mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-09-21 02:08:12 +03:00
45 lines
816 B
C++
45 lines
816 B
C++
/*
|
|
* 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;
|
|
}
|
|
|
|
}
|