symbian/QQrDecoder/zxing/oned/EAN13Reader.cpp

   1 /*
   2  *  EAN13Reader.cpp
   3  *  ZXing
   4  *
   5  *  Created by Lukasz Warchol on 10-01-22.
   6  *  Copyright 2010 ZXing authors All rights reserved.
   7  *
   8  * Licensed under the Apache License, Version 2.0 (the "License");
   9  * you may not use this file except in compliance with the License.
  10  * You may obtain a copy of the License at
  11  *
  12  *      http://www.apache.org/licenses/LICENSE-2.0
  13  *
  14  * Unless required by applicable law or agreed to in writing, software
  15  * distributed under the License is distributed on an "AS IS" BASIS,
  16  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  17  * See the License for the specific language governing permissions and
  18  * limitations under the License.
  19  */
  20
  21 #include "EAN13Reader.h"
  22 #include <zxing/ReaderException.h>
  23
  24 namespace zxing {
  25         namespace oned {
  26
  27                 static const int FIRST_DIGIT_ENCODINGS[10] = {0x00, 0x0B, 0x0D, 0xE, 0x13, 0x19, 0x1C, 0x15, 0x16, 0x1A};
  28
  29
  30                 EAN13Reader::EAN13Reader() { }
  31
  32                 int EAN13Reader::decodeMiddle(Ref<BitArray> row, int startRange[], int startRangeLen, std::string& resultString){
  33                         const int countersLen = 4;
  34                         int counters[countersLen] = { 0, 0, 0, 0 };
  35
  36
  37                         int end = row->getSize();
  38                         int rowOffset = startRange[1];
  39
  40                         int lgPatternFound = 0;
  41
  42                         for (int x = 0; x < 6 && rowOffset < end; x++) {
  43                                 int bestMatch = decodeDigit(row, counters, countersLen, rowOffset, UPC_EAN_PATTERNS_L_AND_G_PATTERNS);
  44                                 resultString.append(1, (char) ('0' + bestMatch % 10));
  45                                 for (int i = 0; i < countersLen; i++) {
  46                                         rowOffset += counters[i];
  47                                 }
  48                                 if (bestMatch >= 10) {
  49                                         lgPatternFound |= 1 << (5 - x);
  50                                 }
  51                         }
  52
  53                         determineFirstDigit(resultString, lgPatternFound);
  54
  55                         int* middleRange = findGuardPattern(row, rowOffset, true, (int*)getMIDDLE_PATTERN(), getMIDDLE_PATTERN_LEN());
  56                         rowOffset = middleRange[1];
  57
  58                         for (int x = 0; x < 6 && rowOffset < end; x++) {
  59                                 int bestMatch = decodeDigit(row, counters, countersLen, rowOffset, UPC_EAN_PATTERNS_L_PATTERNS);
  60                                 resultString.append(1, (char) ('0' + bestMatch));
  61                                 for (int i = 0; i < countersLen; i++) {
  62                                         rowOffset += counters[i];
  63                                 }
  64                         }
  65
  66                         return rowOffset;
  67                 }
  68
  69                 void EAN13Reader::determineFirstDigit(std::string& resultString, int lgPatternFound){
  70                         for (int d = 0; d < 10; d++) {
  71                                 if (lgPatternFound == FIRST_DIGIT_ENCODINGS[d]) {
  72                                         resultString.insert((size_t)0, (size_t)1, (char) ('0' + d));
  73                                         return;
  74                                 }
  75                         }
  76                         throw ReaderException("determineFirstDigit");
  77                 }
  78
  79                 BarcodeFormat EAN13Reader::getBarcodeFormat(){
  80                         return BarcodeFormat_EAN_13;
  81                 }
  82         }
  83 }