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[truetype] Refine some GX sanity tests. 

Use the `gvar' table size instead of the remaining bytes in the
stream.

* src/truetype/ttgxvar.h (GX_BlendRec): New field `gvar_size'.

* src/truetype/ttgxvar.c (ft_var_load_gvar): Set `gvar_size'.
(ft_var_readpackedpoints, ft_var_readpackeddeltas: New argument
`size'.
(tt_face_vary_cvt, TT_Vary_Apply_Glyph_Deltas): Updated.
This commit is contained in:
Werner Lemberg 2015-10-13 11:18:55 +02:00
parent 052f6c5649
commit 43a96eb26f
3 changed files with 38 additions and 6 deletions
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14
ChangeLog
View File

@ -1,3 +1,17 @@
2015-10-13 Werner Lemberg <wl@gnu.org>
[truetype] Refine some GX sanity tests.
Use the `gvar' table size instead of the remaining bytes in the
stream.
* src/truetype/ttgxvar.h (GX_BlendRec): New field `gvar_size'.
* src/truetype/ttgxvar.c (ft_var_load_gvar): Set `gvar_size'.
(ft_var_readpackedpoints, ft_var_readpackeddeltas: New argument
`size'.
(tt_face_vary_cvt, TT_Vary_Apply_Glyph_Deltas): Updated.
2015-10-13 Werner Lemberg <wl@gnu.org>
[truetype] Another GX sanity test.

28
src/truetype/ttgxvar.c
View File

@ -112,6 +112,8 @@
/* <Input> */
/* stream :: The data stream. */
/* */
/* size :: The size of the table holding the data. */
/* */
/* <Output> */
/* point_cnt :: The number of points read. A zero value means that */
/* all points in the glyph will be affected, without */
@ -123,6 +125,7 @@
/* */
static FT_UShort*
ft_var_readpackedpoints( FT_Stream stream,
FT_ULong size,
FT_UInt *point_cnt )
{
FT_UShort *points = NULL;
@ -149,7 +152,7 @@
n |= FT_GET_BYTE();
}
if ( n > stream->size - stream->pos )
if ( n > size )
{
FT_TRACE1(( "ft_var_readpackedpoints: number of points too large\n" ));
return NULL;
@ -218,6 +221,8 @@
/* <Input> */
/* stream :: The data stream. */
/* */
/* size :: The size of the table holding the data. */
/* */
/* delta_cnt :: The number of deltas to be read. */
/* */
/* <Return> */
@ -228,6 +233,7 @@
/* */
static FT_Short*
ft_var_readpackeddeltas( FT_Stream stream,
FT_ULong size,
FT_UInt delta_cnt )
{
FT_Short *deltas = NULL;
@ -239,7 +245,7 @@
FT_UNUSED( error );
if ( delta_cnt > stream->size - stream->pos )
if ( delta_cnt > size )
{
FT_TRACE1(( "ft_var_readpackeddeltas: number of points too large\n" ));
return NULL;
@ -497,6 +503,7 @@
FT_TRACE2(( "loaded\n" ));
blend->gvar_size = table_len;
blend->tuplecount = gvar_head.globalCoordCount;
blend->gv_glyphcnt = gvar_head.glyphCount;
offsetToData = gvar_start + gvar_head.offsetToData;
@ -1466,8 +1473,11 @@
FT_Stream_SeekSet( stream, offsetToData );
localpoints = ft_var_readpackedpoints( stream, &point_count );
localpoints = ft_var_readpackedpoints( stream,
table_len,
&point_count );
deltas = ft_var_readpackeddeltas( stream,
table_len,
point_count == 0 ? face->cvt_size
: point_count );
if ( localpoints == NULL || deltas == NULL )
@ -1867,7 +1877,7 @@
offsetToData = FT_GET_USHORT();
/* rough sanity test */
if ( offsetToData + tupleCount * 4 > stream->size - stream->pos )
if ( offsetToData + tupleCount * 4 > blend->gvar_size )
{
FT_TRACE2(( "TT_Vary_Apply_Glyph_Deltas:"
" invalid glyph variation array header\n" ));
@ -1884,7 +1894,9 @@
FT_Stream_SeekSet( stream, offsetToData );
sharedpoints = ft_var_readpackedpoints( stream, &spoint_count );
sharedpoints = ft_var_readpackedpoints( stream,
blend->gvar_size,
&spoint_count );
offsetToData = FT_Stream_FTell( stream );
FT_Stream_SeekSet( stream, here );
@ -1951,7 +1963,9 @@
{
FT_Stream_SeekSet( stream, offsetToData );
localpoints = ft_var_readpackedpoints( stream, &point_count );
localpoints = ft_var_readpackedpoints( stream,
blend->gvar_size,
&point_count );
points = localpoints;
}
else
@ -1961,9 +1975,11 @@
}
deltas_x = ft_var_readpackeddeltas( stream,
blend->gvar_size,
point_count == 0 ? n_points
: point_count );
deltas_y = ft_var_readpackeddeltas( stream,
blend->gvar_size,
point_count == 0 ? n_points
: point_count );

2
src/truetype/ttgxvar.h
View File

@ -95,6 +95,8 @@ FT_BEGIN_HEADER
FT_UInt gv_glyphcnt;
FT_ULong* glyphoffsets;
FT_ULong gvar_size;
} GX_BlendRec;