diff -r 000000000000 -r 6474c204b198 xpcom/glue/nsID.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/xpcom/glue/nsID.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,140 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nsID_h__
+#define nsID_h__
+
+#include <string.h>
+
+#include "nscore.h"
+
+#define NSID_LENGTH 39
+
+/**
+ * A "unique identifier". This is modeled after OSF DCE UUIDs.
+ */
+
+struct nsID {
+  /**
+   * @name Identifier values
+   */
+
+  //@{
+  uint32_t m0;
+  uint16_t m1;
+  uint16_t m2;
+  uint8_t m3[8];
+  //@}
+
+  /**
+   * @name Methods
+   */
+
+  //@{
+  /**
+   * Equivalency method. Compares this nsID with another.
+   * @return <b>true</b> if they are the same, <b>false</b> if not.
+   */
+
+  inline bool Equals(const nsID& other) const {
+    // Unfortunately memcmp isn't faster than this.
+    return
+      ((((uint32_t*) &m0)[0] == ((uint32_t*) &other.m0)[0]) &&
+       (((uint32_t*) &m0)[1] == ((uint32_t*) &other.m0)[1]) &&
+       (((uint32_t*) &m0)[2] == ((uint32_t*) &other.m0)[2]) &&
+       (((uint32_t*) &m0)[3] == ((uint32_t*) &other.m0)[3]));
+  }
+
+  /**
+   * nsID Parsing method. Turns a {xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx}
+   * string into an nsID
+   */
+  NS_COM_GLUE bool Parse(const char *aIDStr);
+
+#ifndef XPCOM_GLUE_AVOID_NSPR
+  /**
+   * nsID string encoder. Returns an allocated string in 
+   * {xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx} format. Caller should free string.
+   * YOU SHOULD ONLY USE THIS IF YOU CANNOT USE ToProvidedString() BELOW.
+   */
+  NS_COM_GLUE char* ToString() const;
+
+  /**
+   * nsID string encoder. Builds a string in 
+   * {xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx} format, into a char[NSID_LENGTH]
+   * buffer provided by the caller (for instance, on the stack).
+   */
+  NS_COM_GLUE void ToProvidedString(char (&dest)[NSID_LENGTH]) const;
+
+#endif // XPCOM_GLUE_AVOID_NSPR
+
+  //@}
+};
+
+/*
+ * Class IDs
+ */
+
+typedef nsID nsCID;
+
+// Define an CID
+#define NS_DEFINE_CID(_name, _cidspec) \
+  const nsCID _name = _cidspec
+
+#define NS_DEFINE_NAMED_CID(_name) \
+  static nsCID k##_name = _name
+
+#define REFNSCID const nsCID&
+
+/**
+ * An "interface id" which can be used to uniquely identify a given
+ * interface.
+ */
+
+typedef nsID nsIID;
+
+/**
+ * A macro shorthand for <tt>const nsIID&<tt>
+ */
+
+#define REFNSIID const nsIID&
+
+/**
+ * Define an IID
+ * obsolete - do not use this macro
+ */
+ 
+#define NS_DEFINE_IID(_name, _iidspec) \
+  const nsIID _name = _iidspec
+
+/**
+ * A macro to build the static const IID accessor method. The Dummy
+ * template parameter only exists so that the kIID symbol will be linked
+ * properly (weak symbol on linux, gnu_linkonce on mac, multiple-definitions
+ * merged on windows). Dummy should always be instantiated as "int".
+ */
+
+#define NS_DECLARE_STATIC_IID_ACCESSOR(the_iid)                         \
+  template <class Dummy>                                                \
+  struct COMTypeInfo                                                    \
+  {                                                                     \
+    static const nsIID kIID NS_HIDDEN;                                  \
+  };
+
+#define NS_DEFINE_STATIC_IID_ACCESSOR(the_interface, the_iid)           \
+  template <class Dummy>                                                \
+  const nsIID the_interface::COMTypeInfo<Dummy>::kIID NS_HIDDEN = the_iid;
+
+/**
+ * A macro to build the static const CID accessor method
+ */
+
+#define NS_DEFINE_STATIC_CID_ACCESSOR(the_cid) \
+  static const nsID& GetCID() {static const nsID cid = the_cid; return cid;}
+
+#define NS_GET_IID(T) (T::COMTypeInfo<int>::kIID)
+#define NS_GET_TEMPLATE_IID(T) (T::template COMTypeInfo<int>::kIID)
+
+#endif