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Because FT_Load_Glyph expects CID values for CID-keyed fonts, the 

test for a valid glyph index must be deferred to the font drivers.
This patch fixes Savannah bug #18301.

* src/base/ftobjs.c (FT_Load_Glyph): Don't check `glyph_index'.
* src/bdf/bdfdrivr.c (BDF_Glyph_Load), src/cff/cffgload.c
(cff_slot_load), src/cid/cidgload.c (cid_slot_load_glyph),
src/pcf/pcfdrivr.c (PCF_Glyph_Load), src/pfr/pfrobjs.c
(pfr_slot_load), src/truetype/ttdriver.c (Load_Glyph),
src/type1/t1gload.c (T1_Load_Glyph), src/winfonts/winfnt.c
(FNT_Load_Glyph): Check validity of `glyph_index'.
This commit is contained in:
Werner Lemberg 2006-11-19 09:19:17 +00:00
parent 0d0d78dadc
commit 913a365090
12 changed files with 82 additions and 27 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
ChangeLog
View File

@ -1,3 +1,17 @@
2006-11-18 Werner Lemberg <wl@gnu.org>
Because FT_Load_Glyph expects CID values for CID-keyed fonts, the
test for a valid glyph index must be deferred to the font drivers.
This patch fixes Savannah bug #18301.
* src/base/ftobjs.c (FT_Load_Glyph): Don't check `glyph_index'.
* src/bdf/bdfdrivr.c (BDF_Glyph_Load), src/cff/cffgload.c
(cff_slot_load), src/cid/cidgload.c (cid_slot_load_glyph),
src/pcf/pcfdrivr.c (PCF_Glyph_Load), src/pfr/pfrobjs.c
(pfr_slot_load), src/truetype/ttdriver.c (Load_Glyph),
src/type1/t1gload.c (T1_Load_Glyph), src/winfonts/winfnt.c
(FNT_Load_Glyph): Check validity of `glyph_index'.
2006-11-13 David Turner <david@freetype.org>
* src/truetype/ttinterp.c (FIX_BYTECODE): Undefine. The interpreter

21
src/base/ftcalc.c
View File

@ -315,6 +315,23 @@
/* documentation is in freetype.h */
/* The FT_MulDiv function has been optimized thanks to ideas from */
/* Graham Asher. The trick is to optimize computation when everything */
/* fits within 32-bits (a rather common case). */
/* */
/* we compute 'a*b+c/2', then divide it by 'c'. (positive values) */
/* */
/* 46340 is FLOOR(SQRT(2^31-1)). */
/* */
/* if ( a <= 46340 && b <= 46340 ) then ( a*b <= 0x7FFEA810 ) */
/* */
/* 0x7FFFFFFF - 0x7FFEA810 = 0x157F0 */
/* */
/* if ( c < 0x157F0*2 ) then ( a*b+c/2 <= 0x7FFFFFFF ) */
/* */
/* and 2*0x157F0 = 176096 */
/* */
FT_EXPORT_DEF( FT_Long )
FT_MulDiv( FT_Long a,
FT_Long b,
@ -551,7 +568,7 @@
/* apparently, the second version of this code is not compiled correctly */
/* on Mac machines with the MPW C compiler.. tsk, tsk, tsk... */
/* on Mac machines with the MPW C compiler.. tsk, tsk, tsk... */
#if 1
@ -588,7 +605,7 @@
if ( r >= (FT_UInt32)y ) /* we know y is to be treated as unsigned here */
return ( s < 0 ? 0x80000001UL : 0x7FFFFFFFUL );
/* Return Max/Min Int32 if division overflow. */
/* This includes division by zero! */
/* This includes division by zero! */
q = 0;
for ( i = 0; i < 32; i++ )
{

4
src/base/ftobjs.c
View File

@ -549,8 +549,8 @@
if ( !face || !face->size || !face->glyph )
return FT_Err_Invalid_Face_Handle;
if ( glyph_index >= (FT_UInt)face->num_glyphs )
return FT_Err_Invalid_Argument;
/* The validity test for `glyph_index' is performed by the */
/* font drivers. */
slot = face->glyph;
ft_glyphslot_clear( slot );

13
src/bdf/bdfdrivr.c
View File

@ -648,16 +648,17 @@ THE SOFTWARE.
FT_UInt glyph_index,
FT_Int32 load_flags )
{
BDF_Face face = (BDF_Face)FT_SIZE_FACE( size );
BDF_Face bdf = (BDF_Face)FT_SIZE_FACE( size );
FT_Face face = FT_FACE( bdf );
FT_Error error = BDF_Err_Ok;
FT_Bitmap* bitmap = &slot->bitmap;
bdf_glyph_t glyph;
int bpp = face->bdffont->bpp;
int bpp = bdf->bdffont->bpp;
FT_UNUSED( load_flags );
if ( !face )
if ( !face || glyph_index >= (FT_UInt)face->num_glyphs )
{
error = BDF_Err_Invalid_Argument;
goto Exit;
@ -665,12 +666,12 @@ THE SOFTWARE.
/* index 0 is the undefined glyph */
if ( glyph_index == 0 )
glyph_index = face->default_glyph;
glyph_index = bdf->default_glyph;
else
glyph_index--;
/* slot, bitmap => freetype, glyph => bdflib */
glyph = face->bdffont->glyphs[glyph_index];
glyph = bdf->bdffont->glyphs[glyph_index];
bitmap->rows = glyph.bbx.height;
bitmap->width = glyph.bbx.width;
@ -712,7 +713,7 @@ THE SOFTWARE.
* used here, provided such fonts do exist.
*/
ft_synthesize_vertical_metrics( &slot->metrics,
face->bdffont->bbx.height << 6 );
bdf->bdffont->bbx.height << 6 );
Exit:
return error;

