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