82 lines
2.1 KiB
JavaScript
82 lines
2.1 KiB
JavaScript
/*
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This file is part of ethereum.js.
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ethereum.js is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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ethereum.js 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 Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with ethereum.js. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** @file utils.js
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* @authors:
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* Marek Kotewicz <marek@ethdev.com>
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* @date 2015
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*/
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/// Finds first index of array element matching pattern
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/// @param array
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/// @param callback pattern
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/// @returns index of element
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var findIndex = function (array, callback) {
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var end = false;
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var i = 0;
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for (; i < array.length && !end; i++) {
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end = callback(array[i]);
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}
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return end ? i - 1 : -1;
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};
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/// @returns ascii string representation of hex value prefixed with 0x
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var toAscii = function(hex) {
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// Find termination
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var str = "";
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var i = 0, l = hex.length;
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if (hex.substring(0, 2) === '0x') {
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i = 2;
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}
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for (; i < l; i+=2) {
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var code = parseInt(hex.substr(i, 2), 16);
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if (code === 0) {
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break;
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}
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str += String.fromCharCode(code);
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}
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return str;
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};
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var toHex = function(str) {
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var hex = "";
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for(var i = 0; i < str.length; i++) {
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var n = str.charCodeAt(i).toString(16);
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hex += n.length < 2 ? '0' + n : n;
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}
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return hex;
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};
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/// @returns hex representation (prefixed by 0x) of ascii string
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var fromAscii = function(str, pad) {
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pad = pad === undefined ? 0 : pad;
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var hex = toHex(str);
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while (hex.length < pad*2)
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hex += "00";
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return "0x" + hex;
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};
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module.exports = {
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findIndex: findIndex,
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toAscii: toAscii,
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fromAscii: fromAscii
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};
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