src/xercesc/util/XMLUCS4Transcoder.hpp

/*
 * The Apache Software License, Version 1.1
 * 
 * Copyright (c) 1999-2000 The Apache Software Foundation.  All rights
 * reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 * 
 * 2. 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.
 * 
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:  
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 * 
 * 4. The names "Xerces" and "Apache Software Foundation" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written 
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 * 
 * 5. Products derived from this software may not be called "Apache",
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 * 
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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 * SUCH DAMAGE.
 * ====================================================================
 * 
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation, and was
 * originally based on software copyright (c) 1999, International
 * Business Machines, Inc., http://www.ibm.com .  For more information
 * on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */

#ifndef XMLUCS4TRANSCODER_HPP
#define XMLUCS4TRANSCODER_HPP

#include <xercesc/util/XercesDefs.hpp>
#include <xercesc/util/TransService.hpp>


//
//  This class provides an implementation of the XMLTranscoder interface
//  for a simple UCS4 transcoder. The parser does some encodings
//  intrinsically without depending upon external transcoding services.
//  To make everything more orthagonal, we implement these internal
//  transcoders using the same transcoder abstraction as the pluggable
//  transcoding services do.
//
class XMLUTIL_EXPORT XMLUCS4Transcoder : public XMLTranscoder
{
public :
    // -----------------------------------------------------------------------
    //  Public constructors and destructor
    // -----------------------------------------------------------------------
    XMLUCS4Transcoder
    (
        const   XMLCh* const    encodingName
        , const unsigned int    blockSize
        , const bool            swapped
    );

    virtual ~XMLUCS4Transcoder();


    // -----------------------------------------------------------------------
    //  Implementation of the XMLTranscoder interface
    // -----------------------------------------------------------------------
    virtual unsigned int transcodeFrom
    (
        const   XMLByte* const          srcData
        , const unsigned int            srcCount
        ,       XMLCh* const            toFill
        , const unsigned int            maxChars
        ,       unsigned int&           bytesEaten
        ,       unsigned char* const    charSizes
    );

    virtual unsigned int transcodeTo
    (
        const   XMLCh* const    srcData
        , const unsigned int    srcCount
        ,       XMLByte* const  toFill
        , const unsigned int    maxBytes
        ,       unsigned int&   charsEaten
        , const UnRepOpts       options
    );

    virtual bool canTranscodeTo
    (
        const   unsigned int    toCheck
    )   const;


private :
    // -----------------------------------------------------------------------
    //  Unimplemented constructors and operators
    // -----------------------------------------------------------------------
    XMLUCS4Transcoder(const XMLUCS4Transcoder&);
    void operator=(const XMLUCS4Transcoder&);


    // -----------------------------------------------------------------------
    //  Private data members
    //
    //  fSwapped
    //      This tells us if our input is going to be in the same endianess
    //      as the local host or swapped.
    // -----------------------------------------------------------------------
    bool    fSwapped;
};

#endif