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
|
/*
* SPDX-License-Identifier: GPL-2.0-or-later
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Copyright (C) 2000 Andries Brouwer
* Copyright (C) 2023 Karel Zak <kzak@redhat.com>
*
* use header info to find size of iso9660 file system
* output a number - useful in scripts
*
* Synopsis:
* isosize [-x] [-d <num>] <filename>
* where "-x" gives length in sectors and sector size while
* without this argument the size is given in bytes
* without "-x" gives length in bytes unless "-d <num>" is
* given. In the latter case the length in bytes divided
* by <num> is given
*
* Version 2.03 2000/12/21
* - add "-d <num>" option and use long long to fix things > 2 GB
* Version 2.02 2000/10/11
* - error messages on IO failures [D. Gilbert]
*/
#include <stdio.h>
#include <stdlib.h>
#include <getopt.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include "nls.h"
#include "c.h"
#include "strutils.h"
#include "closestream.h"
#include "iso9660.h"
#define ISOSIZE_EXIT_ALLFAILED 32
#define ISOSIZE_EXIT_SOMEOK 64
static int is_iso(int fd)
{
char label[8];
if (pread(fd, &label, 8, 0x8000) == -1)
return 1;
return memcmp(&label, &"\1CD001\1", 8);
}
static int isosize(int argc, char *filenamep, int xflag, long divisor)
{
int fd, nsecs, ssize, rc = -1;
unsigned char volume_space_size[8];
unsigned char logical_block_size[4];
if ((fd = open(filenamep, O_RDONLY)) < 0) {
warn(_("cannot open %s"), filenamep);
goto done;
}
if (is_iso(fd))
warnx(_("%s: might not be an ISO filesystem"), filenamep);
if (pread(fd, volume_space_size, sizeof(volume_space_size), 0x8050) != sizeof(volume_space_size) ||
pread(fd, logical_block_size, sizeof(logical_block_size), 0x8080) != sizeof(logical_block_size)) {
if (errno)
warn(_("read error on %s"), filenamep);
else
warnx(_("read error on %s"), filenamep);
goto done;
}
nsecs = isonum_733(volume_space_size, xflag);
/* isonum_723 returns nowadays always 2048 */
ssize = isonum_723(logical_block_size, xflag);
if (1 < argc)
printf("%s: ", filenamep);
if (xflag)
printf(_("sector count: %d, sector size: %d\n"), nsecs, ssize);
else {
long long product = nsecs;
if (divisor == 0)
printf("%lld\n", product * ssize);
else if (divisor == ssize)
printf("%d\n", nsecs);
else
printf("%lld\n", (product * ssize) / divisor);
}
rc = 0;
done:
if (fd >= 0)
close(fd);
return rc;
}
static void __attribute__((__noreturn__)) usage(void)
{
fputs(USAGE_HEADER, stdout);
fprintf(stdout,
_(" %s [options] <iso9660_image_file> ...\n"),
program_invocation_short_name);
fputs(USAGE_SEPARATOR, stdout);
fputs(_("Show the length of an ISO-9660 filesystem.\n"), stdout);
fputs(USAGE_OPTIONS, stdout);
fputs(_(" -d, --divisor=<number> divide the amount of bytes by <number>\n"), stdout);
fputs(_(" -x, --sectors show sector count and size\n"), stdout);
fprintf(stdout, USAGE_HELP_OPTIONS(25));
fprintf(stdout, USAGE_MAN_TAIL("isosize(8)"));
exit(EXIT_SUCCESS);
}
int main(int argc, char **argv)
{
int j, ct_err = 0, ct, opt, xflag = 0;
long divisor = 0;
static const struct option longopts[] = {
{"divisor", required_argument, NULL, 'd'},
{"sectors", no_argument, NULL, 'x'},
{"version", no_argument, NULL, 'V'},
{"help", no_argument, NULL, 'h'},
{NULL, 0, NULL, 0}
};
setlocale(LC_ALL, "");
bindtextdomain(PACKAGE, LOCALEDIR);
textdomain(PACKAGE);
close_stdout_atexit();
while ((opt = getopt_long(argc, argv, "d:xVh", longopts, NULL)) != -1) {
switch (opt) {
case 'd':
divisor =
strtol_or_err(optarg,
_("invalid divisor argument"));
break;
case 'x':
xflag = 1;
break;
case 'V':
print_version(EXIT_SUCCESS);
case 'h':
usage();
default:
errtryhelp(EXIT_FAILURE);
}
}
ct = argc - optind;
if (ct <= 0) {
warnx(_("no device specified"));
errtryhelp(EXIT_FAILURE);
}
for (j = optind; j < argc; j++) {
if (isosize(ct, argv[j], xflag, divisor) != 0)
ct_err++;
}
return ct == ct_err ? ISOSIZE_EXIT_ALLFAILED : /* all failed */
ct_err ? ISOSIZE_EXIT_SOMEOK : /* some ok */
EXIT_SUCCESS; /* all success */
}
|
