void TypedArray (const Wrapper* wrapper, Handle<Value> value, vector<void*>& natives) {
void *buff = NULL;
size_t byteLength = 0;
if (value->IsObject()) {
Handle<Object> obj = value->ToObject();
if (obj->HasIndexedPropertiesInExternalArrayData()) {
buff = obj->GetIndexedPropertiesExternalArrayData();
byteLength = obj->GetIndexedPropertiesExternalArrayDataLength();
switch (obj->GetIndexedPropertiesExternalArrayDataType()) {
case kExternalByteArray:
case kExternalUnsignedByteArray:
case kExternalPixelArray:
break;
case kExternalShortArray:
case kExternalUnsignedShortArray:
byteLength *= 2;
break;
case kExternalIntArray:
case kExternalUnsignedIntArray:
case kExternalFloatArray:
byteLength *= 4;
break;
case kExternalDoubleArray:
byteLength *= 8;
break;
}
} else {
buff = Get<void*>(value);
}
}
PushBackWrapped(natives, buff);
PushBackWrapped(natives, byteLength);
}
Handle<Value> CreateExternalArray(const Arguments& args,
ExternalArrayType type,
size_t element_size) {
TryCatch try_catch;
ASSERT_PIN(element_size == 1 || element_size == 2 ||
element_size == 4 || element_size == 8, "CreateExternalArray");
// Currently, only the following constructors are supported:
// TypedArray(unsigned long length)
// TypedArray(ArrayBuffer buffer,
// optional unsigned long byteOffset,
// optional unsigned long length)
Handle<Object> buffer;
int32_t length;
int32_t byteLength;
int32_t byteOffset;
int32_t bufferLength;
if (args.Length() == 0) {
return ThrowException(
String::New("Array constructor must have at least one parameter."));
}
if (args[0]->IsObject() &&
(!args[0]->ToObject()->GetHiddenValue(String::New(kArrayBufferMarkerPropName)).IsEmpty()) ||
(IS_BINARY(args[0]))) {
if (!args[0]->ToObject()->GetHiddenValue(String::New(kArrayBufferMarkerPropName)).IsEmpty()) {
buffer = args[0]->ToObject();
bufferLength = convertToUint(buffer->Get(String::New("byteLength")), &try_catch);
if (try_catch.HasCaught())
return try_catch.Exception();
} else {
buffer = CreateExternalArrayBuffer(args[0])->ToObject();
bufferLength = convertToUint(buffer->Get(String::New("byteLength")), &try_catch);
if (try_catch.HasCaught())
return try_catch.Exception();
}
if (args.Length() < 2 || args[1]->IsUndefined()) {
byteOffset = 0;
} else {
byteOffset = convertToUint(args[1], &try_catch);
if (try_catch.HasCaught()) return try_catch.Exception();
if (byteOffset > bufferLength) {
return ThrowException(String::New("byteOffset out of bounds"));
}
if (byteOffset % element_size != 0) {
return ThrowException(
String::New("byteOffset must be multiple of element_size"));
}
}
if (args.Length() < 3 || args[2]->IsUndefined()) {
byteLength = bufferLength - byteOffset;
length = byteLength / element_size;
if (byteLength % element_size != 0) {
return ThrowException(
String::New("buffer size must be multiple of element_size"));
}
} else {
length = convertToUint(args[2], &try_catch);
if (try_catch.HasCaught())
return try_catch.Exception();
byteLength = length * element_size;
if (byteOffset + byteLength > bufferLength) {
return ThrowException(String::New("length out of bounds"));
}
}
} else {
length = convertToUint(args[0], &try_catch);
byteLength = length * element_size;
byteOffset = 0;
Handle<Value> result = CreateExternalArrayBuffer(byteLength);
if (!result->IsObject())
return result;
buffer = result->ToObject();
}
void* data = buffer->GetIndexedPropertiesExternalArrayData();
ASSERT_PIN(data != NULL, "CreateExternalArray data != NULL");
Handle<Object> array = Object::New();
array->SetIndexedPropertiesToExternalArrayData(
static_cast<uint8_t*>(data) + byteOffset, type, length);
array->Set(String::New("byteLength"), Int32::New(byteLength), ReadOnly);
array->Set(String::New("byteOffset"), Int32::New(byteOffset), ReadOnly);
array->Set(String::New("length"), Int32::New(length), ReadOnly);
array->Set(String::New("BYTES_PER_ELEMENT"), Int32::New(element_size));
array->Set(String::New("buffer"), buffer, ReadOnly);
return array;
}