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/*
* 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 "V8ArrayBufferCustom.h"
#include <wtf/ArrayBuffer.h>
#include <wtf/StdLibExtras.h>
#include "ExceptionCode.h"
#include "V8ArrayBuffer.h"
#include "V8Binding.h"
namespace WebCore {
V8ArrayBufferDeallocationObserver* V8ArrayBufferDeallocationObserver::instance()
{
DEFINE_STATIC_LOCAL(V8ArrayBufferDeallocationObserver, deallocationObserver, ());
return &deallocationObserver;
}
v8::Handle<v8::Value> V8ArrayBuffer::constructorCallbackCustom(const v8::Arguments& args)
{
// 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(v8RangeError, "ArrayBuffer size is not a small enough positive integer.", args.GetIsolate());
buffer->setDeallocationObserver(V8ArrayBufferDeallocationObserver::instance());
v8::V8::AdjustAmountOfExternalAllocatedMemory(buffer->byteLength());
// Transform the holder into a wrapper object for the array.
v8::Handle<v8::Object> wrapper = args.Holder();
V8DOMWrapper::createDOMWrapper(buffer.release(), &info, wrapper);
return wrapper;
}
} // namespace WebCore
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