#define HB_OPEN_TYPE_PRIVATE_HH
#include "hb-private.hh"
-
-#include "hb-blob.h"
+#include "hb-debug.hh"
+#include "hb-blob-private.hh"
+#include "hb-face-private.hh"
namespace OT {
/* Cast to struct T, reference to reference */
template<typename Type, typename TObject>
-inline const Type& CastR(const TObject &X)
+static inline const Type& CastR(const TObject &X)
{ return reinterpret_cast<const Type&> (X); }
template<typename Type, typename TObject>
-inline Type& CastR(TObject &X)
+static 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)
+static inline const Type* CastP(const TObject *X)
{ return reinterpret_cast<const Type*> (X); }
template<typename Type, typename TObject>
-inline Type* CastP(TObject *X)
+static 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)
+static 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)
+static 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)
+static inline const Type& StructAfter(const TObject &X)
{ return StructAtOffset<Type>(&X, X.get_size()); }
template<typename Type, typename TObject>
-inline Type& StructAfter(TObject &X)
+static inline Type& StructAfter(TObject &X)
{ return StructAtOffset<Type>(&X, X.get_size()); }
#define _DEFINE_INSTANCE_ASSERTION1(_line, _assertion) \
inline void _instance_assertion_on_line_##_line (void) const \
{ \
- ASSERT_STATIC (_assertion); \
+ static_assert ((_assertion), ""); \
ASSERT_INSTANCE_POD (*this); /* Make sure it's POD. */ \
}
# define _DEFINE_INSTANCE_ASSERTION0(_line, _assertion) _DEFINE_INSTANCE_ASSERTION1 (_line, _assertion)
#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
+ static const unsigned int min_size = (size); \
+ inline unsigned int get_size (void) const { return (size); }
#define DEFINE_SIZE_UNION(size, _member) \
- DEFINE_INSTANCE_ASSERTION (this->u._member.static_size == (size)); \
+ DEFINE_INSTANCE_ASSERTION (0*sizeof(this->u._member.static_size) + sizeof(this->u._member) == (size)); \
static const unsigned int min_size = (size)
#define DEFINE_SIZE_MIN(size) \
/*
- * Null objects
+ * Dispatch
*/
-/* 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>()
-
+template <typename Context, typename Return, unsigned int MaxDebugDepth>
+struct hb_dispatch_context_t
+{
+ static const unsigned int max_debug_depth = MaxDebugDepth;
+ typedef Return return_t;
+ template <typename T, typename F>
+ inline bool may_dispatch (const T *obj, const F *format) { return true; }
+ static return_t no_dispatch_return_value (void) { return Context::default_return_value (); }
+};
/*
* Sanitize
*/
-#ifndef HB_DEBUG_SANITIZE
-#define HB_DEBUG_SANITIZE (HB_DEBUG+0)
+/* This limits sanitizing time on really broken fonts. */
+#ifndef HB_SANITIZE_MAX_EDITS
+#define HB_SANITIZE_MAX_EDITS 32
+#endif
+#ifndef HB_SANITIZE_MAX_OPS_FACTOR
+#define HB_SANITIZE_MAX_OPS_FACTOR 8
+#endif
+#ifndef HB_SANITIZE_MAX_OPS_MIN
+#define HB_SANITIZE_MAX_OPS_MIN 16384
#endif
-
-#define TRACE_SANITIZE(this) \
- hb_auto_trace_t<HB_DEBUG_SANITIZE, bool> trace \
- (&c->debug_depth, c->get_name (), this, HB_FUNC, \
- "");
-
-
-struct hb_sanitize_context_t
+struct hb_sanitize_context_t :
+ hb_dispatch_context_t<hb_sanitize_context_t, bool, HB_DEBUG_SANITIZE>
{
+ inline hb_sanitize_context_t (void) :
+ debug_depth (0),
+ start (nullptr), end (nullptr),
+ writable (false), edit_count (0), max_ops (0),
+ blob (nullptr),
+ num_glyphs (0) {}
+
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, typename F>
+ inline bool may_dispatch (const T *obj, const F *format)
+ { return format->sanitize (this); }
template <typename T>
- inline return_t process (const T &obj) { return obj.sanitize (this); }
+ 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; }
+ static return_t no_dispatch_return_value (void) { return false; }
+ bool stop_sublookup_iteration (const return_t r) const { return !r; }
inline void init (hb_blob_t *b)
{
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->start = hb_blob_get_data (this->blob, nullptr);
+ this->end = this->start + this->blob->length;
+ assert (this->start <= this->end); /* Must not overflow. */
+ this->max_ops = MAX ((unsigned int) (this->end - this->start) * HB_SANITIZE_MAX_OPS_FACTOR,
+ (unsigned) HB_SANITIZE_MAX_OPS_MIN);
this->edit_count = 0;
this->debug_depth = 0;
