/* ***** BEGIN LICENSE BLOCK *****
 *   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
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is
 * the Mozilla Foundation.
 * Portions created by the Initial Developer are Copyright (C) 2009
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Siddharth Agarwal <sid.bugzilla@gmail.com>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

var EXPORTED_SYMBOLS = ["IOUtils"];

const Cc = Components.classes;
const Ci = Components.interfaces;

var IOUtils =
{
  /**
   * Read a file containing ASCII text into a string.
   *
   * @param aFile An nsIFile representing the file to read.
   * @returns A string containing the contents of the file, presumed to be ASCII
   *          text.
   */
  loadFileToString: function IOUtils_loadFileToString(aFile) {
    let fstream = Cc["@mozilla.org/network/file-input-stream;1"]
                    .createInstance(Ci.nsIFileInputStream);
    fstream.init(aFile, -1, 0, 0);

    let sstream = Cc["@mozilla.org/scriptableinputstream;1"]
                    .createInstance(Ci.nsIScriptableInputStream);
    sstream.init(fstream);

    let data = "";
    let str = sstream.read(4096);
    while (str.length > 0) {
      data += str;
      str = sstream.read(4096);
    }

    sstream.close();
    fstream.close();

    return data;
  },

  /**
   * This is provided by the JS component loader.
   */
  btoa: btoa,

  getPhysicalMemorySize: function IOUtils_getPhysicalMemorySize() {
    let systemInfo = Cc["@mozilla.org/system-info;1"]
                      .createInstance(Ci.nsIPropertyBag2);
    return systemInfo.getPropertyAsInt64("memsize");
  },
};
