From 36d22d82aa202bb199967e9512281e9a53db42c9 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 21:33:14 +0200 Subject: Adding upstream version 115.7.0esr. Signed-off-by: Daniel Baumann --- mfbt/HashFunctions.cpp | 37 +++++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) create mode 100644 mfbt/HashFunctions.cpp (limited to 'mfbt/HashFunctions.cpp') diff --git a/mfbt/HashFunctions.cpp b/mfbt/HashFunctions.cpp new file mode 100644 index 0000000000..4cb04e58a3 --- /dev/null +++ b/mfbt/HashFunctions.cpp @@ -0,0 +1,37 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +/* Implementations of hash functions. */ + +#include "mozilla/HashFunctions.h" +#include "mozilla/Types.h" + +#include + +namespace mozilla { + +uint32_t HashBytes(const void* aBytes, size_t aLength) { + uint32_t hash = 0; + const char* b = reinterpret_cast(aBytes); + + /* Walk word by word. */ + size_t i = 0; + for (; i < aLength - (aLength % sizeof(size_t)); i += sizeof(size_t)) { + /* Do an explicitly unaligned load of the data. */ + size_t data; + memcpy(&data, b + i, sizeof(size_t)); + + hash = AddToHash(hash, data); + } + + /* Get the remaining bytes. */ + for (; i < aLength; i++) { + hash = AddToHash(hash, b[i]); + } + return hash; +} + +} /* namespace mozilla */ -- cgit v1.2.3