The Tor Browser: gfx/harfbuzz/src/hb-open-type-private.hh@129ffea94266 (annotated)

gfx/harfbuzz/src/hb-open-type-private.hh@129ffea94266 (annotated)

gfx/harfbuzz/src/hb-open-type-private.hh

Sat, 03 Jan 2015 20:18:00 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Sat, 03 Jan 2015 20:18:00 +0100
branch: TOR_BUG_3246
changeset 7: 129ffea94266
permissions: -rw-r--r--

Conditionally enable double key logic according to:
private browsing mode or privacy.thirdparty.isolate preference and
implement in GetCookieStringCommon and FindCookie where it counts...
With some reservations of how to convince FindCookie users to test
condition and pass a nullptr when disabling double key logic.

 /*
  * Copyright © 2007,2008,2009,2010  Red Hat, Inc.
  * Copyright © 2012  Google, Inc.
  *
  *  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.
  *
  * Red Hat Author(s): Behdad Esfahbod
  * Google Author(s): Behdad Esfahbod
  */
 #ifndef HB_OPEN_TYPE_PRIVATE_HH
 #define HB_OPEN_TYPE_PRIVATE_HH
 #include "hb-private.hh"
 namespace OT {
 /*
  * Casts
  */
 /* Cast to struct T, reference to reference */
 template<typename Type, typename TObject>
 inline const Type& CastR(const TObject &X)
 { return reinterpret_cast<const Type&> (X); }
 template<typename Type, typename TObject>
 inline Type& CastR(TObject &X)
 { return reinterpret_cast<Type&> (X); }
 /* Cast to struct T, pointer to pointer */
 template<typename Type, typename TObject>
 inline const Type* CastP(const TObject *X)
 { return reinterpret_cast<const Type*> (X); }
 template<typename Type, typename TObject>
 inline Type* CastP(TObject *X)
 { return reinterpret_cast<Type*> (X); }
 /* StructAtOffset<T>(P,Ofs) returns the struct T& that is placed at memory
  * location pointed to by P plus Ofs bytes. */
 template<typename Type>
 inline const Type& StructAtOffset(const void *P, unsigned int offset)
 { return * reinterpret_cast<const Type*> ((const char *) P + offset); }
 template<typename Type>
 inline Type& StructAtOffset(void *P, unsigned int offset)
 { return * reinterpret_cast<Type*> ((char *) P + offset); }
 /* StructAfter<T>(X) returns the struct T& that is placed after X.
  * Works with X of variable size also.  X must implement get_size() */
 template<typename Type, typename TObject>
 inline const Type& StructAfter(const TObject &X)
 { return StructAtOffset<Type>(&X, X.get_size()); }
 template<typename Type, typename TObject>
 inline Type& StructAfter(TObject &X)
 { return StructAtOffset<Type>(&X, X.get_size()); }
 /*
  * Size checking
  */
 /* Check _assertion in a method environment */
 #define _DEFINE_INSTANCE_ASSERTION1(_line, _assertion) \
   inline void _instance_assertion_on_line_##_line (void) const \
   { \
     ASSERT_STATIC (_assertion); \
     ASSERT_INSTANCE_POD (*this); /* Make sure it's POD. */ \
   }
 # define _DEFINE_INSTANCE_ASSERTION0(_line, _assertion) _DEFINE_INSTANCE_ASSERTION1 (_line, _assertion)
 # define DEFINE_INSTANCE_ASSERTION(_assertion) _DEFINE_INSTANCE_ASSERTION0 (__LINE__, _assertion)
 /* Check that _code compiles in a method environment */
 #define _DEFINE_COMPILES_ASSERTION1(_line, _code) \
   inline void _compiles_assertion_on_line_##_line (void) const \
   { _code; }
 # define _DEFINE_COMPILES_ASSERTION0(_line, _code) _DEFINE_COMPILES_ASSERTION1 (_line, _code)
 # define DEFINE_COMPILES_ASSERTION(_code) _DEFINE_COMPILES_ASSERTION0 (__LINE__, _code)
 #define DEFINE_SIZE_STATIC(size) \
   DEFINE_INSTANCE_ASSERTION (sizeof (*this) == (size)); \
   static const unsigned int static_size = (size); \
   static const unsigned int min_size = (size)
 /* Size signifying variable-sized array */
 #define VAR 1
 #define DEFINE_SIZE_UNION(size, _member) \
