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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
/*
* This file is open source software, licensed to you under the terms
* of the Apache License, Version 2.0 (the "License"). See the NOTICE file
* distributed with this work for additional information regarding copyright
* ownership. 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 (C) 2014 Cloudius Systems, Ltd.
*/
#ifndef CEPH_MSG_CHECKSUM_H_
#define CEPH_MSG_CHECKSUM_H_
#include <cstdint>
#include <cstddef>
#include <arpa/inet.h>
#include "Packet.h"
uint16_t ip_checksum(const void* data, size_t len);
struct checksummer {
__int128 csum = 0;
bool odd = false;
void sum(const char* data, size_t len);
void sum(const Packet& p);
void sum(uint8_t data) {
if (!odd) {
csum += data << 8;
} else {
csum += data;
}
odd = !odd;
}
void sum(uint16_t data) {
if (odd) {
sum(uint8_t(data >> 8));
sum(uint8_t(data));
} else {
csum += data;
}
}
void sum(uint32_t data) {
if (odd) {
sum(uint16_t(data));
sum(uint16_t(data >> 16));
} else {
csum += data;
}
}
void sum_many() {}
template <typename T0, typename... T>
void sum_many(T0 data, T... rest) {
sum(data);
sum_many(rest...);
}
uint16_t get() const;
};
#endif /* CEPH_MSG_CHECKSUM_H_ */
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