ref: e66d7300fec2f9fc60e43a924af1972b07ee316b
parent: 9b710cd56eb66c379686e82d7fe371c212aebc37
author: Werner Lemberg <[email protected]>
date: Wed May 31 12:16:50 EDT 2017
[cff] 32bit integer overflow run-time errors 2/2 (#46149). This commit handles the new engine. * include/freetype/internal/ftcalc.h (OVERFLOW_ADD_INT32, OVERFLOW_SUB_INT32, OVERFLOW_MUL_INT32, NEG_INT, NEG_LONG, NEG_INT32): New macros. * src/cff/cf2ft.c (cf2_getScaleAndHintFlag): Use OVERFLOW_ADD_INT32. * src/cff/cf2hints.c (cf2_getWindingMomentum, cf2_hint_init, cf2_hintmap_map, cf2_glyphpath_hintPoint, cf2_glyphpath_computeIntersection, cf2_glyphpath_computeOffset, cf2_glyphpath_lineTo, cf2_glyphpath_curveTo): Use OVERFLOW_ADD_INT32, OVERFLOW_SUB_INT32, OVERFLOW_MUL_INT32, and NEG_INT32 where appropriate. * src/cff/cf2intrp.c (cf2_doFlex, cf2_doBlend, cf2_interpT2CharString): Ditto. Also add some other code where needed to avoid overflow.
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,26 @@
+2017-05-31 Werner Lemberg <[email protected]>
+
+ [cff] 32bit integer overflow run-time errors 2/2 (#46149).
+
+ This commit handles the new engine.
+
+ * include/freetype/internal/ftcalc.h (OVERFLOW_ADD_INT32,
+ OVERFLOW_SUB_INT32, OVERFLOW_MUL_INT32, NEG_INT, NEG_LONG,
+ NEG_INT32): New macros.
+
+ * src/cff/cf2ft.c (cf2_getScaleAndHintFlag): Use OVERFLOW_ADD_INT32.
+
+ * src/cff/cf2hints.c (cf2_getWindingMomentum, cf2_hint_init,
+ cf2_hintmap_map, cf2_glyphpath_hintPoint,
+ cf2_glyphpath_computeIntersection, cf2_glyphpath_computeOffset,
+ cf2_glyphpath_lineTo, cf2_glyphpath_curveTo): Use
+ OVERFLOW_ADD_INT32, OVERFLOW_SUB_INT32, OVERFLOW_MUL_INT32, and
+ NEG_INT32 where appropriate.
+
+ * src/cff/cf2intrp.c (cf2_doFlex, cf2_doBlend,
+ cf2_interpT2CharString): Ditto.
+ Also add some other code where needed to avoid overflow.
+
2017-05-30 Werner Lemberg <[email protected]>
[cff] 32bit integer overflow run-time errors 1/2 (#46149).
--- a/include/freetype/internal/ftcalc.h
+++ b/include/freetype/internal/ftcalc.h
@@ -423,6 +423,8 @@
(FT_Int)( (FT_UInt)(a) - (FT_UInt)(b) )
#define OVERFLOW_MUL_INT( a, b ) \
(FT_Int)( (FT_UInt)(a) * (FT_UInt)(b) )
+#define NEG_INT( a ) \
+ (FT_Int)( -(FT_UInt)(a) )
#define OVERFLOW_ADD_LONG( a, b ) \
(FT_Long)( (FT_ULong)(a) + (FT_ULong)(b) )
@@ -430,6 +432,17 @@
(FT_Long)( (FT_ULong)(a) - (FT_ULong)(b) )
#define OVERFLOW_MUL_LONG( a, b ) \
(FT_Long)( (FT_ULong)(a) * (FT_ULong)(b) )
+#define NEG_LONG( a ) \
+ (FT_Long)( -(FT_ULong)(a) )
+
+#define OVERFLOW_ADD_INT32( a, b ) \
+ (FT_Int32)( (FT_UInt32)(a) + (FT_UInt32)(b) )
+#define OVERFLOW_SUB_INT32( a, b ) \
+ (FT_Int32)( (FT_UInt32)(a) - (FT_UInt32)(b) )
+#define OVERFLOW_MUL_INT32( a, b ) \
+ (FT_Int32)( (FT_UInt32)(a) * (FT_UInt32)(b) )
+#define NEG_INT32( a ) \
+ (FT_Int32)( -(FT_UInt32)(a) )
FT_END_HEADER
--- a/src/cff/cf2ft.c
+++ b/src/cff/cf2ft.c
@@ -267,8 +267,10 @@