   DEFINE_INSTANCE_ASSERTION (this->u._member.static_size == (size)); \
   static const unsigned int min_size = (size)
 #define DEFINE_SIZE_MIN(size) \
   DEFINE_INSTANCE_ASSERTION (sizeof (*this) >= (size)); \
   static const unsigned int min_size = (size)
 #define DEFINE_SIZE_ARRAY(size, array) \
   DEFINE_INSTANCE_ASSERTION (sizeof (*this) == (size) + sizeof (array[0])); \
   DEFINE_COMPILES_ASSERTION ((void) array[0].static_size) \
   static const unsigned int min_size = (size)
 #define DEFINE_SIZE_ARRAY2(size, array1, array2) \
   DEFINE_INSTANCE_ASSERTION (sizeof (*this) == (size) + sizeof (this->array1[0]) + sizeof (this->array2[0])); \
   DEFINE_COMPILES_ASSERTION ((void) array1[0].static_size; (void) array2[0].static_size) \
   static const unsigned int min_size = (size)
 /*
  * Null objects
  */
 /* Global nul-content Null pool.  Enlarge as necessary. */
 /* TODO This really should be a extern HB_INTERNAL and defined somewhere... */
 static const void *_NullPool[64 / sizeof (void *)];
 /* Generic nul-content Null objects. */
 template <typename Type>
 static inline const Type& Null (void) {
   ASSERT_STATIC (sizeof (Type) <= sizeof (_NullPool));
   return *CastP<Type> (_NullPool);
 }
 /* Specializaiton for arbitrary-content arbitrary-sized Null objects. */
 #define DEFINE_NULL_DATA(Type, data) \
 static const char _Null##Type[sizeof (Type) + 1] = data; /* +1 is for nul-termination in data */ \
 template <> \
 inline const Type& Null<Type> (void) { \
   return *CastP<Type> (_Null##Type); \
 } /* The following line really exists such that we end in a place needing semicolon */ \
 ASSERT_STATIC (Type::min_size + 1 <= sizeof (_Null##Type))
 /* Accessor macro. */
 #define Null(Type) Null<Type>()
 /*
  * Sanitize
  */
 #ifndef HB_DEBUG_SANITIZE
 #define HB_DEBUG_SANITIZE (HB_DEBUG+0)
 #endif
 #define TRACE_SANITIZE(this) \
 	hb_auto_trace_t<HB_DEBUG_SANITIZE, bool> trace \
 	(&c->debug_depth, c->get_name (), this, HB_FUNC, \
 	 "");
 /* This limits sanitizing time on really broken fonts. */
 #ifndef HB_SANITIZE_MAX_EDITS
 #define HB_SANITIZE_MAX_EDITS 100
 #endif
 struct hb_sanitize_context_t
 {
   inline const char *get_name (void) { return "SANITIZE"; }
   static const unsigned int max_debug_depth = HB_DEBUG_SANITIZE;
   typedef bool return_t;
   template <typename T>
   inline return_t dispatch (const T &obj) { return obj.sanitize (this); }
   static return_t default_return_value (void) { return true; }
   bool stop_sublookup_iteration (const return_t r HB_UNUSED) const { return false; }
   inline void init (hb_blob_t *b)
   {
     this->blob = hb_blob_reference (b);
     this->writable = false;
   }
   inline void start_processing (void)
   {
     this->start = hb_blob_get_data (this->blob, NULL);
     this->end = this->start + hb_blob_get_length (this->blob);
     this->edit_count = 0;
     this->debug_depth = 0;
     DEBUG_MSG_LEVEL (SANITIZE, this->blob, 0, +1,
 		     "start [%p..%p] (%lu bytes)",
 		     this->start, this->end,
 		     (unsigned long) (this->end - this->start));
   }
   inline void end_processing (void)
   {
     DEBUG_MSG_LEVEL (SANITIZE, this->blob, 0, -1,
 		     "end [%p..%p] %u edit requests",
 		     this->start, this->end, this->edit_count);
     hb_blob_destroy (this->blob);
     this->blob = NULL;
     this->start = this->end = NULL;
   }
   inline bool check_range (const void *base, unsigned int len) const
   {
     const char *p = (const char *) base;
     hb_auto_trace_t<HB_DEBUG_SANITIZE, bool> trace
       (&this->debug_depth, "SANITIZE", this->blob, NULL,
        "check_range [%p..%p] (%d bytes) in [%p..%p]",
        p, p + len, len,
        this->start, this->end);
