зеркало из https://github.com/mozilla/pjs.git
40 строки
1013 B
C++
40 строки
1013 B
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
|
|
* vim: set ts=8 sw=4 et tw=99 ft=cpp:
|
|
*
|
|
* 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 <string.h>
|
|
|
|
namespace mozilla {
|
|
|
|
MFBT_API(uint32_t)
|
|
HashBytes(const void* bytes, size_t length)
|
|
{
|
|
uint32_t hash = 0;
|
|
const char* b = reinterpret_cast<const char*>(bytes);
|
|
|
|
/* Walk word by word. */
|
|
size_t i = 0;
|
|
for (; i < length - (length % 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, sizeof(data));
|
|
}
|
|
|
|
/* Get the remaining bytes. */
|
|
for (; i < length; i++) {
|
|
hash = AddToHash(hash, b[i]);
|
|
}
|
|
|
|
return hash;
|
|
}
|
|
|
|
} /* namespace mozilla */
|