if ( *hinted )
{- *x_scale = ( decoder->builder.glyph->x_scale + 32 ) / 64;
- *y_scale = ( decoder->builder.glyph->y_scale + 32 ) / 64;
+ *x_scale = OVERFLOW_ADD_INT32( decoder->builder.glyph->x_scale,
+ 32 ) / 64;
+ *y_scale = OVERFLOW_ADD_INT32( decoder->builder.glyph->y_scale,
+ 32 ) / 64;
}
else
{--- a/src/cff/cf2hints.c
+++ b/src/cff/cf2hints.c
@@ -74,8 +74,8 @@
/* cross product of pt1 position from origin with pt2 position from */
/* pt1; we reduce the precision so that the result fits into 32 bits */
- return ( x1 >> 16 ) * ( ( y2 - y1 ) >> 16 ) -
- ( y1 >> 16 ) * ( ( x2 - x1 ) >> 16 );
+ return ( x1 >> 16 ) * ( OVERFLOW_SUB_INT32( y2, y1 ) >> 16 ) -
+ ( y1 >> 16 ) * ( OVERFLOW_SUB_INT32( x2, x1 ) >> 16 );
}
@@ -185,11 +185,11 @@
/* darkening. Bottoms are not changed; tops are incremented by twice */
/* `darkenY'. */
if ( cf2_hint_isTop( hint ) )
- hint->csCoord += 2 * font->darkenY;
+ hint->csCoord = OVERFLOW_ADD_INT32( hint->csCoord, 2 * font->darkenY );
- hint->csCoord += hintOrigin;
- hint->scale = scale;
- hint->index = indexStemHint; /* index in original stem hint array */
+ hint->csCoord = OVERFLOW_ADD_INT32( hint->csCoord, hintOrigin );
+ hint->scale = scale;
+ hint->index = indexStemHint; /* index in original stem hint array */
/* if original stem hint has been used, use the same position */
if ( hint->flags != 0 && stemHint->used )
@@ -314,6 +314,7 @@
/* start linear search from last hit */
CF2_UInt i = hintmap->lastIndex;
+
FT_ASSERT( hintmap->lastIndex < CF2_MAX_HINT_EDGES );
/* search up */
@@ -330,9 +331,10 @@
if ( i == 0 && csCoord < hintmap->edge[0].csCoord )
{/* special case for points below first edge: use uniform scale */
- return FT_MulFix( csCoord - hintmap->edge[0].csCoord,
- hintmap->scale ) +
- hintmap->edge[0].dsCoord;
+ return OVERFLOW_ADD_INT32(
+ FT_MulFix( csCoord - hintmap->edge[0].csCoord,
+ hintmap->scale ),
+ hintmap->edge[0].dsCoord );
}
else
{@@ -340,9 +342,10 @@
* Note: entries with duplicate csCoord are allowed.
* Use edge[i], the highest entry where csCoord >= entry[i].csCoord
*/
- return FT_MulFix( csCoord - hintmap->edge[i].csCoord,
- hintmap->edge[i].scale ) +
- hintmap->edge[i].dsCoord;
+ return OVERFLOW_ADD_INT32(
+ FT_MulFix( csCoord - hintmap->edge[i].csCoord,
+ hintmap->edge[i].scale ),
+ hintmap->edge[i].dsCoord );
}
}
}
@@ -781,7 +784,7 @@
cf2_arrstack_size( hStemHintArray ) +
cf2_arrstack_size( vStemHintArray ) );
if ( !cf2_hintmask_isValid( hintMask ) )
- return; /* too many stem hints */
+ return; /* too many stem hints */
}
/* begin by clearing the map */
@@ -797,7 +800,7 @@
/* Defense-in-depth. Should never return here. */
if ( bitCount > hintMask->bitCount )
- return;
+ return;
/* synthetic embox hints get highest priority */
if ( font->blues.doEmBoxHints )
@@ -1095,16 +1098,20 @@
FT_Vector pt; /* hinted point in upright DS */
- pt.x = FT_MulFix( glyphpath->scaleX, x ) +
