mirror of https://github.com/status-im/qzxing.git
148 lines
4.6 KiB
C++
148 lines
4.6 KiB
C++
// -*- mode:c++; tab-width:2; indent-tabs-mode:nil; c-basic-offset:2 -*-
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/*
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* Copyright 2010 ZXing authors All rights reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "UPCEReader.h"
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#include <zxing/ReaderException.h>
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#include <qglobal.h>
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namespace zxing {
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namespace oned {
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/**
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* The pattern that marks the middle, and end, of a UPC-E pattern.
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* There is no "second half" to a UPC-E barcode.
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*/
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static const int MIDDLE_END_PATTERN[6] = {1, 1, 1, 1, 1, 1};
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/**
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* See {@link #L_AND_G_PATTERNS}; these values similarly represent patterns of
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* even-odd parity encodings of digits that imply both the number system (0 or 1)
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* used, and the check digit.
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*/
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static const int NUMSYS_AND_CHECK_DIGIT_PATTERNS[2][10] = {
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{0x38, 0x34, 0x32, 0x31, 0x2C, 0x26, 0x23, 0x2A, 0x29, 0x25},
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{0x07, 0x0B, 0x0D, 0x0E, 0x13, 0x19, 0x1C, 0x15, 0x16, 0x1A}
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};
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UPCEReader::UPCEReader() {
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}
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int UPCEReader::decodeMiddle(Ref<BitArray> row, int startGuardBegin, int startGuardEnd,
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std::string& resultString) {
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(void)startGuardBegin;
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const int countersLen = 4;
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int counters[countersLen] = { 0, 0, 0, 0 };
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int end = row->getSize();
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int rowOffset = startGuardEnd;
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int lgPatternFound = 0;
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for (int x = 0; x < 6 && rowOffset < end; x++) {
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int bestMatch = decodeDigit(row, counters, countersLen, rowOffset,
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UPC_EAN_PATTERNS_L_AND_G_PATTERNS);
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if (bestMatch < 0) {
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return -1;
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}
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resultString.append(1, (char) ('0' + bestMatch % 10));
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for (int i = 0; i < countersLen; i++) {
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rowOffset += counters[i];
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}
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if (bestMatch >= 10) {
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lgPatternFound |= 1 << (5 - x);
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}
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}
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if (!determineNumSysAndCheckDigit(resultString, lgPatternFound)) {
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return -1;
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}
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return rowOffset;
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}
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bool UPCEReader::decodeEnd(Ref<BitArray> row, int endStart, int* endGuardBegin,
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int* endGuardEnd) {
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return findGuardPattern(row, endStart, true, MIDDLE_END_PATTERN,
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sizeof(MIDDLE_END_PATTERN) / sizeof(int), endGuardBegin, endGuardEnd);
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}
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bool UPCEReader::checkChecksum(std::string s){
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return UPCEANReader::checkChecksum(convertUPCEtoUPCA(s));
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}
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bool UPCEReader::determineNumSysAndCheckDigit(std::string& resultString, int lgPatternFound) {
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for (int numSys = 0; numSys <= 1; numSys++) {
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for (int d = 0; d < 10; d++) {
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if (lgPatternFound == NUMSYS_AND_CHECK_DIGIT_PATTERNS[numSys][d]) {
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#if defined(Q_OS_SYMBIAN)
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resultString.insert((char*)0, 1, (char) ((int)'0' + numSys));
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#else
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resultString.insert(/*(char*)*/0, 1, (char) ((int)'0' + numSys));
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#endif
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resultString.append(1, (char) ('0' + d));
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return true;
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}
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}
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}
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return false;
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}
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/**
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* Expands a UPC-E value back into its full, equivalent UPC-A code value.
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*
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* @param upce UPC-E code as string of digits
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* @return equivalent UPC-A code as string of digits
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*/
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std::string UPCEReader::convertUPCEtoUPCA(std::string upce) {
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std::string result;
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result.append(1, upce[0]);
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char lastChar = upce[6];
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switch (lastChar) {
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case '0':
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case '1':
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case '2':
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result.append(upce.substr(1,2));
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result.append(1, lastChar);
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result.append("0000");
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result.append(upce.substr(3,3));
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break;
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case '3':
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result.append(upce.substr(1,3));
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result.append("00000");
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result.append(upce.substr(4,2));
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break;
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case '4':
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result.append(upce.substr(1,4));
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result.append("00000");
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result.append(1, upce[5]);
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break;
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default:
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result.append(upce.substr(1,5));
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result.append("0000");
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result.append(1, lastChar);
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break;
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}
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result.append(1, upce[7]);
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return result;
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}
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BarcodeFormat UPCEReader::getBarcodeFormat() {
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return BarcodeFormat_UPC_E;
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}
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}
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}
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