{
/* validate entry in ligActionTable */
FT_ULong lig_action;
+#ifdef GXV_LOAD_UNUSED_VARS
FT_UShort last;
FT_UShort store;
+#endif
FT_ULong offset;
+ FT_Long gid_limit;
lig_action = FT_NEXT_ULONG( p );
+#ifdef GXV_LOAD_UNUSED_VARS
last = (FT_UShort)( ( lig_action >> 31 ) & 1 );
store = (FT_UShort)( ( lig_action >> 30 ) & 1 );
+#endif
offset = lig_action & 0x3FFFFFFFUL;
+
+ /* this offset is 30-bit signed value to add to GID */
+ /* it is different from the location offset in mort */
+ if ( ( offset & 0x3FFF0000UL ) == 0x3FFF0000UL )
+ { /* negative offset */
+ gid_limit = valid->face->num_glyphs - ( offset & 0x0000FFFFUL );
+ if ( gid_limit > 0 )
+ return;
+
+ GXV_TRACE(( "ligature action table includes"
+ " too negative offset moving all GID"
+ " below defined range: 0x%04x\n",
+ offset & 0xFFFFU ));
+ GXV_SET_ERR_IF_PARANOID( FT_INVALID_OFFSET );
+ }
+ else if ( ( offset & 0x3FFF0000UL ) == 0x0000000UL )
+ { /* positive offset */
+ if ( (FT_Long)offset < valid->face->num_glyphs )
+ return;
+
+ GXV_TRACE(( "ligature action table includes"
+ " too large offset moving all GID"
+ " over defined range: 0x%04x\n",
+ offset & 0xFFFFU ));
+ GXV_SET_ERR_IF_PARANOID( FT_INVALID_OFFSET );
+ }
+
+ GXV_TRACE(( "ligature action table includes"
+ " invalid offset to add to 16-bit GID:"
+ " 0x%08x\n", offset ));
+ GXV_SET_ERR_IF_PARANOID( FT_INVALID_OFFSET );
}
}
FT_Bytes limit,
GXV_Validator valid )
{
+#ifdef GXV_LOAD_UNUSED_VARS
FT_UShort setComponent;
FT_UShort dontAdvance;
FT_UShort performAction;
+#endif
FT_UShort reserved;
FT_UShort ligActionIndex;
FT_UNUSED( limit );
+#ifdef GXV_LOAD_UNUSED_VARS
setComponent = (FT_UShort)( ( flags >> 15 ) & 1 );
dontAdvance = (FT_UShort)( ( flags >> 14 ) & 1 );
performAction = (FT_UShort)( ( flags >> 13 ) & 1 );
+#endif
reserved = (FT_UShort)( flags & 0x1FFF );
ligActionIndex = glyphOffset_p->u;
GXV_LIMIT_CHECK( 2 );
lig_gid = FT_NEXT_USHORT( p );
+ if ( lig_gid < valid->face->num_glyphs )
+ GXV_SET_ERR_IF_PARANOID( FT_INVALID_GLYPH_ID );
}
}