提交 92b1e025 编写于 作者: B Behdad Esfahbod

Move some code from hb-open-type-private.hh to hb-machinery-private.hh

上级 6b11fea9
......@@ -16,6 +16,7 @@ HB_BASE_sources = \
hb-font.cc \
hb-map-private.hh \
hb-map.cc \
hb-machinery-private.hh \
hb-mutex-private.hh \
hb-object-private.hh \
hb-open-file-private.hh \
......
/*
* Copyright © 2007,2008,2009,2010 Red Hat, Inc.
* Copyright © 2012,2018 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_MACHINERY_PRIVATE_HH
#define HB_MACHINERY_PRIVATE_HH
#include "hb-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)
/*
* 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
#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
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 (65536),
num_glyphs_set (false) {}
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 set_num_glyphs (unsigned int num_glyphs_)
{
num_glyphs = num_glyphs_;
num_glyphs_set = true;
}
inline unsigned int get_num_glyphs (void) { return num_glyphs; }
inline void start_processing (void)
{
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, 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->max_ops-- > 0 &&
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_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, unsigned int len)
{
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;
}
template <typename Type>
inline hb_blob_t *sanitize_blob (hb_blob_t *blob)
{
bool sane;
init (blob);
retry:
DEBUG_MSG_FUNC (SANITIZE, start, "start");
start_processing ();
if (unlikely (!start))
{
end_processing ();
return blob;
}
Type *t = CastP<Type> (const_cast<char *> (start));
sane = t->sanitize (this);
if (sane)
{
if (edit_count)
{
DEBUG_MSG_FUNC (SANITIZE, start, "passed first round with %d edits; going for second round", edit_count);
/* sanitize again to ensure no toe-stepping */
edit_count = 0;
sane = t->sanitize (this);
if (edit_count) {
DEBUG_MSG_FUNC (SANITIZE, start, "requested %d edits in second round; FAILLING", edit_count);
sane = false;
}
}
}
else
{
if (edit_count && !writable) {
start = hb_blob_get_data_writable (blob, nullptr);
end = start + blob->length;
if (start)
{
writable = true;
/* ok, we made it writable by relocating. try again */
DEBUG_MSG_FUNC (SANITIZE, start, "retry");
goto retry;
}
}
}
end_processing ();
DEBUG_MSG_FUNC (SANITIZE, start, sane ? "PASSED" : "FAILED");
if (sane)
{
blob->lock ();
return blob;
}
else
{
hb_blob_destroy (blob);
return hb_blob_get_empty ();
}
}
template <typename Type>
inline hb_blob_t *reference_table (const hb_face_t *face, hb_tag_t tableTag = Type::tableTag)
{
if (!num_glyphs_set)
set_num_glyphs (face->get_num_glyphs ());
return sanitize_blob<Type> (face->reference_table (tableTag));
}
mutable unsigned int debug_depth;
const char *start, *end;
private:
bool writable;
unsigned int edit_count;
mutable int max_ops;
hb_blob_t *blob;
unsigned int num_glyphs;
bool num_glyphs_set;
};
/*
* 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;
};
/*
* Supplier
*/
template <typename Type>
struct Supplier
{
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 * (const Type *) (const void *) ((const char *) head + stride * i);
}
inline Supplier<Type> & operator += (unsigned int count)
{
if (unlikely (count > len))
count = len;
len -= count;
head = (const Type *) (const void *) ((const char *) head + stride * count);
return *this;
}
private:
inline Supplier (const Supplier<Type> &); /* Disallow copy */
inline Supplier<Type>& operator= (const Supplier<Type> &); /* Disallow copy */
unsigned int len;
unsigned int stride;
const Type *head;
};
/*
* Big-endian integers.
