cpp/core/src/zxing/oned/UPCEANReader.h

   1 #ifndef __UPC_EAN_READER_H__
   2 #define __UPC_EAN_READER_H__
   3
   4 /*
   5  *  UPCEANReader.h
   6  *  ZXing
   7  *
   8  *  Copyright 2010 ZXing authors All rights reserved.
   9  *
  10  * Licensed under the Apache License, Version 2.0 (the "License");
  11  * you may not use this file except in compliance with the License.
  12  * You may obtain a copy of the License at
  13  *
  14  *      http://www.apache.org/licenses/LICENSE-2.0
  15  *
  16  * Unless required by applicable law or agreed to in writing, software
  17  * distributed under the License is distributed on an "AS IS" BASIS,
  18  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  19  * See the License for the specific language governing permissions and
  20  * limitations under the License.
  21  */
  22
  23 #include <zxing/oned/OneDReader.h>
  24 #include <zxing/common/BitArray.h>
  25 #include <zxing/Result.h>
  26
  27 typedef enum UPC_EAN_PATTERNS {
  28         UPC_EAN_PATTERNS_L_PATTERNS = 0,
  29         UPC_EAN_PATTERNS_L_AND_G_PATTERNS
  30 } UPC_EAN_PATTERNS;
  31
  32 namespace zxing {
  33         namespace oned {
  34                 class UPCEANReader : public OneDReader {
  35
  36                 private:
  37                         static const unsigned int MAX_AVG_VARIANCE = (unsigned int) (PATTERN_MATCH_RESULT_SCALE_FACTOR * 0.42f);
  38                         static const int MAX_INDIVIDUAL_VARIANCE = (int) (PATTERN_MATCH_RESULT_SCALE_FACTOR * 0.7f);
  39
  40                         static int* findStartGuardPattern(Ref<BitArray> row);
  41
  42                         virtual int* decodeEnd(Ref<BitArray> row, int endStart);
  43
  44                         static bool checkStandardUPCEANChecksum(std::string s);
  45                 protected:
  46                         static int* findGuardPattern(Ref<BitArray> row, int rowOffset, bool whiteFirst,
  47                             const int pattern[], int patternLen);
  48
  49                         virtual const int getMIDDLE_PATTERN_LEN();
  50                         virtual const int* getMIDDLE_PATTERN();
  51
  52                 public:
  53                         UPCEANReader();
  54
  55       // Returns < 0 on failure, >= 0 on success.
  56                         virtual int decodeMiddle(Ref<BitArray> row, int startRange[], int startRangeLen,
  57                             std::string& resultString) = 0;
  58
  59                         Ref<Result> decodeRow(int rowNumber, Ref<BitArray> row);
  60
  61                         // TODO(dswitkin): Should this be virtual so that UPCAReader can override it?
  62                         Ref<Result> decodeRow(int rowNumber, Ref<BitArray> row, int startGuardRange[]);
  63
  64       // Returns < 0 on failure, >= 0 on success.
  65                         static int decodeDigit(Ref<BitArray> row, int counters[], int countersLen, int rowOffset,
  66                             UPC_EAN_PATTERNS patternType);
  67
  68                         virtual bool checkChecksum(std::string s);
  69
  70                         virtual BarcodeFormat getBarcodeFormat() = 0;
  71                         virtual ~UPCEANReader();
  72                 };
  73         }
  74 }
  75
  76 #endif