mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-12-10 23:52:29 +00:00
1175 lines
31 KiB
C++
1175 lines
31 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/**
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* The multiplex stream concatenates a list of input streams into a single
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* stream.
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*/
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#include "mozilla/Attributes.h"
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#include "mozilla/MathAlgorithms.h"
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#include "mozilla/Mutex.h"
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#include "mozilla/SystemGroup.h"
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#include "base/basictypes.h"
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#include "nsMultiplexInputStream.h"
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#include "nsICloneableInputStream.h"
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#include "nsIMultiplexInputStream.h"
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#include "nsISeekableStream.h"
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#include "nsCOMPtr.h"
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#include "nsCOMArray.h"
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#include "nsIClassInfoImpl.h"
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#include "nsIIPCSerializableInputStream.h"
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#include "mozilla/ipc/InputStreamUtils.h"
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#include "nsIAsyncInputStream.h"
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using namespace mozilla;
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using namespace mozilla::ipc;
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using mozilla::DeprecatedAbs;
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using mozilla::Maybe;
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using mozilla::Nothing;
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using mozilla::Some;
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class nsMultiplexInputStream final
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: public nsIMultiplexInputStream
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, public nsISeekableStream
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, public nsIIPCSerializableInputStream
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, public nsICloneableInputStream
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, public nsIAsyncInputStream
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, public nsIInputStreamCallback
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{
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public:
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nsMultiplexInputStream();
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NS_DECL_THREADSAFE_ISUPPORTS
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NS_DECL_NSIINPUTSTREAM
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NS_DECL_NSIMULTIPLEXINPUTSTREAM
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NS_DECL_NSISEEKABLESTREAM
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NS_DECL_NSIIPCSERIALIZABLEINPUTSTREAM
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NS_DECL_NSICLONEABLEINPUTSTREAM
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NS_DECL_NSIASYNCINPUTSTREAM
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NS_DECL_NSIINPUTSTREAMCALLBACK
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void AsyncWaitCompleted();
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struct StreamData
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{
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void Initialize(nsIInputStream* aStream)
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{
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mStream = aStream;
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mAsyncStream = do_QueryInterface(aStream);
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mSeekableStream = do_QueryInterface(aStream);
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}
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nsCOMPtr<nsIInputStream> mStream;
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// This can be null.
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nsCOMPtr<nsIAsyncInputStream> mAsyncStream;
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// This can be null.
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nsCOMPtr<nsISeekableStream> mSeekableStream;
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};
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private:
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~nsMultiplexInputStream()
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{
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}
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nsresult
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AsyncWaitInternal();
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// This method updates mSeekableStreams, mIPCSerializableStreams,
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// mCloneableStreams and mAsyncInputStreams values.
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void UpdateQIMap(StreamData& aStream, int32_t aCount);
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struct MOZ_STACK_CLASS ReadSegmentsState
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{
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nsCOMPtr<nsIInputStream> mThisStream;
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uint32_t mOffset;
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nsWriteSegmentFun mWriter;
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void* mClosure;
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bool mDone;
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};
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static nsresult ReadSegCb(nsIInputStream* aIn, void* aClosure,
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const char* aFromRawSegment, uint32_t aToOffset,
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uint32_t aCount, uint32_t* aWriteCount);
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bool IsSeekable() const;
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bool IsIPCSerializable() const;
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bool IsCloneable() const;
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bool IsAsyncInputStream() const;
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Mutex mLock; // Protects access to all data members.
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nsTArray<StreamData> mStreams;
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uint32_t mCurrentStream;
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bool mStartedReadingCurrent;
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nsresult mStatus;
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nsCOMPtr<nsIInputStreamCallback> mAsyncWaitCallback;
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uint32_t mAsyncWaitFlags;
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uint32_t mAsyncWaitRequestedCount;
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nsCOMPtr<nsIEventTarget> mAsyncWaitEventTarget;
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uint32_t mSeekableStreams;
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uint32_t mIPCSerializableStreams;
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uint32_t mCloneableStreams;
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uint32_t mAsyncInputStreams;
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};
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NS_IMPL_ADDREF(nsMultiplexInputStream)
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NS_IMPL_RELEASE(nsMultiplexInputStream)
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NS_IMPL_CLASSINFO(nsMultiplexInputStream, nullptr, nsIClassInfo::THREADSAFE,
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NS_MULTIPLEXINPUTSTREAM_CID)
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NS_INTERFACE_MAP_BEGIN(nsMultiplexInputStream)
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NS_INTERFACE_MAP_ENTRY(nsIMultiplexInputStream)
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NS_INTERFACE_MAP_ENTRY(nsIInputStream)
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NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsISeekableStream, IsSeekable())
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NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsIIPCSerializableInputStream,
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IsIPCSerializable())
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NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsICloneableInputStream,
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IsCloneable())
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NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsIAsyncInputStream,
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IsAsyncInputStream())
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NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsIInputStreamCallback,
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IsAsyncInputStream())
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NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIMultiplexInputStream)
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NS_IMPL_QUERY_CLASSINFO(nsMultiplexInputStream)
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NS_INTERFACE_MAP_END
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NS_IMPL_CI_INTERFACE_GETTER(nsMultiplexInputStream,
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nsIMultiplexInputStream,
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nsIInputStream,
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nsISeekableStream)
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static nsresult
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AvailableMaybeSeek(nsMultiplexInputStream::StreamData& aStream,
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uint64_t* aResult)
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{
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nsresult rv = aStream.mStream->Available(aResult);
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if (rv == NS_BASE_STREAM_CLOSED) {
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// Blindly seek to the current position if Available() returns
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// NS_BASE_STREAM_CLOSED.
