/// <summary>
/// Create a ArrayBuffer from a pointer to an pre-allocated memory cache, the memory will not be released when the JSArrayBuffer is disposed
/// </summary>
/// <param name="handle">pointer to memory cache</param>
/// <param name="size">arraybuffer size in bytes</param>
/// <returns></returns>
public static JSArrayBuffer CreateFromExternal(IntPtr handle, ulong size)
{
var result = new JSArrayBuffer(SharedBufferSourceEnum.CreateByExternal, size);
result.InitWindow(handle, false);
return(result);
}
internal static JSArrayBuffer CreateFromJS(IntPtr handle, uint size, JavaScriptValue value, IContextSwitchService context)
{
var result = new JSArrayBuffer(SharedBufferSourceEnum.CreateByJavascript, (ulong)size);
result.SetJSSource(value, context);
result.InitWindow(handle, false); //memory owned by js, do not release when object is disposed
return(result);
}
public static JavaScriptValue CreateArrayBuffer(this IJSValueService valueService, JSArrayBuffer source)
{
IContextSwitchService switchService = valueService.CurrentNode.GetService <IRuntimeService>().InternalContextSwitchService;
return(switchService.With <JavaScriptValue>(() =>
{
if (source.JSSource.IsValid)
{
return source.JSSource;
}
switch (source.BufferSource)
{
case SharedBufferSourceEnum.CreateByJavascript:
throw new InvalidOperationException("invalid source array buffer"); //create by javascript should already have JavaScriptValue assigned
case SharedBufferSourceEnum.CreateInJavascript:
{
JavaScriptValue result = JavaScriptValue.CreateArrayBuffer((uint)source.Size);
source.SetJSSource(result, switchService); //hold the varient
var data = JavaScriptValue.GetArrayBufferStorage(result, out uint bufferSize);
source.InitWindow(data, false);
source.InitBeforeConvert(source.Buffer);
return result;
}
case SharedBufferSourceEnum.CreateByDotnet:
case SharedBufferSourceEnum.CreateByExternal:
{
var result = JavaScriptValue.CreateExternalArrayBuffer(source.Buffer.Handle, (uint)source.Buffer.ByteLength, null, IntPtr.Zero); //do not handle GC callback, user should control the varient life cycle
source.SetJSSource(result, switchService); //hold the varient
return result;
}
default:
throw new ArgumentOutOfRangeException("Invalid BufferSource property in JSArryBuffer object");
}
}
));
}