From mboxrd@z Thu Jan  1 00:00:00 1970
From: alexandr babic <alexandr@babi.cz>
To: 9fans@cse.psu.edu
Content-Type: text/plain
Date: Mon, 22 Aug 2005 19:11:59 +0200
Message-Id: <1124730719.3070.34.camel@localhost.localdomain>
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Subject: [9fans] Q: checking CD vs. iso image
Topicbox-Message-UUID: 7af4a148-ead0-11e9-9d60-3106f5b1d025

hi.

and what about to compare one byte from cd with one byte from iso
by following short program, but i haven't plan9 here so you have 
to try by yourself :-)

alexandr.


check.c
------------------------------
#include <u.h>
#include <libc.h> 

void main()
{
int cdfd,isofd,i,r;
unsigned char C,I;

cdfd=open("/dev/sdD0/data",OREAD); 
isofd=open("obraz.iso",OREAD); 

i=0;

while(1)
{
 r=read(cdfd,(void*)&C,1);
 if(r==0) break;
 r=read(isofd,(void*)&I,1);
 if(r==0) break;
 i++;

 if(C==I) print("byte position=%d, bytes are same!\n",i);
 else print("byte position=%d, bytes differ! cd is %d, iso is %d
\n",i,C,I);
}

close(cdfd);
close(isofd);
exits(0);
}