C++ SharedBuffer::createCFData方法代码示例

std::unique_ptr<FontCustomPlatformData> createFontCustomPlatformData(SharedBuffer& buffer)
{
    RetainPtr<CFDataRef> bufferData = buffer.createCFData();

    RetainPtr<CTFontDescriptorRef> fontDescriptor = adoptCF(CTFontManagerCreateFontDescriptorFromData(bufferData.get()));
    if (!fontDescriptor)
        return nullptr;

    return std::make_unique<FontCustomPlatformData>(fontDescriptor.get());
}

RetainPtr<CFDictionaryRef> LegacyWebArchive::createPropertyListRepresentation(ArchiveResource* resource, MainResourceStatus isMainResource)
{
    if (!resource) {
        // The property list representation of a null/empty WebResource has the following 3 objects stored as nil.
        // FIXME: 0 is not serializable. Presumably we need to use kCFNull here instead for compatibility.
        // FIXME: But why do we need to support a resource of 0? Who relies on that?
        RetainPtr<CFMutableDictionaryRef> propertyList = adoptCF(CFDictionaryCreateMutable(0, 3, 0, 0));
        CFDictionarySetValue(propertyList.get(), LegacyWebArchiveResourceDataKey, 0);
        CFDictionarySetValue(propertyList.get(), LegacyWebArchiveResourceURLKey, 0);
        CFDictionarySetValue(propertyList.get(), LegacyWebArchiveResourceMIMETypeKey, 0);
        return propertyList;
    }
    
    RetainPtr<CFMutableDictionaryRef> propertyList = adoptCF(CFDictionaryCreateMutable(0, 6, 0, &kCFTypeDictionaryValueCallBacks));
    
    // Resource data can be empty, but must be represented by an empty CFDataRef
    SharedBuffer* data = resource->data();
    RetainPtr<CFDataRef> cfData;
    if (data)
        cfData = data->createCFData();
    else
        cfData = adoptCF(CFDataCreate(0, 0, 0));
    CFDictionarySetValue(propertyList.get(), LegacyWebArchiveResourceDataKey, cfData.get());
    
    // Resource URL cannot be null
    if (RetainPtr<CFStringRef> cfURL = resource->url().string().createCFString())
        CFDictionarySetValue(propertyList.get(), LegacyWebArchiveResourceURLKey, cfURL.get());
    else {
        LOG(Archives, "LegacyWebArchive - NULL resource URL is invalid - returning null property list");
        return 0;
    }

    // FrameName should be left out if empty for subresources, but always included for main resources
    const String& frameName(resource->frameName());
    if (!frameName.isEmpty() || isMainResource)
        CFDictionarySetValue(propertyList.get(), LegacyWebArchiveResourceFrameNameKey, frameName.createCFString().get());
    
    // Set MIMEType, TextEncodingName, and ResourceResponse only if they actually exist
    const String& mimeType(resource->mimeType());
    if (!mimeType.isEmpty())
        CFDictionarySetValue(propertyList.get(), LegacyWebArchiveResourceMIMETypeKey, mimeType.createCFString().get());
    
    const String& textEncoding(resource->textEncoding());
    if (!textEncoding.isEmpty())
        CFDictionarySetValue(propertyList.get(), LegacyWebArchiveResourceTextEncodingNameKey, textEncoding.createCFString().get());

    // Don't include the resource response for the main resource
    if (!isMainResource) {
        RetainPtr<CFDataRef> resourceResponseData = createPropertyListRepresentation(resource->response());
        if (resourceResponseData)
            CFDictionarySetValue(propertyList.get(), LegacyWebArchiveResourceResponseKey, resourceResponseData.get());    
    }
    
    return propertyList;
}

void ImageDecoder::setData(SharedBuffer& data, bool allDataReceived)
{
    m_isAllDataReceived = allDataReceived;

#if PLATFORM(COCOA)
    // On Mac the NSData inside the SharedBuffer can be secretly appended to without the SharedBuffer's knowledge.
    // We use SharedBuffer's ability to wrap itself inside CFData to get around this, ensuring that ImageIO is
    // really looking at the SharedBuffer.
    CGImageSourceUpdateData(m_nativeDecoder.get(), data.createCFData().get(), allDataReceived);
#else
    // Create a CGDataProvider to wrap the SharedBuffer.
    data.ref();
    // We use the GetBytesAtPosition callback rather than the GetBytePointer one because SharedBuffer
    // does not provide a way to lock down the byte pointer and guarantee that it won't move, which
    // is a requirement for using the GetBytePointer callback.
    CGDataProviderDirectCallbacks providerCallbacks = { 0, 0, 0, sharedBufferGetBytesAtPosition, sharedBufferRelease };
    RetainPtr<CGDataProviderRef> dataProvider = adoptCF(CGDataProviderCreateDirect(&data, data.size(), &providerCallbacks));
    CGImageSourceUpdateDataProvider(m_nativeDecoder.get(), dataProvider.get(), allDataReceived);
#endif
}

std::unique_ptr<FontCustomPlatformData> createFontCustomPlatformData(SharedBuffer& buffer)
{
    RetainPtr<CFDataRef> bufferData = buffer.createCFData();

