online update tdf#68274: fix --enable-online-update=mar on Windows

Change-Id: I397566ae2488799399cad361b24a281d3599cc5b

6 files changed, 2184 insertions, 0 deletions

diff --git a/onlineupdate/source/update/inc/mozilla/Char16.h b/onlineupdate/source/update/inc/mozilla/Char16.h
new file mode 100644
index 000000000000..f07494f7f47f
--- /dev/null
+++ b/onlineupdate/source/update/inc/mozilla/Char16.h
@@ -0,0 +1,239 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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/. */
+
+/* Implements a UTF-16 character type. */
+
+#ifndef mozilla_Char16_h
+#define mozilla_Char16_h
+
+#ifdef __cplusplus
+
+/*
+ * C++11 introduces a char16_t type and support for UTF-16 string and character
+ * literals. C++11's char16_t is a distinct builtin type. Technically, char16_t
+ * is a 16-bit code unit of a Unicode code point, not a "character".
+ */
+
+#if defined(_MSC_VER) && _MSC_VER < 1900
+   /*
+    * C++11 says char16_t is a distinct builtin type, but Windows's yvals.h
+    * typedefs char16_t as an unsigned short prior to MSVC 2015, which
+    * implemented C++11's distinct char16_t type. We would like to alias
+    * char16_t to Windows's 16-bit wchar_t so we can declare UTF-16 literals as
+    * constant expressions (and pass char16_t pointers to Windows APIs). We
+    * #define _CHAR16T here in order to prevent yvals.h from overriding our
+    * char16_t typedefs, which we set to wchar_t for C++ code.
+    *
+    * In addition, #defining _CHAR16T will prevent yvals.h from defining a
+    * char32_t type, so we have to undo that damage here and provide our own,
+    * which is identical to the yvals.h type.
+    */
+#  define MOZ_UTF16_HELPER(s) L##s
+#  define _CHAR16T
+typedef wchar_t char16_t;
+typedef unsigned int char32_t;
+#else
+   /* C++11 has a builtin char16_t type. */
+#  define MOZ_UTF16_HELPER(s) u##s
+   /**
+    * This macro is used to distinguish when char16_t would be a distinct
+    * typedef from wchar_t.
+    */
+#  define MOZ_CHAR16_IS_NOT_WCHAR
+#  ifdef WIN32
+#    define MOZ_USE_CHAR16_WRAPPER
+#  endif
+#endif
+
+#ifdef MOZ_USE_CHAR16_WRAPPER
+# include <string>
+  /**
+   * Win32 API extensively uses wchar_t, which is represented by a separated
+   * builtin type than char16_t per spec. It's not the case for MSVC prior to
+   * MSVC 2015, but other compilers follow the spec. We want to mix wchar_t and
+   * char16_t on Windows builds. This class is supposed to make it easier. It
+   * stores char16_t const pointer, but provides implicit casts for wchar_t as
+   * well. On other platforms, we simply use
+   * |typedef const char16_t* char16ptr_t|. Here, we want to make the class as
+   * similar to this typedef, including providing some casts that are allowed
+   * by the typedef.
+   */
+class char16ptr_t
+{
+private:
+  const char16_t* mPtr;
+  static_assert(sizeof(char16_t) == sizeof(wchar_t),
+                "char16_t and wchar_t sizes differ");
+
+public:
+  char16ptr_t(const char16_t* aPtr) : mPtr(aPtr) {}
+  char16ptr_t(const wchar_t* aPtr) :
+    mPtr(reinterpret_cast<const char16_t*>(aPtr))
+  {}
+
+  /* Without this, nullptr assignment would be ambiguous. */
+  constexpr char16ptr_t(decltype(nullptr)) : mPtr(nullptr) {}
+
+  operator const char16_t*() const
+  {
+    return mPtr;
+  }
+  operator const wchar_t*() const
+  {
+    return reinterpret_cast<const wchar_t*>(mPtr);
+  }
+  operator const void*() const
+  {
+    return mPtr;
+  }
+  operator bool() const
+  {
+    return mPtr != nullptr;
+  }
+  operator std::wstring() const
+  {
+    return std::wstring(static_cast<const wchar_t*>(*this));
+  }
+
+  /* Explicit cast operators to allow things like (char16_t*)str. */
+  explicit operator char16_t*() const
+  {
+    return const_cast<char16_t*>(mPtr);
+  }
+  explicit operator wchar_t*() const
+  {
+    return const_cast<wchar_t*>(static_cast<const wchar_t*>(*this));
+  }
+  explicit operator int() const
+  {
+    return reinterpret_cast<intptr_t>(mPtr);
+  }
+  explicit operator unsigned int() const
+  {
+    return reinterpret_cast<uintptr_t>(mPtr);
+  }
+  explicit operator long() const
+  {
+    return reinterpret_cast<intptr_t>(mPtr);
+  }
+  explicit operator unsigned long() const
+  {
+    return reinterpret_cast<uintptr_t>(mPtr);
+  }
+  explicit operator long long() const
+  {
+    return reinterpret_cast<intptr_t>(mPtr);
+  }
+  explicit operator unsigned long long() const
+  {
+    return reinterpret_cast<uintptr_t>(mPtr);
+  }
+
+  /**
+   * Some Windows API calls accept BYTE* but require that data actually be
+   * WCHAR*.  Supporting this requires explicit operators to support the
+   * requisite explicit casts.
+   */
+  explicit operator const char*() const
+  {
+    return reinterpret_cast<const char*>(mPtr);
+  }
+  explicit operator const unsigned char*() const
+  {
+    return reinterpret_cast<const unsigned char*>(mPtr);
+  }
+  explicit operator unsigned char*() const
+  {
+    return
+      const_cast<unsigned char*>(reinterpret_cast<const unsigned char*>(mPtr));
+  }
+  explicit operator void*() const
+  {
+    return const_cast<char16_t*>(mPtr);
+  }
+
+  /* Some operators used on pointers. */
+  char16_t operator[](size_t aIndex) const
+  {
+    return mPtr[aIndex];
+  }
+  bool operator==(const char16ptr_t& aOther) const
+  {
+    return mPtr == aOther.mPtr;
+  }
+  bool operator==(decltype(nullptr)) const
+  {
+    return mPtr == nullptr;
+  }
+  bool operator!=(const char16ptr_t& aOther) const
+  {
+    return mPtr != aOther.mPtr;
+  }
+  bool operator!=(decltype(nullptr)) const
+  {
+    return mPtr != nullptr;
+  }
+  char16ptr_t operator+(int aValue) const
+  {
+    return char16ptr_t(mPtr + aValue);
+  }
+  char16ptr_t operator+(unsigned int aValue) const
+  {
+    return char16ptr_t(mPtr + aValue);
+  }
+  char16ptr_t operator+(long aValue) const
+  {
+    return char16ptr_t(mPtr + aValue);
+  }
+  char16ptr_t operator+(unsigned long aValue) const
+  {
+    return char16ptr_t(mPtr + aValue);
+  }
+  char16ptr_t operator+(long long aValue) const
+  {
+    return char16ptr_t(mPtr + aValue);
+  }
+  char16ptr_t operator+(unsigned long long aValue) const
+  {
+    return char16ptr_t(mPtr + aValue);
+  }
+  ptrdiff_t operator-(const char16ptr_t& aOther) const
+  {
+    return mPtr - aOther.mPtr;
+  }
+};
+
+inline decltype((char*)0-(char*)0)
+operator-(const char16_t* aX, const char16ptr_t aY)
+{
+  return aX - static_cast<const char16_t*>(aY);
+}
+
+#else
+
+typedef const char16_t* char16ptr_t;
+
+#endif
+
+/*
+ * Macro arguments used in concatenation or stringification won't be expanded.
+ * Therefore, in order for |MOZ_UTF16(FOO)| to work as expected (which is to
+ * expand |FOO| before doing whatever |MOZ_UTF16| needs to do to it) a helper
+ * macro, |MOZ_UTF16_HELPER| needs to be inserted in between to allow the macro
+ * argument to expand. See "3.10.6 Separate Expansion of Macro Arguments" of the
+ * CPP manual for a more accurate and precise explanation.
+ */
+#define MOZ_UTF16(s) MOZ_UTF16_HELPER(s)
+
+static_assert(sizeof(char16_t) == 2, "Is char16_t type 16 bits?");
+static_assert(char16_t(-1) > char16_t(0), "Is char16_t type unsigned?");
+static_assert(sizeof(MOZ_UTF16('A')) == 2, "Is char literal 16 bits?");
+static_assert(sizeof(MOZ_UTF16("")[0]) == 2, "Is string char 16 bits?");
+
+#endif
+
+#endif /* mozilla_Char16_h */
+
diff --git a/onlineupdate/source/update/inc/mozilla/Move.h b/onlineupdate/source/update/inc/mozilla/Move.h
new file mode 100644
index 000000000000..f6d0bfc1ca38
--- /dev/null
+++ b/onlineupdate/source/update/inc/mozilla/Move.h
@@ -0,0 +1,238 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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/. */
+
+/* C++11-style, but C++98-usable, "move references" implementation. */
+
+#ifndef mozilla_Move_h
+#define mozilla_Move_h
+
+#include "mozilla/TypeTraits.h"
+
+namespace mozilla {
+
+/*
+ * "Move" References
+ *
+ * Some types can be copied much more efficiently if we know the original's
+ * value need not be preserved --- that is, if we are doing a "move", not a
+ * "copy". For example, if we have:
+ *
+ *   Vector<T> u;
+ *   Vector<T> v(u);
+ *
+ * the constructor for v must apply a copy constructor to each element of u ---
+ * taking time linear in the length of u. However, if we know we will not need u
+ * any more once v has been initialized, then we could initialize v very
+ * efficiently simply by stealing u's dynamically allocated buffer and giving it
+ * to v --- a constant-time operation, regardless of the size of u.