     return TRACE_RETURN (likely (this->start <= p && p <= this->end && (unsigned int) (this->end - p) >= len));
   }
   inline bool check_array (const void *base, unsigned int record_size, unsigned int len) const
   {
     const char *p = (const char *) base;
     bool overflows = _hb_unsigned_int_mul_overflows (len, record_size);
     hb_auto_trace_t<HB_DEBUG_SANITIZE, bool> trace
       (&this->debug_depth, "SANITIZE", this->blob, NULL,
        "check_array [%p..%p] (%d*%d=%ld bytes) in [%p..%p]",
        p, p + (record_size * len), record_size, len, (unsigned long) record_size * len,
        this->start, this->end);
     return TRACE_RETURN (likely (!overflows && this->check_range (base, record_size * len)));
   }
   template <typename Type>
   inline bool check_struct (const Type *obj) const
   {
     return likely (this->check_range (obj, obj->min_size));
   }
   inline bool may_edit (const void *base HB_UNUSED, unsigned int len HB_UNUSED)
   {
     if (this->edit_count >= HB_SANITIZE_MAX_EDITS)
       return false;
     const char *p = (const char *) base;
     this->edit_count++;
     hb_auto_trace_t<HB_DEBUG_SANITIZE, bool> trace
       (&this->debug_depth, "SANITIZE", this->blob, NULL,
        "may_edit(%u) [%p..%p] (%d bytes) in [%p..%p] -> %s",
        this->edit_count,
        p, p + len, len,
        this->start, this->end,
        this->writable ? "GRANTED" : "DENIED");
     return TRACE_RETURN (this->writable);
   }
   mutable unsigned int debug_depth;
   const char *start, *end;
   bool writable;
   unsigned int edit_count;
   hb_blob_t *blob;
 };
 /* Template to sanitize an object. */
 template <typename Type>
 struct Sanitizer
 {
   static hb_blob_t *sanitize (hb_blob_t *blob) {
     hb_sanitize_context_t c[1] = {{0}};
     bool sane;
     /* TODO is_sane() stuff */
     c->init (blob);
   retry:
     DEBUG_MSG_FUNC (SANITIZE, blob, "start");
     c->start_processing ();
     if (unlikely (!c->start)) {
       c->end_processing ();
       return blob;
     }
     Type *t = CastP<Type> (const_cast<char *> (c->start));
     sane = t->sanitize (c);
     if (sane) {
       if (c->edit_count) {
 	DEBUG_MSG_FUNC (SANITIZE, blob, "passed first round with %d edits; going for second round", c->edit_count);
         /* sanitize again to ensure no toe-stepping */
         c->edit_count = 0;
 	sane = t->sanitize (c);
 	if (c->edit_count) {
 	  DEBUG_MSG_FUNC (SANITIZE, blob, "requested %d edits in second round; FAILLING", c->edit_count);
 	  sane = false;
 	}
       }
     } else {
       unsigned int edit_count = c->edit_count;
       if (edit_count && !c->writable) {
         c->start = hb_blob_get_data_writable (blob, NULL);
 	c->end = c->start + hb_blob_get_length (blob);
 	if (c->start) {
 	  c->writable = true;
 	  /* ok, we made it writable by relocating.  try again */
 	  DEBUG_MSG_FUNC (SANITIZE, blob, "retry");
 	  goto retry;
 	}
       }
     }
     c->end_processing ();
     DEBUG_MSG_FUNC (SANITIZE, blob, sane ? "PASSED" : "FAILED");
     if (sane)
       return blob;
     else {
       hb_blob_destroy (blob);
       return hb_blob_get_empty ();
     }
   }
   static const Type* lock_instance (hb_blob_t *blob) {
     hb_blob_make_immutable (blob);
     const char *base = hb_blob_get_data (blob, NULL);
     return unlikely (!base) ? &Null(Type) : CastP<Type> (base);
   }
 };
 /*
  * Serialize
  */
 #ifndef HB_DEBUG_SERIALIZE
 #define HB_DEBUG_SERIALIZE (HB_DEBUG+0)
 #endif
 #define TRACE_SERIALIZE(this) \
 	hb_auto_trace_t<HB_DEBUG_SERIALIZE, bool> trace \
 	(&c->debug_depth, "SERIALIZE", c, HB_FUNC, \
 	 "");
 struct hb_serialize_context_t
 {
   inline hb_serialize_context_t (void *start, unsigned int size)
