127 lines
4.4 KiB
C
127 lines
4.4 KiB
C
/* pint.h
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* Definitions for extracting and translating integers safely and portably
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* via pointers.
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*
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* $Id: pint.h,v 1.2 2000/09/28 03:16:16 gram Exp $
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@zing.org>
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* Copyright 1998 Gerald Combs
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*
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifndef __PINT_H__
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#define __PINT_H__
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#include <glib.h>
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/* Pointer versions of ntohs and ntohl. Given a pointer to a member of a
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* byte array, returns the value of the two or four bytes at the pointer.
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* The pletoh[sl] versions return the little-endian representation.
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*
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* If G_HAVE_GINT64 is defined, so we can use "gint64" and "guint64" to
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* refer to 64-bit integral quantities, we also provide pntohll and
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* phtolell, which extract 64-bit integral quantities.
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*/
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#define pntohs(p) ((guint16) \
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((guint16)*((guint8 *)(p)+0)<<8| \
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(guint16)*((guint8 *)(p)+1)<<0))
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#define pntoh24(p) ((guint32)*((guint8 *)(p)+0)<<16| \
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(guint32)*((guint8 *)(p)+1)<<8| \
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(guint32)*((guint8 *)(p)+2)<<0)
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#define pntohl(p) ((guint32)*((guint8 *)(p)+0)<<24| \
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(guint32)*((guint8 *)(p)+1)<<16| \
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(guint32)*((guint8 *)(p)+2)<<8| \
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(guint32)*((guint8 *)(p)+3)<<0)
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#ifdef G_HAVE_GINT64
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#define pntohll(p) ((guint64)*((guint8 *)(p)+0)<<56| \
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(guint64)*((guint8 *)(p)+1)<<48| \
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(guint64)*((guint8 *)(p)+2)<<40| \
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(guint64)*((guint8 *)(p)+3)<<32| \
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(guint64)*((guint8 *)(p)+4)<<24| \
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(guint64)*((guint8 *)(p)+5)<<16| \
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(guint64)*((guint8 *)(p)+6)<<8| \
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(guint64)*((guint8 *)(p)+7)<<0)
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#endif
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#define pletohs(p) ((guint16) \
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((guint16)*((guint8 *)(p)+1)<<8| \
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(guint16)*((guint8 *)(p)+0)<<0))
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#define pletoh24(p) ((guint32)*((guint8 *)(p)+2)<<16| \
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(guint32)*((guint8 *)(p)+1)<<8| \
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(guint32)*((guint8 *)(p)+0)<<0)
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#define pletohl(p) ((guint32)*((guint8 *)(p)+3)<<24| \
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(guint32)*((guint8 *)(p)+2)<<16| \
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(guint32)*((guint8 *)(p)+1)<<8| \
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(guint32)*((guint8 *)(p)+0)<<0)
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#ifdef G_HAVE_GINT64
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#define pletohll(p) ((guint64)*((guint8 *)(p)+7)<<56| \
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(guint64)*((guint8 *)(p)+6)<<48| \
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(guint64)*((guint8 *)(p)+5)<<40| \
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(guint64)*((guint8 *)(p)+4)<<32| \
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(guint64)*((guint8 *)(p)+3)<<24| \
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(guint64)*((guint8 *)(p)+2)<<16| \
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(guint64)*((guint8 *)(p)+1)<<8| \
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(guint64)*((guint8 *)(p)+0)<<0)
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#endif
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/* Macros to byte-swap 32-bit and 16-bit quantities. */
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#define BSWAP32(x) \
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((((x)&0xFF000000)>>24) | \
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(((x)&0x00FF0000)>>8) | \
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(((x)&0x0000FF00)<<8) | \
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(((x)&0x000000FF)<<24))
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#define BSWAP16(x) \
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((((x)&0xFF00)>>8) | \
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(((x)&0x00FF)<<8))
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/* Turn host-byte-order values into little-endian values. */
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#ifdef WORDS_BIGENDIAN
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#define htoles(s) ((guint16) \
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((guint16)((s) & 0x00FF)<<8| \
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(guint16)((s) & 0xFF00)>>8))
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#define htolel(l) ((guint32)((l) & 0x000000FF)<<24| \
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(guint32)((l) & 0x0000FF00)<<8| \
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(guint32)((l) & 0x00FF0000)>>8| \
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(guint32)((l) & 0xFF000000)>>24)
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#else
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#define htoles(s) (s)
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#define htolel(l) (l)
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#endif
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/* Byte ordering */
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#ifndef BYTE_ORDER
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# define LITTLE_ENDIAN 4321
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# define BIG_ENDIAN 1234
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# ifdef WORDS_BIGENDIAN
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# define BYTE_ORDER BIG_ENDIAN
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# else
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# define BYTE_ORDER LITTLE_ENDIAN
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# endif
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#endif
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#endif /* PINT_H */
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