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

int zbx_compress(const char *in, size_t size_in, char **out, size_t *size_out)

{

    Bytef   *buf;

    uLongf  buf_size;

​

    buf_size = compressBound(size_in);

    buf = (Bytef *)zbx_malloc(NULL, buf_size);

​

    if (Z_OK != (zbx_zlib_errno = compress(buf, &buf_size, (const Bytef *)in, size_in)))

    {

        zbx_free(buf);

        return FAIL;

    }

​

    *out = (char *)buf;

    *size_out = buf_size;

​

    return SUCCEED;

}