+ *
+ * Moves often appear in container implementations. For example, when we append
+ * to a vector, we may need to resize its buffer. This entails moving each of
+ * its extant elements from the old, smaller buffer to the new, larger buffer.
+ * But once the elements have been migrated, we're just going to throw away the
+ * old buffer; we don't care if they still have their values. So if the vector's
+ * element type can implement "move" more efficiently than "copy", the vector
+ * resizing should by all means use a "move" operation. Hash tables should also
+ * use moves when resizing their internal array as entries are added and
+ * removed.
+ *
+ * The details of the optimization, and whether it's worth applying, vary
+ * from one type to the next: copying an 'int' is as cheap as moving it, so
+ * there's no benefit in distinguishing 'int' moves from copies. And while
+ * some constructor calls for complex types are moves, many really have to
+ * be copies, and can't be optimized this way. So we need:
+ *
+ * 1) a way for a type (like Vector) to announce that it can be moved more
+ *    efficiently than it can be copied, and provide an implementation of that
+ *    move operation; and
+ *
+ * 2) a way for a particular invocation of a copy constructor to say that it's
+ *    really a move, not a copy, and that the value of the original isn't
+ *    important afterwards (although it must still be safe to destroy).
+ *
+ * If a constructor has a single argument of type 'T&&' (an 'rvalue reference
+ * to T'), that indicates that it is a 'move constructor'. That's 1). It should
+ * move, not copy, its argument into the object being constructed. It may leave
+ * the original in any safely-destructible state.
+ *
+ * If a constructor's argument is an rvalue, as in 'C(f(x))' or 'C(x + y)', as
+ * opposed to an lvalue, as in 'C(x)', then overload resolution will prefer the
+ * move constructor, if there is one. The 'mozilla::Move' function, defined in
+ * this file, is an identity function you can use in a constructor invocation to
+ * make any argument into an rvalue, like this: C(Move(x)). That's 2). (You
+ * could use any function that works, but 'Move' indicates your intention
+ * clearly.)
+ *
+ * Where we might define a copy constructor for a class C like this:
+ *
+ *   C(const C& rhs) { ... copy rhs to this ... }
+ *
+ * we would declare a move constructor like this:
+ *
+ *   C(C&& rhs) { .. move rhs to this ... }
+ *
+ * And where we might perform a copy like this:
+ *
+ *   C c2(c1);
+ *
+ * we would perform a move like this:
+ *
+ *   C c2(Move(c1));
+ *
+ * Note that 'T&&' implicitly converts to 'T&'. So you can pass a 'T&&' to an
+ * ordinary copy constructor for a type that doesn't support a special move
+ * constructor, and you'll just get a copy. This means that templates can use
+ * Move whenever they know they won't use the original value any more, even if
+ * they're not sure whether the type at hand has a specialized move constructor.
+ * If it doesn't, the 'T&&' will just convert to a 'T&', and the ordinary copy
+ * constructor will apply.
+ *
+ * A class with a move constructor can also provide a move assignment operator.
+ * A generic definition would run this's destructor, and then apply the move
+ * constructor to *this's memory. A typical definition:
+ *
+ *   C& operator=(C&& rhs) {
+ *     MOZ_ASSERT(&rhs != this, "self-moves are prohibited");
+ *     this->~C();
+ *     new(this) C(Move(rhs));
+ *     return *this;
+ *   }
+ *
+ * With that in place, one can write move assignments like this:
+ *
+ *   c2 = Move(c1);
+ *
+ * This destroys c2, moves c1's value to c2, and leaves c1 in an undefined but
+ * destructible state.
+ *
+ * As we say, a move must leave the original in a "destructible" state. The
+ * original's destructor will still be called, so if a move doesn't
+ * actually steal all its resources, that's fine. We require only that the
+ * move destination must take on the original's value; and that destructing
+ * the original must not break the move destination.
+ *
+ * (Opinions differ on whether move assignment operators should deal with move
+ * assignment of an object onto itself. It seems wise to either handle that
+ * case, or assert that it does not occur.)
+ *
+ * Forwarding:
+ *
+ * Sometimes we want copy construction or assignment if we're passed an ordinary
+ * value, but move construction if passed an rvalue reference. For example, if
+ * our constructor takes two arguments and either could usefully be a move, it
+ * seems silly to write out all four combinations:
+ *
+ *   C::C(X&  x, Y&  y) : x(x),       y(y)       { }
+ *   C::C(X&  x, Y&& y) : x(x),       y(Move(y)) { }
+ *   C::C(X&& x, Y&  y) : x(Move(x)), y(y)       { }
+ *   C::C(X&& x, Y&& y) : x(Move(x)), y(Move(y)) { }
+ *
+ * To avoid this, C++11 has tweaks to make it possible to write what you mean.
+ * The four constructor overloads above can be written as one constructor
+ * template like so[0]:
+ *
+ *   template <typename XArg, typename YArg>
+ *   C::C(XArg&& x, YArg&& y) : x(Forward<XArg>(x)), y(Forward<YArg>(y)) { }
+ *
+ * ("'Don't Repeat Yourself'? What's that?")
+ *
+ * This takes advantage of two new rules in C++11:
+ *
+ * - First, when a function template takes an argument that is an rvalue
+ *   reference to a template argument (like 'XArg&& x' and 'YArg&& y' above),
+ *   then when the argument is applied to an lvalue, the template argument
+ *   resolves to 'T&'; and when it is applied to an rvalue, the template
+ *   argument resolves to 'T'. Thus, in a call to C::C like:
+ *
+ *      X foo(int);
+ *      Y yy;
+ *
+ *      C(foo(5), yy)
+ *
+ *   XArg would resolve to 'X', and YArg would resolve to 'Y&'.
+ *
+ * - Second, Whereas C++ used to forbid references to references, C++11 defines
+ *   'collapsing rules': 'T& &', 'T&& &', and 'T& &&' (that is, any combination
+ *   involving an lvalue reference) now collapse to simply 'T&'; and 'T&& &&'
+ *   collapses to 'T&&'.
+ *
+ *   Thus, in the call above, 'XArg&&' is 'X&&'; and 'YArg&&' is 'Y& &&', which
+ *   collapses to 'Y&'. Because the arguments are declared as rvalue references
+ *   to template arguments, the lvalue-ness "shines through" where present.
+ *
+ * Then, the 'Forward<T>' function --- you must invoke 'Forward' with its type
+ * argument --- returns an lvalue reference or an rvalue reference to its
+ * argument, depending on what T is. In our unified constructor definition, that
+ * means that we'll invoke either the copy or move constructors for x and y,
+ * depending on what we gave C's constructor. In our call, we'll move 'foo()'
+ * into 'x', but copy 'yy' into 'y'.
+ *
+ * This header file defines Move and Forward in the mozilla namespace. It's up
+ * to individual containers to annotate moves as such, by calling Move; and it's
+ * up to individual types to define move constructors and assignment operators
+ * when valuable.
+ *
+ * (C++11 says that the <utility> header file should define 'std::move' and
+ * 'std::forward', which are just like our 'Move' and 'Forward'; but those
+ * definitions aren't available in that header on all our platforms, so we
+ * define them ourselves here.)
+ *
+ * 0. This pattern is known as "perfect forwarding".  Interestingly, it is not
+ *    actually perfect, and it can't forward all possible argument expressions!
+ *    There is a C++11 issue: you can't form a reference to a bit-field.  As a
+ *    workaround, assign the bit-field to a local variable and use that:
+ *
+ *      // C is as above
+ *      struct S { int x : 1; } s;
+ *      C(s.x, 0); // BAD: s.x is a reference to a bit-field, can't form those
+ *      int tmp = s.x;
+ *      C(tmp, 0); // OK: tmp not a bit-field
+ */
+
+/**
+ * Identical to std::Move(); this is necessary until our stlport supports
+ * std::move().
+ */
+template<typename T>
+inline typename RemoveReference<T>::Type&&
+Move(T&& aX)
+{
+  return static_cast<typename RemoveReference<T>::Type&&>(aX);
+}
+
+/**
+ * These two overloads are identical to std::forward(); they are necessary until
+ * our stlport supports std::forward().
+ */
+template<typename T>
+inline T&&
+Forward(typename RemoveReference<T>::Type& aX)
+{
+  return static_cast<T&&>(aX);
+}
+
+template<typename T>
+inline T&&
+Forward(typename RemoveReference<T>::Type&& aX)
+{
+  static_assert(!IsLvalueReference<T>::value,
+                "misuse of Forward detected!  try the other overload");
+  return static_cast<T&&>(aX);
+}
+
+/** Swap |aX| and |aY| using move-construction if possible. */
+template<typename T>
+inline void
+Swap(T& aX, T& aY)
+{
+  T tmp(Move(aX));
+  aX = Move(aY);
+  aY = Move(tmp);
+}
+
+} // namespace mozilla
+
+#endif /* mozilla_Move_h */
diff --git a/onlineupdate/source/update/inc/mozilla/Pair.h b/onlineupdate/source/update/inc/mozilla/Pair.h
new file mode 100644
index 000000000000..ad7b86a29c62
--- /dev/null
+++ b/onlineupdate/source/update/inc/mozilla/Pair.h
@@ -0,0 +1,219 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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/. */
+
+/* A class holding a pair of objects that tries to conserve storage space. */
+
+#ifndef mozilla_Pair_h
+#define mozilla_Pair_h
+
+#include "mozilla/Attributes.h"
+#include "mozilla/Move.h"
+#include "mozilla/TypeTraits.h"
+
+namespace mozilla {
+
+namespace detail {
+
+enum StorageType { AsBase, AsMember };
+
+// Optimize storage using the Empty Base Optimization -- that empty base classes
+// don't take up space -- to optimize size when one or the other class is
+// stateless and can be used as a base class.
