diff options
Diffstat (limited to 'src/3rdparty/harfbuzz-ng/src/hb-open-type-private.hh')
-rw-r--r-- | src/3rdparty/harfbuzz-ng/src/hb-open-type-private.hh | 1184 |
1 files changed, 0 insertions, 1184 deletions
diff --git a/src/3rdparty/harfbuzz-ng/src/hb-open-type-private.hh b/src/3rdparty/harfbuzz-ng/src/hb-open-type-private.hh deleted file mode 100644 index 2f4e1b9e9e..0000000000 --- a/src/3rdparty/harfbuzz-ng/src/hb-open-type-private.hh +++ /dev/null @@ -1,1184 +0,0 @@ -/* - * 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" -#include "hb-debug.hh" -#include "hb-face-private.hh" - - -namespace OT { - - - -/* - * Casts - */ - -/* Cast to struct T, reference to reference */ -template<typename Type, typename TObject> -static inline const Type& CastR(const TObject &X) -{ return reinterpret_cast<const Type&> (X); } -template<typename Type, typename TObject> -static inline Type& CastR(TObject &X) -{ return reinterpret_cast<Type&> (X); } - -/* Cast to struct T, pointer to pointer */ -template<typename Type, typename TObject> -static inline const Type* CastP(const TObject *X) -{ return reinterpret_cast<const Type*> (X); } -template<typename Type, typename TObject> -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> -static inline const Type& StructAtOffset(const void *P, unsigned int offset) -{ return * reinterpret_cast<const Type*> ((const char *) P + offset); } -template<typename Type> -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> -static inline const Type& StructAfter(const TObject &X) -{ return StructAtOffset<Type>(&X, X.get_size()); } -template<typename Type, typename TObject> -static 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 \ - { \ - 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_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); \ - inline unsigned int get_size (void) const { return (size); } - -#define DEFINE_SIZE_UNION(size, _member) \ - 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) \ - 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. */ - -#define HB_NULL_POOL_SIZE 264 -static_assert (HB_NULL_POOL_SIZE % sizeof (void *) == 0, "Align HB_NULL_POOL_SIZE."); -extern HB_INTERNAL const void * const _hb_NullPool[HB_NULL_POOL_SIZE / sizeof (void *)]; - -/* Generic nul-content Null objects. */ -template <typename Type> -static inline const Type& Null (void) { - static_assert (sizeof (Type) <= HB_NULL_POOL_SIZE, "Increase HB_NULL_POOL_SIZE."); - return *CastP<Type> (_hb_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 <> \ -/*static*/ 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 */ \ -static_assert (Type::min_size + 1 <= sizeof (_Null##Type), "Null pool too small. Enlarge.") - -/* Accessor macro. */ -#define Null(Type) Null<Type>() - - -/* - * Dispatch - */ - -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 - */ - -/* This limits sanitizing time on really broken fonts. */ -#ifndef HB_SANITIZE_MAX_EDITS -#define HB_SANITIZE_MAX_EDITS 32 -#endif - -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), - blob (nullptr) {} - - inline const char *get_name (void) { return "SANITIZE"; } - 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 dispatch (const T &obj) { return obj.sanitize (this); } - static return_t default_return_value (void) { return true; } - 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) - { - this->blob = hb_blob_reference (b); - this->writable = false; - } - - inline void start_processing (void) - { - this->start = hb_blob_get_data (this->blob, nullptr); - this->end = this->start + hb_blob_get_length (this->blob); - assert (this->start <= this->end); /* Must not overflow. */ - this->edit_count = 0; - this->debug_depth = 0; - - 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->start, 0, -1, - "end [%p..%p] %u edit requests", - this->start, this->end, this->edit_count); - - hb_blob_destroy (this->blob); - 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->start <= p && p <= this->end && (unsigned int) (this->end - p) >= len; - - 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, - ok ? "OK" : "OUT-OF-RANGE"); - - 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); - - 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 likely (ok); - } - - 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++; - - 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 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; - 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]; - bool sane; - - /* TODO is_sane() stuff */ - - c->init (blob); - - retry: - DEBUG_MSG_FUNC (SANITIZE, c->start, "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, 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, 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, nullptr); - 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, c->start, "retry"); - goto retry; - } - } - } - - c->end_processing (); - - DEBUG_MSG_FUNC (SANITIZE, c->start, 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, nullptr); - return