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Support dfont font files (#949)

This commit is contained in:
Ebrahim Byagowi 2018-07-01 14:32:00 +04:30 committed by GitHub
parent 5d8cafcf6a
commit 225b92b7d4
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GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 200 additions and 0 deletions
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196
src/hb-open-file-private.hh
View File

@ -286,6 +286,197 @@ struct TTCHeader
} u;
};
/*
* Mac Resource Fork
*/
struct ResourceRefItem
{
inline bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
// actual data sanitization is done on ResourceForkHeader sanitizer
return_trace (likely (c->check_struct (this)));
}
HBINT16 id; /* Resource ID, is really should be signed? */
HBINT16 nameOffset; /* Offset from beginning of resource name list
* to resource name, minus means there is no */
HBUINT8 attr; /* Resource attributes */
HBUINT24 dataOffset; /* Offset from beginning of resource data to
* data for this resource */
HBUINT32 reserved; /* Reserved for handle to resource */
public:
DEFINE_SIZE_STATIC (12);
};
struct ResourceTypeItem
{
inline bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
// RefList sanitization is done on ResourceMap sanitizer
return_trace (likely (c->check_struct (this)));
}
inline unsigned int get_resource_count () const
{
return numRes + 1;
}
inline bool is_sfnt () const
{
return type == HB_TAG ('s','f','n','t');
}
inline const ResourceRefItem& get_ref_item (const void *base,
unsigned int i) const
{
return (base+refList)[i];
}
protected:
Tag type; /* Resource type */
HBUINT16 numRes; /* Number of resource this type in map minus 1 */
OffsetTo<UnsizedArrayOf<ResourceRefItem> >
refList; /* Offset from beginning of resource type list
* to reference list for this type */
public:
DEFINE_SIZE_STATIC (8);
};
struct ResourceMap
{
inline bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
if (unlikely (!c->check_struct (this)))
return_trace (false);
for (unsigned int i = 0; i < get_types_count (); ++i)
{
const ResourceTypeItem& type = get_type (i);
if (unlikely (!type.sanitize (c)))
return_trace (false);
for (unsigned int j = 0; j < type.get_resource_count (); ++j)
if (unlikely (!get_ref_item (type, j).sanitize (c)))
return_trace (false);
}
return_trace (true);
}
inline const ResourceTypeItem& get_type (unsigned int i) const
{
// Why offset from the second byte of the object? I'm not sure
return ((&reserved[2])+typeList)[i];
}
inline unsigned int get_types_count () const
{
return nTypes + 1;
}
inline const ResourceRefItem &get_ref_item (const ResourceTypeItem &type,
unsigned int i) const
{
return type.get_ref_item (&(this+typeList), i);
}
inline const PString& get_name (const ResourceRefItem &item,
unsigned int i) const
{
if (item.nameOffset == -1)
return Null (PString);
return StructAtOffset<PString> (this, nameList + item.nameOffset);
}
protected:
HBUINT8 reserved[16]; /* Reserved for copy of resource header */
LOffsetTo<ResourceMap>
reserved1; /* Reserved for handle to next resource map */
HBUINT16 reserved2; /* Reserved for file reference number */
HBUINT16 attr; /* Resource fork attribute */
OffsetTo<UnsizedArrayOf<ResourceTypeItem> >
typeList; /* Offset from beginning of map to
* resource type list */
HBUINT16 nameList; /* Offset from beginning of map to
* resource name list */
HBUINT16 nTypes; /* Number of types in the map minus 1 */
public:
DEFINE_SIZE_STATIC (30);
};
struct ResourceForkHeader
{
inline unsigned int get_face_count () const
{
const ResourceMap &resource_map = this+map;
for (unsigned int i = 0; i < resource_map.get_types_count (); ++i)
{
const ResourceTypeItem& type = resource_map.get_type (i);