+//
+// The extra conditions on storage for B are necessary so that PairHelper won't
+// ambiguously inherit from either A or B, such that one or the other base class
+// would be inaccessible.
+template<typename A, typename B,
+         detail::StorageType =
+           IsEmpty<A>::value ? detail::AsBase : detail::AsMember,
+         detail::StorageType =
+           IsEmpty<B>::value && !IsBaseOf<A, B>::value && !IsBaseOf<B, A>::value
+           ? detail::AsBase
+           : detail::AsMember>
+struct PairHelper;
+
+template<typename A, typename B>
+struct PairHelper<A, B, AsMember, AsMember>
+{
+protected:
+  template<typename AArg, typename BArg>
+  PairHelper(AArg&& aA, BArg&& aB)
+    : mFirstA(Forward<AArg>(aA)),
+      mSecondB(Forward<BArg>(aB))
+  {}
+
+  A& first() { return mFirstA; }
+  const A& first() const { return mFirstA; }
+  B& second() { return mSecondB; }
+  const B& second() const { return mSecondB; }
+
+  void swap(PairHelper& aOther)
+  {
+    Swap(mFirstA, aOther.mFirstA);
+    Swap(mSecondB, aOther.mSecondB);
+  }
+
+private:
+  A mFirstA;
+  B mSecondB;
+};
+
+template<typename A, typename B>
+struct PairHelper<A, B, AsMember, AsBase> : private B
+{
+protected:
+  template<typename AArg, typename BArg>
+  PairHelper(AArg&& aA, BArg&& aB)
+    : B(Forward<BArg>(aB)),
+      mFirstA(Forward<AArg>(aA))
+  {}
+
+  A& first() { return mFirstA; }
+  const A& first() const { return mFirstA; }
+  B& second() { return *this; }
+  const B& second() const { return *this; }
+
+  void swap(PairHelper& aOther)
+  {
+    Swap(mFirstA, aOther.mFirstA);
+    Swap(static_cast<B&>(*this), static_cast<B&>(aOther));
+  }
+
+private:
+  A mFirstA;
+};
+
+template<typename A, typename B>
+struct PairHelper<A, B, AsBase, AsMember> : private A
+{
+protected:
+  template<typename AArg, typename BArg>
+  PairHelper(AArg&& aA, BArg&& aB)
+    : A(Forward<AArg>(aA)),
+      mSecondB(Forward<BArg>(aB))
+  {}
+
+  A& first() { return *this; }
+  const A& first() const { return *this; }
+  B& second() { return mSecondB; }
+  const B& second() const { return mSecondB; }
+
+  void swap(PairHelper& aOther)
+  {
+    Swap(static_cast<A&>(*this), static_cast<A&>(aOther));
+    Swap(mSecondB, aOther.mSecondB);
+  }
+
+private:
+  B mSecondB;
+};
+
+template<typename A, typename B>
+struct PairHelper<A, B, AsBase, AsBase> : private A, private B
+{
+protected:
+  template<typename AArg, typename BArg>
+  PairHelper(AArg&& aA, BArg&& aB)
+    : A(Forward<AArg>(aA)),
+      B(Forward<BArg>(aB))
+  {}
+
+  A& first() { return static_cast<A&>(*this); }
+  const A& first() const { return static_cast<A&>(*this); }
+  B& second() { return static_cast<B&>(*this); }
+  const B& second() const { return static_cast<B&>(*this); }
+
+  void swap(PairHelper& aOther)
+  {
+    Swap(static_cast<A&>(*this), static_cast<A&>(aOther));
+    Swap(static_cast<B&>(*this), static_cast<B&>(aOther));
+  }
+};
+
+} // namespace detail
+
+/**
+ * Pair is the logical concatenation of an instance of A with an instance B.
+ * Space is conserved when possible.  Neither A nor B may be a final class.
+ *
+ * It's typically clearer to have individual A and B member fields.  Except if
+ * you want the space-conserving qualities of Pair, you're probably better off
+ * not using this!
+ *
+ * No guarantees are provided about the memory layout of A and B, the order of
+ * initialization or destruction of A and B, and so on.  (This is approximately
+ * required to optimize space usage.)  The first/second names are merely
+ * conceptual!
+ */
+template<typename A, typename B>
+struct Pair
+  : private detail::PairHelper<A, B>
+{
+  typedef typename detail::PairHelper<A, B> Base;
+
+public:
+  template<typename AArg, typename BArg>
+  Pair(AArg&& aA, BArg&& aB)
+    : Base(Forward<AArg>(aA), Forward<BArg>(aB))
+  {}
+
+  Pair(Pair&& aOther)
+    : Base(Move(aOther.first()), Move(aOther.second()))
+  { }
+
+  Pair(const Pair& aOther) = default;
+
+  Pair& operator=(Pair&& aOther)
+  {
+    MOZ_ASSERT(this != &aOther, "Self-moves are prohibited");
+
+    first() = Move(aOther.first());
+    second() = Move(aOther.second());
+
+    return *this;
+  }
+
+  Pair& operator=(const Pair& aOther) = default;
+
+  /** The A instance. */
+  using Base::first;
+  /** The B instance. */
+  using Base::second;
+
+  /** Swap this pair with another pair. */
+  void swap(Pair& aOther) { Base::swap(aOther); }
+};
+
+template<typename A, class B>
+void
+Swap(Pair<A, B>& aX, Pair<A, B>& aY)
+{
+  aX.swap(aY);
+}
+
+/**
+ * MakePair allows you to construct a Pair instance using type inference. A call
+ * like this:
+ *
+ *   MakePair(Foo(), Bar())
+ *
+ * will return a Pair<Foo, Bar>.
+ */
+template<typename A, typename B>
+Pair<typename RemoveCV<typename RemoveReference<A>::Type>::Type,
+     typename RemoveCV<typename RemoveReference<B>::Type>::Type>
+MakePair(A&& aA, B&& aB)
+{
+  return
+    Pair<typename RemoveCV<typename RemoveReference<A>::Type>::Type,
+         typename RemoveCV<typename RemoveReference<B>::Type>::Type>(
+             Forward<A>(aA),
+             Forward<B>(aB));
+}
+
+} // namespace mozilla
+
+#endif /* mozilla_Pair_h */
diff --git a/onlineupdate/source/update/inc/mozilla/UniquePtr.h b/onlineupdate/source/update/inc/mozilla/UniquePtr.h
new file mode 100644
index 000000000000..d58ffe335c53
--- /dev/null
+++ b/onlineupdate/source/update/inc/mozilla/UniquePtr.h
@@ -0,0 +1,659 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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/. */
+
+/* Smart pointer managing sole ownership of a resource. */
+
+#ifndef mozilla_UniquePtr_h
+#define mozilla_UniquePtr_h
+
+#include "mozilla/Assertions.h"
+#include "mozilla/Attributes.h"
+#include "mozilla/Compiler.h"
+#include "mozilla/Move.h"
+#include "mozilla/Pair.h"
+#include "mozilla/TypeTraits.h"
+
+namespace mozilla {
+
+template<typename T> class DefaultDelete;
+template<typename T, class D = DefaultDelete<T>> class UniquePtr;
+
+} // namespace mozilla
+
+namespace mozilla {
+
+/**
+ * UniquePtr is a smart pointer that wholly owns a resource.  Ownership may be
+ * transferred out of a UniquePtr through explicit action, but otherwise the
+ * resource is destroyed when the UniquePtr is destroyed.
+ *
+ * UniquePtr is similar to C++98's std::auto_ptr, but it improves upon auto_ptr
+ * in one crucial way: it's impossible to copy a UniquePtr.  Copying an auto_ptr
+ * obviously *can't* copy ownership of its singly-owned resource.  So what
+ * happens if you try to copy one?  Bizarrely, ownership is implicitly
+ * *transferred*, preserving single ownership but breaking code that assumes a
+ * copy of an object is identical to the original.  (This is why auto_ptr is
+ * prohibited in STL containers.)
+ *
+ * UniquePtr solves this problem by being *movable* rather than copyable.
+ * Instead of passing a |UniquePtr u| directly to the constructor or assignment
+ * operator, you pass |Move(u)|.  In doing so you indicate that you're *moving*
+ * ownership out of |u|, into the target of the construction/assignment.  After
+ * the transfer completes, |u| contains |nullptr| and may be safely destroyed.
+ * This preserves single ownership but also allows UniquePtr to be moved by
+ * algorithms that have been made move-safe.  (Note: if |u| is instead a
+ * temporary expression, don't use |Move()|: just pass the expression, because
+ * it's already move-ready.  For more information see Move.h.)
+ *
+ * UniquePtr is also better than std::auto_ptr in that the deletion operation is
+ * customizable.  An optional second template parameter specifies a class that
+ * (through its operator()(T*)) implements the desired deletion policy.  If no
+ * policy is specified, mozilla::DefaultDelete<T> is used -- which will either
+ * |delete| or |delete[]| the resource, depending whether the resource is an
+ * array.  Custom deletion policies ideally should be empty classes (no member
+ * fields, no member fields in base classes, no virtual methods/inheritance),
+ * because then UniquePtr can be just as efficient as a raw pointer.
