/*

 * Licensed to the Apache Software Foundation (ASF) under one or more

 * contributor license agreements.  See the NOTICE file distributed with

 * this work for additional information regarding copyright ownership.

 * The ASF licenses this file to You under the Apache License, Version 2.0

 * (the "License"); you may not use this file except in compliance with

 * the License.  You may obtain a copy of the License at

 * 

 *      http://www.apache.org/licenses/LICENSE-2.0

 * 

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

#ifndef XMLUTF8TRANSCODER_HPP

#define XMLUTF8TRANSCODER_HPP

#include <xercesc/util/XercesDefs.hpp>

#include <xercesc/util/TransService.hpp>

#include <xercesc/util/UTFDataFormatException.hpp>

XERCES_CPP_NAMESPACE_BEGIN

//

//  This class provides an implementation of the XMLTranscoder interface

//  for a simple UTF8 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 XMLUTF8Transcoder : public XMLTranscoder

{

public :

    // -----------------------------------------------------------------------

    //  Public constructors and destructor

    // -----------------------------------------------------------------------

    XMLUTF8Transcoder

    (

        const   XMLCh* const    encodingName

        , const unsigned int    blockSize

        , MemoryManager* const manager = XMLPlatformUtils::fgMemoryManager

    );

    virtual ~XMLUTF8Transcoder();

    // -----------------------------------------------------------------------

    //  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 :

    inline void checkTrailingBytes(

                                    const XMLByte      toCheck

                                  , const unsigned int trailingBytes

                                  , const unsigned int position       

                                  ) const;

private :

    // -----------------------------------------------------------------------

    //  Unimplemented constructors and operators

    // -----------------------------------------------------------------------

    XMLUTF8Transcoder(const XMLUTF8Transcoder&);

    XMLUTF8Transcoder& operator=(const XMLUTF8Transcoder&);

};

inline 

void XMLUTF8Transcoder::checkTrailingBytes(const XMLByte      toCheck

                                          , const unsigned int trailingBytes

                                          , const unsigned int position) const

{

    if((toCheck & 0xC0) != 0x80) 

    {

        char len[2]  = {(char)(trailingBytes+0x31), 0};

        char pos[2]  = {(char)(position+0x31), 0};

        char byte[2] = {toCheck,0};

        ThrowXMLwithMemMgr3(UTFDataFormatException, XMLExcepts::UTF8_FormatError, pos, byte, len, getMemoryManager());

    }

}

XERCES_CPP_NAMESPACE_END

#endif