csharp/oned/EAN8Reader.cs

   1 /*\r
   2 * Copyright 2008 ZXing authors\r
   3 *\r
   4 * Licensed under the Apache License, Version 2.0 (the "License");\r
   5 * you may not use this file except in compliance with the License.\r
   6 * You may obtain a copy of the License at\r
   7 *\r
   8 *      http://www.apache.org/licenses/LICENSE-2.0\r
   9 *\r
  10 * Unless required by applicable law or agreed to in writing, software\r
  11 * distributed under the License is distributed on an "AS IS" BASIS,\r
  12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r
  13 * See the License for the specific language governing permissions and\r
  14 * limitations under the License.\r
  15 */\r
  16 using System;\r
  17 using BarcodeFormat = com.google.zxing.BarcodeFormat;\r
  18 using ReaderException = com.google.zxing.ReaderException;\r
  19 using BitArray = com.google.zxing.common.BitArray;\r
  20 namespace com.google.zxing.oned\r
  21 {\r
  22         \r
  23         /// <summary> <p>Implements decoding of the EAN-8 format.</p>\r
  24         /// \r
  25         /// </summary>\r
  26         /// <author>  Sean Owen\r
  27         /// </author>\r
  28         /// <author>www.Redivivus.in (suraj.supekar@redivivus.in) - Ported from ZXING Java Source \r
  29         /// </author>\r
  30         public sealed class EAN8Reader:UPCEANReader\r
  31         {\r
  32                 override internal BarcodeFormat BarcodeFormat\r
  33                 {\r
  34                         get\r
  35                         {\r
  36                                 return BarcodeFormat.EAN_8;\r
  37                         }\r
  38                         \r
  39                 }\r
  40                 \r
  41                 //UPGRADE_NOTE: Final was removed from the declaration of 'decodeMiddleCounters '. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1003'"\r
  42                 private int[] decodeMiddleCounters;\r
  43                 \r
  44                 public EAN8Reader()\r
  45                 {\r
  46                         decodeMiddleCounters = new int[4];\r
  47                 }\r
  48                 \r
  49                 protected internal override int decodeMiddle(BitArray row, int[] startRange, System.Text.StringBuilder result)\r
  50                 {\r
  51                         int[] counters = decodeMiddleCounters;\r
  52                         counters[0] = 0;\r
  53                         counters[1] = 0;\r
  54                         counters[2] = 0;\r
  55                         counters[3] = 0;\r
  56                         int end = row.Size;\r
  57                         int rowOffset = startRange[1];\r
  58                         \r
  59                         for (int x = 0; x < 4 && rowOffset < end; x++)\r
  60                         {\r
  61                                 int bestMatch = decodeDigit(row, counters, rowOffset, L_PATTERNS);\r
  62                                 result.Append((char) ('0' + bestMatch));\r
  63                                 for (int i = 0; i < counters.Length; i++)\r
  64                                 {\r
  65                                         rowOffset += counters[i];\r
  66                                 }\r
  67                         }\r
  68                         \r
  69                         int[] middleRange = findGuardPattern(row, rowOffset, true, MIDDLE_PATTERN);\r
  70                         rowOffset = middleRange[1];\r
  71                         \r
  72                         for (int x = 0; x < 4 && rowOffset < end; x++)\r
  73                         {\r
  74                                 int bestMatch = decodeDigit(row, counters, rowOffset, L_PATTERNS);\r
  75                                 result.Append((char) ('0' + bestMatch));\r
  76                                 for (int i = 0; i < counters.Length; i++)\r
  77                                 {\r
  78                                         rowOffset += counters[i];\r
  79                                 }\r
  80                         }\r
  81                         \r
  82                         return rowOffset;\r
  83                 }\r
  84         }\r
  85 }