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ImfStdIO.h

///////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2004, Industrial Light & Magic, a division of Lucas
// Digital Ltd. LLC
// 
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
// *       Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// *       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.
// *       Neither the name of Industrial Light & Magic nor the names of
// its contributors may be used to endorse or promote products derived
// from this software without specific prior written permission. 
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "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 COPYRIGHT
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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///////////////////////////////////////////////////////////////////////////


#ifndef INCLUDED_IMF_STD_IO_H
#define INCLUDED_IMF_STD_IO_H

//-----------------------------------------------------------------------------
//
//    Low-level file input and output for OpenEXR
//    based on C++ standard iostreams.
//
//-----------------------------------------------------------------------------

#include <ImfIO.h>
#include <fstream>
#include <sstream>

namespace Imf {

//-------------------------------------------
// class StdIFStream -- an implementation of
// class IStream based on class std::ifstream
//-------------------------------------------

class StdIFStream: public IStream
{
  public:

    //-------------------------------------------------------
    // A constructor that opens the file with the given name.
    // The destructor will close the file.
    //-------------------------------------------------------

    StdIFStream (const char fileName[]);

    
    //---------------------------------------------------------
    // A constructor that uses a std::ifstream that has already
    // been opened by the caller.  The StdIFStream's destructor
    // will not close the std::ifstream.
    //---------------------------------------------------------

    StdIFStream (std::ifstream &is, const char fileName[]);


    virtual ~StdIFStream ();

    virtual bool  read (char c[/*n*/], int n);
    virtual Int64 tellg ();
    virtual void  seekg (Int64 pos);
    virtual void  clear ();

  private:

    std::ifstream *     _is;
    bool          _deleteStream;
};


//-------------------------------------------
// class StdOFStream -- an implementation of
// class OStream based on class std::ofstream
//-------------------------------------------

class StdOFStream: public OStream
{
  public:

    //-------------------------------------------------------
    // A constructor that opens the file with the given name.
    // The destructor will close the file.
    //-------------------------------------------------------

    StdOFStream (const char fileName[]);
    

    //---------------------------------------------------------
    // A constructor that uses a std::ofstream that has already
    // been opened by the caller.  The StdOFStream's destructor
    // will not close the std::ofstream.
    //---------------------------------------------------------

    StdOFStream (std::ofstream &os, const char fileName[]);


    virtual ~StdOFStream ();

    virtual void  write (const char c[/*n*/], int n);
    virtual Int64 tellp ();
    virtual void  seekp (Int64 pos);

  private:

    std::ofstream *     _os;
    bool          _deleteStream;
};


//------------------------------------------------
// class StdOSStream -- an implementation of class
// OStream, based on class std::ostringstream
//------------------------------------------------

class StdOSStream: public OStream
{
  public:

    StdOSStream ();

    virtual void  write (const char c[/*n*/], int n);
    virtual Int64 tellp ();
    virtual void  seekp (Int64 pos);

    std::string         str () const {return _os.str();}

  private:

    std::ostringstream  _os;
};


} // namespace Imf

#endif

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