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Properly define separate structs for TTCHeader and TTCHeaderVersion1

This commit is contained in:
Behdad Esfahbod 2010-04-23 12:33:02 -04:00
parent a065f471b3
commit ae4190cafe
1 changed files with 55 additions and 16 deletions
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71
src/hb-open-file-private.hh
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@ -65,7 +65,6 @@ ASSERT_SIZE (TableDirectory, 16);
typedef struct OffsetTable
{
friend struct OpenTypeFontFile;
friend struct TTCHeader;
STATIC_DEFINE_GET_FOR_DATA (OffsetTable);
@ -127,31 +126,71 @@ ASSERT_SIZE_VAR (OffsetTable, 12, TableDirectory);
* TrueType Collections
*/
struct TTCHeader
struct TTCHeaderVersion1
{
friend struct OpenTypeFontFile;
STATIC_DEFINE_GET_FOR_DATA_CHECK_MAJOR_VERSION (TTCHeader, 1, 2);
friend struct TTCHeader;
inline unsigned int get_face_count (void) const { return table.len; }
inline const OpenTypeFontFace& get_face (unsigned int i) const { return this+table[i]; }
inline bool sanitize (SANITIZE_ARG_DEF) {
TRACE_SANITIZE ();
if (!SANITIZE (version)) return false;
if (HB_UNLIKELY (version.major < 1 || version.major > 2)) return false;
return HB_LIKELY (table.sanitize (SANITIZE_ARG, CharP(this), CharP(this)));
}
private:
Tag ttcTag; /* TrueType Collection ID string: 'ttcf' */
FixedVersion version; /* Version of the TTC Header (1.0 or 2.0),
* 0x00010000 or 0x00020000 */
FixedVersion version; /* Version of the TTC Header (1.0),
* 0x00010000 */
LongOffsetLongArrayOf<OffsetTable>
table; /* Array of offsets to the OffsetTable for each font
* from the beginning of the file */
};
ASSERT_SIZE (TTCHeader, 12);
ASSERT_SIZE (TTCHeaderVersion1, 12);
struct TTCHeader
{
friend struct OpenTypeFontFile;
private:
inline unsigned int get_face_count (void) const
{
switch (u.header.version) {
case 2: /* version 2 is compatible with version 1 */
case 1: return u.version1->get_face_count ();
default:return 0;
}
}
inline const OpenTypeFontFace& get_face (unsigned int i) const
{
switch (u.header.version) {
case 2: /* version 2 is compatible with version 1 */
case 1: return u.version1->get_face (i);
default: return Null(OpenTypeFontFace);
}
}
inline bool sanitize (SANITIZE_ARG_DEF) {
TRACE_SANITIZE ();
if (!SANITIZE (u.header.version)) return false;
switch (u.header.version) {
case 2: /* version 2 is compatible with version 1 */
case 1: return u.version1->sanitize (SANITIZE_ARG);
default:return true;
}
}
private:
union {
struct {
Tag ttcTag; /* TrueType Collection ID string: 'ttcf' */
FixedVersion version; /* Version of the TTC Header (1.0 or 2.0),
* 0x00010000 or 0x00020000 */
} header;
TTCHeaderVersion1 version1[VAR];
} u;
};
/*
@ -169,20 +208,20 @@ struct OpenTypeFontFile
inline unsigned int get_face_count (void) const
{
switch (tag) {
case TrueTypeTag: case CFFTag: return Cast<OpenTypeFontFace> (*this).get_face_count ();
case TTCTag: return Cast<TTCHeader> (*this).get_face_count ();
default: return 0;
case TrueTypeTag: case CFFTag: return OffsetTable::get_for_data (CharP(this)).get_face_count ();
case TTCTag: return TTCHeader::get_for_data (CharP(this)).get_face_count ();
}
}
inline const OpenTypeFontFace& get_face (unsigned int i) const
{
switch (tag) {
default: return Null(OpenTypeFontFace);
/* Note: for non-collection SFNT data we ignore index. This is because
* Apple dfont container is a container of SFNT's. So each SFNT is a
* non-TTC, but the index is more than zero. */
case TrueTypeTag: case CFFTag: return OffsetTable::get_for_data (CharP(this));
case TTCTag: return TTCHeader::get_for_data (CharP(this)).get_face (i);
case TrueTypeTag: case CFFTag: return Cast<OpenTypeFontFace> (*this);
case TTCTag: return Cast<TTCHeader> (*this).get_face (i);
default: return Null(OpenTypeFontFace);
}
}
@ -191,7 +230,7 @@ struct OpenTypeFontFile
if (!SANITIZE_SELF ()) return false;
switch (tag) {
default: return true;
case TrueTypeTag: case CFFTag: return SANITIZE_THIS (Cast<OffsetTable> (*this));
case TrueTypeTag: case CFFTag: return SANITIZE_THIS (Cast<OpenTypeFontFace> (*this));
case TTCTag: return SANITIZE (Cast<TTCHeader> (*this));
}
}