@zxing/library
Version:
TypeScript port of ZXing multi-format 1D/2D barcode image processing library.
220 lines (219 loc) • 8.75 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 UPCEANReader from './UPCEANReader';
import StringBuilder from '../util/StringBuilder';
import NotFoundException from '../NotFoundException';
import BarcodeFormat from '../BarcodeFormat';
// package com.google.zxing.oned;
// import com.google.zxing.BarcodeFormat;
// import com.google.zxing.FormatException;
// import com.google.zxing.NotFoundException;
// import com.google.zxing.common.BitArray;
/**
* <p>Implements decoding of the UPC-E format.</p>
* <p><a href="http://www.barcodeisland.com/upce.phtml">This</a> is a great reference for
* UPC-E information.</p>
*
* @author Sean Owen
*
* @source https://github.com/zxing/zxing/blob/3c96923276dd5785d58eb970b6ba3f80d36a9505/core/src/main/java/com/google/zxing/oned/UPCEReader.java
*
* @experimental
*/
var UPCEReader = /** @class */ (function (_super) {
__extends(UPCEReader, _super);
function UPCEReader() {
var _this = _super.call(this) || this;
_this.decodeMiddleCounters = new Int32Array(4);
return _this;
}
/**
* @throws NotFoundException
*/
// @Override
UPCEReader.prototype.decodeMiddle = function (row, startRange, result) {
var e_1, _a;
var counters = this.decodeMiddleCounters.map(function (x) { return x; });
counters[0] = 0;
counters[1] = 0;
counters[2] = 0;
counters[3] = 0;
var end = row.getSize();
var rowOffset = startRange[1];
var lgPatternFound = 0;
for (var x = 0; x < 6 && rowOffset < end; x++) {
var bestMatch = UPCEReader.decodeDigit(row, counters, rowOffset, UPCEReader.L_AND_G_PATTERNS);
result += 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) {
lgPatternFound |= 1 << (5 - x);
}
}
UPCEReader.determineNumSysAndCheckDigit(new StringBuilder(result), lgPatternFound);
return rowOffset;
};
/**
* @throws NotFoundException
*/
// @Override
UPCEReader.prototype.decodeEnd = function (row, endStart) {
return UPCEReader.findGuardPatternWithoutCounters(row, endStart, true, UPCEReader.MIDDLE_END_PATTERN);
};
/**
* @throws FormatException
*/
// @Override
UPCEReader.prototype.checkChecksum = function (s) {
return UPCEANReader.checkChecksum(UPCEReader.convertUPCEtoUPCA(s));
};
/**
* @throws NotFoundException
*/
UPCEReader.determineNumSysAndCheckDigit = function (resultString, lgPatternFound) {
for (var numSys = 0; numSys <= 1; numSys++) {
for (var d = 0; d < 10; d++) {
if (lgPatternFound === this.NUMSYS_AND_CHECK_DIGIT_PATTERNS[numSys][d]) {
resultString.insert(0, /*(char)*/ ('0' + numSys));
resultString.append(/*(char)*/ ('0' + d));
return;
}
}
}
throw NotFoundException.getNotFoundInstance();
};
// @Override
UPCEReader.prototype.getBarcodeFormat = function () {
return BarcodeFormat.UPC_E;
};
/**
* Expands a UPC-E value back into its full, equivalent UPC-A code value.
*
* @param upce UPC-E code as string of digits
* @return equivalent UPC-A code as string of digits
*/
UPCEReader.convertUPCEtoUPCA = function (upce) {
// the following line is equivalent to upce.getChars(1, 7, upceChars, 0);
var upceChars = upce.slice(1, 7).split('').map(function (x) { return x.charCodeAt(0); });
var result = new StringBuilder( /*12*/);
result.append(upce.charAt(0));
var lastChar = upceChars[5];
switch (lastChar) {
case 0:
case 1:
case 2:
result.appendChars(upceChars, 0, 2);
result.append(lastChar);
result.append('0000');
result.appendChars(upceChars, 2, 3);
break;
case 3:
result.appendChars(upceChars, 0, 3);
result.append('00000');
result.appendChars(upceChars, 3, 2);
break;
case 4:
result.appendChars(upceChars, 0, 4);
result.append('00000');
result.append(upceChars[4]);
break;
default:
result.appendChars(upceChars, 0, 5);
result.append('0000');
result.append(lastChar);
break;
}
// Only append check digit in conversion if supplied
if (upce.length >= 8) {
result.append(upce.charAt(7));
}
return result.toString();
};
/**
* The pattern that marks the middle, and end, of a UPC-E pattern.
* There is no "second half" to a UPC-E barcode.
*/
UPCEReader.MIDDLE_END_PATTERN = Int32Array.from([1, 1, 1, 1, 1, 1]);
// For an UPC-E barcode, the final digit is represented by the parities used
// to encode the middle six digits, according to the table below.
//
// Parity of next 6 digits
// Digit 0 1 2 3 4 5
// 0 Even Even Even Odd Odd Odd
// 1 Even Even Odd Even Odd Odd
// 2 Even Even Odd Odd Even Odd
// 3 Even Even Odd Odd Odd Even
// 4 Even Odd Even Even Odd Odd
// 5 Even Odd Odd Even Even Odd
// 6 Even Odd Odd Odd Even Even
// 7 Even Odd Even Odd Even Odd
// 8 Even Odd Even Odd Odd Even
// 9 Even Odd Odd Even Odd Even
//
// The encoding is represented by the following array, which is a bit pattern
// using Odd = 0 and Even = 1. For example, 5 is represented by:
//
// Odd Even Even Odd Odd Even
// in binary:
// 0 1 1 0 0 1 == 0x19
//
/**
* See {@link #L_AND_G_PATTERNS}; these values similarly represent patterns of
* even-odd parity encodings of digits that imply both the number system (0 or 1)
* used, and the check digit.
*/
UPCEReader.NUMSYS_AND_CHECK_DIGIT_PATTERNS = [
Int32Array.from([0x38, 0x34, 0x32, 0x31, 0x2C, 0x26, 0x23, 0x2A, 0x29, 0x25]),
Int32Array.from([0x07, 0x0B, 0x0D, 0x0E, 0x13, 0x19, 0x1C, 0x15, 0x16, 0x1]),
];
return UPCEReader;
}(UPCEANReader));
export default UPCEReader;