internal static JSDataView CreateFromJS(JavaScriptValue value, IntPtr handle, uint size, IContextSwitchService context)
{
JSDataView result = new JSDataView(SharedBufferSourceEnum.CreateByJavascript, null, 0, size);
result.SetJSSource(value, context);
result.InitWindow(handle, false);
return(result);
}
public static JSDataView CreateFromArrayBuffer(JSArrayBuffer source, uint position, uint size, Action <SharedMemoryBuffer> init)
{
JSDataView result;
if (source.Buffer == null)
{
result = new JSDataView(SharedBufferSourceEnum.CreateInJavascript, source, position, size);
}
else
{
result = new JSDataView(SharedBufferSourceEnum.CreateByDotnet, source, position, size);
result.InitWindow(source.Buffer, position);
}
if (init != null)
{
result.SetupInitValueAction(init);
}
return(result);
}
/// <summary>
/// Create DataView in javascript
/// this method requires a sourceArrayBuffer which make sure the arraybuffer is initialized before transfer to javascript
/// </summary>
/// <param name="sourceArrayBuffer">ArrayBuffer object</param>
/// <param name="source"></param>
/// <returns></returns>
public static JavaScriptValue CreateDataView(this IJSValueService valueService, JavaScriptValue sourceArrayBuffer, JSDataView source)
{
IContextSwitchService switchService = valueService.CurrentNode.GetService <IRuntimeService>().InternalContextSwitchService;
if (source.JSSource.IsValid)
{
return(source.JSSource);
}
switch (source.BufferSource)
{
case SharedBufferSourceEnum.CreateByDotnet:
return(switchService.With <JavaScriptValue>(
() =>
{
var result = JavaScriptValue.CreateDataView(sourceArrayBuffer, source.Position, (uint)source.Size);
source.SetJSSource(result, switchService);
source.InitBeforeConvert(source.Buffer);
return result;
}
));
case SharedBufferSourceEnum.CreateByJavascript:
throw new InvalidOperationException("invalid source typed array"); //create by javascript should already have JavaScriptValue assigned
case SharedBufferSourceEnum.CreateInJavascript:
return(switchService.With <JavaScriptValue>(
() =>
{
var result = JavaScriptValue.CreateDataView(sourceArrayBuffer, source.Position, (uint)source.Size);
source.SetJSSource(result, switchService);
JavaScriptValue.GetDataViewStorage(result, out IntPtr data, out uint bufferLength);
source.InitWindow(data, false);
source.InitBeforeConvert(source.Buffer);
return result;
}
));
case SharedBufferSourceEnum.CreateByExternal:
throw new ArgumentException("DataView does not support create from external");
default:
throw new ArgumentOutOfRangeException("Invalid BufferSource property in JSDataView object");
}
}
