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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
/**
* Defines functions for translating between JavaScript strings and UTF8 strings
* stored in ArrayBuffers. There is much room for optimization in this code if
* it proves necessary.
*/
(function() {
var internal = mojo.internal;
/**
* Decodes the UTF8 string from the given buffer.
* @param {ArrayBufferView} buffer The buffer containing UTF8 string data.
* @return {string} The corresponding JavaScript string.
*/
function decodeUtf8String(buffer) {
return decodeURIComponent(escape(String.fromCharCode.apply(null, buffer)));
}
/**
* Encodes the given JavaScript string into UTF8.
* @param {string} str The string to encode.
* @param {ArrayBufferView} outputBuffer The buffer to contain the result.
* Should be pre-allocated to hold enough space. Use |utf8Length| to determine
* how much space is required.
* @return {number} The number of bytes written to |outputBuffer|.
*/
function encodeUtf8String(str, outputBuffer) {
var utf8String = unescape(encodeURIComponent(str));
if (outputBuffer.length < utf8String.length)
throw new Error("Buffer too small for encodeUtf8String");
for (var i = 0; i < outputBuffer.length && i < utf8String.length; i++)
outputBuffer[i] = utf8String.charCodeAt(i);
return i;
}
/**
* Returns the number of bytes that a UTF8 encoding of the JavaScript string
* |str| would occupy.
*/
function utf8Length(str) {
var utf8String = unescape(encodeURIComponent(str));
return utf8String.length;
}
internal.decodeUtf8String = decodeUtf8String;
internal.encodeUtf8String = encodeUtf8String;
internal.utf8Length = utf8Length;
})();
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