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 /*
  * 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.
  */
 
 /*
  * $Id$
  */
 
 #if !defined(XERCESC_INCLUDE_GUARD_XML256TABLETRANSCODER_HPP)
 #define XERCESC_INCLUDE_GUARD_XML256TABLETRANSCODER_HPP
 
 #include <xercesc/util/TransService.hpp>
 
 XERCES_CPP_NAMESPACE_BEGIN
 
 //
 //  This class implements the functionality of a common type of transcoder
 //  for an 8 bit, single byte encoding based on a set of 'to' and 'from'
 //  translation tables. Actual derived classes are trivial and just have to
 //  provide us with pointers to their tables and we do all the work.
 //
 class XMLUTIL_EXPORT XML256TableTranscoder : public XMLTranscoder
 {
 public :
     // -----------------------------------------------------------------------
     //  Public constructors and destructor
     // -----------------------------------------------------------------------
     virtual ~XML256TableTranscoder();
 
 
     // -----------------------------------------------------------------------
     //  The virtual transcoding interface
     // -----------------------------------------------------------------------
     virtual XMLSize_t transcodeFrom
     (
         const   XMLByte* const          srcData
         , const XMLSize_t               srcCount
         ,       XMLCh* const            toFill
         , const XMLSize_t               maxChars
         ,       XMLSize_t&              bytesEaten
         ,       unsigned char* const    charSizes
     );
 
     virtual XMLSize_t transcodeTo
     (
         const   XMLCh* const    srcData
         , const XMLSize_t       srcCount
         ,       XMLByte* const  toFill
         , const XMLSize_t       maxBytes
         ,       XMLSize_t&      charsEaten
         , const UnRepOpts       options
     );
 
     virtual bool canTranscodeTo
     (
         const   unsigned int    toCheck
     );
 
 
 protected :
     // -----------------------------------------------------------------------
     //  Hidden constructors
     // -----------------------------------------------------------------------
     XML256TableTranscoder
     (
         const   XMLCh* const                        encodingName
         , const XMLSize_t                           blockSize
         , const XMLCh* const                        fromTable
         , const XMLTransService::TransRec* const    toTable
         , const XMLSize_t                           toTableSize
         , MemoryManager* const manager = XMLPlatformUtils::fgMemoryManager
     );
 
 
     // -----------------------------------------------------------------------
     //  Protected helper methods
     // -----------------------------------------------------------------------
     XMLByte xlatOneTo
     (
         const   XMLCh       toXlat
     )   const;
 
 
 private :
     // -----------------------------------------------------------------------
     //  Unimplemented constructors and operators
     // -----------------------------------------------------------------------
     XML256TableTranscoder();
     XML256TableTranscoder(const XML256TableTranscoder&);
     XML256TableTranscoder& operator=(const XML256TableTranscoder&);
 
 
     // -----------------------------------------------------------------------
     //  Private data members
     //
     //  fFromTable
     //      This is the 'from' table that we were given during construction.
     //      It is a 256 entry table of XMLCh chars. Each entry is the
     //      Unicode code point for the external encoding point of that value.
     //      So fFromTable[N] is the Unicode translation of code point N of
     //      the source encoding.
     //
     //      We don't own this table, we just refer to it. It is assumed that
     //      the table is static, for performance reasons.
     //
     //  fToSize
     //      The 'to' table is variable sized. This indicates how many records
     //      are in it.
     //
     //  fToTable
     //      This is a variable sized table of TransRec structures. It must
     //      be sorted by the intCh field, i.e. the XMLCh field. It is searched
     //      binarily to find the record for a particular Unicode char. Then
     //      that record's extch field is the translation record.
     //
     //      We don't own this table, we just refer to it. It is assumed that
     //      the table is static, for performance reasons.
     //
     //      NOTE: There may be dups of the extCh field, since there might be
     //      multiple Unicode code points which map to the same external code
     //      point. Normally this won't happen, since the parser assumes that
     //      internalization is normalized, but we have to be prepared to do
     //      the right thing if some client code gives us non-normalized data
     //      itself.
     // -----------------------------------------------------------------------
     const XMLCh*                        fFromTable;
     XMLSize_t                           fToSize;
     const XMLTransService::TransRec*    fToTable;
 };
 
 XERCES_CPP_NAMESPACE_END
 
 #endif

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