/* * 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 . */ 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: */