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| 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. | |
| 4 | |
| 5 /** | |
| 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 | |
| 8 * it proves necessary. | |
| 9 */ | |
| 10 define("mojo/public/js/unicode", function() { | |
| 11 /** | |
| 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. | |
| 15 */ | |
| 16 function decodeUtf8String(buffer) { | |
| 17 return decodeURIComponent(escape(String.fromCharCode.apply(null, buffer))); | |
| 18 } | |
| 19 | |
| 20 /** | |
| 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|. | |
| 27 */ | |
| 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); | |
| 34 return i; | |
| 35 } | |
| 36 | |
| 37 /** | |
| 38 * Returns the number of bytes that a UTF8 encoding of the JavaScript string | |
| 39 * |str| would occupy. | |
| 40 */ | |
| 41 function utf8Length(str) { | |
| 42 var utf8String = unescape(encodeURIComponent(str)); | |
| 43 return utf8String.length; | |
| 44 } | |
| 45 | |
| 46 var exports = {}; | |
| 47 exports.decodeUtf8String = decodeUtf8String; | |
| 48 exports.encodeUtf8String = encodeUtf8String; | |
| 49 exports.utf8Length = utf8Length; | |
| 50 return exports; | |
| 51 }); | |
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