1 /* 2 * Copyright (C) 2009 Google Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are 6 * met: 7 * 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above 11 * copyright notice, this list of conditions and the following disclaimer 12 * in the documentation and/or other materials provided with the 13 * distribution. 14 * * Neither the name of Google Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived from 16 * this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #include "config.h" 32 #include "ArrayBuffer.h" 33 34 #include "ExceptionCode.h" 35 #include "V8Binding.h" 36 #include "V8ArrayBuffer.h" 37 #include "V8Proxy.h" 38 39 namespace WebCore { 40 41 v8::Handle<v8::Value> V8ArrayBuffer::constructorCallback(const v8::Arguments& args) 42 { 43 INC_STATS("DOM.ArrayBuffer.Constructor"); 44 45 if (!args.IsConstructCall()) 46 return throwError("DOM object constructor cannot be called as a function.", V8Proxy::SyntaxError); 47 48 // If we return a previously constructed ArrayBuffer, 49 // e.g. from the call to ArrayBufferView.buffer, this code is called 50 // with a zero-length argument list. The V8DOMWrapper will then 51 // set the internal pointer in the newly-created object. 52 // Unfortunately it doesn't look like it's possible to distinguish 53 // between this case and that where the user calls "new 54 // ArrayBuffer()" from JavaScript. To guard against problems, 55 // we always create at least a zero-length ArrayBuffer, even 56 // if it is immediately overwritten by the V8DOMWrapper. 57 58 // Supported constructors: 59 // ArrayBuffer(n) where n is an integer: 60 // -- create an empty buffer of n bytes 61 62 int argLength = args.Length(); 63 int length = 0; 64 if (argLength > 0) 65 length = toInt32(args[0]); // NaN/+inf/-inf returns 0, this is intended by WebIDL 66 RefPtr<ArrayBuffer> buffer; 67 if (length >= 0) 68 buffer = ArrayBuffer::create(static_cast<unsigned>(length), 1); 69 if (!buffer.get()) 70 return throwError("ArrayBuffer size is not a small enough positive integer.", V8Proxy::RangeError); 71 // Transform the holder into a wrapper object for the array. 72 V8DOMWrapper::setDOMWrapper(args.Holder(), &info, buffer.get()); 73 return toV8(buffer.release(), args.Holder()); 74 } 75 76 } // namespace WebCore 77
