Code39ExtendedModeTestCase.java

/*
 * Copyright 2017 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.oned;

import org.junit.Assert;
import org.junit.Test;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.BitArray;
import com.google.zxing.ChecksumException;
import com.google.zxing.FormatException;
import com.google.zxing.NotFoundException;
import com.google.zxing.Result;

/**
 * @author Michael Jahn
 */
public final class Code39ExtendedModeTestCase extends Assert {

  @SuppressWarnings("checkstyle:lineLength")
  @Test
  public void testDecodeExtendedMode() throws FormatException, ChecksumException, NotFoundException {
    doTest("\u0000\u0001\u0002\u0003\u0004\u0005\u0006\u0007\b\t\n\u000b\f\r\u000e\u000f\u0010\u0011\u0012\u0013\u0014\u0015\u0016\u0017\u0018\u0019\u001a\u001b\u001c\u001d\u001e\u001f",
           "000001001011011010101001001001011001010101101001001001010110101001011010010010010101011010010110100100100101011011010010101001001001010101011001011010010010010101101011001010100100100101010110110010101001001001010101010011011010010010010101101010011010100100100101010110100110101001001001010101011001101010010010010101101010100110100100100101010110101001101001001001010110110101001010010010010101010110100110100100100101011010110100101001001001010101101101001010010010010101010101100110100100100101011010101100101001001001010101101011001010010010010101010110110010100100100101011001010101101001001001010100110101011010010010010101100110101010100100100101010010110101101001001001010110010110101010010010010101001101101010101001001001011010100101101010010010010101101001011010100100100101101101001010101001001001010101100101101010010010010110101100101010010110110100000");
    doTest(" !\"#$%&'()*+,-./0123456789:;<=>?",
           "00000100101101101010011010110101001001010010110101001011010010010100101011010010110100100101001011011010010101001001010010101011001011010010010100101101011001010100100101001010110110010101001001010010101010011011010010010100101101010011010100100101001010110100110101001001010010101011001101010010010100101101010100110100100101001010110101001101001010110110110010101101010010010100101101011010010101001101101011010010101101011001010110110110010101010100110101101101001101010101100110101010100101101101101001011010101100101101010010010100101001101101010101001001001010110110010101010010010010101010011011010100100100101101010011010101001001001010110100110101010010010010101011001101010010110110100000");
    doTest("@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_",
           "000010010110110101010010010010100110101011011010100101101011010010110110110100101010101100101101101011001010101101100101010101001101101101010011010101101001101010101100110101101010100110101101010011011011010100101010110100110110101101001010110110100101010101100110110101011001010110101100101010110110010110010101011010011010101101100110101010100101101011011001011010101001101101010101001001001011010101001101010010010010101101010011010100100100101101101010010101001001001010101101001101010010010010110101101001010010110110100000");
    doTest("`abcdefghijklmnopqrstuvwxyz{|}~",
           "000001001011011010101001001001011001101010101001010010010110101001011010010100100101011010010110100101001001011011010010101001010010010101011001011010010100100101101011001010100101001001010110110010101001010010010101010011011010010100100101101010011010100101001001010110100110101001010010010101011001101010010100100101101010100110100101001001010110101001101001010010010110110101001010010100100101010110100110100101001001011010110100101001010010010101101101001010010100100101010101100110100101001001011010101100101001010010010101101011001010010100100101010110110010100101001001011001010101101001010010010100110101011010010100100101100110101010100101001001010010110101101001010010010110010110101010010100100101001101101010101001001001010110110100101010010010010101010110011010100100100101101010110010101001001001010110101100101010010010010101011011001010010110110100000");
  }

  @Test
  public void testRejectsTrailingShiftCharacter() throws ChecksumException, NotFoundException {
    // '+', '$', '%' and '/' each start a two-character extended-mode escape. A symbol that
    // ends on one of them must fail with FormatException instead of reading past the text.
    for (char c : new char[] {'+', '$', '%', '/'}) {
      String contents = "A" + c;
      BitMatrix matrix = new Code39Writer().encode(contents, BarcodeFormat.CODE_39, 0, 0);
      BitArray row = new BitArray(matrix.getWidth());
      matrix.getRow(0, row);
      Code39Reader sut = new Code39Reader(false, true);
      try {
        sut.decodeRow(0, row, null);
        fail("Expected FormatException for trailing '" + c + '\'');
      } catch (FormatException expected) {
        // expected
      }
    }
  }

  @Test
  public void testRejectsEmptySymbolWithCheckDigit() throws FormatException, ChecksumException {
    // The asterisk (0x094) start/stop pattern as wide/narrow modules. A symbol that is just the
    // start and stop asterisks decodes to an empty payload, so there is no character to validate
    // as a check digit. It must fail with a ReaderException, not read result.charAt(-1).
    String asterisk = "100101101101";
    BitMatrix matrix = BitMatrix.parse("0000" + asterisk + '0' + asterisk + "0000", "1", "0");
    BitArray row = new BitArray(matrix.getWidth());
    matrix.getRow(0, row);
    Code39Reader sut = new Code39Reader(true, false);
    try {
      sut.decodeRow(0, row, null);
      fail("Expected NotFoundException for empty check-digit symbol");
    } catch (NotFoundException expected) {
      // expected
    }
  }

  private static void doTest(String expectedResult, String encodedResult)
      throws FormatException, ChecksumException, NotFoundException {
    Code39Reader sut = new Code39Reader(false, true);
    BitMatrix matrix = BitMatrix.parse(encodedResult, "1", "0");
    BitArray row = new BitArray(matrix.getWidth());
    matrix.getRow(0, row);
    Result result = sut.decodeRow(0, row, null);
    assertEquals(expectedResult, result.getText());
  }

}