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[HB] Merge more templates

This commit is contained in:
Behdad Esfahbod 2009-08-04 10:41:32 -04:00
parent e6ab2c59ba
commit 92b5dd8e71
1 changed files with 55 additions and 112 deletions
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167
src/hb-open-types-private.hh
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@ -282,48 +282,6 @@ typedef USHORT Offset;
/* LongOffset to a table, same as uint32 (length = 32 bits), Null offset = 0x00000000 */ /* LongOffset to a table, same as uint32 (length = 32 bits), Null offset = 0x00000000 */
typedef ULONG LongOffset; typedef ULONG LongOffset;
/* Template subclasses of Offset and LongOffset that do the dereferencing. Use: (this+memberName) */
template <typename Type>
struct OffsetTo : Offset
{
inline const Type& operator() (const void *base) const
{
unsigned int offset = *this;
if (HB_UNLIKELY (!offset)) return Null(Type);
return *(const Type*)((const char *) base + offset);
}
inline bool sanitize (SANITIZE_ARG_DEF, const void *base) {
if (!SANITIZE_OBJ (*this)) return false;
unsigned int offset = *this;
if (HB_UNLIKELY (!offset)) return true;
return SANITIZE (*(Type*)((char *) base + offset)) || NEUTER (*this, 0);
}
};
template <typename Base, typename Type>
inline const Type& operator + (const Base &base, OffsetTo<Type> offset) { return offset (base); }
template <typename Type>
struct LongOffsetTo : LongOffset
{
inline const Type& operator() (const void *base) const
{
unsigned int offset = *this;
if (HB_UNLIKELY (!offset)) return Null(Type);
return *(const Type*)((const char *) base + offset);
}
inline bool sanitize (SANITIZE_ARG_DEF, const void *base) {
if (!SANITIZE (*this)) return false;
unsigned int offset = *this;
if (HB_UNLIKELY (!offset)) return true;
return SANITIZE (*(Type*)((char *) base + offset)) || NEUTER (*this, 0);
}
};
template <typename Base, typename Type>
inline const Type& operator + (const Base &base, LongOffsetTo<Type> offset) { return offset (base); }
/* CheckSum */ /* CheckSum */
struct CheckSum : ULONG struct CheckSum : ULONG
@ -358,13 +316,44 @@ struct FixedVersion
}; };
ASSERT_SIZE (FixedVersion, 4); ASSERT_SIZE (FixedVersion, 4);
/*
* Template subclasses of Offset and LongOffset that do the dereferencing.
* Use: (this+memberName)
*/
template <typename OffsetType, typename Type>
struct GenericOffsetTo : OffsetType
{
inline const Type& operator() (const void *base) const
{
unsigned int offset = *this;
if (HB_UNLIKELY (!offset)) return Null(Type);
return *(const Type*)((const char *) base + offset);
}
inline bool sanitize (SANITIZE_ARG_DEF, const void *base) {
if (!SANITIZE_OBJ (*this)) return false;
unsigned int offset = *this;
if (HB_UNLIKELY (!offset)) return true;
return SANITIZE (*(Type*)((char *) base + offset)) || NEUTER (*this, 0);
}
};
template <typename Base, typename OffsetType, typename Type>
inline const Type& operator + (const Base &base, GenericOffsetTo<OffsetType, Type> offset) { return offset (base); }
template <typename Type>
struct OffsetTo : GenericOffsetTo<Offset, Type> {};
template <typename Type>
struct LongOffsetTo : GenericOffsetTo<LongOffset, Type> {};
/* /*
* Array Types * Array Types
*/ */
/* An array with a USHORT number of elements. */ template <typename LenType, typename Type>
template <typename Type> struct GenericArrayOf
struct ArrayOf
{ {
inline const Type& operator [] (unsigned int i) const inline const Type& operator [] (unsigned int i) const
{ {
@ -391,10 +380,30 @@ struct ArrayOf
return false; return false;
} }
USHORT len; LenType len;
Type array[]; Type array[];
}; };
/* An array with a USHORT number of elements. */
template <typename Type>
struct ArrayOf : GenericArrayOf<USHORT, Type> {};
/* An array with a ULONG number of elements. */
template <typename Type>
struct LongArrayOf : GenericArrayOf<ULONG, Type> {};
/* Array of Offset's */
template <typename Type>
struct OffsetArrayOf : ArrayOf<OffsetTo<Type> > {};
/* Array of LongOffset's */
template <typename Type>
struct LongOffsetArrayOf : ArrayOf<LongOffsetTo<Type> > {};
/* LongArray of LongOffset's */
template <typename Type>
struct LongOffsetLongArrayOf : LongArrayOf<LongOffsetTo<Type> > {};
/* An array with a USHORT number of elements, /* An array with a USHORT number of elements,
* starting at second element. */ * starting at second element. */
template <typename Type> template <typename Type>
@ -417,76 +426,10 @@ struct HeadlessArrayOf
return false; return false;
*/ */
} }
inline bool sanitize (SANITIZE_ARG_DEF, const char *base) {
if (!(SANITIZE (len) && SANITIZE_GET_SIZE())) return false;
unsigned int count = len;
for (unsigned int i = 0; i < count; i++)
if (!SANITIZE_THIS (array[i]))
return false;
}
USHORT len; USHORT len;
Type array[]; Type array[];
}; };
/* An array with a ULONG number of elements. */
template <typename Type>
struct LongArrayOf
{
inline const Type& operator [] (unsigned int i) const
{
if (HB_UNLIKELY (i >= len)) return Null(Type);
return array[i];
}
inline unsigned int get_size () const
{ return sizeof (len) + len * sizeof (array[0]); }
inline bool sanitize (SANITIZE_ARG_DEF) {
if (!(SANITIZE_SELF () && SANITIZE_GET_SIZE())) return false;
unsigned int count = len;
/* Note; for non-recursive types, this is not much needed
for (unsigned int i = 0; i < count; i++)
if (!SANITIZE (array[i]))
return false;
*/
}
inline bool sanitize (SANITIZE_ARG_DEF, const char *base) {
if (!(SANITIZE (len) && SANITIZE_GET_SIZE())) return false;
unsigned int count = len;
for (unsigned int i = 0; i < count; i++)
if (!SANITIZE_THIS (array[i]))
return false;
}
ULONG len;
Type array[];
};
/* 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> > {};
/* An array type is one that contains a variable number of objects
* as its last item. An array object is extended with get_len()
* methods, as well as overloaded [] operator. */
#define DEFINE_ARRAY_TYPE(Type, array, num) \
DEFINE_INDEX_OPERATOR(Type, array, num) \
DEFINE_LEN(Type, array, num)
#define DEFINE_INDEX_OPERATOR(Type, array, num) \
inline const Type& operator[] (unsigned int i) const \
{ \
if (HB_UNLIKELY (i >= num)) return Null(Type); \
return array[i]; \
}
#endif /* HB_OPEN_TYPES_PRIVATE_HH */ #endif /* HB_OPEN_TYPES_PRIVATE_HH */