- FT_MulFix( glyphpath->scaleC, y );
+ pt.x = OVERFLOW_ADD_INT32( FT_MulFix( glyphpath->scaleX, x ),
+ FT_MulFix( glyphpath->scaleC, y ) );
pt.y = cf2_hintmap_map( hintmap, y );
- ppt->x = FT_MulFix( glyphpath->font->outerTransform.a, pt.x ) +
- FT_MulFix( glyphpath->font->outerTransform.c, pt.y ) +
- glyphpath->fractionalTranslation.x;
- ppt->y = FT_MulFix( glyphpath->font->outerTransform.b, pt.x ) +
- FT_MulFix( glyphpath->font->outerTransform.d, pt.y ) +
- glyphpath->fractionalTranslation.y;
+ ppt->x = OVERFLOW_ADD_INT32(
+ FT_MulFix( glyphpath->font->outerTransform.a, pt.x ),
+ OVERFLOW_ADD_INT32(
+ FT_MulFix( glyphpath->font->outerTransform.c, pt.y ),
+ glyphpath->fractionalTranslation.x ) );
+ ppt->y = OVERFLOW_ADD_INT32(
+ FT_MulFix( glyphpath->font->outerTransform.b, pt.x ),
+ OVERFLOW_ADD_INT32(
+ FT_MulFix( glyphpath->font->outerTransform.d, pt.y ),
+ glyphpath->fractionalTranslation.y ) );
}
@@ -1154,12 +1161,12 @@
CF2_Fixed denominator, s;
- u.x = CF2_CS_SCALE( u2->x - u1->x );
- u.y = CF2_CS_SCALE( u2->y - u1->y );
- v.x = CF2_CS_SCALE( v2->x - v1->x );
- v.y = CF2_CS_SCALE( v2->y - v1->y );
- w.x = CF2_CS_SCALE( v1->x - u1->x );
- w.y = CF2_CS_SCALE( v1->y - u1->y );
+ u.x = CF2_CS_SCALE( OVERFLOW_SUB_INT32( u2->x, u1->x ) );
+ u.y = CF2_CS_SCALE( OVERFLOW_SUB_INT32( u2->y, u1->y ) );
+ v.x = CF2_CS_SCALE( OVERFLOW_SUB_INT32( v2->x, v1->x ) );
+ v.y = CF2_CS_SCALE( OVERFLOW_SUB_INT32( v2->y, v1->y ) );
+ w.x = CF2_CS_SCALE( OVERFLOW_SUB_INT32( v1->x, u1->x ) );
+ w.y = CF2_CS_SCALE( OVERFLOW_SUB_INT32( v1->y, u1->y ) );
denominator = cf2_perp( u, v );
@@ -1168,9 +1175,14 @@
s = FT_DivFix( cf2_perp( w, v ), denominator );
- intersection->x = u1->x + FT_MulFix( s, u2->x - u1->x );
- intersection->y = u1->y + FT_MulFix( s, u2->y - u1->y );
+ intersection->x = OVERFLOW_ADD_INT32(
+ u1->x,
+ FT_MulFix( s, OVERFLOW_SUB_INT32( u2->x, u1->x ) ) );
+ intersection->y = OVERFLOW_ADD_INT32(
+ u1->y,
+ FT_MulFix( s, OVERFLOW_SUB_INT32( u2->y, u1->y ) ) );
+
/*
* Special case snapping for horizontal and vertical lines.
* This cleans up intersections and reduces problems with winding
@@ -1180,25 +1192,35 @@
*
*/
- if ( u1->x == u2->x &&
- cf2_fixedAbs( intersection->x - u1->x ) < glyphpath->snapThreshold )
+ if ( u1->x == u2->x &&
+ cf2_fixedAbs( OVERFLOW_SUB_INT32(
+ intersection->x,
+ u1->x ) ) < glyphpath->snapThreshold )
intersection->x = u1->x;
- if ( u1->y == u2->y &&
- cf2_fixedAbs( intersection->y - u1->y ) < glyphpath->snapThreshold )
+ if ( u1->y == u2->y &&
+ cf2_fixedAbs( OVERFLOW_SUB_INT32(
+ intersection->y,
+ u1->y ) ) < glyphpath->snapThreshold )
intersection->y = u1->y;
- if ( v1->x == v2->x &&
- cf2_fixedAbs( intersection->x - v1->x ) < glyphpath->snapThreshold )
+ if ( v1->x == v2->x &&
+ cf2_fixedAbs( OVERFLOW_SUB_INT32(
+ intersection->x,
+ v1->x ) ) < glyphpath->snapThreshold )
intersection->x = v1->x;
