/* * 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 ] * 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 " is * given. In the latter case the length in bytes divided * by is given * * Version 2.03 2000/12/21 * - add "-d " option and use long long to fix things > 2 GB * Version 2.02 2000/10/11 * - error messages on IO failures [D. Gilbert] * */ #include #include #include #include #include #include #include "nls.h" #define ISODCL(from, to) (to - from + 1) int xflag; 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 le = isonum_721 (p); int be = isonum_722 (p+2); if (xflag && le != be) /* translation is useless */ fprintf(stderr, "723error: le=%d be=%d\n", 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 le = isonum_731 (p); int be = isonum_732 (p+4); if (xflag && le != be) /* translation is useless */ 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)]; }; const char *progname; int divisor = 0; static void isosize(char *filenamep) { int fd, nsecs, ssize; struct iso_primary_descriptor ipd; if ((fd = open(filenamep, O_RDONLY)) < 0) { perror(filenamep); fprintf(stderr, _("%s: failed to open: %s\n"), progname, filenamep); exit(1); } if (lseek(fd, 16 << 11, 0) == (off_t)-1) { perror("lseek"); fprintf(stderr, _("%s: seek error on %s\n"), progname, filenamep); exit(1); } if (read(fd, &ipd, sizeof(ipd)) < 0) { perror("read"); fprintf(stderr, _("%s: read error on %s\n"), progname, filenamep); exit(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 (divisor == 0) printf ("%lld\n", product * ssize); else if (divisor == ssize) printf ("%d\n", nsecs); else printf ("%lld\n", (product * ssize) / divisor); } close(fd); } int main(int argc, char * argv[]) { int j, ct; char *p; progname = argv[0]; if ((p = strrchr(progname, '/')) != NULL) progname = p+1; setlocale(LC_ALL, ""); bindtextdomain(PACKAGE, LOCALEDIR); textdomain(PACKAGE); if (argc >= 2 && (!strcmp(argv[1], "-V") || !strcmp(argv[1], "--version"))) { printf(_("%s (%s)\n"), progname, PACKAGE_STRING); exit(0); } for (;;) { int opt; opt = getopt(argc, argv, "xd:"); if (opt == -1) break; switch (opt) { case 'd': divisor = atoi(optarg); break; case 'x': xflag = 1; break; default: fprintf(stderr, _("%s: option parse error\n"), progname); exit(1); } } ct = argc - optind; if (ct <= 0) { fprintf(stderr, _("Usage: %s [-x] [-d ] iso9660-image\n"), progname); exit(1); } for (j = optind; j < argc; j++) { if (ct > 1) printf("%s: ", argv[j]); isosize(argv[j]); } return 0; }