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/*
* libjingle
* Copyright 2004--2006, Google Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef TALK_APP_STREAMUTILS_H__
#define TALK_APP_STREAMUTILS_H__
#include "talk/base/sigslot.h"
#include "talk/base/stream.h"
///////////////////////////////////////////////////////////////////////////////
// StreamRelay - acts as an intermediary between two asynchronous streams,
// reading from one stream and writing to the other, using a pre-specified
// amount of buffering in both directions.
///////////////////////////////////////////////////////////////////////////////
class StreamRelay : public sigslot::has_slots<> {
public:
StreamRelay(talk_base::StreamInterface* s1,
talk_base::StreamInterface* s2, size_t buffer_size);
virtual ~StreamRelay();
void Circulate(); // Simulate events to get things flowing
void Close();
sigslot::signal2<StreamRelay*, int> SignalClosed;
private:
inline int Index(talk_base::StreamInterface* s) const
{ return (s == dir_[1].stream); }
inline int Complement(int index) const { return (1-index); }
bool Flow(int read_index, int* error);
void OnEvent(talk_base::StreamInterface* stream, int events, int error);
struct Direction {
talk_base::StreamInterface* stream;
char* buffer;
size_t data_len;
};
Direction dir_[2];
size_t buffer_size_;
};
///////////////////////////////////////////////////////////////////////////////
// StreamCounter - counts the number of bytes which are transferred in either
// direction.
///////////////////////////////////////////////////////////////////////////////
class StreamCounter : public talk_base::StreamAdapterInterface {
public:
explicit StreamCounter(talk_base::StreamInterface* stream);
inline void ResetByteCount() { count_ = 0; }
inline size_t GetByteCount() const { return count_; }
sigslot::signal1<size_t> SignalUpdateByteCount;
// StreamAdapterInterface
virtual talk_base::StreamResult Read(void* buffer, size_t buffer_len,
size_t* read, int* error);
virtual talk_base::StreamResult Write(const void* data, size_t data_len,
size_t* written, int* error);
private:
size_t count_;
};
///////////////////////////////////////////////////////////////////////////////
#endif // TALK_APP_STREAMUTILS_H__
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