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/*
* Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include <limits>
#include "testing/gtest/include/gtest/gtest.h"
#include "webrtc/modules/rtp_rtcp/source/byte_io.h"
namespace webrtc {
namespace {
class ByteIoTest : public ::testing::Test {
protected:
ByteIoTest() {}
virtual ~ByteIoTest() {}
enum { kAlignments = sizeof(uint64_t) - 1 };
// Method to create a test value that is not the same when byte reversed.
template <typename T>
T CreateTestValue(bool negative, uint8_t num_bytes) {
T val = 0;
for (uint8_t i = 0; i != num_bytes; ++i) {
val = (val << 8) + (negative ? (0xFF - i) : (i + 1));
}
if (negative && std::numeric_limits<T>::is_signed) {
val |= static_cast<T>(-1) << (8 * num_bytes);
}
return val;
}
// Populate byte buffer with value, in big endian format.
template <typename T>
void PopulateTestData(uint8_t* data, T value, int num_bytes, bool bigendian) {
if (bigendian) {
for (int i = 0; i < num_bytes; ++i) {
data[i] = (value >> ((num_bytes - i - 1) * 8)) & 0xFF;
}
} else {
for (int i = 0; i < num_bytes; ++i) {
data[i] = (value >> (i * 8)) & 0xFF;
}
}
}
// Test reading big endian numbers.
// Template arguments: Type T, read method RM(buffer), B bytes of data.
template <typename T, T (*RM)(const uint8_t*), int B>
void TestRead(bool big_endian) {
// Test both for values that are positive and negative (if signed)
for (int neg = 0; neg < 2; ++neg) {
bool negative = neg > 0;
// Write test value to byte buffer, in big endian format.
T test_value = CreateTestValue<T>(negative, B);
uint8_t bytes[B + kAlignments];
// Make one test for each alignment.
for (int i = 0; i < kAlignments; ++i) {
PopulateTestData(bytes + i, test_value, B, big_endian);
// Check that test value is retrieved from buffer when used read method.
EXPECT_EQ(test_value, RM(bytes + i));
}
}
}
// Test writing big endian numbers.
// Template arguments: Type T, write method WM(buffer, value), B bytes of data
template <typename T, void (*WM)(uint8_t*, T), int B>
void TestWrite(bool big_endian) {
// Test both for values that are positive and negative (if signed).
for (int neg = 0; neg < 2; ++neg) {
bool negative = neg > 0;
// Write test value to byte buffer, in big endian format.
T test_value = CreateTestValue<T>(negative, B);
uint8_t expected_bytes[B + kAlignments];
uint8_t bytes[B + kAlignments];
// Make one test for each alignment.
for (int i = 0; i < kAlignments; ++i) {
PopulateTestData(expected_bytes + i, test_value, B, big_endian);
// Zero initialize buffer and let WM populate it.
memset(bytes, 0, B + kAlignments);
WM(bytes + i, test_value);
// Check that data produced by WM is big endian as expected.
