@zxing/library
Version:
TypeScript port of ZXing multi-format 1D/2D barcode image processing library.
59 lines (58 loc) • 1.96 kB
JavaScript
;
/*
* Copyright 2007 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.
*/
Object.defineProperty(exports, "__esModule", { value: true });
var IllegalArgumentException_1 = require("../../IllegalArgumentException");
/**
* <p>This class contains utility methods for performing mathematical operations over
* the Galois Fields. Operations use a given primitive polynomial in calculations.</p>
*
* <p>Throughout this package, elements of the GF are represented as an {@code int}
* for convenience and speed (but at the cost of memory).
* </p>
*
* @author Sean Owen
* @author David Olivier
*/
var AbstractGenericGF = /** @class */ (function () {
function AbstractGenericGF() {
}
/**
* @return 2 to the power of a in GF(size)
*/
AbstractGenericGF.prototype.exp = function (a) {
return this.expTable[a];
};
/**
* @return base 2 log of a in GF(size)
*/
AbstractGenericGF.prototype.log = function (a /*int*/) {
if (a === 0) {
throw new IllegalArgumentException_1.default();
}
return this.logTable[a];
};
/**
* Implements both addition and subtraction -- they are the same in GF(size).
*
* @return sum/difference of a and b
*/
AbstractGenericGF.addOrSubtract = function (a /*int*/, b /*int*/) {
return a ^ b;
};
return AbstractGenericGF;
}());
exports.default = AbstractGenericGF;