ext/bson/bson-endian.h
/*
* Copyright (C) 2015-2020 MongoDB Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#if (defined(_WIN16) || defined(_WIN32) || defined(_WIN64)) && !defined(__WINDOWS__)
# define __WINDOWS__
# include <winsock2.h>
#else
# include <arpa/inet.h>
# include <sys/types.h>
#endif
#define BSON_BIG_ENDIAN 4321
#define BSON_LITTLE_ENDIAN 1234
#if defined(__sun)
# include <sys/byteorder.h>
# if defined(_LITTLE_ENDIAN)
# define BSON_BYTE_ORDER 1234
# else
# define BSON_BYTE_ORDER 4321
# endif
#endif
/* See a similar check in ruby's sha2.h */
# ifndef BSON_BYTE_ORDER
# ifdef WORDS_BIGENDIAN
# define BSON_BYTE_ORDER BSON_BIG_ENDIAN
# else
# define BSON_BYTE_ORDER BSON_LITTLE_ENDIAN
# endif
# endif /* BSON_BYTE_ORDER */
#if defined(__sun)
# define BSON_UINT16_SWAP_LE_BE(v) __bson_uint16_swap_slow((uint16_t)v)
# define BSON_UINT32_SWAP_LE_BE(v) __bson_uint32_swap_slow((uint32_t)v)
# define BSON_UINT64_SWAP_LE_BE(v) __bson_uint64_swap_slow((uint64_t)v)
#elif defined(__clang__) && defined(__clang_major__) && defined(__clang_minor__) && \
(__clang_major__ >= 3) && (__clang_minor__ >= 1)
# if __has_builtin(__builtin_bswap16)
# define BSON_UINT16_SWAP_LE_BE(v) __builtin_bswap16(v)
# endif
# if __has_builtin(__builtin_bswap32)
# define BSON_UINT32_SWAP_LE_BE(v) __builtin_bswap32(v)
# endif
# if __has_builtin(__builtin_bswap64)
# define BSON_UINT64_SWAP_LE_BE(v) __builtin_bswap64(v)
# endif
#elif defined(__GNUC__) && (__GNUC__ >= 4)
# if __GNUC__ > 4 || (defined (__GNUC_MINOR__) && __GNUC_MINOR__ >= 3)
# define BSON_UINT32_SWAP_LE_BE(v) __builtin_bswap32 ((uint32_t)v)
# define BSON_UINT64_SWAP_LE_BE(v) __builtin_bswap64 ((uint64_t)v)
# endif
#endif
#ifndef BSON_UINT16_SWAP_LE_BE
# define BSON_UINT16_SWAP_LE_BE(v) __bson_uint16_swap_slow((uint16_t)v)
#endif
#ifndef BSON_UINT32_SWAP_LE_BE
# define BSON_UINT32_SWAP_LE_BE(v) __bson_uint32_swap_slow((uint32_t)v)
#endif
#ifndef BSON_UINT64_SWAP_LE_BE
# define BSON_UINT64_SWAP_LE_BE(v) __bson_uint64_swap_slow((uint64_t)v)
#endif
#if BSON_BYTE_ORDER == BSON_LITTLE_ENDIAN
# define BSON_UINT16_TO_BE(v) BSON_UINT16_SWAP_LE_BE(v)
# define BSON_UINT32_FROM_LE(v) ((uint32_t)v)
# define BSON_UINT32_TO_LE(v) ((uint32_t)v)
# define BSON_UINT32_FROM_BE(v) BSON_UINT32_SWAP_LE_BE(v)
# define BSON_UINT32_TO_BE(v) BSON_UINT32_SWAP_LE_BE(v)
# define BSON_UINT64_FROM_LE(v) ((uint64_t)v)
# define BSON_UINT64_TO_LE(v) ((uint64_t)v)
# define BSON_UINT64_FROM_BE(v) BSON_UINT64_SWAP_LE_BE(v)
# define BSON_UINT64_TO_BE(v) BSON_UINT64_SWAP_LE_BE(v)
# define BSON_DOUBLE_FROM_LE(v) ((double)v)
# define BSON_DOUBLE_TO_LE(v) ((double)v)
#elif BSON_BYTE_ORDER == BSON_BIG_ENDIAN
# define BSON_UINT16_TO_BE(v) ((uint16_t)v)
# define BSON_UINT32_FROM_LE(v) BSON_UINT32_SWAP_LE_BE(v)
# define BSON_UINT32_TO_LE(v) BSON_UINT32_SWAP_LE_BE(v)
# define BSON_UINT32_FROM_BE(v) ((uint32_t)v)
# define BSON_UINT32_TO_BE(v) ((uint32_t)v)
# define BSON_UINT64_FROM_LE(v) BSON_UINT64_SWAP_LE_BE(v)
# define BSON_UINT64_TO_LE(v) BSON_UINT64_SWAP_LE_BE(v)
# define BSON_UINT64_FROM_BE(v) ((uint64_t)v)
# define BSON_UINT64_TO_BE(v) ((uint64_t)v)
# define BSON_DOUBLE_FROM_LE(v) (__bson_double_swap_slow(v))
# define BSON_DOUBLE_TO_LE(v) (__bson_double_swap_slow(v))
#else
# error "The endianness of target architecture is unknown."
#endif
uint16_t __bson_uint16_swap_slow(uint16_t v);
uint32_t __bson_uint32_swap_slow(uint32_t v);
uint64_t __bson_uint64_swap_slow(uint64_t v);
double __bson_double_swap_slow(double v);