tdesktop/Telegram/SourceFiles/api/api_hash.h

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/*
This file is part of Telegram Desktop,
the official desktop application for the Telegram messaging service.
For license and copyright information please follow this link:
https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
*/
#pragma once
namespace Api {
[[nodiscard]] inline uint32 HashInit() {
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return 0;
}
inline void HashUpdate(uint32 &already, uint32 value) {
already = (already * 20261) + uint32(value);
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}
inline void HashUpdate(uint32 &already, int32 value) {
HashUpdate(already, uint32(value));
}
inline void HashUpdate(uint32 &already, uint64 value) {
HashUpdate(already, uint32(value >> 32));
HashUpdate(already, uint32(value & 0xFFFFFFFFULL));
}
[[nodiscard]] inline int32 HashFinalize(uint32 already) {
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return int32(already & 0x7FFFFFFF);
}
template <typename IntRange>
[[nodiscard]] inline int32 CountHash(IntRange &&range) {
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auto result = HashInit();
for (const auto value : range) {
HashUpdate(result, value);
}
return HashFinalize(result);
}
} // namespace Api