@zxing/library
Version:
TypeScript port of ZXing multi-format 1D/2D barcode image processing library.
171 lines (170 loc) • 8.01 kB
JavaScript
"use strict";
/*
* 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 __());
};
})();
Object.defineProperty(exports, "__esModule", { value: true });
var BarcodeFormat_1 = require("../BarcodeFormat");
var DecodeHintType_1 = require("../DecodeHintType");
var Result_1 = require("../Result");
var ResultMetadataType_1 = require("../ResultMetadataType");
var ResultPoint_1 = require("../ResultPoint");
var UPCEANExtensionSupport_1 = require("./UPCEANExtensionSupport");
var AbstractUPCEANReader_1 = require("./AbstractUPCEANReader");
var NotFoundException_1 = require("../NotFoundException");
var FormatException_1 = require("../FormatException");
var ChecksumException_1 = require("../ChecksumException");
/**
* <p>Encapsulates functionality and implementation that is common to UPC and EAN families
* of one-dimensional barcodes.</p>
*
* @author dswitkin@google.com (Daniel Switkin)
* @author Sean Owen
* @author alasdair@google.com (Alasdair Mackintosh)
*/
var UPCEANReader = /** @class */ (function (_super) {
__extends(UPCEANReader, _super);
function UPCEANReader() {
var _this = _super.call(this) || this;
_this.decodeRowStringBuffer = '';
UPCEANReader.L_AND_G_PATTERNS = UPCEANReader.L_PATTERNS.map(function (arr) { return Int32Array.from(arr); });
for (var i = 10; i < 20; i++) {
var widths = UPCEANReader.L_PATTERNS[i - 10];
var reversedWidths = new Int32Array(widths.length);
for (var j = 0; j < widths.length; j++) {
reversedWidths[j] = widths[widths.length - j - 1];
}
UPCEANReader.L_AND_G_PATTERNS[i] = reversedWidths;
}
return _this;
}
UPCEANReader.prototype.decodeRow = function (rowNumber, row, hints) {
var startGuardRange = UPCEANReader.findStartGuardPattern(row);
var resultPointCallback = hints == null ? null : hints.get(DecodeHintType_1.default.NEED_RESULT_POINT_CALLBACK);
if (resultPointCallback != null) {
var resultPoint_1 = new ResultPoint_1.default((startGuardRange[0] + startGuardRange[1]) / 2.0, rowNumber);
resultPointCallback.foundPossibleResultPoint(resultPoint_1);
}
var budello = this.decodeMiddle(row, startGuardRange, this.decodeRowStringBuffer);
var endStart = budello.rowOffset;
var result = budello.resultString;
if (resultPointCallback != null) {
var resultPoint_2 = new ResultPoint_1.default(endStart, rowNumber);
resultPointCallback.foundPossibleResultPoint(resultPoint_2);
}
var endRange = UPCEANReader.decodeEnd(row, endStart);
if (resultPointCallback != null) {
var resultPoint_3 = new ResultPoint_1.default((endRange[0] + endRange[1]) / 2.0, rowNumber);
resultPointCallback.foundPossibleResultPoint(resultPoint_3);
}
// Make sure there is a quiet zone at least as big as the end pattern after the barcode. The
// spec might want more whitespace, but in practice this is the maximum we can count on.
var end = endRange[1];
var quietEnd = end + (end - endRange[0]);
if (quietEnd >= row.getSize() || !row.isRange(end, quietEnd, false)) {
throw new NotFoundException_1.default();
}
var resultString = result.toString();
// UPC/EAN should never be less than 8 chars anyway
if (resultString.length < 8) {
throw new FormatException_1.default();
}
if (!UPCEANReader.checkChecksum(resultString)) {
throw new ChecksumException_1.default();
}
var left = (startGuardRange[1] + startGuardRange[0]) / 2.0;
var right = (endRange[1] + endRange[0]) / 2.0;
var format = this.getBarcodeFormat();
var resultPoint = [new ResultPoint_1.default(left, rowNumber), new ResultPoint_1.default(right, rowNumber)];
var decodeResult = new Result_1.default(resultString, null, 0, resultPoint, format, new Date().getTime());
var extensionLength = 0;
try {
var extensionResult = UPCEANExtensionSupport_1.default.decodeRow(rowNumber, row, endRange[1]);
decodeResult.putMetadata(ResultMetadataType_1.default.UPC_EAN_EXTENSION, extensionResult.getText());
decodeResult.putAllMetadata(extensionResult.getResultMetadata());
decodeResult.addResultPoints(extensionResult.getResultPoints());
extensionLength = extensionResult.getText().length;
}
catch (err) {
}
var allowedExtensions = hints == null ? null : hints.get(DecodeHintType_1.default.ALLOWED_EAN_EXTENSIONS);
if (allowedExtensions != null) {
var valid = false;
for (var length_1 in allowedExtensions) {
if (extensionLength.toString() === length_1) { // check me
valid = true;
break;
}
}
if (!valid) {
throw new NotFoundException_1.default();
}
}
if (format === BarcodeFormat_1.default.EAN_13 || format === BarcodeFormat_1.default.UPC_A) {
// let countryID = eanManSupport.lookupContryIdentifier(resultString); todo
// if (countryID != null) {
// decodeResult.putMetadata(ResultMetadataType.POSSIBLE_COUNTRY, countryID);
// }
}
return decodeResult;
};
UPCEANReader.checkChecksum = function (s) {
return UPCEANReader.checkStandardUPCEANChecksum(s);
};
UPCEANReader.checkStandardUPCEANChecksum = function (s) {
var length = s.length;
if (length === 0)
return false;
var check = parseInt(s.charAt(length - 1), 10);
return UPCEANReader.getStandardUPCEANChecksum(s.substring(0, length - 1)) === check;
};
UPCEANReader.getStandardUPCEANChecksum = function (s) {
var length = s.length;
var sum = 0;
for (var i = length - 1; i >= 0; i -= 2) {
var digit = s.charAt(i).charCodeAt(0) - '0'.charCodeAt(0);
if (digit < 0 || digit > 9) {
throw new FormatException_1.default();
}
sum += digit;
}
sum *= 3;
for (var i = length - 2; i >= 0; i -= 2) {
var digit = s.charAt(i).charCodeAt(0) - '0'.charCodeAt(0);
if (digit < 0 || digit > 9) {
throw new FormatException_1.default();
}
sum += digit;
}
return (1000 - sum) % 10;
};
UPCEANReader.decodeEnd = function (row, endStart) {
return UPCEANReader.findGuardPattern(row, endStart, false, UPCEANReader.START_END_PATTERN, new Int32Array(UPCEANReader.START_END_PATTERN.length).fill(0));
};
return UPCEANReader;
}(AbstractUPCEANReader_1.default));
exports.default = UPCEANReader;