- DEBUG_MSG_LEVEL (SANITIZE, this->blob, 0, +1,
+ DEBUG_MSG_LEVEL (SANITIZE, start, 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,
+ DEBUG_MSG_LEVEL (SANITIZE, this->start, 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;
+ this->blob = nullptr;
+ this->start = this->end = nullptr;
}
inline bool check_range (const void *base, unsigned int len) const
{
const char *p = (const char *) base;
+ bool ok = this->max_ops-- > 0 &&
+ this->start <= p &&
+ p <= this->end &&
+ (unsigned int) (this->end - p) >= len;
- 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]",
+ DEBUG_MSG_LEVEL (SANITIZE, p, this->debug_depth+1, 0,
+ "check_range [%p..%p] (%d bytes) in [%p..%p] -> %s",
p, p + len, len,
- this->start, this->end);
+ this->start, this->end,
+ ok ? "OK" : "OUT-OF-RANGE");
- return TRACE_RETURN (likely (this->start <= p && p <= this->end && (unsigned int) (this->end - p) >= len));
+ return likely (ok);
}
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);
+ unsigned int array_size = record_size * len;
+ bool ok = !overflows && this->check_range (base, array_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);
+ DEBUG_MSG_LEVEL (SANITIZE, p, this->debug_depth+1, 0,
+ "check_array [%p..%p] (%d*%d=%d bytes) in [%p..%p] -> %s",
+ p, p + (record_size * len), record_size, len, (unsigned int) array_size,
+ this->start, this->end,
+ overflows ? "OVERFLOWS" : ok ? "OK" : "OUT-OF-RANGE");
- return TRACE_RETURN (likely (!overflows && this->check_range (base, record_size * len)));
+ return likely (ok);
}
template <typename Type>
return likely (this->check_range (obj, obj->min_size));
}
- inline bool may_edit (const void *base HB_UNUSED, unsigned int len HB_UNUSED)
+ inline bool may_edit (const void *base, unsigned int len)
{
+ 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,
+ DEBUG_MSG_LEVEL (SANITIZE, p, this->debug_depth+1, 0,
"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);
+ return this->writable;
+ }
+
+ template <typename Type, typename ValueType>
+ inline bool try_set (const Type *obj, const ValueType &v) {
+ if (this->may_edit (obj, obj->static_size)) {
+ const_cast<Type *> (obj)->set (v);
+ return true;
+ }
+ return false;
}
mutable unsigned int debug_depth;
const char *start, *end;
bool writable;
unsigned int edit_count;
+ mutable int max_ops;
hb_blob_t *blob;
+ unsigned int num_glyphs;
};
template <typename Type>
struct Sanitizer
{
- static hb_blob_t *sanitize (hb_blob_t *blob) {
- hb_sanitize_context_t c[1] = {{0}};
+ inline Sanitizer (void) {}
+
+ inline hb_blob_t *sanitize (hb_blob_t *blob) {
bool sane;
/* TODO is_sane() stuff */
c->init (blob);
retry:
- DEBUG_MSG_FUNC (SANITIZE, blob, "start");
+ DEBUG_MSG_FUNC (SANITIZE, c->start, "start");
c->start_processing ();
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);
+ DEBUG_MSG_FUNC (SANITIZE, c->start, "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);
+ DEBUG_MSG_FUNC (SANITIZE, c->start, "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);
+ c->start = hb_blob_get_data_writable (blob, nullptr);
+ c->end = c->start + blob->length;
if (c->start) {
c->writable = true;
/* ok, we made it writable by relocating. try again */
- DEBUG_MSG_FUNC (SANITIZE, blob, "retry");
+ DEBUG_MSG_FUNC (SANITIZE, c->start, "retry");
goto retry;
}
}
c->end_processing ();
- DEBUG_MSG_FUNC (SANITIZE, blob, sane ? "PASSED" : "FAILED");
+ DEBUG_MSG_FUNC (SANITIZE, c->start, sane ? "PASSED" : "FAILED");
if (sane)
+ {
+ blob->lock ();
return blob;
- else {
+ }
+ 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);
- }
+ inline void set_num_glyphs (unsigned int num_glyphs) { c->num_glyphs = num_glyphs; }
+
+ private:
+ hb_sanitize_context_t c[1];
};
* 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)
+ inline hb_serialize_context_t (void *start_, unsigned int size)
{
- this->start = (char *) start;
+ this->start = (char *) start_;
this->end = this->start + size;
this->ran_out_of_room = false;
template <typename Type>
inline Type *allocate_size (unsigned int size)
{
- if (unlikely (this->ran_out_of_room || this->end - this->head < size)) {
+ if (unlikely (this->ran_out_of_room || this->end - this->head < ptrdiff_t (size))) {
this->ran_out_of_room = true;
- return NULL;
