/*
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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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import BarcodeFormat from '../BarcodeFormat';
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import DecodeHintType from '../DecodeHintType';
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import Result from '../Result';
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import ResultMetadataType from '../ResultMetadataType';
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import ResultPoint from '../ResultPoint';
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import UPCEANExtensionSupport from './UPCEANExtensionSupport';
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import AbstractUPCEANReader from './AbstractUPCEANReader';
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import NotFoundException from '../NotFoundException';
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import FormatException from '../FormatException';
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import ChecksumException from '../ChecksumException';
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/**
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* <p>Encapsulates functionality and implementation that is common to UPC and EAN families
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* of one-dimensional barcodes.</p>
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*
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* @author dswitkin@google.com (Daniel Switkin)
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* @author Sean Owen
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* @author alasdair@google.com (Alasdair Mackintosh)
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*/
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export default class UPCEANReader extends AbstractUPCEANReader {
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constructor() {
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super();
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this.decodeRowStringBuffer = '';
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UPCEANReader.L_AND_G_PATTERNS = UPCEANReader.L_PATTERNS.map(arr => Int32Array.from(arr));
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for (let i = 10; i < 20; i++) {
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let widths = UPCEANReader.L_PATTERNS[i - 10];
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let reversedWidths = new Int32Array(widths.length);
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for (let j = 0; j < widths.length; j++) {
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reversedWidths[j] = widths[widths.length - j - 1];
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}
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UPCEANReader.L_AND_G_PATTERNS[i] = reversedWidths;
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}
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}
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decodeRow(rowNumber, row, hints) {
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let startGuardRange = UPCEANReader.findStartGuardPattern(row);
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let resultPointCallback = hints == null ? null : hints.get(DecodeHintType.NEED_RESULT_POINT_CALLBACK);
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if (resultPointCallback != null) {
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const resultPoint = new ResultPoint((startGuardRange[0] + startGuardRange[1]) / 2.0, rowNumber);
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resultPointCallback.foundPossibleResultPoint(resultPoint);
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}
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let budello = this.decodeMiddle(row, startGuardRange, this.decodeRowStringBuffer);
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let endStart = budello.rowOffset;
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let result = budello.resultString;
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if (resultPointCallback != null) {
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const resultPoint = new ResultPoint(endStart, rowNumber);
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resultPointCallback.foundPossibleResultPoint(resultPoint);
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}
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let endRange = UPCEANReader.decodeEnd(row, endStart);
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if (resultPointCallback != null) {
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const resultPoint = new ResultPoint((endRange[0] + endRange[1]) / 2.0, rowNumber);
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resultPointCallback.foundPossibleResultPoint(resultPoint);
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}
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// Make sure there is a quiet zone at least as big as the end pattern after the barcode. The
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// spec might want more whitespace, but in practice this is the maximum we can count on.
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let end = endRange[1];
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let quietEnd = end + (end - endRange[0]);
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if (quietEnd >= row.getSize() || !row.isRange(end, quietEnd, false)) {
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throw new NotFoundException();
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}
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let resultString = result.toString();
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// UPC/EAN should never be less than 8 chars anyway
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if (resultString.length < 8) {
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throw new FormatException();
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}
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if (!UPCEANReader.checkChecksum(resultString)) {
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throw new ChecksumException();
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}
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let left = (startGuardRange[1] + startGuardRange[0]) / 2.0;
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let right = (endRange[1] + endRange[0]) / 2.0;
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let format = this.getBarcodeFormat();
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let resultPoint = [new ResultPoint(left, rowNumber), new ResultPoint(right, rowNumber)];
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let decodeResult = new Result(resultString, null, 0, resultPoint, format, new Date().getTime());
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let extensionLength = 0;
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try {
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let extensionResult = UPCEANExtensionSupport.decodeRow(rowNumber, row, endRange[1]);
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decodeResult.putMetadata(ResultMetadataType.UPC_EAN_EXTENSION, extensionResult.getText());
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decodeResult.putAllMetadata(extensionResult.getResultMetadata());
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decodeResult.addResultPoints(extensionResult.getResultPoints());
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extensionLength = extensionResult.getText().length;
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}
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catch (err) {
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}
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let allowedExtensions = hints == null ? null : hints.get(DecodeHintType.ALLOWED_EAN_EXTENSIONS);
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if (allowedExtensions != null) {
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let valid = false;
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for (let length in allowedExtensions) {
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if (extensionLength.toString() === length) { // check me
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valid = true;
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break;
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}
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}
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if (!valid) {
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throw new NotFoundException();
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}
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}
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if (format === BarcodeFormat.EAN_13 || format === BarcodeFormat.UPC_A) {
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// let countryID = eanManSupport.lookupContryIdentifier(resultString); todo
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// if (countryID != null) {
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// decodeResult.putMetadata(ResultMetadataType.POSSIBLE_COUNTRY, countryID);
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// }
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}
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return decodeResult;
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}
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static checkChecksum(s) {
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return UPCEANReader.checkStandardUPCEANChecksum(s);
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}
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static checkStandardUPCEANChecksum(s) {
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let length = s.length;
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if (length === 0)
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return false;
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let check = parseInt(s.charAt(length - 1), 10);
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return UPCEANReader.getStandardUPCEANChecksum(s.substring(0, length - 1)) === check;
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}
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static getStandardUPCEANChecksum(s) {
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let length = s.length;
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let sum = 0;
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for (let i = length - 1; i >= 0; i -= 2) {
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let digit = s.charAt(i).charCodeAt(0) - '0'.charCodeAt(0);
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if (digit < 0 || digit > 9) {
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throw new FormatException();
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}
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sum += digit;
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}
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sum *= 3;
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for (let i = length - 2; i >= 0; i -= 2) {
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let digit = s.charAt(i).charCodeAt(0) - '0'.charCodeAt(0);
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if (digit < 0 || digit > 9) {
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throw new FormatException();
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}
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sum += digit;
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}
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return (1000 - sum) % 10;
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}
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static decodeEnd(row, endStart) {
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return UPCEANReader.findGuardPattern(row, endStart, false, UPCEANReader.START_END_PATTERN, new Int32Array(UPCEANReader.START_END_PATTERN.length).fill(0));
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}
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}
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