110 lines
2.4 KiB
JavaScript
110 lines
2.4 KiB
JavaScript
// Sshwifty - A Web SSH client
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//
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// Copyright (C) 2019-2021 NI Rui <ranqus@gmail.com>
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as
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// published by the Free Software Foundation, either version 3 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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/**
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* Get one unsafe random number
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*
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* @param {number} min Min value (included)
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* @param {number} max Max value (not included)
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*
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* @returns {number} Get random number
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*
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*/
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export function getRand(min, max) {
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return Math.floor(Math.random() * (max - min + 1) + min);
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}
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/**
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* Get a group of random number
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*
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* @param {number} n How many number to get
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* @param {number} min Min value (included)
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* @param {number} max Max value (not included)
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*
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* @returns {Array<number>} A group of random number
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*/
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export function getRands(n, min, max) {
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let r = [];
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for (let i = 0; i < n; i++) {
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r.push(getRand(min, max));
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}
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return r;
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}
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/**
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* Separate given buffer to multiple ones based on input max length
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*
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* @param {Uint8Array} buf Buffer to separate
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* @param {number} max Max length of each buffer
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*
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* @returns {Array<Uint8Array>} Separated buffers
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*
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*/
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export function separateBuffer(buf, max) {
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let start = 0,
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result = [];
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while (start < buf.length) {
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let remain = buf.length - start;
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if (remain <= max) {
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result.push(buf.slice(start, start + remain));
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return result;
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}
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remain = max;
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result.push(buf.slice(start, start + remain));
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start += remain;
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}
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}
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/**
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* Create an Uint8Array out of given binary string
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*
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* @param {string} str binary string
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*
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* @returns {Uint8Array} Separated buffers
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*
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*/
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export function buildBufferFromString(str) {
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let r = [],
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t = [];
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for (let i in str) {
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let c = str.charCodeAt(i);
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while (c > 0xff) {
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t.push(c & 0xff);
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c >>= 8;
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}
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r.push(c);
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for (let j = t.length; j > 0; j--) {
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r.push(t[j]);
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}
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t = [];
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}
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return new Uint8Array(r);
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}
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