5 * Created by Lukasz Warchol on 10-01-26.
6 * Copyright 2010 ZXing authors All rights reserved.
8 * Licensed under the Apache License, Version 2.0 (the "License");
9 * you may not use this file except in compliance with the License.
10 * You may obtain a copy of the License at
12 * http://www.apache.org/licenses/LICENSE-2.0
14 * Unless required by applicable law or agreed to in writing, software
15 * distributed under the License is distributed on an "AS IS" BASIS,
16 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17 * See the License for the specific language governing permissions and
18 * limitations under the License.
21 #include "UPCEReader.h"
22 #include <zxing/ReaderException.h>
28 * The pattern that marks the middle, and end, of a UPC-E pattern.
29 * There is no "second half" to a UPC-E barcode.
31 static const int MIDDLE_END_PATTERN[6] = {1, 1, 1, 1, 1, 1};
34 * See {@link #L_AND_G_PATTERNS}; these values similarly represent patterns of
35 * even-odd parity encodings of digits that imply both the number system (0 or 1)
36 * used, and the check digit.
38 static const int NUMSYS_AND_CHECK_DIGIT_PATTERNS[2][10] = {
39 {0x38, 0x34, 0x32, 0x31, 0x2C, 0x26, 0x23, 0x2A, 0x29, 0x25},
40 {0x07, 0x0B, 0x0D, 0x0E, 0x13, 0x19, 0x1C, 0x15, 0x16, 0x1A}
43 UPCEReader::UPCEReader(){
44 decodeMiddleCounters = new int[4];
45 for (int i=0; i<4; i++) {
46 decodeMiddleCounters[i] = 0;
50 int UPCEReader::decodeMiddle(Ref<BitArray> row, int startRange[], int startRangeLen, std::string& resultString){
52 int* counters = decodeMiddleCounters;
59 int end = row->getSize();
60 int rowOffset = startRange[1];
62 int lgPatternFound = 0;
64 for (int x = 0; x < 6 && rowOffset < end; x++) {
65 int bestMatch = decodeDigit(row, counters, countersLen, rowOffset, UPC_EAN_PATTERNS_L_AND_G_PATTERNS);
66 resultString.append(1, (char) ('0' + bestMatch % 10));
67 for (int i = 0; i < countersLen; i++) {
68 rowOffset += counters[i];
70 if (bestMatch >= 10) {
71 lgPatternFound |= 1 << (5 - x);
75 determineNumSysAndCheckDigit(resultString, lgPatternFound);
80 int* UPCEReader::decodeEnd(Ref<BitArray> row, int endStart){
81 return findGuardPattern(row, endStart, true, MIDDLE_END_PATTERN, sizeof(MIDDLE_END_PATTERN)/sizeof(int));
84 bool UPCEReader::checkChecksum(std::string s){
85 return UPCEANReader::checkChecksum(convertUPCEtoUPCA(s));
89 void UPCEReader::determineNumSysAndCheckDigit(std::string& resultString, int lgPatternFound){
90 for (int numSys = 0; numSys <= 1; numSys++) {
91 for (int d = 0; d < 10; d++) {
92 if (lgPatternFound == NUMSYS_AND_CHECK_DIGIT_PATTERNS[numSys][d]) {
93 resultString.insert((size_t)0, (size_t)1, (char) ('0' + numSys));
94 resultString.append(1, (char) ('0' + d));
99 throw ReaderException("determineNumSysAndCheckDigit exception");
103 * Expands a UPC-E value back into its full, equivalent UPC-A code value.
105 * @param upce UPC-E code as string of digits
106 * @return equivalent UPC-A code as string of digits
108 std::string& UPCEReader::convertUPCEtoUPCA(std::string upce) {
110 result.append(1, upce[0]);
111 char lastChar = upce[6];
116 result.append(upce.substr(1,2));
117 result.append(1, lastChar);
118 result.append("0000");
119 result.append(upce.substr(3,3));
122 result.append(upce.substr(1,3));
123 result.append("00000");
124 result.append(upce.substr(4,2));
127 result.append(upce.substr(1,4));
128 result.append("00000");
129 result.append(1, upce[5]);
132 result.append(upce.substr(1,5));
133 result.append("0000");
134 result.append(1, lastChar);
137 result.append(1, upce[7]);
138 std::string& returnResult = result;
143 BarcodeFormat UPCEReader::getBarcodeFormat(){
144 return BarcodeFormat_UPC_E;
146 UPCEReader::~UPCEReader(){
147 delete [] decodeMiddleCounters;