--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/chrome/MozillaFileLogger.js	Tue Oct 05 17:01:29 2010 -0400
@@ -0,0 +1,153 @@
+/**
+ * MozillaFileLogger, a log listener that can write to a local file.
+ */
+
+var ipcMode = false; // running in e10s build and need to use IPC?
+try {
+  netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
+  var ipcsanity = Components.classes["@mozilla.org/preferences-service;1"]
+                    .getService(Components.interfaces.nsIPrefBranch);
+  ipcsanity.setIntPref("mochitest.ipcmode", 0);
+} catch (e) {
+  ipcMode = true;
+}
+
+function contentDispatchEvent(type, data, sync) {
+  if (typeof(data) === "undefined") {
+    data = {};
+  }
+
+  var element = document.createEvent("datacontainerevent");
+  element.initEvent("contentEvent", true, false);
+  element.setData("sync", sync);
+  element.setData("type", type);
+  element.setData("data", JSON.stringify(data));
+  document.dispatchEvent(element);
+}
+
+function contentSyncEvent(type, data) {
+  contentDispatchEvent(type, data, 1);
+}
+
+function contentAsyncEvent(type, data) {
+  contentDispatchEvent(type, data, 0);
+}
+
+try {
+  netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
+
+  if (Cc === undefined) {
+    var Cc = Components.classes;
+    var Ci = Components.interfaces;
+  }
+} catch (ex) {} //running in ipcMode-chrome
+
+try {
+  const FOSTREAM_CID = "@mozilla.org/network/file-output-stream;1";
+  const LF_CID = "@mozilla.org/file/local;1";
+  
+  // File status flags. It is a bitwise OR of the following bit flags.
+  // Only one of the first three flags below may be used.
+  const PR_READ_ONLY    = 0x01; // Open for reading only.
+  const PR_WRITE_ONLY   = 0x02; // Open for writing only.
+  const PR_READ_WRITE   = 0x04; // Open for reading and writing.
+  
+  // If the file does not exist, the file is created.
+  // If the file exists, this flag has no effect.
+  const PR_CREATE_FILE  = 0x08;
+  
+  // The file pointer is set to the end of the file prior to each write.
+  const PR_APPEND       = 0x10;
+  
+  // If the file exists, its length is truncated to 0.
+  const PR_TRUNCATE     = 0x20;
+  
+  // If set, each write will wait for both the file data
+  // and file status to be physically updated.
+  const PR_SYNC         = 0x40;
+  
+  // If the file does not exist, the file is created. If the file already
+  // exists, no action and NULL is returned.
+  const PR_EXCL         = 0x80;
+} catch (ex) {
+ // probably not running in the test harness
+}
+
+/** Init the file logger with the absolute path to the file.
+    It will create and append if the file already exists **/
+var MozillaFileLogger = {};
+
+
+MozillaFileLogger.init = function(path) {
+  if (ipcMode) {
+    contentAsyncEvent("LoggerInit", {"filename": path});
+    return;
+  }
+
+  try {
+    netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
+  } catch (ex) {} //running in ipcMode-chrome
+
+  MozillaFileLogger._file = Cc[LF_CID].createInstance(Ci.nsILocalFile);
+  MozillaFileLogger._file.initWithPath(path);
+  MozillaFileLogger._foStream = Cc[FOSTREAM_CID].createInstance(Ci.nsIFileOutputStream);
+  MozillaFileLogger._foStream.init(this._file, PR_WRITE_ONLY | PR_CREATE_FILE | PR_APPEND,
+                                   0664, 0);
+}
+
+MozillaFileLogger.getLogCallback = function() {
+  if (ipcMode) {
+    return function(msg) {
+      contentAsyncEvent("Logger", {"num": msg.num, "level": msg.level, "info": msg.info.join(' ')});
+    }
+  }
+
+  return function (msg) {
+    try {
+      netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
+    } catch(ex) {} //running in ipcMode-chrome
+
+    var data = msg.num + " " + msg.level + " " + msg.info.join(' ') + "\n";
+    if (MozillaFileLogger._foStream)
+      MozillaFileLogger._foStream.write(data, data.length);
+
+    if (data.indexOf("SimpleTest FINISH") >= 0) {
+      MozillaFileLogger.close();
+    }
+  }
+}
+
+// This is only used from chrome space by the reftest harness
+MozillaFileLogger.log = function(msg) {
+  netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
+  if (MozillaFileLogger._foStream)
+    MozillaFileLogger._foStream.write(msg, msg.length);
+}
+
+MozillaFileLogger.close = function() {
+  if (ipcMode) {
+    contentAsyncEvent("LoggerClose");
+    return;
+  }
+
+  try {
+    netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
+  } catch(ex) {} //running in ipcMode-chrome
+
+  if(MozillaFileLogger._foStream)
+    MozillaFileLogger._foStream.close();
+  
+  MozillaFileLogger._foStream = null;
+  MozillaFileLogger._file = null;
+}
+
+if (ipcMode == false) {
+  try {
+    var prefs = Components.classes['@mozilla.org/preferences-service;1']
+      .getService(Components.interfaces.nsIPrefBranch2);
+    var filename = prefs.getCharPref('talos.logfile');
+    MozillaFileLogger.init(filename);
+  } catch (ex) {} //pref does not exist, return empty string
+}
+
+