235 lines
6.5 KiB
C
235 lines
6.5 KiB
C
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/*
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* Copyright 2013-2016 MongoDB, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef BSON_ENDIAN_H
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#define BSON_ENDIAN_H
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#if defined(__sun)
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# include <sys/byteorder.h>
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#endif
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#ifdef _MSC_VER
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# include "bson-stdint-win32.h"
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# define BSON_INLINE __inline
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#else
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# include <stdint.h>
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# define BSON_INLINE __inline__
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#endif
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#define BSON_BIG_ENDIAN 4321
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#define BSON_LITTLE_ENDIAN 1234
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/* WORDS_BIGENDIAN from pyconfig.h / Python.h */
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#ifdef WORDS_BIGENDIAN
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# define BSON_BYTE_ORDER BSON_BIG_ENDIAN
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#else
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# define BSON_BYTE_ORDER BSON_LITTLE_ENDIAN
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#endif
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#if defined(__sun)
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# define BSON_UINT16_SWAP_LE_BE(v) BSWAP_16((uint16_t)v)
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# define BSON_UINT32_SWAP_LE_BE(v) BSWAP_32((uint32_t)v)
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# define BSON_UINT64_SWAP_LE_BE(v) BSWAP_64((uint64_t)v)
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#elif defined(__clang__) && defined(__clang_major__) && defined(__clang_minor__) && \
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(__clang_major__ >= 3) && (__clang_minor__ >= 1)
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# if __has_builtin(__builtin_bswap16)
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# define BSON_UINT16_SWAP_LE_BE(v) __builtin_bswap16(v)
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# endif
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# if __has_builtin(__builtin_bswap32)
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# define BSON_UINT32_SWAP_LE_BE(v) __builtin_bswap32(v)
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# endif
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# if __has_builtin(__builtin_bswap64)
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# define BSON_UINT64_SWAP_LE_BE(v) __builtin_bswap64(v)
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# endif
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#elif defined(__GNUC__) && (__GNUC__ >= 4)
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# if __GNUC__ >= 4 && defined (__GNUC_MINOR__) && __GNUC_MINOR__ >= 3
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# define BSON_UINT32_SWAP_LE_BE(v) __builtin_bswap32 ((uint32_t)v)
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# define BSON_UINT64_SWAP_LE_BE(v) __builtin_bswap64 ((uint64_t)v)
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# endif
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# if __GNUC__ >= 4 && defined (__GNUC_MINOR__) && __GNUC_MINOR__ >= 8
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# define BSON_UINT16_SWAP_LE_BE(v) __builtin_bswap16 ((uint32_t)v)
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# endif
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#endif
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#ifndef BSON_UINT16_SWAP_LE_BE
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# define BSON_UINT16_SWAP_LE_BE(v) __bson_uint16_swap_slow ((uint16_t)v)
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#endif
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#ifndef BSON_UINT32_SWAP_LE_BE
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# define BSON_UINT32_SWAP_LE_BE(v) __bson_uint32_swap_slow ((uint32_t)v)
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#endif
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#ifndef BSON_UINT64_SWAP_LE_BE
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# define BSON_UINT64_SWAP_LE_BE(v) __bson_uint64_swap_slow ((uint64_t)v)
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#endif
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#if BSON_BYTE_ORDER == BSON_LITTLE_ENDIAN
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# define BSON_UINT16_FROM_LE(v) ((uint16_t)v)
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# define BSON_UINT16_TO_LE(v) ((uint16_t)v)
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# define BSON_UINT16_FROM_BE(v) BSON_UINT16_SWAP_LE_BE (v)
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# define BSON_UINT16_TO_BE(v) BSON_UINT16_SWAP_LE_BE (v)
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# define BSON_UINT32_FROM_LE(v) ((uint32_t)v)
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# define BSON_UINT32_TO_LE(v) ((uint32_t)v)
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# define BSON_UINT32_FROM_BE(v) BSON_UINT32_SWAP_LE_BE (v)
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# define BSON_UINT32_TO_BE(v) BSON_UINT32_SWAP_LE_BE (v)
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# define BSON_UINT64_FROM_LE(v) ((uint64_t)v)
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# define BSON_UINT64_TO_LE(v) ((uint64_t)v)
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# define BSON_UINT64_FROM_BE(v) BSON_UINT64_SWAP_LE_BE (v)
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# define BSON_UINT64_TO_BE(v) BSON_UINT64_SWAP_LE_BE (v)
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# define BSON_DOUBLE_FROM_LE(v) ((double)v)
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# define BSON_DOUBLE_TO_LE(v) ((double)v)
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#elif BSON_BYTE_ORDER == BSON_BIG_ENDIAN
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# define BSON_UINT16_FROM_LE(v) BSON_UINT16_SWAP_LE_BE (v)
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# define BSON_UINT16_TO_LE(v) BSON_UINT16_SWAP_LE_BE (v)
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# define BSON_UINT16_FROM_BE(v) ((uint16_t)v)
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# define BSON_UINT16_TO_BE(v) ((uint16_t)v)
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# define BSON_UINT32_FROM_LE(v) BSON_UINT32_SWAP_LE_BE (v)
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# define BSON_UINT32_TO_LE(v) BSON_UINT32_SWAP_LE_BE (v)
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# define BSON_UINT32_FROM_BE(v) ((uint32_t)v)
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# define BSON_UINT32_TO_BE(v) ((uint32_t)v)
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# define BSON_UINT64_FROM_LE(v) BSON_UINT64_SWAP_LE_BE (v)
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# define BSON_UINT64_TO_LE(v) BSON_UINT64_SWAP_LE_BE (v)
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# define BSON_UINT64_FROM_BE(v) ((uint64_t)v)
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# define BSON_UINT64_TO_BE(v) ((uint64_t)v)
