remoting/protocol/message_decoder_unittest.cc

   1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include <string>
   6
   7 #include "base/memory/scoped_ptr.h"
   8 #include "base/stl_util.h"
   9 #include "base/strings/string_number_conversions.h"
  10 #include "remoting/proto/event.pb.h"
  11 #include "remoting/proto/internal.pb.h"
  12 #include "remoting/protocol/message_decoder.h"
  13 #include "remoting/protocol/message_serialization.h"
  14 #include "testing/gtest/include/gtest/gtest.h"
  15
  16 namespace remoting {
  17 namespace protocol {
  18
  19 static const unsigned int kTestKey = 142;
  20
  21 static void AppendMessage(const EventMessage& msg,
  22                           std::string* buffer) {
  23   // Contains one encoded message.
  24   scoped_refptr<net::IOBufferWithSize> encoded_msg;
  25   encoded_msg = SerializeAndFrameMessage(msg);
  26   buffer->append(encoded_msg->data(), encoded_msg->size());
  27 }
  28
  29 // Construct and prepare data in the |output_stream|.
  30 static void PrepareData(uint8** buffer, int* size) {
  31   // Contains all encoded messages.
  32   std::string encoded_data;
  33
  34   // Then append 10 update sequences to the data.
  35   for (int i = 0; i < 10; ++i) {
  36     EventMessage msg;
  37     msg.set_timestamp(i);
  38     msg.mutable_key_event()->set_usb_keycode(kTestKey + i);
  39     msg.mutable_key_event()->set_pressed((i % 2) != 0);
  40     AppendMessage(msg, &encoded_data);
  41   }
  42
  43   *size = encoded_data.length();
  44   *buffer = new uint8[*size];
  45   memcpy(*buffer, encoded_data.c_str(), *size);
  46 }
  47
  48 void SimulateReadSequence(const int read_sequence[], int sequence_size) {
  49   // Prepare encoded data for testing.
  50   int size;
  51   uint8* test_data;
  52   PrepareData(&test_data, &size);
  53   scoped_ptr<uint8[]> memory_deleter(test_data);
  54
  55   // Then simulate using MessageDecoder to decode variable
  56   // size of encoded data.
  57   // The first thing to do is to generate a variable size of data. This is done
  58   // by iterating the following array for read sizes.
  59   MessageDecoder decoder;
  60
  61   // Then feed the protocol decoder using the above generated data and the
  62   // read pattern.
  63   std::list<EventMessage*> message_list;
  64   for (int pos = 0; pos < size;) {
  65     SCOPED_TRACE("Input position: " + base::IntToString(pos));
  66
  67     // First generate the amount to feed the decoder.
  68     int read = std::min(size - pos, read_sequence[pos % sequence_size]);
  69
  70     // And then prepare an IOBuffer for feeding it.
  71     scoped_refptr<net::IOBuffer> buffer(new net::IOBuffer(read));
  72     memcpy(buffer->data(), test_data + pos, read);
  73     decoder.AddData(buffer, read);
  74     while (true) {
  75       scoped_ptr<CompoundBuffer> message(decoder.GetNextMessage());
  76       if (!message.get())
  77         break;
  78
  79       EventMessage* event = new EventMessage();
  80       CompoundBufferInputStream stream(message.get());
  81       ASSERT_TRUE(event->ParseFromZeroCopyStream(&stream));
  82       message_list.push_back(event);
  83     }
  84     pos += read;
  85   }
  86
  87   // Then verify the decoded messages.
  88   EXPECT_EQ(10u, message_list.size());
  89
  90   unsigned int index = 0;
  91   for (std::list<EventMessage*>::iterator it =
  92            message_list.begin();
  93        it != message_list.end(); ++it) {
  94     SCOPED_TRACE("Message " + base::UintToString(index));
  95
  96     EventMessage* message = *it;
  97     // Partial update stream.
  98     EXPECT_TRUE(message->has_key_event());
  99
 100     // TODO(sergeyu): Don't use index here. Instead store the expected values
 101     // in an array.
 102     EXPECT_EQ(kTestKey + index, message->key_event().usb_keycode());
 103     EXPECT_EQ((index % 2) != 0, message->key_event().pressed());
 104     ++index;
 105   }
 106   STLDeleteElements(&message_list);
 107 }
 108
 109 TEST(MessageDecoderTest, SmallReads) {
 110   const int kReads[] = {1, 2, 3, 1};
 111   SimulateReadSequence(kReads, arraysize(kReads));
 112 }
 113
 114 TEST(MessageDecoderTest, LargeReads) {
 115   const int kReads[] = {50, 50, 5};
 116   SimulateReadSequence(kReads, arraysize(kReads));
 117 }
 118
 119 TEST(MessageDecoderTest, EmptyReads) {
 120   const int kReads[] = {4, 0, 50, 0};
 121   SimulateReadSequence(kReads, arraysize(kReads));
 122 }
 123
 124 }  // namespace protocol
 125 }  // namespace remoting