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// Copyright 2017 The CRC32C Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file. See the AUTHORS file for names of contributors.
#ifndef CRC32C_CRC32C_EXTEND_UNITTESTS_H_
#define CRC32C_CRC32C_EXTEND_UNITTESTS_H_
#include <cstddef>
#include <cstdint>
#include <cstring>
#include "gtest/gtest.h"
// Common test cases for all implementations of CRC32C_Extend().
namespace crc32c {
template<typename TestTraits>
class ExtendTest : public testing::Test {};
TYPED_TEST_SUITE_P(ExtendTest);
TYPED_TEST_P(ExtendTest, StandardResults) {
// From rfc3720 section B.4.
uint8_t buf[32];
std::memset(buf, 0, sizeof(buf));
EXPECT_EQ(static_cast<uint32_t>(0x8a9136aa),
TypeParam::Extend(0, buf, sizeof(buf)));
std::memset(buf, 0xff, sizeof(buf));
EXPECT_EQ(static_cast<uint32_t>(0x62a8ab43),
TypeParam::Extend(0, buf, sizeof(buf)));
for (int i = 0; i < 32; ++i)
buf[i] = static_cast<uint8_t>(i);
EXPECT_EQ(static_cast<uint32_t>(0x46dd794e),
TypeParam::Extend(0, buf, sizeof(buf)));
for (int i = 0; i < 32; ++i)
buf[i] = static_cast<uint8_t>(31 - i);
EXPECT_EQ(static_cast<uint32_t>(0x113fdb5c),
TypeParam::Extend(0, buf, sizeof(buf)));
uint8_t data[48] = {
0x01, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x14, 0x00, 0x00, 0x00, 0x00, 0x00, 0x04, 0x00,
0x00, 0x00, 0x00, 0x14, 0x00, 0x00, 0x00, 0x18, 0x28, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
};
EXPECT_EQ(static_cast<uint32_t>(0xd9963a56),
TypeParam::Extend(0, data, sizeof(data)));
}
TYPED_TEST_P(ExtendTest, HelloWorld) {
const uint8_t* hello_space_world =
reinterpret_cast<const uint8_t*>("hello world");
const uint8_t* hello_space = reinterpret_cast<const uint8_t*>("hello ");
const uint8_t* world = reinterpret_cast<const uint8_t*>("world");
EXPECT_EQ(TypeParam::Extend(0, hello_space_world, 11),
TypeParam::Extend(TypeParam::Extend(0, hello_space, 6), world, 5));
}
TYPED_TEST_P(ExtendTest, BufferSlicing) {
uint8_t buffer[48] = {
0x01, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x14, 0x00, 0x00, 0x00, 0x00, 0x00, 0x04, 0x00,
0x00, 0x00, 0x00, 0x14, 0x00, 0x00, 0x00, 0x18, 0x28, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
};
for (size_t i = 0; i < 48; ++i) {
for (size_t j = i + 1; j <= 48; ++j) {
uint32_t crc = 0;
if (i > 0) crc = TypeParam::Extend(crc, buffer, i);
crc = TypeParam::Extend(crc, buffer + i, j - i);
if (j < 48) crc = TypeParam::Extend(crc, buffer + j, 48 - j);
EXPECT_EQ(static_cast<uint32_t>(0xd9963a56), crc);
}
}
}
TYPED_TEST_P(ExtendTest, LargeBufferSlicing) {
uint8_t buffer[2048];
for (size_t i = 0; i < 2048; i++)
buffer[i] = static_cast<uint8_t>(3 * i * i + 7 * i + 11);
for (size_t i = 0; i < 2048; ++i) {
for (size_t j = i + 1; j <= 2048; ++j) {
uint32_t crc = 0;
if (i > 0) crc = TypeParam::Extend(crc, buffer, i);
crc = TypeParam::Extend(crc, buffer + i, j - i);
if (j < 2048) crc = TypeParam::Extend(crc, buffer + j, 2048 - j);
EXPECT_EQ(static_cast<uint32_t>(0x36dcc753), crc);
}
}
}
REGISTER_TYPED_TEST_SUITE_P(ExtendTest,
StandardResults,
HelloWorld,
BufferSlicing,
LargeBufferSlicing);
} // namespace crc32c
#endif // CRC32C_CRC32C_EXTEND_UNITTESTS_H_
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