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81 lines
2.2 KiB
C
81 lines
2.2 KiB
C
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/*****
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*
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* This file is part of the OMS program.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* 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; see the file COPYING. If not, write to
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* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*****/
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#ifndef __BSWAP_H__
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#define __BSWAP_H__
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#ifdef HAVE_BYTESWAP_H
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#include <byteswap.h>
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#else
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#include <inttypes.h>
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#ifdef WORDS_BIGENDIAN
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// FIXME these need to actually swap ;)
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#define bswap_16(x) (x)
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#define bswap_32(x) (x)
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#define bswap_64(x) (x)
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#else
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// This is wrong, 'cannot take address of ...'
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#define bswap_16(x) ((((uint8_t*)&x)[2] << 8) \
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| (((uint8_t*)&x)[3]))
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// code from bits/byteswap.h (C) 1997, 1998 Free Software Foundation, Inc.
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#define bswap_32(x) \
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((((x) & 0xff000000) >> 24) | (((x) & 0x00ff0000) >> 8) | \
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(((x) & 0x0000ff00) << 8) | (((x) & 0x000000ff) << 24))
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#define bswap_64(x) \
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(__extension__ \
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({ union { __extension__ unsigned long long int __ll; \
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unsigned long int __l[2]; } __w, __r; \
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__w.__ll = (x); \
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__r.__l[0] = bswap_32 (__w.__l[1]); \
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__r.__l[1] = bswap_32 (__w.__l[0]); \
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__r.__ll; }))
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#endif
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#endif
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// be2me ... BigEndian to MachineEndian
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// le2me ... LittleEndian to MachineEndian
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#ifdef WORDS_BIGENDIAN
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#define be2me_16(x) (x)
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#define be2me_32(x) (x)
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#define be2me_64(x) (x)
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#define le2me_16(x) bswap_16(x)
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#define le2me_32(x) bswap_32(x)
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#define le2me_64(x) bswap_64(x)
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#else
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#define be2me_16(x) bswap_16(x)
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#define be2me_32(x) bswap_32(x)
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#define be2me_64(x) bswap_64(x)
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#define le2me_16(x) (x)
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#define le2me_32(x) (x)
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#define le2me_64(x) (x)
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#endif
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#endif
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