blob: b98c85767b420b85605ac3470d485ad3fc7f50a8 [file] [log] [blame]
// Copyright (c) 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/third_party/quiche/src/quic/qbone/platform/internet_checksum.h"
namespace quic {
void InternetChecksum::Update(const char* data, size_t size) {
const char* current;
for (current = data; current + 1 < data + size; current += 2) {
accumulator_ += *reinterpret_cast<const uint16_t*>(current);
}
if (current < data + size) {
accumulator_ += *reinterpret_cast<const uint8_t*>(current);
}
}
void InternetChecksum::Update(const uint8_t* data, size_t size) {
Update(reinterpret_cast<const char*>(data), size);
}
uint16_t InternetChecksum::Value() const {
uint32_t total = accumulator_;
while (total & 0xffff0000u) {
total = (total >> 16u) + (total & 0xffffu);
}
return ~static_cast<uint16_t>(total);
}
} // namespace quic