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/* pint.h
* Definitions for extracting and translating integers safely and portably
* via pointers.
*
* $Id: pint.h,v 1.1 2000/09/27 04:54:50 gram Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@zing.org>
* Copyright 1998 Gerald Combs
*
*
* 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
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifndef __PINT_H__
#define __PINT_H__
#include <glib.h>
/* Pointer versions of ntohs and ntohl. Given a pointer to a member of a
* byte array, returns the value of the two or four bytes at the pointer.
* The pletoh[sl] versions return the little-endian representation.
*
* If G_HAVE_GINT64 is defined, so we can use "gint64" and "guint64" to
* refer to 64-bit integral quantities, we also provide pntohll and
* phtolell, which extract 64-bit integral quantities.
*/
#define pntohs(p) ((guint16) \
((guint16)*((guint8 *)(p)+0)<<8| \
(guint16)*((guint8 *)(p)+1)<<0))
#define pntoh24(p) ((guint32)*((guint8 *)(p)+0)<<16| \
(guint32)*((guint8 *)(p)+1)<<8| \
(guint32)*((guint8 *)(p)+2)<<0)
#define pntohl(p) ((guint32)*((guint8 *)(p)+0)<<24| \
(guint32)*((guint8 *)(p)+1)<<16| \
(guint32)*((guint8 *)(p)+2)<<8| \
(guint32)*((guint8 *)(p)+3)<<0)
#ifdef G_HAVE_GINT64
#define pntohll(p) ((guint64)*((guint8 *)(p)+0)<<56| \
(guint64)*((guint8 *)(p)+1)<<48| \
(guint64)*((guint8 *)(p)+2)<<40| \
(guint64)*((guint8 *)(p)+3)<<32| \
(guint64)*((guint8 *)(p)+4)<<24| \
(guint64)*((guint8 *)(p)+5)<<16| \
(guint64)*((guint8 *)(p)+6)<<8| \
(guint64)*((guint8 *)(p)+7)<<0)
#endif
#define pletohs(p) ((guint16) \
((guint16)*((guint8 *)(p)+1)<<8| \
(guint16)*((guint8 *)(p)+0)<<0))
#define pletoh24(p) ((guint32)*((guint8 *)(p)+2)<<16| \
(guint32)*((guint8 *)(p)+1)<<8| \
(guint32)*((guint8 *)(p)+0)<<0)
#define pletohl(p) ((guint32)*((guint8 *)(p)+3)<<24| \
(guint32)*((guint8 *)(p)+2)<<16| \
(guint32)*((guint8 *)(p)+1)<<8| \
(guint32)*((guint8 *)(p)+0)<<0)
#ifdef G_HAVE_GINT64
#define pletohll(p) ((guint64)*((guint8 *)(p)+7)<<56| \
(guint64)*((guint8 *)(p)+6)<<48| \
(guint64)*((guint8 *)(p)+5)<<40| \
(guint64)*((guint8 *)(p)+4)<<32| \
(guint64)*((guint8 *)(p)+3)<<24| \
(guint64)*((guint8 *)(p)+2)<<16| \
(guint64)*((guint8 *)(p)+1)<<8| \
(guint64)*((guint8 *)(p)+0)<<0)
#endif
/* Macros to byte-swap 32-bit and 16-bit quantities. */
#define BSWAP32(x) \
((((x)&0xFF000000)>>24) | \
(((x)&0x00FF0000)>>8) | \
(((x)&0x0000FF00)<<8) | \
(((x)&0x000000FF)<<24))
#define BSWAP16(x) \
((((x)&0xFF00)>>8) | \
(((x)&0x00FF)<<8))
/* Turn host-byte-order values into little-endian values. */
#ifdef WORDS_BIGENDIAN
#define htoles(s) ((guint16) \
((guint16)((s) & 0x00FF)<<8| \
(guint16)((s) & 0xFF00)>>8))
#define htolel(l) ((guint32)((l) & 0x000000FF)<<24| \
(guint32)((l) & 0x0000FF00)<<8| \
(guint32)((l) & 0x00FF0000)>>8| \
(guint32)((l) & 0xFF000000)>>24)
#else
#define htoles(s) (s)
#define htolel(l) (l)
#endif
#endif /* PINT_H */
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