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[type1] Fix `FT_Get_Var_Axis_Flags' (#56804). 

* src/type1/t1load.c (T1_Get_MM_Var): Allocate space for axis flags.
Also remove redundant assignment.
This commit is contained in:
Werner Lemberg 2019-08-26 09:08:56 +02:00
parent 734d60f63c
commit 7d1d3b9a0e
4 changed files with 55 additions and 11 deletions
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9
ChangeLog
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@ -1,4 +1,11 @@
2019-06-26 Alexei Podtelezhnikov <apodtele@gmail.com>
2019-08-26 Werner Lemberg <wl@gnu.org>
[type1] Fix `FT_Get_Var_Axis_Flags' (#56804).
* src/type1/t1load.c (T1_Get_MM_Var): Allocate space for axis flags.
Also remove redundant assignment.
2019-07-24 Alexei Podtelezhnikov <apodtele@gmail.com>
* src/base/ftbbox.c (cubic_peak): Sanitize left shift (#56586).

13
docs/CHANGES
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@ -1,4 +1,17 @@
CHANGES BETWEEN 2.10.0 and 2.10.1
I. IMPORTANT CHANGES
II. MISCELLANEOUS
- Function `FT_Get_Var_Axis_Flags' returned random data for Type 1
MM fonts.
======================================================================
CHANGES BETWEEN 2.10.0 and 2.10.1
I. IMPORTANT BUG FIXES

2
src/truetype/ttgxvar.c
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@ -2127,7 +2127,7 @@
/* `fvar' table validity check in `sfnt_init_face' */
/* the various `*_size' variables, which we also use as */
/* offsets into the `mmlen' array, must be multiples of the */
/* offsets into the `mmvar' array, must be multiples of the */
/* pointer size (except the last one); without such an */
/* alignment there might be runtime errors due to */
/* misaligned addresses */

42
src/type1/t1load.c
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@ -309,31 +309,55 @@
FT_UInt i;
FT_Fixed axiscoords[T1_MAX_MM_AXIS];
PS_Blend blend = face->blend;
FT_UShort* axis_flags;
FT_Offset mmvar_size;
FT_Offset axis_flags_size;
FT_Offset axis_size;
error = T1_Get_Multi_Master( face, &mmaster );
if ( error )
goto Exit;
if ( FT_ALLOC( mmvar,
sizeof ( FT_MM_Var ) +
mmaster.num_axis * sizeof ( FT_Var_Axis ) ) )
/* the various `*_size' variables, which we also use as */
/* offsets into the `mmvar' array, must be multiples of the */
/* pointer size (except the last one); without such an */
/* alignment there might be runtime errors due to */
/* misaligned addresses */
#undef ALIGN_SIZE
#define ALIGN_SIZE( n ) \
( ( (n) + sizeof (void*) - 1 ) & ~( sizeof (void*) - 1 ) )
mmvar_size = ALIGN_SIZE( sizeof ( FT_MM_Var ) );
axis_flags_size = ALIGN_SIZE( mmaster.num_axis *
sizeof ( FT_UShort ) );
axis_size = mmaster.num_axis * sizeof ( FT_Var_Axis );
if ( FT_ALLOC( mmvar, mmvar_size +
axis_flags_size +
axis_size ) )
goto Exit;
mmvar->num_axis = mmaster.num_axis;
mmvar->num_designs = mmaster.num_designs;
mmvar->num_namedstyles = 0; /* Not supported */
mmvar->axis = (FT_Var_Axis*)&mmvar[1];
/* Point to axes after MM_Var struct */
mmvar->namedstyle = NULL;
/* while axis flags are meaningless here, we have to provide the array */
/* to make `FT_Get_Var_Axis_Flags' work: the function expects that the */
/* values directly follow the data of `FT_MM_Var' */
axis_flags = (FT_UShort*)( (char*)mmvar + mmvar_size );
for ( i = 0; i < mmaster.num_axis; i++ )
axis_flags[i] = 0;
mmvar->axis = (FT_Var_Axis*)( (char*)axis_flags + axis_flags_size );
mmvar->namedstyle = NULL;
for ( i = 0; i < mmaster.num_axis; i++ )
{
mmvar->axis[i].name = mmaster.axis[i].name;
mmvar->axis[i].minimum = INT_TO_FIXED( mmaster.axis[i].minimum );
mmvar->axis[i].maximum = INT_TO_FIXED( mmaster.axis[i].maximum );
mmvar->axis[i].def = ( mmvar->axis[i].minimum +
mmvar->axis[i].maximum ) / 2;
/* Does not apply. But this value is in range */
mmvar->axis[i].strid = ~0U; /* Does not apply */
mmvar->axis[i].tag = ~0U; /* Does not apply */