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// Copyright 2016 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 "base/memory/ptr_util.h"
#include "base/sys_byteorder.h"
#include "blimp/net/common.h"
#include "blimp/net/compressed_packet_reader.h"
#include "blimp/net/compressed_packet_writer.h"
#include "blimp/net/test_common.h"
#include "net/base/test_completion_callback.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"
using testing::_;
using testing::DoAll;
using testing::InvokeArgument;
using testing::SaveArg;
namespace blimp {
namespace {
// Calls the CompletionCallback (indicated by the 0-based index cb_idx)
// with the value |result|.
ACTION_TEMPLATE(InvokeCompletionCallback,
HAS_1_TEMPLATE_PARAMS(int, cb_idx),
AND_1_VALUE_PARAMS(result)) {
testing::get<cb_idx>(args).Run(result);
}
// Copies a DrainableIOBuffer to a GrowableIOBuffer.
// |dest_buf_idx|: The 0-based index of a GrowableIOBuffer.
// |src_buf|: A DrainableIOBuffer.
ACTION_TEMPLATE(CopyBuffer,
HAS_1_TEMPLATE_PARAMS(int, dest_buf_idx),
AND_1_VALUE_PARAMS(src_buf)) {
const auto& dest_buf = testing::get<dest_buf_idx>(args);
ASSERT_TRUE(dest_buf);
ASSERT_TRUE(src_buf);
ASSERT_EQ(0, dest_buf->offset());
src_buf->SetOffset(0);
dest_buf->SetCapacity(src_buf->BytesRemaining());
memcpy(dest_buf->data(), src_buf->data(), src_buf->BytesRemaining());
}
class CompressedPacketTest : public testing::Test {
public:
CompressedPacketTest()
: mock_reader_(new MockPacketReader),
mock_writer_(new MockPacketWriter),
compressed_reader_(
new CompressedPacketReader(base::WrapUnique(mock_reader_))),
compressed_writer_(
new CompressedPacketWriter(base::WrapUnique(mock_writer_))) {}
~CompressedPacketTest() override {}
protected:
// Returns the compressed result of |content|.
std::string Compress(const std::string& content) {
scoped_refptr<net::StringIOBuffer> content_str_buf(
new net::StringIOBuffer(content));
scoped_refptr<net::DrainableIOBuffer> content_buf(
new net::DrainableIOBuffer(content_str_buf.get(),
content_str_buf->size()));
scoped_refptr<net::DrainableIOBuffer> compressed_buf;
EXPECT_CALL(*mock_writer_, WritePacket(_, _))
.WillOnce(DoAll(SaveArg<0>(&compressed_buf),
InvokeCompletionCallback<1>(net::OK)));
net::TestCompletionCallback completion_cb_1;
compressed_writer_->WritePacket(content_buf, completion_cb_1.callback());
EXPECT_EQ(net::OK, completion_cb_1.WaitForResult());
return std::string(compressed_buf->data(),
compressed_buf->BytesRemaining());
}
// Returns the decompressed result of |compressed|.
std::string Decompress(const std::string& compressed) {
scoped_refptr<net::StringIOBuffer> compressed_str_buf(
new net::StringIOBuffer(compressed));
scoped_refptr<net::DrainableIOBuffer> compressed_buf(
new net::DrainableIOBuffer(compressed_str_buf.get(),
compressed_str_buf->size()));
scoped_refptr<net::GrowableIOBuffer> decompressed_buf(
new net::GrowableIOBuffer);
EXPECT_CALL(*mock_reader_, ReadPacket(_, _))
.WillOnce(DoAll(
CopyBuffer<0>(compressed_buf),
InvokeCompletionCallback<1>(compressed_buf->BytesRemaining())));
net::TestCompletionCallback completion_cb_2;
compressed_reader_->ReadPacket(decompressed_buf,
completion_cb_2.callback());
int size = completion_cb_2.WaitForResult();
return std::string(decompressed_buf->data(), size);
}
bool CheckRoundTrip(const std::string& content) {
return Decompress(Compress(content)) == content;
}
MockPacketReader* mock_reader_;
MockPacketWriter* mock_writer_;
std::unique_ptr<CompressedPacketReader> compressed_reader_;
std::unique_ptr<CompressedPacketWriter> compressed_writer_;
testing::InSequence s;
};
TEST_F(CompressedPacketTest, Empty) {
EXPECT_TRUE(CheckRoundTrip("1234"));
EXPECT_TRUE(CheckRoundTrip(""));
EXPECT_TRUE(CheckRoundTrip("1234"));
}
TEST_F(CompressedPacketTest, Simple) {
std::string source = "AAAAAAAAAAAAAAAAAAAAAAAAA";
std::string compressed = Compress(source);
std::string decompressed = Decompress(compressed);
EXPECT_GT(source.size(), compressed.size());
EXPECT_EQ(source, decompressed);
}
TEST_F(CompressedPacketTest, DisjointSequences) {
EXPECT_TRUE(CheckRoundTrip("1234"));
EXPECT_TRUE(CheckRoundTrip("5678"));
EXPECT_TRUE(CheckRoundTrip("ABCD"));
}
TEST_F(CompressedPacketTest, AdditiveSequences) {
EXPECT_TRUE(CheckRoundTrip("12"));
EXPECT_TRUE(CheckRoundTrip("123"));
EXPECT_TRUE(CheckRoundTrip("1234"));
EXPECT_TRUE(CheckRoundTrip("12345"));
EXPECT_TRUE(CheckRoundTrip("123456"));
}
TEST_F(CompressedPacketTest, ReversedSequences) {
EXPECT_TRUE(CheckRoundTrip("123456"));
EXPECT_TRUE(CheckRoundTrip("12345"));
EXPECT_TRUE(CheckRoundTrip("1234"));
EXPECT_TRUE(CheckRoundTrip("123"));
EXPECT_TRUE(CheckRoundTrip("12"));
}
TEST_F(CompressedPacketTest, CompressionStateRetainedAcrossCalls) {
// Ensure that a character sequence is encoded in a more compact manner
// if it is compressed more than once.
