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/*
* Copyright 2016 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 "rtc_base/copy_on_write_buffer.h"
#include <cstdint>
#include "test/gtest.h"
namespace rtc {
namespace {
// clang-format off
const uint8_t kTestData[] = {0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7,
0x8, 0x9, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf};
// clang-format on
} // namespace
void EnsureBuffersShareData(const CopyOnWriteBuffer& buf1,
const CopyOnWriteBuffer& buf2) {
// Data is shared between buffers.
EXPECT_EQ(buf1.size(), buf2.size());
EXPECT_EQ(buf1.capacity(), buf2.capacity());
const uint8_t* data1 = buf1.data();
const uint8_t* data2 = buf2.data();
EXPECT_EQ(data1, data2);
EXPECT_EQ(buf1, buf2);
}
void EnsureBuffersDontShareData(const CopyOnWriteBuffer& buf1,
const CopyOnWriteBuffer& buf2) {
// Data is not shared between buffers.
const uint8_t* data1 = buf1.cdata();
const uint8_t* data2 = buf2.cdata();
EXPECT_NE(data1, data2);
}
TEST(CopyOnWriteBufferTest, TestCreateEmptyData) {
CopyOnWriteBuffer buf(static_cast<const uint8_t*>(nullptr), 0);
EXPECT_EQ(buf.size(), 0u);
EXPECT_EQ(buf.capacity(), 0u);
EXPECT_EQ(buf.data(), nullptr);
}
TEST(CopyOnWriteBufferTest, TestMoveConstruct) {
EXPECT_TRUE(std::is_nothrow_move_constructible_v<CopyOnWriteBuffer>);
CopyOnWriteBuffer buf1(kTestData, 3, 10);
size_t buf1_size = buf1.size();
size_t buf1_capacity = buf1.capacity();
const uint8_t* buf1_data = buf1.cdata();
CopyOnWriteBuffer buf2(std::move(buf1));
EXPECT_EQ(buf1.size(), 0u);
EXPECT_EQ(buf1.capacity(), 0u);
EXPECT_EQ(buf1.data(), nullptr);
EXPECT_EQ(buf2.size(), buf1_size);
EXPECT_EQ(buf2.capacity(), buf1_capacity);
EXPECT_EQ(buf2.data(), buf1_data);
}
TEST(CopyOnWriteBufferTest, TestMoveAssign) {
CopyOnWriteBuffer buf1(kTestData, 3, 10);
size_t buf1_size = buf1.size();
size_t buf1_capacity = buf1.capacity();
const uint8_t* buf1_data = buf1.cdata();
CopyOnWriteBuffer buf2;
buf2 = std::move(buf1);
EXPECT_EQ(buf1.size(), 0u);
EXPECT_EQ(buf1.capacity(), 0u);
EXPECT_EQ(buf1.data(), nullptr);
EXPECT_EQ(buf2.size(), buf1_size);
EXPECT_EQ(buf2.capacity(), buf1_capacity);
EXPECT_EQ(buf2.data(), buf1_data);
}
TEST(CopyOnWriteBufferTest, TestSwap) {
CopyOnWriteBuffer buf1(kTestData, 3, 10);
size_t buf1_size = buf1.size();
size_t buf1_capacity = buf1.capacity();
const uint8_t* buf1_data = buf1.cdata();
CopyOnWriteBuffer buf2(kTestData, 6, 20);
size_t buf2_size = buf2.size();
size_t buf2_capacity = buf2.capacity();
const uint8_t* buf2_data = buf2.cdata();
std::swap(buf1, buf2);
EXPECT_EQ(buf1.size(), buf2_size);
EXPECT_EQ(buf1.capacity(), buf2_capacity);
EXPECT_EQ(buf1.data(), buf2_data);
EXPECT_EQ(buf2.size(), buf1_size);
EXPECT_EQ(buf2.capacity(), buf1_capacity);
EXPECT_EQ(buf2.data(), buf1_data);
}
TEST(CopyOnWriteBufferTest, TestAppendData) {
CopyOnWriteBuffer buf1(kTestData, 3, 10);
CopyOnWriteBuffer buf2(buf1);
EnsureBuffersShareData(buf1, buf2);
// AppendData copies the underlying buffer.
