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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* 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
#include "mozilla/dom/DecompressionStream.h"
#include "BaseAlgorithms.h"
#include "FormatZlib.h"
#include "FormatZstd.h"
#include "js/TypeDecls.h"
#include "mozilla/StaticPrefs_dom.h"
#include "mozilla/dom/DecompressionStreamBinding.h"
#include "mozilla/dom/ReadableStream.h"
#include "mozilla/dom/TextDecoderStream.h"
#include "mozilla/dom/TransformStream.h"
#include "mozilla/dom/UnionTypes.h"
#include "mozilla/dom/WritableStream.h"
namespace mozilla::dom {
using namespace compression;
/*
* Constructs either a ZLibDecompressionStreamAlgorithms or a
* ZstdDecompressionStreamAlgorithms, based on the CompressionFormat.
*/
static Result<already_AddRefed<DecompressionStreamAlgorithms>, nsresult>
CreateDecompressionStreamAlgorithms(CompressionFormat aFormat) {
if (aFormat == CompressionFormat::Zstd) {
RefPtr<DecompressionStreamAlgorithms> zstdAlgos =
MOZ_TRY(ZstdDecompressionStreamAlgorithms::Create());
return zstdAlgos.forget();
}
RefPtr<DecompressionStreamAlgorithms> zlibAlgos =
MOZ_TRY(ZLibDecompressionStreamAlgorithms::Create(aFormat));
return zlibAlgos.forget();
}
NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(DecompressionStream, mGlobal, mStream)
NS_IMPL_CYCLE_COLLECTING_ADDREF(DecompressionStream)
NS_IMPL_CYCLE_COLLECTING_RELEASE(DecompressionStream)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(DecompressionStream)
NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END
DecompressionStream::DecompressionStream(nsISupports* aGlobal,
TransformStream& aStream)
: mGlobal(aGlobal), mStream(&aStream) {}
DecompressionStream::~DecompressionStream() = default;
JSObject* DecompressionStream::WrapObject(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) {
return DecompressionStream_Binding::Wrap(aCx, this, aGivenProto);
}
already_AddRefed<DecompressionStream> DecompressionStream::Constructor(
const GlobalObject& aGlobal, CompressionFormat aFormat, ErrorResult& aRv) {
if (aFormat == CompressionFormat::Zstd &&
aGlobal.CallerType() != CallerType::System &&
!StaticPrefs::dom_compression_streams_zstd_enabled()) {
aRv.ThrowTypeError(
"'zstd' (value of argument 1) is not a valid value for enumeration "
"CompressionFormat.");
return nullptr;
}
// Step 1: If format is unsupported in DecompressionStream, then throw a
// TypeError.
// XXX: Skipped as we are using enum for this
// Step 2 - 4: (Done in {ZLib|Zstd}DecompressionStreamAlgorithms)
// Step 5: Set this's transform to a new TransformStream.
// Step 6: Set up this's transform with transformAlgorithm set to
// transformAlgorithm and flushAlgorithm set to flushAlgorithm.
Result<already_AddRefed<DecompressionStreamAlgorithms>, nsresult> algorithms =
CreateDecompressionStreamAlgorithms(aFormat);
if (algorithms.isErr()) {
aRv.ThrowUnknownError("Not enough memory");
return nullptr;
}
RefPtr<DecompressionStreamAlgorithms> alg = algorithms.unwrap();
RefPtr<TransformStream> stream =
TransformStream::CreateGeneric(aGlobal, *alg, aRv);
if (aRv.Failed()) {
return nullptr;
}
return do_AddRef(new DecompressionStream(aGlobal.GetAsSupports(), *stream));
}
already_AddRefed<ReadableStream> DecompressionStream::Readable() const {
return do_AddRef(mStream->Readable());
};
already_AddRefed<WritableStream> DecompressionStream::Writable() const {
return do_AddRef(mStream->Writable());
};
} // namespace mozilla::dom