private static ArrayRange <RenderTreeFrame> ReadReferenceFrames(ReadOnlySpan <byte> data, string[] strings)
{
var result = new RenderTreeFrame[data.Length / ReferenceFrameSize];
for (var i = 0; i < data.Length; i += ReferenceFrameSize)
{
var frameData = data.Slice(i, ReferenceFrameSize);
var type = (RenderTreeFrameType)BitConverter.ToInt32(frameData.Slice(0, 4));
// We want each frame to take up the same number of bytes, so that the
// recipient can index into the array directly instead of having to
// walk through it.
// Since we can fit every frame type into 16 bytes, use that as the
// common size. For smaller frames, we add padding to expand it to
// 16 bytes.
switch (type)
{
case RenderTreeFrameType.Attribute:
var attributeName = ReadString(frameData.Slice(4, 4), strings);
var attributeValue = ReadString(frameData.Slice(8, 4), strings);
var attributeEventHandlerId = BitConverter.ToUInt64(frameData.Slice(12, 8));
result[i / ReferenceFrameSize] = RenderTreeFrame.Attribute(0, attributeName, attributeValue).WithAttributeEventHandlerId(attributeEventHandlerId);
break;
case RenderTreeFrameType.Component:
var componentSubtreeLength = BitConverter.ToInt32(frameData.Slice(4, 4));
var componentId = BitConverter.ToInt32(frameData.Slice(8, 4)); // Nowhere to put this without creating a ComponentState
result[i / ReferenceFrameSize] = RenderTreeFrame.ChildComponent(0, componentType: null)
.WithComponentSubtreeLength(componentSubtreeLength)
.WithComponent(new ComponentState(Renderer, componentId, new FakeComponent(), null));
break;
case RenderTreeFrameType.ComponentReferenceCapture:
// Client doesn't process these, skip.
result[i / ReferenceFrameSize] = RenderTreeFrame.ComponentReferenceCapture(0, null, 0);
break;
case RenderTreeFrameType.Element:
var elementSubtreeLength = BitConverter.ToInt32(frameData.Slice(4, 4));
var elementName = ReadString(frameData.Slice(8, 4), strings);
result[i / ReferenceFrameSize] = RenderTreeFrame.Element(0, elementName).WithElementSubtreeLength(elementSubtreeLength);
break;
case RenderTreeFrameType.ElementReferenceCapture:
var referenceCaptureId = ReadString(frameData.Slice(4, 4), strings);
result[i / ReferenceFrameSize] = RenderTreeFrame.ElementReferenceCapture(0, null)
.WithElementReferenceCaptureId(referenceCaptureId);
break;
case RenderTreeFrameType.Region:
var regionSubtreeLength = BitConverter.ToInt32(frameData.Slice(4, 4));
result[i / ReferenceFrameSize] = RenderTreeFrame.Region(0).WithRegionSubtreeLength(regionSubtreeLength);
break;
case RenderTreeFrameType.Text:
var text = ReadString(frameData.Slice(4, 4), strings);
result[i / ReferenceFrameSize] = RenderTreeFrame.Text(0, text);
break;
case RenderTreeFrameType.Markup:
var markup = ReadString(frameData.Slice(4, 4), strings);
result[i / ReferenceFrameSize] = RenderTreeFrame.Markup(0, markup);
break;
default:
throw new ArgumentException($"Unsupported frame type: {type}");
}
}
return(new ArrayRange <RenderTreeFrame>(result, result.Length));
}