   {
     this->start = (char *) start;
     this->end = this->start + size;
     this->ran_out_of_room = false;
     this->head = this->start;
     this->debug_depth = 0;
   }
   template <typename Type>
   inline Type *start_serialize (void)
   {
     DEBUG_MSG_LEVEL (SERIALIZE, this->start, 0, +1,
 		     "start [%p..%p] (%lu bytes)",
 		     this->start, this->end,
 		     (unsigned long) (this->end - this->start));
     return start_embed<Type> ();
   }
   inline void end_serialize (void)
   {
     DEBUG_MSG_LEVEL (SERIALIZE, this->start, 0, -1,
 		     "end [%p..%p] serialized %d bytes; %s",
 		     this->start, this->end,
 		     (int) (this->head - this->start),
 		     this->ran_out_of_room ? "RAN OUT OF ROOM" : "did not ran out of room");
   }
   template <typename Type>
   inline Type *copy (void)
   {
     assert (!this->ran_out_of_room);
     unsigned int len = this->head - this->start;
     void *p = malloc (len);
     if (p)
       memcpy (p, this->start, len);
     return reinterpret_cast<Type *> (p);
   }
   template <typename Type>
   inline Type *allocate_size (unsigned int size)
   {
     if (unlikely (this->ran_out_of_room || this->end - this->head < ptrdiff_t (size))) {
       this->ran_out_of_room = true;
       return NULL;
     }
     memset (this->head, 0, size);
     char *ret = this->head;
     this->head += size;
     return reinterpret_cast<Type *> (ret);
   }
   template <typename Type>
   inline Type *allocate_min (void)
   {
     return this->allocate_size<Type> (Type::min_size);
   }
   template <typename Type>
   inline Type *start_embed (void)
   {
     Type *ret = reinterpret_cast<Type *> (this->head);
     return ret;
   }
   template <typename Type>
   inline Type *embed (const Type &obj)
   {
     unsigned int size = obj.get_size ();
     Type *ret = this->allocate_size<Type> (size);
     if (unlikely (!ret)) return NULL;
     memcpy (ret, obj, size);
     return ret;
   }
   template <typename Type>
   inline Type *extend_min (Type &obj)
   {
     unsigned int size = obj.min_size;
     assert (this->start <= (char *) &obj && (char *) &obj <= this->head && (char *) &obj + size >= this->head);
     if (unlikely (!this->allocate_size<Type> (((char *) &obj) + size - this->head))) return NULL;
     return reinterpret_cast<Type *> (&obj);
   }
   template <typename Type>
   inline Type *extend (Type &obj)
   {
     unsigned int size = obj.get_size ();
     assert (this->start < (char *) &obj && (char *) &obj <= this->head && (char *) &obj + size >= this->head);
     if (unlikely (!this->allocate_size<Type> (((char *) &obj) + size - this->head))) return NULL;
     return reinterpret_cast<Type *> (&obj);
   }
   inline void truncate (void *head)
   {
     assert (this->start < head && head <= this->head);
     this->head = (char *) head;
   }
   unsigned int debug_depth;
   char *start, *end, *head;
   bool ran_out_of_room;
 };
 template <typename Type>
 struct Supplier
 {
   inline Supplier (const Type *array, unsigned int len_)
   {
     head = array;
     len = len_;
   }
   inline const Type operator [] (unsigned int i) const
   {
     if (unlikely (i >= len)) return Type ();
     return head[i];
   }
   inline void advance (unsigned int count)
   {
     if (unlikely (count > len))
       count = len;
     len -= count;
     head += count;
   }
   private:
   inline Supplier (const Supplier<Type> &); /* Disallow copy */
   inline Supplier<Type>& operator= (const Supplier<Type> &); /* Disallow copy */
   unsigned int len;
   const Type *head;
 };
 /*
  *
  * The OpenType Font File: Data Types
  */
 /* "The following data types are used in the OpenType font file.