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// If nsIFileInputStream is closed in Read() due to CLOSE_ON_EOF flag,
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// Seek() could reopen the file if REOPEN_ON_REWIND flag is set.
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if (aStream.mSeekableStream) {
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nsresult rvSeek =
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aStream.mSeekableStream->Seek(nsISeekableStream::NS_SEEK_CUR, 0);
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if (NS_SUCCEEDED(rvSeek)) {
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rv = aStream.mStream->Available(aResult);
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}
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}
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}
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return rv;
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}
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static nsresult
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TellMaybeSeek(nsISeekableStream* aSeekable, int64_t* aResult)
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{
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nsresult rv = aSeekable->Tell(aResult);
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if (rv == NS_BASE_STREAM_CLOSED) {
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// Blindly seek to the current position if Tell() returns
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// NS_BASE_STREAM_CLOSED.
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// If nsIFileInputStream is closed in Read() due to CLOSE_ON_EOF flag,
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// Seek() could reopen the file if REOPEN_ON_REWIND flag is set.
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nsresult rvSeek = aSeekable->Seek(nsISeekableStream::NS_SEEK_CUR, 0);
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if (NS_SUCCEEDED(rvSeek)) {
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rv = aSeekable->Tell(aResult);
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}
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}
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return rv;
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}
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nsMultiplexInputStream::nsMultiplexInputStream()
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: mLock("nsMultiplexInputStream lock")
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, mCurrentStream(0)
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, mStartedReadingCurrent(false)
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, mStatus(NS_OK)
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, mAsyncWaitFlags(0)
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, mAsyncWaitRequestedCount(0)
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, mSeekableStreams(0)
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, mIPCSerializableStreams(0)
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, mCloneableStreams(0)
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, mAsyncInputStreams(0)
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{}
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NS_IMETHODIMP
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nsMultiplexInputStream::GetCount(uint32_t* aCount)
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{
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MutexAutoLock lock(mLock);
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*aCount = mStreams.Length();
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return NS_OK;
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}
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NS_IMETHODIMP
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nsMultiplexInputStream::AppendStream(nsIInputStream* aStream)
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{
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MutexAutoLock lock(mLock);
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StreamData* streamData = mStreams.AppendElement();
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if (NS_WARN_IF(!streamData)) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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streamData->Initialize(aStream);
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UpdateQIMap(*streamData, 1);
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if (mStatus == NS_BASE_STREAM_CLOSED) {
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// We were closed, but now we have more data to read.
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mStatus = NS_OK;
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}
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return NS_OK;
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}
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NS_IMETHODIMP
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nsMultiplexInputStream::GetStream(uint32_t aIndex, nsIInputStream** aResult)
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{
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MutexAutoLock lock(mLock);
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if (aIndex >= mStreams.Length()) {
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return NS_ERROR_NOT_AVAILABLE;
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}
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StreamData& streamData = mStreams.ElementAt(aIndex);
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nsCOMPtr<nsIInputStream> stream = streamData.mStream;
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stream.forget(aResult);
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return NS_OK;
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}
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NS_IMETHODIMP
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nsMultiplexInputStream::Close()
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{
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nsTArray<nsCOMPtr<nsIInputStream>> streams;
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// Let's take a copy of the streams becuase, calling close() it could trigger
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// a nsIInputStreamCallback immediately and we don't want to create a deadlock
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// with mutex.
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{
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MutexAutoLock lock(mLock);
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uint32_t len = mStreams.Length();
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for (uint32_t i = 0; i < len; ++i) {
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streams.AppendElement(mStreams[i].mStream);
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}
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mStatus = NS_BASE_STREAM_CLOSED;
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}
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nsresult rv = NS_OK;
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uint32_t len = streams.Length();
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for (uint32_t i = 0; i < len; ++i) {
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nsresult rv2 = streams[i]->Close();
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// We still want to close all streams, but we should return an error
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if (NS_FAILED(rv2)) {
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rv = rv2;
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}
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}
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return rv;
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}
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NS_IMETHODIMP
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nsMultiplexInputStream::Available(uint64_t* aResult)
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{
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*aResult = 0;
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MutexAutoLock lock(mLock);
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if (NS_FAILED(mStatus)) {
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return mStatus;
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}
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uint64_t avail = 0;
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nsresult rv = NS_BASE_STREAM_CLOSED;
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uint32_t len = mStreams.Length();
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for (uint32_t i = mCurrentStream; i < len; i++) {
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uint64_t streamAvail;
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rv = AvailableMaybeSeek(mStreams[i], &streamAvail);
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if (rv == NS_BASE_STREAM_CLOSED) {
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// If a stream is closed, we continue with the next one.
