iso9660.c

/* $Id$ */
/* ----------------------------------------------------------------------- *
 *   
 *   Copyright 2001 H. Peter Anvin - All Rights Reserved
 *
 *   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, Inc., 675 Mass Ave, Cambridge MA 02139,
 *   USA; either version 2 of the License, or (at your option) any later
 *   version; incorporated herein by reference.
 *
 * ----------------------------------------------------------------------- */

#include "iso9660.h"

/* zisofs magic */

const unsigned char zisofs_magic[8] = {
  0x37, 0xE4, 0x53, 0x96, 0xC9, 0xDB, 0xD6, 0x07
};

/* iso9660 integer formats */

void
set_721(void *pnt, unsigned int i)
{
  unsigned char *p = (unsigned char *)pnt;
  p[0] = i & 0xff;
  p[1] = (i >> 8) & 0xff;
}

unsigned int
get_721(void *pnt)
{
  unsigned char *p = (unsigned char *)pnt;
  return ((unsigned int)p[0]) + ((unsigned int)p[1] << 8);
}

void
set_722(void *pnt, unsigned int i)
{
  unsigned char *p = (unsigned char *)pnt;
  p[0] = (i >> 8) & 0xff;
  p[1] = i & 0xff;
}

unsigned int
get_722(void *pnt)
{
  unsigned char *p = (unsigned char *)pnt;
  return ((unsigned int)p[0] << 8) + ((unsigned int)p[1]);
}

void
set_723(void *pnt, unsigned int i)
{
  unsigned char *p = (unsigned char *)pnt;
  p[3] = p[0] = i & 0xff;
  p[2] = p[1] = (i >> 8) & 0xff;
}

#define get_723(x) get_721(x)

void
set_731(void *pnt, unsigned int i)
{
  unsigned char *p = (unsigned char *)pnt;
  p[0] = i & 0xff;
  p[1] = (i >> 8) & 0xff;
  p[2] = (i >> 16) & 0xff;
  p[3] = (i >> 24) & 0xff;
}

unsigned int
get_731(void *pnt)
{
  unsigned char *p = (unsigned char *)pnt;
  return ((unsigned int)p[0]) + ((unsigned int)p[1] << 8) +
    ((unsigned int)p[2] << 16) + ((unsigned int)p[3] << 24);
}

void
set_732(void *pnt, unsigned int i)
{
  unsigned char *p = (unsigned char *)pnt;
  p[3] = i & 0xff;
  p[2] = (i >> 8) & 0xff;
  p[1] = (i >> 16) & 0xff;
  p[0] = (i >> 24) & 0xff;
}

unsigned int
get_732(void *pnt)
{
  unsigned char *p = (unsigned char *)pnt;
  return ((unsigned int)p[0] << 24) + ((unsigned int)p[1] << 16) +
    ((unsigned int)p[2] << 8) + ((unsigned int)p[3]);
}

void
set_733(void *pnt, unsigned int i)
{
  unsigned char *p = (unsigned char *)pnt;
  p[7] = p[0] = i & 0xff;
  p[6] = p[1] = (i >> 8) & 0xff;
  p[5] = p[2] = (i >> 16) & 0xff;
  p[4] = p[3] = (i >> 24) & 0xff;
}

#define get_733(x) get_731(x)