Source/WebKit2/Shared/UserMessageCoders.h

/*
 * Copyright (C) 2010 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef UserMessageCoders_h
#define UserMessageCoders_h

#include "APIArray.h"
#include "APIData.h"
#include "APIError.h"
#include "APIGeometry.h"
#include "APINumber.h"
#include "APIString.h"
#include "APIURL.h"
#include "APIURLRequest.h"
#include "APIURLResponse.h"
#include "ArgumentDecoder.h"
#include "ArgumentEncoder.h"
#include "DataReference.h"
#include "ImmutableDictionary.h"
#include "ShareableBitmap.h"
#include "WebCertificateInfo.h"
#include "WebCoreArgumentCoders.h"
#include "WebImage.h"
#include "WebRenderLayer.h"
#include "WebRenderObject.h"
#include "WebSerializedScriptValue.h"
#include "WebUserContentURLPattern.h"

namespace WebKit {

//   - Null -> Null
//   - API::Array -> API::Array
//   - Dictionary -> Dictionary
//   - SerializedScriptValue -> SerializedScriptValue
//   - API::String -> API::String
//   - UserContentURLPattern -> UserContentURLPattern
//   - WebCertificateInfo -> WebCertificateInfo
//   - API::Data -> API::Data
//   - API::Double -> API::Double
//   - WebImage -> WebImage
//   - WebRenderLayer -> WebRenderLayer
//   - WebRenderObject -> WebRenderObject
//   - API::UInt64 -> API::UInt64
//   - API::URL -> API::URL
//   - API::URLRequest -> API::URLRequest
//   - API::URLResponse -> API::URLResponse
//   - API::Error -> API::Error

template<typename Owner>
class UserMessageEncoder {
public:
    bool baseEncode(IPC::ArgumentEncoder& encoder, const Owner& coder, API::Object::Type& type) const
    {
        if (!m_root) {
            encoder << static_cast<uint32_t>(API::Object::Type::Null);
            return true;
        }

        type = m_root->type();
        encoder << static_cast<uint32_t>(type);

        switch (type) {
        case API::Object::Type::Array: {
            API::Array* array = static_cast<API::Array*>(m_root);
            encoder << static_cast<uint64_t>(array->size());
            for (size_t i = 0; i < array->size(); ++i)
                encoder << Owner(coder, array->at(i));
            return true;
        }
        case API::Object::Type::Dictionary: {
            ImmutableDictionary* dictionary = static_cast<ImmutableDictionary*>(m_root);
            const ImmutableDictionary::MapType& map = dictionary->map();
            encoder << static_cast<uint64_t>(map.size());