  *  All OpenType fonts use Motorola-style byte ordering (Big Endian):" */
 /*
  * Int types
  */
 template <typename Type, int Bytes> struct BEInt;
 template <typename Type>
 struct BEInt<Type, 2>
 {
   public:
   inline void set (Type i) { hb_be_uint16_put (v,i); }
   inline operator Type (void) const { return hb_be_uint16_get (v); }
   inline bool operator == (const BEInt<Type, 2>& o) const { return hb_be_uint16_eq (v, o.v); }
   inline bool operator != (const BEInt<Type, 2>& o) const { return !(*this == o); }
   private: uint8_t v[2];
 };
 template <typename Type>
 struct BEInt<Type, 4>
 {
   public:
   inline void set (Type i) { hb_be_uint32_put (v,i); }
   inline operator Type (void) const { return hb_be_uint32_get (v); }
   inline bool operator == (const BEInt<Type, 4>& o) const { return hb_be_uint32_eq (v, o.v); }
   inline bool operator != (const BEInt<Type, 4>& o) const { return !(*this == o); }
   private: uint8_t v[4];
 };
 template <typename Type>
 struct BEInt<Type, 3>
 {
   public:
   inline void set (Type i) { hb_be_uint24_put (v,i); }
   inline operator Type (void) const { return hb_be_uint24_get (v); }
   inline bool operator == (const BEInt<Type, 3>& o) const { return hb_be_uint24_eq (v, o.v); }
   inline bool operator != (const BEInt<Type, 3>& o) const { return !(*this == o); }
   private: uint8_t v[3];
 };
 /* Integer types in big-endian order and no alignment requirement */
 template <typename Type, unsigned int Size>
 struct IntType
 {
   inline void set (Type i) { v.set (i); }
   inline operator Type(void) const { return v; }
   inline bool operator == (const IntType<Type,Size> &o) const { return v == o.v; }
   inline bool operator != (const IntType<Type,Size> &o) const { return v != o.v; }
   static inline int cmp (const IntType<Type,Size> *a, const IntType<Type,Size> *b) { return b->cmp (*a); }
   inline int cmp (IntType<Type,Size> va) const { Type a = va; Type b = v; return a < b ? -1 : a == b ? 0 : +1; }
   inline int cmp (Type a) const { Type b = v; return a < b ? -1 : a == b ? 0 : +1; }
   inline bool sanitize (hb_sanitize_context_t *c) {
     TRACE_SANITIZE (this);
     return TRACE_RETURN (likely (c->check_struct (this)));
   }
   protected:
   BEInt<Type, Size> v;
   public:
   DEFINE_SIZE_STATIC (Size);
 };
 typedef IntType<uint16_t, 2> USHORT;	/* 16-bit unsigned integer. */
 typedef IntType<int16_t,  2> SHORT;	/* 16-bit signed integer. */
 typedef IntType<uint32_t, 4> ULONG;	/* 32-bit unsigned integer. */
 typedef IntType<int32_t,  4> LONG;	/* 32-bit signed integer. */
 typedef IntType<uint32_t, 3> UINT24;	/* 24-bit unsigned integer. */
 /* 16-bit signed integer (SHORT) that describes a quantity in FUnits. */
 typedef SHORT FWORD;
 /* 16-bit unsigned integer (USHORT) that describes a quantity in FUnits. */
 typedef USHORT UFWORD;
 /* Date represented in number of seconds since 12:00 midnight, January 1,
  * 1904. The value is represented as a signed 64-bit integer. */
 struct LONGDATETIME
 {
   inline bool sanitize (hb_sanitize_context_t *c) {
     TRACE_SANITIZE (this);
     return TRACE_RETURN (likely (c->check_struct (this)));
   }
   protected:
   LONG major;
   ULONG minor;
   public:
   DEFINE_SIZE_STATIC (8);
 };
 /* Array of four uint8s (length = 32 bits) used to identify a script, language
  * system, feature, or baseline */
 struct Tag : ULONG
 {
   /* What the char* converters return is NOT nul-terminated.  Print using "%.4s" */
   inline operator const char* (void) const { return reinterpret_cast<const char *> (&this->v); }
   inline operator char* (void) { return reinterpret_cast<char *> (&this->v); }
   public:
   DEFINE_SIZE_STATIC (4);
 };
