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
39namespace WebCore {
40
41v8::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