/**
 * 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 stringStreamBuf.h
 * @author drose
 * @date 2007-07-02
 */

#ifndef STRINGSTREAMBUF_H
#define STRINGSTREAMBUF_H

#include "pandabase.h"
#include "vector_uchar.h"

/**
 * Used by StringStream to implement an stream that reads from and/or writes
 * to a memory buffer, whose contents can be appended to or extracted at any
 * time by application code.
 */
class EXPCL_PANDA_DOWNLOADER StringStreamBuf : public std::streambuf {
public:
  StringStreamBuf();
  virtual ~StringStreamBuf();

  void clear();

  INLINE void swap_data(vector_uchar &data);
  INLINE const vector_uchar &get_data() const;

  size_t read_chars(char *start, size_t length);
  void write_chars(const char *start, size_t length);

protected:
  virtual std::streampos seekoff(std::streamoff off, ios_seekdir dir, ios_openmode which);
  virtual std::streampos seekpos(std::streampos pos, ios_openmode which);

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

private:
  vector_uchar _data;
  char *_buffer;
  size_t _ppos;
  size_t _gpos;
};

#include "stringStreamBuf.I"

#endif