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// If this is the current stream we move to the following stream.
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if (mCurrentStream == i) {
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++mCurrentStream;
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}
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// If this is the last stream, we want to return this error code.
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continue;
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}
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if (NS_WARN_IF(NS_FAILED(rv))) {
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mStatus = rv;
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return mStatus;
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}
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// If the current stream is async, we have to return what we have so far
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// without processing the following streams. This is needed because
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// ::Available should return only what is currently available. In case of an
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// nsIAsyncInputStream, we have to call AsyncWait() in order to read more.
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if (mStreams[i].mAsyncStream) {
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avail += streamAvail;
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break;
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}
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if (streamAvail == 0) {
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// Nothing to read for this stream. Let's move to the next one.
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continue;
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}
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avail += streamAvail;
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}
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// We still have something to read. We don't want to return an error code yet.
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if (avail) {
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*aResult = avail;
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return NS_OK;
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}
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// Let's propagate the last error message.
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mStatus = rv;
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return rv;
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}
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NS_IMETHODIMP
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nsMultiplexInputStream::Read(char* aBuf, uint32_t aCount, uint32_t* aResult)
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{
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MutexAutoLock lock(mLock);
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// It is tempting to implement this method in terms of ReadSegments, but
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// that would prevent this class from being used with streams that only
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// implement Read (e.g., file streams).
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*aResult = 0;
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if (mStatus == NS_BASE_STREAM_CLOSED) {
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return NS_OK;
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}
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if (NS_FAILED(mStatus)) {
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return mStatus;
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}
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nsresult rv = NS_OK;
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uint32_t len = mStreams.Length();
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while (mCurrentStream < len && aCount) {
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uint32_t read;
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rv = mStreams[mCurrentStream].mStream->Read(aBuf, aCount, &read);
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// XXX some streams return NS_BASE_STREAM_CLOSED to indicate EOF.
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// (This is a bug in those stream implementations)
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if (rv == NS_BASE_STREAM_CLOSED) {
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NS_NOTREACHED("Input stream's Read method returned NS_BASE_STREAM_CLOSED");
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rv = NS_OK;
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read = 0;
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} else if (NS_FAILED(rv)) {
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break;
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}
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if (read == 0) {
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++mCurrentStream;
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mStartedReadingCurrent = false;
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} else {
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NS_ASSERTION(aCount >= read, "Read more than requested");
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*aResult += read;
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aCount -= read;
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aBuf += read;
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mStartedReadingCurrent = true;
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}
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}
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return *aResult ? NS_OK : rv;
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}
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NS_IMETHODIMP
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nsMultiplexInputStream::ReadSegments(nsWriteSegmentFun aWriter, void* aClosure,
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uint32_t aCount, uint32_t* aResult)
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{
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MutexAutoLock lock(mLock);
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if (mStatus == NS_BASE_STREAM_CLOSED) {
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*aResult = 0;
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return NS_OK;
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}
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if (NS_FAILED(mStatus)) {
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return mStatus;
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}
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NS_ASSERTION(aWriter, "missing aWriter");
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nsresult rv = NS_OK;
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ReadSegmentsState state;
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state.mThisStream = this;
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state.mOffset = 0;
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state.mWriter = aWriter;
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state.mClosure = aClosure;
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state.mDone = false;
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uint32_t len = mStreams.Length();
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while (mCurrentStream < len && aCount) {
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uint32_t read;
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rv = mStreams[mCurrentStream].mStream->ReadSegments(ReadSegCb, &state,
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aCount, &read);
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// XXX some streams return NS_BASE_STREAM_CLOSED to indicate EOF.
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// (This is a bug in those stream implementations)
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if (rv == NS_BASE_STREAM_CLOSED) {
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NS_NOTREACHED("Input stream's Read method returned NS_BASE_STREAM_CLOSED");
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rv = NS_OK;
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read = 0;
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}
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// if |aWriter| decided to stop reading segments...
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if (state.mDone || NS_FAILED(rv)) {
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break;
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}
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// if stream is empty, then advance to the next stream.
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if (read == 0) {
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++mCurrentStream;
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mStartedReadingCurrent = false;
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} else {
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NS_ASSERTION(aCount >= read, "Read more than requested");
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state.mOffset += read;
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aCount -= read;
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mStartedReadingCurrent = true;
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}
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}
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// if we successfully read some data, then this call succeeded.
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*aResult = state.mOffset;
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return state.mOffset ? NS_OK : rv;
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}
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nsresult
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nsMultiplexInputStream::ReadSegCb(nsIInputStream* aIn, void* aClosure,
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const char* aFromRawSegment,
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uint32_t aToOffset, uint32_t aCount,
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uint32_t* aWriteCount)
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{
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nsresult rv;
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ReadSegmentsState* state = (ReadSegmentsState*)aClosure;
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rv = (state->mWriter)(state->mThisStream,
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state->mClosure,
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aFromRawSegment,
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aToOffset + state->mOffset,
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aCount,
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aWriteCount);
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if (NS_FAILED(rv)) {
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state->mDone = true;
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}
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return rv;
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}
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NS_IMETHODIMP
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nsMultiplexInputStream::IsNonBlocking(bool* aNonBlocking)
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{
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MutexAutoLock lock(mLock);
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uint32_t len = mStreams.Length();
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if (len == 0) {
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// Claim to be non-blocking, since we won't block the caller.
