zxing-js/library

/*
 * Copyright 2009 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.
 */

// package com.google.zxing.pdf417;

// import com.google.zxing.BarcodeFormat;
import BarcodeFormat from '../BarcodeFormat';
// import com.google.zxing.BinaryBitmap;
import BinaryBitmap from '../BinaryBitmap';
// import com.google.zxing.ChecksumException;
import ChecksumException from '../ChecksumException';
// import com.google.zxing.DecodeHintType;
import DecodeHintType from '../DecodeHintType';
// import com.google.zxing.FormatException;
import FormatException from '../FormatException';
// import com.google.zxing.NotFoundException;
import NotFoundException from '../NotFoundException';
// import com.google.zxing.Reader;
import Reader from '../Reader';
// import com.google.zxing.Result;
import Result from '../Result';
// import com.google.zxing.ResultMetadataType;
// import com.google.zxing.ResultPoint;
import ResultPoint from '../ResultPoint';
// import com.google.zxing.common.DecoderResult;
// import com.google.zxing.multi.MultipleBarcodeReader;
// import com.google.zxing.pdf417.decoder.PDF417ScanningDecoder;
// import com.google.zxing.pdf417.detector.Detector;
// import com.google.zxing.pdf417.detector.PDF417DetectorResult;

import PDF417Common from './PDF417Common';
import Integer from '../util/Integer';
import PDF417ResultMetadata from './PDF417ResultMetadata';
import ResultMetadataType from '../ResultMetadataType';
import MultipleBarcodeReader from '../multi/MultipleBarcodeReader';
import Detector from './detector/Detector';
import PDF417ScanningDecoder from './decoder/PDF417ScanningDecoder';

import { int } from '../../customTypings';


// import java.util.ArrayList;
// import java.util.List;
// import java.util.Map;

/**
 * This implementation can detect and decode PDF417 codes in an image.
 *
 * @author Guenther Grau
 */
export default /*public final*/ class PDF417Reader implements Reader, MultipleBarcodeReader {

  // private static /*final Result[]*/ EMPTY_RESULT_ARRAY: Result[] = new Result([0]);

  /**
   * Locates and decodes a PDF417 code in an image.
   *
   * @return a String representing the content encoded by the PDF417 code
   * @throws NotFoundException if a PDF417 code cannot be found,
   * @throws FormatException if a PDF417 cannot be decoded
   * @throws ChecksumException
   */
  // @Override
  public decode(image: BinaryBitmap, hints: Map<DecodeHintType, any> = null): Result {
    let result = PDF417Reader.decode(image, hints, false);
    if (result == null || result.length === 0 || result[0] == null) {
      throw NotFoundException.getNotFoundInstance();
    }
    return result[0];
  }

  /**
   *
   * @param BinaryBitmap
   * @param image
   * @throws NotFoundException
   */
  //   @Override
  public decodeMultiple(image: BinaryBitmap, hints: Map<DecodeHintType, any> = null): Result[] {
    try {
      return PDF417Reader.decode(image, hints, true);
    } catch (ignored) {
      if (ignored instanceof FormatException || ignored instanceof ChecksumException) {
        throw NotFoundException.getNotFoundInstance();
      }

      throw ignored;
    }
  }

  /**
   *
   * @param image
   * @param hints
   * @param multiple
   *
   * @throws NotFoundException
   * @throws FormatExceptionß
   * @throws ChecksumException
   */
  private static decode(image: BinaryBitmap, hints: Map<DecodeHintType, any>, multiple: boolean) {
    const results = new Array<Result>();
    const detectorResult = Detector.detectMultiple(image, hints, multiple);
    for (const points of detectorResult.getPoints()) {
      const decoderResult = PDF417ScanningDecoder.decode(detectorResult.getBits(), points[4], points[5],
        points[6], points[7], PDF417Reader.getMinCodewordWidth(points), PDF417Reader.getMaxCodewordWidth(points));
      const result = new Result(decoderResult.getText(), decoderResult.getRawBytes(), undefined, points, BarcodeFormat.PDF_417);
      result.putMetadata(ResultMetadataType.ERROR_CORRECTION_LEVEL, decoderResult.getECLevel());
      const pdf417ResultMetadata: PDF417ResultMetadata = decoderResult.getOther();
      if (pdf417ResultMetadata != null) {
        result.putMetadata(ResultMetadataType.PDF417_EXTRA_METADATA, pdf417ResultMetadata);
      }
      results.push(result);
    }
    return results.map(x => x);
  }

  private static getMaxWidth(p1: ResultPoint, p2: ResultPoint): number /*int*/ {
    if (p1 == null || p2 == null) {
      return 0;
    }
    return <int> Math.trunc(Math.abs(p1.getX() - p2.getX()));
  }

  private static getMinWidth(p1: ResultPoint, p2: ResultPoint): number /*int*/ {
    if (p1 == null || p2 == null) {
      return Integer.MAX_VALUE;
    }
    return <int> Math.trunc(Math.abs(p1.getX() - p2.getX()));
  }

  private static getMaxCodewordWidth(p: ResultPoint[]): number /*int*/ {
    return Math.floor(Math.max(
      Math.max(PDF417Reader.getMaxWidth(p[0], p[4]), PDF417Reader.getMaxWidth(p[6], p[2]) * PDF417Common.MODULES_IN_CODEWORD /
        PDF417Common.MODULES_IN_STOP_PATTERN),
      Math.max(PDF417Reader.getMaxWidth(p[1], p[5]), PDF417Reader.getMaxWidth(p[7], p[3]) * PDF417Common.MODULES_IN_CODEWORD /
        PDF417Common.MODULES_IN_STOP_PATTERN)));
  }

  private static getMinCodewordWidth(p: ResultPoint[]): number /*int*/ {
    return Math.floor(Math.min(
      Math.min(PDF417Reader.getMinWidth(p[0], p[4]), PDF417Reader.getMinWidth(p[6], p[2]) * PDF417Common.MODULES_IN_CODEWORD /
        PDF417Common.MODULES_IN_STOP_PATTERN),
      Math.min(PDF417Reader.getMinWidth(p[1], p[5]), PDF417Reader.getMinWidth(p[7], p[3]) * PDF417Common.MODULES_IN_CODEWORD /
        PDF417Common.MODULES_IN_STOP_PATTERN)));
  }

  // @Override
  public reset(): void {
    // nothing needs to be reset
  }

}