 DEFINE_NULL_DATA (Tag, "    ");
 /* Glyph index number, same as uint16 (length = 16 bits) */
 typedef USHORT GlyphID;
 /* Script/language-system/feature index */
 struct Index : USHORT {
   static const unsigned int NOT_FOUND_INDEX = 0xFFFF;
 };
 DEFINE_NULL_DATA (Index, "\xff\xff");
 /* Offset to a table, same as uint16 (length = 16 bits), Null offset = 0x0000 */
 struct Offset : USHORT
 {
   inline bool is_null (void) const { return 0 == *this; }
   public:
   DEFINE_SIZE_STATIC (2);
 };
 /* LongOffset to a table, same as uint32 (length = 32 bits), Null offset = 0x00000000 */
 struct LongOffset : ULONG
 {
   inline bool is_null (void) const { return 0 == *this; }
   public:
   DEFINE_SIZE_STATIC (4);
 };
 /* CheckSum */
 struct CheckSum : ULONG
 {
   /* This is reference implementation from the spec. */
   static inline uint32_t CalcTableChecksum (const ULONG *Table, uint32_t Length)
   {
     uint32_t Sum = 0L;
     const ULONG *EndPtr = Table+((Length+3) & ~3) / ULONG::static_size;
     while (Table < EndPtr)
       Sum += *Table++;
     return Sum;
   }
   /* Note: data should be 4byte aligned and have 4byte padding at the end. */
   inline void set_for_data (const void *data, unsigned int length)
   { set (CalcTableChecksum ((const ULONG *) data, length)); }
   public:
   DEFINE_SIZE_STATIC (4);
 };
 /*
  * Version Numbers
  */
 struct FixedVersion
 {
   inline uint32_t to_int (void) const { return (major << 16) + minor; }
   inline bool sanitize (hb_sanitize_context_t *c) {
     TRACE_SANITIZE (this);
     return TRACE_RETURN (c->check_struct (this));
   }
   USHORT major;
   USHORT minor;
   public:
   DEFINE_SIZE_STATIC (4);
 };
 /*
  * Template subclasses of Offset and LongOffset that do the dereferencing.
  * Use: (base+offset)
  */
 template <typename OffsetType, typename Type>
 struct GenericOffsetTo : OffsetType
 {
   inline const Type& operator () (const void *base) const
   {
     unsigned int offset = *this;
     if (unlikely (!offset)) return Null(Type);
     return StructAtOffset<Type> (base, offset);
   }
   inline Type& serialize (hb_serialize_context_t *c, void *base)
   {
     Type *t = c->start_embed<Type> ();
     this->set ((char *) t - (char *) base); /* TODO(serialize) Overflow? */
     return *t;
   }
   inline bool sanitize (hb_sanitize_context_t *c, void *base) {
     TRACE_SANITIZE (this);
     if (unlikely (!c->check_struct (this))) return TRACE_RETURN (false);
     unsigned int offset = *this;
     if (unlikely (!offset)) return TRACE_RETURN (true);
     Type &obj = StructAtOffset<Type> (base, offset);
     return TRACE_RETURN (likely (obj.sanitize (c)) || neuter (c));
   }
   template <typename T>
   inline bool sanitize (hb_sanitize_context_t *c, void *base, T user_data) {
     TRACE_SANITIZE (this);
     if (unlikely (!c->check_struct (this))) return TRACE_RETURN (false);
     unsigned int offset = *this;
     if (unlikely (!offset)) return TRACE_RETURN (true);
     Type &obj = StructAtOffset<Type> (base, offset);
     return TRACE_RETURN (likely (obj.sanitize (c, user_data)) || neuter (c));
   }
   inline bool try_set (hb_sanitize_context_t *c, const OffsetType &v) {
     if (c->may_edit (this, this->static_size)) {
       this->set (v);
       return true;
     }
     return false;
   }
   /* Set the offset to Null */
   inline bool neuter (hb_sanitize_context_t *c) {
     if (c->may_edit (this, this->static_size)) {
       this->set (0); /* 0 is Null offset */
       return true;
     }
     return false;
   }
 };
 template <typename Base, typename OffsetType, typename Type>
 inline const Type& operator + (const Base &base, const GenericOffsetTo<OffsetType, Type> &offset) { return offset (base); }
