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Reinstante DEFINE_NULL_DATA 

Seems like I messed up; buffer overrun got reported.
This commit is contained in:
Behdad Esfahbod 2018-05-09 15:27:17 -07:00
parent 93bdf9b2df
commit 191c4edc54
3 changed files with 18 additions and 10 deletions
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2
src/hb-open-type-private.hh
View File

@ -685,6 +685,7 @@ struct Tag : HBUINT32
public:
DEFINE_SIZE_STATIC (4);
};
DEFINE_NULL_DATA (OT, Tag, " ");
/* Glyph index number, same as uint16 (length = 16 bits) */
typedef HBUINT16 GlyphID;
@ -696,6 +697,7 @@ typedef HBUINT16 NameID;
struct Index : HBUINT16 {
static const unsigned int NOT_FOUND_INDEX = 0xFFFFu;
};
DEFINE_NULL_DATA (OT, Index, "\xff\xff");
/* Offset, Null offset = 0 */
template <typename Type>

13
src/hb-ot-layout-common-private.hh
View File

@ -165,6 +165,7 @@ struct RangeRecord
public:
DEFINE_SIZE_STATIC (6);
};
DEFINE_NULL_DATA (OT, RangeRecord, "\000\001");
struct IndexArray : ArrayOf<Index>
@ -224,6 +225,7 @@ struct LangSys
public:
DEFINE_SIZE_ARRAY (6, featureIndex);
};
DEFINE_NULL_DATA (OT, LangSys, "\0\0\xFF\xFF");
struct Script
@ -245,16 +247,7 @@ struct Script
{ return langSys.find_index (tag, index); }
inline bool has_default_lang_sys (void) const { return defaultLangSys != 0; }
inline const LangSys& get_default_lang_sys (void) const
{
if (!defaultLangSys)
{
/* This is the ONLY place where our null data is not all zeros.
* So, return special data instead of using the null pool. */
return *reinterpret_cast<const LangSys *> ("\0\0\xFF\xFF");
}
return this+defaultLangSys;
}
inline const LangSys& get_default_lang_sys (void) const { return this+defaultLangSys; }
inline bool sanitize (hb_sanitize_context_t *c,
const Record<Script>::sanitize_closure_t * = nullptr) const

13
src/hb-private.hh
View File

@ -1117,5 +1117,18 @@ static inline const Type& Null (void) {
}
#define Null(Type) Null<Type>()
/* Specializaiton for arbitrary-content arbitrary-sized Null objects. */
#define DEFINE_NULL_DATA(Namespace, Type, data) \
} /* Close namespace. */ \
static const char _Null##Type[sizeof (Namespace::Type) + 1] = data; /* +1 is for nul-termination in data */ \
template <> \
/*static*/ inline const Namespace::Type& Null<Namespace::Type> (void) { \
return *reinterpret_cast<const Namespace::Type *> (_Null##Type); \
} \
namespace Namespace { \
/* The following line really exists such that we end in a place needing semicolon */ \
static_assert (Namespace::Type::min_size + 1 <= sizeof (_Null##Type), "Null pool too small. Enlarge.")
#endif /* HB_PRIVATE_HH */