FileByteSource.h

/*                                              -*- mode:C++ -*-
  FileByteSource.h MFM ByteSource backed by a file
  Copyright (C) 2014 The Regents of the University of New Mexico.  All rights reserved.

  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.

  This library is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  Lesser General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this library; if not, write to the Free Software
  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
  USA
*/

#ifndef FILEBYTESOURCE_H
#define FILEBYTESOURCE_H

#include <stdio.h>
#include "ByteSource.h"

namespace MFM
{
  class FileByteSource : public ByteSource
  {
  private:
    FILE* m_fp;

  public:
    FileByteSource() :
      ByteSource(),
      m_fp(NULL)
    { }

    FileByteSource(const char* filename) :
      ByteSource(),
      m_fp(NULL)
    {
      Open(filename);
    }

    void Open(const char* filename)
    {
      if(!m_fp)
      {
        m_fp = fopen(filename, "r");
      }
    }

    bool IsOpen()
    {
      return m_fp != NULL;
    }

    void Close()
    {
      if(m_fp)
      {
        fclose(m_fp);
        m_fp = NULL;
      }
    }

    virtual int ReadByte()
    {
      if (!m_fp)
      {
        FAIL(ILLEGAL_STATE);
      }
      return fgetc(m_fp);
    }
  };
}

#endif /* FILEBYTESOURCE_H */