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Fix negation of INT_MIN and LONG_MIN (#46149). 

* src/base/ftcalc.c (FT_MOVE_SIGN): Add argument to pass unsigned
value, to be used as the result.
(FT_MulDiv, FT_MulDiv_No_Round, FT_DivFix, FT_MulFix,
FT_Vector_NormLen): Updated.
This commit is contained in:
Werner Lemberg 2017-05-28 07:20:09 +02:00
parent a9331c0f4d
commit 9357219082
2 changed files with 46 additions and 36 deletions
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9
ChangeLog
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@ -1,3 +1,12 @@
2017-05-28 Werner Lemberg <wl@gnu.org>
Fix negation of INT_MIN and LONG_MIN (#46149).
* src/base/ftcalc.c (FT_MOVE_SIGN): Add argument to pass unsigned
value, to be used as the result.
(FT_MulDiv, FT_MulDiv_No_Round, FT_DivFix, FT_MulFix,
FT_Vector_NormLen): Updated.
2017-05-27 Werner Lemberg <wl@gnu.org>
[truetype] Fix handling of design coordinates (#51127).

73
src/base/ftcalc.c
View File

@ -68,14 +68,15 @@
#define FT_COMPONENT trace_calc
/* transfer sign leaving a positive number */
#define FT_MOVE_SIGN( x, s ) \
FT_BEGIN_STMNT \
if ( x < 0 ) \
{ \
x = -x; \
s = -s; \
} \
/* transfer sign, leaving a positive number; */
/* we need an unsigned value to safely negate INT_MIN (or LONG_MIN) */
#define FT_MOVE_SIGN( x, x_unsigned, s ) \
FT_BEGIN_STMNT \
if ( x < 0 ) \
{ \
x_unsigned = -x_unsigned; \
s = -s; \
} \
FT_END_STMNT
/* The following three functions are available regardless of whether */
@ -179,14 +180,14 @@
FT_Long d_;
FT_MOVE_SIGN( a_, s );
FT_MOVE_SIGN( b_, s );
FT_MOVE_SIGN( c_, s );
a = (FT_UInt64)a_;
b = (FT_UInt64)b_;
c = (FT_UInt64)c_;
FT_MOVE_SIGN( a_, a, s );
FT_MOVE_SIGN( b_, b, s );
FT_MOVE_SIGN( c_, c, s );
d = c > 0 ? ( a * b + ( c >> 1 ) ) / c
: 0x7FFFFFFFUL;
@ -208,14 +209,14 @@
FT_Long d_;
FT_MOVE_SIGN( a_, s );
FT_MOVE_SIGN( b_, s );
FT_MOVE_SIGN( c_, s );
a = (FT_UInt64)a_;
b = (FT_UInt64)b_;
c = (FT_UInt64)c_;
FT_MOVE_SIGN( a_, a, s );
FT_MOVE_SIGN( b_, b, s );
FT_MOVE_SIGN( c_, c, s );
d = c > 0 ? a * b / c
: 0x7FFFFFFFUL;
@ -257,12 +258,12 @@
FT_Long q_;
FT_MOVE_SIGN( a_, s );
FT_MOVE_SIGN( b_, s );
a = (FT_UInt64)a_;
b = (FT_UInt64)b_;
FT_MOVE_SIGN( a_, a, s );
FT_MOVE_SIGN( b_, a, s );
q = b > 0 ? ( ( a << 16 ) + ( b >> 1 ) ) / b
: 0x7FFFFFFFUL;
@ -422,14 +423,14 @@
/* XXX: this function does not allow 64-bit arguments */
FT_MOVE_SIGN( a_, s );
FT_MOVE_SIGN( b_, s );
FT_MOVE_SIGN( c_, s );
a = (FT_UInt32)a_;
b = (FT_UInt32)b_;
c = (FT_UInt32)c_;
FT_MOVE_SIGN( a_, a, s );
FT_MOVE_SIGN( b_, b, s );
FT_MOVE_SIGN( c_, c, s );
if ( c == 0 )
a = 0x7FFFFFFFUL;
@ -470,14 +471,14 @@
/* XXX: this function does not allow 64-bit arguments */
FT_MOVE_SIGN( a_, s );
FT_MOVE_SIGN( b_, s );
FT_MOVE_SIGN( c_, s );
a = (FT_UInt32)a_;
b = (FT_UInt32)b_;
c = (FT_UInt32)c_;
FT_MOVE_SIGN( a_, a, s );
FT_MOVE_SIGN( b_, b, s );
FT_MOVE_SIGN( c_, c, s );
if ( c == 0 )
a = 0x7FFFFFFFUL;
@ -575,12 +576,12 @@
/* XXX: this function does not allow 64-bit arguments */
FT_MOVE_SIGN( a_, s );
FT_MOVE_SIGN( b_, s );
a = (FT_UInt32)a_;
b = (FT_UInt32)b_;
FT_MOVE_SIGN( a_, a, s );
FT_MOVE_SIGN( b_, b, s );
if ( a + ( b >> 8 ) <= 8190UL )
a = ( a * b + 0x8000UL ) >> 16;
else
@ -614,12 +615,12 @@
/* XXX: this function does not allow 64-bit arguments */
FT_MOVE_SIGN( a_, s );
FT_MOVE_SIGN( b_, s );
a = (FT_UInt32)a_;
b = (FT_UInt32)b_;
FT_MOVE_SIGN( a_, a, s );
FT_MOVE_SIGN( b_, b, s );
if ( b == 0 )
{
/* check for division by 0 */
@ -770,12 +771,12 @@
FT_Int sx = 1, sy = 1, shift;
FT_MOVE_SIGN( x_, sx );
FT_MOVE_SIGN( y_, sy );
x = (FT_UInt32)x_;
y = (FT_UInt32)y_;
FT_MOVE_SIGN( x_, x, sx );
FT_MOVE_SIGN( y_, y, sy );
/* trivial cases */
if ( x == 0 )
{