56 lines
1.8 KiB
C
56 lines
1.8 KiB
C
/* @(#)bswap.h 1.3 06/09/13 Copyright 2002 J. Schilling */
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#ifndef _BSWAP_H
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#define _BSWAP_H
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/*
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* Allow to use B2N_* macros found in libdvdread in a portable way.
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* These macros should better be avoided as in place conversion in
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* general only works on processors like Motorola 68000 and Intel x86.
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* Modern processors usually have alignement restrictions that may
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* cause problems. The stripped down libdvdread for mkisofs is known
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* not to have these alignement problems, so we may use the macros
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* as they have been introduced by the authors of libdvdread.
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*
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* Copyright (c) 2002 J. Schilling
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*/
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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 version 2
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* as published by the Free Software Foundation.
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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 along with
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* this program; see the file COPYING. If not, write to the Free Software
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* Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <schily/mconfig.h>
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#include <schily/btorder.h>
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#include <schily/intcvt.h>
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#if defined(WORDS_BIGENDIAN)
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/* All bigendian systems are fine, just ignore the swaps. */
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#define B2N_16(x) (void)(x)
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#define B2N_32(x) (void)(x)
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#define B2N_64(x) (void)(x)
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#else
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/*
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* It is a bad idea to convert numbers in place.
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* In protocols, there is usually the additional problem that the
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* data is not properly aligned.
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*/
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#define B2N_16(x) (x) = a_to_u_2_byte(&(x))
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#define B2N_32(x) (x) = a_to_u_4_byte(&(x))
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#define B2N_64(x) (x) = a_to_u_8_byte(&(x))
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#endif
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#endif /* _BSWAP_H */
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