zxing-js/library

import AI01decoder from './AI01decoder';
import BitArray from '../../../../common/BitArray';
import NotFoundException from '../../../../NotFoundException';
import StringBuilder from '../../../../util/StringBuilder';

export default class AI01393xDecoder extends AI01decoder {
  private static readonly HEADER_SIZE = 5 + 1 + 2;
  private static readonly LAST_DIGIT_SIZE = 2;
  private static readonly FIRST_THREE_DIGITS_SIZE = 10;

  constructor(information: BitArray) {
    super(information);
  }

  public parseInformation(): string {
    if (
      this.getInformation().getSize() <
      AI01393xDecoder.HEADER_SIZE + AI01decoder.GTIN_SIZE
    ) {
      throw new NotFoundException();
    }

    let buf = new StringBuilder();

    this.encodeCompressedGtin(buf, AI01393xDecoder.HEADER_SIZE);

    let lastAIdigit = this.getGeneralDecoder().extractNumericValueFromBitArray(
      AI01393xDecoder.HEADER_SIZE + AI01decoder.GTIN_SIZE,
      AI01393xDecoder.LAST_DIGIT_SIZE
    );

    buf.append('(393');
    buf.append(lastAIdigit);
    buf.append(')');

    let firstThreeDigits =
      this.getGeneralDecoder().extractNumericValueFromBitArray(
        AI01393xDecoder.HEADER_SIZE +
          AI01decoder.GTIN_SIZE +
          AI01393xDecoder.LAST_DIGIT_SIZE,
        AI01393xDecoder.FIRST_THREE_DIGITS_SIZE
      );
    if (firstThreeDigits / 100 === 0) {
      buf.append('0');
    }
    if (firstThreeDigits / 10 === 0) {
      buf.append('0');
    }
    buf.append(firstThreeDigits);

    let generalInformation = this.getGeneralDecoder().decodeGeneralPurposeField(
      AI01393xDecoder.HEADER_SIZE +
        AI01decoder.GTIN_SIZE +
        AI01393xDecoder.LAST_DIGIT_SIZE +
        AI01393xDecoder.FIRST_THREE_DIGITS_SIZE,
      null
    );
    buf.append(generalInformation.getNewString());

    return buf.toString();
  }
}