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/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*
*/
#include "qpid/linearstore/journal/Checksum.h"
namespace qpid {
namespace linearstore {
namespace journal {
Checksum::Checksum() : a(1UL), b(0UL), MOD_ADLER(65521UL) {}
Checksum::~Checksum() {}
void Checksum::addData(const unsigned char* data, const std::size_t len) {
for (uint32_t i = 0; i < len; i++) {
a = (a + data[i]) % MOD_ADLER;
b = (a + b) % MOD_ADLER;
}
}
uint32_t Checksum::getChecksum() {
return (b << 16) | a;
}
}}}
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