+ *
+ * Use of UniquePtr proceeds like so:
+ *
+ *   UniquePtr<int> g1; // initializes to nullptr
+ *   g1.reset(new int); // switch resources using reset()
+ *   g1 = nullptr; // clears g1, deletes the int
+ *
+ *   UniquePtr<int> g2(new int); // owns that int
+ *   int* p = g2.release(); // g2 leaks its int -- still requires deletion
+ *   delete p; // now freed
+ *
+ *   struct S { int x; S(int x) : x(x) {} };
+ *   UniquePtr<S> g3, g4(new S(5));
+ *   g3 = Move(g4); // g3 owns the S, g4 cleared
+ *   S* p = g3.get(); // g3 still owns |p|
+ *   assert(g3->x == 5); // operator-> works (if .get() != nullptr)
+ *   assert((*g3).x == 5); // also operator* (again, if not cleared)
+ *   Swap(g3, g4); // g4 now owns the S, g3 cleared
+ *   g3.swap(g4);  // g3 now owns the S, g4 cleared
+ *   UniquePtr<S> g5(Move(g3)); // g5 owns the S, g3 cleared
+ *   g5.reset(); // deletes the S, g5 cleared
+ *
+ *   struct FreePolicy { void operator()(void* p) { free(p); } };
+ *   UniquePtr<int, FreePolicy> g6(static_cast<int*>(malloc(sizeof(int))));
+ *   int* ptr = g6.get();
+ *   g6 = nullptr; // calls free(ptr)
+ *
+ * Now, carefully note a few things you *can't* do:
+ *
+ *   UniquePtr<int> b1;
+ *   b1 = new int; // BAD: can only assign another UniquePtr
+ *   int* ptr = b1; // BAD: no auto-conversion to pointer, use get()
+ *
+ *   UniquePtr<int> b2(b1); // BAD: can't copy a UniquePtr
+ *   UniquePtr<int> b3 = b1; // BAD: can't copy-assign a UniquePtr
+ *
+ * (Note that changing a UniquePtr to store a direct |new| expression is
+ * permitted, but usually you should use MakeUnique, defined at the end of this
+ * header.)
+ *
+ * A few miscellaneous notes:
+ *
+ * UniquePtr, when not instantiated for an array type, can be move-constructed
+ * and move-assigned, not only from itself but from "derived" UniquePtr<U, E>
+ * instantiations where U converts to T and E converts to D.  If you want to use
+ * this, you're going to have to specify a deletion policy for both UniquePtr
+ * instantations, and T pretty much has to have a virtual destructor.  In other
+ * words, this doesn't work:
+ *
+ *   struct Base { virtual ~Base() {} };
+ *   struct Derived : Base {};
+ *
+ *   UniquePtr<Base> b1;
+ *   // BAD: DefaultDelete<Base> and DefaultDelete<Derived> don't interconvert
+ *   UniquePtr<Derived> d1(Move(b));
+ *
+ *   UniquePtr<Base> b2;
+ *   UniquePtr<Derived, DefaultDelete<Base>> d2(Move(b2)); // okay
+ *
+ * UniquePtr is specialized for array types.  Specializing with an array type
+ * creates a smart-pointer version of that array -- not a pointer to such an
+ * array.
+ *
+ *   UniquePtr<int[]> arr(new int[5]);
+ *   arr[0] = 4;
+ *
+ * What else is different?  Deletion of course uses |delete[]|.  An operator[]
+ * is provided.  Functionality that doesn't make sense for arrays is removed.
+ * The constructors and mutating methods only accept array pointers (not T*, U*
+ * that converts to T*, or UniquePtr<U[]> or UniquePtr<U>) or |nullptr|.
+ *
+ * It's perfectly okay to return a UniquePtr from a method to assure the related
+ * resource is properly deleted.  You'll need to use |Move()| when returning a
+ * local UniquePtr.  Otherwise you can return |nullptr|, or you can return
+ * |UniquePtr(ptr)|.
+ *
+ * UniquePtr will commonly be a member of a class, with lifetime equivalent to
+ * that of that class.  If you want to expose the related resource, you could
+ * expose a raw pointer via |get()|, but ownership of a raw pointer is
+ * inherently unclear.  So it's better to expose a |const UniquePtr&| instead.
+ * This prohibits mutation but still allows use of |get()| when needed (but
+ * operator-> is preferred).  Of course, you can only use this smart pointer as
+ * long as the enclosing class instance remains live -- no different than if you
+ * exposed the |get()| raw pointer.
+ *
+ * To pass a UniquePtr-managed resource as a pointer, use a |const UniquePtr&|
+ * argument.  To specify an inout parameter (where the method may or may not
+ * take ownership of the resource, or reset it), or to specify an out parameter
+ * (where simply returning a |UniquePtr| isn't possible), use a |UniquePtr&|
+ * argument.  To unconditionally transfer ownership of a UniquePtr
+ * into a method, use a |UniquePtr| argument.  To conditionally transfer
+ * ownership of a resource into a method, should the method want it, use a
+ * |UniquePtr&&| argument.
+ */
+template<typename T, class D>
+class UniquePtr
+{
+public:
+  typedef T* Pointer;
+  typedef T ElementType;
+  typedef D DeleterType;
+
+private:
+  Pair<Pointer, DeleterType> mTuple;
+
+  Pointer& ptr() { return mTuple.first(); }
+  const Pointer& ptr() const { return mTuple.first(); }
+
+  DeleterType& del() { return mTuple.second(); }
+  const DeleterType& del() const { return mTuple.second(); }
+
+public:
+  /**
+   * Construct a UniquePtr containing |nullptr|.
+   */
+  MOZ_CONSTEXPR UniquePtr()
+    : mTuple(static_cast<Pointer>(nullptr), DeleterType())
+  {
+    static_assert(!IsPointer<D>::value, "must provide a deleter instance");
+    static_assert(!IsReference<D>::value, "must provide a deleter instance");
+  }
+
+  /**
+   * Construct a UniquePtr containing |aPtr|.
+   */
+  explicit UniquePtr(Pointer aPtr)
+    : mTuple(aPtr, DeleterType())
+  {
+    static_assert(!IsPointer<D>::value, "must provide a deleter instance");
+    static_assert(!IsReference<D>::value, "must provide a deleter instance");
+  }
+
+  UniquePtr(Pointer aPtr,
+            typename Conditional<IsReference<D>::value,
+                                 D,
+                                 const D&>::Type aD1)
+    : mTuple(aPtr, aD1)
+  {}
+
+  // If you encounter an error with MSVC10 about RemoveReference below, along
+  // the lines that "more than one partial specialization matches the template
+  // argument list": don't use UniquePtr<T, reference to function>!  Ideally
+  // you should make deletion use the same function every time, using a
+  // deleter policy:
+  //
+  //   // BAD, won't compile with MSVC10, deleter doesn't need to be a
+  //   // variable at all
+  //   typedef void (&FreeSignature)(void*);
+  //   UniquePtr<int, FreeSignature> ptr((int*) malloc(sizeof(int)), free);
+  //
+  //   // GOOD, compiles with MSVC10, deletion behavior statically known and
+  //   // optimizable
+  //   struct DeleteByFreeing
+  //   {
+  //     void operator()(void* aPtr) { free(aPtr); }
+  //   };
+  //
+  // If deletion really, truly, must be a variable: you might be able to work
+  // around this with a deleter class that contains the function reference.
+  // But this workaround is untried and untested, because variable deletion
+  // behavior really isn't something you should use.
+  UniquePtr(Pointer aPtr,
+            typename RemoveReference<D>::Type&& aD2)
+    : mTuple(aPtr, Move(aD2))
+  {
+    static_assert(!IsReference<D>::value,
+                  "rvalue deleter can't be stored by reference");
+  }
+
+  UniquePtr(UniquePtr&& aOther)
+    : mTuple(aOther.release(), Forward<DeleterType>(aOther.getDeleter()))
+  {}
+
+  MOZ_IMPLICIT
+  UniquePtr(decltype(nullptr))
+    : mTuple(nullptr, DeleterType())
+  {
+    static_assert(!IsPointer<D>::value, "must provide a deleter instance");
+    static_assert(!IsReference<D>::value, "must provide a deleter instance");
+  }
+
+  template<typename U, class E>
+  UniquePtr(UniquePtr<U, E>&& aOther,
+            typename EnableIf<IsConvertible<typename UniquePtr<U, E>::Pointer,
+                                            Pointer>::value &&
+                              !IsArray<U>::value &&
+                              (IsReference<D>::value
+                               ? IsSame<D, E>::value
+                               : IsConvertible<E, D>::value),
+                              int>::Type aDummy = 0)
+    : mTuple(aOther.release(), Forward<E>(aOther.getDeleter()))
+  {
+  }
+
+  ~UniquePtr() { reset(nullptr); }
+
+  UniquePtr& operator=(UniquePtr&& aOther)
+  {
+    reset(aOther.release());
+    getDeleter() = Forward<DeleterType>(aOther.getDeleter());
+    return *this;
+  }
+
+  template<typename U, typename E>
+  UniquePtr& operator=(UniquePtr<U, E>&& aOther)
+  {
+    static_assert(IsConvertible<typename UniquePtr<U, E>::Pointer,
+                                Pointer>::value,
+                  "incompatible UniquePtr pointees");
+    static_assert(!IsArray<U>::value,
+                  "can't assign from UniquePtr holding an array");
+
+    reset(aOther.release());
+    getDeleter() = Forward<E>(aOther.getDeleter());
+    return *this;
+  }
+
+  UniquePtr& operator=(decltype(nullptr))
+  {
+    reset(nullptr);
+    return *this;
+  }
+
+  T& operator*() const { return *get(); }
+  Pointer operator->() const
+  {
+    MOZ_ASSERT(get(), "dereferencing a UniquePtr containing nullptr");
+    return get();
+  }
+
+  explicit operator bool() const { return get() != nullptr; }
+
+  Pointer get() const { return ptr(); }
+
+  DeleterType& getDeleter() { return del(); }
+  const DeleterType& getDeleter() const { return del(); }
+
+  Pointer release()
+  {
+    Pointer p = ptr();
+    ptr() = nullptr;
+    return p;
+  }
+
+  void reset(Pointer aPtr = Pointer())
+  {
+    Pointer old = ptr();
+    ptr() = aPtr;
+    if (old != nullptr) {
+      getDeleter()(old);
+    }
+  }
+
+  void swap(UniquePtr& aOther)
+  {
+    mTuple.swap(aOther.mTuple);
+  }
+
+private:
+  UniquePtr(const UniquePtr& aOther) = delete; // construct using Move()!
