libcruft-util/hash/bsdsum.cpp

/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * Copyright 2010-2018 Danny Robson <danny@nerdcruft.net>
 */

#include "bsdsum.hpp"

#include "../bitwise.hpp"

using util::hash::bsdsum;


///////////////////////////////////////////////////////////////////////////////
typename bsdsum::digest_t
bsdsum::operator() (util::view<const uint8_t*> data) const noexcept
{
    digest_t accum = 0;

    for (const auto i: data)
        accum = util::rotater (accum, 1) + i;

    return accum;
}