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
|
/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* super.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#define SQFS_BUILDING_DLL
#include "config.h"
#include "sqfs/super.h"
#include "util.h"
#include <endian.h>
#include <string.h>
#include <unistd.h>
#include <stdio.h>
int sqfs_super_init(sqfs_super_t *super, size_t block_size, uint32_t mtime,
E_SQFS_COMPRESSOR compressor)
{
unsigned int i;
if (block_size & (block_size - 1)) {
fputs("Block size must be a power of 2!\n", stderr);
return -1;
}
if (block_size < 4096 || block_size >= (1 << 20)) {
fputs("Block size must be between 4k and 1M\n", stderr);
return -1;
}
memset(super, 0, sizeof(*super));
super->magic = SQFS_MAGIC;
super->modification_time = mtime;
super->block_size = block_size;
super->compression_id = compressor;
super->flags = SQFS_FLAG_NO_FRAGMENTS | SQFS_FLAG_NO_XATTRS;
super->version_major = SQFS_VERSION_MAJOR;
super->version_minor = SQFS_VERSION_MINOR;
super->bytes_used = sizeof(*super);
super->id_table_start = 0xFFFFFFFFFFFFFFFFUL;
super->xattr_id_table_start = 0xFFFFFFFFFFFFFFFFUL;
super->inode_table_start = 0xFFFFFFFFFFFFFFFFUL;
super->directory_table_start = 0xFFFFFFFFFFFFFFFFUL;
super->fragment_table_start = 0xFFFFFFFFFFFFFFFFUL;
super->export_table_start = 0xFFFFFFFFFFFFFFFFUL;
for (i = block_size; i != 0x01; i >>= 1)
super->block_log += 1;
return 0;
}
int sqfs_super_write(sqfs_super_t *super, int fd)
{
sqfs_super_t copy;
copy.magic = htole32(super->magic);
copy.inode_count = htole32(super->inode_count);
copy.modification_time = htole32(super->modification_time);
copy.block_size = htole32(super->block_size);
copy.fragment_entry_count = htole32(super->fragment_entry_count);
copy.compression_id = htole16(super->compression_id);
copy.block_log = htole16(super->block_log);
copy.flags = htole16(super->flags);
copy.id_count = htole16(super->id_count);
copy.version_major = htole16(super->version_major);
copy.version_minor = htole16(super->version_minor);
copy.root_inode_ref = htole64(super->root_inode_ref);
copy.bytes_used = htole64(super->bytes_used);
copy.id_table_start = htole64(super->id_table_start);
copy.xattr_id_table_start = htole64(super->xattr_id_table_start);
copy.inode_table_start = htole64(super->inode_table_start);
copy.directory_table_start = htole64(super->directory_table_start);
copy.fragment_table_start = htole64(super->fragment_table_start);
copy.export_table_start = htole64(super->export_table_start);
if (lseek(fd, 0, SEEK_SET) == (off_t)-1)
goto fail_seek;
if (write_data("writing super block", fd, ©, sizeof(copy)))
return -1;
if (lseek(fd, 0, SEEK_END) == (off_t)-1)
goto fail_seek;
return 0;
fail_seek:
perror("squashfs writing super block: seek on output file");
return -1;
}
|
