/* * Copyright (C) 2009 Google Inc. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are * met: * * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following disclaimer * in the documentation and/or other materials provided with the * distribution. * * Neither the name of Google Inc. nor the names of its * contributors may be used to endorse or promote products derived from * this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include "config.h" #include <wtf/ArrayBuffer.h> #include "ExceptionCode.h" #include "V8Binding.h" #include "V8ArrayBuffer.h" #include "V8Proxy.h" namespace WebCore { v8::Handle<v8::Value> V8ArrayBuffer::constructorCallback(const v8::Arguments& args) { INC_STATS("DOM.ArrayBuffer.Constructor"); if (!args.IsConstructCall()) return throwError("DOM object constructor cannot be called as a function.", V8Proxy::TypeError); if (ConstructorMode::current() == ConstructorMode::WrapExistingObject) return args.Holder(); // If we return a previously constructed ArrayBuffer, // e.g. from the call to ArrayBufferView.buffer, this code is called // with a zero-length argument list. The V8DOMWrapper will then // set the internal pointer in the newly-created object. // Unfortunately it doesn't look like it's possible to distinguish // between this case and that where the user calls "new // ArrayBuffer()" from JavaScript. To guard against problems, // we always create at least a zero-length ArrayBuffer, even // if it is immediately overwritten by the V8DOMWrapper. // Supported constructors: // ArrayBuffer(n) where n is an integer: // -- create an empty buffer of n bytes int argLength = args.Length(); int length = 0; if (argLength > 0) length = toInt32(args[0]); // NaN/+inf/-inf returns 0, this is intended by WebIDL RefPtr<ArrayBuffer> buffer; if (length >= 0) buffer = ArrayBuffer::create(static_cast<unsigned>(length), 1); if (!buffer.get()) return throwError("ArrayBuffer size is not a small enough positive integer.", V8Proxy::RangeError); // Transform the holder into a wrapper object for the array. V8DOMWrapper::setDOMWrapper(args.Holder(), &info, buffer.get()); V8DOMWrapper::setJSWrapperForDOMObject(buffer.release(), v8::Persistent<v8::Object>::New(args.Holder())); return args.Holder(); } } // namespace WebCore