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
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
|
/* SPDX-License-Identifier: GPL-3.0-or-later */
#ifndef SQUASHFS_H
#define SQUASHFS_H
#include <stdbool.h>
#include <stdint.h>
#include <stddef.h>
#define SQFS_MAGIC 0x73717368
#define SQFS_VERSION_MAJOR 4
#define SQFS_VERSION_MINOR 0
#define SQFS_META_BLOCK_SIZE 8192
#define SQFS_DEFAULT_BLOCK_SIZE 131072
#define SQFS_DEVBLK_SIZE 4096
#define SQFS_MAX_DIR_ENT 256
typedef struct {
uint32_t magic;
uint32_t inode_count;
uint32_t modification_time;
uint32_t block_size;
uint32_t fragment_entry_count;
uint16_t compression_id;
uint16_t block_log;
uint16_t flags;
uint16_t id_count;
uint16_t version_major;
uint16_t version_minor;
uint64_t root_inode_ref;
uint64_t bytes_used;
uint64_t id_table_start;
uint64_t xattr_id_table_start;
uint64_t inode_table_start;
uint64_t directory_table_start;
uint64_t fragment_table_start;
uint64_t export_table_start;
} __attribute__((packed)) sqfs_super_t;
typedef struct {
uint64_t start_offset;
uint32_t size;
uint32_t pad0;
} sqfs_fragment_t;
typedef struct {
uint16_t type;
uint16_t mode;
uint16_t uid_idx;
uint16_t gid_idx;
uint32_t mod_time;
uint32_t inode_number;
} sqfs_inode_t;
typedef struct {
uint32_t nlink;
uint32_t devno;
} sqfs_inode_dev_t;
typedef struct {
uint32_t nlink;
uint32_t devno;
uint32_t xattr_idx;
} sqfs_inode_dev_ext_t;
typedef struct {
uint32_t nlink;
} sqfs_inode_ipc_t;
typedef struct {
uint32_t nlink;
uint32_t xattr_idx;
} sqfs_inode_ipc_ext_t;
typedef struct {
uint32_t nlink;
uint32_t target_size;
/*uint8_t target[];*/
} sqfs_inode_slink_t;
typedef struct {
uint32_t nlink;
uint32_t target_size;
/*uint8_t target[];*/
uint32_t xattr_idx;
} sqfs_inode_slink_ext_t;
typedef struct {
uint32_t blocks_start;
uint32_t fragment_index;
uint32_t fragment_offset;
uint32_t file_size;
/*uint32_t block_sizes[];*/
} sqfs_inode_file_t;
typedef struct {
uint64_t blocks_start;
uint64_t file_size;
uint64_t sparse;
uint32_t nlink;
uint32_t fragment_idx;
uint32_t fragment_offset;
uint32_t xattr_idx;
/*uint32_t block_sizes[];*/
} sqfs_inode_file_ext_t;
typedef struct {
uint32_t start_block;
uint32_t nlink;
uint16_t size;
uint16_t offset;
uint32_t parent_inode;
} sqfs_inode_dir_t;
typedef struct {
uint32_t nlink;
uint32_t size;
uint32_t start_block;
uint32_t parent_inode;
uint16_t inodex_count;
uint16_t offset;
uint32_t xattr_idx;
} sqfs_inode_dir_ext_t;
typedef struct {
sqfs_inode_t base;
char *slink_target;
uint32_t *block_sizes;
union {
sqfs_inode_dev_t dev;
sqfs_inode_dev_ext_t dev_ext;
sqfs_inode_ipc_t ipc;
sqfs_inode_ipc_ext_t ipc_ext;
