Timo Hocker
2e9c3896a5
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101 lines
2.1 KiB
JavaScript
101 lines
2.1 KiB
JavaScript
/*
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* Copyright (C) Sapphirecode - All Rights Reserved
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* This file is part of encoding-helper which is released under MIT.
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* See file 'LICENSE' for full license details.
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* Created by Timo Hocker <timo@scode.ovh>, May 2020
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*/
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/* eslint-disable no-magic-numbers */
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'use strict';
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const b58 = require ('b58');
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function get_buffer (str, encoding) {
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if (encoding === 'base58')
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return b58.decode (str);
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return Buffer.from (str, encoding);
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}
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/**
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* encode a string to base64
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*
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* @param {string} str string to encode
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* @param {string} encoding encoding the string is in
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* @returns {string} base64
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*/
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function to_b64 (str, encoding = '') {
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const buf = get_buffer (str, encoding);
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return buf.toString ('base64');
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}
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/**
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* encode a string to base58
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*
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* @param {string} str string to encode
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* @param {string} encoding encoding the string is in
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* @returns {string} base58
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*/
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function to_b58 (str, encoding = '') {
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const buf = get_buffer (str, encoding);
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return b58.encode (buf);
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}
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/**
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* encode a string to utf-8
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*
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* @param {string} str string to encode
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* @param {string} encoding encoding the string is in
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* @returns {string} utf-8
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*/
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function to_utf8 (str, encoding) {
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const buf = get_buffer (str, encoding);
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return buf.toString ('utf-8');
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}
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/**
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* encode a string to hex
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*
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* @param {string} str string to encode
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* @param {string} encoding encoding the string is in
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* @returns {string} hex
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*/
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function to_hex (str, encoding = '') {
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const buf = get_buffer (str, encoding);
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return buf.toString ('hex');
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}
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/**
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* encode a number to hex
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*
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* @param {number} n number to encode
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* @param {number} padding minumum length of output
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* @returns {string} hex
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*/
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function num_to_hex (n, padding = 0) {
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const res = n.toString (16);
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if (res.length < padding)
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return '0'.repeat (padding - res.length) + res;
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return res;
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}
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/**
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* decode a number from hex
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*
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* @param {string} h hex to decode
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* @returns {number} number
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*/
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function hex_to_num (h) {
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return parseInt (h, 16);
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}
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module.exports = {
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to_b64,
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to_b58,
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to_hex,
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to_utf8,
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num_to_hex,
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hex_to_num
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};
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