+  void operator=(const UniquePtr& aOther) = delete; // assign using Move()!
+};
+
+// In case you didn't read the comment by the main definition (you should!): the
+// UniquePtr<T[]> specialization exists to manage array pointers.  It deletes
+// such pointers using delete[], it will reject construction and modification
+// attempts using U* or U[].  Otherwise it works like the normal UniquePtr.
+template<typename T, class D>
+class UniquePtr<T[], D>
+{
+public:
+  typedef T* Pointer;
+  typedef T ElementType;
+  typedef D DeleterType;
+
+private:
+  Pair<Pointer, DeleterType> mTuple;
+
+public:
+  /**
+   * Construct a UniquePtr containing nullptr.
+   */
+  MOZ_CONSTEXPR UniquePtr()
+    : mTuple(static_cast<Pointer>(nullptr), DeleterType())
+  {
+    static_assert(!IsPointer<D>::value, "must provide a deleter instance");
+    static_assert(!IsReference<D>::value, "must provide a deleter instance");
+  }
+
+  /**
+   * Construct a UniquePtr containing |aPtr|.
+   */
+  explicit UniquePtr(Pointer aPtr)
+    : mTuple(aPtr, DeleterType())
+  {
+    static_assert(!IsPointer<D>::value, "must provide a deleter instance");
+    static_assert(!IsReference<D>::value, "must provide a deleter instance");
+  }
+
+private:
+  // delete[] knows how to handle *only* an array of a single class type.  For
+  // delete[] to work correctly, it must know the size of each element, the
+  // fields and base classes of each element requiring destruction, and so on.
+  // So forbid all overloads which would end up invoking delete[] on a pointer
+  // of the wrong type.
+  template<typename U>
+  UniquePtr(U&& aU,
+            typename EnableIf<IsPointer<U>::value &&
+                              IsConvertible<U, Pointer>::value,
+                              int>::Type aDummy = 0)
+  = delete;
+
+public:
+  UniquePtr(Pointer aPtr,
+            typename Conditional<IsReference<D>::value,
+                                 D,
+                                 const D&>::Type aD1)
+    : mTuple(aPtr, aD1)
+  {}
+
+  // If you encounter an error with MSVC10 about RemoveReference below, along
+  // the lines that "more than one partial specialization matches the template
+  // argument list": don't use UniquePtr<T[], reference to function>!  See the
+  // comment by this constructor in the non-T[] specialization above.
+  UniquePtr(Pointer aPtr,
+            typename RemoveReference<D>::Type&& aD2)
+    : mTuple(aPtr, Move(aD2))
+  {
+    static_assert(!IsReference<D>::value,
+                  "rvalue deleter can't be stored by reference");
+  }
+
+private:
+  // Forbidden for the same reasons as stated above.
+  template<typename U, typename V>
+  UniquePtr(U&& aU, V&& aV,
+            typename EnableIf<IsPointer<U>::value &&
+                              IsConvertible<U, Pointer>::value,
+                              int>::Type aDummy = 0)
+  = delete;
+
+public:
+  UniquePtr(UniquePtr&& aOther)
+    : mTuple(aOther.release(), Forward<DeleterType>(aOther.getDeleter()))
+  {}
+
+  MOZ_IMPLICIT
+  UniquePtr(decltype(nullptr))
+    : mTuple(nullptr, DeleterType())
+  {
+    static_assert(!IsPointer<D>::value, "must provide a deleter instance");
+    static_assert(!IsReference<D>::value, "must provide a deleter instance");
+  }
+
+  ~UniquePtr() { reset(nullptr); }
+
+  UniquePtr& operator=(UniquePtr&& aOther)
+  {
+    reset(aOther.release());
+    getDeleter() = Forward<DeleterType>(aOther.getDeleter());
+    return *this;
+  }
+
+  UniquePtr& operator=(decltype(nullptr))
+  {
+    reset();
+    return *this;
+  }
+
+  explicit operator bool() const { return get() != nullptr; }
+
+  T& operator[](decltype(sizeof(int)) aIndex) const { return get()[aIndex]; }
+  Pointer get() const { return mTuple.first(); }
+
+  DeleterType& getDeleter() { return mTuple.second(); }
+  const DeleterType& getDeleter() const { return mTuple.second(); }
+
+  Pointer release()
+  {
+    Pointer p = mTuple.first();
+    mTuple.first() = nullptr;
+    return p;
+  }
+
+  void reset(Pointer aPtr = Pointer())
+  {
+    Pointer old = mTuple.first();
+    mTuple.first() = aPtr;
+    if (old != nullptr) {
+      mTuple.second()(old);
+    }
+  }
+
+  void reset(decltype(nullptr))
+  {
+    Pointer old = mTuple.first();
+    mTuple.first() = nullptr;
+    if (old != nullptr) {
+      mTuple.second()(old);
+    }
+  }
+
+private:
+  template<typename U>
+  void reset(U) = delete;
+
+public:
+  void swap(UniquePtr& aOther) { mTuple.swap(aOther.mTuple); }
+
+private:
+  UniquePtr(const UniquePtr& aOther) = delete; // construct using Move()!
+  void operator=(const UniquePtr& aOther) = delete; // assign using Move()!
+};
+
+/** A default deletion policy using plain old operator delete. */
+template<typename T>
+class DefaultDelete
+{
+public:
+  MOZ_CONSTEXPR DefaultDelete() {}
+
+  template<typename U>
+  DefaultDelete(const DefaultDelete<U>& aOther,
+                typename EnableIf<mozilla::IsConvertible<U*, T*>::value,
+                                  int>::Type aDummy = 0)
+  {}
+
+  void operator()(T* aPtr) const
+  {
+    static_assert(sizeof(T) > 0, "T must be complete");
+    delete aPtr;
+  }
+};
+
+/** A default deletion policy using operator delete[]. */
+template<typename T>
+class DefaultDelete<T[]>
+{
+public:
+  MOZ_CONSTEXPR DefaultDelete() {}
+
+  void operator()(T* aPtr) const
+  {
+    static_assert(sizeof(T) > 0, "T must be complete");
+    delete[] aPtr;
+  }
+
+private:
+  template<typename U>
+  void operator()(U* aPtr) const = delete;
+};
+
+template<typename T, class D>
+void
+Swap(UniquePtr<T, D>& aX, UniquePtr<T, D>& aY)
+{
+  aX.swap(aY);
+}
+
+template<typename T, class D, typename U, class E>
+bool
+operator==(const UniquePtr<T, D>& aX, const UniquePtr<U, E>& aY)
+{
+  return aX.get() == aY.get();
+}
+
+template<typename T, class D, typename U, class E>
+bool
+operator!=(const UniquePtr<T, D>& aX, const UniquePtr<U, E>& aY)
+{
+  return aX.get() != aY.get();
+}
+
+template<typename T, class D>
+bool
+operator==(const UniquePtr<T, D>& aX, decltype(nullptr))
+{
+  return !aX;
+}
+
+template<typename T, class D>
+bool
+operator==(decltype(nullptr), const UniquePtr<T, D>& aX)
+{
+  return !aX;
+}
+
+template<typename T, class D>
+bool
+operator!=(const UniquePtr<T, D>& aX, decltype(nullptr))
+{
+  return bool(aX);
+}
+
+template<typename T, class D>
+bool
+operator!=(decltype(nullptr), const UniquePtr<T, D>& aX)
+{
+  return bool(aX);
+}
+
+// No operator<, operator>, operator<=, operator>= for now because simplicity.
+
+namespace detail {
+
+template<typename T>
+struct UniqueSelector
+{
+  typedef UniquePtr<T> SingleObject;
+};
+
+template<typename T>
+struct UniqueSelector<T[]>
+{
+  typedef UniquePtr<T[]> UnknownBound;
+};
+
+template<typename T, decltype(sizeof(int)) N>
+struct UniqueSelector<T[N]>
+{
+  typedef UniquePtr<T[N]> KnownBound;
+};
+
+} // namespace detail
+
+/**
+ * MakeUnique is a helper function for allocating new'd objects and arrays,
+ * returning a UniquePtr containing the resulting pointer.  The semantics of
+ * MakeUnique<Type>(...) are as follows.
+ *
+ *   If Type is an array T[n]:
+ *     Disallowed, deleted, no overload for you!
+ *   If Type is an array T[]:
+ *     MakeUnique<T[]>(size_t) is the only valid overload.  The pointer returned
+ *     is as if by |new T[n]()|, which value-initializes each element.  (If T
+ *     isn't a class type, this will zero each element.  If T is a class type,
+ *     then roughly speaking, each element will be constructed using its default
+ *     constructor.  See C++11 [dcl.init]p7 for the full gory details.)
+ *   If Type is non-array T:
+ *     The arguments passed to MakeUnique<T>(...) are forwarded into a
+ *     |new T(...)| call, initializing the T as would happen if executing
+ *     |T(...)|.
+ *
+ * There are various benefits to using MakeUnique instead of |new| expressions.
+ *
+ * First, MakeUnique eliminates use of |new| from code entirely.  If objects are
+ * only created through UniquePtr, then (assuming all explicit release() calls
+ * are safe, including transitively, and no type-safety casting funniness)
+ * correctly maintained ownership of the UniquePtr guarantees no leaks are
+ * possible.  (This pays off best if a class is only ever created through a
+ * factory method on the class, using a private constructor.)
