IBMDataConversion.h

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//# IBMDataConversion.h: A class with virtual functions to convert IBM format
//# Copyright (C) 1996,1999,2001
//# Associated Universities, Inc. Washington DC, USA.
//#
//# This library is free software; you can redistribute it and/or modify it
//# under the terms of the GNU Library General Public License as published by
//# the Free Software Foundation; either version 2 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 Library General Public
//# License for more details.
//#
//# You should have received a copy of the GNU Library General Public License
//# along with this library; if not, write to the Free Software Foundation,
//# Inc., 675 Massachusetts Ave, Cambridge, MA 02139, USA.
//#
//# Correspondence concerning AIPS++ should be addressed as follows:
//#        Internet email: aips2-request@nrao.edu.
//#        Postal address: AIPS++ Project Office
//#                        National Radio Astronomy Observatory
//#                        520 Edgemont Road
//#                        Charlottesville, VA 22903-2475 USA
//#
//# $Id$

#ifndef CASA_IBMDATACONVERSION_H
#define CASA_IBMDATACONVERSION_H

//# Includes
#include <casacore/casa/aips.h>
#include <casacore/casa/OS/DataConversion.h>


namespace casacore { //# NAMESPACE CASACORE - BEGIN

// <summary>
// A class with virtual functions to convert IBM format.
// </summary>

// <use visibility=export>

// <reviewed reviewer="Friso Olnon" date="1996/11/06" tests="tDataConversion" demos="">
// </reviewed>

// <synopsis>
// This class is a specialization of the abstract base class
// <linkto class=DataConversion>DataConversion</linkto>.
// It contains functions to convert data from/to the old IBM format
// using the static functions in class <linkto class=IBMConversion>
// IBMConversion</linkto>.
// </synopsis>

// <example>
// See example in class <linkto class=DataConversion>DataConversion</linkto>.
// </example>

// <motivation>
// This class is an addition to <linkto class=IBMConversion>IBMConversion
// </linkto> to be able to use the conversion functions in a polymorphic way.
// </motivation>

// <todo asof="$DATE$">
//  <li> Support data type long double.
// </todo>


class IBMDataConversion : public DataConversion
{
public:
    // Construct the object.
    IBMDataConversion();

    virtual ~IBMDataConversion();

    // Convert one value from IBM format to local format.
    // The from and to buffer should not overlap.
    // <note>
    // The char version converts from EBCDIC to ASCII, while the
    // unsigned char version is a simple copy.
    // </note>
    // <group>
    virtual size_t toLocal (char&           to, const void* from) const;
    virtual size_t toLocal (unsigned char&  to, const void* from) const;
    virtual size_t toLocal (short&          to, const void* from) const;
    virtual size_t toLocal (unsigned short& to, const void* from) const;
    virtual size_t toLocal (int&            to, const void* from) const;
    virtual size_t toLocal (unsigned int&   to, const void* from) const;
    virtual size_t toLocal (Int64&          to, const void* from) const;
    virtual size_t toLocal (uInt64&         to, const void* from) const;
    virtual size_t toLocal (float&          to, const void* from) const;
    virtual size_t toLocal (double&         to, const void* from) const;
    // </group>
    
    // Convert nr values from IBM format to local format.
    // The from and to buffer should not overlap.
    // <note>
    // The char version converts from EBCDIC to ASCII, while the
    // unsigned char version is a simple copy.
    // </note>
    // <group>
    virtual size_t toLocal (char*           to, const void* from,
                            size_t nr) const;
    virtual size_t toLocal (unsigned char*  to, const void* from,
                            size_t nr) const;
    virtual size_t toLocal (short*          to, const void* from,
                            size_t nr) const;
    virtual size_t toLocal (unsigned short* to, const void* from,
                            size_t nr) const;
    virtual size_t toLocal (int*            to, const void* from,
                            size_t nr) const;
    virtual size_t toLocal (unsigned int*   to, const void* from,
                            size_t nr) const;
    virtual size_t toLocal (Int64*          to, const void* from,
                            size_t nr) const;
    virtual size_t toLocal (uInt64*         to, const void* from,
                            size_t nr) const;
    virtual size_t toLocal (float*          to, const void* from,
                            size_t nr) const;
    virtual size_t toLocal (double*         to, const void* from,
                            size_t nr) const;
    // </group>

