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.
6 * Defines functions for translating between JavaScript strings and UTF8 strings
7 * stored in ArrayBuffers. There is much room for optimization in this code if
10 define("mojo/public/js/bindings/unicode", function() {
12 * Decodes the UTF8 string from the given buffer.
13 * @param {ArrayBufferView} buffer The buffer containing UTF8 string data.
14 * @return {string} The corresponding JavaScript string.
16 function decodeUtf8String(buffer) {
17 return decodeURIComponent(escape(String.fromCharCode.apply(null, buffer)));
21 * Encodes the given JavaScript string into UTF8.
22 * @param {string} str The string to encode.
23 * @param {ArrayBufferView} outputBuffer The buffer to contain the result.
24 * Should be pre-allocated to hold enough space. Use |utf8Length| to determine
25 * how much space is required.
26 * @return {number} The number of bytes written to |outputBuffer|.
28 function encodeUtf8String(str, outputBuffer) {
29 var utf8String = unescape(encodeURIComponent(str));
30 if (outputBuffer.length < utf8String.length)
31 throw new Error("Buffer too small for encodeUtf8String");
32 for (var i = 0; i < outputBuffer.length && i < utf8String.length; i++)
33 outputBuffer[i] = utf8String.charCodeAt(i);
38 * Returns the number of bytes that a UTF8 encoding of the JavaScript string
41 function utf8Length(str) {
42 var utf8String = unescape(encodeURIComponent(str));
43 return utf8String.length;
47 exports.decodeUtf8String = decodeUtf8String;
48 exports.encodeUtf8String = encodeUtf8String;
49 exports.utf8Length = utf8Length;