1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
|
// SPDX-License-Identifier: GPL-2.0+ OR Apache-2.0
/*
* Copyright (C) 2018-2019 HUAWEI, Inc.
* http://www.huawei.com/
* Created by Gao Xiang <xiang@kernel.org>
*/
#include <lz4.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 lz4_compress_destsize(const struct erofs_compress *c,
const void *src, unsigned int *srcsize,
void *dst, unsigned int dstsize)
{
int srcSize = (int)*srcsize;
int rc = LZ4_compress_destSize(src, dst, &srcSize, (int)dstsize);
if (!rc)
return -EFAULT;
*srcsize = srcSize;
return rc;
}
static int compressor_lz4_exit(struct erofs_compress *c)
{
return 0;
}
static int compressor_lz4_init(struct erofs_compress *c)
{
c->sbi->lz4.max_distance = max_t(u16, c->sbi->lz4.max_distance,
LZ4_DISTANCE_MAX);
return 0;
}
const struct erofs_compressor erofs_compressor_lz4 = {
.init = compressor_lz4_init,
.exit = compressor_lz4_exit,
.compress_destsize = lz4_compress_destsize,
};
|
