/*
|
* Copyright 2012 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.
|
*/
|
// package com.google.zxing.pdf417.decoder.ec;
|
// import com.google.zxing.pdf417.PDF417Common;
|
import PDF417Common from '../../PDF417Common';
|
import ModulusPoly from './ModulusPoly';
|
import IllegalArgumentException from '../../../IllegalArgumentException';
|
import ModulusBase from './ModulusBase';
|
/**
|
* <p>A field based on powers of a generator integer, modulo some modulus.</p>
|
*
|
* @author Sean Owen
|
* @see com.google.zxing.common.reedsolomon.GenericGF
|
*/
|
export default /*public final*/ class ModulusGF extends ModulusBase {
|
// private /*final*/ modulus: /*int*/ number;
|
constructor(modulus, generator) {
|
super();
|
this.modulus = modulus;
|
this.expTable = new Int32Array(modulus);
|
this.logTable = new Int32Array(modulus);
|
let x = /*int*/ 1;
|
for (let i /*int*/ = 0; i < modulus; i++) {
|
this.expTable[i] = x;
|
x = (x * generator) % modulus;
|
}
|
for (let i /*int*/ = 0; i < modulus - 1; i++) {
|
this.logTable[this.expTable[i]] = i;
|
}
|
// logTable[0] == 0 but this should never be used
|
this.zero = new ModulusPoly(this, new Int32Array([0]));
|
this.one = new ModulusPoly(this, new Int32Array([1]));
|
}
|
getZero() {
|
return this.zero;
|
}
|
getOne() {
|
return this.one;
|
}
|
buildMonomial(degree, coefficient) {
|
if (degree < 0) {
|
throw new IllegalArgumentException();
|
}
|
if (coefficient === 0) {
|
return this.zero;
|
}
|
let coefficients = new Int32Array(degree + 1);
|
coefficients[0] = coefficient;
|
return new ModulusPoly(this, coefficients);
|
}
|
}
|
ModulusGF.PDF417_GF = new ModulusGF(PDF417Common.NUMBER_OF_CODEWORDS, 3);
|