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106 lines
3.9 KiB
C
106 lines
3.9 KiB
C
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/*-
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* See the file LICENSE for redistribution information.
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*
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* Copyright (c) 1996, 1997
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* Sleepycat Software. All rights reserved.
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*/
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/*
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* Copyright (c) 1990, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)db_swap.h 10.3 (Sleepycat) 6/10/97
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*/
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#ifndef _DB_SWAP_H_
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#define _DB_SWAP_H_
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/*
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* Little endian <==> big endian 32-bit swap macros.
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* M_32_SWAP swap a memory location
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* P_32_COPY copy potentially unaligned 4 byte quantities
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* P_32_SWAP swap a referenced memory location
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*/
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#define M_32_SWAP(a) { \
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u_int32_t _tmp; \
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_tmp = a; \
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((u_int8_t *)&a)[0] = ((u_int8_t *)&_tmp)[3]; \
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((u_int8_t *)&a)[1] = ((u_int8_t *)&_tmp)[2]; \
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((u_int8_t *)&a)[2] = ((u_int8_t *)&_tmp)[1]; \
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((u_int8_t *)&a)[3] = ((u_int8_t *)&_tmp)[0]; \
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}
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#define P_32_COPY(a, b) { \
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((u_int8_t *)b)[0] = ((u_int8_t *)a)[0]; \
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((u_int8_t *)b)[1] = ((u_int8_t *)a)[1]; \
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((u_int8_t *)b)[2] = ((u_int8_t *)a)[2]; \
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((u_int8_t *)b)[3] = ((u_int8_t *)a)[3]; \
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}
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#define P_32_SWAP(a) { \
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u_int32_t _tmp; \
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P_32_COPY(a, &_tmp); \
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((u_int8_t *)a)[0] = ((u_int8_t *)&_tmp)[3]; \
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((u_int8_t *)a)[1] = ((u_int8_t *)&_tmp)[2]; \
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((u_int8_t *)a)[2] = ((u_int8_t *)&_tmp)[1]; \
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((u_int8_t *)a)[3] = ((u_int8_t *)&_tmp)[0]; \
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}
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/*
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* Little endian <==> big endian 16-bit swap macros.
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* M_16_SWAP swap a memory location
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* P_16_COPY copy potentially unaligned from one location to another
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* P_16_SWAP swap a referenced memory location
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*/
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#define M_16_SWAP(a) { \
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u_int16_t _tmp; \
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_tmp = (u_int16_t)a; \
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((u_int8_t *)&a)[0] = ((u_int8_t *)&_tmp)[1]; \
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((u_int8_t *)&a)[1] = ((u_int8_t *)&_tmp)[0]; \
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}
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#define P_16_COPY(a, b) { \
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((u_int8_t *)b)[0] = ((u_int8_t *)a)[0]; \
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((u_int8_t *)b)[1] = ((u_int8_t *)a)[1]; \
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}
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#define P_16_SWAP(a) { \
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u_int16_t _tmp; \
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P_16_COPY(a, &_tmp); \
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((u_int8_t *)a)[0] = ((u_int8_t *)&_tmp)[1]; \
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((u_int8_t *)a)[1] = ((u_int8_t *)&_tmp)[0]; \
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}
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#define SWAP32(p) { \
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P_32_SWAP(p); \
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(p) += sizeof(u_int32_t); \
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}
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#define SWAP16(p) { \
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P_16_SWAP(p); \
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(p) += sizeof(u_int16_t); \
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}
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#endif /* !_DB_SWAP_H_ */
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