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[psaux] Fix potential sign extension problems. 

When shifting right a signed value, it is not defined by the
C standard whether one gets a sign extension or not.  Use a macro to
do an explicit cast from a signed short (assuming that this is
16bit) to an int.

* src/psaux/t1decode.c (Fix2Int): New macro.
Use it where appropriate.
This commit is contained in:
Matthias Drochner 2011-07-14 07:35:51 +02:00 committed by Werner Lemberg
parent 60f8371353
commit 143799d4a9
2 changed files with 24 additions and 9 deletions
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12
ChangeLog
View File

@ -1,3 +1,15 @@
2011-07-14 Matthias Drochner <M.Drochner@fz-juelich.de>.
[psaux] Fix potential sign extension problems.
When shifting right a signed value, it is not defined by the
C standard whether one gets a sign extension or not. Use a macro to
do an explicit cast from a signed short (assuming that this is
16bit) to an int.
* src/psaux/t1decode.c (Fix2Int): New macro.
Use it where appropriate.
2011-07-14 Werner Lemberg <wl@gnu.org>
* src/psaux/t1decode.c (t1_decoder_parse_charstrings)

21
src/psaux/t1decode.c
View File

@ -27,6 +27,8 @@
#include "psauxerr.h"
/* ensure proper sign extension */
#define Fix2Int( f ) ( (FT_Int)(FT_Short)( (f) >> 16 ) )
/*************************************************************************/
/* */
@ -661,7 +663,7 @@
if ( large_int )
FT_TRACE4(( " %ld", value ));
else
FT_TRACE4(( " %ld", (FT_Int32)( value >> 16 ) ));
FT_TRACE4(( " %ld", Fix2Int( value ) ));
#endif
*top++ = value;
@ -683,8 +685,8 @@
top -= 2;
subr_no = (FT_Int)( top[1] >> 16 );
arg_cnt = (FT_Int)( top[0] >> 16 );
subr_no = Fix2Int( top[1] );
arg_cnt = Fix2Int( top[0] );
/***********************************************************/
/* */
@ -862,7 +864,7 @@
if ( arg_cnt != 1 || blend == NULL )
goto Unexpected_OtherSubr;
idx = (FT_Int)( top[0] >> 16 );
idx = Fix2Int( top[0] );
if ( idx < 0 ||
idx + blend->num_designs > decoder->len_buildchar )
@ -930,7 +932,7 @@
if ( arg_cnt != 2 || blend == NULL )
goto Unexpected_OtherSubr;
idx = (FT_Int)( top[1] >> 16 );
idx = Fix2Int( top[1] );
if ( idx < 0 || (FT_UInt) idx >= decoder->len_buildchar )
goto Unexpected_OtherSubr;
@ -951,7 +953,7 @@
if ( arg_cnt != 1 || blend == NULL )
goto Unexpected_OtherSubr;
idx = (FT_Int)( top[0] >> 16 );
idx = Fix2Int( top[0] );
if ( idx < 0 || (FT_UInt) idx >= decoder->len_buildchar )
goto Unexpected_OtherSubr;
@ -1017,6 +1019,7 @@
unknown_othersubr_result_cnt = arg_cnt;
break;
}
/* fall through */
Unexpected_OtherSubr:
FT_ERROR(( "t1_decoder_parse_charstrings:"
@ -1142,8 +1145,8 @@
top[0],
top[1],
top[2],
(FT_Int)( top[3] >> 16 ),
(FT_Int)( top[4] >> 16 ) );
Fix2Int( top[3] ),
Fix2Int( top[4] ) );
case op_sbw:
FT_TRACE4(( " sbw" ));
@ -1327,7 +1330,7 @@
FT_TRACE4(( " callsubr" ));
idx = (FT_Int)( top[0] >> 16 );
idx = Fix2Int( top[0] );
if ( idx < 0 || idx >= (FT_Int)decoder->num_subrs )
{
FT_ERROR(( "t1_decoder_parse_charstrings:"