DecodedBitStreamParser.h Example File

 #ifndef __DECODED_BIT_STREAM_PARSER_DM_H__
 #define __DECODED_BIT_STREAM_PARSER_DM_H__

 /*
  *  DecodedBitStreamParser.h
  *  zxing
  *
  *  Created by Luiz Silva on 09/02/2010.
  *  Copyright 2010 ZXing authors All rights reserved.
  *
  * Licensed 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.
  */

 #include <string>
 #include <sstream>
 #include <zxing/common/Array.h>
 #include <zxing/common/BitSource.h>
 #include <zxing/common/Counted.h>
 #include <zxing/common/DecoderResult.h>

 namespace zxing {
 namespace datamatrix {

 class DecodedBitStreamParser {
 private:
   static const int PAD_ENCODE = 0;  // Not really an encoding
   static const int ASCII_ENCODE = 1;
   static const int C40_ENCODE = 2;
   static const int TEXT_ENCODE = 3;
   static const int ANSIX12_ENCODE = 4;
   static const int EDIFACT_ENCODE = 5;
   static const int BASE256_ENCODE = 6;

   /**
    * See ISO 16022:2006, Annex C Table C.1
    * The C40 Basic Character Set (*'s used for placeholders for the shift values)
    */
   static const char C40_BASIC_SET_CHARS[];

   static const char C40_SHIFT2_SET_CHARS[];
   /**
    * See ISO 16022:2006, Annex C Table C.2
    * The Text Basic Character Set (*'s used for placeholders for the shift values)
    */
   static const char TEXT_BASIC_SET_CHARS[];

   static const char TEXT_SHIFT3_SET_CHARS[];
   /**
    * See ISO 16022:2006, 5.2.3 and Annex C, Table C.2
    */
   int decodeAsciiSegment(Ref<BitSource> bits, std::ostringstream &result, std::ostringstream &resultTrailer);
   /**
    * See ISO 16022:2006, 5.2.5 and Annex C, Table C.1
    */
   void decodeC40Segment(Ref<BitSource> bits, std::ostringstream &result);
   /**
    * See ISO 16022:2006, 5.2.6 and Annex C, Table C.2
    */
   void decodeTextSegment(Ref<BitSource> bits, std::ostringstream &result);
   /**
    * See ISO 16022:2006, 5.2.7
    */
   void decodeAnsiX12Segment(Ref<BitSource> bits, std::ostringstream &result);
   /**
    * See ISO 16022:2006, 5.2.8 and Annex C Table C.3
    */
   void decodeEdifactSegment(Ref<BitSource> bits, std::ostringstream &result);
   /**
    * See ISO 16022:2006, 5.2.9 and Annex B, B.2
    */
   void decodeBase256Segment(Ref<BitSource> bits, std::ostringstream &result, std::vector<byte> byteSegments);

   void parseTwoBytes(int firstByte, int secondByte, int* result);
   /**
    * See ISO 16022:2006, Annex B, B.2
    */
   char unrandomize255State(int randomizedBase256Codeword,
                            int base256CodewordPosition) {
     int pseudoRandomNumber = ((149 * base256CodewordPosition) % 255) + 1;
     int tempVariable = randomizedBase256Codeword - pseudoRandomNumber;
     return (byte) (tempVariable >= 0 ? tempVariable : (tempVariable + 256));
   };
   void append(std::ostream &ost, const char *bufIn, size_t nIn, const char *src);

 public:
   DecodedBitStreamParser() { };
   Ref<DecoderResult> decode(ArrayRef<byte> bytes);
 };

 }
 }

 #endif // __DECODED_BIT_STREAM_PARSER_DM_H__