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* src/sfnt/sfobjs.c (sfnt_init_face): Check that format_tag is known 

before loading the table directory.

* src/sfnt/ttload.c (tt_face_load_sfnt_header,
tt_face_load_directory): Delay sfnt_dir_check from
tt_face_load_sfnt_header to tt_face_load_directory.
This commit is contained in:
Wu, Chia-I (吳佳一) 2005-11-21 03:04:03 +00:00
parent 6f1eca0460
commit d81947e429
3 changed files with 31 additions and 11 deletions
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9
ChangeLog
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@ -1,3 +1,12 @@
2005-11-21 Chia-I Wu <b90201047@ntu.edu.tw>
* src/sfnt/sfobjs.c (sfnt_init_face): Check that format_tag is known
before loading the table directory.
* src/sfnt/ttload.c (tt_face_load_sfnt_header,
tt_face_load_directory): Delay sfnt_dir_check from
tt_face_load_sfnt_header to tt_face_load_directory.
2005-11-20 Chia-I Wu <b90201047@ntu.edu.tw> 2005-11-20 Chia-I Wu <b90201047@ntu.edu.tw>
* src/sfnt/ttload.c (sfnt_dir_check): Clean up and return correct * src/sfnt/ttload.c (sfnt_dir_check): Clean up and return correct

7
src/sfnt/sfobjs.c
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@ -376,6 +376,13 @@
if ( error ) if ( error )
goto Exit; goto Exit;
if ( sfnt_header.format_tag != 0x00010000UL &&
sfnt_header.format_tag != TTAG_ttcf &&
sfnt_header.format_tag != FT_MAKE_TAG( 'O', 'T', 'T', 'O' ) &&
sfnt_header.format_tag != TTAG_true &&
sfnt_header.format_tag != 0x00020000UL )
return SFNT_Err_Unknown_File_Format;
face->format_tag = sfnt_header.format_tag; face->format_tag = sfnt_header.format_tag;
face->num_tables = sfnt_header.num_tables; face->num_tables = sfnt_header.num_tables;

26
src/sfnt/ttload.c
View File

@ -134,13 +134,7 @@
} }
/* In theory, we should check the values of `search_range', */ /* Here, we: */
/* `entry_selector', and `range_shift' to detect non-SFNT based files */
/* whose header might also start with 0x100000L (yes, these exist). */
/* */
/* Very unfortunately, many TrueType fonts don't have these fields */
/* set correctly and we must ignore them to support them. An */
/* alternative way to check the font file is thus to: */
/* */ /* */
/* - check that `num_tables' is valid */ /* - check that `num_tables' is valid */
/* - look for a "head" table, check its size, and parse it to */ /* - look for a "head" table, check its size, and parse it to */
@ -381,10 +375,12 @@
FT_STREAM_READ_FIELDS( sfnt_header_fields, sfnt ) ) FT_STREAM_READ_FIELDS( sfnt_header_fields, sfnt ) )
return error; return error;
/* now check the sfnt directory */ /* many fonts don't have these fields set correctly */
error = sfnt_dir_check( sfnt, stream ); #if 0
if ( error ) if ( sfnt->search_range != 1 << ( sfnt->entry_selector + 4 ) ||
FT_TRACE2(( "tt_face_load_sfnt_header: invalid SFNT!\n" )); sfnt->search_range + sfnt->range_shift != sfnt->num_tables << 4 )
return SFNT_Err_Unknown_File_Format;
#endif
return error; return error;
} }
@ -428,6 +424,14 @@
FT_TRACE2(( "-- Tables count: %12u\n", sfnt->num_tables )); FT_TRACE2(( "-- Tables count: %12u\n", sfnt->num_tables ));
FT_TRACE2(( "-- Format version: %08lx\n", sfnt->format_tag )); FT_TRACE2(( "-- Format version: %08lx\n", sfnt->format_tag ));
/* check first */
error = sfnt_dir_check( sfnt, stream );
if ( error ) {
FT_TRACE2(( "tt_face_load_directory: directory checking failed!\n" ));
return error;
}
face->num_tables = sfnt->num_tables; face->num_tables = sfnt->num_tables;
if ( FT_QNEW_ARRAY( face->dir_tables, face->num_tables ) ) if ( FT_QNEW_ARRAY( face->dir_tables, face->num_tables ) )