            ImmutableDictionary::MapType::const_iterator it = map.begin();
            ImmutableDictionary::MapType::const_iterator end = map.end();
            for (; it != end; ++it) {
                encoder << it->key;
                encoder << Owner(coder, it->value.get());
            }
            return true;
        }
        case API::Object::Type::String: {
            API::String* string = static_cast<API::String*>(m_root);
            encoder << string->string();
            return true;
        }
        case API::Object::Type::SerializedScriptValue: {
            WebSerializedScriptValue* scriptValue = static_cast<WebSerializedScriptValue*>(m_root);
            encoder << scriptValue->dataReference();
            return true;
        }
        case API::Object::Type::Boolean: {
            API::Boolean* booleanObject = static_cast<API::Boolean*>(m_root);
            encoder << booleanObject->value();
            return true;
        }
        case API::Object::Type::Double: {
            API::Double* doubleObject = static_cast<API::Double*>(m_root);
            encoder << doubleObject->value();
            return true;
        }
        case API::Object::Type::UInt64: {
            API::UInt64* uint64Object = static_cast<API::UInt64*>(m_root);
            encoder << uint64Object->value();
            return true;
        }
        case API::Object::Type::Point: {
            API::Point* pointObject = static_cast<API::Point*>(m_root);
            encoder << pointObject->point().x;
            encoder << pointObject->point().y;
            return true;
        }
        case API::Object::Type::Size: {
            API::Size* sizeObject = static_cast<API::Size*>(m_root);
            encoder << sizeObject->size().width;
            encoder << sizeObject->size().height;
            return true;
        }
        case API::Object::Type::Rect: {
            API::Rect* rectObject = static_cast<API::Rect*>(m_root);
            encoder << rectObject->rect().origin.x;
            encoder << rectObject->rect().origin.y;
            encoder << rectObject->rect().size.width;
            encoder << rectObject->rect().size.height;
            return true;
        }
        case API::Object::Type::RenderLayer: {
            WebRenderLayer* renderLayer = static_cast<WebRenderLayer*>(m_root);
            encoder << Owner(coder, renderLayer->renderer());
            encoder << renderLayer->isReflection();
            encoder << renderLayer->isClipping();
            encoder << renderLayer->isClipped();
            encoder << static_cast<uint32_t>(renderLayer->compositingLayerType());
            encoder << renderLayer->absoluteBoundingBox();
            encoder << Owner(coder, renderLayer->negativeZOrderList());
            encoder << Owner(coder, renderLayer->normalFlowList());
            encoder << Owner(coder, renderLayer->positiveZOrderList());
            return true;
        }
        case API::Object::Type::RenderObject: {
            WebRenderObject* renderObject = static_cast<WebRenderObject*>(m_root);
            encoder << renderObject->name();
            encoder << renderObject->elementTagName();
            encoder << renderObject->elementID();
            encoder << Owner(coder, renderObject->elementClassNames());
            encoder << renderObject->absolutePosition();
            encoder << renderObject->frameRect();
            encoder << Owner(coder, renderObject->children());
            return true;
        }
        case API::Object::Type::URL: {
            API::URL* urlObject = static_cast<API::URL*>(m_root);
            encoder << urlObject->string();
            return true;
        }
        case API::Object::Type::URLRequest: {
            API::URLRequest* urlRequestObject = static_cast<API::URLRequest*>(m_root);
            encoder << urlRequestObject->resourceRequest();
            return true;
        }
        case API::Object::Type::URLResponse: {
            API::URLResponse* urlResponseObject = static_cast<API::URLResponse*>(m_root);
            encoder << urlResponseObject->resourceResponse();
            return true;
        }
        case API::Object::Type::UserContentURLPattern: {
            WebUserContentURLPattern* urlPattern = static_cast<WebUserContentURLPattern*>(m_root);
            encoder << urlPattern->patternString();
            return true;
        }
        case API::Object::Type::Image: {
            WebImage* image = static_cast<WebImage*>(m_root);

            ShareableBitmap::Handle handle;
            ASSERT(!image->bitmap() || image->bitmap()->isBackedBySharedMemory());            
            if (!image->bitmap() || !image->bitmap()->isBackedBySharedMemory() || !image->bitmap()->createHandle(handle)) {
                // Initial false indicates no allocated bitmap or is not shareable.
                encoder << false;
                return true;
            }

            // Initial true indicates a bitmap was allocated and is shareable.
            encoder << true;

            encoder << handle;
            return true;
        }
        case API::Object::Type::Data: {
            API::Data* data = static_cast<API::Data*>(m_root);
            encoder << data->dataReference();
            return true;
        }
        case API::Object::Type::CertificateInfo: {
            WebCertificateInfo* certificateInfo = static_cast<WebCertificateInfo*>(m_root);
            encoder << certificateInfo->certificateInfo();
            return true;
        }
        case API::Object::Type::Error: {
            API::Error* errorObject = static_cast<API::Error*>(m_root);
            encoder << errorObject->platformError();
            return true;
        }
        default:
            break;
        }

        return false;
    }

protected:
    UserMessageEncoder(API::Object* root) 
        : m_root(root)
    {
    }

    API::Object* m_root;
};


// Handles
//   - Null -> Null
//   - API::Array -> API::Array
//   - Dictionary -> Dictionary
//   - SerializedScriptValue -> SerializedScriptValue
//   - API::String -> API::String
//   - UserContentURLPattern -> UserContentURLPattern
//   - WebCertificateInfo -> WebCertificateInfo
//   - API::Data -> API::Data
//   - API::Double -> API::Double
//   - WebImage -> WebImage
//   - API::UInt64 -> API::UInt64
//   - API::URL -> API::URL
//   - API::URLRequest -> API::URLRequest
//   - API::URLResponse -> API::URLResponse
//   - API::Error -> API::Error

template<typename Owner>
class UserMessageDecoder {
public:
    static bool baseDecode(IPC::ArgumentDecoder& decoder, Owner& coder, API::Object::Type& type)
    {
        uint32_t typeAsUInt32;
        if (!decoder.decode(typeAsUInt32))
            return false;

        type = static_cast<API::Object::Type>(typeAsUInt32);

        switch (type) {
        case API::Object::Type::Array: {
            uint64_t size;
            if (!decoder.decode(size))
                return false;