+ *
+ * Second, initializing a UniquePtr using a |new| expression requires repeating
+ * the name of the new'd type, whereas MakeUnique in concert with the |auto|
+ * keyword names it only once:
+ *
+ *   UniquePtr<char> ptr1(new char()); // repetitive
+ *   auto ptr2 = MakeUnique<char>();   // shorter
+ *
+ * Of course this assumes the reader understands the operation MakeUnique
+ * performs.  In the long run this is probably a reasonable assumption.  In the
+ * short run you'll have to use your judgment about what readers can be expected
+ * to know, or to quickly look up.
+ *
+ * Third, a call to MakeUnique can be assigned directly to a UniquePtr.  In
+ * contrast you can't assign a pointer into a UniquePtr without using the
+ * cumbersome reset().
+ *
+ *   UniquePtr<char> p;
+ *   p = new char;           // ERROR
+ *   p.reset(new char);      // works, but fugly
+ *   p = MakeUnique<char>(); // preferred
+ *
+ * (And third, although not relevant to Mozilla: MakeUnique is exception-safe.
+ * An exception thrown after |new T| succeeds will leak that memory, unless the
+ * pointer is assigned to an object that will manage its ownership.  UniquePtr
+ * ably serves this function.)
+ */
+
+template<typename T, typename... Args>
+typename detail::UniqueSelector<T>::SingleObject
+MakeUnique(Args&&... aArgs)
+{
+  return UniquePtr<T>(new T(Forward<Args>(aArgs)...));
+}
+
+template<typename T>
+typename detail::UniqueSelector<T>::UnknownBound
+MakeUnique(decltype(sizeof(int)) aN)
+{
+  typedef typename RemoveExtent<T>::Type ArrayType;
+  return UniquePtr<T>(new ArrayType[aN]());
+}
+
+template<typename T, typename... Args>
+typename detail::UniqueSelector<T>::KnownBound
+MakeUnique(Args&&... aArgs) = delete;
+
+} // namespace mozilla
+
+#endif /* mozilla_UniquePtr_h */
diff --git a/onlineupdate/source/update/inc/nsAutoRef.h b/onlineupdate/source/update/inc/nsAutoRef.h
new file mode 100644
index 000000000000..a159f5954e96
--- /dev/null
+++ b/onlineupdate/source/update/inc/nsAutoRef.h
@@ -0,0 +1,670 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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 nsAutoRef_h_
+#define nsAutoRef_h_
+
+#include "mozilla/Attributes.h"
+
+template <class T> class nsSimpleRef;
+template <class T> class nsAutoRefBase;
+template <class T> class nsReturnRef;
+template <class T> class nsReturningRef;
+
+/**
+ * template <class T> class nsAutoRef
+ *
+ * A class that holds a handle to a resource that must be released.
+ * No reference is added on construction.
+ *
+ * No copy constructor nor copy assignment operators are available, so the
+ * resource will be held until released on destruction or explicitly
+ * |reset()| or transferred through provided methods.
+ *
+ * The publicly available methods are the public methods on this class and its
+ * public base classes |nsAutoRefBase<T>| and |nsSimpleRef<T>|.
+ *
+ * For ref-counted resources see also |nsCountedRef<T>|.
+ * For function return values see |nsReturnRef<T>|.
+ *
+ * For each class |T|, |nsAutoRefTraits<T>| or |nsSimpleRef<T>| must be
+ * specialized to use |nsAutoRef<T>| and |nsCountedRef<T>|.
+ *
+ * @param T  A class identifying the type of reference held by the
+ *           |nsAutoRef<T>| and the unique set methods for managing references
+ *           to the resource (defined by |nsAutoRefTraits<T>| or
+ *           |nsSimpleRef<T>|).
+ *
+ *           Often this is the class representing the resource.  Sometimes a
+ *           new possibly-incomplete class may need to be declared.
+ *
+ *
+ * Example:  An Automatically closing file descriptor
+ *
+ * // References that are simple integral types (as file-descriptors are)
+ * // usually need a new class to represent the resource and how to handle its
+ * // references.
+ * class nsRawFD;
+ *
+ * // Specializing nsAutoRefTraits<nsRawFD> describes how to manage file
+ * // descriptors, so that nsAutoRef<nsRawFD> provides automatic closing of
+ * // its file descriptor on destruction.
+ * template <>
+ * class nsAutoRefTraits<nsRawFD> {
+ * public:
+ *     // The file descriptor is held in an int.
+ *     typedef int RawRef;
+ *     // -1 means that there is no file associated with the handle.
+ *     static int Void() { return -1; }
+ *     // The file associated with a file descriptor is released with close().
+ *     static void Release(RawRef aFD) { close(aFD); }
+ * };
+ *
+ * // A function returning a file descriptor that must be closed.
+ * nsReturnRef<nsRawFD> get_file(const char *filename) {
+ *     // Constructing from a raw file descriptor assumes ownership.
+ *     nsAutoRef<nsRawFD> fd(open(filename, O_RDONLY));
+ *     fcntl(fd, F_SETFD, FD_CLOEXEC);
+ *     return fd.out();
+ * }
+ *
+ * void f() {
+ *     unsigned char buf[1024];
+ *
+ *     // Hold a file descriptor for /etc/hosts in fd1.
+ *     nsAutoRef<nsRawFD> fd1(get_file("/etc/hosts"));
+ *
+ *     nsAutoRef<nsRawFD> fd2;
+ *     fd2.steal(fd1); // fd2 takes the file descriptor from fd1
+ *     ssize_t count = read(fd1, buf, 1024); // error fd1 has no file
+ *     count = read(fd2, buf, 1024); // reads from /etc/hosts
+ *
+ *     // If the file descriptor is not stored then it is closed.
+ *     get_file("/etc/login.defs"); // login.defs is closed
+ *
+ *     // Now use fd1 to hold a file descriptor for /etc/passwd.
+ *     fd1 = get_file("/etc/passwd");
+ *
+ *     // The nsAutoRef<nsRawFD> can give up the file descriptor if explicitly
+ *     // instructed, but the caller must then ensure that the file is closed.
+ *     int rawfd = fd1.disown();
+ *
+ *     // Assume ownership of another file descriptor.
+ *     fd1.own(open("/proc/1/maps");
+ *
+ *     // On destruction, fd1 closes /proc/1/maps and fd2 closes /etc/hosts,
+ *     // but /etc/passwd is not closed.
+ * }
+ *
+ */
+
+
+template <class T>
+class nsAutoRef : public nsAutoRefBase<T>
+{
+protected:
+  typedef nsAutoRef<T> ThisClass;
+  typedef nsAutoRefBase<T> BaseClass;
+  typedef nsSimpleRef<T> SimpleRef;
+  typedef typename BaseClass::RawRefOnly RawRefOnly;
+  typedef typename BaseClass::LocalSimpleRef LocalSimpleRef;
+
+public:
+  nsAutoRef()
+  {
+  }
+
+  // Explicit construction is required so as not to risk unintentionally
+  // releasing the resource associated with a raw ref.
+  explicit nsAutoRef(RawRefOnly aRefToRelease)
+    : BaseClass(aRefToRelease)
+  {
+  }
+
+  // Construction from a nsReturnRef<T> function return value, which expects
+  // to give up ownership, transfers ownership.
+  // (nsReturnRef<T> is converted to const nsReturningRef<T>.)
+  explicit nsAutoRef(const nsReturningRef<T>& aReturning)
+    : BaseClass(aReturning)
+  {
+  }
+
+  // The only assignment operator provided is for transferring from an
+  // nsReturnRef smart reference, which expects to pass its ownership to
+  // another object.
+  //
+  // With raw references and other smart references, the type of the lhs and
+  // its taking and releasing nature is often not obvious from an assignment
+  // statement.  Assignment from a raw ptr especially is not normally
+  // expected to release the reference.
+  //
+  // Use |steal| for taking ownership from other smart refs.
+  //
+  // For raw references, use |own| to indicate intention to have the
+  // resource released.
+  //
+  // Or, to create another owner of the same reference, use an nsCountedRef.
+
+  ThisClass& operator=(const nsReturningRef<T>& aReturning)
+  {
+    BaseClass::steal(aReturning.mReturnRef);
+    return *this;
+  }
+
+  // Conversion to a raw reference allow the nsAutoRef<T> to often be used
+  // like a raw reference.
+  operator typename SimpleRef::RawRef() const
+  {
+    return this->get();
+  }
+
+  // Transfer ownership from another smart reference.
+  void steal(ThisClass& aOtherRef)
+  {
+    BaseClass::steal(aOtherRef);
+  }
+
+  // Assume ownership of a raw ref.
+  //
+  // |own| has similar function to |steal|, and is useful for receiving
+  // ownership from a return value of a function.  It is named differently
+  // because |own| requires more care to ensure that the function intends to
+  // give away ownership, and so that |steal| can be safely used, knowing
+  // that it won't steal ownership from any methods returning raw ptrs to
+  // data owned by a foreign object.
+  void own(RawRefOnly aRefToRelease)
+  {
+    BaseClass::own(aRefToRelease);
+  }
+
+  // Exchange ownership with |aOther|
+  void swap(ThisClass& aOther)
+  {
+    LocalSimpleRef temp;
+    temp.SimpleRef::operator=(*this);
+    SimpleRef::operator=(aOther);
+    aOther.SimpleRef::operator=(temp);
+  }
+
+  // Release the reference now.
+  void reset()
+  {
+    this->SafeRelease();
+    LocalSimpleRef empty;
+    SimpleRef::operator=(empty);
+  }
+
+  // Pass out the reference for a function return values.