if (type.is_sfnt ())
return type.get_resource_count ();
}
return 0;
}
inline const LArrayOf<HBUINT8>& get_data (const ResourceTypeItem& type,
unsigned int idx) const
{
const ResourceMap &resource_map = this+map;
unsigned int offset = dataOffset;
offset += resource_map.get_ref_item (type, idx).dataOffset;
return StructAtOffset<LArrayOf<HBUINT8> > (this, offset);
}
inline const OpenTypeFontFace& get_face (unsigned int idx) const
{
const ResourceMap &resource_map = this+map;
for (unsigned int i = 0; i < resource_map.get_types_count (); ++i)
{
const ResourceTypeItem& type = resource_map.get_type (i);
if (type.is_sfnt () && idx < type.get_resource_count ())
return (OpenTypeFontFace&) get_data (type, idx).arrayZ;
}
return Null (OpenTypeFontFace);
}
inline bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
if (unlikely (!c->check_struct (this)))
return_trace (false);
const ResourceMap &resource_map = this+map;
if (unlikely (!resource_map.sanitize (c)))
return_trace (false);
for (unsigned int i = 0; i < resource_map.get_types_count (); ++i)
{
const ResourceTypeItem& type = resource_map.get_type (i);
for (unsigned int j = 0; j < type.get_resource_count (); ++j)
{
const LArrayOf<HBUINT8>& data = get_data (type, j);
if (unlikely (!(data.sanitize (c) &&
((OpenTypeFontFace&) data.arrayZ).sanitize (c))))
return_trace (false);
}
}
return_trace (true);
}
protected:
HBUINT32 dataOffset; /* Offset from beginning of resource fork
* to resource data */
LOffsetTo<ResourceMap>
map; /* Offset from beginning of resource fork
* to resource map */
HBUINT32 dataLen; /* Length of resource data */
HBUINT32 mapLen; /* Length of resource map */
public:
DEFINE_SIZE_STATIC (16);
};
/*
* OpenType Font File
@ -299,6 +490,7 @@ struct OpenTypeFontFile
CFFTag = HB_TAG ('O','T','T','O'), /* OpenType with Postscript outlines */
TrueTypeTag = HB_TAG ( 0 , 1 , 0 , 0 ), /* OpenType with TrueType outlines */
TTCTag = HB_TAG ('t','t','c','f'), /* TrueType Collection */
DFontTag = HB_TAG ( 0 , 0 , 1 , 0 ), /* DFont Mac Resource Fork */
TrueTag = HB_TAG ('t','r','u','e'), /* Obsolete Apple TrueType */
Typ1Tag = HB_TAG ('t','y','p','1') /* Obsolete Apple Type1 font in SFNT container */
};
@ -313,6 +505,7 @@ struct OpenTypeFontFile
case Typ1Tag:
case TrueTypeTag: return 1;
case TTCTag: return u.ttcHeader.get_face_count ();
case DFontTag: return u.rfHeader.get_face_count ();
default: return 0;
}
}
@ -327,6 +520,7 @@ struct OpenTypeFontFile
case Typ1Tag:
case TrueTypeTag: return u.fontFace;
case TTCTag: return u.ttcHeader.get_face (i);
case DFontTag: return u.rfHeader.get_face (i);
default: return Null(OpenTypeFontFace);
}
}
@ -353,6 +547,7 @@ struct OpenTypeFontFile
case Typ1Tag:
case TrueTypeTag: return_trace (u.fontFace.sanitize (c));
case TTCTag: return_trace (u.ttcHeader.sanitize (c));
case DFontTag: return_trace (u.rfHeader.sanitize (c));
default: return_trace (true);
}
}
@ -362,6 +557,7 @@ struct OpenTypeFontFile
Tag tag; /* 4-byte identifier. */
OpenTypeFontFace fontFace;
TTCHeader ttcHeader;
ResourceForkHeader rfHeader;
} u;
public:
DEFINE_SIZE_UNION (4, tag);

1
src/hb-open-type-private.hh
View File

@ -1033,6 +1033,7 @@ struct ArrayOf
DEFINE_SIZE_ARRAY (sizeof (LenType), arrayZ);
};
template <typename Type> struct LArrayOf : ArrayOf<Type, HBUINT32> {};
typedef ArrayOf<HBUINT8, HBUINT8> PString;
/* Array of Offset's */
template <typename Type, typename OffsetType=HBUINT16>

3
src/main.cc
View File

@ -78,6 +78,9 @@ main (int argc, char **argv)
case OpenTypeFontFile::Typ1Tag:
printf ("Obsolete Apple Type1 font in SFNT container\n");
break;
case OpenTypeFontFile::DFontTag:
printf ("DFont Mac Resource Fork\n");
break;
default:
printf ("Unknown font format\n");
break;