152 lines
5.2 KiB
C
152 lines
5.2 KiB
C
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/****************************************************************************
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* include/endian.h
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*
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* Copyright (C) 2018 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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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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*
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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
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* 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 COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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#ifndef __INCLUDE_ENDIAN_H
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#define __INCLUDE_ENDIAN_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <nuttx/compiler.h>
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#include <stdint.h>
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/****************************************************************************
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* Preprocessor definitions
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****************************************************************************/
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/* The endian.h header must define at least the following macros for use in
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* determining host byte order for integer types:
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*
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* BYTE_ORDER This macro will have a value equal to one of the *_ENDIAN
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* macros in this header.
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* LITTLE_ENDIAN If BYTE_ORDER == LITTLE_ENDIAN, the host byte order is
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* from least significant to most significant.
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* BIG_ENDIAN If BYTE_ORDER == BIG_ENDIAN, the host byte order is from
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* most significant to least significant.
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*/
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#define LITTLE_ENDIAN 1234
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#define BIG_ENDIAN 4321
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/* Common byte swapping macros */
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#define __SWAP_UINT16_ISMACRO 1
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#undef __SWAP_UINT32_ISMACRO
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#ifdef __SWAP_UINT16_ISMACRO
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# define __swap_uint16(n) \
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(uint16_t)(((((uint16_t)(n)) & 0x00ff) << 8) | \
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((((uint16_t)(n)) >> 8) & 0x00ff))
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#endif
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#ifdef __SWAP_UINT32_ISMACRO
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# define __swap_uint32(n) \
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(uint32_t)(((((uint32_t)(n)) & 0x000000ffUL) << 24) | \
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((((uint32_t)(n)) & 0x0000ff00UL) << 8) | \
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((((uint32_t)(n)) & 0x00ff0000UL) >> 8) | \
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((((uint32_t)(n)) & 0xff000000UL) >> 24))
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#endif
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/* Endian-specific definitions */
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#ifdef CONFIG_ENDIAN_BIG
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/* Big-endian byte order */
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# define BYTE_ORDER BIG_ENDIAN
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/* Big-endian byte order macros */
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# define htobe16(n) (n)
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# define htole16(n) __swap_uint16((uint16_t)n)
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# define be16toh(n) (n)
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# define le16toh(n) __swap_uint16((uint16_t)n)
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# define htobe32(n) (n)
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# define htole32(n) __swap_uint32((uint32_t)n)
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# define be32toh(n) (n)
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# define le32toh(n) __swap_uint32(n)
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# ifdef CONFIG_HAVE_LONG_LONG
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# define htobe64(n) (n)
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# define htole64(n) __swap_uint64((uint64_t)n)
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# define be64toh(n) (n)
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# define le64toh(n) __swap_uint64(uint64_t)n)
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# endif
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#else
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/* Little-endian byte order */
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# define BYTE_ORDER LITTLE_ENDIAN
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/* Little-endian byte order macros */
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# define htobe16(n) __swap_uint16((uint16_t)n)
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# define htole16(n) (n)
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# define be16toh(n) __swap_uint16((uint16_t)n)
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# define le16toh(n) (n)
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# define htobe32(n) __swap_uint32((uint32_t)n)
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# define htole32(n) (n)
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# define be32toh(n) __swap_uint32((uint32_t)n)
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# define le32toh(n) (n)
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# ifdef CONFIG_HAVE_LONG_LONG
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# define htobe64(n) __swap_uint64(uint64_t)n)
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# define htole64(n) (n)
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# define be64toh(n) __swap_uint64(uint64_t)n)
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# define le64toh(n) (n)
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# endif
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#endif
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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#ifndef __SWAP_UINT16_ISMACRO
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uint16_t __swap_uint16(uint16_t n);
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#endif
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#ifndef __SWAP_UINT32_ISMACRO
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uint32_t __swap_uint32(uint32_t n);
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#endif
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#if CONFIG_HAVE_LONG_LONG
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uint64_t __swap_uint64(uint64_t n);
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#endif
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#endif /* __INCLUDE_ENDIAN_H */
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