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# Base64.hpp

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    00001 /*
    00002  * Licensed to the Apache Software Foundation (ASF) under one or more
    00003  * contributor license agreements.  See the NOTICE file distributed with
    00004  * this work for additional information regarding copyright ownership.
    00005  * The ASF licenses this file to You under the Apache License, Version 2.0
    00006  * (the "License"); you may not use this file except in compliance with
    00007  * the License.  You may obtain a copy of the License at
    00008  *
    00009  *      http://www.apache.org/licenses/LICENSE-2.0
    00010  *
    00011  * Unless required by applicable law or agreed to in writing, software
    00012  * distributed under the License is distributed on an "AS IS" BASIS,
    00013  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    00014  * See the License for the specific language governing permissions and
    00015  * limitations under the License.
    00016  */
    00017
    00018 /*
    00019  * $Id: Base64.hpp 568078 2007-08-21 11:43:25Z amassari $
    00020  */
    00021
    00022 #ifndef BASE64_HPP
    00023 #define BASE64_HPP
    00024
    00025 #include <xercesc/util/XercesDefs.hpp>
    00026 #include <xercesc/util/XMLUniDefs.hpp>
    00027 #include <xercesc/framework/MemoryManager.hpp>
    00028
    00029 XERCES_CPP_NAMESPACE_BEGIN
    00030
    00031 //
    00032 // This class provides encode/decode for RFC 2045 Base64 as
    00033 // defined by RFC 2045, N. Freed and N. Borenstein.
    00034 // RFC 2045: Multipurpose Internet Mail Extensions (MIME)
    00035 // Part One: Format of Internet Message Bodies. Reference
    00036 // 1996 Available at: http://www.ietf.org/rfc/rfc2045.txt
    00037 // This class is used by XML Schema binary format validation
    00038 //
    00039 //
    00040 class  Base64
    00041 {
    00042 public :
    00043
    00044     enum Conformance
    00045     {
    00046         Conf_RFC2045
    00047       , Conf_Schema
    00048     };
    00049
    00051
    00070     static XMLByte* encode(const XMLByte* const inputData
    00071                          , const unsigned int   inputLength
    00072                          , unsigned int*        outputLength
    00073                          , MemoryManager* const memMgr = 0);
    00074
    00097     static XMLByte* decode(
    00098                            const XMLByte*        const   inputData
    00099                          ,       unsigned int*           decodedLength
    00100                          ,       MemoryManager*  const   memMgr = 0
    00101                          ,       Conformance             conform = Conf_RFC2045
    00102                           );
    00103
    00128     static XMLCh* decode(
    00129                          const XMLCh*          const    inputData
    00130                        ,       unsigned int*            decodedLength
    00131                        ,       MemoryManager*  const    memMgr = 0
    00132                        ,       Conformance              conform = Conf_RFC2045
    00133                         );
    00134
    00157     static XMLByte* decodeToXMLByte(
    00158                            const XMLCh*          const   inputData
    00159                          ,       unsigned int*           decodedLength
    00160                          ,       MemoryManager*  const   memMgr = 0
    00161                          ,       Conformance             conform = Conf_RFC2045
    00162                           );
    00175     static int getDataLength(
    00176                              const XMLCh*         const  inputData
    00177                             ,      MemoryManager* const  memMgr = 0
    00178                             ,      Conformance           conform = Conf_RFC2045
    00179                              );
    00180
    00182
    00198     static XMLCh* getCanonicalRepresentation
    00199                   (
    00200                       const XMLCh*          const inputData
    00201                     ,       MemoryManager*  const memMgr = 0
    00202                     ,       Conformance           conform = Conf_RFC2045
    00203                   );
    00204
    00205 private :
    00206