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*aNonBlocking = true;
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return NS_OK;
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}
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for (uint32_t i = 0; i < len; ++i) {
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nsresult rv = mStreams[i].mStream->IsNonBlocking(aNonBlocking);
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if (NS_WARN_IF(NS_FAILED(rv))) {
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return rv;
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}
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// If one is blocking the entire stream becomes blocking.
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if (!*aNonBlocking) {
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return NS_OK;
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}
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}
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return NS_OK;
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}
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NS_IMETHODIMP
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nsMultiplexInputStream::Seek(int32_t aWhence, int64_t aOffset)
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{
|
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MutexAutoLock lock(mLock);
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if (NS_FAILED(mStatus)) {
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return mStatus;
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}
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nsresult rv;
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uint32_t oldCurrentStream = mCurrentStream;
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bool oldStartedReadingCurrent = mStartedReadingCurrent;
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if (aWhence == NS_SEEK_SET) {
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int64_t remaining = aOffset;
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if (aOffset == 0) {
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mCurrentStream = 0;
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}
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for (uint32_t i = 0; i < mStreams.Length(); ++i) {
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nsCOMPtr<nsISeekableStream> stream = mStreams[i].mSeekableStream;
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if (!stream) {
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return NS_ERROR_FAILURE;
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}
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// See if all remaining streams should be rewound
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if (remaining == 0) {
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if (i < oldCurrentStream ||
|
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(i == oldCurrentStream && oldStartedReadingCurrent)) {
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rv = stream->Seek(NS_SEEK_SET, 0);
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if (NS_WARN_IF(NS_FAILED(rv))) {
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return rv;
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}
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continue;
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} else {
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break;
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}
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}
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|
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// Get position in current stream
|
|
int64_t streamPos;
|
|
if (i > oldCurrentStream ||
|
|
(i == oldCurrentStream && !oldStartedReadingCurrent)) {
|
|
streamPos = 0;
|
|
} else {
|
|
rv = TellMaybeSeek(stream, &streamPos);
|
|
if (NS_WARN_IF(NS_FAILED(rv))) {
|
|
return rv;
|
|
}
|
|
}
|
|
|
|
// See if we need to seek current stream forward or backward
|
|
if (remaining < streamPos) {
|
|
rv = stream->Seek(NS_SEEK_SET, remaining);
|
|
if (NS_WARN_IF(NS_FAILED(rv))) {
|
|
return rv;
|
|
}
|
|
|
|
mCurrentStream = i;
|
|
mStartedReadingCurrent = remaining != 0;
|
|
|
|
remaining = 0;
|
|
} else if (remaining > streamPos) {
|
|
if (i < oldCurrentStream) {
|
|
// We're already at end so no need to seek this stream
|
|
remaining -= streamPos;
|
|
NS_ASSERTION(remaining >= 0, "Remaining invalid");
|
|
} else {
|
|
uint64_t avail;
|
|
rv = AvailableMaybeSeek(mStreams[i], &avail);
|
|
if (NS_WARN_IF(NS_FAILED(rv))) {
|
|
return rv;
|
|
}
|
|
|
|
int64_t newPos = XPCOM_MIN(remaining, streamPos + (int64_t)avail);
|
|
|
|
rv = stream->Seek(NS_SEEK_SET, newPos);
|
|
if (NS_WARN_IF(NS_FAILED(rv))) {
|
|
return rv;
|
|
}
