--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/harfbuzz/src/hb-bit-set-invertible.hh	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,373 @@
+/*
+ * Copyright © 2012,2017  Google, Inc.
+ * Copyright © 2021 Behdad Esfahbod
+ *
+ *  This is part of HarfBuzz, a text shaping library.
+ *
+ * Permission is hereby granted, without written agreement and without
+ * license or royalty fees, to use, copy, modify, and distribute this
+ * software and its documentation for any purpose, provided that the
+ * above copyright notice and the following two paragraphs appear in
+ * all copies of this software.
+ *
+ * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
+ * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
+ * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
+ * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ *
+ * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
+ * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
+ * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
+ * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+ *
+ * Google Author(s): Behdad Esfahbod
+ */
+
+#ifndef HB_BIT_SET_INVERTIBLE_HH
+#define HB_BIT_SET_INVERTIBLE_HH
+
+#include "hb.hh"
+#include "hb-bit-set.hh"
+
+
+struct hb_bit_set_invertible_t
+{
+  hb_bit_set_t s;
+  bool inverted = false;
+
+  hb_bit_set_invertible_t () = default;
+  hb_bit_set_invertible_t (const hb_bit_set_invertible_t& o) = default;
+  hb_bit_set_invertible_t (hb_bit_set_invertible_t&& other) : hb_bit_set_invertible_t () { hb_swap (*this, other); }
+  hb_bit_set_invertible_t& operator= (const hb_bit_set_invertible_t& o) = default;
+  hb_bit_set_invertible_t& operator= (hb_bit_set_invertible_t&& other) { hb_swap (*this, other); return *this; }
+  friend void swap (hb_bit_set_invertible_t &a, hb_bit_set_invertible_t &b)
+  {
+    if (likely (!a.s.successful || !b.s.successful))
+      return;
+    hb_swap (a.inverted, b.inverted);
+    hb_swap (a.s, b.s);
+  }
+
+  void init () { s.init (); inverted = false; }
+  void fini () { s.fini (); }
+  void err () { s.err (); }
+  bool in_error () const { return s.in_error (); }
+  explicit operator bool () const { return !is_empty (); }
+
+  void alloc (unsigned sz) { s.alloc (sz); }
+  void reset ()
+  {
+    s.reset ();
+    inverted = false;
+  }
+  void clear ()
+  {
+    s.clear ();
+    if (likely (s.successful))
+      inverted = false;
+  }
+  void invert ()
+  {
+    if (likely (s.successful))
+      inverted = !inverted;
+  }
+
+  bool is_empty () const
+  {
+    hb_codepoint_t v = INVALID;
+    next (&v);
+    return v == INVALID;
+  }
+  uint32_t hash () const { return s.hash () ^ (uint32_t) inverted; }
+
+  hb_codepoint_t get_min () const
+  {
+    hb_codepoint_t v = INVALID;
+    next (&v);
+    return v;
+  }
+  hb_codepoint_t get_max () const
+  {
+    hb_codepoint_t v = INVALID;
+    previous (&v);
+    return v;
+  }
+  unsigned int get_population () const
+  { return inverted ? INVALID - s.get_population () : s.get_population (); }
+
+
+  void add (hb_codepoint_t g) { unlikely (inverted) ? s.del (g) : s.add (g); }
+  bool add_range (hb_codepoint_t a, hb_codepoint_t b)
+  { return unlikely (inverted) ? ((void) s.del_range (a, b), true) : s.add_range (a, b); }
+
+  template <typename T>
+  void add_array (const T *array, unsigned int count, unsigned int stride=sizeof(T))
+  { inverted ? s.del_array (array, count, stride) : s.add_array (array, count, stride); }
+  template <typename T>
+  void add_array (const hb_array_t<const T>& arr) { add_array (&arr, arr.len ()); }
+
+  /* Might return false if array looks unsorted.