unlikely (!base) ? &Null(Type) : CastP<Type> (base); - } -}; - - - -/* - * Serialize - */ - - -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 nullptr; - } - 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 nullptr; - 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 nullptr; - 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 nullptr; - return reinterpret_cast<Type *> (&obj); - } - - inline void truncate (void *new_head) - { - assert (this->start < new_head && new_head <= this->head); - this->head = (char *) new_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, 1> -{ - public: - inline void set (Type V) - { - v = V; - } - inline operator Type (void) const - { - return v; - } - private: uint8_t v; -}; -template <typename Type> -struct BEInt<Type, 2> -{ - public: - 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 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> -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 (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); } - 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 (likely (c->check_struct (this))); - } - protected: - BEInt<Type, Size> v; - public: - DEFINE_SIZE_STATIC (Size); -}; - -typedef IntType<uint8_t, 1> UINT8; /* 8-bit unsigned integer. */ -typedef IntType<int8_t, 1> INT8; /* 8-bit signed integer. */ -typedef IntType<uint16_t, 2> UINT16; /* 16-bit unsigned integer. */ -typedef IntType<int16_t, 2> INT16; /* 16-bit signed integer. */ -typedef IntType<uint32_t, 4> UINT32; /* 32-bit unsigned integer. */ -typedef IntType<int32_t, 4> INT32; /* 32-bit signed integer. */ -typedef IntType<uint32_t, 3> UINT24; /* 24-bit unsigned integer. */ - -/* 16-bit signed integer (INT16) that describes a quantity in FUnits. */ -typedef INT16 FWORD; - -/* 16-bit unsigned integer (UINT16) that describes a quantity in FUnits. */ -typedef UINT16 UFWORD; - -/* 16-bit signed fixed number with the low 14 bits of fraction (2.14). */ -struct F2DOT14 : INT16 -{ - //inline float to_float (void) const { return ???; } - //inline void set_float (float f) { v.set (f * ???); } - public: - DEFINE_SIZE_STATIC (2); -}; - -/* 32-bit signed fixed-point number (16.16). */ -struct Fixed: INT32 -{ - //inline float to_float (void) const { return ???; } - //inline void set_float (float f) { v.set (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) const - { - TRACE_SANITIZE (this); - return_trace (likely (c->check_struct (this))); - } - protected: - INT32 major; - UINT32 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 : UINT32 -{ - /* 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 UINT16 GlyphID; - -/* Script/language-system/feature index */ -struct Index : UINT16 { - static const unsigned int NOT_FOUND_INDEX = 0xFFFFu; -}; -DEFINE_NULL_DATA (Index, "\xff\xff"); - -/* Offset, Null offset = 0 */ -template <typename Type> -struct Offset : Type -{ - inline bool is_null (void) const { return 0 == *this; } - public: - DEFINE_SIZE_STATIC (sizeof(Type)); -}; - -typedef Offset<UINT16> Offset16; -typedef Offset<UINT32> Offset32; - - -/* CheckSum */ -struct CheckSum : UINT32 -{ - /* This is reference implementation from the spec. */ - static inline uint32_t CalcTableChecksum (const UINT32 *Table, uint32_t Length) - { - uint32_t Sum = 0L; - const UINT32 *EndPtr = Table+((Length+3) & ~3) / UINT32::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 UINT32 *) data, length)); } - - public: - DEFINE_SIZE_STATIC (4); -}; - - -/* - * Version Numbers - */ - -template <typename FixedType=UINT16> -struct FixedVersion -{ - inline uint32_t to_int (void) const { return (major << (sizeof(FixedType) * 8)) + minor; } - - inline bool sanitize (hb_sanitize_context_t *c) const - { - TRACE_SANITIZE (this); - return_trace (c->check_struct (this)); - } - - FixedType major; - FixedType minor; - public: - DEFINE_SIZE_STATIC (2 * sizeof(FixedType)); -}; - - - -/* - * Template subclasses of Offset that do the dereferencing. - * Use: (base+offset) - */ - -template <typename Type, typename OffsetType=UINT16> -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); - } - - 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; - } - - inline bool sanitize (hb_sanitize_context_t *c, const void *base) const - { - TRACE_SANITIZE (this); - if (unlikely (!c->check_struct (this))) return_trace (false); - unsigned int offset = *this; - 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, const void *base, T user_data) const - { - TRACE_SANITIZE (this); - if (unlikely (!c->check_struct (this))) return_trace (false); - unsigned int offset = *this; - 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)); - } - - /* Set the offset to Null */ - 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, UINT32> {}; -template <typename Base, typename OffsetType, typename Type> -static inline const Type& operator + (const Base &base, const OffsetTo<Type, OffsetType> &offset) { return offset (base); } -template <typename Base, typename