@zxing/library
Version:
TypeScript port of ZXing multi-format 1D/2D barcode image processing library.
149 lines (148 loc) • 5.98 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.
*/
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 });
/*namespace com.google.zxing.common.reedsolomon {*/
var GenericGFPoly_1 = require("./GenericGFPoly");
var AbstractGenericGF_1 = require("./AbstractGenericGF");
var Integer_1 = require("../../util/Integer");
var IllegalArgumentException_1 = require("../../IllegalArgumentException");
var ArithmeticException_1 = require("../../ArithmeticException");
/**
* <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 GenericGF = /** @class */ (function (_super) {
__extends(GenericGF, _super);
/**
* Create a representation of GF(size) using the given primitive polynomial.
*
* @param primitive irreducible polynomial whose coefficients are represented by
* the bits of an int, where the least-significant bit represents the constant
* coefficient
* @param size the size of the field
* @param b the factor b in the generator polynomial can be 0- or 1-based
* (g(x) = (x+a^b)(x+a^(b+1))...(x+a^(b+2t-1))).
* In most cases it should be 1, but for QR code it is 0.
*/
function GenericGF(primitive /*int*/, size /*int*/, generatorBase /*int*/) {
var _this = _super.call(this) || this;
_this.primitive = primitive;
_this.size = size;
_this.generatorBase = generatorBase;
var expTable = new Int32Array(size);
var x = 1;
for (var i = 0; i < size; i++) {
expTable[i] = x;
x *= 2; // we're assuming the generator alpha is 2
if (x >= size) {
x ^= primitive;
x &= size - 1;
}
}
_this.expTable = expTable;
var logTable = new Int32Array(size);
for (var i = 0; i < size - 1; i++) {
logTable[expTable[i]] = i;
}
_this.logTable = logTable;
// logTable[0] == 0 but this should never be used
_this.zero = new GenericGFPoly_1.default(_this, Int32Array.from([0]));
_this.one = new GenericGFPoly_1.default(_this, Int32Array.from([1]));
return _this;
}
GenericGF.prototype.getZero = function () {
return this.zero;
};
GenericGF.prototype.getOne = function () {
return this.one;
};
/**
* @return the monomial representing coefficient * x^degree
*/
GenericGF.prototype.buildMonomial = function (degree /*int*/, coefficient /*int*/) {
if (degree < 0) {
throw new IllegalArgumentException_1.default();
}
if (coefficient === 0) {
return this.zero;
}
var coefficients = new Int32Array(degree + 1);
coefficients[0] = coefficient;
return new GenericGFPoly_1.default(this, coefficients);
};
/**
* @return multiplicative inverse of a
*/
GenericGF.prototype.inverse = function (a /*int*/) {
if (a === 0) {
throw new ArithmeticException_1.default();
}
return this.expTable[this.size - this.logTable[a] - 1];
};
/**
* @return product of a and b in GF(size)
*/
GenericGF.prototype.multiply = function (a /*int*/, b /*int*/) {
if (a === 0 || b === 0) {
return 0;
}
return this.expTable[(this.logTable[a] + this.logTable[b]) % (this.size - 1)];
};
GenericGF.prototype.getSize = function () {
return this.size;
};
GenericGF.prototype.getGeneratorBase = function () {
return this.generatorBase;
};
/*@Override*/
GenericGF.prototype.toString = function () {
return ('GF(0x' + Integer_1.default.toHexString(this.primitive) + ',' + this.size + ')');
};
GenericGF.prototype.equals = function (o) {
return o === this;
};
GenericGF.AZTEC_DATA_12 = new GenericGF(0x1069, 4096, 1); // x^12 + x^6 + x^5 + x^3 + 1
GenericGF.AZTEC_DATA_10 = new GenericGF(0x409, 1024, 1); // x^10 + x^3 + 1
GenericGF.AZTEC_DATA_6 = new GenericGF(0x43, 64, 1); // x^6 + x + 1
GenericGF.AZTEC_PARAM = new GenericGF(0x13, 16, 1); // x^4 + x + 1
GenericGF.QR_CODE_FIELD_256 = new GenericGF(0x011d, 256, 0); // x^8 + x^4 + x^3 + x^2 + 1
GenericGF.DATA_MATRIX_FIELD_256 = new GenericGF(0x012d, 256, 1); // x^8 + x^5 + x^3 + x^2 + 1
GenericGF.AZTEC_DATA_8 = GenericGF.DATA_MATRIX_FIELD_256;
GenericGF.MAXICODE_FIELD_64 = GenericGF.AZTEC_DATA_6;
return GenericGF;
}(AbstractGenericGF_1.default));
exports.default = GenericGF;