141 lines
4.6 KiB
C
141 lines
4.6 KiB
C
/****************************************************************************
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* include/endian.h
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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 __LITTLE_ENDIAN 1234
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#define BIG_ENDIAN 4321
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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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# 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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# 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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