iDataStream.h

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/*
imagen - Simple object-oriented imaging library
Copyright (C) 2011-2012 Mark D. Procarione

imagen 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 3 of the License, or (at your option) any later version.

imagen 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 General Public License for more details.
*/

#ifndef __IDATASTREAM_H__
#define __IDATASTREAM_H__

#include "imagen.h"

namespace imagen
{
    class iDataStream
    {
        public:
            iDataStream() {};

            virtual ~iDataStream() {};


            virtual bool close() = 0;


                        virtual long read( void *data, long size, long count ) = 0;


            virtual long write( const void *data, long size, long count ) = 0;


            virtual int getc() = 0;


            virtual int putc( int chr ) = 0;


            virtual bool flush() = 0;

            virtual long size() const = 0;

                        virtual long tell() const = 0;


                        virtual bool seek( long offset, iDataSeek origin ) = 0;


                        virtual bool atEnd() const = 0;
    };

    class iFileStream : public iDataStream
    {
        public:
            iFileStream() : file(NULL), sz(0) {}


            iFileStream( const char *filename, iFileMode mode );


            ~iFileStream();


                        bool open( const char *filename, iFileMode mode );


                        bool close();

                        long read( void *data, long size, long count );

            long write( const void *data, long size, long count );

            int getc();

            int putc( int chr );


            bool flush();

            long size() const { return sz; }

                        long tell() const;

                        bool seek( long offset, iDataSeek origin );

                        bool atEnd() const;

        private:
            FILE *file;
            long sz;
    };

        class iMemoryStream : public iDataStream
        {
                public:
                        iMemoryStream() { data = NULL; sz = 0; position = 0; delOnClose = false; }


                        iMemoryStream( void *bdata, long bsize );

                        ~iMemoryStream();


            void deleteOnClose( bool del ) { delOnClose = del; }


                        bool open( void *bdata, long bsize );


                        bool close();

                        long read( void *bdata, long size, long count );

                        long write( const void *bdata, long size, long count );

            int getc();

            int putc( int chr );


            bool flush();

            long size() const { return sz; }

                        long tell() const { return position; }

                        bool seek( long offset, iDataSeek origin );

                        bool atEnd() const;

        private:
                        void *data;
                        long sz;
                        long position;
                        bool delOnClose;
        };
}

#endif // __IDATASTREAM_H__