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/*
* Copyright (C) 2017-2026 Red Hat, Inc. All rights reserved.
*
* Author: Fabio M. Di Nitto <fabbione@kronosnet.org>
*
* This software licensed under LGPL-2.0+
*/
#define KNET_MODULE
#include "config.h"
#include <errno.h>
#include <zlib.h>
#include "logging.h"
#include "compress_model.h"
#ifdef Z_DEFAULT_COMPRESSION
#define KNET_COMPRESS_DEFAULT Z_DEFAULT_COMPRESSION /* zlib default compression level from zlib.h */
#else
#define KNET_COMPRESS_DEFAULT KNET_COMPRESS_UNKNOWN_DEFAULT
#endif
static int zlib_compress(
knet_handle_t knet_h,
const unsigned char *buf_in,
const ssize_t buf_in_len,
unsigned char *buf_out,
ssize_t *buf_out_len)
{
int zerr = 0, err = 0;
int savederrno = 0;
uLongf destLen = *buf_out_len;
zerr = compress2(buf_out, &destLen,
buf_in, buf_in_len,
knet_h->compress_level);
*buf_out_len = destLen;
switch(zerr) {
case Z_OK:
err = 0;
savederrno = 0;
break;
case Z_MEM_ERROR:
log_err(knet_h, KNET_SUB_ZLIBCOMP, "zlib compress mem error");
err = -1;
savederrno = ENOMEM;
break;
case Z_BUF_ERROR:
log_err(knet_h, KNET_SUB_ZLIBCOMP, "zlib compress buf error");
err = -1;
savederrno = ENOBUFS;
break;
case Z_STREAM_ERROR:
log_err(knet_h, KNET_SUB_ZLIBCOMP, "zlib compress stream error");
err = -1;
savederrno = EINVAL;
break;
default:
log_err(knet_h, KNET_SUB_ZLIBCOMP, "zlib unknown compress error: %d", zerr);
break;
}
errno = savederrno;
return err;
}
static int zlib_decompress(
knet_handle_t knet_h,
const unsigned char *buf_in,
const ssize_t buf_in_len,
unsigned char *buf_out,
ssize_t *buf_out_len)
{
int zerr = 0, err = 0;
int savederrno = 0;
uLongf destLen = *buf_out_len;
zerr = uncompress(buf_out, &destLen,
buf_in, buf_in_len);
*buf_out_len = destLen;
switch(zerr) {
case Z_OK:
err = 0;
savederrno = 0;
break;
case Z_MEM_ERROR:
log_err(knet_h, KNET_SUB_ZLIBCOMP, "zlib decompress mem error");
err = -1;
savederrno = ENOMEM;
break;
case Z_BUF_ERROR:
log_err(knet_h, KNET_SUB_ZLIBCOMP, "zlib decompress buf error");
err = -1;
savederrno = ENOBUFS;
break;
case Z_DATA_ERROR:
log_err(knet_h, KNET_SUB_ZLIBCOMP, "zlib decompress data error");
err = -1;
savederrno = EINVAL;
break;
default:
log_err(knet_h, KNET_SUB_ZLIBCOMP, "zlib unknown decompress error: %d", zerr);
break;
}
errno = savederrno;
return err;
}
static int zlib_get_default_level()
{
return KNET_COMPRESS_DEFAULT;
}
compress_ops_t compress_model = {
KNET_COMPRESS_MODEL_ABI,
NULL,
NULL,
NULL,
NULL,
zlib_compress,
zlib_decompress,
zlib_get_default_level
};
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