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/*
* Copyright (C) 2015-2020 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 <string.h>
#include <stdint.h>
#include "bson-endian.h"
/*
*--------------------------------------------------------------------------
*
* __bson_uint16_swap_slow --
*
* Fallback endianness conversion for 16-bit integers.
*
* Returns:
* The endian swapped version.
*
* Side effects:
* None.
*
*--------------------------------------------------------------------------
*/
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.
*
*--------------------------------------------------------------------------
*/
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.
*
*--------------------------------------------------------------------------
*/
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.
*
*--------------------------------------------------------------------------
*/
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;
}
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