 template <typename Base, typename OffsetType, typename Type>
 inline Type& operator + (Base &base, GenericOffsetTo<OffsetType, Type> &offset) { return offset (base); }
 template <typename Type>
 struct OffsetTo : GenericOffsetTo<Offset, Type> {};
 template <typename Type>
 struct LongOffsetTo : GenericOffsetTo<LongOffset, Type> {};
 /*
  * Array Types
  */
 template <typename LenType, typename Type>
 struct GenericArrayOf
 {
   const Type *sub_array (unsigned int start_offset, unsigned int *pcount /* IN/OUT */) const
   {
     unsigned int count = len;
     if (unlikely (start_offset > count))
       count = 0;
     else
       count -= start_offset;
     count = MIN (count, *pcount);
     *pcount = count;
     return array + start_offset;
   }
   inline const Type& operator [] (unsigned int i) const
   {
     if (unlikely (i >= len)) return Null(Type);
     return array[i];
   }
   inline Type& operator [] (unsigned int i)
   {
     return array[i];
   }
   inline unsigned int get_size (void) const
   { return len.static_size + len * Type::static_size; }
   inline bool serialize (hb_serialize_context_t *c,
 			 unsigned int items_len)
   {
     TRACE_SERIALIZE (this);
     if (unlikely (!c->extend_min (*this))) return TRACE_RETURN (false);
     len.set (items_len); /* TODO(serialize) Overflow? */
     if (unlikely (!c->extend (*this))) return TRACE_RETURN (false);
     return TRACE_RETURN (true);
   }
   inline bool serialize (hb_serialize_context_t *c,
 			 Supplier<Type> &items,
 			 unsigned int items_len)
   {
     TRACE_SERIALIZE (this);
     if (unlikely (!serialize (c, items_len))) return TRACE_RETURN (false);
     for (unsigned int i = 0; i < items_len; i++)
       array[i] = items[i];
     items.advance (items_len);
     return TRACE_RETURN (true);
   }
   inline bool sanitize (hb_sanitize_context_t *c) {
     TRACE_SANITIZE (this);
     if (unlikely (!sanitize_shallow (c))) return TRACE_RETURN (false);
     /* Note: for structs that do not reference other structs,
      * we do not need to call their sanitize() as we already did
      * a bound check on the aggregate array size.  We just include
      * a small unreachable expression to make sure the structs
      * pointed to do have a simple sanitize(), ie. they do not
      * reference other structs via offsets.
      */
     (void) (false && array[0].sanitize (c));
     return TRACE_RETURN (true);
   }
   inline bool sanitize (hb_sanitize_context_t *c, void *base) {
     TRACE_SANITIZE (this);
     if (unlikely (!sanitize_shallow (c))) return TRACE_RETURN (false);
     unsigned int count = len;
     for (unsigned int i = 0; i < count; i++)
       if (unlikely (!array[i].sanitize (c, base)))
         return TRACE_RETURN (false);
     return TRACE_RETURN (true);
   }
   template <typename T>
   inline bool sanitize (hb_sanitize_context_t *c, void *base, T user_data) {
     TRACE_SANITIZE (this);
     if (unlikely (!sanitize_shallow (c))) return TRACE_RETURN (false);
     unsigned int count = len;
     for (unsigned int i = 0; i < count; i++)
       if (unlikely (!array[i].sanitize (c, base, user_data)))
         return TRACE_RETURN (false);
     return TRACE_RETURN (true);
   }
   private:
   inline bool sanitize_shallow (hb_sanitize_context_t *c) {
     TRACE_SANITIZE (this);
     return TRACE_RETURN (c->check_struct (this) && c->check_array (this, Type::static_size, len));
   }
   public:
   LenType len;
   Type array[VAR];
   public:
   DEFINE_SIZE_ARRAY (sizeof (LenType), array);
 };
 /* An array with a USHORT number of elements. */
 template <typename Type>
 struct ArrayOf : GenericArrayOf<USHORT, Type> {};