buf2.AppendData("foo");
EXPECT_EQ(buf2.size(), buf1.size() + 4); // "foo" + trailing 0x00
EXPECT_EQ(buf2.capacity(), buf1.capacity());
EXPECT_NE(buf2.data(), buf1.data());
EXPECT_EQ(buf1, CopyOnWriteBuffer(kTestData, 3));
const int8_t exp[] = {0x0, 0x1, 0x2, 'f', 'o', 'o', 0x0};
EXPECT_EQ(buf2, CopyOnWriteBuffer(exp));
}
TEST(CopyOnWriteBufferTest, SetEmptyData) {
CopyOnWriteBuffer buf(10);
buf.SetData<uint8_t>(nullptr, 0);
EXPECT_EQ(0u, buf.size());
}
TEST(CopyOnWriteBufferTest, SetDataNoMoreThanCapacityDoesntCauseReallocation) {
CopyOnWriteBuffer buf1(3, 10);
const uint8_t* const original_allocation = buf1.cdata();
buf1.SetData(kTestData, 10);
EXPECT_EQ(original_allocation, buf1.cdata());
EXPECT_EQ(buf1, CopyOnWriteBuffer(kTestData, 10));
}
TEST(CopyOnWriteBufferTest, SetDataMakeReferenceCopy) {
CopyOnWriteBuffer buf1(kTestData, 3, 10);
CopyOnWriteBuffer buf2;
buf2.SetData(buf1);
EnsureBuffersShareData(buf1, buf2);
}
TEST(CopyOnWriteBufferTest, SetDataOnSharedKeepsOriginal) {
const uint8_t data[] = "foo";
CopyOnWriteBuffer buf1(kTestData, 3, 10);
const uint8_t* const original_allocation = buf1.cdata();
CopyOnWriteBuffer buf2(buf1);
buf2.SetData(data);
EnsureBuffersDontShareData(buf1, buf2);
EXPECT_EQ(original_allocation, buf1.cdata());
EXPECT_EQ(buf1, CopyOnWriteBuffer(kTestData, 3));
EXPECT_EQ(buf2, CopyOnWriteBuffer(data));
}
TEST(CopyOnWriteBufferTest, SetDataOnSharedKeepsCapacity) {
CopyOnWriteBuffer buf1(kTestData, 3, 10);
CopyOnWriteBuffer buf2(buf1);
EnsureBuffersShareData(buf1, buf2);
buf2.SetData(kTestData, 2);
EnsureBuffersDontShareData(buf1, buf2);
EXPECT_EQ(2u, buf2.size());
EXPECT_EQ(10u, buf2.capacity());
}
TEST(CopyOnWriteBufferTest, TestEnsureCapacity) {
CopyOnWriteBuffer buf1(kTestData, 3, 10);
CopyOnWriteBuffer buf2(buf1);
// Smaller than existing capacity -> no change and still same contents.
buf2.EnsureCapacity(8);
EnsureBuffersShareData(buf1, buf2);
EXPECT_EQ(buf1.size(), 3u);
EXPECT_EQ(buf1.capacity(), 10u);
EXPECT_EQ(buf2.size(), 3u);
EXPECT_EQ(buf2.capacity(), 10u);
// Lager than existing capacity -> data is cloned.
buf2.EnsureCapacity(16);
EnsureBuffersDontShareData(buf1, buf2);
EXPECT_EQ(buf1.size(), 3u);
EXPECT_EQ(buf1.capacity(), 10u);
EXPECT_EQ(buf2.size(), 3u);
EXPECT_EQ(buf2.capacity(), 16u);
// The size and contents are still the same.