*/
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];
};
/*
* 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;
mutable 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 hb_blob_t* get_blob (void) const
{
retry:
hb_blob_t *b = (hb_blob_t *) hb_atomic_ptr_get (&blob);
if (unlikely (!b))
{
b = OT::hb_sanitize_context_t().reference_table<T> (face);
if (!hb_atomic_ptr_cmpexch (&blob, nullptr, b))
{
hb_blob_destroy (b);
goto retry;
}
blob = b;
}
return b;
}
inline const T* get (void) const
{
hb_blob_t *b = get_blob ();
return b->as<T> ();
}
inline const T* operator-> (void) const
{
return get();
}
private:
hb_face_t *face;
mutable hb_blob_t *blob;
};
} /* namespace OT */
#endif /* HB_MACHINERY_PRIVATE_HH */
......@@ -32,492 +32,12 @@
#include "hb-private.hh"
#include "hb-blob-private.hh"
#include "hb-face-private.hh"
#include "hb-machinery-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)
/*
* 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
#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
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 (65536),
num_glyphs_set (false) {}
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 set_num_glyphs (unsigned int num_glyphs_)
{
num_glyphs = num_glyphs_;
num_glyphs_set = true;
}
inline unsigned int get_num_glyphs (void) { return num_glyphs; }
inline void start_processing (void)
{
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, 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->max_ops-- > 0 &&
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_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, unsigned int len)
{
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;
}
template <typename Type>
inline hb_blob_t *sanitize_blob (hb_blob_t *blob)
{
bool sane;
init (blob);
retry:
DEBUG_MSG_FUNC (SANITIZE, start, "start");
start_processing ();
if (unlikely (!start))
{
end_processing ();
return blob;
}
Type *t = CastP<Type> (const_cast<char *> (start));
sane = t->sanitize (this);
if (sane)
{
if (edit_count)
{
DEBUG_MSG_FUNC (SANITIZE, start, "passed first round with %d edits; going for second round", edit_count);
/* sanitize again to ensure no toe-stepping */
edit_count = 0;
sane = t->sanitize (this);
if (edit_count) {
DEBUG_MSG_FUNC (SANITIZE, start, "requested %d edits in second round; FAILLING", edit_count);
sane = false;
}
}
}
else
{
if (edit_count && !writable) {
start = hb_blob_get_data_writable (blob, nullptr);
end = start + blob->length;
if (start)
{
writable = true;
/* ok, we made it writable by relocating. try again */
DEBUG_MSG_FUNC (SANITIZE, start, "retry");
goto retry;
}
}
}
end_processing ();
DEBUG_MSG_FUNC (SANITIZE, start, sane ? "PASSED" : "FAILED");
if (sane)
{
blob->lock ();
return blob;
}
else
{
hb_blob_destroy (blob);
return hb_blob_get_empty ();
}
}
template <typename Type>
inline hb_blob_t *reference_table (const hb_face_t *face, hb_tag_t tableTag = Type::tableTag)
{
if (!num_glyphs_set)
set_num_glyphs (face->get_num_glyphs ());
return sanitize_blob<Type> (face->reference_table (tableTag));
}
mutable unsigned int debug_depth;
const char *start, *end;
private:
bool writable;
unsigned int edit_count;
mutable int max_ops;
hb_blob_t *blob;
unsigned int num_glyphs;
bool num_glyphs_set;
};
/*
* 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_, 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 * (const Type *) (const void *) ((const char *) head + stride * i);
}
inline Supplier<Type> & operator += (unsigned int count)
{
if (unlikely (count > len))
count = len;
len -= count;
head = (const Type *) (const void *) ((const char *) head + stride * count);
return *this;
}
private:
inline Supplier (const Supplier<Type> &); /* Disallow copy */
inline Supplier<Type>& operator= (const Supplier<Type> &); /* Disallow copy */
unsigned int len;
unsigned int stride;
const Type *head;
};
/*
*
* The OpenType Font File: Data Types
......@@ -531,78 +51,6 @@ struct Supplier
* 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
......@@ -773,7 +221,6 @@ struct FixedVersion
};
/*
* Template subclasses of Offset that do the dereferencing.
* Use: (base+offset)
......@@ -839,7 +286,6 @@ static inline Type& operator + (Base &base, OffsetTo<Type, OffsetType> &offset)
* Array Types
*/
/* TODO Use it in ArrayOf, HeadlessArrayOf, and other places around the code base?? */
template <typename Type>
struct UnsizedArrayOf
......@@ -921,7 +367,6 @@ struct UnsizedOffsetListOf : UnsizedOffsetArrayOf<Type, OffsetType>
}
};
/* An array with a number of elements. */
template <typename Type, typename LenType=HBUINT16>
struct ArrayOf
......@@ -1074,7 +519,6 @@ struct OffsetListOf : OffsetArrayOf<Type>
}
};
/* An array starting at second element. */
template <typename Type, typename LenType=HBUINT16>
struct HeadlessArrayOf
......@@ -1139,10 +583,7 @@ struct HeadlessArrayOf
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>
{
......@@ -1167,10 +608,7 @@ struct SortedArrayOf : ArrayOf<Type, LenType>
}
};
/*
* Binary-search arrays
*/
/* Binary-search arrays */
struct BinSearchHeader
{
inline operator uint32_t (void) const { return len; }
......@@ -1206,107 +644,6 @@ template <typename Type>
struct BinSearchArrayOf : SortedArrayOf<Type, BinSearchHeader> {};
/* 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;
mutable 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 hb_blob_t* get_blob (void) const
{
retry:
hb_blob_t *b = (hb_blob_t *) hb_atomic_ptr_get (&blob);
if (unlikely (!b))
{
b = OT::hb_sanitize_context_t().reference_table<T> (face);
if (!hb_atomic_ptr_cmpexch (&blob, nullptr, b))
{
hb_blob_destroy (b);
goto retry;
}
blob = b;
}
return b;
}
inline const T* get (void) const
{
hb_blob_t *b = get_blob ();
return b->as<T> ();
}
inline const T* operator-> (void) const
{
return get();
}
private:
hb_face_t *face;
mutable hb_blob_t *blob;
};
} /* namespace OT */
......
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