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92 lines
4.3 KiB
C
92 lines
4.3 KiB
C
#ifndef XADMASTER_CONVERTE_C
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#define XADMASTER_CONVERTE_C
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/* $Id: ConvertE.c,v 1.5 2005/06/23 14:54:41 stoecker Exp $
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endian conversion macros
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XAD library system for archive handling
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Copyright (C) 1998 and later by Dirk Stöcker <soft@dstoecker.de>
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/* EndGetXXX(a) - returns value read direct from memory in fixed size and
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* endianness, returned to native order.
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*
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* Keep in mind, that the macros require calculation time, so avoid to use
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* them double time. Call them once and reuse results.
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*
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* XXX can be:
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* M64 - big-endian Motorola format, 64 bit value
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* M32 - big-endian Motorola format, 32 bit value
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* M24 - big-endian Motorola format, 24 bit value
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* M16 - big-endian Motorola format, 16 bit value
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*
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* I64 - little-endian Intel format, 64 bit value
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* I32 - little-endian Intel format, 32 bit value
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* I24 - little-endian Intel format, 24 bit value
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* I16 - little-endian Intel format, 16 bit value
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*/
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#define EndGetM32(a) (((((unsigned char *) a)[0]) << 24) | \
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((((unsigned char *) a)[1]) << 16) | \
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((((unsigned char *) a)[2]) << 8) | \
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((((unsigned char *) a)[3])))
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#define EndGetM24(a) (((((unsigned char *) a)[0]) << 16) | \
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((((unsigned char *) a)[1]) << 8) | \
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((((unsigned char *) a)[2])))
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#define EndGetM16(a) (((((unsigned char *) a)[0]) << 8) | \
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((((unsigned char *) a)[1])))
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#define EndGetI32(a) (((((unsigned char *) a)[3]) << 24) | \
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((((unsigned char *) a)[2]) << 16) | \
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((((unsigned char *) a)[1]) << 8) | \
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((((unsigned char *) a)[0])))
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#define EndGetI24(a) (((((unsigned char *) a)[2]) << 16) | \
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((((unsigned char *) a)[1]) << 8) | \
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((((unsigned char *) a)[0])))
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#define EndGetI16(a) (((((unsigned char *) a)[1]) << 8) | \
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((((unsigned char *) a)[0])))
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/* 64-bit support */
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#define _convM32(a,n)(((((unsigned char *) a)[n+0]) << 24) | \
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((((unsigned char *) a)[n+1]) << 16) | \
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((((unsigned char *) a)[n+2]) << 8) | \
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((((unsigned char *) a)[n+3])))
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#define _convI32(a,n)(((((unsigned char *) a)[n+3]) << 24) | \
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((((unsigned char *) a)[n+2]) << 16) | \
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((((unsigned char *) a)[n+1]) << 8) | \
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((((unsigned char *) a)[n+0])))
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#if defined(AMIGA) /* AMIGA XAD has not 64 bit types yet */
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# define EndGetI64(a) ((unsigned int) _convi32(a,0))
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# define EndGetM64(a) ((unsigned int) _convm32(a,4))
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#elif defined(HAVE_STDINT_H)
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# include <stdint.h>
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/* C99 -- use "uint64_t" as 64-bit type */
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# define EndGetI64(a) ((((uint64_t) _convi32(a,4)) << 32) | \
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((unsigned int) _convi32(a,0)))
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# define EndGetM64(a) ((((uint64_t) _convm32(a,0)) << 32) | \
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((unsigned int) _convm32(a,4)))
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#else
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/* GCC -- use "unsigned long long int" as 64-bit type */
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# define EndGetI64(a) ((((unsigned long long int) _convi32(a,4)) << 32) | \
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((unsigned int) _convi32(a,0)))
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# define EndGetM64(a) ((((unsigned long long int) _convm32(a,0)) << 32) | \
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((unsigned int) _convm32(a,4)))
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#endif
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#endif /* XADMASTER_CONVERTE_C */
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