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84 lines
2.4 KiB
84 lines
2.4 KiB
// Copyright 2020 The Pigweed Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not
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// use this file except in compliance with the License. You may obtain a copy of
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// the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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// License for the specific language governing permissions and limitations under
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// the License.
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#include "pw_checksum/crc16_ccitt.h"
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#include <string_view>
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#include "gtest/gtest.h"
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namespace pw::checksum {
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namespace {
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// The expected CRC16 values were calculated using
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//
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// http://www.sunshine2k.de/coding/javascript/crc/crc_js.html
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//
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// with polynomial 0x1021, initial value 0xFFFF.
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constexpr uint8_t kBytes[] = {1, 2, 3, 4, 5, 6, 7, 8, 9};
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constexpr uint16_t kBufferCrc = 0x3B0A;
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constexpr std::string_view kString =
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"In the beginning the Universe was created. This has made a lot of "
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"people very angry and been widely regarded as a bad move.";
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constexpr uint16_t kStringCrc = 0xC184;
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TEST(Crc16, Empty) {
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EXPECT_EQ(Crc16Ccitt::Calculate(std::span<std::byte>()),
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Crc16Ccitt::kInitialValue);
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}
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TEST(Crc16, ByteByByte) {
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uint16_t crc = Crc16Ccitt::kInitialValue;
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for (size_t i = 0; i < sizeof(kBytes); i++) {
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crc = Crc16Ccitt::Calculate(std::byte{kBytes[i]}, crc);
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}
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EXPECT_EQ(crc, kBufferCrc);
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}
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TEST(Crc16, Buffer) {
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EXPECT_EQ(Crc16Ccitt::Calculate(std::as_bytes(std::span(kBytes))),
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kBufferCrc);
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}
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TEST(Crc16, String) {
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EXPECT_EQ(Crc16Ccitt::Calculate(std::as_bytes(std::span(kString))),
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kStringCrc);
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}
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TEST(Crc16Class, Buffer) {
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Crc16Ccitt crc16;
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crc16.Update(std::as_bytes(std::span(kBytes)));
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EXPECT_EQ(crc16.value(), kBufferCrc);
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}
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TEST(Crc16Class, String) {
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Crc16Ccitt crc16;
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crc16.Update(std::as_bytes(std::span(kString)));
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EXPECT_EQ(crc16.value(), kStringCrc);
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}
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extern "C" uint16_t CallChecksumCrc16Ccitt(const void* data, size_t size_bytes);
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TEST(Crc16FromC, Buffer) {
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EXPECT_EQ(CallChecksumCrc16Ccitt(kBytes, sizeof(kBytes)), kBufferCrc);
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}
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TEST(Crc16FromC, String) {
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EXPECT_EQ(CallChecksumCrc16Ccitt(kString.data(), kString.size()), kStringCrc);
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}
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} // namespace
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} // namespace pw::checksum
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