sqfs_inode_slink_t slink;
sqfs_inode_slink_ext_t slink_ext;
sqfs_inode_file_t file;
sqfs_inode_file_ext_t file_ext;
sqfs_inode_dir_t dir;
sqfs_inode_dir_ext_t dir_ext;
} data;
uint8_t extra[];
} sqfs_inode_generic_t;
typedef struct {
uint32_t count;
uint32_t start_block;
uint32_t inode_number;
} sqfs_dir_header_t;
typedef struct {
uint16_t offset;
uint16_t inode_number;
uint16_t type;
uint16_t size;
uint8_t name[];
} sqfs_dir_entry_t;
typedef struct {
uint32_t index;
uint32_t start_block;
uint32_t size;
uint8_t name[];
} sqfs_dir_index_t;
typedef struct {
uint16_t type;
uint16_t size;
uint8_t key[];
} sqfs_xattr_entry_t;
typedef struct {
uint32_t size;
uint8_t value[];
} sqfs_xattr_value_t;
typedef struct {
uint64_t xattr;
uint32_t count;
uint32_t size;
} sqfs_xattr_id_t;
typedef struct {
uint64_t xattr_table_start;
uint32_t xattr_ids;
uint32_t unused;
} sqfs_xattr_id_table_t;
typedef enum {
SQFS_COMP_GZIP = 1,
SQFS_COMP_LZMA = 2,
SQFS_COMP_LZO = 3,
SQFS_COMP_XZ = 4,
SQFS_COMP_LZ4 = 5,
SQFS_COMP_ZSTD = 6,
SQFS_COMP_MIN = 1,
SQFS_COMP_MAX = 6,
} E_SQFS_COMPRESSOR;
typedef enum {
SQFS_FLAG_UNCOMPRESSED_INODES = 0x0001,
SQFS_FLAG_UNCOMPRESSED_DATA = 0x0002,
SQFS_FLAG_UNCOMPRESSED_FRAGMENTS = 0x0008,
SQFS_FLAG_NO_FRAGMENTS = 0x0010,
SQFS_FLAG_ALWAYS_FRAGMENTS = 0x0020,
SQFS_FLAG_DUPLICATES = 0x0040,
SQFS_FLAG_EXPORTABLE = 0x0080,
SQFS_FLAG_UNCOMPRESSED_XATTRS = 0x0100,
SQFS_FLAG_NO_XATTRS = 0x0200,
SQFS_FLAG_COMPRESSOR_OPTIONS = 0x0400,
SQFS_FLAG_UNCOMPRESSED_IDS = 0x0800,
} E_SQFS_SUPER_FLAGS;
typedef enum {
SQFS_INODE_DIR = 1,
SQFS_INODE_FILE = 2,
SQFS_INODE_SLINK = 3,
SQFS_INODE_BDEV = 4,
SQFS_INODE_CDEV = 5,
SQFS_INODE_FIFO = 6,
SQFS_INODE_SOCKET = 7,
SQFS_INODE_EXT_DIR = 8,
SQFS_INODE_EXT_FILE = 9,
SQFS_INODE_EXT_SLINK = 10,
SQFS_INODE_EXT_BDEV = 11,
SQFS_INODE_EXT_CDEV = 12,
SQFS_INODE_EXT_FIFO = 13,
SQFS_INODE_EXT_SOCKET = 14,
} E_SQFS_INODE_TYPE;
typedef enum {
SQUASHFS_XATTR_USER = 0,
SQUASHFS_XATTR_TRUSTED = 1,
SQUASHFS_XATTR_SECURITY = 2,
SQUASHFS_XATTR_FLAG_OOL = 0x100,
SQUASHFS_XATTR_PREFIX_MASK = 0xFF,
} E_SQFS_XATTR_TYPE;
/* Returns 0 on success. Prints error messages to stderr on failure. */
int sqfs_super_init(sqfs_super_t *super, size_t block_size, uint32_t mtime,
E_SQFS_COMPRESSOR compressor);
/* Returns 0 on success. Prints error messages to stderr on failure. */
int sqfs_super_write(sqfs_super_t *super, int fd);
/* Returns 0 on success. Prints error messages to stderr on failure. */
int sqfs_super_read(sqfs_super_t *super, int fd);
/* Check if a given xattr key can be encoded in squashfs at all. */
bool sqfs_has_xattr(const char *key);
#endif /* SQUASHFS_H */
|
