@iotize/device-client.js/device/extra-converter/ByteSwapConverter.js

IoTize Device client for Javascript

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.BYTE_SWAP_ORDER_REGEX = /^(B[0-9]+)(_B[0-9]+)*$/;
var ByteSwapConverter = /** @class */ (function () {
    function ByteSwapConverter(order) {
        this.order = order;
    }
    ByteSwapConverter.prototype.encode = function (input) {
        return swapBytes(input, this.order);
    };
    ByteSwapConverter.prototype.decode = function (input) {
        return this.encode(input);
    };
    return ByteSwapConverter;
}());
exports.ByteSwapConverter = ByteSwapConverter;
/**
 * This function is symetric
 *
 * If we have array A,B,C,D with swap order B2_B3_B0_B1 it returns B,A,D,C
 *
 * @param input array
 * @param order string that defined how to swap bytes
 * @return a new array with byte swap
 */
function swapBytes(input, order) {
    if (!order.match(exports.BYTE_SWAP_ORDER_REGEX)) {
        throw new Error("Invalid byte order: " + order + ". Should match regex " + exports.BYTE_SWAP_ORDER_REGEX);
    }
    var parts = order.split("_");
    var indexMap = parts.reduce(function (prev, current, index) {
        prev[current] = index;
        return prev;
    }, {});
    if (parts.length != input.length) {
        throw new Error("Expection " + parts.length + " bytes but found " + input.length + " bytes");
    }
    var result = new Uint8Array(input.length);
    // let maxLength = Math.min(parts.length, input.length)
    for (var index = 0; index < result.length; index++) {
        result[indexMap["B" + (result.length - index - 1)]] = input[index];
    }
    return result;
}
exports.swapBytes = swapBytes;