/**
 * PANDA 3D SOFTWARE
 * Copyright (c) Carnegie Mellon University.  All rights reserved.
 *
 * All use of this software is subject to the terms of the revised BSD
 * license.  You should have received a copy of this license along
 * with this source code in a file named "LICENSE."
 *
 * @file bioStreamBuf.h
 * @author drose
 * @date 2002-09-25
 */

#ifndef BIOSTREAMBUF_H
#define BIOSTREAMBUF_H

#include "pandabase.h"

// This module is not compiled if OpenSSL is not available.
#ifdef HAVE_OPENSSL

#include "bioPtr.h"
#include "pointerTo.h"

/**
 * The streambuf object that implements IBioStream.
 */
class EXPCL_PANDA_DOWNLOADER BioStreamBuf : public std::streambuf {
public:
  BioStreamBuf();
  virtual ~BioStreamBuf();

  void open(BioPtr *source);
  void close();

protected:
  virtual int overflow(int c);
  virtual int sync();
  virtual int underflow();

private:
  size_t write_chars(const char *start, size_t length);

  PT(BioPtr) _source;
  bool _read_open;
  bool _write_open;
  char *_buffer;

  friend class IBioStream;
  friend class OBioStream;
  friend class BioStream;
};

#endif  // HAVE_OPENSSL

#endif