OffsetType, typename Type> -static inline Type& operator + (Base &base, OffsetTo<Type, OffsetType> &offset) { return offset (base); } - - -/* - * Array Types - */ - -/* An array with a number of elements. */ -template <typename Type, typename LenType=UINT16> -struct ArrayOf -{ - 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 (false); - len.set (items_len); /* TODO(serialize) Overflow? */ - if (unlikely (!c->extend (*this))) return_trace (false); - return_trace (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 (false); - for (unsigned int i = 0; i < items_len; i++) - array[i] = items[i]; - items.advance (items_len); - return_trace (true); - } - - inline bool sanitize (hb_sanitize_context_t *c) const - { - TRACE_SANITIZE (this); - 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 - * 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 (true); - } - inline bool sanitize (hb_sanitize_context_t *c, const void *base) const - { - TRACE_SANITIZE (this); - 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 (false); - return_trace (true); - } - template <typename T> - 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 (false); - unsigned int count = len; - for (unsigned int i = 0; i < count; i++) - if (unlikely (!array[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->array[i].cmp (x)) - return i; - return -1; - } - - private: - inline bool sanitize_shallow (hb_sanitize_context_t *c) const - { - TRACE_SANITIZE (this); - return_trace (len.sanitize (c) && c->check_array (array, Type::static_size, len)); - } - - public: - LenType len; - Type array[VAR]; - public: - DEFINE_SIZE_ARRAY (sizeof (LenType), array); -}; -template <typename Type> struct LArrayOf : ArrayOf<Type, UINT32> {}; - -/* Array of Offset's */ -template <typename Type, typename OffsetType=UINT16> -struct OffsetArrayOf : ArrayOf<OffsetTo<Type, OffsetType> > {}; - -/* 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) const - { - TRACE_SANITIZE (this); - return_trace (OffsetArrayOf<Type>::sanitize (c, this)); - } - template <typename T> - inline bool sanitize (hb_sanitize_context_t *c, T user_data) const - { - TRACE_SANITIZE (this); - return_trace (OffsetArrayOf<Type>::sanitize (c, this, user_data)); - } -}; - - -/* An array starting at second element. */ -template <typename Type, typename LenType=UINT16> -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 (false); - len.set (items_len); /* TODO(serialize) Overflow? */ - 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 (true); - } - - inline bool sanitize (hb_sanitize_context_t *c) const - { - TRACE_SANITIZE (this); - 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 - * 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 (true); - } - - private: - inline bool sanitize_shallow (hb_sanitize_context_t *c) const - { - TRACE_SANITIZE (this); - return_trace (len.sanitize (c) && - (!len || c->check_array (array, Type::static_size, len - 1))); - } - - public: - LenType len; - Type array[VAR]; - public: - DEFINE_SIZE_ARRAY (sizeof (LenType), array); -}; - - -/* - * An array with sorted elements. Supports binary searching. - */ -template <typename Type, typename LenType=UINT16> -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 *array = this->array; - int min = 0, max = (int) this->len - 1; - while (min <= max) - { - int mid = (min + max) / 2; - int c = array[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)); - } - - protected: - UINT16 len; - UINT16 searchRangeZ; - UINT16 entrySelectorZ; - UINT16 rangeShiftZ; - - public: - DEFINE_SIZE_STATIC (8); -}; - -template <typename Type> -struct BinSearchArrayOf : SortedArrayOf<Type, BinSearchHeader> {}; - - -/* Lazy struct and blob loaders. */ - -/* Logic is shared between hb_lazy_loader_t and hb_lazy_table_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 != &OT::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 *> (&OT::Null(T)); - else - p->init (face); - if (unlikely (!hb_atomic_ptr_cmpexch (const_cast<T **>(&instance), nullptr, p))) - { - if (p != &OT::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_lazy_table_loader_t */ -template <typename T> -struct hb_lazy_table_loader_t -{ - inline void init (hb_face_t *face_) - { - face = face_; - instance = nullptr; - blob = nullptr; - } - - inline void fini (void) - { - hb_blob_destroy (blob); - } - - inline const T* get (void) const - { - retry: - T *p = (T *) hb_atomic_ptr_get (&instance); - if (unlikely (!p)) - { - hb_blob_t *blob_ = OT::Sanitizer<T>::sanitize (face->reference_table (T::tableTag)); - p = const_cast<T *>(OT::Sanitizer<T>::lock_instance (blob_)); - if (!hb_atomic_ptr_cmpexch (const_cast<T **>(&instance), nullptr, p)) - { - hb_blob_destroy (blob_); - goto retry; - } - blob = blob_; - } - return p; - } - - inline const T* operator-> (void) const - { - return get(); - } - - private: - hb_face_t *face; - T *instance; - mutable hb_blob_t *blob; -}; - - -} /* namespace OT */ - - -#endif /* HB_OPEN_TYPE_PRIVATE_HH */ |