Quelle nsPreloadedStream.h Sprache: C

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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/. */

/**
* This class allows you to prefix an existing nsIAsyncInputStream
* with a preloaded block of data known at construction time by wrapping the
* two data sources into a new nsIAsyncInputStream. Readers of the new
* stream initially see the preloaded data and when that has been exhausted
* they automatically read from the wrapped stream.
*
* It is used by nsHttpConnection when it has over buffered while reading from
* the HTTP input socket and accidentally consumed data that belongs to
* a different protocol via the HTTP Upgrade mechanism. That over-buffered
* data is preloaded together with the input socket to form the new input socket
* given to the new protocol handler.
*/

#ifndef nsPreloadedStream_h__
#define nsPreloadedStream_h__

#include "nsIAsyncInputStream.h"
#include "nsCOMPtr.h"
#include "mozilla/Attributes.h"
#include "mozilla/DataMutex.h"

namespace mozilla {
namespace net {

class nsPreloadedStream final : public nsIAsyncInputStream,
                                public nsIInputStreamCallback {
public:
  NS_DECL_THREADSAFE_ISUPPORTS
  NS_DECL_NSIINPUTSTREAM
  NS_DECL_NSIASYNCINPUTSTREAM
  NS_DECL_NSIINPUTSTREAMCALLBACK

  nsPreloadedStream(nsIAsyncInputStream* aStream, const char* data,
                    uint32_t datalen);

private:
  ~nsPreloadedStream();

  nsCOMPtr<nsIAsyncInputStream> mStream;

  char* mBuf;
  uint32_t mOffset;
  uint32_t mLen;

  DataMutex<nsCOMPtr<nsIInputStreamCallback>> mCallback;
};

}  // namespace net
}  // namespace mozilla

#endif

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