text: /*
   * 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.
   */
  
  
  #ifndef BSON_ENDIAN_H
  #define BSON_ENDIAN_H
  
  
  //#if !defined(BSON_INSIDE) && !defined(BSON_COMPILATION)
  //#error "Only <bson.h> can be included directly."
  //#endif
  
  
  #if defined(__sun)
  #include <sys/byteorder.h>
  #endif
  
  #include "bson-config.h"
  #include "bson-macros.h"
  #include "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_ASSERT (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 */
  