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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
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "mozilla/dom/CompressionStream.h"
#include "FormatBrotli.h"
#include "FormatZlib.h"
#include "js/TypeDecls.h"
#include "mozilla/dom/CompressionStreamBinding.h"
#include "mozilla/dom/ReadableStream.h"
#include "mozilla/dom/TextDecoderStream.h"
#include "mozilla/dom/TransformStream.h"
#include "mozilla/dom/WritableStream.h"
// See the zlib manual in https://www.zlib.net/manual.html or in
// https://searchfox.org/mozilla-central/source/modules/zlib/src/zlib.h
namespace mozilla::dom {
using namespace compression;
NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(CompressionStream, mGlobal, mStream)
NS_IMPL_CYCLE_COLLECTING_ADDREF(CompressionStream)
NS_IMPL_CYCLE_COLLECTING_RELEASE(CompressionStream)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(CompressionStream)
NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END
/*
* Constructs either a ZLibDecompressionStreamAlgorithms or a
* BrotliDecompressionStreamAlgorithms, based on the CompressionFormat.
*/
static Result<already_AddRefed<CompressionStreamAlgorithms>, nsresult>
CreateCompressionStreamAlgorithms(CompressionFormat aFormat) {
if (aFormat == CompressionFormat::Brotli) {
RefPtr<CompressionStreamAlgorithms> brotliAlgos =
MOZ_TRY(BrotliCompressionStreamAlgorithms::Create());
return brotliAlgos.forget();
}
RefPtr<CompressionStreamAlgorithms> zlibAlgos =
MOZ_TRY(ZLibCompressionStreamAlgorithms::Create(aFormat));
return zlibAlgos.forget();
}
CompressionStream::CompressionStream(nsISupports* aGlobal,
TransformStream& aStream)
: mGlobal(aGlobal), mStream(&aStream) {}
CompressionStream::~CompressionStream() = default;
JSObject* CompressionStream::WrapObject(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) {
return CompressionStream_Binding::Wrap(aCx, this, aGivenProto);
}
// https://wicg.github.io/compression/#dom-compressionstream-compressionstream
already_AddRefed<CompressionStream> CompressionStream::Constructor(
const GlobalObject& aGlobal, CompressionFormat aFormat, ErrorResult& aRv) {
if (aFormat == CompressionFormat::Zstd) {
aRv.ThrowTypeError(
"'zstd' (value of argument 1) is not a valid value for enumeration "
"CompressionFormat.");
return nullptr;
}
// Step 1: If format is unsupported in CompressionStream, then throw a
// TypeError.
// XXX: Skipped as we are using enum for this
// Step 2 - 4: (Done in CompressionStreamAlgorithms)
// 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<CompressionStreamAlgorithms>, nsresult> algorithms =
CreateCompressionStreamAlgorithms(aFormat);
if (algorithms.isErr()) {
aRv.ThrowUnknownError("Not enough memory");
return nullptr;
}
RefPtr<CompressionStreamAlgorithms> alg = algorithms.unwrap();
RefPtr<TransformStream> stream =
TransformStream::CreateGeneric(aGlobal, *alg, aRv);
if (aRv.Failed()) {
return nullptr;
}
return do_AddRef(new CompressionStream(aGlobal.GetAsSupports(), *stream));
}
already_AddRefed<ReadableStream> CompressionStream::Readable() const {
return do_AddRef(mStream->Readable());
}
already_AddRefed<WritableStream> CompressionStream::Writable() const {
return do_AddRef(mStream->Writable());
}
} // namespace mozilla::dom
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