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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use dom_struct::dom_struct;
use js::gc::CustomAutoRooterGuard;
use js::jsapi::Heap;
use js::typedarray::{ArrayBufferView, ArrayBufferViewU8};
use super::bindings::buffer_source::{BufferSource, HeapBufferSource};
use crate::dom::bindings::codegen::Bindings::ReadableStreamBYOBRequestBinding::ReadableStreamBYOBRequestMethods;
use crate::dom::bindings::import::module::{Error, Fallible};
use crate::dom::bindings::reflector::Reflector;
use crate::dom::bindings::root::MutNullableDom;
use crate::dom::readablebytestreamcontroller::ReadableByteStreamController;
use crate::dom::types::GlobalScope;
use crate::script_runtime::JSContext as SafeJSContext;
/// <https://streams.spec.whatwg.org/#readablestreambyobrequest>
#[dom_struct]
pub(crate) struct ReadableStreamBYOBRequest {
reflector_: Reflector,
controller: MutNullableDom<ReadableByteStreamController>,
#[ignore_malloc_size_of = "mozjs"]
view: HeapBufferSource<ArrayBufferViewU8>,
}
impl ReadableStreamBYOBRequestMethods<crate::DomTypeHolder> for ReadableStreamBYOBRequest {
/// <https://streams.spec.whatwg.org/#rs-byob-request-view>
fn GetView(&self, _cx: SafeJSContext) -> Option<js::typedarray::ArrayBufferView> {
// Return this.[[view]].
self.view.buffer_to_option()
}
/// <https://streams.spec.whatwg.org/#rs-byob-request-respond>
fn Respond(&self, bytes_written: u64) -> Fallible<()> {
let cx = GlobalScope::get_cx();
// If this.[[controller]] is undefined, throw a TypeError exception.
let controller = if let Some(controller) = self.controller.get() {
controller
} else {
return Err(Error::Type("controller is undefined".to_owned()));
};
// If ! IsDetachedBuffer(this.[[view]].[[ArrayBuffer]]) is true, throw a TypeError exception.
if self.view.is_detached_buffer(cx) {
return Err(Error::Type("buffer is detached".to_owned()));
}
// Assert: this.[[view]].[[ByteLength]] > 0.
assert!(self.view.byte_length() > 0);
// Assert: this.[[view]].[[ViewedArrayBuffer]].[[ByteLength]] > 0.
assert!(self.view.viewed_buffer_array_byte_length(cx) > 0);
// Perform ? ReadableByteStreamControllerRespond(this.[[controller]], bytesWritten).
controller.respond(bytes_written)
}
/// <https://streams.spec.whatwg.org/#rs-byob-request-respond-with-new-view>
#[allow(unsafe_code)]
fn RespondWithNewView(&self, view: CustomAutoRooterGuard<ArrayBufferView>) -> Fallible<()> {
let view = HeapBufferSource::<ArrayBufferViewU8>::new(BufferSource::ArrayBufferView(
Heap::boxed(unsafe { *view.underlying_object() }),
));
// If this.[[controller]] is undefined, throw a TypeError exception.
let controller = if let Some(controller) = self.controller.get() {
controller
} else {
return Err(Error::Type("controller is undefined".to_owned()));
};
// If ! IsDetachedBuffer(view.[[ViewedArrayBuffer]]) is true, throw a TypeError exception.
if self.view.is_detached_buffer(GlobalScope::get_cx()) {
return Err(Error::Type("buffer is detached".to_owned()));
}
// Return ? ReadableByteStreamControllerRespondWithNewView(this.[[controller]], view).
controller.respond_with_new_view(view)
}
}
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