EncodedJSValue JSC_HOST_CALL jsDataViewPrototypeFunctionSetFloat64(ExecState* exec)
{
JSValue thisValue = exec->hostThisValue();
if (!thisValue.inherits(&JSDataView::s_info))
return throwVMTypeError(exec);
JSDataView* castedThis = static_cast<JSDataView*>(asObject(thisValue));
ASSERT_GC_OBJECT_INHERITS(castedThis, &JSDataView::s_info);
DataView* imp = static_cast<DataView*>(castedThis->impl());
if (exec->argumentCount() < 2)
return throwVMError(exec, createSyntaxError(exec, "Not enough arguments"));
ExceptionCode ec = 0;
unsigned byteOffset(exec->argument(0).toUInt32(exec));
if (exec->hadException())
return JSValue::encode(jsUndefined());
double value(exec->argument(1).toNumber(exec));
if (exec->hadException())
return JSValue::encode(jsUndefined());
int argsCount = exec->argumentCount();
if (argsCount <= 2) {
imp->setFloat64(byteOffset, value, ec);
setDOMException(exec, ec);
return JSValue::encode(jsUndefined());
}
bool littleEndian(exec->argument(2).toBoolean(exec));
if (exec->hadException())
return JSValue::encode(jsUndefined());
imp->setFloat64(byteOffset, value, littleEndian, ec);
setDOMException(exec, ec);
return JSValue::encode(jsUndefined());
}
EncodedJSValue getData(ExecState* exec)
{
JSDataView* dataView = jsDynamicCast<JSDataView*>(exec->thisValue());
if (!dataView)
return throwVMError(exec, createTypeError(exec, "Receiver of DataView method must be a DataView"));
if (!exec->argumentCount())
return throwVMError(exec, createTypeError(exec, "Need at least one argument (the byteOffset)"));
unsigned byteOffset = exec->uncheckedArgument(0).toUInt32(exec);
if (exec->hadException())
return JSValue::encode(jsUndefined());
bool littleEndian = false;
unsigned elementSize = sizeof(typename Adaptor::Type);
if (elementSize > 1 && exec->argumentCount() >= 2) {
littleEndian = exec->uncheckedArgument(1).toBoolean(exec);
if (exec->hadException())
return JSValue::encode(jsUndefined());
}
unsigned byteLength = dataView->length();
if (elementSize > byteLength || byteOffset > byteLength - elementSize)
return throwVMError(exec, createRangeError(exec, "Out of bounds access"));
typename Adaptor::Type value = *reinterpret_cast<typename Adaptor::Type*>(static_cast<uint8_t*>(dataView->vector()) + byteOffset);
if (needToFlipBytesIfLittleEndian(littleEndian))
value = flipBytes(value);
return JSValue::encode(Adaptor::toJSValue(value));
}
EncodedJSValue JSC_HOST_CALL jsDataViewPrototypeFunctionSetUint8(ExecState* exec)
{
JSValue thisValue = exec->hostThisValue();
if (!thisValue.inherits(&JSDataView::s_info))
return throwVMTypeError(exec);
JSDataView* castedThis = static_cast<JSDataView*>(asObject(thisValue));
ASSERT_GC_OBJECT_INHERITS(castedThis, &JSDataView::s_info);
return JSValue::encode(castedThis->setUint8(exec));
}
EncodedJSValue JSC_HOST_CALL dataViewProtoGetterByteOffset(ExecState* exec)
{
VM& vm = exec->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
JSDataView* view = jsDynamicCast<JSDataView*>(exec->thisValue());
if (!view)
return throwVMTypeError(exec, scope, "DataView.prototype.buffer expects |this| to be a DataView object");
return JSValue::encode(jsNumber(view->byteOffset()));
}
bool JSDataView::getOwnPropertySlot(
JSObject* object, ExecState* exec, PropertyName propertyName, PropertySlot& slot)
{
JSDataView* thisObject = jsCast<JSDataView*>(object);
if (propertyName == exec->propertyNames().byteLength) {
slot.setValue(thisObject, DontEnum | ReadOnly, jsNumber(thisObject->m_length));
return true;
}
if (propertyName == exec->propertyNames().byteOffset) {
slot.setValue(thisObject, DontEnum | ReadOnly, jsNumber(thisObject->byteOffset()));
return true;
}
return Base::getOwnPropertySlot(thisObject, exec, propertyName, slot);
}
EncodedJSValue setData(ExecState* exec)
{
JSDataView* dataView = jsDynamicCast<JSDataView*>(exec->thisValue());
if (!dataView)
return throwVMError(exec, createTypeError(exec, "Receiver of DataView method must be a DataView"));
if (exec->argumentCount() < 2)
return throwVMError(exec, createTypeError(exec, "Need at least two argument (the byteOffset and value)"));
unsigned byteOffset = exec->uncheckedArgument(0).toUInt32(exec);
if (exec->hadException())
return JSValue::encode(jsUndefined());
const unsigned dataSize = sizeof(typename Adaptor::Type);
union {
typename Adaptor::Type value;
uint8_t rawBytes[dataSize];