            Vector<RefPtr<API::Object>> vector;
            for (size_t i = 0; i < size; ++i) {
                RefPtr<API::Object> element;
                Owner messageCoder(coder, element);
                if (!decoder.decode(messageCoder))
                    return false;
                vector.append(element.release());
            }

            coder.m_root = API::Array::create(std::move(vector));
            break;
        }
        case API::Object::Type::Dictionary: {
            uint64_t size;
            if (!decoder.decode(size))
                return false;

            ImmutableDictionary::MapType map;
            for (size_t i = 0; i < size; ++i) {
                String key;
                if (!decoder.decode(key))
                    return false;

                RefPtr<API::Object> element;
                Owner messageCoder(coder, element);
                if (!decoder.decode(messageCoder))
                    return false;

                ImmutableDictionary::MapType::AddResult result = map.set(key, element.release());
                if (!result.isNewEntry)
                    return false;
            }

            coder.m_root = ImmutableDictionary::create(std::move(map));
            break;
        }
        case API::Object::Type::String: {
            String string;
            if (!decoder.decode(string))
                return false;
            coder.m_root = API::String::create(string);
            break;
        }
        case API::Object::Type::SerializedScriptValue: {
            IPC::DataReference dataReference;
            if (!decoder.decode(dataReference))
                return false;
            
            Vector<uint8_t> vector = dataReference.vector();
            coder.m_root = WebSerializedScriptValue::adopt(vector);
            break;
        }
        case API::Object::Type::Double: {
            double value;
            if (!decoder.decode(value))
                return false;
            coder.m_root = API::Double::create(value);
            break;
        }
        case API::Object::Type::UInt64: {
            uint64_t value;
            if (!decoder.decode(value))
                return false;
            coder.m_root = API::UInt64::create(value);
            break;
        }
        case API::Object::Type::Boolean: {
            bool value;
            if (!decoder.decode(value))
                return false;
            coder.m_root = API::Boolean::create(value);
            break;
        }
        case API::Object::Type::Size: {
            double width;
            double height;
            if (!decoder.decode(width))
                return false;
            if (!decoder.decode(height))
                return false;
            coder.m_root = API::Size::create(WKSizeMake(width, height));
            break;
        }
        case API::Object::Type::Point: {
            double x;
            double y;
            if (!decoder.decode(x))
                return false;
            if (!decoder.decode(y))
                return false;
            coder.m_root = API::Point::create(WKPointMake(x, y));
            break;
        }
        case API::Object::Type::Rect: {
            double x;
            double y;
            double width;
            double height;
            if (!decoder.decode(x))
                return false;
            if (!decoder.decode(y))
                return false;
            if (!decoder.decode(width))
                return false;
            if (!decoder.decode(height))
                return false;
            coder.m_root = API::Rect::create(WKRectMake(x, y, width, height));
            break;
        }
        case API::Object::Type::RenderLayer: {
            RefPtr<API::Object> renderer;
            bool isReflection;
            bool isClipping;
            bool isClipped;
            uint32_t compositingLayerTypeAsUInt32;
            WebCore::IntRect absoluteBoundingBox;
            RefPtr<API::Object> negativeZOrderList;
            RefPtr<API::Object> normalFlowList;
            RefPtr<API::Object> positiveZOrderList;

