/*
* isosize.c - Andries Brouwer, 000608
*
* 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"
#define ISODCL(from, to) (to - from + 1)
static int isonum_721(unsigned char *p)
{
return ((p[0] & 0xff)
| ((p[1] & 0xff) << 8));
}
static int isonum_722(unsigned char *p)
{
return ((p[1] & 0xff)
| ((p[0] & 0xff) << 8));
}
static int isonum_723(unsigned char *p, int xflag)
{
int le = isonum_721(p);
int be = isonum_722(p + 2);
if (xflag && le != be)
/* translation is useless */
warnx("723error: le=%d be=%d", le, be);
return (le);
}
static int isonum_731(unsigned char *p)
{
return ((p[0] & 0xff)
| ((p[1] & 0xff) << 8)
| ((p[2] & 0xff) << 16)
| ((p[3] & 0xff) << 24));
}
static int isonum_732(unsigned char *p)
{
return ((p[3] & 0xff)
| ((p[2] & 0xff) << 8)
| ((p[1] & 0xff) << 16)
| ((p[0] & 0xff) << 24));
}
static int isonum_733(unsigned char *p, int xflag)
{
int le = isonum_731(p);
int be = isonum_732(p + 4);
if (xflag && le != be)
/* translation is useless */
warn("733error: le=%d be=%d", le, be);
return (le);
}
struct iso_primary_descriptor
{
unsigned char type [ISODCL ( 1, 1)]; /* 711 */
unsigned char id [ISODCL ( 2, 6)];
unsigned char version [ISODCL ( 7, 7)]; /* 711 */
unsigned char unused1 [ISODCL ( 8, 8)];
unsigned char system_id [ISODCL ( 9, 40)]; /* auchars */
unsigned char volume_id [ISODCL ( 41, 72)]; /* duchars */
unsigned char unused2 [ISODCL ( 73, 80)];
unsigned char volume_space_size [ISODCL ( 81, 88)]; /* 733 */
unsigned char unused3 [ISODCL ( 89, 120)];
unsigned char volume_set_size [ISODCL ( 121, 124)]; /* 723 */
unsigned char volume_sequence_number [ISODCL ( 125, 128)]; /* 723 */
unsigned char logical_block_size [ISODCL ( 129, 132)]; /* 723 */
unsigned char path_table_size [ISODCL ( 133, 140)]; /* 733 */
unsigned char type_l_path_table [ISODCL ( 141, 144)]; /* 731 */
unsigned char opt_type_l_path_table [ISODCL ( 145, 148)]; /* 731 */
unsigned char type_m_path_table [ISODCL ( 149, 152)]; /* 732 */
unsigned char opt_type_m_path_table [ISODCL ( 153, 156)]; /* 732 */
unsigned char root_directory_record [ISODCL ( 157, 190)]; /* 9.1 */
unsigned char volume_set_id [ISODCL ( 191, 318)]; /* duchars */
unsigned char publisher_id [ISODCL ( 319, 446)]; /* achars */
unsigned char preparer_id [ISODCL ( 447, 574)]; /* achars */
unsigned char application_id [ISODCL ( 575, 702)]; /* achars */
unsigned char copyright_file_id [ISODCL ( 703, 739)]; /* 7.5 dchars */
unsigned char abstract_file_id [ISODCL ( 740, 776)]; /* 7.5 dchars */
unsigned char bibliographic_file_id [ISODCL ( 777, 813)]; /* 7.5 dchars */
unsigned char creation_date [ISODCL ( 814, 830)]; /* 8.4.26.1 */
unsigned char modification_date [ISODCL ( 831, 847)]; /* 8.4.26.1 */
unsigned char expiration_date [ISODCL ( 848, 864)]; /* 8.4.26.1 */
unsigned char effective_date [ISODCL ( 865, 881)]; /* 8.4.26.1 */
unsigned char file_structure_version [ISODCL ( 882, 882)]; /* 711 */
unsigned char unused4 [ISODCL ( 883, 883)];
unsigned char application_data [ISODCL ( 884, 1395)];
unsigned char unused5 [ISODCL (1396, 2048)];
};
static void isosize(char *filenamep, int xflag, long divisor)
{
int fd, nsecs, ssize;
struct iso_primary_descriptor ipd;
if ((fd = open(filenamep, O_RDONLY)) < 0)
err(EXIT_FAILURE, _("failed to open %s"), filenamep);
if (lseek(fd, 16 << 11, 0) == (off_t) - 1)
err(EXIT_FAILURE, _("seek error on %s"), filenamep);
if (read(fd, &ipd, sizeof(ipd)) < 0)
err(EXIT_FAILURE, _("read error on %s"), filenamep);
nsecs = isonum_733(ipd.volume_space_size, xflag);
/* isonum_723 returns nowadays always 2048 */
ssize = isonum_723(ipd.logical_block_size, xflag);
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);
}
close(fd);
}
static void __attribute__((__noreturn__)) usage(FILE *out)
{
fprintf(out, _("\nUsage:\n"
" %s [options] iso9660_image_file\n"),
program_invocation_short_name);
fprintf(out, _("\nOptions:\n"
" -d, --divisor=NUM devide bytes NUM\n"
" -x, --sectors show sector count and size\n"
" -V, --version output version information and exit\n"
" -H, --help display this help and exit\n\n"));
exit(out == stderr ? EXIT_FAILURE : EXIT_SUCCESS);
}
int main(int argc, char **argv)
{
int j, ct, opt, xflag = 0;
long divisor = 0;
static const struct option longopts[] = {
{"divisor", no_argument, 0, 'd'},
{"sectors", no_argument, 0, 'x'},
{"version", no_argument, 0, 'V'},
{"help", no_argument, 0, 'h'},
{NULL, 0, 0, 0}
};
setlocale(LC_ALL, "");
bindtextdomain(PACKAGE, LOCALEDIR);
textdomain(PACKAGE);
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':
printf(_("%s (%s)\n"), program_invocation_short_name,
PACKAGE_STRING);
return EXIT_SUCCESS;
case 'h':
usage(stdout);
default:
usage(stderr);
}
ct = argc - optind;
if (ct <= 0)
usage(stderr);
for (j = optind; j < argc; j++) {
if (ct > 1)
printf("%s: ", argv[j]);
isosize(argv[j], xflag, divisor);
}
return EXIT_SUCCESS;
}
