@iota/signing/out/signing/src/add.js

IOTA Signing Scheme

"use strict";
/* copyright Paul Handy, 2017 */
exports.__esModule = true;
/* tslint:disable variable-name */
function sum(a, b) {
    var s = a + b;
    switch (s) {
        case 2:
            return -1;
        case -2:
            return 1;
        default:
            return s;
    }
}
function cons(a, b) {
    if (a === b) {
        return a;
    }
    return 0;
}
function any(a, b) {
    var s = a + b;
    if (s > 0) {
        return 1;
    }
    else if (s < 0) {
        return -1;
    }
    return 0;
}
function full_add(a, b, c) {
    var s_a = sum(a, b);
    var c_a = cons(a, b);
    var c_b = cons(s_a, c);
    var c_out = any(c_a, c_b);
    var s_out = sum(s_a, c);
    return [s_out, c_out];
}
function add(a, b) {
    var out = new Int8Array(Math.max(a.length, b.length));
    var carry = 0;
    var a_i;
    var b_i;
    for (var i = 0; i < out.length; i++) {
        a_i = i < a.length ? a[i] : 0;
        b_i = i < b.length ? b[i] : 0;
        var f_a = full_add(a_i, b_i, carry);
        out[i] = f_a[0];
        carry = f_a[1];
    }
    return out;
}
exports.add = add;
exports.increment = function (value) { return add(value, new Int8Array(1).fill(1)); };
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