| /**************************************************************************** |
| * include/endian.h |
| * |
| * Copyright (C) 2018 Gregory Nutt. All rights reserved. |
| * Author: Gregory Nutt <gnutt@nuttx.org> |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * 3. Neither the name NuttX nor the names of its contributors may be |
| * used to endorse or promote products derived from this software |
| * without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
| * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
| * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS |
| * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
| * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN |
| * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| * POSSIBILITY OF SUCH DAMAGE. |
| * |
| ****************************************************************************/ |
| |
| #ifndef __INCLUDE_ENDIAN_H |
| #define __INCLUDE_ENDIAN_H |
| |
| /**************************************************************************** |
| * Included Files |
| ****************************************************************************/ |
| |
| #include <nuttx/config.h> |
| #include <nuttx/compiler.h> |
| #include <stdint.h> |
| |
| /**************************************************************************** |
| * Preprocessor definitions |
| ****************************************************************************/ |
| |
| /* The endian.h header must define at least the following macros for use in |
| * determining host byte order for integer types: |
| * |
| * BYTE_ORDER This macro will have a value equal to one of the *_ENDIAN |
| * macros in this header. |
| * LITTLE_ENDIAN If BYTE_ORDER == LITTLE_ENDIAN, the host byte order is |
| * from least significant to most significant. |
| * BIG_ENDIAN If BYTE_ORDER == BIG_ENDIAN, the host byte order is from |
| * most significant to least significant. |
| */ |
| |
| #define LITTLE_ENDIAN 1234 |
| #define BIG_ENDIAN 4321 |
| |
| /* Common byte swapping macros */ |
| |
| #define __SWAP_UINT16_ISMACRO 1 |
| #undef __SWAP_UINT32_ISMACRO |
| |
| #ifdef __SWAP_UINT16_ISMACRO |
| # define __swap_uint16(n) \ |
| (uint16_t)(((((uint16_t)(n)) & 0x00ff) << 8) | \ |
| ((((uint16_t)(n)) >> 8) & 0x00ff)) |
| #endif |
| |
| #ifdef __SWAP_UINT32_ISMACRO |
| # define __swap_uint32(n) \ |
| (uint32_t)(((((uint32_t)(n)) & 0x000000ffUL) << 24) | \ |
| ((((uint32_t)(n)) & 0x0000ff00UL) << 8) | \ |
| ((((uint32_t)(n)) & 0x00ff0000UL) >> 8) | \ |
| ((((uint32_t)(n)) & 0xff000000UL) >> 24)) |
| #endif |
| |
| /* Endian-specific definitions */ |
| |
| #ifdef CONFIG_ENDIAN_BIG |
| /* Big-endian byte order */ |
| |
| # define BYTE_ORDER BIG_ENDIAN |
| |
| /* Big-endian byte order macros */ |
| |
| # define htobe16(n) (n) |
| # define htole16(n) __swap_uint16((uint16_t)n) |
| # define be16toh(n) (n) |
| # define le16toh(n) __swap_uint16((uint16_t)n) |
| |
| # define htobe32(n) (n) |
| # define htole32(n) __swap_uint32((uint32_t)n) |
| # define be32toh(n) (n) |
| # define le32toh(n) __swap_uint32(n) |
| |
| # ifdef CONFIG_HAVE_LONG_LONG |
| # define htobe64(n) (n) |
| # define htole64(n) __swap_uint64((uint64_t)n) |
| # define be64toh(n) (n) |
| # define le64toh(n) __swap_uint64((uint64_t)n) |
| # endif |
| |
| #else |
| /* Little-endian byte order */ |
| |
| # define BYTE_ORDER LITTLE_ENDIAN |
| |
| /* Little-endian byte order macros */ |
| |
| # define htobe16(n) __swap_uint16((uint16_t)n) |
| # define htole16(n) (n) |
| # define be16toh(n) __swap_uint16((uint16_t)n) |
| # define le16toh(n) (n) |
| |
| # define htobe32(n) __swap_uint32((uint32_t)n) |
| # define htole32(n) (n) |
| # define be32toh(n) __swap_uint32((uint32_t)n) |
| # define le32toh(n) (n) |
| |
| # ifdef CONFIG_HAVE_LONG_LONG |
| # define htobe64(n) __swap_uint64((uint64_t)n) |
| # define htole64(n) (n) |
| # define be64toh(n) __swap_uint64((uint64_t)n) |
| # define le64toh(n) (n) |
| # endif |
| #endif |
| |
| /**************************************************************************** |
| * Public Function Prototypes |
| ****************************************************************************/ |
| |
| #ifndef __SWAP_UINT16_ISMACRO |
| uint16_t __swap_uint16(uint16_t n); |
| #endif |
| |
| #ifndef __SWAP_UINT32_ISMACRO |
| uint32_t __swap_uint32(uint32_t n); |
| #endif |
| |
| #if CONFIG_HAVE_LONG_LONG |
| uint64_t __swap_uint64(uint64_t n); |
| #endif |
| |
| #endif /* __INCLUDE_ENDIAN_H */ |