gecko/content/base/test/unit/head_utilities.js

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
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 *
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 * for the specific language governing rights and limitations under the
 * License.
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 * The Original Code is Mozilla.org
 *
 * The Initial Developer of the Original Code is Disruptive Innovations.
 *
 * Portions created by the Initial Developer are Copyright (C) 2008
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Laurent Jouanneau <laurent.jouanneau@disruptive-innovations.com>, Original author
 *
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 * either the GNU General Public License Version 2 or later (the "GPL"), or
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const nsIDocumentEncoder = Components.interfaces.nsIDocumentEncoder;
const replacementChar = Components.interfaces.nsIConverterInputStream.DEFAULT_REPLACEMENT_CHARACTER;

function loadContentFile(aFile, aCharset) {
    //if(aAsIso == undefined) aAsIso = false;
    if(aCharset == undefined)
        aCharset = 'UTF-8';

    var file = do_get_file(aFile);
    var ios = Components.classes['@mozilla.org/network/io-service;1']
            .getService(Components.interfaces.nsIIOService);
    var chann = ios.newChannelFromURI ( ios.newFileURI (file) );
    chann.contentCharset = aCharset;

    /*var inputStream = Components.classes["@mozilla.org/scriptableinputstream;1"]
                        .createInstance(Components.interfaces.nsIScriptableInputStream);
    inputStream.init(chann.open());
    return inputStream.read(file.fileSize);
    */

    var inputStream = Components.classes["@mozilla.org/intl/converter-input-stream;1"]
                       .createInstance(Components.interfaces.nsIConverterInputStream);
    inputStream.init(chann.open(), aCharset, 1024, replacementChar);
    var str = {}, content = '';
    while (inputStream.readString(4096, str) != 0) {
        content += str.value;
    }
    return content;
}