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