blob: 0c912fb0ea1e8081806269248b9b302a4631136d [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2018-2019 HUAWEI, Inc.
* http://www.huawei.com/
* Created by Gao Xiang <gaoxiang25@huawei.com>
*/
#define LZ4_HC_STATIC_LINKING_ONLY (1)
#include <lz4hc.h>
#include "erofs/internal.h"
#include "compressor.h"
#ifndef LZ4_DISTANCE_MAX /* history window size */
#define LZ4_DISTANCE_MAX 65535 /* set to maximum value by default */
#endif
static int lz4hc_compress_destsize(struct erofs_compress *c,
int compression_level,
void *src,
unsigned int *srcsize,
void *dst,
unsigned int dstsize)
{
int srcSize = (int)*srcsize;
int rc = LZ4_compress_HC_destSize(c->private_data, src, dst,
&srcSize, (int)dstsize,
compression_level);
if (!rc)
return -EFAULT;
*srcsize = srcSize;
return rc;
}
static int compressor_lz4hc_exit(struct erofs_compress *c)
{
if (!c->private_data)
return -EINVAL;
LZ4_freeStreamHC(c->private_data);
return 0;
}
static int compressor_lz4hc_init(struct erofs_compress *c)
{
c->alg = &erofs_compressor_lz4hc;
c->private_data = LZ4_createStreamHC();
if (!c->private_data)
return -ENOMEM;
sbi.lz4_max_distance = LZ4_DISTANCE_MAX;
return 0;
}
struct erofs_compressor erofs_compressor_lz4hc = {
.name = "lz4hc",
.default_level = LZ4HC_CLEVEL_DEFAULT,
.best_level = LZ4HC_CLEVEL_MAX,
.init = compressor_lz4hc_init,
.exit = compressor_lz4hc_exit,
.compress_destsize = lz4hc_compress_destsize,
};