    // Convert one value from local format to IBM format.
    // The from and to buffer should not overlap.
    // <note>
    // The char version converts from ASCII to EBCDIC, while the
    // unsigned char version is a simple copy.
    // </note>
    // <group>
    virtual size_t fromLocal (void* to, char           from) const;
    virtual size_t fromLocal (void* to, unsigned char  from) const;
    virtual size_t fromLocal (void* to, short          from) const;
    virtual size_t fromLocal (void* to, unsigned short from) const;
    virtual size_t fromLocal (void* to, int            from) const;
    virtual size_t fromLocal (void* to, unsigned int   from) const;
    virtual size_t fromLocal (void* to, Int64          from) const;
    virtual size_t fromLocal (void* to, uInt64         from) const;
    virtual size_t fromLocal (void* to, float          from) const;
    virtual size_t fromLocal (void* to, double         from) const;
    // </group>
    
    // Convert nr values from local format to IBM format.
    // The from and to buffer should not overlap.
    // <note>
    // The char version converts from ASCII to EBCDIC, while the
    // unsigned char version is a simple copy.
    // </note>
    // <group>
    virtual size_t fromLocal (void* to, const char*           from,
                              size_t nr) const;
    virtual size_t fromLocal (void* to, const unsigned char*  from,
                              size_t nr) const;
    virtual size_t fromLocal (void* to, const short*          from,
                              size_t nr) const;
    virtual size_t fromLocal (void* to, const unsigned short* from,
                              size_t nr) const;
    virtual size_t fromLocal (void* to, const int*            from,
                              size_t nr) const;
    virtual size_t fromLocal (void* to, const unsigned int*   from,
                              size_t nr) const;
    virtual size_t fromLocal (void* to, const Int64*          from,
                              size_t nr) const;
    virtual size_t fromLocal (void* to, const uInt64*         from,
                              size_t nr) const;
    virtual size_t fromLocal (void* to, const float*          from,
                              size_t nr) const;
    virtual size_t fromLocal (void* to, const double*         from,
                              size_t nr) const;
    // </group>

    // Determine if the data for a data type can be simply copied, thus
    // if no conversion is needed.
    // <group>
    virtual Bool canCopy (const char*) const;
    virtual Bool canCopy (const unsigned char*) const;
    virtual Bool canCopy (const short*) const;
    virtual Bool canCopy (const unsigned short*) const;
    virtual Bool canCopy (const int*) const;
    virtual Bool canCopy (const unsigned int*) const;
    virtual Bool canCopy (const Int64*) const;
    virtual Bool canCopy (const uInt64*) const;
    virtual Bool canCopy (const float*) const;
    virtual Bool canCopy (const double*) const;
    // </group>

    // Get the external size of the data type.
    // <group>
    virtual unsigned int externalSize (const char*) const;
    virtual unsigned int externalSize (const unsigned char*) const;
    virtual unsigned int externalSize (const short*) const;
    virtual unsigned int externalSize (const unsigned short*) const;
    virtual unsigned int externalSize (const int*) const;
    virtual unsigned int externalSize (const unsigned int*) const;
    virtual unsigned int externalSize (const Int64*) const;
    virtual unsigned int externalSize (const uInt64*) const;
    virtual unsigned int externalSize (const float*) const;
    virtual unsigned int externalSize (const double*) const;
    // </group>
};


inline IBMDataConversion::IBMDataConversion()
{}



} //# NAMESPACE CASACORE - END

#endif