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https://github.com/OpenRCT2/OpenRCT2
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d46e4a9bb1
* Start a network serialiser for entities will be used only for checksums and replay diffs * Continue work * Use the new serailser for checksums * Use new serialiser for replays * keep compilers happy * Try create checksum stream * Fix compiling * Split off class into seperate file * Update Xcode project * Increment network version * Fix pragma mistake * Fix none network builds * Update replays * Improve ChecksumStream and use FNV internally * Small cleanups * satisfy compilers * Revert change of checksum size to simplfy rerecording * Zero initialise data * Fix serialiser * Update replays again Co-authored-by: Michael Steenbeek <m.o.steenbeek@gmail.com> Co-authored-by: Matt <m.moninger.h@gmail.com>
48 lines
1.4 KiB
C++
48 lines
1.4 KiB
C++
/*****************************************************************************
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* Copyright (c) 2014-2021 OpenRCT2 developers
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*
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* For a complete list of all authors, please refer to contributors.md
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* Interested in contributing? Visit https://github.com/OpenRCT2/OpenRCT2
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*
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* OpenRCT2 is licensed under the GNU General Public License version 3.
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*****************************************************************************/
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#include "ChecksumStream.h"
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#include "Endianness.h"
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#include <cstddef>
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namespace OpenRCT2
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{
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#ifndef DISABLE_NETWORK
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ChecksumStream::ChecksumStream(std::array<std::byte, 20>& buf)
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: _checksum(buf)
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{
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uint64_t* hash = reinterpret_cast<uint64_t*>(_checksum.data());
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*hash = Seed;
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}
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void ChecksumStream::Write(const void* buffer, uint64_t length)
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{
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uint64_t* hash = reinterpret_cast<uint64_t*>(_checksum.data());
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for (size_t i = 0; i < length; i += sizeof(uint64_t))
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{
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const auto maxLen = std::min<size_t>(sizeof(uint64_t), length - i);
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uint64_t temp{};
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std::memcpy(&temp, reinterpret_cast<const std::byte*>(buffer) + i, maxLen);
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// Always use value as little endian, most common systems are little.
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# if defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)
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temp = ByteSwapBE(temp);
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# endif
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*hash ^= temp;
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*hash *= Prime;
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}
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}
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#endif
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} // namespace OpenRCT2
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