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* src/sfnt/sfdriver.c, src/sfnt/ttbdf.c: Clean up interface.

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Ensure that all driver functions use the signature of the service or driver.
This avoids pointer mismatches, which are technically undefined behaviour.
Recent compilers are more picky in catching them as part of Control Flow
Integrity tests.

* src/sfnt/sfdriver.c (sfnt_load_table): New wrapper function.
(sfnt_service_sfnt_table): Use it.
gsoc-anurag-2023-docs-final
Werner Lemberg 2 years ago
parent ceba488cf8
commit e245951c43
3 changed files with 66 additions and 44 deletions
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  1. 97
      src/sfnt/sfdriver.c
  2. 11
      src/sfnt/ttbdf.c
  3. 2
      src/sfnt/ttbdf.h

97
src/sfnt/sfdriver.c
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@ -79,41 +79,57 @@
*
*/
static void*
get_sfnt_table( TT_Face face,
FT_CALLBACK_DEF( FT_Error )
sfnt_load_table( FT_Face face, /* TT_Face */
FT_ULong tag,
FT_Long offset,
FT_Byte* buffer,
FT_ULong* length )
{
TT_Face ttface = (TT_Face)face;
return tt_face_load_any( ttface, tag, offset, buffer, length );
}
FT_CALLBACK_DEF( void* )
get_sfnt_table( FT_Face face, /* TT_Face */
FT_Sfnt_Tag tag )
{
TT_Face ttface = (TT_Face)face;
void* table;
switch ( tag )
{
case FT_SFNT_HEAD:
table = &face->header;
table = &ttface->header;
break;
case FT_SFNT_HHEA:
table = &face->horizontal;
table = &ttface->horizontal;
break;
case FT_SFNT_VHEA:
table = face->vertical_info ? &face->vertical : NULL;
table = ttface->vertical_info ? &ttface->vertical : NULL;
break;
case FT_SFNT_OS2:
table = ( face->os2.version == 0xFFFFU ) ? NULL : &face->os2;
table = ( ttface->os2.version == 0xFFFFU ) ? NULL : &ttface->os2;
break;
case FT_SFNT_POST:
table = &face->postscript;
table = &ttface->postscript;
break;
case FT_SFNT_MAXP:
table = &face->max_profile;
table = &ttface->max_profile;
break;
case FT_SFNT_PCLT:
table = face->pclt.Version ? &face->pclt : NULL;
table = ttface->pclt.Version ? &ttface->pclt : NULL;
break;
default:
@ -124,26 +140,29 @@
}
static FT_Error
sfnt_table_info( TT_Face face,
FT_CALLBACK_DEF( FT_Error )
sfnt_table_info( FT_Face face, /* TT_Face */
FT_UInt idx,
FT_ULong *tag,
FT_ULong *offset,
FT_ULong *length )
{
TT_Face ttface = (TT_Face)face;
if ( !offset || !length )
return FT_THROW( Invalid_Argument );
if ( !tag )
*length = face->num_tables;
*length = ttface->num_tables;
else
{
if ( idx >= face->num_tables )
if ( idx >= ttface->num_tables )
return FT_THROW( Table_Missing );
*tag = face->dir_tables[idx].Tag;
*offset = face->dir_tables[idx].Offset;
*length = face->dir_tables[idx].Length;
*tag = ttface->dir_tables[idx].Tag;
*offset = ttface->dir_tables[idx].Offset;
*length = ttface->dir_tables[idx].Length;
}
return FT_Err_Ok;
@ -153,7 +172,7 @@
FT_DEFINE_SERVICE_SFNT_TABLEREC(
sfnt_service_sfnt_table,
(FT_SFNT_TableLoadFunc)tt_face_load_any, /* load_table */
(FT_SFNT_TableLoadFunc)sfnt_load_table, /* load_table */
(FT_SFNT_TableGetFunc) get_sfnt_table, /* get_table */
(FT_SFNT_TableInfoFunc)sfnt_table_info /* table_info */
)
@ -166,7 +185,7 @@
*
*/
static FT_Error
FT_CALLBACK_DEF( FT_Error )
sfnt_get_glyph_name( FT_Face face,
FT_UInt glyph_index,
FT_Pointer buffer,
@ -184,7 +203,7 @@
}
static FT_UInt
FT_CALLBACK_DEF( FT_UInt )
sfnt_get_name_index( FT_Face face,
const FT_String* glyph_name )
{
@ -600,7 +619,7 @@
}
static FT_Bool
FT_CALLBACK_DEF( FT_Bool )
sfnt_get_name_id( TT_Face face,
FT_UShort id,
FT_Int *win,
@ -1043,47 +1062,49 @@
#endif /* TT_CONFIG_OPTION_GX_VAR_SUPPORT */
static const char*
sfnt_get_ps_name( TT_Face face )
FT_CALLBACK_DEF( const char* )
sfnt_get_ps_name( FT_Face face ) /* TT_Face */
{
TT_Face ttface = (TT_Face)face;
FT_Int found, win, apple;
const char* result = NULL;
if ( face->postscript_name )
return face->postscript_name;
if ( ttface->postscript_name )
return ttface->postscript_name;
#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
if ( face->blend &&
( FT_IS_NAMED_INSTANCE( FT_FACE( face ) ) ||
FT_IS_VARIATION( FT_FACE( face ) ) ) )
if ( ttface->blend &&
( FT_IS_NAMED_INSTANCE( face ) ||
FT_IS_VARIATION( face ) ) )
{
face->postscript_name = sfnt_get_var_ps_name( face );
return face->postscript_name;
ttface->postscript_name = sfnt_get_var_ps_name( ttface );
return ttface->postscript_name;
}
#endif
/* scan the name table to see whether we have a Postscript name here, */
/* either in Macintosh or Windows platform encodings */
found = sfnt_get_name_id( face, TT_NAME_ID_PS_NAME, &win, &apple );
found = sfnt_get_name_id( ttface, TT_NAME_ID_PS_NAME, &win, &apple );
if ( !found )
return NULL;
/* prefer Windows entries over Apple */
if ( win != -1 )
result = get_win_string( face->root.memory,
face->name_table.stream,
face->name_table.names + win,
result = get_win_string( FT_FACE_MEMORY( face ),
ttface->name_table.stream,
ttface->name_table.names + win,
sfnt_is_postscript,
1 );
if ( !result && apple != -1 )
result = get_apple_string( face->root.memory,
face->name_table.stream,
face->name_table.names + apple,
result = get_apple_string( FT_FACE_MEMORY( face ),
ttface->name_table.stream,
ttface->name_table.names + apple,
sfnt_is_postscript,
1 );
face->postscript_name = result;
ttface->postscript_name = result;
return result;
}
@ -1109,7 +1130,7 @@
#ifdef TT_CONFIG_OPTION_BDF
static FT_Error
sfnt_get_charset_id( TT_Face face,
sfnt_get_charset_id( FT_Face face,
const char* *acharset_encoding,
const char* *acharset_registry )
{