|
|
|
|
mCurrentStream = i;
|
|
mStartedReadingCurrent = true;
|
|
|
|
remaining -= newPos;
|
|
NS_ASSERTION(remaining >= 0, "Remaining invalid");
|
|
}
|
|
} else {
|
|
NS_ASSERTION(remaining == streamPos, "Huh?");
|
|
MOZ_ASSERT(remaining != 0, "Zero remaining should be handled earlier");
|
|
remaining = 0;
|
|
mCurrentStream = i;
|
|
mStartedReadingCurrent = true;
|
|
}
|
|
}
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
if (aWhence == NS_SEEK_CUR && aOffset > 0) {
|
|
int64_t remaining = aOffset;
|
|
for (uint32_t i = mCurrentStream; remaining && i < mStreams.Length(); ++i) {
|
|
uint64_t avail;
|
|
rv = AvailableMaybeSeek(mStreams[i], &avail);
|
|
if (NS_WARN_IF(NS_FAILED(rv))) {
|
|
return rv;
|
|
}
|
|
|
|
int64_t seek = XPCOM_MIN((int64_t)avail, remaining);
|
|
|
|
rv = mStreams[i].mSeekableStream->Seek(NS_SEEK_CUR, seek);
|
|
if (NS_WARN_IF(NS_FAILED(rv))) {
|
|
return rv;
|
|
}
|
|
|
|
mCurrentStream = i;
|
|
mStartedReadingCurrent = true;
|
|
|
|
remaining -= seek;
|
|
}
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
if (aWhence == NS_SEEK_CUR && aOffset < 0) {
|
|
int64_t remaining = -aOffset;
|
|
for (uint32_t i = mCurrentStream; remaining && i != (uint32_t)-1; --i) {
|
|
int64_t pos;
|
|
rv = TellMaybeSeek(mStreams[i].mSeekableStream, &pos);
|
|
if (NS_WARN_IF(NS_FAILED(rv))) {
|
|
return rv;
|
|
}
|
|
|
|
int64_t seek = XPCOM_MIN(pos, remaining);
|
|
|
|
rv = mStreams[i].mSeekableStream->Seek(NS_SEEK_CUR, -seek);
|
|
if (NS_WARN_IF(NS_FAILED(rv))) {
|
|
return rv;
|
|
}
|
|
|
|
mCurrentStream = i;
|
|
mStartedReadingCurrent = seek != -pos;
|
|
|
|
remaining -= seek;
|
|
}
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
if (aWhence == NS_SEEK_CUR) {
|
|
NS_ASSERTION(aOffset == 0, "Should have handled all non-zero values");
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
if (aWhence == NS_SEEK_END) {
|
|
if (aOffset > 0) {
|
|
return NS_ERROR_INVALID_ARG;
|
|
}
|
|
int64_t remaining = aOffset;
|
|
for (uint32_t i = mStreams.Length() - 1; i != (uint32_t)-1; --i) {
|
|
nsCOMPtr<nsISeekableStream> stream = mStreams[i].mSeekableStream;
|
|
|
|
// See if all remaining streams should be seeked to end
|
|
if (remaining == 0) {
|
|
if (i >= oldCurrentStream) {
|
|
rv = stream->Seek(NS_SEEK_END, 0);
|
|
if (NS_WARN_IF(NS_FAILED(rv))) {
|
|
return rv;
|
|
}
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
|
|
// Get position in current stream
|
|
int64_t streamPos;
|
|
if (i < oldCurrentStream) {
|
|
streamPos = 0;
|
|
} else {
|
|
uint64_t avail;
|
|
rv = AvailableMaybeSeek(mStreams[i], &avail);
|
|
if (NS_WARN_IF(NS_FAILED(rv))) {
|
|
return rv;
|
|
}
|
|
|
|
streamPos = avail;
|
|
}
|
|
|
|
// See if we have enough data in the current stream.
|
|
if (DeprecatedAbs(remaining) < streamPos) {
|
|
rv = stream->Seek(NS_SEEK_END, remaining);
|
|
if (NS_WARN_IF(NS_FAILED(rv))) {
|
|
return rv;
|
|
}
|
|
|
|
mCurrentStream = i;
|
|
mStartedReadingCurrent = true;
|
|
|
|
remaining = 0;
|
|
} else if (DeprecatedAbs(remaining) > streamPos) {
|
|
if (i > oldCurrentStream ||
|
|
(i == oldCurrentStream && !oldStartedReadingCurrent)) {
|
|
// We're already at start so no need to seek this stream
|
|
remaining += streamPos;
|
|
} else {
|
|
int64_t avail;
|
|
rv = TellMaybeSeek(stream, &avail);
|
|
if (NS_WARN_IF(NS_FAILED(rv))) {
|
|
return rv;
|
|
}
|
|
|
|
int64_t newPos = streamPos + XPCOM_MIN(avail, DeprecatedAbs(remaining));
|
|
|
|
rv = stream->Seek(NS_SEEK_END, -newPos);
|
|
if (NS_WARN_IF(NS_FAILED(rv))) {
|
|
return rv;
|
|
}
|
|
|
|
mCurrentStream = i;
|
|
mStartedReadingCurrent = true;
|
|
|
|
remaining += newPos;
|
|
}
|
|
} else {
|
|
NS_ASSERTION(remaining == streamPos, "Huh?");
|
|
remaining = 0;
|
|
}
|
|
}
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
// other Seeks not implemented yet
|
|
return NS_ERROR_NOT_IMPLEMENTED;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsMultiplexInputStream::Tell(int64_t* aResult)
|
|
{
|
|
MutexAutoLock lock(mLock);
|
|
|
|
if (NS_FAILED(mStatus)) {
|
|
return mStatus;
|
|
}
|
|
|
|
nsresult rv;
|
|
int64_t ret64 = 0;
|
|
uint32_t i, last;
|
|
last = mStartedReadingCurrent ? mCurrentStream + 1 : mCurrentStream;
|
|
for (i = 0; i < last; ++i) {
|
|
if (NS_WARN_IF(!mStreams[i].mSeekableStream)) {
|
|
return NS_ERROR_NO_INTERFACE;
|
|
}
|
|
|
|
int64_t pos;
|
|
rv = TellMaybeSeek(mStreams[i].mSeekableStream, &pos);
|
|
if (NS_WARN_IF(NS_FAILED(rv))) {
|
|
return rv;
|
|
}
|
|
ret64 += pos;
|
|
}
|
|
*aResult = ret64;
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsMultiplexInputStream::SetEOF()
|
|
{
|
|
return NS_ERROR_NOT_IMPLEMENTED;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsMultiplexInputStream::CloseWithStatus(nsresult aStatus)
|
|
{
|
|
return Close();
|
|
}
|
|
|
|
// This class is used to inform nsMultiplexInputStream that it's time to execute
|
|
// the asyncWait callback.
