lifehash/src/lifehash/Pattern.js

TypeScript/JavaScript implementation of LifeHash, a visual hash algorithm

import { LifeHashVersion } from './types/LifeHashVersion.js';
export var PatternType;
(function (PatternType) {
    PatternType[PatternType["snowflake"] = 0] = "snowflake";
    PatternType[PatternType["pinwheel"] = 1] = "pinwheel";
    PatternType[PatternType["fiducial"] = 2] = "fiducial";
})(PatternType || (PatternType = {}));
export class Pattern {
    static select_pattern(entropy, version) {
        if ([LifeHashVersion.fiducial, LifeHashVersion.grayscale_fiducial].includes(version)) {
            return PatternType.fiducial;
        }
        else {
            if (entropy.next()) {
                return PatternType.snowflake;
            }
            else {
                return PatternType.pinwheel;
            }
        }
    }
}