"use strict";
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/*
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* Copyright 2008 ZXing authors
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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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var __extends = (this && this.__extends) || (function () {
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var extendStatics = function (d, b) {
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extendStatics = Object.setPrototypeOf ||
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({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
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function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
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return extendStatics(d, b);
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};
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return function (d, b) {
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extendStatics(d, b);
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function __() { this.constructor = d; }
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d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
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};
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})();
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var __values = (this && this.__values) || function(o) {
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var s = typeof Symbol === "function" && Symbol.iterator, m = s && o[s], i = 0;
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if (m) return m.call(o);
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if (o && typeof o.length === "number") return {
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next: function () {
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if (o && i >= o.length) o = void 0;
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return { value: o && o[i++], done: !o };
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}
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};
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throw new TypeError(s ? "Object is not iterable." : "Symbol.iterator is not defined.");
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};
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Object.defineProperty(exports, "__esModule", { value: true });
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/*namespace com.google.zxing.oned {*/
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var BarcodeFormat_1 = require("../BarcodeFormat");
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var DecodeHintType_1 = require("../DecodeHintType");
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var FormatException_1 = require("../FormatException");
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var NotFoundException_1 = require("../NotFoundException");
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var Result_1 = require("../Result");
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var ResultPoint_1 = require("../ResultPoint");
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var StringBuilder_1 = require("../util/StringBuilder");
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var System_1 = require("../util/System");
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var OneDReader_1 = require("./OneDReader");
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/**
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* <p>Decodes ITF barcodes.</p>
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*
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* @author Tjieco
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*/
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var ITFReader = /** @class */ (function (_super) {
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__extends(ITFReader, _super);
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function ITFReader() {
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// private static W = 3; // Pixel width of a 3x wide line
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// private static w = 2; // Pixel width of a 2x wide line
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// private static N = 1; // Pixed width of a narrow line
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var _this = _super !== null && _super.apply(this, arguments) || this;
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// Stores the actual narrow line width of the image being decoded.
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_this.narrowLineWidth = -1;
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return _this;
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}
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// See ITFWriter.PATTERNS
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/*
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/!**
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* Patterns of Wide / Narrow lines to indicate each digit
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*!/
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*/
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ITFReader.prototype.decodeRow = function (rowNumber, row, hints) {
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var e_1, _a;
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// Find out where the Middle section (payload) starts & ends
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var startRange = this.decodeStart(row);
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var endRange = this.decodeEnd(row);
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var result = new StringBuilder_1.default();
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ITFReader.decodeMiddle(row, startRange[1], endRange[0], result);
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var resultString = result.toString();
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var allowedLengths = null;
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if (hints != null) {
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allowedLengths = hints.get(DecodeHintType_1.default.ALLOWED_LENGTHS);
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}
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if (allowedLengths == null) {
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allowedLengths = ITFReader.DEFAULT_ALLOWED_LENGTHS;
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}
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// To avoid false positives with 2D barcodes (and other patterns), make
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// an assumption that the decoded string must be a 'standard' length if it's short
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var length = resultString.length;
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var lengthOK = false;
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var maxAllowedLength = 0;
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try {
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for (var allowedLengths_1 = __values(allowedLengths), allowedLengths_1_1 = allowedLengths_1.next(); !allowedLengths_1_1.done; allowedLengths_1_1 = allowedLengths_1.next()) {
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var value = allowedLengths_1_1.value;
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if (length === value) {
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lengthOK = true;
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break;
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}
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if (value > maxAllowedLength) {
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maxAllowedLength = value;
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}
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}
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}
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catch (e_1_1) { e_1 = { error: e_1_1 }; }
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finally {
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try {
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if (allowedLengths_1_1 && !allowedLengths_1_1.done && (_a = allowedLengths_1.return)) _a.call(allowedLengths_1);
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}
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finally { if (e_1) throw e_1.error; }
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}
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if (!lengthOK && length > maxAllowedLength) {
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lengthOK = true;
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}
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if (!lengthOK) {
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throw new FormatException_1.default();
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}
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var points = [new ResultPoint_1.default(startRange[1], rowNumber), new ResultPoint_1.default(endRange[0], rowNumber)];
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var resultReturn = new Result_1.default(resultString, null, // no natural byte representation for these barcodes
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0, points, BarcodeFormat_1.default.ITF, new Date().getTime());
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return resultReturn;
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};
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/*
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/!**
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* @param row row of black/white values to search
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* @param payloadStart offset of start pattern
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* @param resultString {@link StringBuilder} to append decoded chars to
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* @throws NotFoundException if decoding could not complete successfully
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*!/*/
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ITFReader.decodeMiddle = function (row, payloadStart, payloadEnd, resultString) {
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// Digits are interleaved in pairs - 5 black lines for one digit, and the
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// 5
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// interleaved white lines for the second digit.
