/*
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* Copyright (C) 2010 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 UPCEANReader from './UPCEANReader';
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import AbstractUPCEANReader from './AbstractUPCEANReader';
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import Result from '../Result';
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import ResultPoint from '../ResultPoint';
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import ResultMetadataType from '../ResultMetadataType';
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import NotFoundException from '../NotFoundException';
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/**
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* @see UPCEANExtension2Support
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*/
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export default class UPCEANExtension5Support {
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constructor() {
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this.CHECK_DIGIT_ENCODINGS = [0x18, 0x14, 0x12, 0x11, 0x0C, 0x06, 0x03, 0x0A, 0x09, 0x05];
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this.decodeMiddleCounters = Int32Array.from([0, 0, 0, 0]);
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this.decodeRowStringBuffer = '';
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}
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decodeRow(rowNumber, row, extensionStartRange) {
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let result = this.decodeRowStringBuffer;
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let end = this.decodeMiddle(row, extensionStartRange, result);
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let resultString = result.toString();
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let extensionData = UPCEANExtension5Support.parseExtensionString(resultString);
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let resultPoints = [
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new ResultPoint((extensionStartRange[0] + extensionStartRange[1]) / 2.0, rowNumber),
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new ResultPoint(end, rowNumber)
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];
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let extensionResult = new Result(resultString, null, 0, resultPoints, BarcodeFormat.UPC_EAN_EXTENSION, new Date().getTime());
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if (extensionData != null) {
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extensionResult.putAllMetadata(extensionData);
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}
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return extensionResult;
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}
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decodeMiddle(row, startRange, resultString) {
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let counters = this.decodeMiddleCounters;
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counters[0] = 0;
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counters[1] = 0;
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counters[2] = 0;
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counters[3] = 0;
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let end = row.getSize();
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let rowOffset = startRange[1];
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let lgPatternFound = 0;
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for (let x = 0; x < 5 && rowOffset < end; x++) {
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let bestMatch = AbstractUPCEANReader.decodeDigit(row, counters, rowOffset, AbstractUPCEANReader.L_AND_G_PATTERNS);
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resultString += String.fromCharCode(('0'.charCodeAt(0) + bestMatch % 10));
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for (let counter of counters) {
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rowOffset += counter;
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}
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if (bestMatch >= 10) {
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lgPatternFound |= 1 << (4 - x);
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}
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if (x !== 4) {
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// Read off separator if not last
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rowOffset = row.getNextSet(rowOffset);
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rowOffset = row.getNextUnset(rowOffset);
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}
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}
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if (resultString.length !== 5) {
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throw new NotFoundException();
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}
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let checkDigit = this.determineCheckDigit(lgPatternFound);
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if (UPCEANExtension5Support.extensionChecksum(resultString.toString()) !== checkDigit) {
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throw new NotFoundException();
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}
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return rowOffset;
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}
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static extensionChecksum(s) {
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let length = s.length;
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let sum = 0;
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for (let i = length - 2; i >= 0; i -= 2) {
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sum += s.charAt(i).charCodeAt(0) - '0'.charCodeAt(0);
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}
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sum *= 3;
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for (let i = length - 1; i >= 0; i -= 2) {
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sum += s.charAt(i).charCodeAt(0) - '0'.charCodeAt(0);
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}
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sum *= 3;
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return sum % 10;
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}
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determineCheckDigit(lgPatternFound) {
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for (let d = 0; d < 10; d++) {
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if (lgPatternFound === this.CHECK_DIGIT_ENCODINGS[d]) {
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return d;
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}
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}
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throw new NotFoundException();
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}
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static parseExtensionString(raw) {
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if (raw.length !== 5) {
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return null;
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}
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let value = UPCEANExtension5Support.parseExtension5String(raw);
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if (value == null) {
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return null;
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}
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return new Map([[ResultMetadataType.SUGGESTED_PRICE, value]]);
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}
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static parseExtension5String(raw) {
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let currency;
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switch (raw.charAt(0)) {
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case '0':
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currency = '£';
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break;
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case '5':
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currency = '$';
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break;
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case '9':
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// Reference: http://www.jollytech.com
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switch (raw) {
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case '90000':
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// No suggested retail price
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return null;
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case '99991':
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// Complementary
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return '0.00';
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case '99990':
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return 'Used';
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}
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// Otherwise... unknown currency?
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currency = '';
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break;
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default:
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currency = '';
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break;
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}
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let rawAmount = parseInt(raw.substring(1));
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let unitsString = (rawAmount / 100).toString();
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let hundredths = rawAmount % 100;
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let hundredthsString = hundredths < 10 ? '0' + hundredths : hundredths.toString(); // fixme
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return currency + unitsString + '.' + hundredthsString;
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}
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}
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