@zxing/library
Version:
TypeScript port of ZXing multi-format 1D/2D barcode image processing library.
108 lines (107 loc) • 4.52 kB
JavaScript
/*
* Copyright (C) 2012 ZXing authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
var __values = (this && this.__values) || function(o) {
var s = typeof Symbol === "function" && Symbol.iterator, m = s && o[s], i = 0;
if (m) return m.call(o);
if (o && typeof o.length === "number") return {
next: function () {
if (o && i >= o.length) o = void 0;
return { value: o && o[i++], done: !o };
}
};
throw new TypeError(s ? "Object is not iterable." : "Symbol.iterator is not defined.");
};
import BarcodeFormat from '../BarcodeFormat';
import AbstractUPCEANReader from './AbstractUPCEANReader';
import Result from '../Result';
import ResultPoint from '../ResultPoint';
import ResultMetadataType from '../ResultMetadataType';
import NotFoundException from '../NotFoundException';
/**
* @see UPCEANExtension5Support
*/
var UPCEANExtension2Support = /** @class */ (function () {
function UPCEANExtension2Support() {
this.decodeMiddleCounters = Int32Array.from([0, 0, 0, 0]);
this.decodeRowStringBuffer = '';
}
UPCEANExtension2Support.prototype.decodeRow = function (rowNumber, row, extensionStartRange) {
var result = this.decodeRowStringBuffer;
var end = this.decodeMiddle(row, extensionStartRange, result);
var resultString = result.toString();
var extensionData = UPCEANExtension2Support.parseExtensionString(resultString);
var resultPoints = [
new ResultPoint((extensionStartRange[0] + extensionStartRange[1]) / 2.0, rowNumber),
new ResultPoint(end, rowNumber)
];
var extensionResult = new Result(resultString, null, 0, resultPoints, BarcodeFormat.UPC_EAN_EXTENSION, new Date().getTime());
if (extensionData != null) {
extensionResult.putAllMetadata(extensionData);
}
return extensionResult;
};
UPCEANExtension2Support.prototype.decodeMiddle = function (row, startRange, resultString) {
var e_1, _a;
var counters = this.decodeMiddleCounters;
counters[0] = 0;
counters[1] = 0;
counters[2] = 0;
counters[3] = 0;
var end = row.getSize();
var rowOffset = startRange[1];
var checkParity = 0;
for (var x = 0; x < 2 && rowOffset < end; x++) {
var bestMatch = AbstractUPCEANReader.decodeDigit(row, counters, rowOffset, AbstractUPCEANReader.L_AND_G_PATTERNS);
resultString += String.fromCharCode(('0'.charCodeAt(0) + bestMatch % 10));
try {
for (var counters_1 = (e_1 = void 0, __values(counters)), counters_1_1 = counters_1.next(); !counters_1_1.done; counters_1_1 = counters_1.next()) {
var counter = counters_1_1.value;
rowOffset += counter;
}
}
catch (e_1_1) { e_1 = { error: e_1_1 }; }
finally {
try {
if (counters_1_1 && !counters_1_1.done && (_a = counters_1.return)) _a.call(counters_1);
}
finally { if (e_1) throw e_1.error; }
}
if (bestMatch >= 10) {
checkParity |= 1 << (1 - x);
}
if (x !== 1) {
// Read off separator if not last
rowOffset = row.getNextSet(rowOffset);
rowOffset = row.getNextUnset(rowOffset);
}
}
if (resultString.length !== 2) {
throw new NotFoundException();
}
if (parseInt(resultString.toString()) % 4 !== checkParity) {
throw new NotFoundException();
}
return rowOffset;
};
UPCEANExtension2Support.parseExtensionString = function (raw) {
if (raw.length !== 2) {
return null;
}
return new Map([[ResultMetadataType.ISSUE_NUMBER, parseInt(raw)]]);
};
return UPCEANExtension2Support;
}());
export default UPCEANExtension2Support;