2 * Copyright 2010 ZXing authors
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 package com.google.zxing.oned;
19 import java.util.Hashtable;
20 import com.google.zxing.BarcodeFormat;
21 import com.google.zxing.WriterException;
22 import com.google.zxing.common.BitMatrix;
25 * This object renders a CODE39 code as a {@link BitMatrix}.
27 * @author erik.barbara@gmail.com (Erik Barbara)
29 public final class Code39Writer extends UPCEANWriter {
31 public BitMatrix encode(String contents,
35 Hashtable hints) throws WriterException {
36 if (format != BarcodeFormat.CODE_39) {
37 throw new IllegalArgumentException("Can only encode CODE_39, but got " + format);
39 return super.encode(contents, format, width, height, hints);
42 public byte[] encode(String contents) {
43 int length = contents.length();
45 throw new IllegalArgumentException(
46 "Requested contents should be less than 80 digits long, but got " + length);
49 int[] widths = new int[9];
50 int codeWidth = 24 + 1 + length;
51 for (int i = 0; i < length; i++) {
52 int indexInString = Code39Reader.ALPHABET_STRING.indexOf(contents.charAt(i));
53 toIntArray(Code39Reader.CHARACTER_ENCODINGS[indexInString], widths);
54 for(int j = 0; j < widths.length; j++) {
55 codeWidth += widths[j];
58 byte[] result = new byte[codeWidth];
59 toIntArray(Code39Reader.CHARACTER_ENCODINGS[39], widths);
60 int pos = appendPattern(result, 0, widths, 1);
61 int[] narrowWhite = {1};
62 pos += appendPattern(result, pos, narrowWhite, 0);
63 //append next character to bytematrix
64 for(int i = length-1; i >= 0; i--) {
65 int indexInString = Code39Reader.ALPHABET_STRING.indexOf(contents.charAt(i));
66 toIntArray(Code39Reader.CHARACTER_ENCODINGS[indexInString], widths);
67 pos += appendPattern(result, pos, widths, 1);
68 pos += appendPattern(result, pos, narrowWhite, 0);
70 toIntArray(Code39Reader.CHARACTER_ENCODINGS[39], widths);
71 pos += appendPattern(result, pos, widths, 1);
75 private static void toIntArray(int a, int[] toReturn) {
76 for (int i = 0; i < 9; i++) {
77 int temp = a & (1 << i);
78 toReturn[i] = (temp == 0) ? 1 : 2;