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
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
|
/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* compressor.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#define SQFS_BUILDING_DLL
#include "config.h"
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include "internal.h"
#include "util.h"
typedef sqfs_compressor_t *(*compressor_fun_t)
(const sqfs_compressor_config_t *cfg);
static compressor_fun_t compressors[SQFS_COMP_MAX + 1] = {
#ifdef WITH_GZIP
[SQFS_COMP_GZIP] = gzip_compressor_create,
#endif
#ifdef WITH_XZ
[SQFS_COMP_XZ] = xz_compressor_create,
#endif
#ifdef WITH_LZO
[SQFS_COMP_LZO] = lzo_compressor_create,
#endif
#ifdef WITH_LZ4
[SQFS_COMP_LZ4] = lz4_compressor_create,
#endif
#ifdef WITH_ZSTD
[SQFS_COMP_ZSTD] = zstd_compressor_create,
#endif
};
static const char *names[] = {
[SQFS_COMP_GZIP] = "gzip",
[SQFS_COMP_LZMA] = "lzma",
[SQFS_COMP_LZO] = "lzo",
[SQFS_COMP_XZ] = "xz",
[SQFS_COMP_LZ4] = "lz4",
[SQFS_COMP_ZSTD] = "zstd",
};
int sqfs_generic_write_options(int fd, const void *data, size_t size)
{
uint8_t buffer[size + 2];
*((uint16_t *)buffer) = htole16(0x8000 | size);
memcpy(buffer + 2, data, size);
if (write_data("writing compressor options",
fd, buffer, sizeof(buffer))) {
return -1;
}
return sizeof(buffer);
}
int sqfs_generic_read_options(int fd, void *data, size_t size)
{
uint8_t buffer[size + 2];
if (read_data_at("reading compressor options", sizeof(sqfs_super_t),
fd, buffer, sizeof(buffer))) {
return -1;
}
if (le16toh(*((uint16_t *)buffer)) != (0x8000 | size)) {
fputs("reading compressor options: invalid meta data header\n",
stderr);
return -1;
}
memcpy(data, buffer + 2, size);
return 0;
}
bool sqfs_compressor_exists(E_SQFS_COMPRESSOR id)
{
if (id < SQFS_COMP_MIN || id > SQFS_COMP_MAX)
return false;
return (compressors[id] != NULL);
}
sqfs_compressor_t *sqfs_compressor_create(const sqfs_compressor_config_t *cfg)
{
if (cfg == NULL || cfg->id < SQFS_COMP_MIN || cfg->id > SQFS_COMP_MAX)
return NULL;
if (compressors[cfg->id] == NULL)
return NULL;
return compressors[cfg->id](cfg);
}
const char *sqfs_compressor_name_from_id(E_SQFS_COMPRESSOR id)
{
if (id < 0 || (size_t)id >= sizeof(names) / sizeof(names[0]))
return NULL;
return names[id];
}
int sqfs_compressor_id_from_name(const char *name, E_SQFS_COMPRESSOR *out)
{
size_t i;
for (i = 0; i < sizeof(names) / sizeof(names[0]); ++i) {
if (names[i] != NULL && strcmp(names[i], name) == 0) {
*out = i;
return 0;
}
}
return -1;
}
int sqfs_compressor_config_init(sqfs_compressor_config_t *cfg,
E_SQFS_COMPRESSOR id,
size_t block_size, uint16_t flags)
{
memset(cfg, 0, sizeof(*cfg));
cfg->id = id;
cfg->flags = flags;
cfg->block_size = block_size;
switch (id) {
case SQFS_COMP_GZIP:
cfg->opt.gzip.level = SQFS_GZIP_DEFAULT_LEVEL;
cfg->opt.gzip.window_size = SQFS_GZIP_DEFAULT_WINDOW;
break;
case SQFS_COMP_LZO:
cfg->opt.lzo.algorithm = SQFS_LZO_DEFAULT_ALG;
cfg->opt.lzo.level = SQFS_LZO_DEFAULT_LEVEL;
break;
case SQFS_COMP_ZSTD:
cfg->opt.zstd.level = SQFS_ZSTD_DEFAULT_LEVEL;
break;
case SQFS_COMP_XZ:
cfg->opt.xz.dict_size = block_size;
break;
default:
break;
}
return 0;
}
|