for (int j = 0; j < B; ++j) {
EXPECT_EQ(expected_bytes[i + j], bytes[i + j]);
}
}
}
}
};
TEST_F(ByteIoTest, Test16UBitBigEndian) {
TestRead<uint16_t, ByteReader<uint16_t>::ReadBigEndian,
sizeof(uint16_t)>(true);
TestWrite<uint16_t, ByteWriter<uint16_t>::WriteBigEndian,
sizeof(uint16_t)>(true);
}
TEST_F(ByteIoTest, Test24UBitBigEndian) {
TestRead<uint32_t, ByteReader<uint32_t, 3>::ReadBigEndian, 3>(true);
TestWrite<uint32_t, ByteWriter<uint32_t, 3>::WriteBigEndian, 3>(true);
}
TEST_F(ByteIoTest, Test32UBitBigEndian) {
TestRead<uint32_t, ByteReader<uint32_t>::ReadBigEndian,
sizeof(uint32_t)>(true);
TestWrite<uint32_t, ByteWriter<uint32_t>::WriteBigEndian,
sizeof(uint32_t)>(true);
}
TEST_F(ByteIoTest, Test64UBitBigEndian) {
TestRead<uint64_t, ByteReader<uint64_t>::ReadBigEndian,
sizeof(uint64_t)>(true);
TestWrite<uint64_t, ByteWriter<uint64_t>::WriteBigEndian,
sizeof(uint64_t)>(true);
}
TEST_F(ByteIoTest, Test16SBitBigEndian) {
TestRead<int16_t, ByteReader<int16_t>::ReadBigEndian,
sizeof(int16_t)>(true);
TestWrite<int16_t, ByteWriter<int16_t>::WriteBigEndian,
sizeof(int16_t)>(true);
}
TEST_F(ByteIoTest, Test24SBitBigEndian) {
TestRead<int32_t, ByteReader<int32_t, 3>::ReadBigEndian, 3>(true);
TestWrite<int32_t, ByteWriter<int32_t, 3>::WriteBigEndian, 3>(true);
}
TEST_F(ByteIoTest, Test32SBitBigEndian) {
TestRead<int32_t, ByteReader<int32_t>::ReadBigEndian,
sizeof(int32_t)>(true);
TestWrite<int32_t, ByteWriter<int32_t>::WriteBigEndian,
sizeof(int32_t)>(true);
}
TEST_F(ByteIoTest, Test64SBitBigEndian) {
TestRead<int64_t, ByteReader<int64_t>::ReadBigEndian,
sizeof(int64_t)>(true);
TestWrite<int64_t, ByteWriter<int64_t>::WriteBigEndian,
sizeof(int64_t)>(true);
}
TEST_F(ByteIoTest, Test16UBitLittleEndian) {
TestRead<uint16_t, ByteReader<uint16_t>::ReadLittleEndian,
sizeof(uint16_t)>(false);
TestWrite<uint16_t, ByteWriter<uint16_t>::WriteLittleEndian,
sizeof(uint16_t)>(false);
}
TEST_F(ByteIoTest, Test24UBitLittleEndian) {
TestRead<uint32_t, ByteReader<uint32_t, 3>::ReadLittleEndian, 3>(false);
TestWrite<uint32_t, ByteWriter<uint32_t, 3>::WriteLittleEndian, 3>(false);
}
TEST_F(ByteIoTest, Test32UBitLittleEndian) {
TestRead<uint32_t, ByteReader<uint32_t>::ReadLittleEndian,
sizeof(uint32_t)>(false);
TestWrite<uint32_t, ByteWriter<uint32_t>::WriteLittleEndian,
sizeof(uint32_t)>(false);
}
TEST_F(ByteIoTest, Test64UBitLittleEndian) {
TestRead<uint64_t, ByteReader<uint64_t>::ReadLittleEndian,
sizeof(uint64_t)>(false);
TestWrite<uint64_t, ByteWriter<uint64_t>::WriteLittleEndian,
sizeof(uint64_t)>(false);
}
TEST_F(ByteIoTest, Test16SBitLittleEndian) {
TestRead<int16_t, ByteReader<int16_t>::ReadLittleEndian,
sizeof(int16_t)>(false);
TestWrite<int16_t, ByteWriter<int16_t>::WriteLittleEndian,
sizeof(int16_t)>(false);
}
TEST_F(ByteIoTest, Test24SBitLittleEndian) {
TestRead<int32_t, ByteReader<int32_t, 3>::ReadLittleEndian, 3>(false);
TestWrite<int32_t, ByteWriter<int32_t, 3>::WriteLittleEndian, 3>(false);
}
TEST_F(ByteIoTest, Test32SBitLittleEndian) {
TestRead<int32_t, ByteReader<int32_t>::ReadLittleEndian,
sizeof(int32_t)>(false);
TestWrite<int32_t, ByteWriter<int32_t>::WriteLittleEndian,
sizeof(int32_t)>(false);
}
TEST_F(ByteIoTest, Test64SBitLittleEndian) {
TestRead<int64_t, ByteReader<int64_t>::ReadLittleEndian,
sizeof(int64_t)>(false);
TestWrite<int64_t, ByteWriter<int64_t>::WriteLittleEndian,
sizeof(int64_t)>(false);
}
} // namespace
} // namespace webrtc
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