+ return nullptr;
}
memset (this->head, 0, size);
char *ret = this->head;
{
unsigned int size = obj.get_size ();
Type *ret = this->allocate_size<Type> (size);
- if (unlikely (!ret)) return NULL;
+ if (unlikely (!ret)) return nullptr;
memcpy (ret, obj, size);
return ret;
}
{
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;
+ if (unlikely (!this->allocate_size<Type> (((char *) &obj) + size - this->head))) return nullptr;
return reinterpret_cast<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;
+ if (unlikely (!this->allocate_size<Type> (((char *) &obj) + size - this->head))) return nullptr;
return reinterpret_cast<Type *> (&obj);
}
- inline void truncate (void *head)
+ inline void truncate (void *new_head)
{
- assert (this->start < head && head <= this->head);
- this->head = (char *) head;
+ assert (this->start < new_head && new_head <= this->head);
+ this->head = (char *) new_head;
}
unsigned int debug_depth;
template <typename Type>
struct Supplier
{
- inline Supplier (const Type *array, unsigned int len_)
+ inline Supplier (const Type *array, unsigned int len_, unsigned int stride_=sizeof(Type))
{
head = array;
len = len_;
+ stride = stride_;
}
inline const Type operator [] (unsigned int i) const
{
if (unlikely (i >= len)) return Type ();
- return head[i];
+ return * (const Type *) (const void *) ((const char *) head + stride * i);
}
- inline void advance (unsigned int count)
+ inline Supplier<Type> & operator += (unsigned int count)
{
if (unlikely (count > len))
count = len;
len -= count;
- head += count;
+ head = (const Type *) (const void *) ((const char *) head + stride * count);
+ return *this;
}
private:
inline Supplier<Type>& operator= (const Supplier<Type> &); /* Disallow copy */
unsigned int len;
+ unsigned int stride;
const Type *head;
};
-
-
/*
*
* The OpenType Font File: Data Types
template <typename Type, int Bytes> struct BEInt;
template <typename Type>
-struct BEInt<Type, 2>
+struct BEInt<Type, 1>
{
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];
+ inline void set (Type V)
+ {
+ v = V;
+ }
+ inline operator Type (void) const
+ {
+ return v;
+ }
+ private: uint8_t v;
};
template <typename Type>
-struct BEInt<Type, 4>
+struct BEInt<Type, 2>
{
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];
+ inline void set (Type V)
+ {
+ v[0] = (V >> 8) & 0xFF;
+ v[1] = (V ) & 0xFF;
+ }
+ inline operator Type (void) const
+ {
+ return (v[0] << 8)
+ + (v[1] );
+ }
+ private: uint8_t v[2];
};
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); }
+ inline void set (Type V)
+ {
+ v[0] = (V >> 16) & 0xFF;
+ v[1] = (V >> 8) & 0xFF;
+ v[2] = (V ) & 0xFF;
+ }
+ inline operator Type (void) const
+ {
+ return (v[0] << 16)
+ + (v[1] << 8)
+ + (v[2] );
+ }
private: uint8_t v[3];
};
+template <typename Type>
+struct BEInt<Type, 4>
+{
+ public:
+ inline void set (Type V)
+ {
+ v[0] = (V >> 24) & 0xFF;
+ v[1] = (V >> 16) & 0xFF;
+ v[2] = (V >> 8) & 0xFF;
+ v[3] = (V ) & 0xFF;
+ }
+ inline operator Type (void) const
+ {
+ return (v[0] << 24)
+ + (v[1] << 16)
+ + (v[2] << 8)
+ + (v[3] );
+ }
+ private: uint8_t v[4];
+};
/* Integer types in big-endian order and no alignment requirement */
template <typename Type, unsigned int Size>
{
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; }
+ inline bool operator == (const IntType<Type,Size> &o) const { return (Type) v == (Type) o.v; }
+ inline bool operator != (const IntType<Type,Size> &o) const { return !(*this == o); }
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) {
+ template <typename Type2>
+ inline int cmp (Type2 a) const
+ {
+ Type b = v;
+ if (sizeof (Type) < sizeof (int) && sizeof (Type2) < sizeof (int))
+ return (int) a - (int) b;
+ else
+ return a < b ? -1 : a == b ? 0 : +1;
+ }
+ inline bool sanitize (hb_sanitize_context_t *c) const
+ {
TRACE_SANITIZE (this);
- return TRACE_RETURN (likely (c->check_struct (this)));
+ return_trace (likely (c->check_struct (this)));
}
protected:
BEInt<Type, Size> v;
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. */
+typedef IntType<uint8_t, 1> HBUINT8; /* 8-bit unsigned integer. */
+typedef IntType<int8_t, 1> HBINT8; /* 8-bit signed integer. */
+typedef IntType<uint16_t, 2> HBUINT16; /* 16-bit unsigned integer. */
