forked from mirrors/gecko-dev
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 -*- */
|
|
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
|
|
/* 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/. */
|
|
|
|
#ifndef mozilla_InputStreamLengthHelper_h
|
|
#define mozilla_InputStreamLengthHelper_h
|
|
|
|
#include <functional>
|
|
|
|
#include "nsISupportsImpl.h"
|
|
#include "nsIInputStreamLength.h"
|
|
#include "nsThreadUtils.h"
|
|
|
|
class nsIInputStream;
|
|
|
|
namespace mozilla {
|
|
|
|
// This class helps to retrieve the stream's length.
|
|
|
|
class InputStreamLengthHelper final : public Runnable,
|
|
public nsIInputStreamLengthCallback {
|
|
public:
|
|
NS_DECL_ISUPPORTS_INHERITED
|
|
|
|
// This is one of the 2 entry points of this class. It returns false if the
|
|
// length cannot be taken synchronously.
|
|
static bool GetSyncLength(nsIInputStream* aStream, int64_t* aLength);
|
|
|
|
// This is one of the 2 entry points of this class. The callback is executed
|
|
// asynchronously when the length is known.
|
|
static void GetAsyncLength(
|
|
nsIInputStream* aStream,
|
|
const std::function<void(int64_t aLength)>& aCallback);
|
|
|
|
private:
|
|
NS_DECL_NSIINPUTSTREAMLENGTHCALLBACK
|
|
|
|
InputStreamLengthHelper(
|
|
nsIInputStream* aStream,
|
|
const std::function<void(int64_t aLength)>& aCallback);
|
|
|
|
~InputStreamLengthHelper();
|
|
|
|
NS_IMETHOD
|
|
Run() override;
|
|
|
|
void ExecCallback(int64_t aLength);
|
|
|
|
nsCOMPtr<nsIInputStream> mStream;
|
|
std::function<void(int64_t aLength)> mCallback;
|
|
};
|
|
|
|
} // namespace mozilla
|
|
|
|
#endif // mozilla_InputStreamLengthHelper_h
|