mirror of
https://github.com/matrix-construct/construct
synced 2024-07-07 02:58:39 +02:00
51 lines
1.7 KiB
C++
51 lines
1.7 KiB
C++
// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2018 Jason Volk
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice is present in all copies.
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//
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// THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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// IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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// DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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// INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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// 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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#pragma once
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#define HAVE_IRCD_UTIL_BSWAP_H
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namespace ircd::util
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{
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template<class T> T &bswap(T *const &val);
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template<class T> T bswap(const T &val);
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}
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/// Reverse endian of data pointed to; return reference
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template<class T>
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T &
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ircd::util::bswap(T *const &val)
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{
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assert(val != nullptr);
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const auto ptr{reinterpret_cast<uint8_t *>(val)};
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std::reverse(ptr, ptr + sizeof(T));
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return *val;
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}
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/// Reverse endian of T returning value copy
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template<class T>
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T
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ircd::util::bswap(const T &val)
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{
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T ret;
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const auto valptr{reinterpret_cast<const uint8_t *>(&val)};
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const auto retptr{reinterpret_cast<uint8_t *>(&ret)};
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std::reverse_copy(valptr, valptr + sizeof(T), retptr);
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return ret;
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}
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