5 * Copyright 2010 ZXing authors All rights reserved.
7 * Licensed under the Apache License, Version 2.0 (the "License");
8 * you may not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
11 * http://www.apache.org/licenses/LICENSE-2.0
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
20 #include "EAN13Reader.h"
21 #include <zxing/ReaderException.h>
26 static const int FIRST_DIGIT_ENCODINGS[10] = {
27 0x00, 0x0B, 0x0D, 0xE, 0x13, 0x19, 0x1C, 0x15, 0x16, 0x1A
30 EAN13Reader::EAN13Reader() { }
32 int EAN13Reader::decodeMiddle(Ref<BitArray> row, int startRange[], int startRangeLen,
33 std::string& resultString) {
34 const int countersLen = 4;
35 int counters[countersLen] = { 0, 0, 0, 0 };
37 int end = row->getSize();
38 int rowOffset = startRange[1];
39 int lgPatternFound = 0;
41 for (int x = 0; x < 6 && rowOffset < end; x++) {
42 int bestMatch = decodeDigit(row, counters, countersLen, rowOffset,
43 UPC_EAN_PATTERNS_L_AND_G_PATTERNS);
47 resultString.append(1, (char) ('0' + bestMatch % 10));
48 for (int i = 0; i < countersLen; i++) {
49 rowOffset += counters[i];
51 if (bestMatch >= 10) {
52 lgPatternFound |= 1 << (5 - x);
56 if (!determineFirstDigit(resultString, lgPatternFound)) {
60 int* middleRange = findGuardPattern(row, rowOffset, true, (int*)getMIDDLE_PATTERN(),
61 getMIDDLE_PATTERN_LEN());
62 if (middleRange != NULL) {
63 rowOffset = middleRange[1];
64 for (int x = 0; x < 6 && rowOffset < end; x++) {
65 int bestMatch = decodeDigit(row, counters, countersLen, rowOffset,
66 UPC_EAN_PATTERNS_L_PATTERNS);
68 delete [] middleRange;
71 resultString.append(1, (char) ('0' + bestMatch));
72 for (int i = 0; i < countersLen; i++) {
73 rowOffset += counters[i];
77 delete [] middleRange;
83 bool EAN13Reader::determineFirstDigit(std::string& resultString, int lgPatternFound) {
84 for (int d = 0; d < 10; d++) {
85 if (lgPatternFound == FIRST_DIGIT_ENCODINGS[d]) {
86 resultString.insert(0, 1, (char) ('0' + d));
93 BarcodeFormat EAN13Reader::getBarcodeFormat(){
94 return BarcodeFormat_EAN_13;