|
|
class AsyncWaitRunnable final : public CancelableRunnable
|
|
{
|
|
RefPtr<nsMultiplexInputStream> mStream;
|
|
|
|
public:
|
|
static void
|
|
Create(nsMultiplexInputStream* aStream, nsIEventTarget* aEventTarget)
|
|
{
|
|
RefPtr<AsyncWaitRunnable> runnable = new AsyncWaitRunnable(aStream);
|
|
if (aEventTarget) {
|
|
aEventTarget->Dispatch(runnable.forget(), NS_DISPATCH_NORMAL);
|
|
} else {
|
|
runnable->Run();
|
|
}
|
|
}
|
|
|
|
NS_IMETHOD
|
|
Run() override
|
|
{
|
|
mStream->AsyncWaitCompleted();
|
|
return NS_OK;
|
|
}
|
|
|
|
private:
|
|
explicit AsyncWaitRunnable(nsMultiplexInputStream* aStream)
|
|
: CancelableRunnable("AsyncWaitRunnable")
|
|
, mStream(aStream)
|
|
{
|
|
MOZ_ASSERT(aStream);
|
|
}
|
|
|
|
};
|
|
|
|
NS_IMETHODIMP
|
|
nsMultiplexInputStream::AsyncWait(nsIInputStreamCallback* aCallback,
|
|
uint32_t aFlags,
|
|
uint32_t aRequestedCount,
|
|
nsIEventTarget* aEventTarget)
|
|
{
|
|
{
|
|
MutexAutoLock lock(mLock);
|
|
|
|
// We must execute the callback also when the stream is closed.
|
|
if (NS_FAILED(mStatus) && mStatus != NS_BASE_STREAM_CLOSED) {
|
|
return mStatus;
|
|
}
|
|
|
|
if (mAsyncWaitCallback && aCallback) {
|
|
return NS_ERROR_FAILURE;
|
|
}
|
|
|
|
mAsyncWaitCallback = aCallback;
|
|
mAsyncWaitFlags = aFlags;
|
|
mAsyncWaitRequestedCount = aRequestedCount;
|
|
mAsyncWaitEventTarget = aEventTarget;
|
|
|
|
if (!mAsyncWaitCallback) {
|
|
return NS_OK;
|
|
}
|
|
}
|
|
|
|
return AsyncWaitInternal();
|
|
}
|
|
|
|
nsresult
|
|
nsMultiplexInputStream::AsyncWaitInternal()
|
|
{
|
|
nsCOMPtr<nsIAsyncInputStream> stream;
|
|
uint32_t asyncWaitFlags = 0;
|
|
uint32_t asyncWaitRequestedCount = 0;
|
|
nsCOMPtr<nsIEventTarget> asyncWaitEventTarget;
|
|
|
|
{
|
|
MutexAutoLock lock(mLock);
|
|
|
|
// Let's take the first async stream if we are not already closed, and if
|
|
// it has data to read or if it async.
|
|
if (mStatus != NS_BASE_STREAM_CLOSED) {
|
|
for (; mCurrentStream < mStreams.Length(); ++mCurrentStream) {
|
|
stream = mStreams[mCurrentStream].mAsyncStream;
|
|
if (stream) {
|
|
break;
|
|
}
|
|
|
|
uint64_t avail = 0;
|
|
nsresult rv = AvailableMaybeSeek(mStreams[mCurrentStream], &avail);
|
|
if (rv == NS_BASE_STREAM_CLOSED || (NS_SUCCEEDED(rv) && avail == 0)) {
|
|
// Nothing to read here. Let's move on.
|
|
continue;
|
|
}
|
|
|
|
if (NS_FAILED(rv)) {
|
|
return rv;
|
|
}
|
|
|
|
break;
|
|
}
|
|
}
|
|
|
|
asyncWaitFlags = mAsyncWaitFlags;
|
|
asyncWaitRequestedCount = mAsyncWaitRequestedCount;
|
|
asyncWaitEventTarget = mAsyncWaitEventTarget;
|
|
}
|
|
|
|
MOZ_ASSERT_IF(stream, NS_SUCCEEDED(mStatus));
|
|
|
|
// If we are here it's because we are already closed, or if the current stream
|
|
// is not async. In both case we have to execute the callback.
|
|
if (!stream) {
|
|
AsyncWaitRunnable::Create(this, asyncWaitEventTarget);
|
|
return NS_OK;
|
|
}
|
|
|
|
return stream->AsyncWait(this, asyncWaitFlags, asyncWaitRequestedCount,
|
|
asyncWaitEventTarget);
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsMultiplexInputStream::OnInputStreamReady(nsIAsyncInputStream* aStream)
|
|
{
|
|
nsCOMPtr<nsIInputStreamCallback> callback;
|
|
|
|
// When OnInputStreamReady is called, we could be in 2 scenarios:
|
|
// a. there is something to read;
|
|
// b. the stream is closed.
|
|
// But if the stream is closed and it was not the last one, we must proceed
|
|
// with the following stream in order to have something to read by the callee.
