/* * Copyright 2013 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. */ #include "bson/bson-prelude.h" #ifndef BSON_ENDIAN_H #define BSON_ENDIAN_H #if defined(__sun) #include #endif #include "bson/bson-config.h" #include "bson/bson-macros.h" #include "bson/bson-compat.h" BSON_BEGIN_DECLS #define BSON_BIG_ENDIAN 4321 #define BSON_LITTLE_ENDIAN 1234 #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. * *-------------------------------------------------------------------------- */ BSON_STATIC_ASSERT2 (sizeof_uint64_t, sizeof (double) == sizeof (uint64_t)); 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; } BSON_END_DECLS #endif /* BSON_ENDIAN_H */