@zxing/library
Version:
TypeScript port of ZXing multi-format 1D/2D barcode image processing library.
107 lines (106 loc) • 4.57 kB
JavaScript
/*
* Copyright 2008 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 __extends = (this && this.__extends) || (function () {
var extendStatics = function (d, b) {
extendStatics = Object.setPrototypeOf ||
({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
return extendStatics(d, b);
};
return function (d, b) {
extendStatics(d, b);
function __() { this.constructor = d; }
d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
};
})();
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 UPCEANReader from './UPCEANReader';
/**
* <p>Implements decoding of the EAN-8 format.</p>
*
* @author Sean Owen
*/
var EAN8Reader = /** @class */ (function (_super) {
__extends(EAN8Reader, _super);
function EAN8Reader() {
var _this = _super.call(this) || this;
_this.decodeMiddleCounters = Int32Array.from([0, 0, 0, 0]);
return _this;
}
EAN8Reader.prototype.decodeMiddle = function (row, startRange, resultString) {
var e_1, _a, e_2, _b;
var counters = this.decodeMiddleCounters;
counters[0] = 0;
counters[1] = 0;
counters[2] = 0;
counters[3] = 0;
var end = row.getSize();
var rowOffset = startRange[1];
for (var x = 0; x < 4 && rowOffset < end; x++) {
var bestMatch = UPCEANReader.decodeDigit(row, counters, rowOffset, UPCEANReader.L_PATTERNS);
resultString += String.fromCharCode(('0'.charCodeAt(0) + bestMatch));
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; }
}
}
var middleRange = UPCEANReader.findGuardPattern(row, rowOffset, true, UPCEANReader.MIDDLE_PATTERN, new Int32Array(UPCEANReader.MIDDLE_PATTERN.length).fill(0));
rowOffset = middleRange[1];
for (var x = 0; x < 4 && rowOffset < end; x++) {
var bestMatch = UPCEANReader.decodeDigit(row, counters, rowOffset, UPCEANReader.L_PATTERNS);
resultString += String.fromCharCode(('0'.charCodeAt(0) + bestMatch));
try {
for (var counters_2 = (e_2 = void 0, __values(counters)), counters_2_1 = counters_2.next(); !counters_2_1.done; counters_2_1 = counters_2.next()) {
var counter = counters_2_1.value;
rowOffset += counter;
}
}
catch (e_2_1) { e_2 = { error: e_2_1 }; }
finally {
try {
if (counters_2_1 && !counters_2_1.done && (_b = counters_2.return)) _b.call(counters_2);
}
finally { if (e_2) throw e_2.error; }
}
}
return { rowOffset: rowOffset, resultString: resultString };
};
EAN8Reader.prototype.getBarcodeFormat = function () {
return BarcodeFormat.EAN_8;
};
return EAN8Reader;
}(UPCEANReader));
export default EAN8Reader;