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Avoid undefined left-shifts. 

We really have to use double casts to avoid issues with C's and C++'s
signedness propagation rules in implicit casts.

Reported as

  https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=41178
  https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=41182

* include/freetype/config/public-macros.h (FT_STATIC_CAST,
FT_REINTERPRET_CAST): Modify macro to take two arguments.
Update all callers.
(FT_STATIC_BYTE_CAST): New macro.

* include/freetype/freetype.h (FT_ENC_TAG): Use `FT_STATIC_BYTE_CAST`.
* include/freetype/ftimage.h (FT_IMAGE_TAG): Ditto.
* include/freetype/fttypes.h (FT_MAKE_TAG): Ditto.
Use `FT_Tag` for casting.

* src/ftraster/ftmisc.h (FT_MAKE_TAG): Removed, no longer needed.
(FT_STATIC_BYTE_CAST): New macro.

* src/smooth/ftgrays.c (FT_STATIC_CAST): Replace with...
(FT_STATIC_BYTE_CAST): ... this.
This commit is contained in:
Werner Lemberg 2021-11-19 21:50:22 +01:00
parent 9079c5d91a
commit 8c8f51c558
7 changed files with 37 additions and 34 deletions
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13
include/freetype/config/public-macros.h
View File

@ -120,11 +120,16 @@ FT_BEGIN_HEADER
* Support for casts in both C and C++.
*/
#ifdef __cplusplus
#define FT_STATIC_CAST( type ) static_cast<type>
#define FT_REINTERPRET_CAST( type ) reinterpret_cast<type>
#define FT_STATIC_CAST( type, var ) static_cast<type>(var)
#define FT_REINTERPRET_CAST( type, var ) reinterpret_cast<type>(var)
#define FT_STATIC_BYTE_CAST( type, var ) \
static_cast<type>( static_cast<unsigned char>( var ) )
#else
#define FT_STATIC_CAST( type ) (type)
#define FT_REINTERPRET_CAST( type ) (type)
#define FT_STATIC_CAST( type, var ) (type)(var)
#define FT_REINTERPRET_CAST( type, var ) (type)(var)
#define FT_STATIC_BYTE_CAST( type, var ) (type)(unsigned char)(var)
#endif

16
include/freetype/freetype.h
View File

@ -617,11 +617,11 @@ FT_BEGIN_HEADER
#ifndef FT_ENC_TAG
#define FT_ENC_TAG( value, a, b, c, d ) \
value = ( ( FT_STATIC_CAST( FT_Byte )(a) << 24 ) | \
( FT_STATIC_CAST( FT_Byte )(b) << 16 ) | \
( FT_STATIC_CAST( FT_Byte )(c) << 8 ) | \
FT_STATIC_CAST( FT_Byte )(d) )
#define FT_ENC_TAG( value, a, b, c, d ) \
value = ( ( FT_STATIC_BYTE_CAST( FT_UInt32, a ) << 24 ) | \
( FT_STATIC_BYTE_CAST( FT_UInt32, b ) << 16 ) | \
( FT_STATIC_BYTE_CAST( FT_UInt32, c ) << 8 ) | \
FT_STATIC_BYTE_CAST( FT_UInt32, d ) )
#endif /* FT_ENC_TAG */
@ -3182,7 +3182,7 @@ FT_BEGIN_HEADER
* necessary to empty the cache after a mode switch to avoid false hits.
*
*/
#define FT_LOAD_TARGET_( x ) ( FT_STATIC_CAST( FT_Int32 )( (x) & 15 ) << 16 )
#define FT_LOAD_TARGET_( x ) ( FT_STATIC_CAST( FT_Int32, (x) & 15 ) << 16 )
#define FT_LOAD_TARGET_NORMAL FT_LOAD_TARGET_( FT_RENDER_MODE_NORMAL )
#define FT_LOAD_TARGET_LIGHT FT_LOAD_TARGET_( FT_RENDER_MODE_LIGHT )
@ -3201,8 +3201,8 @@ FT_BEGIN_HEADER
* @FT_LOAD_TARGET_XXX value.
*
*/
#define FT_LOAD_TARGET_MODE( x ) \
FT_STATIC_CAST( FT_Render_Mode )( ( (x) >> 16 ) & 15 )
#define FT_LOAD_TARGET_MODE( x ) \
FT_STATIC_CAST( FT_Render_Mode, ( (x) >> 16 ) & 15 )
/**************************************************************************