|
|
|
|
{
|
|
MutexAutoLock lock(mLock);
|
|
|
|
// The callback has been nullified in the meantime.
|
|
if (!mAsyncWaitCallback) {
|
|
return NS_OK;
|
|
}
|
|
|
|
if (NS_SUCCEEDED(mStatus)) {
|
|
uint64_t avail = 0;
|
|
nsresult rv = aStream->Available(&avail);
|
|
if (rv == NS_BASE_STREAM_CLOSED || avail == 0) {
|
|
// This stream is closed or empty, let's move to the following one.
|
|
++mCurrentStream;
|
|
MutexAutoUnlock unlock(mLock);
|
|
return AsyncWaitInternal();
|
|
}
|
|
}
|
|
|
|
mAsyncWaitCallback.swap(callback);
|
|
mAsyncWaitEventTarget = nullptr;
|
|
}
|
|
|
|
return callback->OnInputStreamReady(this);
|
|
}
|
|
|
|
void
|
|
nsMultiplexInputStream::AsyncWaitCompleted()
|
|
{
|
|
nsCOMPtr<nsIInputStreamCallback> callback;
|
|
|
|
{
|
|
MutexAutoLock lock(mLock);
|
|
|
|
// The callback has been nullified in the meantime.
|
|
if (!mAsyncWaitCallback) {
|
|
return;
|
|
}
|
|
|
|
mAsyncWaitCallback.swap(callback);
|
|
mAsyncWaitEventTarget = nullptr;
|
|
}
|
|
|
|
callback->OnInputStreamReady(this);
|
|
}
|
|
|
|
nsresult
|
|
nsMultiplexInputStreamConstructor(nsISupports* aOuter,
|
|
REFNSIID aIID,
|
|
void** aResult)
|
|
{
|
|
*aResult = nullptr;
|
|
|
|
if (aOuter) {
|
|
return NS_ERROR_NO_AGGREGATION;
|
|
}
|
|
|
|
RefPtr<nsMultiplexInputStream> inst = new nsMultiplexInputStream();
|
|
|
|
return inst->QueryInterface(aIID, aResult);
|
|
}
|
|
|
|
void
|
|
nsMultiplexInputStream::Serialize(InputStreamParams& aParams,
|
|
FileDescriptorArray& aFileDescriptors)
|
|
{
|
|
MutexAutoLock lock(mLock);
|
|
|
|
MultiplexInputStreamParams params;
|
|
|
|
uint32_t streamCount = mStreams.Length();
|
|
|
|
if (streamCount) {
|
|
InfallibleTArray<InputStreamParams>& streams = params.streams();
|
|
|
|
streams.SetCapacity(streamCount);
|
|
for (uint32_t index = 0; index < streamCount; index++) {
|
|
InputStreamParams childStreamParams;
|
|
InputStreamHelper::SerializeInputStream(mStreams[index].mStream,
|
|
childStreamParams,
|
|
aFileDescriptors);
|
|
|
|
streams.AppendElement(childStreamParams);
|
|
}
|
|
}
|
|
|
|
params.currentStream() = mCurrentStream;
|
|
params.status() = mStatus;
|
|
params.startedReadingCurrent() = mStartedReadingCurrent;
|
|
|
|
aParams = params;
|
|
}
|
|
|
|
bool
|
|
nsMultiplexInputStream::Deserialize(const InputStreamParams& aParams,
|
|
const FileDescriptorArray& aFileDescriptors)
|
|
{
|
|
if (aParams.type() !=
|
|
InputStreamParams::TMultiplexInputStreamParams) {
|
|
NS_ERROR("Received unknown parameters from the other process!");
|
|
return false;
|
|
}
|
|
|
|
const MultiplexInputStreamParams& params =
|
|
aParams.get_MultiplexInputStreamParams();
|
|
|
|
const InfallibleTArray<InputStreamParams>& streams = params.streams();
|
|
|
|
uint32_t streamCount = streams.Length();
|
|
for (uint32_t index = 0; index < streamCount; index++) {
|
|
nsCOMPtr<nsIInputStream> stream =
|
|
InputStreamHelper::DeserializeInputStream(streams[index],
|
|
aFileDescriptors);
|
|
if (!stream) {
|
|
NS_WARNING("Deserialize failed!");
|
|
return false;
|
|
}
|
|
|
|
if (NS_FAILED(AppendStream(stream))) {
|
|
NS_WARNING("AppendStream failed!");
|
|
return false;
|
|
}
|
|
}
|
|
|
|
mCurrentStream = params.currentStream();
|
|
mStatus = params.status();
|
|
mStartedReadingCurrent = params.startedReadingCurrent();
|
|
|
|
return true;
|
|
}
|
|
|
|
Maybe<uint64_t>
|
|
nsMultiplexInputStream::ExpectedSerializedLength()
|
|
{
|
|
MutexAutoLock lock(mLock);
|
|
|
|
bool lengthValueExists = false;
|
|
uint64_t expectedLength = 0;
|
|
uint32_t streamCount = mStreams.Length();
|
|
for (uint32_t index = 0; index < streamCount; index++) {
|
|
nsCOMPtr<nsIIPCSerializableInputStream> stream =
|
|
do_QueryInterface(mStreams[index].mStream);
|
|
if (!stream) {
|
|
continue;
|
|
}
|
|
Maybe<uint64_t> length = stream->ExpectedSerializedLength();
|
|
if (length.isNothing()) {
|
|
continue;
|
|
}
|
|
lengthValueExists = true;
|
|
expectedLength += length.value();
|
|
}
|
|
return lengthValueExists ? Some(expectedLength) : Nothing();
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsMultiplexInputStream::GetCloneable(bool* aCloneable)
|
|
{
|
|
MutexAutoLock lock(mLock);
|
|
//XXXnsm Cloning a multiplex stream which has started reading is not permitted
|
|
//right now.