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# define BSON_DOUBLE_FROM_LE(v) (__bson_double_swap_slow (v))
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# define BSON_DOUBLE_TO_LE(v) (__bson_double_swap_slow (v))
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#else
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# error "The endianness of target architecture is unknown."
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#endif
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/*
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*--------------------------------------------------------------------------
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*
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* __bson_uint16_swap_slow --
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*
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* Fallback endianness conversion for 16-bit integers.
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*
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* Returns:
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* The endian swapped version.
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*
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* Side effects:
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* None.
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*
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*--------------------------------------------------------------------------
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*/
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static BSON_INLINE uint16_t
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__bson_uint16_swap_slow (uint16_t v) /* IN */
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{
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return ((v & 0x00FF) << 8) |
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((v & 0xFF00) >> 8);
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}
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/*
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*--------------------------------------------------------------------------
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*
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* __bson_uint32_swap_slow --
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*
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* Fallback endianness conversion for 32-bit integers.
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*
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* Returns:
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* The endian swapped version.
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*
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* Side effects:
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* None.
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*
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*--------------------------------------------------------------------------
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*/
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static BSON_INLINE uint32_t
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__bson_uint32_swap_slow (uint32_t v) /* IN */
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{
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return ((v & 0x000000FFU) << 24) |
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((v & 0x0000FF00U) << 8) |
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((v & 0x00FF0000U) >> 8) |
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((v & 0xFF000000U) >> 24);
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}
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/*
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*--------------------------------------------------------------------------
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*
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* __bson_uint64_swap_slow --
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*
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* Fallback endianness conversion for 64-bit integers.
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*
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* Returns:
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* The endian swapped version.
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*
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* Side effects:
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* None.
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*
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*--------------------------------------------------------------------------
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*/
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static BSON_INLINE uint64_t
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__bson_uint64_swap_slow (uint64_t v) /* IN */
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{
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return ((v & 0x00000000000000FFULL) << 56) |
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((v & 0x000000000000FF00ULL) << 40) |
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((v & 0x0000000000FF0000ULL) << 24) |
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((v & 0x00000000FF000000ULL) << 8) |
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((v & 0x000000FF00000000ULL) >> 8) |
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((v & 0x0000FF0000000000ULL) >> 24) |
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((v & 0x00FF000000000000ULL) >> 40) |
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((v & 0xFF00000000000000ULL) >> 56);
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}
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/*
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*--------------------------------------------------------------------------
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*
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* __bson_double_swap_slow --
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*
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* Fallback endianness conversion for double floating point.
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*
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* Returns:
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* The endian swapped version.
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*
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* Side effects:
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* None.
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*
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*--------------------------------------------------------------------------
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*/
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static BSON_INLINE double
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__bson_double_swap_slow (double v) /* IN */
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{
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uint64_t uv;
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memcpy(&uv, &v, sizeof(v));
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uv = BSON_UINT64_SWAP_LE_BE(uv);
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memcpy(&v, &uv, sizeof(v));
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return v;
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}
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#endif /* BSON_ENDIAN_H */
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