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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/base/io_buffer.h"
#include <array>
#include "base/containers/span.h"
#include "base/memory/ref_counted.h"
#include "base/numerics/checked_math.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace net {
namespace {
// Compares the data in `io_buffer` to `span`. Tests all const accessors.
void CompareConstIOBufferToSpan(const IOBuffer& io_buffer,
base::span<const uint8_t> span) {
EXPECT_EQ(io_buffer.span(), span);
// For validating the other accessors, it should be sufficient to check size()
// and make sure returned pointers match io_buffer.span().data().
ASSERT_EQ(base::checked_cast<size_t>(io_buffer.size()), span.size());
EXPECT_EQ(reinterpret_cast<const uint8_t*>(io_buffer.data()),
io_buffer.span().data());
EXPECT_EQ(io_buffer.bytes(), io_buffer.span().data());
}
// Compares the data in `io_buffer` to `span`. Tests all accessors.
void CompareIOBufferToSpan(IOBuffer& io_buffer,
base::span<const uint8_t> span) {
CompareConstIOBufferToSpan(io_buffer, span);
// For validating the other accessors, it should be sufficient to check size()
// and make sure returned pointers match io_buffer.span().data().
ASSERT_EQ(base::checked_cast<size_t>(io_buffer.size()), span.size());
EXPECT_EQ(reinterpret_cast<uint8_t*>(io_buffer.data()),
io_buffer.span().data());
EXPECT_EQ(io_buffer.bytes(), io_buffer.span().data());
}
TEST(IOBufferTest, VectorIOBuffer) {
// Include values greater than 0x7F to make sure signed/unsigned is handled
// appropriately.
std::vector<uint8_t> data{0, 0xFF, 1, 0xFE, 2, 0xFD, 3, 0xFC,
4, 0xFB, 5, 0xFA, 6, 0xF9, 7, 0x80};
std::vector<uint8_t> original_data = data;
auto buffer = base::MakeRefCounted<VectorIOBuffer>(data);
CompareIOBufferToSpan(*buffer, data);
// Check that the buffer has its own copy of the data.
EXPECT_NE(buffer->bytes(), data.data());
// Test writing to the buffer.
buffer->span()[0] = 9;
buffer->span()[data.size() - 1] = 0x90;
std::vector<uint8_t> data2{9, 0xFF, 1, 0xFE, 2, 0xFD, 3, 0xFC,
4, 0xFB, 5, 0xFA, 6, 0xF9, 7, 0x90};
CompareIOBufferToSpan(*buffer, data2);
// The original buffer should not have been modified.
EXPECT_EQ(original_data, data);
EXPECT_NE(buffer->span(), data);
}
TEST(IOBufferTest, StringIOBuffer) {
// Include values greater than 0x7F to make sure signed/unsigned is handled
// appropriately.
auto data = std::array{'\0', 'a', 'b', 'c', '\xFF', '\xF0'};
auto buffer = base::MakeRefCounted<StringIOBuffer>(
std::string(data.begin(), data.end()));
CompareIOBufferToSpan(*buffer, base::as_bytes(base::span(data)));
// Check that the buffer has its own copy of the data.
EXPECT_NE(buffer->data(), data.data());
}
TEST(IOBufferTest, DrainableIOBuffer_DidConsume) {
// Include values greater than 0x7F to make sure signed/unsigned is handled
// appropriately.
std::vector<uint8_t> data{0, 0xFF, 1, 0xFE, 2, 0xFD, 3, 0xFC,
4, 0xFB, 5, 0xFA, 6, 0xF9, 7, 0x80};
auto data_buffer = base::MakeRefCounted<VectorIOBuffer>(data);
// Test both the case the entire nested IOBuffer is included in the
// DrainableIOBuffer, and the case where the last value is excluded.
for (size_t size : {data.size(), data.size() - 1}) {
auto buffer = base::MakeRefCounted<DrainableIOBuffer>(data_buffer, size);
auto span = base::span<uint8_t>(data).subspan(0u, size);
CompareIOBufferToSpan(*buffer, span);
EXPECT_EQ(buffer->BytesConsumed(), 0);
EXPECT_EQ(buffer->BytesRemaining(), base::checked_cast<int>(size));
buffer->DidConsume(1);
CompareIOBufferToSpan(*buffer, span.subspan(1u));
EXPECT_EQ(buffer->BytesConsumed(), 1);
EXPECT_EQ(buffer->BytesRemaining(), base::checked_cast<int>(size - 1));
buffer->DidConsume(3);
CompareIOBufferToSpan(*buffer, span.subspan(4u));
EXPECT_EQ(buffer->BytesConsumed(), 4);
EXPECT_EQ(buffer->BytesRemaining(), base::checked_cast<int>(size - 4));
buffer->DidConsume(buffer->size() - 1);
CompareIOBufferToSpan(*buffer, span.subspan(size - 1));
EXPECT_EQ(buffer->BytesConsumed(), base::checked_cast<int>(size - 1));
EXPECT_EQ(buffer->BytesRemaining(), 1);
buffer->DidConsume(1);
CompareIOBufferToSpan(*buffer, base::span<uint8_t>());
EXPECT_EQ(buffer->BytesConsumed(), base::checked_cast<int>(size));
EXPECT_EQ(buffer->BytesRemaining(), 0);
}
}
TEST(IOBufferTest, DrainableIOBuffer_SetOffset) {
// Include values greater than 0x7F to make sure signed/unsigned is handled
// appropriately.
