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32 #include "ArrayBuffer.h"
34 #include "ExceptionCode.h"
35 #include "V8Binding.h"
36 #include "V8ArrayBuffer.h"
41 v8::Handle<v8::Value> V8ArrayBuffer::constructorCallback(const v8::Arguments& args)
43 INC_STATS("DOM.ArrayBuffer.Constructor");
45 if (!args.IsConstructCall())
46 return throwError("DOM object constructor cannot be called as a function.", V8Proxy::TypeError);
48 if (ConstructorMode::current() == ConstructorMode::WrapExistingObject)
51 // If we return a previously constructed ArrayBuffer,
52 // e.g. from the call to ArrayBufferView.buffer, this code is called
53 // with a zero-length argument list. The V8DOMWrapper will then
54 // set the internal pointer in the newly-created object.
55 // Unfortunately it doesn't look like it's possible to distinguish
56 // between this case and that where the user calls "new
57 // ArrayBuffer()" from JavaScript. To guard against problems,
58 // we always create at least a zero-length ArrayBuffer, even
59 // if it is immediately overwritten by the V8DOMWrapper.
61 // Supported constructors:
62 // ArrayBuffer(n) where n is an integer:
63 // -- create an empty buffer of n bytes
65 int argLength = args.Length();
68 length = toInt32(args[0]); // NaN/+inf/-inf returns 0, this is intended by WebIDL
69 RefPtr<ArrayBuffer> buffer;
71 buffer = ArrayBuffer::create(static_cast<unsigned>(length), 1);
73 return throwError("ArrayBuffer size is not a small enough positive integer.", V8Proxy::RangeError);
74 // Transform the holder into a wrapper object for the array.
75 V8DOMWrapper::setDOMWrapper(args.Holder(), &info, buffer.get());
76 return toV8(buffer.release(), args.Holder());
79 } // namespace WebCore