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84 lines
3 KiB
C++
84 lines
3 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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#ifndef InputStreamLengthWrapper_h
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#define InputStreamLengthWrapper_h
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#include "mozilla/Attributes.h"
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#include "mozilla/Mutex.h"
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#include "nsCOMPtr.h"
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#include "nsIAsyncInputStream.h"
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#include "nsICloneableInputStream.h"
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#include "nsIIPCSerializableInputStream.h"
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#include "nsISeekableStream.h"
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#include "nsIInputStreamLength.h"
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namespace mozilla {
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// A wrapper keeps an inputStream together with its length.
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// This class can be used for nsIInputStreams that do not implement
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// nsIInputStreamLength.
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class InputStreamLengthWrapper final : public nsIAsyncInputStream,
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public nsICloneableInputStream,
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public nsIIPCSerializableInputStream,
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public nsISeekableStream,
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public nsIInputStreamCallback,
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public nsIInputStreamLength {
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public:
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NS_DECL_THREADSAFE_ISUPPORTS
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NS_DECL_NSIINPUTSTREAM
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NS_DECL_NSIASYNCINPUTSTREAM
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NS_DECL_NSICLONEABLEINPUTSTREAM
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NS_DECL_NSIIPCSERIALIZABLEINPUTSTREAM
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NS_DECL_NSISEEKABLESTREAM
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NS_DECL_NSITELLABLESTREAM
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NS_DECL_NSIINPUTSTREAMCALLBACK
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NS_DECL_NSIINPUTSTREAMLENGTH
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// This method creates a InputStreamLengthWrapper around aInputStream if
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// this doesn't implement nsIInputStreamLength or
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// nsIInputStreamAsyncLength interface, but it implements
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// nsIAsyncInputStream. For this kind of streams,
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// InputStreamLengthHelper is not able to retrieve the length. This
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// method will make such streams ready to be used with
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// InputStreamLengthHelper.
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static already_AddRefed<nsIInputStream> MaybeWrap(
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already_AddRefed<nsIInputStream> aInputStream, int64_t aLength);
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// The length here will be used when nsIInputStreamLength::Length() is called.
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InputStreamLengthWrapper(already_AddRefed<nsIInputStream> aInputStream,
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int64_t aLength);
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// This CTOR is meant to be used just for IPC.
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InputStreamLengthWrapper();
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private:
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~InputStreamLengthWrapper();
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void SetSourceStream(already_AddRefed<nsIInputStream> aInputStream);
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nsCOMPtr<nsIInputStream> mInputStream;
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// Raw pointers because these are just QI of mInputStream.
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nsICloneableInputStream* mWeakCloneableInputStream;
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nsIIPCSerializableInputStream* mWeakIPCSerializableInputStream;
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nsISeekableStream* mWeakSeekableInputStream;
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nsITellableStream* mWeakTellableInputStream;
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nsIAsyncInputStream* mWeakAsyncInputStream;
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int64_t mLength;
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bool mConsumed;
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mozilla::Mutex mMutex;
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// This is used for AsyncWait and it's protected by mutex.
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nsCOMPtr<nsIInputStreamCallback> mAsyncWaitCallback MOZ_GUARDED_BY(mMutex);
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};
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} // namespace mozilla
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#endif // InputStreamLengthWrapper_h
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