+typedef IntType<int16_t, 2> HBINT16; /* 16-bit signed integer. */
+typedef IntType<uint32_t, 4> HBUINT32; /* 32-bit unsigned integer. */
+typedef IntType<int32_t, 4> HBINT32; /* 32-bit signed integer. */
+typedef IntType<uint32_t, 3> HBUINT24; /* 24-bit unsigned integer. */
-/* 16-bit signed integer (SHORT) that describes a quantity in FUnits. */
-typedef SHORT FWORD;
+/* 16-bit signed integer (HBINT16) that describes a quantity in FUnits. */
+typedef HBINT16 FWORD;
-/* 16-bit unsigned integer (USHORT) that describes a quantity in FUnits. */
-typedef USHORT UFWORD;
+/* 16-bit unsigned integer (HBUINT16) that describes a quantity in FUnits. */
+typedef HBUINT16 UFWORD;
+
+/* 16-bit signed fixed number with the low 14 bits of fraction (2.14). */
+struct F2DOT14 : HBINT16
+{
+ // 16384 means 1<<14
+ inline float to_float (void) const { return ((int32_t) v) / 16384.f; }
+ inline void set_float (float f) { v.set (round (f * 16384.f)); }
+ public:
+ DEFINE_SIZE_STATIC (2);
+};
+
+/* 32-bit signed fixed-point number (16.16). */
+struct Fixed : HBINT32
+{
+ // 65536 means 1<<16
+ inline float to_float (void) const { return ((int32_t) v) / 65536.f; }
+ inline void set_float (float f) { v.set (round (f * 65536.f)); }
+ public:
+ DEFINE_SIZE_STATIC (4);
+};
/* 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) {
+ inline bool sanitize (hb_sanitize_context_t *c) const
+ {
TRACE_SANITIZE (this);
- return TRACE_RETURN (likely (c->check_struct (this)));
+ return_trace (likely (c->check_struct (this)));
}
- private:
- LONG major;
- ULONG minor;
+ protected:
+ HBINT32 major;
+ HBUINT32 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
+struct Tag : HBUINT32
{
/* 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); }
public:
DEFINE_SIZE_STATIC (4);
};
-DEFINE_NULL_DATA (Tag, " ");
+DEFINE_NULL_DATA (OT, Tag, " ");
/* Glyph index number, same as uint16 (length = 16 bits) */
-typedef USHORT GlyphID;
+typedef HBUINT16 GlyphID;
+
+/* Name-table index, same as uint16 (length = 16 bits) */
+typedef HBUINT16 NameID;
/* Script/language-system/feature index */
-struct Index : USHORT {
- static const unsigned int NOT_FOUND_INDEX = 0xFFFF;
+struct Index : HBUINT16 {
+ static const unsigned int NOT_FOUND_INDEX = 0xFFFFu;
};
-DEFINE_NULL_DATA (Index, "\xff\xff");
+DEFINE_NULL_DATA (OT, Index, "\xff\xff");
-/* Offset to a table, same as uint16 (length = 16 bits), Null offset = 0x0000 */
-struct Offset : USHORT
+/* Offset, Null offset = 0 */
+template <typename Type>
+struct Offset : Type
{
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; }
+ inline void *serialize (hb_serialize_context_t *c, const void *base)
+ {
+ void *t = c->start_embed<void> ();
+ this->set ((char *) t - (char *) base); /* TODO(serialize) Overflow? */
+ return t;
+ }
+
public:
- DEFINE_SIZE_STATIC (4);
+ DEFINE_SIZE_STATIC (sizeof(Type));
};
+typedef Offset<HBUINT16> Offset16;
+typedef Offset<HBUINT32> Offset32;
+
/* CheckSum */
-struct CheckSum : ULONG
+struct CheckSum : HBUINT32
{
- static uint32_t CalcTableChecksum (ULONG *Table, uint32_t Length)
+ /* This is reference implementation from the spec. */
+ static inline uint32_t CalcTableChecksum (const HBUINT32 *Table, uint32_t Length)
{
uint32_t Sum = 0L;
- ULONG *EndPtr = Table+((Length+3) & ~3) / ULONG::static_size;
+ assert (0 == (Length & 3));
+ const HBUINT32 *EndPtr = Table + Length / HBUINT32::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 HBUINT32 *) data, length)); }
+
public:
DEFINE_SIZE_STATIC (4);
};
* Version Numbers
*/
+template <typename FixedType=HBUINT16>
struct FixedVersion
{
- inline uint32_t to_int (void) const { return (major << 16) + minor; }
+ inline uint32_t to_int (void) const { return (major << (sizeof(FixedType) * 8)) + minor; }
- inline bool sanitize (hb_sanitize_context_t *c) {
+ inline bool sanitize (hb_sanitize_context_t *c) const
+ {
TRACE_SANITIZE (this);
- return TRACE_RETURN (c->check_struct (this));
+ return_trace (c->check_struct (this));
}
- USHORT major;
- USHORT minor;
+ FixedType major;
+ FixedType minor;
public:
- DEFINE_SIZE_STATIC (4);
+ DEFINE_SIZE_STATIC (2 * sizeof(FixedType));
};
/*
- * Template subclasses of Offset and LongOffset that do the dereferencing.
+ * Template subclasses of Offset that do the dereferencing.