#if CORETEXT_WEB_FONTS
    RetainPtr<CTFontDescriptorRef> fontDescriptor = adoptCF(CTFontManagerCreateFontDescriptorFromData(bufferData.get()));
    if (!fontDescriptor)
        return nullptr;

    return std::make_unique<FontCustomPlatformData>(fontDescriptor.get());

#else

    RetainPtr<CGDataProviderRef> dataProvider = adoptCF(CGDataProviderCreateWithCFData(bufferData.get()));

    RetainPtr<CGFontRef> cgFontRef = adoptCF(CGFontCreateWithDataProvider(dataProvider.get()));
    if (!cgFontRef)
        return nullptr;

    return std::make_unique<FontCustomPlatformData>(cgFontRef.get());
#endif
}

static RetainPtr<CFDictionaryRef> createPropertyListRepresentationFromResource(ArchiveResource* resource, bool mainResource)
{
    if (!resource) {
        // The property list representation of a null/empty WebResource has the following 3 objects stored as nil
        RetainPtr<CFMutableDictionaryRef> propertyList(AdoptCF, CFDictionaryCreateMutable(0, 3, 0, 0));
        CFDictionarySetValue(propertyList.get(), LegacyWebArchiveResourceDataKey, 0);
        CFDictionarySetValue(propertyList.get(), LegacyWebArchiveResourceURLKey, 0);
        CFDictionarySetValue(propertyList.get(), LegacyWebArchiveResourceMIMETypeKey, 0);

        return propertyList;
    }
    
    RetainPtr<CFMutableDictionaryRef> propertyList(AdoptCF, CFDictionaryCreateMutable(0, 6, 0, &kCFTypeDictionaryValueCallBacks));
    
    // Resource data can be empty, but must be represented by an empty CFDataRef
    SharedBuffer* data = resource->data();
    RetainPtr<CFDataRef> cfData;
    if (data)
        cfData.adoptCF(data->createCFData());
    else
        cfData.adoptCF(CFDataCreate(0, 0, 0));
    CFDictionarySetValue(propertyList.get(), LegacyWebArchiveResourceDataKey, cfData.get());
    
    // Resource URL cannot be null
    RetainPtr<CFStringRef> cfURL(AdoptCF, resource->url().string().createCFString());
    if (cfURL)
        CFDictionarySetValue(propertyList.get(), LegacyWebArchiveResourceURLKey, cfURL.get());
    else {
        LOG(Archives, "LegacyWebArchive - NULL resource URL is invalid - returning null property list");
        return 0;
    }

    // FrameName should be left out if empty for subresources, but always included for main resources
    const String& frameName(resource->frameName());
    if (!frameName.isEmpty() || mainResource) {
        RetainPtr<CFStringRef> cfFrameName(AdoptCF, frameName.createCFString());
        CFDictionarySetValue(propertyList.get(), LegacyWebArchiveResourceFrameNameKey, cfFrameName.get());
    }
    
    // Set MIMEType, TextEncodingName, and ResourceResponse only if they actually exist
    const String& mimeType(resource->mimeType());
    if (!mimeType.isEmpty()) {
        RetainPtr<CFStringRef> cfMIMEType(AdoptCF, mimeType.createCFString());
        CFDictionarySetValue(propertyList.get(), LegacyWebArchiveResourceMIMETypeKey, cfMIMEType.get());
    }
    
    const String& textEncoding(resource->textEncoding());
    if (!textEncoding.isEmpty()) {
        RetainPtr<CFStringRef> cfTextEncoding(AdoptCF, textEncoding.createCFString());
        CFDictionarySetValue(propertyList.get(), LegacyWebArchiveResourceTextEncodingNameKey, cfTextEncoding.get());
    }

    // Don't include the resource response for the main resource
    if (!mainResource) {
        RetainPtr<CFDataRef> resourceResponseData = propertyListDataFromResourceResponse(resource->response());
        if (resourceResponseData)
            CFDictionarySetValue(propertyList.get(), LegacyWebArchiveResourceResponseKey, resourceResponseData.get());    
    }
    
    return propertyList;
}