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Code Issues 4 Releases Wiki Activity

* src/otvalid/otvgsub.c (otv_SingleSubst_validate): Fix format 1 handling. 

Fixes #1181.
This commit is contained in:
Werner Lemberg 2022-09-15 09:14:06 +02:00
parent 8e68439a6f
commit a0d1536452
1 changed files with 15 additions and 5 deletions
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20
src/otvalid/otvgsub.c
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@ -61,7 +61,8 @@
{
FT_Bytes Coverage;
FT_Int DeltaGlyphID;
FT_Long idx;
FT_UInt first_cov, last_cov;
FT_UInt first_idx, last_idx;
OTV_LIMIT_CHECK( 4 );
@ -70,12 +71,21 @@
otv_Coverage_validate( Coverage, otvalid, -1 );
idx = (FT_Long)otv_Coverage_get_first( Coverage ) + DeltaGlyphID;
if ( idx < 0 )
first_cov = otv_Coverage_get_first( Coverage );
last_cov = otv_Coverage_get_last( Coverage );
/* These additions are modulo 65536. */
first_idx = (FT_UInt)( (FT_Int)first_cov + DeltaGlyphID ) & 0xFFFFU;
last_idx = (FT_UInt)( (FT_Int)last_cov + DeltaGlyphID ) & 0xFFFFU;
/* Since the maximum number of glyphs is 2^16 - 1 = 65535, */
/* the largest possible glyph index is 65534. For this */
/* reason there can't be a wrap-around region, which would */
/* imply the use of the invalid glyph index 65535. */
if ( first_idx > last_idx )
FT_INVALID_DATA;
idx = (FT_Long)otv_Coverage_get_last( Coverage ) + DeltaGlyphID;
if ( (FT_UInt)idx >= otvalid->glyph_count )
if ( last_idx >= otvalid->glyph_count )
FT_INVALID_DATA;
}
break;