* Use: (base+offset)
*/
-template <typename OffsetType, typename Type>
-struct GenericOffsetTo : OffsetType
+template <typename Type, typename OffsetType=HBUINT16>
+struct OffsetTo : Offset<OffsetType>
{
inline const Type& operator () (const void *base) const
{
unsigned int offset = *this;
if (unlikely (!offset)) return Null(Type);
- return StructAtOffset<Type> (base, offset);
+ return StructAtOffset<const Type> (base, offset);
}
- inline Type& operator () (void *base)
+ inline Type& operator () (void *base) const
{
unsigned int offset = *this;
+ if (unlikely (!offset)) return Crap(Type);
return StructAtOffset<Type> (base, offset);
}
- inline Type& serialize (hb_serialize_context_t *c, void *base)
+ inline Type& serialize (hb_serialize_context_t *c, const void *base)
{
- Type *t = c->start_embed<Type> ();
- this->set ((char *) t - (char *) base); /* TODO(serialize) Overflow? */
- return *t;
+ return * (Type *) Offset<OffsetType>::serialize (c, base);
}
- inline bool sanitize (hb_sanitize_context_t *c, void *base) {
+ inline bool sanitize (hb_sanitize_context_t *c, const void *base) const
+ {
TRACE_SANITIZE (this);
- if (unlikely (!c->check_struct (this))) return TRACE_RETURN (false);
+ if (unlikely (!c->check_struct (this))) return_trace (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));
+ if (unlikely (!offset)) return_trace (true);
+ if (unlikely (!c->check_range (base, offset))) return_trace (false);
+ const Type &obj = StructAtOffset<Type> (base, offset);
+ return_trace (likely (obj.sanitize (c)) || neuter (c));
}
template <typename T>
- inline bool sanitize (hb_sanitize_context_t *c, void *base, T user_data) {
+ inline bool sanitize (hb_sanitize_context_t *c, const void *base, T user_data) const
+ {
TRACE_SANITIZE (this);
- if (unlikely (!c->check_struct (this))) return TRACE_RETURN (false);
+ if (unlikely (!c->check_struct (this))) return_trace (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));
+ if (unlikely (!offset)) return_trace (true);
+ if (unlikely (!c->check_range (base, offset))) return_trace (false);
+ const Type &obj = StructAtOffset<Type> (base, offset);
+ return_trace (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;
+ inline bool neuter (hb_sanitize_context_t *c) const {
+ return c->try_set (this, 0);
}
+ DEFINE_SIZE_STATIC (sizeof(OffsetType));
};
+template <typename Type> struct LOffsetTo : OffsetTo<Type, HBUINT32> {};
template <typename Base, typename OffsetType, typename Type>
-inline const Type& operator + (const Base &base, const GenericOffsetTo<OffsetType, Type> &offset) { return offset (base); }
+static inline const Type& operator + (const Base &base, const OffsetTo<Type, OffsetType> &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> {};
+static inline Type& operator + (Base &base, OffsetTo<Type, OffsetType> &offset) { return offset (base); }
/*
* Array Types
*/
-template <typename LenType, typename Type>
-struct GenericArrayOf
+
+/* TODO Use it in ArrayOf, HeadlessArrayOf, and other places around the code base?? */
+template <typename Type>
+struct UnsizedArrayOf
+{
+ inline const Type& operator [] (unsigned int i) const { return arrayZ[i]; }
+ inline Type& operator [] (unsigned int i) { return arrayZ[i]; }
+
+ inline bool sanitize (hb_sanitize_context_t *c, unsigned int count) const
+ {
+ TRACE_SANITIZE (this);
+ if (unlikely (!sanitize_shallow (c, count))) return_trace (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 && arrayZ[0].sanitize (c));
+
+ return_trace (true);
+ }
+ inline bool sanitize (hb_sanitize_context_t *c, unsigned int count, const void *base) const
+ {
+ TRACE_SANITIZE (this);
+ if (unlikely (!sanitize_shallow (c, count))) return_trace (false);
+ for (unsigned int i = 0; i < count; i++)
