[Android] Implement renderer side of Gin Java Bridge

content/renderer/java/gin_java_bridge_value_converter.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 "content/renderer/java/gin_java_bridge_value_converter.h"
+
+#include "base/float_util.h"
+#include "base/values.h"
+#include "content/common/android/gin_java_bridge_value.h"
+#include "content/renderer/java/gin_java_bridge_object.h"
+#include "gin/array_buffer.h"
+
+namespace content {
+
+GinJavaBridgeValueConverter::GinJavaBridgeValueConverter()
+    : converter_(V8ValueConverter::create()) {
+  converter_->SetDateAllowed(false);
+  converter_->SetRegExpAllowed(false);
+  converter_->SetFunctionAllowed(true);
+  converter_->SetStrategy(this);
+}
+
+GinJavaBridgeValueConverter::~GinJavaBridgeValueConverter() {
+}
+
+v8::Handle<v8::Value> GinJavaBridgeValueConverter::ToV8Value(
+    const base::Value* value,
+    v8::Handle<v8::Context> context) const {
+  return converter_->ToV8Value(value, context);
+}
+
+scoped_ptr<base::Value> GinJavaBridgeValueConverter::FromV8Value(
+    v8::Handle<v8::Value> value,
+    v8::Handle<v8::Context> context) const {
+  return make_scoped_ptr(converter_->FromV8Value(value, context));
+}
+
+bool GinJavaBridgeValueConverter::FromV8Object(
+    v8::Handle<v8::Object> value,
+    base::Value** out,
+    v8::Isolate* isolate,
+    const FromV8ValueCallback& callback) const {
+  GinJavaBridgeObject* unwrapped;
+  if (!gin::ConvertFromV8(isolate, value, &unwrapped)) {
+    return false;
+  }
+  *out =
+      GinJavaBridgeValue::CreateObjectIDValue(unwrapped->object_id()).release();
+  return true;
+}
+
+namespace {
+
+class TypedArraySerializer {
+ public:
+  virtual ~TypedArraySerializer() {}
+  static scoped_ptr<TypedArraySerializer> Create(
+      v8::Handle<v8::TypedArray> typed_array);
+  virtual void serializeTo(char* data,
+                           size_t data_length,
+                           base::ListValue* out) = 0;
+ protected:
+  TypedArraySerializer() {}
+};
+
+template <typename ElementType, typename ListType>
+class TypedArraySerializerImpl : public TypedArraySerializer {
+ public:
+  static scoped_ptr<TypedArraySerializer> Create(
+      v8::Handle<v8::TypedArray> typed_array) {
+    scoped_ptr<TypedArraySerializerImpl<ElementType, ListType> > result(
+        new TypedArraySerializerImpl<ElementType, ListType>(typed_array));
+    return result.template PassAs<TypedArraySerializer>();
+  }
+
+  virtual void serializeTo(char* data,
+                   size_t data_length,
+                   base::ListValue* out) OVERRIDE {
+    DCHECK_EQ(data_length, typed_array_->Length() * sizeof(ElementType));
+    for (ElementType *element = reinterpret_cast<ElementType*>(data),
+                     *end = element + typed_array_->Length();
+         element != end;
+         ++element) {
+      const ListType list_value = *element;
+      out->Append(new base::FundamentalValue(list_value));
+    }
+  }
+
+ private:
+  explicit TypedArraySerializerImpl(v8::Handle<v8::TypedArray> typed_array)
+      : typed_array_(typed_array) {}
+
+  v8::Handle<v8::TypedArray> typed_array_;
+
+  DISALLOW_COPY_AND_ASSIGN(TypedArraySerializerImpl);
+};
+
+// static
+scoped_ptr<TypedArraySerializer> TypedArraySerializer::Create(
+    v8::Handle<v8::TypedArray> typed_array) {
+  if (typed_array->IsInt8Array() ||
+      typed_array->IsUint8Array() ||
+      typed_array->IsUint8ClampedArray()) {
+    return TypedArraySerializerImpl<char, int>::Create(typed_array).Pass();
+  } else if (typed_array->IsInt16Array() || typed_array->IsUint16Array()) {
+    return TypedArraySerializerImpl<int16_t, int>::Create(typed_array).Pass();
+  } else if (typed_array->IsInt32Array() || typed_array->IsUint32Array()) {
+    return TypedArraySerializerImpl<int32_t, int>::Create(typed_array).Pass();
+  } else if (typed_array->IsFloat32Array()) {
+    return TypedArraySerializerImpl<float, double>::Create(typed_array).Pass();
+  } else if (typed_array->IsFloat64Array()) {
+    return TypedArraySerializerImpl<double, double>::Create(typed_array).Pass();
+  }
+  NOTREACHED();
+  return scoped_ptr<TypedArraySerializer>();
+}
+
+}  // namespace
+
+bool GinJavaBridgeValueConverter::FromV8ArrayBuffer(
+    v8::Handle<v8::Object> value,
+    base::Value** out,
+    v8::Isolate* isolate) const {
+  if (!value->IsTypedArray()) {
+    *out = GinJavaBridgeValue::CreateUndefinedValue().release();
+    return true;
+  }
+
+  char* data = NULL;
+  size_t data_length = 0;
+  gin::ArrayBufferView view;
+  if (ConvertFromV8(isolate, value.As<v8::ArrayBufferView>(), &view)) {
+    data = reinterpret_cast<char*>(view.bytes());
+    data_length = view.num_bytes();
+  }
+  if (!data) {
+    *out = GinJavaBridgeValue::CreateUndefinedValue().release();
+    return true;
+  }
+
+  base::ListValue* result = new base::ListValue();
+  *out = result;
+  scoped_ptr<TypedArraySerializer> serializer(
+      TypedArraySerializer::Create(value.As<v8::TypedArray>()));
+  serializer->serializeTo(data, data_length, result);
+  return true;
+}
+
+bool GinJavaBridgeValueConverter::FromV8Number(v8::Handle<v8::Number> value,
+                                               base::Value** out) const {
+  double double_value = value->Value();
+  if (base::IsFinite(double_value))
+    return false;
+  *out = GinJavaBridgeValue::CreateNonFiniteValue(double_value).release();
+  return true;
+}
+
+bool GinJavaBridgeValueConverter::FromV8Undefined(base::Value** out) const {
+  *out = GinJavaBridgeValue::CreateUndefinedValue().release();
+  return true;
+}
+
+}  // namespace content