    00207     // -----------------------------------------------------------------------
    00208     //  Helper methods
    00209     // -----------------------------------------------------------------------
    00210
    00211     static XMLByte* decode(
    00212                            const XMLByte*        const   inputData
    00213                          ,       unsigned int*           outputLength
    00214                          ,       XMLByte*&               canRepData
    00215                          ,       MemoryManager*  const   memMgr = 0
    00216                          ,       Conformance             conform = Conf_RFC2045
    00217                           );
    00218
    00219     static void init();
    00220
    00221     static bool isData(const XMLByte& octet);
    00222     static bool isPad(const XMLByte& octet);
    00223
    00224     static XMLByte set1stOctet(const XMLByte&, const XMLByte&);
    00225     static XMLByte set2ndOctet(const XMLByte&, const XMLByte&);
    00226     static XMLByte set3rdOctet(const XMLByte&, const XMLByte&);
    00227
    00228     static void split1stOctet(const XMLByte&, XMLByte&, XMLByte&);
    00229     static void split2ndOctet(const XMLByte&, XMLByte&, XMLByte&);
    00230     static void split3rdOctet(const XMLByte&, XMLByte&, XMLByte&);
    00231
    00232     // -----------------------------------------------------------------------
    00233     //  Unimplemented constructors and operators
    00234     // -----------------------------------------------------------------------
    00235     Base64();
    00236     Base64(const Base64&);
    00237
    00238     // -----------------------------------------------------------------------
    00239     //  Private data members
    00240     //
    00241     //  base64Alphabet
    00242     //     The Base64 alphabet (see RFC 2045).
    00243     //
    00244     //  base64Padding
    00245     //     Padding character (see RFC 2045).
    00246     //
    00247     //  base64Inverse
    00248     //     Table used in decoding base64.
    00249     //
    00250     //  isInitialized
    00251     //     Set once base64Inverse is initalized.
    00252     //
    00253     //  quadsPerLine
    00254     //     Number of quadruplets per one line. The encoded output
    00255     //     stream must be represented in lines of no more
    00256     //     than 19 quadruplets each.
    00257     //
    00258     // -----------------------------------------------------------------------
    00259
    00260     static const XMLByte  base64Alphabet[];
    00261     static const XMLByte  base64Padding;
    00262
    00263     static XMLByte  base64Inverse[];
    00264     static bool  isInitialized;
    00265
    00266     static const unsigned int  quadsPerLine;
    00267 };
    00268
    00269 // -----------------------------------------------------------------------
    00270 //  Helper methods
    00271 // -----------------------------------------------------------------------
    00272 inline bool Base64::isPad(const XMLByte& octet)
    00273 {
    00274     return ( octet == base64Padding );
    00275 }
    00276
    00277 inline XMLByte Base64::set1stOctet(const XMLByte& b1, const XMLByte& b2)
    00278 {
    00279     return (( b1 << 2 ) | ( b2 >> 4 ));
    00280 }
    00281
    00282 inline XMLByte Base64::set2ndOctet(const XMLByte& b2, const XMLByte& b3)
    00283 {
    00284     return (( b2 << 4 ) | ( b3 >> 2 ));
    00285 }
    00286
    00287 inline XMLByte Base64::set3rdOctet(const XMLByte& b3, const XMLByte& b4)
    00288 {
    00289     return (( b3 << 6 ) | b4 );
    00290 }
    00291
    00292 inline void Base64::split1stOctet(const XMLByte& ch, XMLByte& b1, XMLByte& b2) {
    00293     b1 = ch >> 2;
    00294     b2 = ( ch & 0x3 ) << 4;
    00295 }
    00296
    00297 inline void Base64::split2ndOctet(const XMLByte& ch, XMLByte& b2, XMLByte& b3) {
    00298     b2 |= ch >> 4;  // combine with previous value
    00299     b3 = ( ch & 0xf ) << 2;
    00300 }
    00301
    00302 inline void Base64::split3rdOctet(const XMLByte& ch, XMLByte& b3, XMLByte& b4) {
    00303     b3 |= ch >> 6;  // combine with previous value
    00304     b4 = ( ch & 0x3f );
    00305 }
    00306
    00307 XERCES_CPP_NAMESPACE_END
    00308
    00309 #endif

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