+ if (unlikely (!arrayZ[i].sanitize (c, base)))
+ return_trace (false);
+ return_trace (true);
+ }
+ template <typename T>
+ inline bool sanitize (hb_sanitize_context_t *c, unsigned int count, const void *base, T user_data) const
+ {
+ TRACE_SANITIZE (this);
+ if (unlikely (!sanitize_shallow (c, count))) return_trace (false);
+ for (unsigned int i = 0; i < count; i++)
+ if (unlikely (!arrayZ[i].sanitize (c, base, user_data)))
+ return_trace (false);
+ return_trace (true);
+ }
+
+ inline bool sanitize_shallow (hb_sanitize_context_t *c, unsigned int count) const
+ {
+ TRACE_SANITIZE (this);
+ return_trace (c->check_array (arrayZ, arrayZ[0].static_size, count));
+ }
+
+ public:
+ Type arrayZ[VAR];
+ public:
+ DEFINE_SIZE_ARRAY (0, arrayZ);
+};
+
+/* Unsized array of offset's */
+template <typename Type, typename OffsetType>
+struct UnsizedOffsetArrayOf : UnsizedArrayOf<OffsetTo<Type, OffsetType> > {};
+
+/* Unsized array of offsets relative to the beginning of the array itself. */
+template <typename Type, typename OffsetType>
+struct UnsizedOffsetListOf : UnsizedOffsetArrayOf<Type, OffsetType>
+{
+ inline const Type& operator [] (unsigned int i) const
+ {
+ return this+this->arrayZ[i];
+ }
+
+ inline bool sanitize (hb_sanitize_context_t *c, unsigned int count) const
+ {
+ TRACE_SANITIZE (this);
+ return_trace ((UnsizedOffsetArrayOf<Type, OffsetType>::sanitize (c, count, this)));
+ }
+ template <typename T>
+ inline bool sanitize (hb_sanitize_context_t *c, unsigned int count, T user_data) const
+ {
+ TRACE_SANITIZE (this);
+ return_trace ((UnsizedOffsetArrayOf<Type, OffsetType>::sanitize (c, count, this, user_data)));
+ }
+};
+
+
+/* An array with a number of elements. */
+template <typename Type, typename LenType=HBUINT16>
+struct ArrayOf
{
const Type *sub_array (unsigned int start_offset, unsigned int *pcount /* IN/OUT */) const
{
count -= start_offset;
count = MIN (count, *pcount);
*pcount = count;
- return array + start_offset;
+ return arrayZ + start_offset;
}
inline const Type& operator [] (unsigned int i) const
{
if (unlikely (i >= len)) return Null(Type);
- return array[i];
+ return arrayZ[i];
}
inline Type& operator [] (unsigned int i)
{
- return array[i];
+ if (unlikely (i >= len)) return Crap(Type);
+ return arrayZ[i];
}
inline unsigned int get_size (void) const
{ return len.static_size + len * Type::static_size; }
unsigned int items_len)
{
TRACE_SERIALIZE (this);
- if (unlikely (!c->extend_min (*this))) return TRACE_RETURN (false);
+ if (unlikely (!c->extend_min (*this))) return_trace (false);
len.set (items_len); /* TODO(serialize) Overflow? */
- if (unlikely (!c->extend (*this))) return TRACE_RETURN (false);
- return TRACE_RETURN (true);
+ if (unlikely (!c->extend (*this))) return_trace (false);
+ return_trace (true);
}
inline bool serialize (hb_serialize_context_t *c,
unsigned int items_len)
{
TRACE_SERIALIZE (this);
- if (unlikely (!serialize (c, items_len))) return TRACE_RETURN (false);
+ if (unlikely (!serialize (c, items_len))) return_trace (false);
for (unsigned int i = 0; i < items_len; i++)
- array[i] = items[i];
- items.advance (items_len);
- return TRACE_RETURN (true);
+ arrayZ[i] = items[i];
+ items += items_len;
+ return_trace (true);
}
- inline bool sanitize (hb_sanitize_context_t *c) {
+ inline bool sanitize (hb_sanitize_context_t *c) const
+ {
TRACE_SANITIZE (this);
- if (unlikely (!sanitize_shallow (c))) return TRACE_RETURN (false);
+ if (unlikely (!sanitize_shallow (c))) return_trace (false);
/* Note: for structs that do not reference other structs,
* we do not need to call their sanitize() as we already did
* pointed to do have a simple sanitize(), ie. they do not
* reference other structs via offsets.
