private static ScriptValue GetLength([NotNull] ScriptArguments arg)
{
//https://tc39.github.io/ecma262/#sec-get-%typedarray%.prototype.length
var obj = arg.ThisValue;
if (!obj.IsObject)
{
throw arg.Agent.CreateTypeError();
}
var realObject = (ScriptObject)obj;
if (!(realObject is ScriptIntegerIndexedObject))
{
throw arg.Agent.CreateTypeError();
}
var buffer = ((ScriptIntegerIndexedObject)realObject).ViewedArrayBuffer;
if (ArrayBufferIntrinsics.IsDetachedBuffer(buffer))
{
return(0);
}
return(((ScriptIntegerIndexedObject)realObject).ArrayLength);
}
private static ScriptValue DataView([NotNull] ScriptArguments arg)
{
//https://tc39.github.io/ecma262/#sec-dataview-buffer-byteoffset-bytelength
if (arg.NewTarget == null)
{
throw arg.Agent.CreateTypeError();
}
var buffer = arg[0].AsObject(arg.Agent);
if (buffer.SpecialObjectType != SpecialObjectType.ArrayBuffer)
{
throw arg.Agent.CreateTypeError();
}
var offset = arg.Agent.ToIndex(arg[1]);
if (ArrayBufferIntrinsics.IsDetachedBuffer(buffer))
{
throw arg.Agent.CreateTypeError();
}
var bufferByteLength = buffer.ArrayBuffer.Data.LongLength;
if (offset > bufferByteLength)
{
throw arg.Agent.CreateRangeError();
}
long viewByteLength;
if (arg[2] == ScriptValue.Undefined)
{
viewByteLength = bufferByteLength - offset;
}
else
{
viewByteLength = arg.Agent.ToIndex(arg[2]);
if (offset + viewByteLength > bufferByteLength)
{
throw arg.Agent.CreateRangeError();
}
}
var obj = arg.Agent.OrdinaryCreateFromConstructor(arg.NewTarget, arg.Function.Realm.DataViewPrototype, SpecialObjectType.DataView);
obj.DataView.ViewedArrayBuffer = buffer;
obj.DataView.ByteLength = viewByteLength;
obj.DataView.ByteOffset = offset;
return(obj);
}
