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// Copyright 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "platform/impl/tls_write_buffer.h"
#include <algorithm>
#include "gmock/gmock.h"
#include "gtest/gtest.h"
namespace openscreen {
namespace {
TEST(TlsWriteBufferTest, CheckBasicFunctionality) {
TlsWriteBuffer buffer;
constexpr size_t write_size = TlsWriteBuffer::kBufferSizeBytes / 2;
uint8_t write_buffer[write_size];
std::fill_n(write_buffer, write_size, uint8_t{1});
EXPECT_TRUE(buffer.Push(write_buffer, write_size));
absl::Span<const uint8_t> readable_data = buffer.GetReadableRegion();
ASSERT_EQ(readable_data.size(), write_size);
for (size_t i = 0; i < readable_data.size(); i++) {
EXPECT_EQ(readable_data[i], 1);
}
buffer.Consume(write_size / 2);
readable_data = buffer.GetReadableRegion();
ASSERT_EQ(readable_data.size(), write_size / 2);
for (size_t i = 0; i < readable_data.size(); i++) {
EXPECT_EQ(readable_data[i], 1);
}
buffer.Consume(write_size / 2);
readable_data = buffer.GetReadableRegion();
ASSERT_EQ(readable_data.size(), size_t{0});
// Test that the entire buffer can be used.
EXPECT_TRUE(buffer.Push(write_buffer, write_size));
EXPECT_TRUE(buffer.Push(write_buffer, write_size));
// The buffer should be 100% full at this point. Confirm that no more can be
// written.
EXPECT_FALSE(buffer.Push(write_buffer, write_size));
EXPECT_FALSE(buffer.Push(write_buffer, 1));
}
TEST(TlsWriteBufferTest, TestWrapAround) {
TlsWriteBuffer buffer;
constexpr size_t buffer_size = TlsWriteBuffer::kBufferSizeBytes;
uint8_t write_buffer[buffer_size];
std::fill_n(write_buffer, buffer_size, uint8_t{1});
constexpr size_t partial_buffer_size = buffer_size * 3 / 4;
EXPECT_TRUE(buffer.Push(write_buffer, partial_buffer_size));
// Buffer contents should now be: |111111111111····|
auto region = buffer.GetReadableRegion();
auto* const buffer_begin = region.data();
ASSERT_TRUE(buffer_begin);
EXPECT_EQ(region.size(), partial_buffer_size);
EXPECT_TRUE(std::all_of(region.begin(), region.end(),
[](uint8_t byte) { return byte == 1; }));
buffer.Consume(buffer_size / 2);
// Buffer contents should now be: |········1111····|
region = buffer.GetReadableRegion();
EXPECT_EQ(region.data(), buffer_begin + buffer_size / 2);
EXPECT_EQ(region.size(), buffer_size / 4);
EXPECT_TRUE(std::all_of(region.begin(), region.end(),
[](uint8_t byte) { return byte == 1; }));
std::fill_n(write_buffer, buffer_size, uint8_t{2});
EXPECT_TRUE(buffer.Push(write_buffer, buffer_size / 2));
// Buffer contents should now be: |2222····11112222|
// Readable region should just be the end part.
region = buffer.GetReadableRegion();
EXPECT_EQ(region.data(), buffer_begin + buffer_size / 2);
EXPECT_EQ(region.size(), buffer_size / 2);
EXPECT_TRUE(std::all_of(region.begin(), region.begin() + buffer_size / 4,
[](uint8_t byte) { return byte == 1; }));
EXPECT_TRUE(std::all_of(region.begin() + buffer_size / 4, region.end(),
[](uint8_t byte) { return byte == 2; }));
buffer.Consume(buffer_size / 2);
// Buffer contents should now be: |2222············|
region = buffer.GetReadableRegion();
EXPECT_EQ(region.data(), buffer_begin);
EXPECT_EQ(region.size(), buffer_size / 4);
EXPECT_TRUE(std::all_of(region.begin(), region.end(),
[](uint8_t byte) { return byte == 2; }));
std::fill_n(write_buffer, buffer_size, uint8_t{3});
// The following Push() fails (not enough room).
EXPECT_FALSE(buffer.Push(write_buffer, buffer_size));
// Buffer contents should still be: |2222············|
EXPECT_TRUE(buffer.Push(write_buffer, buffer_size * 3 / 4));
// Buffer contents should now be: |2222333333333333|
EXPECT_FALSE(buffer.Push(write_buffer, buffer_size)); // Not enough room.
EXPECT_FALSE(buffer.Push(write_buffer, 1)); // Not enough room.
region = buffer.GetReadableRegion();
EXPECT_EQ(region.data(), buffer_begin);
EXPECT_EQ(region.size(), buffer_size);
EXPECT_TRUE(std::all_of(region.begin(), region.begin() + buffer_size / 4,
[](uint8_t byte) { return byte == 2; }));
EXPECT_TRUE(std::all_of(region.begin() + buffer_size / 4, region.end(),
[](uint8_t byte) { return byte == 3; }));
buffer.Consume(buffer_size);
// Buffer contents should now be: |················|
EXPECT_TRUE(buffer.GetReadableRegion().empty());
}
} // namespace
} // namespace openscreen
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