*/
- (void) (false && array[0].sanitize (c));
+ (void) (false && arrayZ[0].sanitize (c));
- return TRACE_RETURN (true);
+ return_trace (true);
}
- inline bool sanitize (hb_sanitize_context_t *c, void *base) {
+ inline bool sanitize (hb_sanitize_context_t *c, const void *base) const
+ {
TRACE_SANITIZE (this);
- if (unlikely (!sanitize_shallow (c))) return TRACE_RETURN (false);
+ if (unlikely (!sanitize_shallow (c))) return_trace (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);
+ if (unlikely (!arrayZ[i].sanitize (c, base)))
+ return_trace (false);
+ return_trace (true);
}
template <typename T>
- inline bool sanitize (hb_sanitize_context_t *c, void *base, T user_data) {
+ inline bool sanitize (hb_sanitize_context_t *c, const void *base, T user_data) const
+ {
TRACE_SANITIZE (this);
- if (unlikely (!sanitize_shallow (c))) return TRACE_RETURN (false);
+ if (unlikely (!sanitize_shallow (c))) return_trace (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);
+ if (unlikely (!arrayZ[i].sanitize (c, base, user_data)))
+ return_trace (false);
+ return_trace (true);
+ }
+
+ template <typename SearchType>
+ inline int lsearch (const SearchType &x) const
+ {
+ unsigned int count = len;
+ for (unsigned int i = 0; i < count; i++)
+ if (!this->arrayZ[i].cmp (x))
+ return i;
+ return -1;
+ }
+
+ inline void qsort (void)
+ {
+ ::qsort (arrayZ, len, sizeof (Type), Type::cmp);
}
private:
- inline bool sanitize_shallow (hb_sanitize_context_t *c) {
+ inline bool sanitize_shallow (hb_sanitize_context_t *c) const
+ {
TRACE_SANITIZE (this);
- return TRACE_RETURN (c->check_struct (this) && c->check_array (this, Type::static_size, len));
+ return_trace (len.sanitize (c) && c->check_array (arrayZ, Type::static_size, len));
}
public:
LenType len;
- Type array[VAR];
+ Type arrayZ[VAR];
public:
- DEFINE_SIZE_ARRAY (sizeof (LenType), array);
+ DEFINE_SIZE_ARRAY (sizeof (LenType), arrayZ);
};
-
-/* 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> {};
+template <typename Type> struct LArrayOf : ArrayOf<Type, HBUINT32> {};
/* 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> > {};
+template <typename Type, typename OffsetType=HBUINT16>
+struct OffsetArrayOf : ArrayOf<OffsetTo<Type, OffsetType> > {};
/* Array of offsets relative to the beginning of the array itself. */
template <typename Type>
inline const Type& operator [] (unsigned int i) const
{
if (unlikely (i >= this->len)) return Null(Type);
- return this+this->array[i];
+ return this+this->arrayZ[i];
+ }
+ inline const Type& operator [] (unsigned int i)
+ {
+ if (unlikely (i >= this->len)) return Crap(Type);
+ return this+this->arrayZ[i];
}
- inline bool sanitize (hb_sanitize_context_t *c) {
+ inline bool sanitize (hb_sanitize_context_t *c) const
+ {
TRACE_SANITIZE (this);
- return TRACE_RETURN (OffsetArrayOf<Type>::sanitize (c, this));
+ return_trace (OffsetArrayOf<Type>::sanitize (c, this));
}
template <typename T>
- inline bool sanitize (hb_sanitize_context_t *c, T user_data) {
+ inline bool sanitize (hb_sanitize_context_t *c, T user_data) const
+ {
TRACE_SANITIZE (this);
- return TRACE_RETURN (OffsetArrayOf<Type>::sanitize (c, this, user_data));
+ return_trace (OffsetArrayOf<Type>::sanitize (c, this, user_data));
}
};
-/* An array with a USHORT number of elements,
- * starting at second element. */
-template <typename Type>
+/* An array starting at second element. */
+template <typename Type, typename LenType=HBUINT16>
struct HeadlessArrayOf
{
inline const Type& operator [] (unsigned int i) const
{
if (unlikely (i >= len || !i)) return Null(Type);
- return array[i-1];
+ return arrayZ[i-1];
+ }
+ inline Type& operator [] (unsigned int i)
+ {
+ if (unlikely (i >= len || !i)) return Crap(Type);
+ return arrayZ[i-1];
}
inline unsigned int get_size (void) const
{ return len.static_size + (len ? len - 1 : 0) * Type::static_size; }
unsigned int items_len)
{
TRACE_SERIALIZE (this);
- if (unlikely (!c->extend_min (*this))) return TRACE_RETURN (false);
+ if (unlikely (!c->extend_min (*this))) return_trace (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);
+ if (unlikely (!items_len)) return_trace (true);
+ if (unlikely (!c->extend (*this))) return_trace (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);
+ arrayZ[i] = items[i];
+ items += items_len - 1;
+ return_trace (true);
}
- inline bool sanitize (hb_sanitize_context_t *c) {
+ inline bool sanitize (hb_sanitize_context_t *c) const
+ {
TRACE_SANITIZE (this);
- if (unlikely (!sanitize_shallow (c))) return TRACE_RETURN (false);
+ if (unlikely (!sanitize_shallow (c))) return_trace (false);
/* Note: for structs that do not reference other structs,
* we do not need to call their sanitize() as we already did
* pointed to do have a simple sanitize(), ie. they do not
* reference other structs via offsets.
*/
- (void) (false && array[0].sanitize (c));
+ (void) (false && arrayZ[0].sanitize (c));
+
+ return_trace (true);
+ }
- return TRACE_RETURN (true);
+ private:
+ inline bool sanitize_shallow (hb_sanitize_context_t *c) const
+ {
+ TRACE_SANITIZE (this);
+ return_trace (len.sanitize (c) &&
+ (!len || c->check_array (arrayZ, Type::static_size, len - 1)));
}
- USHORT len;
- Type array[VAR];
public:
- DEFINE_SIZE_ARRAY (sizeof (USHORT), array);
+ LenType len;
+ Type arrayZ[VAR];
+ public:
+ DEFINE_SIZE_ARRAY (sizeof (LenType), arrayZ);
};
-/* An array with sorted elements. Supports binary searching. */
+/*
+ * An array with sorted elements. Supports binary searching.