 /* An array with a ULONG number of elements. */
 template <typename Type>
 struct LongArrayOf : GenericArrayOf<ULONG, Type> {};
 /* Array of Offset's */
 template <typename Type>
 struct OffsetArrayOf : ArrayOf<OffsetTo<Type> > {};
 /* Array of LongOffset's */
 template <typename Type>
 struct LongOffsetArrayOf : ArrayOf<LongOffsetTo<Type> > {};
 /* LongArray of LongOffset's */
 template <typename Type>
 struct LongOffsetLongArrayOf : LongArrayOf<LongOffsetTo<Type> > {};
 /* Array of offsets relative to the beginning of the array itself. */
 template <typename Type>
 struct OffsetListOf : OffsetArrayOf<Type>
 {
   inline const Type& operator [] (unsigned int i) const
   {
     if (unlikely (i >= this->len)) return Null(Type);
     return this+this->array[i];
   }
   inline bool sanitize (hb_sanitize_context_t *c) {
     TRACE_SANITIZE (this);
     return TRACE_RETURN (OffsetArrayOf<Type>::sanitize (c, this));
   }
   template <typename T>
   inline bool sanitize (hb_sanitize_context_t *c, T user_data) {
     TRACE_SANITIZE (this);
     return TRACE_RETURN (OffsetArrayOf<Type>::sanitize (c, this, user_data));
   }
 };
 /* An array with a USHORT number of elements,
  * starting at second element. */
 template <typename Type>
 struct HeadlessArrayOf
 {
   inline const Type& operator [] (unsigned int i) const
   {
     if (unlikely (i >= len || !i)) return Null(Type);
     return array[i-1];
   }
   inline unsigned int get_size (void) const
   { return len.static_size + (len ? len - 1 : 0) * Type::static_size; }
   inline bool serialize (hb_serialize_context_t *c,
 			 Supplier<Type> &items,
 			 unsigned int items_len)
   {
     TRACE_SERIALIZE (this);
     if (unlikely (!c->extend_min (*this))) return TRACE_RETURN (false);
     len.set (items_len); /* TODO(serialize) Overflow? */
     if (unlikely (!items_len)) return TRACE_RETURN (true);
     if (unlikely (!c->extend (*this))) return TRACE_RETURN (false);
     for (unsigned int i = 0; i < items_len - 1; i++)
       array[i] = items[i];
     items.advance (items_len - 1);
     return TRACE_RETURN (true);
   }
   inline bool sanitize_shallow (hb_sanitize_context_t *c) {
     return c->check_struct (this)
 	&& c->check_array (this, Type::static_size, len);
   }
   inline bool sanitize (hb_sanitize_context_t *c) {
     TRACE_SANITIZE (this);
     if (unlikely (!sanitize_shallow (c))) return TRACE_RETURN (false);
     /* Note: for structs that do not reference other structs,
      * we do not need to call their sanitize() as we already did
      * a bound check on the aggregate array size.  We just include
      * a small unreachable expression to make sure the structs
      * pointed to do have a simple sanitize(), ie. they do not
      * reference other structs via offsets.
      */
     (void) (false && array[0].sanitize (c));
     return TRACE_RETURN (true);
   }
   USHORT len;
   Type array[VAR];
   public:
   DEFINE_SIZE_ARRAY (sizeof (USHORT), array);
 };
 /* An array with sorted elements.  Supports binary searching. */
 template <typename Type>
 struct SortedArrayOf : ArrayOf<Type> {
   template <typename SearchType>
   inline int search (const SearchType &x) const
   {
     /* Hand-coded bsearch here since this is in the hot inner loop. */
     int min = 0, max = (int) this->len - 1;
     while (min <= max)
     {
       int mid = (min + max) / 2;
       int c = this->array[mid].cmp (x);
       if (c < 0)
         max = mid - 1;
       else if (c > 0)
         min = mid + 1;
       else
         return mid;
     }
     return -1;
   }
 };
 } /* namespace OT */
 #endif /* HB_OPEN_TYPE_PRIVATE_HH */

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