+   * Used for faster rejection of corrupt data. */
+  template <typename T>
+  bool add_sorted_array (const T *array, unsigned int count, unsigned int stride=sizeof(T))
+  { return inverted ? s.del_sorted_array (array, count, stride) : s.add_sorted_array (array, count, stride); }
+  template <typename T>
+  bool add_sorted_array (const hb_sorted_array_t<const T>& arr) { return add_sorted_array (&arr, arr.len ()); }
+
+  void del (hb_codepoint_t g) { unlikely (inverted) ? s.add (g) : s.del (g); }
+  void del_range (hb_codepoint_t a, hb_codepoint_t b)
+  { unlikely (inverted) ? (void) s.add_range (a, b) : s.del_range (a, b); }
+
+  bool get (hb_codepoint_t g) const { return s.get (g) ^ inverted; }
+
+  /* Has interface. */
+  bool operator [] (hb_codepoint_t k) const { return get (k); }
+  bool has (hb_codepoint_t k) const { return (*this)[k]; }
+  /* Predicate. */
+  bool operator () (hb_codepoint_t k) const { return has (k); }
+
+  /* Sink interface. */
+  hb_bit_set_invertible_t& operator << (hb_codepoint_t v)
+  { add (v); return *this; }
+  hb_bit_set_invertible_t& operator << (const hb_pair_t<hb_codepoint_t, hb_codepoint_t>& range)
+  { add_range (range.first, range.second); return *this; }
+
+  bool intersects (hb_codepoint_t first, hb_codepoint_t last) const
+  {
+    hb_codepoint_t c = first - 1;
+    return next (&c) && c <= last;
+  }
+
+  void set (const hb_bit_set_invertible_t &other)
+  {
+    s.set (other.s);
+    if (likely (s.successful))
+      inverted = other.inverted;
+  }
+
+  bool is_equal (const hb_bit_set_invertible_t &other) const
+  {
+    if (likely (inverted == other.inverted))
+      return s.is_equal (other.s);
+    else
+    {
+      /* TODO Add iter_ranges() and use here. */
+      auto it1 = iter ();
+      auto it2 = other.iter ();
+      return hb_all (+ hb_zip (it1, it2)
+		     | hb_map ([](hb_pair_t<hb_codepoint_t, hb_codepoint_t> _) { return _.first == _.second; }));
+    }
+  }
+
+  bool is_subset (const hb_bit_set_invertible_t &larger_set) const
+  {
+    if (unlikely (inverted != larger_set.inverted))
+      return hb_all (hb_iter (s) | hb_map (larger_set.s));
+    else
+      return unlikely (inverted) ? larger_set.s.is_subset (s) : s.is_subset (larger_set.s);
+  }
+
+  protected:
+  template <typename Op>
+  void process (const Op& op, const hb_bit_set_invertible_t &other)
+  { s.process (op, other.s); }
+  public:
+  void union_ (const hb_bit_set_invertible_t &other)
+  {
+    if (likely (inverted == other.inverted))
+    {
+      if (unlikely (inverted))
+	process (hb_bitwise_and, other);
+      else
+	process (hb_bitwise_or, other); /* Main branch. */
+    }
+    else
+    {
+      if (unlikely (inverted))
+	process (hb_bitwise_gt, other);
+      else
+	process (hb_bitwise_lt, other);
+    }
+    if (likely (s.successful))
+      inverted = inverted || other.inverted;
+  }
+  void intersect (const hb_bit_set_invertible_t &other)
+  {
+    if (likely (inverted == other.inverted))
+    {
+      if (unlikely (inverted))
+	process (hb_bitwise_or, other);
+      else
+	process (hb_bitwise_and, other); /* Main branch. */
+    }
+    else
+    {
+      if (unlikely (inverted))
+	process (hb_bitwise_lt, other);
+      else
+	process (hb_bitwise_gt, other);
+    }
+    if (likely (s.successful))
+      inverted = inverted && other.inverted;
+  }
+  void subtract (const hb_bit_set_invertible_t &other)
+  {
+    if (likely (inverted == other.inverted))
+    {
+      if (unlikely (inverted))
+	process (hb_bitwise_lt, other);
+      else