|
|
if (mCurrentStream > 0 || mStartedReadingCurrent) {
|
|
*aCloneable = false;
|
|
return NS_OK;
|
|
}
|
|
|
|
uint32_t len = mStreams.Length();
|
|
for (uint32_t i = 0; i < len; ++i) {
|
|
nsCOMPtr<nsICloneableInputStream> cis =
|
|
do_QueryInterface(mStreams[i].mStream);
|
|
if (!cis || !cis->GetCloneable()) {
|
|
*aCloneable = false;
|
|
return NS_OK;
|
|
}
|
|
}
|
|
|
|
*aCloneable = true;
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsMultiplexInputStream::Clone(nsIInputStream** aClone)
|
|
{
|
|
MutexAutoLock lock(mLock);
|
|
|
|
//XXXnsm Cloning a multiplex stream which has started reading is not permitted
|
|
//right now.
|
|
if (mCurrentStream > 0 || mStartedReadingCurrent) {
|
|
return NS_ERROR_FAILURE;
|
|
}
|
|
|
|
RefPtr<nsMultiplexInputStream> clone = new nsMultiplexInputStream();
|
|
|
|
nsresult rv;
|
|
uint32_t len = mStreams.Length();
|
|
for (uint32_t i = 0; i < len; ++i) {
|
|
nsCOMPtr<nsICloneableInputStream> substream =
|
|
do_QueryInterface(mStreams[i].mStream);
|
|
if (NS_WARN_IF(!substream)) {
|
|
return NS_ERROR_FAILURE;
|
|
}
|
|
|
|
nsCOMPtr<nsIInputStream> clonedSubstream;
|
|
rv = substream->Clone(getter_AddRefs(clonedSubstream));
|
|
if (NS_WARN_IF(NS_FAILED(rv))) {
|
|
return rv;
|
|
}
|
|
|
|
rv = clone->AppendStream(clonedSubstream);
|
|
if (NS_WARN_IF(NS_FAILED(rv))) {
|
|
return rv;
|
|
}
|
|
}
|
|
|
|
clone.forget(aClone);
|
|
return NS_OK;
|
|
}
|
|
|
|
#define MAYBE_UPDATE_VALUE_REAL(x, y) \
|
|
if (y) { \
|
|
if (aCount == 1) { \
|
|
++x; \
|
|
} else if (x > 0) { \
|
|
--x; \
|
|
} else { \
|
|
MOZ_CRASH("A nsIInputStream changed QI map when stored in a nsMultiplexInputStream!"); \
|
|
} \
|
|
}
|
|
|
|
#define MAYBE_UPDATE_VALUE(x, y) \
|
|
{ \
|
|
nsCOMPtr<y> substream = do_QueryInterface(aStream.mStream); \
|
|
MAYBE_UPDATE_VALUE_REAL(x, substream) \
|
|
}
|
|
|
|
void
|
|
nsMultiplexInputStream::UpdateQIMap(StreamData& aStream, int32_t aCount)
|
|
{
|
|
MOZ_ASSERT(aCount == -1 || aCount == 1);
|
|
|
|
MAYBE_UPDATE_VALUE_REAL(mSeekableStreams, aStream.mSeekableStream)
|
|
MAYBE_UPDATE_VALUE(mIPCSerializableStreams, nsIIPCSerializableInputStream)
|
|
MAYBE_UPDATE_VALUE(mCloneableStreams, nsICloneableInputStream)
|
|
MAYBE_UPDATE_VALUE_REAL(mAsyncInputStreams, aStream.mAsyncStream)
|
|
}
|
|
|
|
#undef MAYBE_UPDATE_VALUE
|
|
|
|
bool
|
|
nsMultiplexInputStream::IsSeekable() const
|
|
{
|
|
return mStreams.Length() == mSeekableStreams;
|
|
}
|
|
|
|
bool
|
|
nsMultiplexInputStream::IsIPCSerializable() const
|
|
{
|
|
return mStreams.Length() == mIPCSerializableStreams;
|
|
}
|
|
|
|
bool
|
|
nsMultiplexInputStream::IsCloneable() const
|
|
{
|
|
return mStreams.Length() == mCloneableStreams;
|
|
}
|
|
|
|
bool
|
|
nsMultiplexInputStream::IsAsyncInputStream() const
|
|
{
|
|
// nsMultiplexInputStream is nsIAsyncInputStream if at least 1 of the
|
|
// substream implements that interface.
|
|
return !!mAsyncInputStreams;
|
|
}
|