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/*
* Copyright (C) 2017-2023 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 <lz4.h>
#include <lz4hc.h>
#include "logging.h"
#include "compress_model.h"
#ifdef LZ4HC_CLEVEL_DEFAULT
#define KNET_COMPRESS_DEFAULT LZ4HC_CLEVEL_DEFAULT /* lz4hc default compression level from lz4hc.h */
#else
#define KNET_COMPRESS_DEFAULT KNET_COMPRESS_UNKNOWN_DEFAULT
#endif
#ifdef LZ4HC_CLEVEL_MAX
#define KNET_LZ4HC_MAX LZ4HC_CLEVEL_MAX
#endif
#ifdef LZ4HC_MAX_CLEVEL
#define KNET_LZ4HC_MAX LZ4HC_MAX_CLEVEL
#endif
#ifndef KNET_LZ4HC_MAX
/*
* older releases of lz4 do not define LZ4HC_CLEVEL range.
* According to lz4hc.h, any value between 0 and 16 is valid.
* We defalt to 16 based on the comments in the include file
* from older versions.
*/
#define KNET_LZ4HC_MAX 16
#endif
static int lz4hc_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 lzerr = 0, err = 0;
int savederrno = 0;
lzerr = LZ4_compress_HC((const char *)buf_in, (char *)buf_out, buf_in_len, KNET_DATABUFSIZE_COMPRESS, knet_h->compress_level);
/*
* data compressed
*/
if (lzerr > 0) {
*buf_out_len = lzerr;
}
/*
* unable to compress
*/
if (lzerr <= 0) {
log_err(knet_h, KNET_SUB_LZ4HCCOMP, "lz4hc compression error: %d", lzerr);
savederrno = EINVAL;
err = -1;
}
errno = savederrno;
return err;
}
/* This is a straight copy from compress_lz4.c */
static int lz4_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 lzerr = 0, err = 0;
int savederrno = 0;
lzerr = LZ4_decompress_safe((const char *)buf_in, (char *)buf_out, buf_in_len, KNET_DATABUFSIZE);
if (lzerr < 0) {
log_err(knet_h, KNET_SUB_LZ4COMP, "lz4 decompression error: %d", lzerr);
savederrno = EINVAL;
err = -1;
}
if (lzerr > 0) {
*buf_out_len = lzerr;
}
errno = savederrno;
return err;
}
static int lz4hc_get_default_level()
{
return KNET_COMPRESS_DEFAULT;
}
compress_ops_t compress_model = {
KNET_COMPRESS_MODEL_ABI,
NULL,
NULL,
NULL,
NULL,
lz4hc_compress,
lz4_decompress,
lz4hc_get_default_level
};

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