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Filename :
native-endian.h
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/* * Copyright 2015 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 #ifndef BSON_BYTE_ORDER # if BYTE_ORDER == LITTLE_ENDIAN # define BSON_BYTE_ORDER 1234 # elif BYTE_ORDER == BIG_ENDIAN # define BSON_BYTE_ORDER 4321 # endif #endif #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 /* *-------------------------------------------------------------------------- * * __bson_uint16_swap_slow -- * * Fallback endianness conversion for 16-bit integers. * * Returns: * The endian swapped version. * * Side effects: * None. * *-------------------------------------------------------------------------- */ static uint16_t __bson_uint16_swap_slow(uint16_t v) { return ((v & 0x00FF) << 8) | ((v & 0xFF00) >> 8); } /* *-------------------------------------------------------------------------- * * __bson_uint32_swap_slow -- * * Fallback endianness conversion for 32-bit integers. * * Returns: * The endian swapped version. * * Side effects: * None. * *-------------------------------------------------------------------------- */ static uint32_t __bson_uint32_swap_slow(uint32_t v) { return ((v & 0x000000FFU) << 24) | ((v & 0x0000FF00U) << 8) | ((v & 0x00FF0000U) >> 8) | ((v & 0xFF000000U) >> 24); } /* *-------------------------------------------------------------------------- * * __bson_uint64_swap_slow -- * * Fallback endianness conversion for 64-bit integers. * * Returns: * The endian swapped version. * * Side effects: * None. * *-------------------------------------------------------------------------- */ static uint64_t __bson_uint64_swap_slow(uint64_t v) { return ((v & 0x00000000000000FFULL) << 56) | ((v & 0x000000000000FF00ULL) << 40) | ((v & 0x0000000000FF0000ULL) << 24) | ((v & 0x00000000FF000000ULL) << 8) | ((v & 0x000000FF00000000ULL) >> 8) | ((v & 0x0000FF0000000000ULL) >> 24) | ((v & 0x00FF000000000000ULL) >> 40) | ((v & 0xFF00000000000000ULL) >> 56); } /* *-------------------------------------------------------------------------- * * __bson_double_swap_slow -- * * Fallback endianness conversion for double floating point. * * Returns: * The endian swapped version. * * Side effects: * None. * *-------------------------------------------------------------------------- */ static double __bson_double_swap_slow(double v) { uint64_t uv; memcpy(&uv, &v, sizeof(v)); uv = BSON_UINT64_SWAP_LE_BE(uv); memcpy(&v, &uv, sizeof(v)); return v; }