[WebMIDI] [Android] Set appropriate port properties.

media/midi/usb_midi_device_android.cc

 // Copyright 2014 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_device_android.h"
 
 #include <jni.h>
 #include <vector>
 
 #include "base/android/jni_array.h"
+#include "base/i18n/icu_string_conversions.h"
+#include "base/strings/stringprintf.h"
 #include "base/time/time.h"
 #include "jni/UsbMidiDeviceAndroid_jni.h"
+#include "media/midi/usb_midi_descriptor_parser.h"
 
 namespace media {
 
 UsbMidiDeviceAndroid::UsbMidiDeviceAndroid(ObjectRef raw_device,
                                            UsbMidiDeviceDelegate* delegate)
     : raw_device_(raw_device), delegate_(delegate) {
   JNIEnv* env = base::android::AttachCurrentThread();
   Java_UsbMidiDeviceAndroid_registerSelf(
       env, raw_device_.obj(), reinterpret_cast<jlong>(this));
+
+  GetDescriptorsInternal();
+  InitDeviceInfo();
 }
 
 UsbMidiDeviceAndroid::~UsbMidiDeviceAndroid() {
   JNIEnv* env = base::android::AttachCurrentThread();
   Java_UsbMidiDeviceAndroid_close(env, raw_device_.obj());
 }
 
-std::vector<uint8> UsbMidiDeviceAndroid::GetDescriptor() {
-  JNIEnv* env = base::android::AttachCurrentThread();
-  base::android::ScopedJavaLocalRef<jbyteArray> descriptors =
-      Java_UsbMidiDeviceAndroid_getDescriptors(env, raw_device_.obj());
+std::vector<uint8> UsbMidiDeviceAndroid::GetDescriptors() {
+  return descriptors_;
+}
 
-  std::vector<uint8> ret;
-  base::android::JavaByteArrayToByteVector(env, descriptors.obj(), &ret);
-  return ret;
+std::string UsbMidiDeviceAndroid::GetManufacturer() {
+  return manufacturer_;
+}
+
+std::string UsbMidiDeviceAndroid::GetProductName() {
+  return product_;
+}
+
+std::string UsbMidiDeviceAndroid::GetDeviceVersion() {
+  return device_version_;
 }
 
 void UsbMidiDeviceAndroid::Send(int endpoint_number,
                                 const std::vector<uint8>& data) {
   JNIEnv* env = base::android::AttachCurrentThread();
   const uint8* head = data.size() ? &data[0] : NULL;
   ScopedJavaLocalRef<jbyteArray> data_to_pass =
       base::android::ToJavaByteArray(env, head, data.size());
 
   Java_UsbMidiDeviceAndroid_send(
       env, raw_device_.obj(), endpoint_number, data_to_pass.obj());
 }
 
 void UsbMidiDeviceAndroid::OnData(JNIEnv* env,
                                   jobject caller,
                                   jint endpoint_number,
                                   jbyteArray data) {
   std::vector<uint8> bytes;
   base::android::JavaByteArrayToByteVector(env, data, &bytes);
 
   const uint8* head = bytes.size() ? &bytes[0] : NULL;
   delegate_->ReceiveUsbMidiData(this, endpoint_number, head, bytes.size(),
                                 base::TimeTicks::Now());
 }
 
 bool UsbMidiDeviceAndroid::RegisterUsbMidiDevice(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
+void UsbMidiDeviceAndroid::GetDescriptorsInternal() {
+  JNIEnv* env = base::android::AttachCurrentThread();
+  base::android::ScopedJavaLocalRef<jbyteArray> descriptors =
+      Java_UsbMidiDeviceAndroid_getDescriptors(env, raw_device_.obj());
+
+  base::android::JavaByteArrayToByteVector(env, descriptors.obj(),
+                                           &descriptors_);
+}
+
+void UsbMidiDeviceAndroid::InitDeviceInfo() {
+  UsbMidiDescriptorParser parser;
+  UsbMidiDescriptorParser::DeviceInfo info;
+
+  const uint8* data = descriptors_.size() > 0 ? &descriptors_[0] : nullptr;
+
+  if (!parser.ParseDeviceInfo(data, descriptors_.size(), &info)) {
+    // We don't report the error here. If it is critical, we will realize it
+    // when we parse the descriptors again for ports.
+    manufacturer_ = "invalid descriptor";
+    product_ = "invalid descriptor";
+    device_version_ = "invalid descriptor";
+    return;
+  }
+
+  manufacturer_ =
+      GetString(info.manufacturer_index,
+                base::StringPrintf("(vendor id = 0x%04x)", info.vendor_id));
+  product_ =
+      GetString(info.product_index,
+                base::StringPrintf("(product id = 0x%04x)", info.product_id));
+  device_version_ = info.BcdVersionToString(info.bcd_device_version);
+}
+
+std::vector<uint8> UsbMidiDeviceAndroid::GetStringDescriptor(int index) {
+  JNIEnv* env = base::android::AttachCurrentThread();
+  base::android::ScopedJavaLocalRef<jbyteArray> descriptors =
+      Java_UsbMidiDeviceAndroid_getStringDescriptor(env, raw_device_.obj(),
+                                                    index);
+
+  std::vector<uint8> ret;
+  base::android::JavaByteArrayToByteVector(env, descriptors.obj(), &ret);
+  return ret;
+}
+
+std::string UsbMidiDeviceAndroid::GetString(int index,
+                                            const std::string& backup) {
+  const uint8 DESCRIPTOR_TYPE_STRING = 3;
+
+  if (!index) {
+    // index 0 means there is no such descriptor.
+    return backup;
+  }
+  std::vector<uint8> descriptor = GetStringDescriptor(index);
+  if (descriptor.size() < 2 || descriptor.size() < descriptor[0] ||
+      descriptor[1] != DESCRIPTOR_TYPE_STRING) {
+    // |descriptor| is not a valid string descriptor.
+    return backup;
+  }
+  size_t size = descriptor[0];
+  std::string encoded(reinterpret_cast<char*>(&descriptor[0]) + 2, size - 2);
+  std::string result;
+  // Unicode ECN specifies that the string is encoded in UTF-16LE.
+  if (!base::ConvertToUtf8AndNormalize(encoded, "utf-16le", &result))
+    return backup;
+  return result;
+}
+
 }  // namespace media