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
constructorCallback(const v8::Arguments & args)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