tsgammon-core/utils/decodeMatchID.js

A Backgammon library for Typescript, formerly developed as a part of tsgammon-ui

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.decodeMatchID = void 0;
const base64_1 = require("@borderless/base64");
/**
 * Gnu Backgammon仕様のMatchIDを解析し、各項目の情報を返す。
 * @param matchID MatchIDないし任意の文字列
 * @returns 解析結果：内容のチェックはしないので、どの文字列にたいしても何らかの結果が返る
 */
function decodeMatchID(matchID) {
    const decoded = new Uint8Array((0, base64_1.decode)(matchID.substring(0, 14)));
    const cube = decoded[0] & 15;
    const cubeOwner = (decoded[0] >> 4) & 3;
    const diceOwner = (decoded[0] >> 6) & 1;
    const crawford = (decoded[0] >> 7) & 1;
    const gameState = decoded[1] & 7;
    const turnOwner = (decoded[1] >> 3) & 1;
    const double = (decoded[1] >> 4) & 1;
    const resign = (decoded[1] >> 5) & 3;
    const dice1 = ((decoded[2] & 3) << 1) | ((decoded[1] >> 7) & 1);
    const dice2 = (decoded[2] >> 2) & 7;
    const matchLen = ((decoded[4] & 15) << 11) |
        ((decoded[3] & 255) << 3) |
        ((decoded[2] >> 5) & 7);
    const score1 = ((decoded[6] & 7) << 12) |
        ((decoded[5] & 255) << 4) |
        ((decoded[4] >> 4) & 15);
    const score2 = ((decoded[8] & 3) << 13) |
        ((decoded[7] & 255) << 5) |
        ((decoded[6] >> 3) & 31);
    const noJacoby = (decoded[8] >> 2) & 1;
    return {
        cube,
        cubeOwner,
        diceOwner,
        crawford,
        gameState,
        turnOwner,
        double,
        resign,
        dice1,
        dice2,
        matchLen,
        score1,
        score2,
        noJacoby,
    };
}
exports.decodeMatchID = decodeMatchID;