26
src/cff/cffgload.c
View File

@ -2285,6 +2285,20 @@
FT_Vector font_offset;
/* in a CID-keyed font, consider `glyph_index' as a CID and map */
/* it immediately to the real glyph_index -- if it isn't a */
/* subsetted font, glyph_indices and CIDs are identical, though */
if ( cff->top_font.font_dict.cid_registry != 0xFFFFU &&
cff->charset.cids )
{
if ( glyph_index < cff->charset.max_cid )
glyph_index = cff->charset.cids[glyph_index];
else
return CFF_Err_Invalid_Argument;
}
else if ( glyph_index >= cff->num_glyphs )
return CFF_Err_Invalid_Argument;
if ( load_flags & FT_LOAD_NO_RECURSE )
load_flags |= FT_LOAD_NO_SCALE | FT_LOAD_NO_HINTING;
@ -2376,18 +2390,6 @@
FT_ULong charstring_len;
/* in a CID-keyed font, consider `glyph_index' as a CID and map */
/* it immediately to the real glyph_index -- if it isn't a */
/* subsetted font, glyph_indices and CIDs are identical, though */
if ( cff->top_font.font_dict.cid_registry != 0xFFFFU &&
cff->charset.cids )
{
if ( glyph_index < cff->charset.max_cid )
glyph_index = cff->charset.cids[glyph_index];
else
glyph_index = 0;
}
cff_decoder_init( &decoder, face, size, glyph, hinting,
FT_LOAD_TARGET_MODE( load_flags ) );

3
src/cff/cffload.c
View File

@ -1946,7 +1946,8 @@
encoding->count = 0;
error = cff_charset_compute_cids( charset, num_glyphs, stream->memory );
error = cff_charset_compute_cids( charset, num_glyphs,
stream->memory );
if ( error )
goto Exit;

6
src/cid/cidgload.c
View File

@ -275,6 +275,12 @@
FT_Vector font_offset;
if ( glyph_index >= (FT_UInt)face->root.num_glyphs )
{
error = CID_Err_Invalid_Argument;
goto Exit;
}
if ( load_flags & FT_LOAD_NO_RECURSE )
load_flags |= FT_LOAD_NO_SCALE | FT_LOAD_NO_HINTING;

2
src/pcf/pcfdrivr.c
View File

@ -442,7 +442,7 @@ THE SOFTWARE.
FT_TRACE4(( "load_glyph %d ---", glyph_index ));
if ( !face )
if ( !face || glyph_index >= (FT_UInt)face->root.num_glyphs )
{
error = PCF_Err_Invalid_Argument;
goto Exit;

7
src/pfr/pfrobjs.c
View File

@ -296,8 +296,11 @@
if ( gindex > 0 )
gindex--;
/* check that the glyph index is correct */
FT_ASSERT( gindex < face->phy_font.num_chars );
if ( !face || gindex >= face->phy_font.num_chars )
{
error = PFR_Err_Invalid_Argument;
goto Exit;
}
/* try to load an embedded bitmap */
if ( ( load_flags & ( FT_LOAD_NO_SCALE | FT_LOAD_NO_BITMAP ) ) == 0 )

4
src/truetype/ttdriver.c
View File

@ -243,6 +243,7 @@
{
TT_GlyphSlot slot = (TT_GlyphSlot)ttslot;
TT_Size size = (TT_Size)ttsize;
FT_Face face = ttslot->face;
FT_Error error;
@ -252,6 +253,9 @@
if ( !size )
return TT_Err_Invalid_Size_Handle;
if ( !face || glyph_index >= (FT_UInt)face->num_glyphs )
return TT_Err_Invalid_Argument;
if ( load_flags & ( FT_LOAD_NO_RECURSE | FT_LOAD_NO_SCALE ) )
{
load_flags |= FT_LOAD_NO_HINTING |

6
src/type1/t1gload.c
View File

@ -225,6 +225,12 @@
#endif
if ( glyph_index >= (FT_UInt)face->root.num_glyphs )
{
error = T1_Err_Invalid_Argument;
goto Exit;
}
FT_ASSERT( ( face->len_buildchar == 0 ) == ( face->buildchar == NULL ) );
if ( load_flags & FT_LOAD_NO_RECURSE )

3
src/winfonts/winfnt.c
View File

@ -649,7 +649,8 @@
FT_UNUSED( load_flags );
if ( !face || !font )
if ( !face || !font ||
glyph_index >= (FT_UInt)( FT_FACE( face )->num_glyphs ) )
{
error = FNT_Err_Invalid_Argument;
goto Exit;