/*
* Copyright (C) 2016 The Android Open Source Project
*
* Licensed 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 <shared/nano_endian.h>
#include <cstdint>
#include <cstring>
#include <gtest/gtest.h>
#include <shared/array_length.h>
template<size_t kByteCount>
static void swapByteTest() {
uint8_t bytes[] = {
0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 0x10 };
static constexpr uint8_t postSwap[] = {
0x10, 0x0F, 0x0E, 0x0D, 0x0C, 0x0B, 0x0A, 0x09,
0x08, 0x07, 0x06, 0x05, 0x04, 0x03, 0x02, 0x01 };
#ifdef __clang__
// This static_assert crashes g++, but it's legit and works in clang.
static_assert(arrayLength(bytes) == arrayLength(postSwap),
"Mismatched arrays");
#endif
static_assert((kByteCount > 0) && (kByteCount <= arrayLength(bytes)),
"Invalid test");
constexpr const uint8_t *kExpected =
postSwap + (arrayLength(postSwap) - kByteCount);
nanoapp_testing::swapBytes(bytes, kByteCount);
EXPECT_EQ(0, ::memcmp(bytes, kExpected, kByteCount));
if (arrayLength(bytes) < kByteCount) {
// Confirm that we didn't modify out of bounds.
EXPECT_EQ(kByteCount + 1, bytes[kByteCount]);
}
}
TEST(EndianTest, SwapBytes1) {
swapByteTest<1>();
}
TEST(EndianTest, SwapBytes2) {
swapByteTest<2>();
}
TEST(EndianTest, SwapBytes4) {
swapByteTest<4>();
}
TEST(EndianTest, SwapBytes8) {
swapByteTest<8>();
}
TEST(EndianTest, SwapBytes16) {
swapByteTest<16>();
}
// These tests should work regardless of which endian platform this
// test happens to be built and running on.
static constexpr uint32_t kValue = UINT32_C(0x04030201);
static constexpr uint8_t kLittleEndianRepresentation[4] = {
0x01, 0x02, 0x03, 0x04 };
TEST(EndianTest, LittleEndianToHost) {
uint32_t value;
::memcpy(&value, kLittleEndianRepresentation, sizeof(value));
value = nanoapp_testing::littleEndianToHost(value);
EXPECT_EQ(kValue, value);
}
TEST(EndianTest, HostToLittleEndian) {
uint32_t value = kValue;
value = nanoapp_testing::hostToLittleEndian(value);
const uint8_t *bytes = reinterpret_cast<uint8_t*>(&value);
EXPECT_EQ(0, ::memcmp(kLittleEndianRepresentation, bytes,
sizeof(kLittleEndianRepresentation)));
}