+  nsReturnRef<T> out()
+  {
+    return nsReturnRef<T>(this->disown());
+  }
+
+  // operator->() and disown() are provided by nsAutoRefBase<T>.
+  // The default nsSimpleRef<T> provides get().
+
+private:
+  // No copy constructor
+  explicit nsAutoRef(ThisClass& aRefToSteal);
+};
+
+/**
+ * template <class T> class nsCountedRef
+ *
+ * A class that creates (adds) a new reference to a resource on construction
+ * or assignment and releases on destruction.
+ *
+ * This class is similar to nsAutoRef<T> and inherits its methods, but also
+ * provides copy construction and assignment operators that enable more than
+ * one concurrent reference to the same resource.
+ *
+ * Specialize |nsAutoRefTraits<T>| or |nsSimpleRef<T>| to use this.  This
+ * class assumes that the resource itself counts references and so can only be
+ * used when |T| represents a reference-counting resource.
+ */
+
+template <class T>
+class nsCountedRef : public nsAutoRef<T>
+{
+protected:
+  typedef nsCountedRef<T> ThisClass;
+  typedef nsAutoRef<T> BaseClass;
+  typedef nsSimpleRef<T> SimpleRef;
+  typedef typename BaseClass::RawRef RawRef;
+
+public:
+  nsCountedRef()
+  {
+  }
+
+  // Construction and assignment from a another nsCountedRef
+  // or a raw ref copies and increments the ref count.
+  nsCountedRef(const ThisClass& aRefToCopy)
+  {
+    SimpleRef::operator=(aRefToCopy);
+    SafeAddRef();
+  }
+  ThisClass& operator=(const ThisClass& aRefToCopy)
+  {
+    if (this == &aRefToCopy) {
+      return *this;
+    }
+
+    this->SafeRelease();
+    SimpleRef::operator=(aRefToCopy);
+    SafeAddRef();
+    return *this;
+  }
+
+  // Implicit conversion from another smart ref argument (to a raw ref) is
+  // accepted here because construction and assignment safely creates a new
+  // reference without interfering with the reference to copy.
+  explicit nsCountedRef(RawRef aRefToCopy)
+    : BaseClass(aRefToCopy)
+  {
+    SafeAddRef();
+  }
+  ThisClass& operator=(RawRef aRefToCopy)
+  {
+    this->own(aRefToCopy);
+    SafeAddRef();
+    return *this;
+  }
+
+  // Construction and assignment from an nsReturnRef function return value,
+  // which expects to give up ownership, transfers ownership.
+  explicit nsCountedRef(const nsReturningRef<T>& aReturning)
+    : BaseClass(aReturning)
+  {
+  }
+  ThisClass& operator=(const nsReturningRef<T>& aReturning)
+  {
+    BaseClass::operator=(aReturning);
+    return *this;
+  }
+
+protected:
+  // Increase the reference count if there is a resource.
+  void SafeAddRef()
+  {
+    if (this->HaveResource()) {
+      this->AddRef(this->get());
+    }
+  }
+};
+
+/**
+ * template <class T> class nsReturnRef
+ *
+ * A type for function return values that hold a reference to a resource that
+ * must be released.  See also |nsAutoRef<T>::out()|.
+ */
+
+template <class T>
+class nsReturnRef : public nsAutoRefBase<T>
+{
+protected:
+  typedef nsAutoRefBase<T> BaseClass;
+  typedef typename BaseClass::RawRefOnly RawRefOnly;
+
+public:
+  // For constructing a return value with no resource
+  nsReturnRef()
+  {
+  }
+
+  // For returning a smart reference from a raw reference that must be
+  // released.  Explicit construction is required so as not to risk
+  // unintentionally releasing the resource associated with a raw ref.
+  MOZ_IMPLICIT nsReturnRef(RawRefOnly aRefToRelease)
+    : BaseClass(aRefToRelease)
+  {
+  }
+
+  // Copy construction transfers ownership
+  nsReturnRef(nsReturnRef<T>& aRefToSteal)
+    : BaseClass(aRefToSteal)
+  {
+  }
+
+  MOZ_IMPLICIT nsReturnRef(const nsReturningRef<T>& aReturning)
+    : BaseClass(aReturning)
+  {
+  }
+
+  // Conversion to a temporary (const) object referring to this object so
+  // that the reference may be passed from a function return value
+  // (temporary) to another smart reference.  There is no need to use this
+  // explicitly.  Simply assign a nsReturnRef<T> function return value to a
+  // smart reference.
+  operator nsReturningRef<T>()
+  {
+    return nsReturningRef<T>(*this);
+  }
+
+  // No conversion to RawRef operator is provided on nsReturnRef, to ensure
+  // that the return value is not carelessly assigned to a raw ptr (and the
+  // resource then released).  If passing to a function that takes a raw
+  // ptr, use get or disown as appropriate.
+};
+
+/**
+ * template <class T> class nsReturningRef
+ *
+ * A class to allow ownership to be transferred from nsReturnRef function
+ * return values.
+ *
+ * It should not be necessary for clients to reference this
+ * class directly.  Simply pass an nsReturnRef<T> to a parameter taking an
+ * |nsReturningRef<T>|.
+ *
+ * The conversion operator on nsReturnRef constructs a temporary wrapper of
+ * class nsReturningRef<T> around a non-const reference to the nsReturnRef.
+ * The wrapper can then be passed as an rvalue parameter.
+ */
+
+template <class T>
+class nsReturningRef
+{
+private:
+  friend class nsReturnRef<T>;
+
+  explicit nsReturningRef(nsReturnRef<T>& aReturnRef)
+    : mReturnRef(aReturnRef)
+  {
+  }
+public:
+  nsReturnRef<T>& mReturnRef;
+};
+
+/**
+ * template <class T> class nsAutoRefTraits
+ *
+ * A class describing traits of references managed by the default
+ * |nsSimpleRef<T>| implementation and thus |nsAutoRef<T>| and |nsCountedRef|.
+ * The default |nsSimpleRef<T> is suitable for resources with handles that
+ * have a void value.  (If there is no such void value for a handle,
+ * specialize |nsSimpleRef<T>|.)
+ *
+ * Specializations must be provided for each class |T| according to the
+ * following pattern:
+ *
+ * // The template parameter |T| should be a class such that the set of fields
+ * // in class nsAutoRefTraits<T> is unique for class |T|.  Usually the
+ * // resource object class is sufficient.  For handles that are simple
+ * // integral typedefs, a new unique possibly-incomplete class may need to be
+ * // declared.
+ *
+ * template <>
+ * class nsAutoRefTraits<T>
+ * {
+ *     // Specializations must provide a typedef for RawRef, describing the
+ *     // type of the handle to the resource.
+ *     typedef <handle-type> RawRef;
+ *
+ *     // Specializations should define Void(), a function returning a value
+ *     // suitable for a handle that does not have an associated resource.
+ *     //
+ *     // The return type must be a suitable as the parameter to a RawRef
+ *     // constructor and operator==.
+ *     //
+ *     // If this method is not accessible then some limited nsAutoRef
+ *     // functionality will still be available, but the default constructor,
+ *     // |reset|, and most transfer of ownership methods will not be available.
+ *     static <return-type> Void();
+ *
+ *     // Specializations must define Release() to properly finalize the
+ *     // handle to a non-void custom-deleted or reference-counted resource.
+ *     static void Release(RawRef aRawRef);
+ *
+ *     // For reference-counted resources, if |nsCountedRef<T>| is to be used,
+ *     // specializations must define AddRef to increment the reference count
+ *     // held by a non-void handle.
+ *     // (AddRef() is not necessary for |nsAutoRef<T>|.)
+ *     static void AddRef(RawRef aRawRef);
+ * };
+ *
+ * See nsPointerRefTraits for example specializations for simple pointer
+ * references.  See nsAutoRef for an example specialization for a non-pointer
+ * reference.
+ */
+
+template <class T> class nsAutoRefTraits;
+
+/**
+ * template <class T> class nsPointerRefTraits
+ *
+ * A convenience class useful as a base class for specializations of
+ * |nsAutoRefTraits<T>| where the handle to the resource is a pointer to |T|.
+ * By inheriting from this class, definitions of only Release(RawRef) and
+ * possibly AddRef(RawRef) need to be added.
+ *
+ * Examples of use:
+ *
+ * template <>
+ * class nsAutoRefTraits<PRFileDesc> : public nsPointerRefTraits<PRFileDesc>
+ * {
+ * public:
+ *     static void Release(PRFileDesc *ptr) { PR_Close(ptr); }
+ * };
+ *
+ * template <>
+ * class nsAutoRefTraits<FcPattern> : public nsPointerRefTraits<FcPattern>
+ * {
+ * public:
+ *     static void Release(FcPattern *ptr) { FcPatternDestroy(ptr); }
+ *     static void AddRef(FcPattern *ptr) { FcPatternReference(ptr); }
+ * };
+ */
+
+template <class T>
+class nsPointerRefTraits
+{
+public:
+  // The handle is a pointer to T.
+  typedef T* RawRef;
+  // A nullptr does not have a resource.
+  static RawRef Void()
+  {
+    return nullptr;
+  }
+};
+
+/**
+ * template <class T> class nsSimpleRef
+ *
+ * Constructs a non-smart reference, and provides methods to test whether
+ * there is an associated resource and (if so) get its raw handle.
+ *
+ * A default implementation is suitable for resources with handles that have a
+ * void value.  This is not intended for direct use but used by |nsAutoRef<T>|
+ * and thus |nsCountedRef<T>|.
+ *
+ * Specialize this class if there is no particular void value for the resource
+ * handle.  A specialized implementation must also provide Release(RawRef),
+ * and, if |nsCountedRef<T>| is required, AddRef(RawRef), as described in
+ * nsAutoRefTraits<T>.
