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 startRange[], int startRangeLen,
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 = startRange[1];
53 int lgPatternFound = 0;
55 for (int x = 0; x < 6 && rowOffset < end; x++) {
56 int bestMatch = decodeDigit(row, counters, countersLen, rowOffset,
57 UPC_EAN_PATTERNS_L_AND_G_PATTERNS);
58 resultString.append(1, (char) ('0' + bestMatch % 10));
59 for (int i = 0; i < countersLen; i++) {
60 rowOffset += counters[i];
62 if (bestMatch >= 10) {
63 lgPatternFound |= 1 << (5 - x);
67 determineNumSysAndCheckDigit(resultString, lgPatternFound);
72 int* UPCEReader::decodeEnd(Ref<BitArray> row, int endStart) {
73 return findGuardPattern(row, endStart, true, MIDDLE_END_PATTERN,
74 sizeof(MIDDLE_END_PATTERN) / sizeof(int));
77 bool UPCEReader::checkChecksum(std::string s){
78 return UPCEANReader::checkChecksum(convertUPCEtoUPCA(s));
82 void UPCEReader::determineNumSysAndCheckDigit(std::string& resultString, int lgPatternFound) {
83 for (int numSys = 0; numSys <= 1; numSys++) {
84 for (int d = 0; d < 10; d++) {
85 if (lgPatternFound == NUMSYS_AND_CHECK_DIGIT_PATTERNS[numSys][d]) {
86 resultString.insert(0, 1, (char) ('0' + numSys));
87 resultString.append(1, (char) ('0' + d));
92 throw ReaderException("determineNumSysAndCheckDigit exception");
96 * Expands a UPC-E value back into its full, equivalent UPC-A code value.
98 * @param upce UPC-E code as string of digits
99 * @return equivalent UPC-A code as string of digits
101 std::string UPCEReader::convertUPCEtoUPCA(std::string upce) {
103 result.append(1, upce[0]);
104 char lastChar = upce[6];
109 result.append(upce.substr(1,2));
110 result.append(1, lastChar);
111 result.append("0000");
112 result.append(upce.substr(3,3));
115 result.append(upce.substr(1,3));
116 result.append("00000");
117 result.append(upce.substr(4,2));
120 result.append(upce.substr(1,4));
121 result.append("00000");
122 result.append(1, upce[5]);
125 result.append(upce.substr(1,5));
126 result.append("0000");
127 result.append(1, lastChar);
130 result.append(1, upce[7]);
135 BarcodeFormat UPCEReader::getBarcodeFormat() {
136 return BarcodeFormat_UPC_E;