11
src/sfnt/ttbdf.c
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@ -136,13 +136,14 @@
FT_LOCAL_DEF( FT_Error )
tt_face_find_bdf_prop( TT_Face face,
tt_face_find_bdf_prop( FT_Face face, /* TT_Face */
const char* property_name,
BDF_PropertyRec *aprop )
{
TT_BDF bdf = &face->bdf;
FT_Size size = FT_FACE( face )->size;
FT_Error error = FT_Err_Ok;
TT_Face ttface = (TT_Face)face;
TT_BDF bdf = &ttface->bdf;
FT_Size size = FT_FACE_SIZE( face );
FT_Error error = FT_Err_Ok;
FT_Byte* p;
FT_UInt count;
FT_Byte* strike;
@ -153,7 +154,7 @@
if ( bdf->loaded == 0 )
{
error = tt_face_load_bdf_props( face, FT_FACE( face )->stream );
error = tt_face_load_bdf_props( ttface, FT_FACE_STREAM( face ) );
if ( error )
goto Exit;
}

2
src/sfnt/ttbdf.h
Unescape View File

@ -34,7 +34,7 @@ FT_BEGIN_HEADER
FT_LOCAL( FT_Error )
tt_face_find_bdf_prop( TT_Face face,
tt_face_find_bdf_prop( FT_Face face,
const char* property_name,
BDF_PropertyRec *aprop );

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