node-buzzers/dist/parser/mapDeviceDataToPressedButtons.js

Forked version of 'buzz-buzzers', updated and upgraded to support multiple USB dongles

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const mappings_1 = require("./mappings");
// Generate powers of two array
const powerOfTwo = [];
for (let i = 0; i < 32; i++) {
    powerOfTwo[i] = Math.pow(2, i);
}
/**
 * Read a single byte value (e.g. 0, 8, 240...)
 * @param byte {number}
 * @returns An array of 8 booleans
 */
function readByte(byte) {
    const result = [false, false, false, false, false, false, false, false];
    for (let i = 7; i >= 0; i--) {
        if (byte & powerOfTwo[i]) {
            result[7 - i] = true;
        }
    }
    return result;
}
/**
 * Converts a Buffer into an array of array of booleans
 * @param byteArray {Buffer} e.g. <Buffer 00 00 00 00 f0>
 * @returns An array with 5 arrays of 8 booleans (5 x 8 = 40)
 */
function bufferToBooleans(byteArray) {
    return Array.from(byteArray).map((byte) => readByte(byte));
}
const mapDeviceDataToPressedButtons = () => {
    /**
     * Helper function to convert Buffer data using buzzer mappings
     * @returns an array of 20 booleans (5 buttons x 4 buzzers)
     */
    const callbackMapper = (pressedBuffer) => {
        const bytes = bufferToBooleans(pressedBuffer);
        return mappings_1.mappings.map((btn) => Boolean(bytes[btn.bytes[0]][btn.bytes[1]]));
    };
    return callbackMapper;
};
exports.default = mapDeviceDataToPressedButtons;
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