1 // Copyright 2014 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 /** @fileoverview Various string utility functions */
9 * Converts a string to an array of bytes.
10 * @param {string} s The string to convert.
11 * @param {(Array|Uint8Array)=} bytes The Array-like object into which to store
12 * the bytes. A new Array will be created if not provided.
13 * @return {(Array|Uint8Array)} An array of bytes representing the string.
15 function UTIL_StringToBytes(s, bytes) {
16 bytes = bytes || new Array(s.length);
17 for (var i = 0; i < s.length; ++i)
18 bytes[i] = s.charCodeAt(i);
22 function UTIL_BytesToString(b) {
23 return String.fromCharCode.apply(null, b);
26 function UTIL_BytesToHex(b) {
27 if (!b) return '(null)';
28 var hexchars = '0123456789ABCDEF';
29 var hexrep = new Array(b.length * 2);
31 for (var i = 0; i < b.length; ++i) {
32 hexrep[i * 2 + 0] = hexchars.charAt((b[i] >> 4) & 15);
33 hexrep[i * 2 + 1] = hexchars.charAt(b[i] & 15);
35 return hexrep.join('');
38 function UTIL_BytesToHexWithSeparator(b, sep) {
39 var hexchars = '0123456789ABCDEF';
40 var stride = 2 + (sep ? 1 : 0);
41 var hexrep = new Array(b.length * stride);
43 for (var i = 0; i < b.length; ++i) {
44 if (sep) hexrep[i * stride + 0] = sep;
45 hexrep[i * stride + stride - 2] = hexchars.charAt((b[i] >> 4) & 15);
46 hexrep[i * stride + stride - 1] = hexchars.charAt(b[i] & 15);
48 return (sep ? hexrep.slice(1) : hexrep).join('');
51 function UTIL_HexToBytes(h) {
52 var hexchars = '0123456789ABCDEFabcdef';
53 var res = new Uint8Array(h.length / 2);
54 for (var i = 0; i < h.length; i += 2) {
55 if (hexchars.indexOf(h.substring(i, i + 1)) == -1) break;
56 res[i / 2] = parseInt(h.substring(i, i + 2), 16);
61 function UTIL_equalArrays(a, b) {
62 if (!a || !b) return false;
63 if (a.length != b.length) return false;
65 for (var i = 0; i < a.length; ++i)
70 function UTIL_ltArrays(a, b) {
71 if (a.length < b.length) return true;
72 if (a.length > b.length) return false;
73 for (var i = 0; i < a.length; ++i) {
74 if (a[i] < b[i]) return true;
75 if (a[i] > b[i]) return false;
80 function UTIL_gtArrays(a, b) {
81 return UTIL_ltArrays(b, a);
84 function UTIL_geArrays(a, b) {
85 return !UTIL_ltArrays(a, b);
88 function UTIL_unionArrays(a, b) {
90 for (var i = 0; i < a.length; i++) {
93 for (var i = 0; i < b.length; i++) {
103 function UTIL_getRandom(a) {
104 var tmp = new Array(a);
105 var rnd = new Uint8Array(a);
106 window.crypto.getRandomValues(rnd); // Yay!
107 for (var i = 0; i < a; ++i) tmp[i] = rnd[i] & 255;
111 function UTIL_setFavicon(icon) {
112 // Construct a new favion link tag
113 var faviconLink = document.createElement('link');
114 faviconLink.rel = 'Shortcut Icon';
115 faviconLink.type = 'image/x-icon';
116 faviconLink.href = icon;
118 // Remove the old favion, if it exists
119 var head = document.getElementsByTagName('head')[0];
120 var links = head.getElementsByTagName('link');
121 for (var i = 0; i < links.length; i++) {
123 if (link.type == faviconLink.type && link.rel == faviconLink.rel) {
124 head.removeChild(link);
128 // Add in the new one
129 head.appendChild(faviconLink);
132 // Erase all entries in array
133 function UTIL_clear(a) {
134 if (a instanceof Array) {
135 for (var i = 0; i < a.length; ++i)
140 // hr:min:sec.milli string
141 function UTIL_time() {
143 var m = '000' + d.getMilliseconds();
144 var s = d.toTimeString().substring(0, 8) + '.' + m.substring(m.length - 3);
147 var UTIL_events = [];
148 var UTIL_max_events = 500;
150 function UTIL_fmt(s) {
151 var line = UTIL_time() + ' ' + s;
152 if (UTIL_events.push(line) > UTIL_max_events) {
154 UTIL_events.splice(0, UTIL_events.length - UTIL_max_events);