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// Therefore, need to scan 10 lines and then
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// split these into two arrays
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var counterDigitPair = new Int32Array(10); // 10
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var counterBlack = new Int32Array(5); // 5
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var counterWhite = new Int32Array(5); // 5
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counterDigitPair.fill(0);
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counterBlack.fill(0);
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counterWhite.fill(0);
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while (payloadStart < payloadEnd) {
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// Get 10 runs of black/white.
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OneDReader_1.default.recordPattern(row, payloadStart, counterDigitPair);
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// Split them into each array
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for (var k = 0; k < 5; k++) {
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var twoK = 2 * k;
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counterBlack[k] = counterDigitPair[twoK];
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counterWhite[k] = counterDigitPair[twoK + 1];
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}
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var bestMatch = ITFReader.decodeDigit(counterBlack);
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resultString.append(bestMatch.toString());
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bestMatch = this.decodeDigit(counterWhite);
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resultString.append(bestMatch.toString());
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counterDigitPair.forEach(function (counterDigit) {
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payloadStart += counterDigit;
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});
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}
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};
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/*/!**
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* Identify where the start of the middle / payload section starts.
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*
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* @param row row of black/white values to search
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* @return Array, containing index of start of 'start block' and end of
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* 'start block'
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*!/*/
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ITFReader.prototype.decodeStart = function (row) {
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var endStart = ITFReader.skipWhiteSpace(row);
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var startPattern = ITFReader.findGuardPattern(row, endStart, ITFReader.START_PATTERN);
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// Determine the width of a narrow line in pixels. We can do this by
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// getting the width of the start pattern and dividing by 4 because its
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// made up of 4 narrow lines.
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this.narrowLineWidth = (startPattern[1] - startPattern[0]) / 4;
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this.validateQuietZone(row, startPattern[0]);
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return startPattern;
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};
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/*/!**
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* The start & end patterns must be pre/post fixed by a quiet zone. This
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* zone must be at least 10 times the width of a narrow line. Scan back until
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* we either get to the start of the barcode or match the necessary number of
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* quiet zone pixels.
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*
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* Note: Its assumed the row is reversed when using this method to find
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* quiet zone after the end pattern.
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*
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* ref: http://www.barcode-1.net/i25code.html
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*
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* @param row bit array representing the scanned barcode.
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* @param startPattern index into row of the start or end pattern.
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* @throws NotFoundException if the quiet zone cannot be found
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*!/*/
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ITFReader.prototype.validateQuietZone = function (row, startPattern) {
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var quietCount = this.narrowLineWidth * 10; // expect to find this many pixels of quiet zone
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// if there are not so many pixel at all let's try as many as possible
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quietCount = quietCount < startPattern ? quietCount : startPattern;
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for (var i = startPattern - 1; quietCount > 0 && i >= 0; i--) {
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if (row.get(i)) {
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break;
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}
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quietCount--;
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}
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if (quietCount !== 0) {
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// Unable to find the necessary number of quiet zone pixels.
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throw new NotFoundException_1.default();
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}
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};
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/*
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/!**
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* Skip all whitespace until we get to the first black line.
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*
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* @param row row of black/white values to search
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* @return index of the first black line.
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* @throws NotFoundException Throws exception if no black lines are found in the row
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*!/*/
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ITFReader.skipWhiteSpace = function (row) {
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var width = row.getSize();
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var endStart = row.getNextSet(0);
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if (endStart === width) {
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throw new NotFoundException_1.default();
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}
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return endStart;
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};
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/*/!**
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* Identify where the end of the middle / payload section ends.
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*
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* @param row row of black/white values to search
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* @return Array, containing index of start of 'end block' and end of 'end
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* block'
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*!/*/
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ITFReader.prototype.decodeEnd = function (row) {
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// For convenience, reverse the row and then
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// search from 'the start' for the end block
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row.reverse();
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try {
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var endStart = ITFReader.skipWhiteSpace(row);
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var endPattern = void 0;
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try {
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endPattern = ITFReader.findGuardPattern(row, endStart, ITFReader.END_PATTERN_REVERSED[0]);
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}
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catch (error) {
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if (error instanceof NotFoundException_1.default) {
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endPattern = ITFReader.findGuardPattern(row, endStart, ITFReader.END_PATTERN_REVERSED[1]);
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}
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}
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// The start & end patterns must be pre/post fixed by a quiet zone. This
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// zone must be at least 10 times the width of a narrow line.
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// ref: http://www.barcode-1.net/i25code.html
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this.validateQuietZone(row, endPattern[0]);
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// Now recalculate the indices of where the 'endblock' starts & stops to
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// accommodate
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// the reversed nature of the search
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var temp = endPattern[0];
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endPattern[0] = row.getSize() - endPattern[1];
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endPattern[1] = row.getSize() - temp;
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return endPattern;
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}
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finally {
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// Put the row back the right way.
