1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * erofs-utils/lib/compressor-lz4hc.c
4 *
5 * Copyright (C) 2018-2019 HUAWEI, Inc.
6 * http://www.huawei.com/
7 * Created by Gao Xiang <gaoxiang25@huawei.com>
8 */
9 #define LZ4_HC_STATIC_LINKING_ONLY (1)
10 #include <lz4hc.h>
11 #include "erofs/internal.h"
12 #include "compressor.h"
13
lz4hc_compress_destsize(struct erofs_compress * c,int compression_level,void * src,unsigned int * srcsize,void * dst,unsigned int dstsize)14 static int lz4hc_compress_destsize(struct erofs_compress *c,
15 int compression_level,
16 void *src,
17 unsigned int *srcsize,
18 void *dst,
19 unsigned int dstsize)
20 {
21 int srcSize = (int)*srcsize;
22 int rc = LZ4_compress_HC_destSize(c->private_data, src, dst,
23 &srcSize, (int)dstsize,
24 compression_level);
25 if (!rc)
26 return -EFAULT;
27 *srcsize = srcSize;
28 return rc;
29 }
30
compressor_lz4hc_exit(struct erofs_compress * c)31 static int compressor_lz4hc_exit(struct erofs_compress *c)
32 {
33 if (!c->private_data)
34 return -EINVAL;
35
36 LZ4_freeStreamHC(c->private_data);
37 return 0;
38 }
39
compressor_lz4hc_init(struct erofs_compress * c)40 static int compressor_lz4hc_init(struct erofs_compress *c)
41 {
42 c->alg = &erofs_compressor_lz4hc;
43
44 c->private_data = LZ4_createStreamHC();
45 if (!c->private_data)
46 return -ENOMEM;
47 return 0;
48 }
49
50 struct erofs_compressor erofs_compressor_lz4hc = {
51 .name = "lz4hc",
52 .default_level = LZ4HC_CLEVEL_DEFAULT,
53 .best_level = LZ4HC_CLEVEL_MAX,
54 .init = compressor_lz4hc_init,
55 .exit = compressor_lz4hc_exit,
56 .compress_destsize = lz4hc_compress_destsize,
57 };
58
59