EXPECT_EQ(buf1, buf2);
}
TEST(CopyOnWriteBufferTest, SetSizeDoesntChangeOriginal) {
CopyOnWriteBuffer buf1(kTestData, 3, 10);
const uint8_t* const original_allocation = buf1.cdata();
CopyOnWriteBuffer buf2(buf1);
buf2.SetSize(16);
EnsureBuffersDontShareData(buf1, buf2);
EXPECT_EQ(original_allocation, buf1.cdata());
EXPECT_EQ(3u, buf1.size());
EXPECT_EQ(10u, buf1.capacity());
}
TEST(CopyOnWriteBufferTest, SetSizeCloneContent) {
CopyOnWriteBuffer buf1(kTestData, 3, 10);
CopyOnWriteBuffer buf2(buf1);
buf2.SetSize(16);
EXPECT_EQ(buf2.size(), 16u);
EXPECT_EQ(0, memcmp(buf2.data(), kTestData, 3));
}
TEST(CopyOnWriteBufferTest, SetSizeMayIncreaseCapacity) {
CopyOnWriteBuffer buf(kTestData, 3, 10);
buf.SetSize(16);
EXPECT_EQ(16u, buf.size());
EXPECT_EQ(16u, buf.capacity());
}
TEST(CopyOnWriteBufferTest, SetSizeDoesntDecreaseCapacity) {
CopyOnWriteBuffer buf1(kTestData, 5, 10);
CopyOnWriteBuffer buf2(buf1);
buf2.SetSize(2);
EXPECT_EQ(2u, buf2.size());
EXPECT_EQ(10u, buf2.capacity());
}
TEST(CopyOnWriteBufferTest, ClearDoesntChangeOriginal) {
CopyOnWriteBuffer buf1(kTestData, 3, 10);
const uint8_t* const original_allocation = buf1.cdata();
CopyOnWriteBuffer buf2(buf1);
buf2.Clear();
EnsureBuffersDontShareData(buf1, buf2);
EXPECT_EQ(3u, buf1.size());
EXPECT_EQ(10u, buf1.capacity());
EXPECT_EQ(original_allocation, buf1.cdata());
EXPECT_EQ(0u, buf2.size());
}
TEST(CopyOnWriteBufferTest, ClearDoesntChangeCapacity) {
CopyOnWriteBuffer buf1(kTestData, 3, 10);
CopyOnWriteBuffer buf2(buf1);
buf2.Clear();
EXPECT_EQ(0u, buf2.size());
EXPECT_EQ(10u, buf2.capacity());
}
TEST(CopyOnWriteBufferTest, DataAccessorDoesntCloneData) {
CopyOnWriteBuffer buf1(kTestData, 3, 10);
CopyOnWriteBuffer buf2(buf1);
EXPECT_EQ(buf1.data(), buf2.data());
}
TEST(CopyOnWriteBufferTest, MutableDataClonesDataWhenShared) {
CopyOnWriteBuffer buf1(kTestData, 3, 10);
CopyOnWriteBuffer buf2(buf1);
const uint8_t* cdata = buf1.data();
uint8_t* data1 = buf1.MutableData();
uint8_t* data2 = buf2.MutableData();
// buf1 was cloned above.
EXPECT_NE(data1, cdata);
// Therefore buf2 was no longer sharing data and was not cloned.
