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