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2bd348aaf4
Differential Revision: https://phabricator.services.mozilla.com/D69656 --HG-- extra : moz-landing-system : lando
57 lines
1.6 KiB
C++
57 lines
1.6 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 mozilla_InputStreamLengthHelper_h
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#define mozilla_InputStreamLengthHelper_h
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#include <functional>
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#include "nsISupportsImpl.h"
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#include "nsIInputStreamLength.h"
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#include "nsThreadUtils.h"
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class nsIInputStream;
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namespace mozilla {
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// This class helps to retrieve the stream's length.
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class InputStreamLengthHelper final : public Runnable,
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public nsIInputStreamLengthCallback {
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public:
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NS_DECL_ISUPPORTS_INHERITED
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// This is one of the 2 entry points of this class. It returns false if the
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// length cannot be taken synchronously.
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static bool GetSyncLength(nsIInputStream* aStream, int64_t* aLength);
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// This is one of the 2 entry points of this class. The callback is executed
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// asynchronously when the length is known.
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static void GetAsyncLength(
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nsIInputStream* aStream,
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const std::function<void(int64_t aLength)>& aCallback);
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private:
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NS_DECL_NSIINPUTSTREAMLENGTHCALLBACK
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InputStreamLengthHelper(
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nsIInputStream* aStream,
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const std::function<void(int64_t aLength)>& aCallback);
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~InputStreamLengthHelper();
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NS_IMETHOD
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Run() override;
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void ExecCallback(int64_t aLength);
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nsCOMPtr<nsIInputStream> mStream;
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std::function<void(int64_t aLength)> mCallback;
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};
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} // namespace mozilla
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#endif // mozilla_InputStreamLengthHelper_h
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