+ */
+
+template <class T>
+class nsSimpleRef : protected nsAutoRefTraits<T>
+{
+protected:
+  // The default implementation uses nsAutoRefTrait<T>.
+  // Specializations need not define this typedef.
+  typedef nsAutoRefTraits<T> Traits;
+  // The type of the handle to the resource.
+  // A specialization must provide a typedef for RawRef.
+  typedef typename Traits::RawRef RawRef;
+
+  // Construct with no resource.
+  //
+  // If this constructor is not accessible then some limited nsAutoRef
+  // functionality will still be available, but the default constructor,
+  // |reset|, and most transfer of ownership methods will not be available.
+  nsSimpleRef()
+    : mRawRef(Traits::Void())
+  {
+  }
+  // Construct with a handle to a resource.
+  // A specialization must provide this.
+  explicit nsSimpleRef(RawRef aRawRef)
+    : mRawRef(aRawRef)
+  {
+  }
+
+  // Test whether there is an associated resource.  A specialization must
+  // provide this.  The function is permitted to always return true if the
+  // default constructor is not accessible, or if Release (and AddRef) can
+  // deal with void handles.
+  bool HaveResource() const
+  {
+    return mRawRef != Traits::Void();
+  }
+
+public:
+  // A specialization must provide get() or loose some functionality.  This
+  // is inherited by derived classes and the specialization may choose
+  // whether it is public or protected.
+  RawRef get() const
+  {
+    return mRawRef;
+  }
+
+private:
+  RawRef mRawRef;
+};
+
+
+/**
+ * template <class T> class nsAutoRefBase
+ *
+ * Internal base class for |nsAutoRef<T>| and |nsReturnRef<T>|.
+ * Adds release on destruction to a |nsSimpleRef<T>|.
+ */
+
+template <class T>
+class nsAutoRefBase : public nsSimpleRef<T>
+{
+protected:
+  typedef nsAutoRefBase<T> ThisClass;
+  typedef nsSimpleRef<T> SimpleRef;
+  typedef typename SimpleRef::RawRef RawRef;
+
+  nsAutoRefBase()
+  {
+  }
+
+  // A type for parameters that should be passed a raw ref but should not
+  // accept implicit conversions (from another smart ref).  (The only
+  // conversion to this type is from a raw ref so only raw refs will be
+  // accepted.)
+  class RawRefOnly
+  {
+  public:
+    MOZ_IMPLICIT RawRefOnly(RawRef aRawRef)
+      : mRawRef(aRawRef)
+    {
+    }
+    operator RawRef() const
+    {
+      return mRawRef;
+    }
+  private:
+    RawRef mRawRef;
+  };
+
+  // Construction from a raw ref assumes ownership
+  explicit nsAutoRefBase(RawRefOnly aRefToRelease)
+    : SimpleRef(aRefToRelease)
+  {
+  }
+
+  // Constructors that steal ownership
+  explicit nsAutoRefBase(ThisClass& aRefToSteal)
+    : SimpleRef(aRefToSteal.disown())
+  {
+  }
+  explicit nsAutoRefBase(const nsReturningRef<T>& aReturning)
+    : SimpleRef(aReturning.mReturnRef.disown())
+  {
+  }
+
+  ~nsAutoRefBase()
+  {
+    SafeRelease();
+  }
+
+  // An internal class providing access to protected nsSimpleRef<T>
+  // constructors for construction of temporary simple references (that are
+  // not ThisClass).
+  class LocalSimpleRef : public SimpleRef
+  {
+  public:
+    LocalSimpleRef()
+    {
+    }
+    explicit LocalSimpleRef(RawRef aRawRef)
+      : SimpleRef(aRawRef)
+    {
+    }
+  };
+
+private:
+  ThisClass& operator=(const ThisClass& aSmartRef) = delete;
+
+public:
+  RawRef operator->() const
+  {
+    return this->get();
+  }
+
+  // Transfer ownership to a raw reference.
+  //
+  // THE CALLER MUST ENSURE THAT THE REFERENCE IS EXPLICITLY RELEASED.
+  //
+  // Is this really what you want to use?  Using this removes any guarantee
+  // of release.  Use nsAutoRef<T>::out() for return values, or an
+  // nsAutoRef<T> modifiable lvalue for an out parameter.  Use disown() when
+  // the reference must be stored in a POD type object, such as may be
+  // preferred for a namespace-scope object with static storage duration,
+  // for example.
+  RawRef disown()
+  {
+    RawRef temp = this->get();
+    LocalSimpleRef empty;
+    SimpleRef::operator=(empty);
+    return temp;
+  }
+
+protected:
+  // steal and own are protected because they make no sense on nsReturnRef,
+  // but steal is implemented on this class for access to aOtherRef.disown()
+  // when aOtherRef is an nsReturnRef;
+
+  // Transfer ownership from another smart reference.
+  void steal(ThisClass& aOtherRef)
+  {
+    own(aOtherRef.disown());
+  }
+  // Assume ownership of a raw ref.
+  void own(RawRefOnly aRefToRelease)
+  {
+    SafeRelease();
+    LocalSimpleRef ref(aRefToRelease);
+    SimpleRef::operator=(ref);
+  }
+
+  // Release a resource if there is one.
+  void SafeRelease()
+  {
+    if (this->HaveResource()) {
+      this->Release(this->get());
+    }
+  }
+};
+
+#endif // !defined(nsAutoRef_h_)
diff --git a/onlineupdate/source/update/inc/nsWindowsHelpers.h b/onlineupdate/source/update/inc/nsWindowsHelpers.h
new file mode 100644
index 000000000000..c9284292691a
--- /dev/null
+++ b/onlineupdate/source/update/inc/nsWindowsHelpers.h
@@ -0,0 +1,159 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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 nsWindowsHelpers_h
+#define nsWindowsHelpers_h
+
+#include <windows.h>
+#include "nsAutoRef.h"
+
+// ----------------------------------------------------------------------------
+// Critical Section helper class
+// ----------------------------------------------------------------------------
+
+class AutoCriticalSection
+{
+public:
+  AutoCriticalSection(LPCRITICAL_SECTION aSection)
+    : mSection(aSection)
+  {
+    ::EnterCriticalSection(mSection);
+  }
+  ~AutoCriticalSection()
+  {
+    ::LeaveCriticalSection(mSection);
+  }
+private:
+  LPCRITICAL_SECTION mSection;
+};
+
+template<>
+class nsAutoRefTraits<HKEY>
+{
+public:
+  typedef HKEY RawRef;
+  static HKEY Void()
+  {
+    return nullptr;
+  }
+
+  static void Release(RawRef aFD)
+  {
+    if (aFD != Void()) {
+      RegCloseKey(aFD);
+    }
+  }
+};
+
+template<>
+class nsAutoRefTraits<SC_HANDLE>
+{
+public:
+  typedef SC_HANDLE RawRef;
+  static SC_HANDLE Void()
+  {
+    return nullptr;
+  }
+
+  static void Release(RawRef aFD)
+  {
+    if (aFD != Void()) {
+      CloseServiceHandle(aFD);
+    }
+  }
+};
+
+template<>
+class nsSimpleRef<HANDLE>
+{
+protected:
+  typedef HANDLE RawRef;
+
+  nsSimpleRef() : mRawRef(nullptr)
+  {
+  }
+
+  nsSimpleRef(RawRef aRawRef) : mRawRef(aRawRef)
+  {
+  }
+
+  bool HaveResource() const
+  {
+    return mRawRef && mRawRef != INVALID_HANDLE_VALUE;
+  }
+
+public:
+  RawRef get() const
+  {
+    return mRawRef;
+  }
+
+  static void Release(RawRef aRawRef)
+  {
+    if (aRawRef && aRawRef != INVALID_HANDLE_VALUE) {
+      CloseHandle(aRawRef);
+    }
+  }
+  RawRef mRawRef;
+};
+
+
+template<>
+class nsAutoRefTraits<HMODULE>
+{
+public:
+  typedef HMODULE RawRef;
+  static RawRef Void()
+  {
+    return nullptr;
+  }
+
+  static void Release(RawRef aFD)
+  {
+    if (aFD != Void()) {
+      FreeLibrary(aFD);
+    }
+  }
+};
+
+typedef nsAutoRef<HKEY> nsAutoRegKey;
+typedef nsAutoRef<SC_HANDLE> nsAutoServiceHandle;
+typedef nsAutoRef<HANDLE> nsAutoHandle;
+typedef nsAutoRef<HMODULE> nsModuleHandle;
+
+namespace {
+
+HMODULE inline
+LoadLibrarySystem32(LPCWSTR aModule)
+{
+  WCHAR systemPath[MAX_PATH + 1] = { L'\0' };
+
+  // If GetSystemPath fails we accept that we'll load the DLLs from the
+  // normal search path.
+  GetSystemDirectoryW(systemPath, MAX_PATH + 1);
+  size_t systemDirLen = wcslen(systemPath);
+
+  // Make the system directory path terminate with a slash
+  if (systemDirLen && systemPath[systemDirLen - 1] != L'\\') {
+    systemPath[systemDirLen] = L'\\';
+    ++systemDirLen;
+    // No need to re-nullptr terminate
+  }
+
+  size_t fileLen = wcslen(aModule);
+  wcsncpy(systemPath + systemDirLen, aModule,
+          MAX_PATH - systemDirLen);
+  if (systemDirLen + fileLen <= MAX_PATH) {
+    systemPath[systemDirLen + fileLen] = L'\0';
+  } else {
+    systemPath[MAX_PATH] = L'\0';
+  }
+  return LoadLibraryW(systemPath);
+}
+
+}
+
+#endif