mirror of
https://github.com/RGBCube/serenity
synced 2025-10-31 19:52:45 +00:00
44 lines
816 B
C++
44 lines
816 B
C++
/*
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* Copyright (c) 2019-2020, Andrew Kaster <akaster@serenityos.org>
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* Copyright (c) 2020, Itamar S. <itamar8910@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/StringView.h>
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namespace ELF {
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constexpr u32 compute_sysv_hash(StringView name)
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{
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// SYSV ELF hash algorithm
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// Note that the GNU HASH algorithm has less collisions
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u32 hash = 0;
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for (auto ch : name) {
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hash = hash << 4;
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hash += ch;
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const u32 top_nibble_of_hash = hash & 0xf0000000u;
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hash ^= top_nibble_of_hash >> 24;
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hash &= ~top_nibble_of_hash;
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}
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return hash;
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}
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constexpr u32 compute_gnu_hash(StringView name)
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{
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// GNU ELF hash algorithm
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u32 hash = 5381;
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for (auto ch : name)
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hash = hash * 33 + ch;
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return hash;
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}
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}
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