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/*
* isosize : use iso9660 header info to find size of associated
* iso9660 file system
*
* Copyright (C) 2000 Andries Brouwer
* 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, or (at your option)
* any later version.
*
* isosize.c - Andries Brouwer, 000608
*
* 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 <fcntl.h>
#include <unistd.h>
#include <string.h>
#define ISODCL(from, to) (to - from + 1)
int xflag;
int
isonum_721 (unsigned char * p) {
return ((p[0] & 0xff)
| ((p[1] & 0xff) << 8));
}
int
isonum_722 (unsigned char * p) {
return ((p[1] & 0xff)
| ((p[0] & 0xff) << 8));
}
int
isonum_723 (unsigned char * p) {
int le = isonum_721 (p);
int be = isonum_722 (p+2);
if (xflag && le != be)
fprintf(stderr, "723error: le=%d be=%d\n", le, be);
return (le);
}
int
isonum_731 (unsigned char * p) {
return ((p[0] & 0xff)
| ((p[1] & 0xff) << 8)
| ((p[2] & 0xff) << 16)
| ((p[3] & 0xff) << 24));
}
int
isonum_732 (unsigned char * p) {
return ((p[3] & 0xff)
| ((p[2] & 0xff) << 8)
| ((p[1] & 0xff) << 16)
| ((p[0] & 0xff) << 24));
}
int
isonum_733 (unsigned char * p) {
int le = isonum_731 (p);
int be = isonum_732 (p+4);
if (xflag && le != be)
fprintf(stderr, "733error: le=%d be=%d\n", 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)];
};
int main(int argc, char * argv[]) {
struct iso_primary_descriptor ipd;
int fd, nsecs, ssize, j, m;
int divisor = 0;
const char * filenamep = NULL;
for (j = 1; j < argc; ++j) {
if (0 == strncmp("-d", argv[j], 2)) {
if (strlen(argv[j]) > 2)
m = 2;
else {
++j;
if (j >= argc) {
filenamep = NULL;
break;
}
m = 0;
}
if (1 != sscanf(argv[j] + m, "%d", &divisor)) {
fprintf(stderr, "Couldn't decode number after '-d' switch\n");
filenamep = NULL;
break;
}
}
else if (0 == strcmp("-x", argv[j]))
xflag = 1;
else if (*argv[j] == '-') {
fprintf(stderr, "Unrecognized switch: %s\n", argv[j]);
filenamep = NULL;
break;
}
else
filenamep = argv[j];
}
if(filenamep == NULL) {
fprintf(stderr, "Usage: isosize [-x] [-d <num>] iso9660-image\n");
return 1;
}
if ((fd = open(filenamep,O_RDONLY)) < 0) {
fprintf(stderr, "failed to open: %s", filenamep);
perror(", error");
return 1;
}
if (lseek(fd, 16 << 11, 0) == (off_t)-1) {
perror("lseek error");
return 1;
}
if (read(fd, &ipd, sizeof(ipd)) < 0) {
perror("read error");
return 1;
}
nsecs = isonum_733(ipd.volume_space_size);
ssize = isonum_723(ipd.logical_block_size); /* nowadays always 2048 */
if (xflag)
printf ("sector count: %d, sector size: %d\n", nsecs, ssize);
else {
long long product = nsecs;
if (0 == divisor)
printf ("%lld\n", product * ssize);
else if (divisor == ssize)
printf ("%d\n", nsecs);
else
printf ("%lld\n", (product * ssize) / divisor);
}
return 0;
}
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