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
|
/*
* Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*
*/
#include <errno.h>
#include <fcntl.h>
#include <libgen.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
static char *progname;
static unsigned char eof_mark[4] = {0xde, 0xad, 0xc0, 0xde};
#define ERR(fmt, ...) do { \
fflush(0); \
fprintf(stderr, "[%s] *** error: " fmt "\n", \
progname, ## __VA_ARGS__ ); \
} while (0)
#define ERRS(fmt, ...) do { \
int save = errno; \
fflush(0); \
fprintf(stderr, "[%s] *** error: " fmt ", %s\n", \
progname, ## __VA_ARGS__, strerror(save)); \
} while (0)
#define BUF_SIZE (64 * 1024)
#define ALIGN(_x,_y) (((_x) + ((_y) - 1)) & ~((_y) - 1))
static int pad_image(char *name, uint32_t pad_mask)
{
char *buf;
int fd;
ssize_t in_len;
ssize_t out_len;
int ret = -1;
buf = malloc(BUF_SIZE);
if (!buf) {
ERR("No memory for buffer");
goto out;
}
fd = open(name, O_RDWR);
if (fd < 0) {
ERRS("Unable to open %s", name);
goto free_buf;
}
in_len = lseek(fd, 0, SEEK_END);
if (in_len < 0)
goto close;
memset(buf, '\xff', BUF_SIZE);
out_len = in_len;
while (pad_mask) {
uint32_t mask;
ssize_t t;
int i;
for (i = 10; i < 32; i++) {
mask = 1UL << i;
if (pad_mask & mask)
break;
}
in_len = ALIGN(in_len, mask);
for (i = 10; i < 32; i++) {
mask = 1UL << i;
if ((in_len & (mask - 1)) == 0)
pad_mask &= ~mask;
}
printf("padding image to %08x\n", (unsigned int) in_len);
while (out_len < in_len) {
ssize_t len;
len = in_len - out_len;
if (len > BUF_SIZE)
len = BUF_SIZE;
t = write(fd, buf, len);
if (t != len) {
ERRS("Unable to write to %s", name);
goto close;
}
out_len += len;
}
/* write out the JFFS end-of-filesystem marker */
t = write(fd, eof_mark, 4);
if (t != 4) {
ERRS("Unable to write to %s", name);
goto close;
}
out_len += 4;
}
ret = 0;
close:
close(fd);
free_buf:
free(buf);
out:
return ret;
}
int main(int argc, char* argv[])
{
uint32_t pad_mask;
int ret = EXIT_FAILURE;
int err;
int i;
progname = basename(argv[0]);
if (argc < 2) {
fprintf(stderr,
"Usage: %s file [pad0] [pad1] [padN]\n",
progname);
goto out;
}
pad_mask = 0;
for (i = 2; i < argc; i++)
pad_mask |= strtoul(argv[i], NULL, 0) * 1024;
if (pad_mask == 0)
pad_mask = (4 * 1024) | (8 * 1024) | (64 * 1024) |
(128 * 1024);
err = pad_image(argv[1], pad_mask);
if (err)
goto out;
ret = EXIT_SUCCESS;
out:
return ret;
}
|
