cpp/core/src/zxing/oned/EAN8Reader.cpp

   1 /*
   2  *  EAN8Reader.cpp
   3  *  ZXing
   4  *
   5  *  Created by Lukasz Warchol on 10-01-25.
   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 "EAN8Reader.h"
  22 #include <zxing/ReaderException.h>
  23
  24 namespace zxing {
  25         namespace oned {
  26
  27                 EAN8Reader::EAN8Reader(){ }
  28
  29                 int EAN8Reader::decodeMiddle(Ref<BitArray> row, int startRange[], int startRangeLen, std::string& resultString){
  30                         const int countersLen = 4;
  31                         int counters[countersLen] = { 0, 0, 0, 0 };
  32
  33                         int end = row->getSize();
  34                         int rowOffset = startRange[1];
  35
  36                         for (int x = 0; x < 4 && rowOffset < end; x++) {
  37                                 int bestMatch = decodeDigit(row, counters, countersLen, rowOffset, UPC_EAN_PATTERNS_L_PATTERNS);
  38                                 resultString.append(1, (char) ('0' + bestMatch));
  39                                 for (int i = 0; i < countersLen; i++) {
  40                                         rowOffset += counters[i];
  41                                 }
  42                         }
  43
  44                         int* middleRange = findGuardPattern(row, rowOffset, true, (int*)getMIDDLE_PATTERN(), getMIDDLE_PATTERN_LEN());
  45                         rowOffset = middleRange[1];
  46
  47                         for (int x = 0; x < 4 && rowOffset < end; x++) {
  48                                 int bestMatch = decodeDigit(row, counters, countersLen, rowOffset, UPC_EAN_PATTERNS_L_PATTERNS);
  49                                 resultString.append(1, (char) ('0' + bestMatch));
  50                                 for (int i = 0; i < countersLen; i++) {
  51                                         rowOffset += counters[i];
  52                                 }
  53                         }
  54
  55                         return rowOffset;
  56                 }
  57
  58                 BarcodeFormat EAN8Reader::getBarcodeFormat(){
  59                         return BarcodeFormat_EAN_8;
  60                 }
  61         }
  62 }