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/* -*- Mode: javascript; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** 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 Firetray
*
* The Initial Developer of the Original Code is
* Mozilla Messaging, Ltd.
* Portions created by the Initial Developer are Copyright (C) 2011
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Chris Coulson <chris.coulson@canonical.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 ***** */
const Cu = Components.utils;
Cu.import("resource://gre/modules/ctypes.jsm");
Cu.import("resource://gre/modules/XPCOMUtils.jsm");
Cu.import("chrome://topmenu/content/log4moz.js");
var EXPORTED_SYMBOLS = [ "ctypes_library" ];
let log = Log4Moz.repository.getLogger("topmenu.ctypes-utils");
/**
* Loads a library using ctypes and exports an object on to the specified
* global object. The name of the exported object will be the first name
* specified in the global objects EXPORTED_SYMBOLS list.
*
* It is an error to call this function more than once in a JS module. This
* implies that you should have one JS module per ctypes library.
*
* In addition to native types and functions, the exported object will contain
* some additional utility functions:
*
* close Close the library and unload the JS module
* available Returns true if the library is available, false otherwise
* ABI A property containing the library ABI loaded (or -1 if unavailable)
*
* @param aName
* The name of the library to load, without the "lib" prefix or any
* file extension.
*
* @param aABIs
* An array of library ABI's to search for. The first one found will
* be loaded and the loaded ABI will be saved on the exported object.
*
* @param aDefines
* A function which will be called to load library symbols and create
* types. The function will be called with one parameter, which contains
* several functions for binding symbols. The "this" object will be
* the exported object, on to which you can should types and symbols.
*
* @param aGlobal
* The global object on to which we export an object. This must be a
* a valid JSM global object.
*
*/
function ctypes_library(aName, aABIs, aDefines, aGlobal) {
try {
log.debug("Trying to load library: " + aName);
if (typeof(aName) != "string") {
throw Error("Invalid library name");
}
if (!aABIs || typeof(aABIs) != "object") {
throw Error("Invalid range of library ABI's");
}
if (typeof(aDefines) != "function") {
throw Error("Invalid defines function");
}
if (!aGlobal || typeof(aGlobal) != "object" || !aGlobal.EXPORTED_SYMBOLS ||
typeof(aGlobal.EXPORTED_SYMBOLS) != "object") {
throw Error("Must specify a valid global object from a loaded JS module");
}
if (!("__URI__" in aGlobal) || !aGlobal.__URI__) {
throw Error("This JS module has already been unloaded");
}
if (aGlobal[aGlobal.EXPORTED_SYMBOLS[0]]) {
throw Error("Was ctypes_library() called more than once for this module?");
}
var library;
for each (let abi in aABIs) {
let soname = "lib" + aName + ".so." + abi.toString();
log.debug("Trying " + soname);
try {
library = ctypes.open(soname);
this.ABI = abi;
log.debug("Successfully loaded " + soname);
break;
} catch(e) {
log.error(soname+" unfound.");
}
}
this.name = aName;
this.close = function() {
log.debug("Closing library " + aName);
library.close();
this.ABI = -1;
if (!("__URI__" in aGlobal) || !aGlobal.__URI__) {
// We could have already been unloaded by now
return;
}
log.debug("Unloading JS module " + aGlobal.__URI__);
Cu.unload(aGlobal.__URI__);
};
this.available = function() {
return this.ABI != -1;
};
if (!library) {
log.debug("Failed to load library: " + aName);
this.ABI = -1;
return;
}
var self = this;
let lib = {
declare: function() {
try {
args = [];
args.push(arguments[0]);
args.push(ctypes.default_abi);
for each (let arg in Array.prototype.slice.call(arguments, 1)) {
args.push(arg);
}
return library.declare.apply(library, args);
} catch (ex) {
Cu.reportError(ex);
log.error("Missing symbol " + arguments[0] + " in library " + aName);
self.ABI = -1;
return null;
}
},
lazy_bind: function() {
var args = Array.prototype.slice.call(arguments, 0);
XPCOMUtils.defineLazyGetter(self, arguments[0], function() {
return lib.declare.apply(lib, args);
});
},
bind_now: function() {
self[arguments[0]] = this.declare.apply(this, arguments);
}
};
aDefines.call(this, lib);
aGlobal[aGlobal.EXPORTED_SYMBOLS[0]] = this;
} catch(e) {
Cu.reportError(e);
log.error(aName+" definition error: "+e);
this.ABI = -1;
}
}
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