std::vector<uint8_t> data{0, 0xFF, 1, 0xFE, 2, 0xFD, 3, 0xFC,
4, 0xFB, 5, 0xFA, 6, 0xF9, 7, 0x80};
auto data_buffer = base::MakeRefCounted<VectorIOBuffer>(data);
// Test both the case the entire nested IOBuffer is included in the
// DrainableIOBuffer, and the case where the last value is excluded.
for (size_t size : {data.size(), data.size() - 1}) {
auto buffer = base::MakeRefCounted<DrainableIOBuffer>(data_buffer, size);
auto span = base::span<uint8_t>(data).subspan(0u, size);
CompareIOBufferToSpan(*buffer, span);
EXPECT_EQ(buffer->BytesConsumed(), 0);
EXPECT_EQ(buffer->BytesRemaining(), base::checked_cast<int>(size));
buffer->SetOffset(size - 1);
CompareIOBufferToSpan(*buffer, span.subspan(size - 1));
EXPECT_EQ(buffer->BytesConsumed(), base::checked_cast<int>(size - 1));
EXPECT_EQ(buffer->BytesRemaining(), 1);
buffer->SetOffset(1);
CompareIOBufferToSpan(*buffer, span.subspan(1u));
EXPECT_EQ(buffer->BytesConsumed(), 1);
EXPECT_EQ(buffer->BytesRemaining(), base::checked_cast<int>(size - 1));
buffer->SetOffset(size);
CompareIOBufferToSpan(*buffer, base::span<uint8_t>());
EXPECT_EQ(buffer->BytesConsumed(), base::checked_cast<int>(size));
EXPECT_EQ(buffer->BytesRemaining(), 0);
buffer->SetOffset(0);
CompareIOBufferToSpan(*buffer, span);
EXPECT_EQ(buffer->BytesConsumed(), 0);
EXPECT_EQ(buffer->BytesRemaining(), base::checked_cast<int>(size));
buffer->SetOffset(4);
CompareIOBufferToSpan(*buffer, span.subspan(4u));
EXPECT_EQ(buffer->BytesConsumed(), 4);
EXPECT_EQ(buffer->BytesRemaining(), base::checked_cast<int>(size - 4));
}
}
TEST(IOBufferTest, DrainableIOBuffer_DidConsumerAndSetOffset) {
// Include values greater than 0x7F to make sure signed/unsigned is handled
// appropriately.
std::vector<uint8_t> data{0, 0xFF, 1, 0xFE, 2, 0xFD, 3, 0xFC,
4, 0xFB, 5, 0xFA, 6, 0xF9, 7, 0x80};
auto data_buffer = base::MakeRefCounted<VectorIOBuffer>(data);
// Test both the case the entire nested IOBuffer is included in the
// DrainableIOBuffer, and the case where the last value is excluded.
for (size_t size : {data.size(), data.size() - 1}) {
auto buffer = base::MakeRefCounted<DrainableIOBuffer>(data_buffer, size);
auto span = base::span<uint8_t>(data).subspan(0u, size);
CompareIOBufferToSpan(*buffer, span);
EXPECT_EQ(buffer->BytesConsumed(), 0);
EXPECT_EQ(buffer->BytesRemaining(), base::checked_cast<int>(size));
buffer->DidConsume(size);
CompareIOBufferToSpan(*buffer, base::span<uint8_t>());
EXPECT_EQ(buffer->BytesConsumed(), base::checked_cast<int>(size));
EXPECT_EQ(buffer->BytesRemaining(), 0);
buffer->SetOffset(1);
CompareIOBufferToSpan(*buffer, span.subspan(1u));
EXPECT_EQ(buffer->BytesConsumed(), 1);
EXPECT_EQ(buffer->BytesRemaining(), base::checked_cast<int>(size - 1));
buffer->DidConsume(3);
CompareIOBufferToSpan(*buffer, span.subspan(4u));
EXPECT_EQ(buffer->BytesConsumed(), 4);
EXPECT_EQ(buffer->BytesRemaining(), base::checked_cast<int>(size - 4));
buffer->SetOffset(0);
CompareIOBufferToSpan(*buffer, span);
EXPECT_EQ(buffer->BytesConsumed(), 0);
EXPECT_EQ(buffer->BytesRemaining(), base::checked_cast<int>(size));
buffer->DidConsume(4);
CompareIOBufferToSpan(*buffer, span.subspan(4u));
EXPECT_EQ(buffer->BytesConsumed(), 4);
EXPECT_EQ(buffer->BytesRemaining(), base::checked_cast<int>(size - 4));
}
}
TEST(IOBufferTest, GrowableIOBuffer_SpanBeforeOffset) {
auto buffer = base::MakeRefCounted<GrowableIOBuffer>();
buffer->SetCapacity(100);
EXPECT_EQ(0u, buffer->span_before_offset().size());
buffer->set_offset(10);
EXPECT_EQ(10u, buffer->span_before_offset().size());
EXPECT_EQ(buffer->everything().data(), buffer->span_before_offset().data());
buffer->set_offset(100);
EXPECT_EQ(100u, buffer->span_before_offset().size());
EXPECT_EQ(buffer->everything().data(), buffer->span_before_offset().data());
}
TEST(IOBufferTest, WrappedIOBuffer) {
// Include values greater than 0x7F to make sure signed/unsigned is handled
// appropriately.
std::vector<uint8_t> data{0, 0xFF, 1, 0xFE, 2, 0xFD, 3, 0xFC,
4, 0xFB, 5, 0xFA, 6, 0xF9, 7, 0x80};
auto buffer = base::MakeRefCounted<WrappedIOBuffer>(data);
CompareIOBufferToSpan(*buffer, data);
// Check that the buffer does not have its own copy of the data.
EXPECT_EQ(buffer->bytes(), data.data());
}
} // anonymous namespace
} // namespace net
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