+ */
+template <typename Type, typename LenType=HBUINT16>
+struct SortedArrayOf : ArrayOf<Type, LenType>
+{
+ template <typename SearchType>
+ inline int bsearch (const SearchType &x) const
+ {
+ /* Hand-coded bsearch here since this is in the hot inner loop. */
+ const Type *arr = this->arrayZ;
+ int min = 0, max = (int) this->len - 1;
+ while (min <= max)
+ {
+ int mid = (min + max) / 2;
+ int c = arr[mid].cmp (x);
+ if (c < 0)
+ max = mid - 1;
+ else if (c > 0)
+ min = mid + 1;
+ else
+ return mid;
+ }
+ return -1;
+ }
+};
+
+/*
+ * Binary-search arrays
+ */
+
+struct BinSearchHeader
+{
+ inline operator uint32_t (void) const { return len; }
+
+ inline bool sanitize (hb_sanitize_context_t *c) const
+ {
+ TRACE_SANITIZE (this);
+ return_trace (c->check_struct (this));
+ }
+
+ inline void set (unsigned int v)
+ {
+ len.set (v);
+ assert (len == v);
+ entrySelector.set (MAX (1u, _hb_bit_storage (v)) - 1);
+ searchRange.set (16 * (1u << entrySelector));
+ rangeShift.set (v * 16 > searchRange
+ ? 16 * v - searchRange
+ : 0);
+ }
+
+ protected:
+ HBUINT16 len;
+ HBUINT16 searchRange;
+ HBUINT16 entrySelector;
+ HBUINT16 rangeShift;
+
+ public:
+ DEFINE_SIZE_STATIC (8);
+};
+
template <typename Type>
-struct SortedArrayOf : ArrayOf<Type> {
+struct BinSearchArrayOf : SortedArrayOf<Type, BinSearchHeader> {};
- template <typename SearchType>
- inline int search (const SearchType &x) const {
- unsigned int count = this->len;
- /* Linear search is *much* faster for small counts. */
- if (likely (count < 32)) {
- for (unsigned int i = 0; i < count; i++)
- if (this->array[i].cmp (x) == 0)
- return i;
- return -1;
- } else {
- struct Cmp {
- static int cmp (const SearchType *a, const Type *b) { return b->cmp (*a); }
- };
- const Type *p = (const Type *) bsearch (&x, this->array, this->len, sizeof (this->array[0]), (hb_compare_func_t) Cmp::cmp);
- return p ? p - this->array : -1;
+
+/* Lazy struct and blob loaders. */
+
+/* Logic is shared between hb_lazy_loader_t and hb_table_lazy_loader_t */
+template <typename T>
+struct hb_lazy_loader_t
+{
+ inline void init (hb_face_t *face_)
+ {
+ face = face_;
+ instance = nullptr;
+ }
+
+ inline void fini (void)
+ {
+ if (instance && instance != &Null(T))
+ {
+ instance->fini();
+ free (instance);
+ }
+ }
+
+ inline const T* get (void) const
+ {
+ retry:
+ T *p = (T *) hb_atomic_ptr_get (&instance);
+ if (unlikely (!p))
+ {
+ p = (T *) calloc (1, sizeof (T));
+ if (unlikely (!p))
+ p = const_cast<T *> (&Null(T));
+ else
+ p->init (face);
+ if (unlikely (!hb_atomic_ptr_cmpexch (const_cast<T **>(&instance), nullptr, p)))
+ {
+ if (p != &Null(T))
+ p->fini ();
+ goto retry;
+ }
}
+ return p;
}
+
+ inline const T* operator-> (void) const
+ {
+ return get ();
+ }
+
+ private:
+ hb_face_t *face;
+ T *instance;
+};
+
+/* Logic is shared between hb_lazy_loader_t and hb_table_lazy_loader_t */
+template <typename T>
+struct hb_table_lazy_loader_t
+{
+ inline void init (hb_face_t *face_)
+ {
+ face = face_;
+ blob = nullptr;
+ }
+
+ inline void fini (void)
+ {
+ hb_blob_destroy (blob);
+ }
+
+ inline const T* get (void) const
+ {
+ retry:
+ hb_blob_t *blob_ = (hb_blob_t *) hb_atomic_ptr_get (&blob);
+ if (unlikely (!blob_))
+ {
+ blob_ = OT::Sanitizer<T>().sanitize (face->reference_table (T::tableTag));
+ if (!hb_atomic_ptr_cmpexch (&blob, nullptr, blob_))
+ {
+ hb_blob_destroy (blob_);
+ goto retry;
+ }
+ blob = blob_;
+ }
+ return blob_->as<T> ();
+ }
+
+ inline const T* operator-> (void) const
+ {
+ return get();
+ }
+
+ private:
+ hb_face_t *face;
+ mutable hb_blob_t *blob;
};
projects / platform / upstream / harfbuzz.git / blobdiff