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/*
isodetect.c
gcc -O2 -Wall isodetect.c -o isodetect
Looks in first block of an block-device and checks if there is an ISO9660-
filesystem on it. This is done by checking for a string "CD001".
Also reads certain information out of the block.
14.11.95 T.Niederreiter (based on cdlabel.c by aeb)
*/
#include <stdio.h>
#include <ctype.h>
#include <unistd.h>
#include <fcntl.h>
#include <termio.h>
char buf[1024];
char devname[80];
void printnsp(int begin, int end, char *txt);
void printchar(unsigned char c);
main(int argc, char **argv) {
FILE * infile;
int c;
int id=0;
/* Default device to check */
strcpy(devname,"/dev/cdrom");
while ((c = getopt (argc,argv,"hVpPAd:")) != EOF) {
switch(c) {
case 0:
break;
case 'V':
id=1;
break;
case 'p':
id=2;
break;
case 'P':
id=3;
break;
case 'A':
id=4;
break;
case 'd':
strcpy(devname,optarg);
break;
case 'h':
printf("Usage: %s [OPTIONS]\n",argv[0]);
printf("\
-h show help (this text)\n\
-V print VOLUME_ID of ISO9660-Image\n\
-p print PREPARER_ID of ISO9660-Image\n\
-P print PUBLISHER_ID of ISO9660-Image\n\
-A print APPLICATION_ID of ISO9660-Image\n\
-d <device>\n");
exit(1);
}
}
infile = fopen(devname, "rb");
if (infile == NULL) {
perror(devname);
exit(1);
}
if (lseek(fileno(infile), 32768, SEEK_SET) < 0) {
perror("lseek");
exit(1);
}
if (read(fileno(infile), buf, sizeof(buf)) != sizeof(buf)) {
perror("read");
exit(1);
}
if (strncmp(buf, "\001CD001\001", 8) != 0) {
if (id==0) {
printf("Not ISO9660\n");
exit(0);
}
}
else {
switch(id) {
case 0:
printf("ISO9660\n");
exit(0);
break;
case 1:
printnsp(40,72,"Volume_ID"); /* 32 */
break;
case 3:
printnsp(318,446,"Publisher"); /* 128 */
break;
case 2:
printnsp(446,574,"Preparer"); /* 128 */
break;
case 4:
printnsp(574,702,"Application"); /* 128 */
break;
}
}
exit(0);
}
int empty(char c) {
return (c == 0 || c == ' ');
}
void printnsp(int begin, int end, char *txt) {
int i,j,k;
for(i=begin; i<end; i++) {
if (empty(buf[i]))
continue;
for(j=i+1; j<end; j++)
if (!buf[j] || (j < end-1
&& empty(buf[j]) && empty(buf[j+1]))) break;
for(k=i; k<j; k++)
printchar(buf[k]);
printf("\n");
i = j;
}
}
void printchar(unsigned char c) {
if (isprint(c) || isspace(c))
putchar(c);
else
printf("\\%03o", c);
}
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