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/*
crc.c : Multiple Devices tools for Linux
Copyright (C) 1994-96 Marc ZYNGIER
<zyngier@ufr-info-p7.ibp.fr> or
<maz@gloups.fdn.fr>
A lot of this file comes from the modules pakage.
Please flame ME if something is wrong here, NOT the original authors.
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.
You should have received a copy of the GNU General Public License
(for example /usr/src/linux/COPYING); if not, write to the Free
Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "common.h"
int open_or_die (char *file)
{
int fd;
if ((fd=open (file, O_RDONLY))==-1)
{
perror (file);
exit (EXIT_FAILURE);
}
return fd;
}
/* stollen from modules tools... */
static unsigned long crctab32[] =
{
#include "crc32.tab"
};
static unsigned long updcrc32(register unsigned char *s)
{
static unsigned long crcreg;
register unsigned long c, *t;
if (s == 0)
c = 0xffffffffU;
else
{
c = crcreg;
t = crctab32;
while (*s)
c = t[((int)c ^ (*s++)) & 0xff] ^ (c >> 8);
}
crcreg = c;
return c ^ 0xffffffffU;
}
unsigned long calc_checksum (char *entry[], int pers)
{
int i, fd, sz=0;
unsigned long cap;
char text[MD_BLK_SIZ];
updcrc32 (NULL);
for (i=1; entry[i]; i++)
{
fd=open_or_die (entry[i]);
if (ioctl (fd, BLKGETSIZE, &cap))
{
perror (entry[i]);
exit (EXIT_FAILURE);
}
sz += sprintf (text + sz, "%08lx%s%d", cap, entry[i], i);
}
sz += sprintf (text + sz, "%08x", pers);
return updcrc32 (text);
}
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