114 lines
3.9 KiB
C++
114 lines
3.9 KiB
C++
/*
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* Copyright (c) 2016, The OpenThread Authors.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the copyright holder nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* @file
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* This file includes definitions for byte-ordering encoding.
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*/
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#ifndef ENCODING_HPP_
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#define ENCODING_HPP_
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#include <limits.h>
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#include <stdint.h>
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namespace Thread {
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namespace Encoding {
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inline uint16_t Swap16(uint16_t v)
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{
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return
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(((v & 0x00ffU) << 8) & 0xff00) |
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(((v & 0xff00U) >> 8) & 0x00ff);
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}
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inline uint32_t Swap32(uint32_t v)
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{
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return
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((v & static_cast<uint32_t>(0x000000ffUL)) << 24) |
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((v & static_cast<uint32_t>(0x0000ff00UL)) << 8) |
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((v & static_cast<uint32_t>(0x00ff0000UL)) >> 8) |
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((v & static_cast<uint32_t>(0xff000000UL)) >> 24);
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}
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inline uint64_t Swap64(uint64_t v)
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{
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return
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((v & static_cast<uint64_t>(0x00000000000000ffULL)) << 56) |
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((v & static_cast<uint64_t>(0x000000000000ff00ULL)) << 40) |
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((v & static_cast<uint64_t>(0x0000000000ff0000ULL)) << 24) |
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((v & static_cast<uint64_t>(0x00000000ff000000ULL)) << 8) |
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((v & static_cast<uint64_t>(0x000000ff00000000ULL)) >> 8) |
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((v & static_cast<uint64_t>(0x0000ff0000000000ULL)) >> 24) |
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((v & static_cast<uint64_t>(0x00ff000000000000ULL)) >> 40) |
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((v & static_cast<uint64_t>(0xff00000000000000ULL)) >> 56);
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}
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#define BitVectorBytes(x) \
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(((x) + (CHAR_BIT-1)) / CHAR_BIT)
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namespace BigEndian {
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#if BYTE_ORDER_BIG_ENDIAN
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inline uint16_t HostSwap16(uint16_t v) { return v; }
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inline uint32_t HostSwap32(uint32_t v) { return v; }
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inline uint64_t HostSwap64(uint64_t v) { return v; }
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#else /* BYTE_ORDER_LITTLE_ENDIAN */
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inline uint16_t HostSwap16(uint16_t v) { return Swap16(v); }
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inline uint32_t HostSwap32(uint32_t v) { return Swap32(v); }
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inline uint64_t HostSwap64(uint64_t v) { return Swap64(v); }
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#endif // LITTLE_ENDIAN
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} // namespace BigEndian
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namespace LittleEndian {
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#if BYTE_ORDER_BIG_ENDIAN
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inline uint16_t HostSwap16(uint16_t v) { return Swap16(v); }
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inline uint32_t HostSwap32(uint32_t v) { return Swap32(v); }
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inline uint64_t HostSwap64(uint64_t v) { return Swap64(v); }
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#else /* BYTE_ORDER_LITTLE_ENDIAN */
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inline uint16_t HostSwap16(uint16_t v) { return v; }
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inline uint32_t HostSwap32(uint32_t v) { return v; }
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inline uint64_t HostSwap64(uint64_t v) { return v; }
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#endif
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} // namespace LittleEndian
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} // namespace Encoding
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} // namespace Thread
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#endif // ENCODING_HPP_
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