int size_1 = Compress("1234").size();
int size_2 = Compress("1234").size();
EXPECT_GT(size_1, size_2);
}
TEST_F(CompressedPacketTest, LargeInput) {
std::string big_str(kMaxPacketPayloadSizeBytes, 'A'); // 3MB of A's.
EXPECT_TRUE(CheckRoundTrip(big_str));
}
TEST_F(CompressedPacketTest, DecompressIllegallyLargePayload) {
// We can't use the compressor to compress an illegally sized payload, however
// we can concatenate the output of smaller payloads to form an uber-payload.
std::string huge_block =
Compress(std::string(kMaxPacketPayloadSizeBytes, 'A')) +
Compress("1337 payl0ad 0verfl0w 'spl0it");
scoped_refptr<net::StringIOBuffer> compressed_str_buf(
new net::StringIOBuffer(huge_block));
scoped_refptr<net::DrainableIOBuffer> compressed_buf(
new net::DrainableIOBuffer(compressed_str_buf.get(),
compressed_str_buf->size()));
scoped_refptr<net::GrowableIOBuffer> decompressed_buf(
new net::GrowableIOBuffer);
EXPECT_CALL(*mock_reader_, ReadPacket(_, _))
.WillOnce(
DoAll(CopyBuffer<0>(compressed_buf),
InvokeCompletionCallback<1>(compressed_buf->BytesRemaining())));
net::TestCompletionCallback completion_cb_2;
compressed_reader_->ReadPacket(decompressed_buf, completion_cb_2.callback());
EXPECT_EQ(net::ERR_FILE_TOO_BIG, completion_cb_2.WaitForResult());
}
TEST_F(CompressedPacketTest, CompressIllegallyLargePayload) {
scoped_refptr<net::IOBuffer> big_buf(
new net::IOBuffer(kMaxPacketPayloadSizeBytes + 1));
scoped_refptr<net::DrainableIOBuffer> content_buf(new net::DrainableIOBuffer(
big_buf.get(), kMaxPacketPayloadSizeBytes + 1));
net::TestCompletionCallback completion_cb_1;
compressed_writer_->WritePacket(content_buf, completion_cb_1.callback());
EXPECT_EQ(net::ERR_FILE_TOO_BIG, completion_cb_1.WaitForResult());
}
TEST_F(CompressedPacketTest, PayloadSmallerThanDeclared) {
scoped_refptr<net::StringIOBuffer> content_str_buf(
new net::StringIOBuffer("Just a small payload"));
scoped_refptr<net::DrainableIOBuffer> content_buf(new net::DrainableIOBuffer(
content_str_buf.get(), content_str_buf->size()));
scoped_refptr<net::DrainableIOBuffer> compressed_buf;
EXPECT_CALL(*mock_writer_, WritePacket(_, _))
.WillOnce(DoAll(SaveArg<0>(&compressed_buf),
InvokeCompletionCallback<1>(net::OK)));
net::TestCompletionCallback completion_cb_1;
compressed_writer_->WritePacket(content_buf, completion_cb_1.callback());
EXPECT_EQ(net::OK, completion_cb_1.WaitForResult());
// Increase the payload size header significantly.
*(reinterpret_cast<uint32_t*>(compressed_buf->data())) =
base::HostToNet32(kMaxPacketPayloadSizeBytes - 1);
EXPECT_CALL(*mock_reader_, ReadPacket(_, _))
.WillOnce(
DoAll(CopyBuffer<0>(compressed_buf),
InvokeCompletionCallback<1>(compressed_buf->BytesRemaining())));
net::TestCompletionCallback completion_cb_2;
compressed_reader_->ReadPacket(make_scoped_refptr(new net::GrowableIOBuffer),
completion_cb_2.callback());
EXPECT_EQ(net::ERR_UNEXPECTED, completion_cb_2.WaitForResult());
}
} // namespace
} // namespace blimp
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