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 "UPCEReader.h"
21 #include <zxing/ReaderException.h>
27 * The pattern that marks the middle, and end, of a UPC-E pattern.
28 * There is no "second half" to a UPC-E barcode.
30 static const int MIDDLE_END_PATTERN[6] = {1, 1, 1, 1, 1, 1};
33 * See {@link #L_AND_G_PATTERNS}; these values similarly represent patterns of
34 * even-odd parity encodings of digits that imply both the number system (0 or 1)
35 * used, and the check digit.
37 static const int NUMSYS_AND_CHECK_DIGIT_PATTERNS[2][10] = {
38 {0x38, 0x34, 0x32, 0x31, 0x2C, 0x26, 0x23, 0x2A, 0x29, 0x25},
39 {0x07, 0x0B, 0x0D, 0x0E, 0x13, 0x19, 0x1C, 0x15, 0x16, 0x1A}
42 UPCEReader::UPCEReader() {
45 int UPCEReader::decodeMiddle(Ref<BitArray> row, int startGuardBegin, int startGuardEnd,
46 std::string& resultString) {
47 const int countersLen = 4;
48 int counters[countersLen] = { 0, 0, 0, 0 };
50 int end = row->getSize();
51 int rowOffset = startGuardEnd;
52 int lgPatternFound = 0;
54 for (int x = 0; x < 6 && rowOffset < end; x++) {
55 int bestMatch = decodeDigit(row, counters, countersLen, rowOffset,
56 UPC_EAN_PATTERNS_L_AND_G_PATTERNS);
60 resultString.append(1, (char) ('0' + bestMatch % 10));
61 for (int i = 0; i < countersLen; i++) {
62 rowOffset += counters[i];
64 if (bestMatch >= 10) {
65 lgPatternFound |= 1 << (5 - x);
69 if (!determineNumSysAndCheckDigit(resultString, lgPatternFound)) {
75 bool UPCEReader::decodeEnd(Ref<BitArray> row, int endStart, int* endGuardBegin,
77 return findGuardPattern(row, endStart, true, MIDDLE_END_PATTERN,
78 sizeof(MIDDLE_END_PATTERN) / sizeof(int), endGuardBegin, endGuardEnd);
81 bool UPCEReader::checkChecksum(std::string s){
82 return UPCEANReader::checkChecksum(convertUPCEtoUPCA(s));
86 bool UPCEReader::determineNumSysAndCheckDigit(std::string& resultString, int lgPatternFound) {
87 for (int numSys = 0; numSys <= 1; numSys++) {
88 for (int d = 0; d < 10; d++) {
89 if (lgPatternFound == NUMSYS_AND_CHECK_DIGIT_PATTERNS[numSys][d]) {
90 resultString.insert(0, 1, (char) ('0' + numSys));
91 resultString.append(1, (char) ('0' + d));
100 * Expands a UPC-E value back into its full, equivalent UPC-A code value.
102 * @param upce UPC-E code as string of digits
103 * @return equivalent UPC-A code as string of digits
105 std::string UPCEReader::convertUPCEtoUPCA(std::string upce) {
107 result.append(1, upce[0]);
108 char lastChar = upce[6];
113 result.append(upce.substr(1,2));
114 result.append(1, lastChar);
115 result.append("0000");
116 result.append(upce.substr(3,3));
119 result.append(upce.substr(1,3));
120 result.append("00000");
121 result.append(upce.substr(4,2));
124 result.append(upce.substr(1,4));
125 result.append("00000");
126 result.append(1, upce[5]);
129 result.append(upce.substr(1,5));
130 result.append("0000");
131 result.append(1, lastChar);
134 result.append(1, upce[7]);
139 BarcodeFormat UPCEReader::getBarcodeFormat() {
140 return BarcodeFormat_UPC_E;