2 * Copyright 2008 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 com.google.zxing.ReaderException;
20 import com.google.zxing.BarcodeFormat;
21 import com.google.zxing.common.BitArray;
24 * <p>Implements decoding of the EAN-8 format.</p>
28 public final class EAN8Reader extends AbstractUPCEANReader {
30 private final int[] decodeMiddleCounters;
33 decodeMiddleCounters = new int[4];
36 protected int decodeMiddle(BitArray row, int[] startRange, StringBuffer result) throws ReaderException {
37 int[] counters = decodeMiddleCounters;
42 int end = row.getSize();
43 int rowOffset = startRange[1];
45 for (int x = 0; x < 4 && rowOffset < end; x++) {
46 int bestMatch = decodeDigit(row, counters, rowOffset, L_PATTERNS);
47 result.append((char) ('0' + bestMatch));
48 for (int i = 0; i < counters.length; i++) {
49 rowOffset += counters[i];
53 int[] middleRange = findGuardPattern(row, rowOffset, true, MIDDLE_PATTERN);
54 rowOffset = middleRange[1];
56 for (int x = 0; x < 4 && rowOffset < end; x++) {
57 int bestMatch = decodeDigit(row, counters, rowOffset, L_PATTERNS);
58 result.append((char) ('0' + bestMatch));
59 for (int i = 0; i < counters.length; i++) {
60 rowOffset += counters[i];
67 BarcodeFormat getBarcodeFormat() {
68 return BarcodeFormat.EAN_8;