/* * Copyright 2013-2016 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. */ #ifndef BSON_ENDIAN_H #define BSON_ENDIAN_H #if defined(__sun) # include #endif #ifdef _MSC_VER # include "bson-stdint-win32.h" # define BSON_INLINE __inline #else # include # define BSON_INLINE __inline__ #endif #define BSON_BIG_ENDIAN 4321 #define BSON_LITTLE_ENDIAN 1234 /* WORDS_BIGENDIAN from pyconfig.h / Python.h */ #ifdef WORDS_BIGENDIAN # define BSON_BYTE_ORDER BSON_BIG_ENDIAN #else # define BSON_BYTE_ORDER BSON_LITTLE_ENDIAN #endif #if defined(__sun) # define BSON_UINT16_SWAP_LE_BE(v) BSWAP_16((uint16_t)v) # define BSON_UINT32_SWAP_LE_BE(v) BSWAP_32((uint32_t)v) # define BSON_UINT64_SWAP_LE_BE(v) BSWAP_64((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 # if __GNUC__ >= 4 && defined (__GNUC_MINOR__) && __GNUC_MINOR__ >= 8 # define BSON_UINT16_SWAP_LE_BE(v) __builtin_bswap16 ((uint32_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_FROM_LE(v) ((uint16_t)v) # define BSON_UINT16_TO_LE(v) ((uint16_t)v) # define BSON_UINT16_FROM_BE(v) BSON_UINT16_SWAP_LE_BE (v) # 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_FROM_LE(v) BSON_UINT16_SWAP_LE_BE (v) # define BSON_UINT16_TO_LE(v) BSON_UINT16_SWAP_LE_BE (v) # define BSON_UINT16_FROM_BE(v) ((uint16_t)v) # 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 BSON_INLINE uint16_t __bson_uint16_swap_slow (uint16_t v) /* IN */ { 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 BSON_INLINE uint32_t __bson_uint32_swap_slow (uint32_t v) /* IN */ { 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 BSON_INLINE uint64_t __bson_uint64_swap_slow (uint64_t v) /* IN */ { 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 BSON_INLINE double __bson_double_swap_slow (double v) /* IN */ { uint64_t uv; memcpy(&uv, &v, sizeof(v)); uv = BSON_UINT64_SWAP_LE_BE(uv); memcpy(&v, &uv, sizeof(v)); return v; } #endif /* BSON_ENDIAN_H */