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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: set ts=8 sts=2 et sw=2 tw=80:
* 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/. */
#ifndef builtin_streams_ReadableStreamReader_inl_h
#define builtin_streams_ReadableStreamReader_inl_h
#include "builtin/streams/ReadableStreamReader.h"
#include "mozilla/Assertions.h" // MOZ_ASSERT
#include "mozilla/Attributes.h" // MOZ_MUST_USE
#include "jsfriendapi.h" // JS_IsDeadWrapper
#include "builtin/streams/ReadableStream.h" // js::ReadableStream
#include "js/Proxy.h" // js::IsProxy
#include "js/RootingAPI.h" // JS::Handle
#include "vm/NativeObject.h" // js::NativeObject::getFixedSlot
#include "vm/Compartment-inl.h" // js::UnwrapInternalSlot
namespace js {
/**
* Returns the stream associated with the given reader.
*/
inline MOZ_MUST_USE ReadableStream* UnwrapStreamFromReader(
JSContext* cx, JS::Handle<ReadableStreamReader*> reader) {
MOZ_ASSERT(reader->hasStream());
return UnwrapInternalSlot<ReadableStream>(cx, reader,
ReadableStreamReader::Slot_Stream);
}
/**
* Returns the reader associated with the given stream.
*
* Must only be called on ReadableStreams that already have a reader
* associated with them.
*
* If the reader is a wrapper, it will be unwrapped, so the result might not be
* an object from the currently active compartment.
*/
inline MOZ_MUST_USE ReadableStreamReader* UnwrapReaderFromStream(
JSContext* cx, JS::Handle<ReadableStream*> stream) {
return UnwrapInternalSlot<ReadableStreamReader>(cx, stream,
ReadableStream::Slot_Reader);
}
inline MOZ_MUST_USE ReadableStreamReader* UnwrapReaderFromStreamNoThrow(
ReadableStream* stream) {
JSObject* readerObj =
&stream->getFixedSlot(ReadableStream::Slot_Reader).toObject();
if (IsProxy(readerObj)) {
if (JS_IsDeadWrapper(readerObj)) {
return nullptr;
}
readerObj = readerObj->maybeUnwrapAs<ReadableStreamReader>();
if (!readerObj) {
return nullptr;
}
}
return &readerObj->as<ReadableStreamReader>();
}
} // namespace js
#endif // builtin_streams_ReadableStreamReader_inl_h
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