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row.reverse();
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}
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};
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/*
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/!**
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* @param row row of black/white values to search
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* @param rowOffset position to start search
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* @param pattern pattern of counts of number of black and white pixels that are
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* being searched for as a pattern
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* @return start/end horizontal offset of guard pattern, as an array of two
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* ints
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* @throws NotFoundException if pattern is not found
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*!/*/
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ITFReader.findGuardPattern = function (row, rowOffset, pattern) {
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var patternLength = pattern.length;
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var counters = new Int32Array(patternLength);
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var width = row.getSize();
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var isWhite = false;
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var counterPosition = 0;
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var patternStart = rowOffset;
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counters.fill(0);
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for (var x = rowOffset; x < width; x++) {
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if (row.get(x) !== isWhite) {
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counters[counterPosition]++;
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}
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else {
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if (counterPosition === patternLength - 1) {
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if (OneDReader_1.default.patternMatchVariance(counters, pattern, ITFReader.MAX_INDIVIDUAL_VARIANCE) < ITFReader.MAX_AVG_VARIANCE) {
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return [patternStart, x];
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}
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patternStart += counters[0] + counters[1];
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System_1.default.arraycopy(counters, 2, counters, 0, counterPosition - 1);
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counters[counterPosition - 1] = 0;
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counters[counterPosition] = 0;
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counterPosition--;
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}
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else {
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counterPosition++;
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}
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counters[counterPosition] = 1;
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isWhite = !isWhite;
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}
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}
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throw new NotFoundException_1.default();
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};
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/*/!**
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* Attempts to decode a sequence of ITF black/white lines into single
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* digit.
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*
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* @param counters the counts of runs of observed black/white/black/... values
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* @return The decoded digit
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* @throws NotFoundException if digit cannot be decoded
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*!/*/
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ITFReader.decodeDigit = function (counters) {
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var bestVariance = ITFReader.MAX_AVG_VARIANCE; // worst variance we'll accept
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var bestMatch = -1;
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var max = ITFReader.PATTERNS.length;
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for (var i = 0; i < max; i++) {
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var pattern = ITFReader.PATTERNS[i];
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var variance = OneDReader_1.default.patternMatchVariance(counters, pattern, ITFReader.MAX_INDIVIDUAL_VARIANCE);
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if (variance < bestVariance) {
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bestVariance = variance;
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bestMatch = i;
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}
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else if (variance === bestVariance) {
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// if we find a second 'best match' with the same variance, we can not reliably report to have a suitable match
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bestMatch = -1;
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}
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}
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if (bestMatch >= 0) {
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return bestMatch % 10;
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}
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else {
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throw new NotFoundException_1.default();
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}
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};
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ITFReader.PATTERNS = [
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Int32Array.from([1, 1, 2, 2, 1]),
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Int32Array.from([2, 1, 1, 1, 2]),
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Int32Array.from([1, 2, 1, 1, 2]),
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Int32Array.from([2, 2, 1, 1, 1]),
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Int32Array.from([1, 1, 2, 1, 2]),
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Int32Array.from([2, 1, 2, 1, 1]),
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Int32Array.from([1, 2, 2, 1, 1]),
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Int32Array.from([1, 1, 1, 2, 2]),
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Int32Array.from([2, 1, 1, 2, 1]),
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Int32Array.from([1, 2, 1, 2, 1]),
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Int32Array.from([1, 1, 3, 3, 1]),
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Int32Array.from([3, 1, 1, 1, 3]),
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Int32Array.from([1, 3, 1, 1, 3]),
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Int32Array.from([3, 3, 1, 1, 1]),
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Int32Array.from([1, 1, 3, 1, 3]),
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Int32Array.from([3, 1, 3, 1, 1]),
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Int32Array.from([1, 3, 3, 1, 1]),
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Int32Array.from([1, 1, 1, 3, 3]),
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Int32Array.from([3, 1, 1, 3, 1]),
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Int32Array.from([1, 3, 1, 3, 1]) // 9
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];
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ITFReader.MAX_AVG_VARIANCE = 0.38;
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ITFReader.MAX_INDIVIDUAL_VARIANCE = 0.5;
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/* /!** Valid ITF lengths. Anything longer than the largest value is also allowed. *!/*/
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ITFReader.DEFAULT_ALLOWED_LENGTHS = [6, 8, 10, 12, 14];
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/*/!**
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* Start/end guard pattern.
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*
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* Note: The end pattern is reversed because the row is reversed before
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* searching for the END_PATTERN
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*!/*/
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ITFReader.START_PATTERN = Int32Array.from([1, 1, 1, 1]);
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ITFReader.END_PATTERN_REVERSED = [
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Int32Array.from([1, 1, 2]),
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Int32Array.from([1, 1, 3]) // 3x
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];
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return ITFReader;
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}(OneDReader_1.default));
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exports.default = ITFReader;
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