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/*
* Copyright (C) 2010 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:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS 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 APPLE OR ITS 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 "JSDataView.h"
#include "DataView.h"
#include "ExceptionCode.h"
#include "JSArrayBufferViewHelper.h"
#include <wtf/MathExtras.h>
using namespace JSC;
namespace WebCore {
enum DataViewAccessType {
AccessDataViewMemberAsFloat32,
AccessDataViewMemberAsFloat64
};
JSValue toJS(ExecState* exec, JSDOMGlobalObject* globalObject, DataView* object)
{
return wrap<JSDataView>(exec, globalObject, object);
}
EncodedJSValue JSC_HOST_CALL JSDataViewConstructor::constructJSDataView(ExecState* exec)
{
if (exec->argument(0).isNull() || !exec->argument(0).isObject())
return throwVMTypeError(exec);
RefPtr<DataView> view = constructArrayBufferViewWithArrayBufferArgument<DataView, char>(exec);
if (!view.get()) {
setDOMException(exec, INDEX_SIZE_ERR);
return JSValue::encode(jsUndefined());
}
JSDataViewConstructor* jsConstructor = jsCast<JSDataViewConstructor*>(exec->callee());
return JSValue::encode(asObject(toJS(exec, jsConstructor->globalObject(), view.get())));
}
static JSValue getDataViewMember(ExecState* exec, DataView* imp, DataViewAccessType type)
{
if (exec->argumentCount() < 1)
return throwError(exec, createNotEnoughArgumentsError(exec));
ExceptionCode ec = 0;
unsigned byteOffset = exec->argument(0).toUInt32(exec);
if (exec->hadException())
return jsUndefined();
bool littleEndian = false;
if (exec->argumentCount() > 1 && (type == AccessDataViewMemberAsFloat32 || type == AccessDataViewMemberAsFloat64)) {
littleEndian = exec->argument(1).toBoolean(exec);
if (exec->hadException())
return jsUndefined();
}
JSC::JSValue result;
switch (type) {
case AccessDataViewMemberAsFloat32:
case AccessDataViewMemberAsFloat64: {
double value = (type == AccessDataViewMemberAsFloat32) ? imp->getFloat32(byteOffset, littleEndian, ec) : imp->getFloat64(byteOffset, littleEndian, ec);
result = std::isnan(value) ? jsNaN() : jsNumber(value);
break;
} default:
ASSERT_NOT_REACHED();
break;
}
setDOMException(exec, ec);
return result;
}
JSValue JSDataView::getFloat32(ExecState* exec)
{
return getDataViewMember(exec, static_cast<DataView*>(impl()), AccessDataViewMemberAsFloat32);
}
JSValue JSDataView::getFloat64(ExecState* exec)
{
return getDataViewMember(exec, static_cast<DataView*>(impl()), AccessDataViewMemberAsFloat64);
}
} // namespace WebCore
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