10
include/freetype/ftimage.h
View File

@ -696,11 +696,11 @@ FT_BEGIN_HEADER
*/
#ifndef FT_IMAGE_TAG
#define FT_IMAGE_TAG( value, _x1, _x2, _x3, _x4 ) \
value = ( ( FT_STATIC_CAST( unsigned char )( _x1 ) << 24 ) | \
( FT_STATIC_CAST( unsigned char )( _x2 ) << 16 ) | \
( FT_STATIC_CAST( unsigned char )( _x3 ) << 8 ) | \
FT_STATIC_CAST( unsigned char )( _x4 ) )
#define FT_IMAGE_TAG( value, _x1, _x2, _x3, _x4 ) \
value = ( ( FT_STATIC_BYTE_CAST( unsigned long, _x1 ) << 24 ) | \
( FT_STATIC_BYTE_CAST( unsigned long, _x2 ) << 16 ) | \
( FT_STATIC_BYTE_CAST( unsigned long, _x3 ) << 8 ) | \
FT_STATIC_BYTE_CAST( unsigned long, _x4 ) )
#endif /* FT_IMAGE_TAG */

6
include/freetype/ftmodapi.h
View File

@ -347,9 +347,9 @@ FT_BEGIN_HEADER
* 2.11
*
*/
#define FT_FACE_DRIVER_NAME( face ) \
( ( *FT_REINTERPRET_CAST( FT_Module_Class** ) \
( ( face )->driver ) )->module_name )
#define FT_FACE_DRIVER_NAME( face ) \
( ( *FT_REINTERPRET_CAST( FT_Module_Class**, \
( face )->driver ) )->module_name )
/**************************************************************************

17
include/freetype/fttypes.h
View File

@ -479,18 +479,19 @@ FT_BEGIN_HEADER
*
* @description:
* This macro converts four-letter tags that are used to label TrueType
* tables into an unsigned long, to be used within FreeType.
* tables into an `FT_Tag` type, to be used within FreeType.
*
* @note:
* The produced values **must** be 32-bit integers. Don't redefine this
* macro.
*/
#define FT_MAKE_TAG( _x1, _x2, _x3, _x4 ) \
FT_STATIC_CAST( FT_Tag ) \
( ( FT_STATIC_CAST( FT_Byte )( _x1 ) << 24 ) | \
( FT_STATIC_CAST( FT_Byte )( _x2 ) << 16 ) | \
( FT_STATIC_CAST( FT_Byte )( _x3 ) << 8 ) | \
FT_STATIC_CAST( FT_Byte )( _x4 ) )
#define FT_MAKE_TAG( _x1, _x2, _x3, _x4 ) \
FT_STATIC_CAST( \
FT_Tag, \
( ( FT_STATIC_BYTE_CAST( FT_Tag, _x1 ) << 24 ) | \
( FT_STATIC_BYTE_CAST( FT_Tag, _x2 ) << 16 ) | \
( FT_STATIC_BYTE_CAST( FT_Tag, _x3 ) << 8 ) | \
FT_STATIC_BYTE_CAST( FT_Tag, _x4 ) ) )
/*************************************************************************/
@ -588,7 +589,7 @@ FT_BEGIN_HEADER
#define FT_IS_EMPTY( list ) ( (list).head == 0 )
#define FT_BOOL( x ) FT_STATIC_CAST( FT_Bool )( (x) != 0 )
#define FT_BOOL( x ) FT_STATIC_CAST( FT_Bool, (x) != 0 )
/* concatenate C tokens */
#define FT_ERR_XCAT( x, y ) x ## y

7
src/raster/ftmisc.h
View File

@ -47,11 +47,8 @@
typedef signed long FT_F26Dot6;
typedef int FT_Error;
#define FT_MAKE_TAG( _x1, _x2, _x3, _x4 ) \
( ( (FT_ULong)_x1 << 24 ) | \
( (FT_ULong)_x2 << 16 ) | \
( (FT_ULong)_x3 << 8 ) | \
(FT_ULong)_x4 )
#define FT_STATIC_BYTE_CAST( type, var ) (type)(FT_Byte)(var)
/* from include/freetype/ftsystem.h */

2
src/smooth/ftgrays.c
View File

@ -152,7 +152,7 @@
#define ADD_INT( a, b ) \
(int)( (unsigned int)(a) + (unsigned int)(b) )
#define FT_STATIC_CAST( type ) (type)
#define FT_STATIC_BYTE_CAST( type, var ) (type)(unsigned char)(var)
#define ft_memset memset