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/*
* linux/fs/isofs/util.c
*
* The special functions in the file are numbered according to the section
* of the iso 9660 standard in which they are described. isonum_733 will
* convert numbers according to section 7.3.3, etc.
*
* isofs special functions. This file was lifted in its entirety from
* the 386BSD iso9660 filesystem, by Pace Willisson <pace@blitz.com>.
*/
int
isonum_711 (char * p)
{
return (*p & 0xff);
}
int
isonum_712 (char * p)
{
int val;
val = *p;
if (val & 0x80)
val |= 0xffffff00;
return (val);
}
int
isonum_721 (char * p)
{
return ((p[0] & 0xff) | ((p[1] & 0xff) << 8));
}
int
isonum_722 (char * p)
{
return (((p[0] & 0xff) << 8) | (p[1] & 0xff));
}
int
isonum_723 (char * p)
{
#if 0
if (p[0] != p[3] || p[1] != p[2]) {
fprintf (stderr, "invalid format 7.2.3 number\n");
exit (1);
}
#endif
return (isonum_721 (p));
}
int
isonum_731 (char * p)
{
return ((p[0] & 0xff)
| ((p[1] & 0xff) << 8)
| ((p[2] & 0xff) << 16)
| ((p[3] & 0xff) << 24));
}
int
isonum_732 (char * p)
{
return (((p[0] & 0xff) << 24)
| ((p[1] & 0xff) << 16)
| ((p[2] & 0xff) << 8)
| (p[3] & 0xff));
}
int
isonum_733 (char * p)
{
#if 0
int i;
for (i = 0; i < 4; i++) {
if (p[i] != p[7-i]) {
fprintf (stderr, "bad format 7.3.3 number\n");
exit (1);
}
}
#endif
return (isonum_731 (p));
}
/*
* Local variables:
* c-file-style: "k&r"
* c-basic-offset: 8
* End:
*/
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