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diff --git a/tools/addon-sdk-1.4/packages/api-utils/lib/file.js b/tools/addon-sdk-1.4/packages/api-utils/lib/file.js
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+/* ***** 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 nsINarwhal.
+ *
+ * The Initial Developer of the Original Code is
+ * Irakli Gozalishvili <rfobic@gmail.com>.
+ * Portions created by the Initial Developer are Copyright (C) 2009
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Irakli Gozalishvili <rfobic@gmail.com>
+ *   Atul Varma <atul@mozilla.com>
+ *   Drew Willcoxon <adw@mozilla.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 ***** */
+
+"use strict";
+
+const {Cc,Ci,Cr} = require("chrome");
+const byteStreams = require("./byte-streams");
+const textStreams = require("./text-streams");
+
+// Flags passed when opening a file.  See nsprpub/pr/include/prio.h.
+const OPEN_FLAGS = {
+  RDONLY: parseInt("0x01"),
+  WRONLY: parseInt("0x02"),
+  CREATE_FILE: parseInt("0x08"),
+  APPEND: parseInt("0x10"),
+  TRUNCATE: parseInt("0x20"),
+  EXCL: parseInt("0x80")
+};
+
+var dirsvc = Cc["@mozilla.org/file/directory_service;1"]
+             .getService(Ci.nsIProperties);
+
+function MozFile(path) {
+  var file = Cc['@mozilla.org/file/local;1']
+             .createInstance(Ci.nsILocalFile);
+  file.initWithPath(path);
+  return file;
+}
+
+function ensureReadable(file) {
+  if (!file.isReadable())
+    throw new Error("path is not readable: " + file.path);
+}
+
+function ensureDir(file) {
+  ensureExists(file);
+  if (!file.isDirectory())
+    throw new Error("path is not a directory: " + file.path);
+}
+
+function ensureFile(file) {
+  ensureExists(file);
+  if (!file.isFile())
+    throw new Error("path is not a file: " + file.path);
+}
+
+function ensureExists(file) {
+  if (!file.exists())
+    throw friendlyError(Cr.NS_ERROR_FILE_NOT_FOUND, file.path);
+}
+
+function friendlyError(errOrResult, filename) {
+  var isResult = typeof(errOrResult) === "number";
+  var result = isResult ? errOrResult : errOrResult.result;
+  switch (result) {
+  case Cr.NS_ERROR_FILE_NOT_FOUND:
+    return new Error("path does not exist: " + filename);
+  }
+  return isResult ? new Error("XPCOM error code: " + errOrResult) : errOrResult;
+}
+
+exports.exists = function exists(filename) {
+  return MozFile(filename).exists();
+};
+
+exports.isFile = function isFile(filename) {
+  return MozFile(filename).isFile();
+};
+
+exports.read = function read(filename, mode) {
+  if (typeof(mode) !== "string")
+    mode = "";
+
+  // Ensure mode is read-only.
+  mode = /b/.test(mode) ? "b" : "";
+
+  var stream = exports.open(filename, mode);
+  try {
+    var str = stream.read();
+  }
+  finally {
+    stream.close();
+  }
+
+  return str;
+};
+
+exports.join = function join(base) {
+  if (arguments.length < 2)
+    throw new Error("need at least 2 args");
+  base = MozFile(base);
+  for (var i = 1; i < arguments.length; i++)
+    base.append(arguments[i]);
+  return base.path;
+};
+
+exports.dirname = function dirname(path) {
+  var parent = MozFile(path).parent;
+  return parent ? parent.path : "";
+};
+
+exports.basename = function basename(path) {
+  var leafName = MozFile(path).leafName;
+
+  // On Windows, leafName when the path is a volume letter and colon ("c:") is
+  // the path itself.  But such a path has no basename, so we want the empty
+  // string.
+  return leafName == path ? "" : leafName;
+};
+
+exports.list = function list(path) {
+  var file = MozFile(path);
+  ensureDir(file);
+  ensureReadable(file);
+
+  var entries = file.directoryEntries;
+  var entryNames = [];
+  while(entries.hasMoreElements()) {
+    var entry = entries.getNext();
+    entry.QueryInterface(Ci.nsIFile);
+    entryNames.push(entry.leafName);
+  }
+  return entryNames;
+};
+
+exports.open = function open(filename, mode) {
+  var file = MozFile(filename);
+  if (typeof(mode) !== "string")
+    mode = "";
+
+  // File opened for write only.
+  if (/w/.test(mode)) {
+    if (file.exists())
+      ensureFile(file);
+    var stream = Cc['@mozilla.org/network/file-output-stream;1'].
+                 createInstance(Ci.nsIFileOutputStream);
+    var openFlags = OPEN_FLAGS.WRONLY |
+                    OPEN_FLAGS.CREATE_FILE |
+                    OPEN_FLAGS.TRUNCATE;
+    var permFlags = parseInt("0644"); // u+rw go+r
+    try {
+      stream.init(file, openFlags, permFlags, 0);
+    }
+    catch (err) {
+      throw friendlyError(err, filename);
+    }
+    return /b/.test(mode) ?
+           new byteStreams.ByteWriter(stream) :
+           new textStreams.TextWriter(stream);
+  }
+
+  // File opened for read only, the default.
+  ensureFile(file);
+  stream = Cc['@mozilla.org/network/file-input-stream;1'].
+           createInstance(Ci.nsIFileInputStream);
+  try {
+    stream.init(file, OPEN_FLAGS.RDONLY, 0, 0);
+  }
+  catch (err) {
+    throw friendlyError(err, filename);
+  }
+  return /b/.test(mode) ?
+         new byteStreams.ByteReader(stream) :
+         new textStreams.TextReader(stream);
+};
+
+exports.remove = function remove(path) {
+  var file = MozFile(path);
+  ensureFile(file);
+  file.remove(false);
+};
+
+exports.mkpath = function mkpath(path) {
+  var file = MozFile(path);
+  if (!file.exists())
+    file.create(Ci.nsIFile.DIRECTORY_TYPE, parseInt("0755")); // u+rwx go+rx
+  else if (!file.isDirectory())
+    throw new Error("The path already exists and is not a directory: " + path);
+};
+
+exports.rmdir = function rmdir(path) {
+  var file = MozFile(path);
+  ensureDir(file);
+  try {
+    file.remove(false);
+  }
+  catch (err) {
+    // Bug 566950 explains why we're not catching a specific exception here.
+    throw new Error("The directory is not empty: " + path);
+  }
+};