EXPECT_EQ(data2, cdata);
}
TEST(CopyOnWriteBufferTest, SeveralReads) {
CopyOnWriteBuffer buf1(kTestData, 3, 10);
CopyOnWriteBuffer buf2(buf1);
EnsureBuffersShareData(buf1, buf2);
for (size_t i = 0; i != 3u; ++i) {
EXPECT_EQ(buf1[i], kTestData[i]);
}
EnsureBuffersShareData(buf1, buf2);
}
TEST(CopyOnWriteBufferTest, SeveralWrites) {
CopyOnWriteBuffer buf1(kTestData, 3, 10);
CopyOnWriteBuffer buf2(buf1);
EnsureBuffersShareData(buf1, buf2);
for (size_t i = 0; i != 3u; ++i) {
buf1.MutableData()[i] = kTestData[i] + 1;
}
EXPECT_EQ(buf1.size(), 3u);
EXPECT_EQ(buf1.capacity(), 10u);
EXPECT_EQ(buf2.size(), 3u);
EXPECT_EQ(buf2.capacity(), 10u);
EXPECT_EQ(0, memcmp(buf2.cdata(), kTestData, 3));
}
TEST(CopyOnWriteBufferTest, CreateSlice) {
CopyOnWriteBuffer buf(kTestData, 10, 10);
CopyOnWriteBuffer slice = buf.Slice(3, 4);
EXPECT_EQ(slice.size(), 4u);
EXPECT_EQ(0, memcmp(buf.cdata() + 3, slice.cdata(), 4));
}
TEST(CopyOnWriteBufferTest, NoCopyDataOnSlice) {
CopyOnWriteBuffer buf(kTestData, 10, 10);
CopyOnWriteBuffer slice = buf.Slice(3, 4);
EXPECT_EQ(buf.cdata() + 3, slice.cdata());
}
TEST(CopyOnWriteBufferTest, WritingCopiesData) {
CopyOnWriteBuffer buf(kTestData, 10, 10);
CopyOnWriteBuffer slice = buf.Slice(3, 4);
slice.MutableData()[0] = 0xaa;
EXPECT_NE(buf.cdata() + 3, slice.cdata());
EXPECT_EQ(0, memcmp(buf.cdata(), kTestData, 10));
}
TEST(CopyOnWriteBufferTest, WritingToBufferDoesntAffectsSlice) {
CopyOnWriteBuffer buf(kTestData, 10, 10);
CopyOnWriteBuffer slice = buf.Slice(3, 4);
buf.MutableData()[0] = 0xaa;
EXPECT_NE(buf.cdata() + 3, slice.cdata());
EXPECT_EQ(0, memcmp(slice.cdata(), kTestData + 3, 4));
}
TEST(CopyOnWriteBufferTest, SliceOfASlice) {
CopyOnWriteBuffer buf(kTestData, 10, 10);
CopyOnWriteBuffer slice = buf.Slice(3, 7);
CopyOnWriteBuffer slice2 = slice.Slice(2, 3);
EXPECT_EQ(slice2.size(), 3u);
EXPECT_EQ(slice.cdata() + 2, slice2.cdata());
EXPECT_EQ(buf.cdata() + 5, slice2.cdata());
}
TEST(CopyOnWriteBufferTest, SlicesAreIndependent) {
CopyOnWriteBuffer buf(kTestData, 10, 10);
CopyOnWriteBuffer slice = buf.Slice(3, 7);
CopyOnWriteBuffer slice2 = buf.Slice(3, 7);
slice2.MutableData()[0] = 0xaa;
EXPECT_EQ(buf.cdata() + 3, slice.cdata());
}
TEST(CopyOnWriteBufferTest, AcceptsVectorLikeTypes) {
std::vector<uint8_t> a = {1, 2};
std::vector<int8_t> b = {3, 4};
rtc::ArrayView<uint8_t> c(a);
rtc::ArrayView<const int8_t> d(b);
CopyOnWriteBuffer a_buf(a);
CopyOnWriteBuffer b_buf(b);
CopyOnWriteBuffer c_buf(c);
CopyOnWriteBuffer d_buf(d);
CopyOnWriteBuffer all;
all.AppendData(a);
all.AppendData(b);
all.AppendData(c);
all.AppendData(d);
EXPECT_EQ(all.size(), 8U);
}
} // namespace rtc