            Owner rendererCoder(coder, renderer);
            if (!decoder.decode(rendererCoder))
                return false;
            if (renderer->type() != API::Object::Type::RenderObject)
                return false;
            if (!decoder.decode(isReflection))
                return false;
            if (!decoder.decode(isClipping))
                return false;
            if (!decoder.decode(isClipped))
                return false;
            if (!decoder.decode(compositingLayerTypeAsUInt32))
                return false;
            if (!decoder.decode(absoluteBoundingBox))
                return false;
            Owner negativeZOrderListCoder(coder, negativeZOrderList);
            if (!decoder.decode(negativeZOrderListCoder))
                return false;
            Owner normalFlowListCoder(coder, normalFlowList);
            if (!decoder.decode(normalFlowListCoder))
                return false;
            Owner positiveZOrderListCoder(coder, positiveZOrderList);
            if (!decoder.decode(positiveZOrderListCoder))
                return false;
            coder.m_root = WebRenderLayer::create(static_pointer_cast<WebRenderObject>(renderer), isReflection, isClipping, isClipped, static_cast<WebRenderLayer::CompositingLayerType>(compositingLayerTypeAsUInt32),
                absoluteBoundingBox, static_pointer_cast<API::Array>(negativeZOrderList), static_pointer_cast<API::Array>(normalFlowList),
                static_pointer_cast<API::Array>(positiveZOrderList));
            break;
        }
        case API::Object::Type::RenderObject: {
            String name;
            String elementTagName;
            String elementID;
            RefPtr<API::Object> elementClassNames;
            WebCore::IntPoint absolutePosition;
            WebCore::IntRect frameRect;
            RefPtr<API::Object> children;
            
            if (!decoder.decode(name))
                return false;
            if (!decoder.decode(elementTagName))
                return false;
            if (!decoder.decode(elementID))
                return false;
            Owner classNamesCoder(coder, elementClassNames);
            if (!decoder.decode(classNamesCoder))
                return false;
            if (!decoder.decode(absolutePosition))
                return false;
            if (!decoder.decode(frameRect))
                return false;
            Owner messageCoder(coder, children);
            if (!decoder.decode(messageCoder))
                return false;
            if (children && children->type() != API::Object::Type::Array)
                return false;
            coder.m_root = WebRenderObject::create(name, elementTagName, elementID, static_pointer_cast<API::Array>(elementClassNames), absolutePosition, frameRect, static_pointer_cast<API::Array>(children));
            break;
        }
        case API::Object::Type::URL: {
            String string;
            if (!decoder.decode(string))
                return false;
            coder.m_root = API::URL::create(string);
            break;
        }
        case API::Object::Type::URLRequest: {
            WebCore::ResourceRequest request;
            if (!decoder.decode(request))
                return false;
            coder.m_root = API::URLRequest::create(request);
            break;
        }
        case API::Object::Type::URLResponse: {
            WebCore::ResourceResponse response;
            if (!decoder.decode(response))
                return false;
            coder.m_root = API::URLResponse::create(response);
            break;
        }
        case API::Object::Type::UserContentURLPattern: {
            String string;
            if (!decoder.decode(string))
                return false;
            coder.m_root = WebUserContentURLPattern::create(string);
            break;
        }
        case API::Object::Type::Image: {
            bool didEncode = false;
            if (!decoder.decode(didEncode))
                return false;

            if (!didEncode)
                break;

            ShareableBitmap::Handle handle;
            if (!decoder.decode(handle))
                return false;

            coder.m_root = WebImage::create(ShareableBitmap::create(handle));
            return true;
        }
        case API::Object::Type::Data: {
            IPC::DataReference dataReference;
            if (!decoder.decode(dataReference))
                return false;
            coder.m_root = API::Data::create(dataReference.data(), dataReference.size());
            break;
        }
        case API::Object::Type::CertificateInfo: {
            WebCore::CertificateInfo certificateInfo;
            if (!decoder.decode(certificateInfo))
                return false;
            coder.m_root = WebCertificateInfo::create(certificateInfo);
            break;
        }
        case API::Object::Type::Error: {
            WebCore::ResourceError resourceError;
            if (!decoder.decode(resourceError))
                return false;
            coder.m_root = API::Error::create(resourceError);
            break;
        }
        default:
            break;
        }

        return true;
    }

protected:
    UserMessageDecoder(RefPtr<API::Object>& root)
        : m_root(root)
    {
    }

    RefPtr<API::Object>& m_root;
};

} // namespace WebKit

#endif // UserMessageCoders_h