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 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());
}
