Introduce USB MIDI descriptor parser

media/midi/usb_midi_descriptor_parser_unittest.cc

+// Copyright 2013 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 "media/midi/usb_midi_descriptor_parser.h"
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace media {
+
+namespace {
+
+TEST(UsbMidiDescriptorParserTest, ParseEmpty) {
+  UsbMidiDescriptorParser parser;
+  std::vector<UsbMidiJack> jacks;
+  EXPECT_TRUE(parser.Parse(NULL, NULL, 0, &jacks));
+  EXPECT_TRUE(jacks.empty());
+}
+
+TEST(UsbMidiDescriptorParserTest, InvalidSize) {
+  UsbMidiDescriptorParser parser;
+  std::vector<UsbMidiJack> jacks;
+  uint8 data[] = {0x04};
+  EXPECT_FALSE(parser.Parse(NULL, data, arraysize(data), &jacks));
+  EXPECT_TRUE(jacks.empty());
+}
+
+TEST(UsbMidiDescriptorParserTest, NonExistingJackIsAssociated) {
+  UsbMidiDescriptorParser parser;
+  std::vector<UsbMidiJack> jacks;
+  // Jack id=1 is found in a CS_ENDPOINT descriptor, but there is no definition
+  // for the jack.
+  uint8 data[] = {
+    0x09, 0x04, 0x01, 0x00, 0x02, 0x01, 0x03, 0x00, 0x00, 0x07,
+    0x24, 0x01, 0x00, 0x01, 0x07, 0x00, 0x05, 0x25, 0x01, 0x01,
+    0x01,
+  };
+  EXPECT_FALSE(parser.Parse(NULL, data, arraysize(data), &jacks));
+  EXPECT_TRUE(jacks.empty());
+}
+
+TEST(UsbMidiDescriptorParserTest,
+     JacksShouldBeIgnoredWhenParserIsNotParsingMIDIInterface) {
+  UsbMidiDescriptorParser parser;
+  std::vector<UsbMidiJack> jacks;
+  // a NON-MIDI INTERFACE descriptor followed by ENDPOINT and CS_ENDPOINT
+  // descriptors (Compare with the previous test case).
+  uint8 data[] = {
+    0x09, 0x04, 0x01, 0x00, 0x02, 0x01, 0x02, 0x00, 0x00, 0x07,
+    0x24, 0x01, 0x00, 0x01, 0x07, 0x00, 0x05, 0x25, 0x01, 0x01,
+    0x01,
+  };
+  EXPECT_TRUE(parser.Parse(NULL, data, arraysize(data), &jacks));
+  EXPECT_TRUE(jacks.empty());
+}
+
+TEST(UsbMidiDescriptorParserTest, Parse) {
+  UsbMidiDescriptorParser parser;
+  std::vector<UsbMidiJack> jacks;
+  // A complete device descriptor.
+  uint8 data[] = {
+    0x12, 0x01, 0x10, 0x01, 0x00, 0x00, 0x00, 0x08, 0x86, 0x1a,
+    0x2d, 0x75, 0x54, 0x02, 0x00, 0x02, 0x00, 0x01, 0x09, 0x02,
+    0x75, 0x00, 0x02, 0x01, 0x00, 0x80, 0x30, 0x09, 0x04, 0x00,
+    0x00, 0x00, 0x01, 0x01, 0x00, 0x00, 0x09, 0x24, 0x01, 0x00,
+    0x01, 0x09, 0x00, 0x01, 0x01, 0x09, 0x04, 0x01, 0x00, 0x02,
+    0x01, 0x03, 0x00, 0x00, 0x07, 0x24, 0x01, 0x00, 0x01, 0x51,
+    0x00, 0x06, 0x24, 0x02, 0x01, 0x02, 0x00, 0x06, 0x24, 0x02,
+    0x01, 0x03, 0x00, 0x06, 0x24, 0x02, 0x02, 0x06, 0x00, 0x09,
+    0x24, 0x03, 0x01, 0x07, 0x01, 0x06, 0x01, 0x00, 0x09, 0x24,
+    0x03, 0x02, 0x04, 0x01, 0x02, 0x01, 0x00, 0x09, 0x24, 0x03,
+    0x02, 0x05, 0x01, 0x03, 0x01, 0x00, 0x09, 0x05, 0x02, 0x02,
+    0x20, 0x00, 0x00, 0x00, 0x00, 0x06, 0x25, 0x01, 0x02, 0x02,
+    0x03, 0x09, 0x05, 0x82, 0x02, 0x20, 0x00, 0x00, 0x00, 0x00,
+    0x05, 0x25, 0x01, 0x01, 0x07,
+  };
+  EXPECT_TRUE(parser.Parse(NULL, data, arraysize(data), &jacks));
+  ASSERT_EQ(3u, jacks.size());
+
+  EXPECT_EQ(2u, jacks[0].jack_id);
+  EXPECT_EQ(0u, jacks[0].cable_number);
+  EXPECT_EQ(2u, jacks[0].endpoint_number());
+  EXPECT_EQ(UsbMidiJack::OUT, jacks[0].direction());
+  EXPECT_EQ(NULL, jacks[0].device);
+
+  EXPECT_EQ(3u, jacks[1].jack_id);
+  EXPECT_EQ(1u, jacks[1].cable_number);
+  EXPECT_EQ(2u, jacks[1].endpoint_number());
+  EXPECT_EQ(UsbMidiJack::OUT, jacks[1].direction());
+  EXPECT_EQ(NULL, jacks[1].device);
+
+  EXPECT_EQ(7u, jacks[2].jack_id);
+  EXPECT_EQ(0u, jacks[2].cable_number);
+  EXPECT_EQ(2u, jacks[2].endpoint_number());
+  EXPECT_EQ(UsbMidiJack::IN, jacks[2].direction());
+  EXPECT_EQ(NULL, jacks[2].device);
+}
+
+}  // namespace
+
+}  // namespace media