} u;
u.value = toNativeFromValue<Adaptor>(exec, exec->uncheckedArgument(1));
if (exec->hadException())
return JSValue::encode(jsUndefined());
bool littleEndian = false;
unsigned elementSize = sizeof(typename Adaptor::Type);
if (elementSize > 1 && exec->argumentCount() >= 3) {
littleEndian = exec->uncheckedArgument(2).toBoolean(exec);
if (exec->hadException())
return JSValue::encode(jsUndefined());
}
unsigned byteLength = dataView->length();
if (elementSize > byteLength || byteOffset > byteLength - elementSize)
return throwVMError(exec, createRangeError(exec, "Out of bounds access"));
uint8_t* dataPtr = static_cast<uint8_t*>(dataView->vector()) + byteOffset;
if (needToFlipBytesIfLittleEndian(littleEndian)) {
for (unsigned i = dataSize; i--;)
*dataPtr++ = u.rawBytes[i];
} else {
for (unsigned i = 0; i < dataSize; i++)
*dataPtr++ = u.rawBytes[i];
}
return JSValue::encode(jsUndefined());
}
EncodedJSValue setData(ExecState* exec)
{
VM& vm = exec->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
JSDataView* dataView = jsDynamicCast<JSDataView*>(exec->thisValue());
if (!dataView)
return throwVMTypeError(exec, scope, ASCIILiteral("Receiver of DataView method must be a DataView"));
unsigned byteOffset = exec->argument(0).toIndex(exec, "byteOffset");
RETURN_IF_EXCEPTION(scope, encodedJSValue());
const unsigned dataSize = sizeof(typename Adaptor::Type);
union {
typename Adaptor::Type value;
uint8_t rawBytes[dataSize];
} u;
u.value = toNativeFromValue<Adaptor>(exec, exec->argument(1));
RETURN_IF_EXCEPTION(scope, encodedJSValue());
bool littleEndian = false;
unsigned elementSize = sizeof(typename Adaptor::Type);
if (elementSize > 1 && exec->argumentCount() >= 3) {
littleEndian = exec->uncheckedArgument(2).toBoolean(exec);
RETURN_IF_EXCEPTION(scope, encodedJSValue());
}
unsigned byteLength = dataView->length();
if (elementSize > byteLength || byteOffset > byteLength - elementSize)
return throwVMError(exec, scope, createRangeError(exec, ASCIILiteral("Out of bounds access")));
uint8_t* dataPtr = static_cast<uint8_t*>(dataView->vector()) + byteOffset;
if (needToFlipBytesIfLittleEndian(littleEndian)) {
for (unsigned i = dataSize; i--;)
*dataPtr++ = u.rawBytes[i];
} else {
for (unsigned i = 0; i < dataSize; i++)
*dataPtr++ = u.rawBytes[i];
}
return JSValue::encode(jsUndefined());
}
JSDataView* JSDataView::create(
ExecState* exec, Structure* structure, PassRefPtr<ArrayBuffer> passedBuffer,
unsigned byteOffset, unsigned byteLength)
{
RefPtr<ArrayBuffer> buffer = passedBuffer;
if (!ArrayBufferView::verifySubRange<uint8_t>(buffer, byteOffset, byteLength)) {
throwVMError(
exec, createRangeError(exec, "Byte offset and length out of range of buffer"));
return 0;
}
VM& vm = exec->vm();
ConstructionContext context(
structure, buffer, byteOffset, byteLength, ConstructionContext::DataView);
ASSERT(context);
JSDataView* result =
new (NotNull, allocateCell<JSDataView>(vm.heap)) JSDataView(vm, context, buffer.get());
result->finishCreation(vm);
return result;
}
JSDataView* JSDataView::create(
ExecState* exec, Structure* structure, PassRefPtr<ArrayBuffer> passedBuffer,
unsigned byteOffset, unsigned byteLength)
{
RefPtr<ArrayBuffer> buffer = passedBuffer;
if (!ArrayBufferView::verifySubRangeLength(buffer, byteOffset, byteLength, sizeof(uint8_t))) {
throwVMError(exec, createRangeError(exec, ASCIILiteral("Length out of range of buffer")));
return nullptr;
}
if (!ArrayBufferView::verifyByteOffsetAlignment(byteOffset, sizeof(uint8_t))) {
exec->vm().throwException(exec, createRangeError(exec, ASCIILiteral("Byte offset is not aligned")));
return nullptr;
}
VM& vm = exec->vm();
ConstructionContext context(
structure, buffer, byteOffset, byteLength, ConstructionContext::DataView);
ASSERT(context);
JSDataView* result =
new (NotNull, allocateCell<JSDataView>(vm.heap)) JSDataView(vm, context, buffer.get());
result->finishCreation(vm);
return result;
}
PassRefPtr<ArrayBufferView> JSDataView::getTypedArrayImpl(JSArrayBufferView* object)
{
JSDataView* thisObject = jsCast<JSDataView*>(object);
return thisObject->typedImpl();
}
JSValue jsDataViewConstructor(ExecState* exec, JSValue slotBase, const Identifier&)
{
JSDataView* domObject = static_cast<JSDataView*>(asObject(slotBase));
return JSDataView::getConstructor(exec, domObject->globalObject());
}