+	process (hb_bitwise_gt, other); /* Main branch. */
+    }
+    else
+    {
+      if (unlikely (inverted))
+	process (hb_bitwise_or, other);
+      else
+	process (hb_bitwise_and, other);
+    }
+    if (likely (s.successful))
+      inverted = inverted && !other.inverted;
+  }
+  void symmetric_difference (const hb_bit_set_invertible_t &other)
+  {
+    process (hb_bitwise_xor, other);
+    if (likely (s.successful))
+      inverted = inverted ^ other.inverted;
+  }
+
+  bool next (hb_codepoint_t *codepoint) const
+  {
+    if (likely (!inverted))
+      return s.next (codepoint);
+
+    auto old = *codepoint;
+    if (unlikely (old + 1 == INVALID))
+    {
+      *codepoint = INVALID;
+      return false;
+    }
+
+    auto v = old;
+    s.next (&v);
+    if (old + 1 < v)
+    {
+      *codepoint = old + 1;
+      return true;
+    }
+
+    v = old;
+    s.next_range (&old, &v);
+
+    *codepoint = v + 1;
+    return *codepoint != INVALID;
+  }
+  bool previous (hb_codepoint_t *codepoint) const
+  {
+    if (likely (!inverted))
+      return s.previous (codepoint);
+
+    auto old = *codepoint;
+    if (unlikely (old - 1 == INVALID))
+    {
+      *codepoint = INVALID;
+      return false;
+    }
+
+    auto v = old;
+    s.previous (&v);
+
+    if (old - 1 > v || v == INVALID)
+    {
+      *codepoint = old - 1;
+      return true;
+    }
+
+    v = old;
+    s.previous_range (&v, &old);
+
+    *codepoint = v - 1;
+    return *codepoint != INVALID;
+  }
+  bool next_range (hb_codepoint_t *first, hb_codepoint_t *last) const
+  {
+    if (likely (!inverted))
+      return s.next_range (first, last);
+
+    if (!next (last))
+    {
+      *last = *first = INVALID;
+      return false;
+    }
+
+    *first = *last;
+    s.next (last);
+    --*last;
+    return true;
+  }
+  bool previous_range (hb_codepoint_t *first, hb_codepoint_t *last) const
+  {
+    if (likely (!inverted))
+      return s.previous_range (first, last);
+
+    if (!previous (first))
+    {
+      *last = *first = INVALID;
+      return false;
+    }
+
+    *last = *first;
+    s.previous (first);
+    ++*first;
+    return true;
+  }
+
+  unsigned int next_many (hb_codepoint_t  codepoint,
+			  hb_codepoint_t *out,
+			  unsigned int    size) const
+  {
+    return inverted ? s.next_many_inverted (codepoint, out, size)
+		    : s.next_many (codepoint, out, size);
+  }
+
+  static constexpr hb_codepoint_t INVALID = hb_bit_set_t::INVALID;
+
+  /*
+   * Iterator implementation.
+   */
+  struct iter_t : hb_iter_with_fallback_t<iter_t, hb_codepoint_t>
+  {
+    static constexpr bool is_sorted_iterator = true;
+    iter_t (const hb_bit_set_invertible_t &s_ = Null (hb_bit_set_invertible_t),
+	    bool init = true) : s (&s_), v (INVALID), l(0)
+    {
+      if (init)
+      {
+	l = s->get_population () + 1;
+	__next__ ();
+      }
+    }
+
+    typedef hb_codepoint_t __item_t__;
+    hb_codepoint_t __item__ () const { return v; }
+    bool __more__ () const { return v != INVALID; }
+    void __next__ () { s->next (&v); if (l) l--; }
+    void __prev__ () { s->previous (&v); }
+    unsigned __len__ () const { return l; }
+    iter_t end () const { return iter_t (*s, false); }
+    bool operator != (const iter_t& o) const
+    { return s != o.s || v != o.v; }
+
+    protected:
+    const hb_bit_set_invertible_t *s;
+    hb_codepoint_t v;
+    unsigned l;
+  };
+  iter_t iter () const { return iter_t (*this); }
+  operator iter_t () const { return iter (); }
+};
+
+
+#endif /* HB_BIT_SET_INVERTIBLE_HH */