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Core barcode encoding/decoding library
There is a newer version: 3.5.3
/*
 * Copyright 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.
 */

package com.google.zxing.oned;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.common.BitMatrix;

import java.util.Collection;
import java.util.Collections;

/**
 * This object renders a CODE39 code as a {@link BitMatrix}.
 *
 * @author [email protected] (Erik Barbara)
 */
public final class Code39Writer extends OneDimensionalCodeWriter {

  @Override
  protected Collection getSupportedWriteFormats() {
    return Collections.singleton(BarcodeFormat.CODE_39);
  }

  @Override
  public boolean[] encode(String contents) {
    int length = contents.length();
    if (length > 80) {
      throw new IllegalArgumentException(
          "Requested contents should be less than 80 digits long, but got " + length);
    }

    for (int i = 0; i < length; i++) {
      int indexInString = Code39Reader.ALPHABET_STRING.indexOf(contents.charAt(i));
      if (indexInString < 0) {
        contents = tryToConvertToExtendedMode(contents);
        length = contents.length();
        if (length > 80) {
          throw new IllegalArgumentException("Requested contents should be less than 80 digits long, but got " +
              length + " (extended full ASCII mode)");
        }
        break;
      }
    }

    int[] widths = new int[9];
    int codeWidth = 24 + 1 + (13 * length);
    boolean[] result = new boolean[codeWidth];
    toIntArray(Code39Reader.ASTERISK_ENCODING, widths);
    int pos = appendPattern(result, 0, widths, true);
    int[] narrowWhite = {1};
    pos += appendPattern(result, pos, narrowWhite, false);
    //append next character to byte matrix
    for (int i = 0; i < length; i++) {
      int indexInString = Code39Reader.ALPHABET_STRING.indexOf(contents.charAt(i));
      toIntArray(Code39Reader.CHARACTER_ENCODINGS[indexInString], widths);
      pos += appendPattern(result, pos, widths, true);
      pos += appendPattern(result, pos, narrowWhite, false);
    }
    toIntArray(Code39Reader.ASTERISK_ENCODING, widths);
    appendPattern(result, pos, widths, true);
    return result;
  }

  private static void toIntArray(int a, int[] toReturn) {
    for (int i = 0; i < 9; i++) {
      int temp = a & (1 << (8 - i));
      toReturn[i] = temp == 0 ? 1 : 2;
    }
  }

  private static String tryToConvertToExtendedMode(String contents) {
    int length = contents.length();
    StringBuilder extendedContent = new StringBuilder();
    for (int i = 0; i < length; i++) {
      char character = contents.charAt(i);
      switch (character) {
        case '\u0000':
          extendedContent.append("%U");
          break;
        case ' ':
        case '-':
        case '.':
          extendedContent.append(character);
          break;
        case '@':
          extendedContent.append("%V");
          break;
        case '`':
          extendedContent.append("%W");
          break;
        default:
          if (character <= 26) {
            extendedContent.append('$');
            extendedContent.append((char) ('A' + (character - 1)));
          } else if (character < ' ') {
            extendedContent.append('%');
            extendedContent.append((char) ('A' + (character - 27)));
          } else if (character <= ',' || character == '/' || character == ':') {
            extendedContent.append('/');
            extendedContent.append((char) ('A' + (character - 33)));
          } else if (character <= '9') {
            extendedContent.append((char) ('0' + (character - 48)));
          } else if (character <= '?') {
            extendedContent.append('%');
            extendedContent.append((char) ('F' + (character - 59)));
          } else if (character <= 'Z') {
            extendedContent.append((char) ('A' + (character - 65)));
          } else if (character <= '_') {
            extendedContent.append('%');
            extendedContent.append((char) ('K' + (character - 91)));
          } else if (character <= 'z') {
            extendedContent.append('+');
            extendedContent.append((char) ('A' + (character - 97)));
          } else if (character <= 127) {
            extendedContent.append('%');
            extendedContent.append((char) ('P' + (character - 123)));
          } else {
            throw new IllegalArgumentException(
                "Requested content contains a non-encodable character: '" + contents.charAt(i) + "'");
          }
          break;
      }
    }

    return extendedContent.toString();
  }

}