The Tor Browser: toolkit/modules/WindowsRegistry.jsm@b8a032363ba2

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     1 /* This Source Code Form is subject to the terms of the Mozilla Public

     2  * License, v. 2.0. If a copy of the MPL was not distributed with this

     3  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     5 "use strict";

     6 const {classes: Cc, interfaces: Ci, utils: Cu, results: Cr} = Components;

     8 this.EXPORTED_SYMBOLS = ["WindowsRegistry"];

    10 const WindowsRegistry = {

    11   /**

    12    * Safely reads a value from the registry.

    13    *

    14    * @param aRoot

    15    *        The root registry to use.

    16    * @param aPath

    17    *        The registry path to the key.

    18    * @param aKey

    19    *        The key name.

    20    * @return The key value or undefined if it doesn't exist.  If the key is

    21    *         a REG_MULTI_SZ, an array is returned.

    22    */

    23   readRegKey: function(aRoot, aPath, aKey) {

    24     const kRegMultiSz = 7;

    25     let registry = Cc["@mozilla.org/windows-registry-key;1"].

    26                    createInstance(Ci.nsIWindowsRegKey);

    27     try {

    28       registry.open(aRoot, aPath, Ci.nsIWindowsRegKey.ACCESS_READ);

    29       if (registry.hasValue(aKey)) {

    30         let type = registry.getValueType(aKey);

    31         switch (type) {

    32           case kRegMultiSz:

    33             // nsIWindowsRegKey doesn't support REG_MULTI_SZ type out of the box.

    34             let str = registry.readStringValue(aKey);

    35             return [v for each (v in str.split("\0")) if (v)];

    36           case Ci.nsIWindowsRegKey.TYPE_STRING:

    37             return registry.readStringValue(aKey);

    38           case Ci.nsIWindowsRegKey.TYPE_INT:

    39             return registry.readIntValue(aKey);

    40           default:

    41             throw new Error("Unsupported registry value.");

    42         }

    43       }

    44     } catch (ex) {

    45     } finally {

    46       registry.close();

    47     }

    48     return undefined;

    49   },

    50 };

The Tor Browser / file revision