content: /*
   * Copyright (C) 2010 ZXing authors
   *
   * 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.
   */
  
  /*
   * These authors would like to acknowledge the Spanish Ministry of Industry,
   * Tourism and Trade, for the support in the project TSI020301-2008-2
   * "PIRAmIDE: Personalizable Interactions with Resources on AmI-enabled
   * Mobile Dynamic Environments", led by Treelogic
   * ( http://www.treelogic.com/ ):
   *
   *   http://www.piramidepse.com/
   */
  
  package com.ailiwean.core.zxing.core.oned.rss.expanded.decoders;
  import com.ailiwean.core.zxing.core.common.BitArray;
  
  /**
   * @author Pablo Orduña, University of Deusto (pablo.orduna@deusto.es)
   * @author Eduardo Castillejo, University of Deusto (eduardo.castillejo@deusto.es)
   */
  abstract class AI01decoder extends AbstractExpandedDecoder {
  
    static final int GTIN_SIZE = 40;
  
    AI01decoder(BitArray information) {
      super(information);
    }
  
    final void encodeCompressedGtin(StringBuilder buf, int currentPos) {
      buf.append("(01)");
      int initialPosition = buf.length();
      buf.append('9');
  
      encodeCompressedGtinWithoutAI(buf, currentPos, initialPosition);
    }
  
    final void encodeCompressedGtinWithoutAI(StringBuilder buf, int currentPos, int initialBufferPosition) {
      for (int i = 0; i < 4; ++i) {
        int currentBlock = this.getGeneralDecoder().extractNumericValueFromBitArray(currentPos + 10 * i, 10);
        if (currentBlock / 100 == 0) {
          buf.append('0');
        }
        if (currentBlock / 10 == 0) {
          buf.append('0');
        }
        buf.append(currentBlock);
      }
  
        appendCheckDigit(buf, initialBufferPosition);
    }
  
    private static void appendCheckDigit(StringBuilder buf, int currentPos) {
      int checkDigit = 0;
      for (int i = 0; i < 13; i++) {
        int digit = buf.charAt(i + currentPos) - '0';
        checkDigit += (i & 0x01) == 0 ? 3 * digit : digit;
      }
  
      checkDigit = 10 - (checkDigit % 10);
      if (checkDigit == 10) {
        checkDigit = 0;
      }
  
      buf.append(checkDigit);
    }
  
  }
  