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// Copyright 2011 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "remoting/protocol/message_decoder.h"
#include <stdint.h>
#include <list>
#include <memory>
#include <string>
#include "base/compiler_specific.h"
#include "base/containers/heap_array.h"
#include "base/containers/span.h"
#include "base/strings/string_number_conversions.h"
#include "remoting/proto/event.pb.h"
#include "remoting/proto/internal.pb.h"
#include "remoting/protocol/message_serialization.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace remoting::protocol {
static const unsigned int kTestKey = 142;
static void AppendMessage(const EventMessage& msg, std::string* buffer) {
// Contains one encoded message.
scoped_refptr<net::IOBufferWithSize> encoded_msg;
encoded_msg = SerializeAndFrameMessage(msg);
buffer->append(encoded_msg->data(), encoded_msg->size());
}
// Construct and prepare data in the |output_stream|.
static base::HeapArray<uint8_t> PrepareData(int* size) {
// Contains all encoded messages.
std::string encoded_data;
// Then append 10 update sequences to the data.
for (int i = 0; i < 10; ++i) {
EventMessage msg;
msg.set_timestamp(i);
msg.mutable_key_event()->set_usb_keycode(kTestKey + i);
msg.mutable_key_event()->set_pressed((i % 2) != 0);
AppendMessage(msg, &encoded_data);
}
*size = encoded_data.length();
auto buffer = base::HeapArray<uint8_t>::Uninit(*size);
base::span(buffer).copy_from(base::as_byte_span(encoded_data));
return buffer;
}
void SimulateReadSequence(base::span<const int> read_sequence) {
// Prepare encoded data for testing.
int size;
auto test_data = PrepareData(&size);
// Then simulate using MessageDecoder to decode variable
// size of encoded data.
// The first thing to do is to generate a variable size of data. This is done
// by iterating the following array for read sizes.
MessageDecoder decoder;
// Then feed the protocol decoder using the above generated data and the
// read pattern.
std::list<std::unique_ptr<EventMessage>> message_list;
for (int pos = 0; pos < size;) {
SCOPED_TRACE("Input position: " + base::NumberToString(pos));
// First generate the amount to feed the decoder.
int read = std::min(size - pos, read_sequence[pos % read_sequence.size()]);
// And then prepare an IOBuffer for feeding it.
auto buffer = base::MakeRefCounted<net::IOBufferWithSize>(read);
buffer->first(read).copy_from(base::span(test_data).subspan(
static_cast<size_t>(pos), static_cast<size_t>(read)));
decoder.AddData(buffer, read);
while (true) {
std::unique_ptr<CompoundBuffer> message(decoder.GetNextMessage());
if (!message.get()) {
break;
}
std::unique_ptr<EventMessage> event = std::make_unique<EventMessage>();
CompoundBufferInputStream stream(message.get());
ASSERT_TRUE(event->ParseFromZeroCopyStream(&stream));
message_list.push_back(std::move(event));
}
pos += read;
}
// Then verify the decoded messages.
EXPECT_EQ(10u, message_list.size());
unsigned int index = 0;
for (const auto& message : message_list) {
SCOPED_TRACE("Message " + base::NumberToString(index));
// Partial update stream.
EXPECT_TRUE(message->has_key_event());
// TODO(sergeyu): Don't use index here. Instead store the expected values
// in an array.
EXPECT_EQ(kTestKey + index, message->key_event().usb_keycode());
EXPECT_EQ((index % 2) != 0, message->key_event().pressed());
++index;
}
}
TEST(MessageDecoderTest, SmallReads) {
const int kReads[] = {1, 2, 3, 1};
SimulateReadSequence(kReads);
}
TEST(MessageDecoderTest, LargeReads) {
const int kReads[] = {50, 50, 5};
SimulateReadSequence(kReads);
}
TEST(MessageDecoderTest, EmptyReads) {
const int kReads[] = {4, 0, 50, 0};
SimulateReadSequence(kReads);
}
} // namespace remoting::protocol
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