- if ( v1->y == v2->y &&
- cf2_fixedAbs( intersection->y - v1->y ) < glyphpath->snapThreshold )
+ if ( v1->y == v2->y &&
+ cf2_fixedAbs( OVERFLOW_SUB_INT32(
+ intersection->y,
+ v1->y ) ) < glyphpath->snapThreshold )
intersection->y = v1->y;
/* limit the intersection distance from midpoint of u2 and v1 */
- if ( cf2_fixedAbs( intersection->x - ( u2->x + v1->x ) / 2 ) >
- glyphpath->miterLimit ||
- cf2_fixedAbs( intersection->y - ( u2->y + v1->y ) / 2 ) >
- glyphpath->miterLimit )
+ if ( cf2_fixedAbs( intersection->x -
+ OVERFLOW_ADD_INT32( u2->x, v1->x ) / 2 ) >
+ glyphpath->miterLimit ||
+ cf2_fixedAbs( intersection->y -
+ OVERFLOW_ADD_INT32( u2->y, v1->y ) / 2 ) >
+ glyphpath->miterLimit )
return FALSE;
return TRUE;
@@ -1446,8 +1468,8 @@
CF2_Fixed* x,
CF2_Fixed* y )
{- CF2_Fixed dx = x2 - x1;
- CF2_Fixed dy = y2 - y1;
+ CF2_Fixed dx = OVERFLOW_SUB_INT32( x2, x1 );
+ CF2_Fixed dy = OVERFLOW_SUB_INT32( y2, y1 );
/* note: negative offsets don't work here; negate deltas to change */
@@ -1454,8 +1476,8 @@
/* quadrants, below */
if ( glyphpath->font->reverseWinding )
{- dx = -dx;
- dy = -dy;
+ dx = NEG_INT32( dx );
+ dy = NEG_INT32( dy );
}
*x = *y = 0;
@@ -1474,13 +1496,13 @@
{/* first quadrant, +x +y */
- if ( dx > 2 * dy )
+ if ( dx > OVERFLOW_MUL_INT32( 2, dy ) )
{/* +x */
*x = 0;
*y = 0;
}
- else if ( dy > 2 * dx )
+ else if ( dy > OVERFLOW_MUL_INT32( 2, dx ) )
{/* +y */
*x = glyphpath->xOffset;
@@ -1499,16 +1521,16 @@
{/* fourth quadrant, +x -y */
- if ( dx > -2 * dy )
+ if ( dx > OVERFLOW_MUL_INT32( -2, dy ) )
{/* +x */
*x = 0;
*y = 0;
}
- else if ( -dy > 2 * dx )
+ else if ( NEG_INT32( dy ) > OVERFLOW_MUL_INT32( 2, dx ) )
{/* -y */
- *x = -glyphpath->xOffset;
+ *x = NEG_INT32( glyphpath->xOffset );
*y = glyphpath->yOffset;
}
else
@@ -1527,13 +1549,13 @@
{/* second quadrant, -x +y */
- if ( -dx > 2 * dy )
+ if ( NEG_INT32( dx ) > OVERFLOW_MUL_INT32( 2, dy ) )
{/* -x */
*x = 0;
- *y = 2 * glyphpath->yOffset;
+ *y = OVERFLOW_MUL_INT32( 2, glyphpath->yOffset );
}
- else if ( dy > -2 * dx )
+ else if ( dy > OVERFLOW_MUL_INT32( -2, dx ) )
{/* +y */
*x = glyphpath->xOffset;
@@ -1552,16 +1574,16 @@
{/* third quadrant, -x -y */
- if ( -dx > -2 * dy )
+ if ( NEG_INT32( dx ) > OVERFLOW_MUL_INT32( -2, dy ) )
{/* -x */
*x = 0;
- *y = 2 * glyphpath->yOffset;
+ *y = OVERFLOW_MUL_INT32( 2, glyphpath->yOffset );
}
- else if ( -dy > -2 * dx )
+ else if ( NEG_INT32( dy ) > OVERFLOW_MUL_INT32( -2, dx ) )
{/* -y */
- *x = -glyphpath->xOffset;
+ *x = NEG_INT32( glyphpath->xOffset );
*y = glyphpath->yOffset;
}
else
@@ -1675,10 +1697,10 @@
&yOffset );
/* construct offset points */
- P0.x = glyphpath->currentCS.x + xOffset;
- P0.y = glyphpath->currentCS.y + yOffset;
- P1.x = x + xOffset;
- P1.y = y + yOffset;
+ P0.x = OVERFLOW_ADD_INT32( glyphpath->currentCS.x, xOffset );
+ P0.y = OVERFLOW_ADD_INT32( glyphpath->currentCS.y, yOffset );
+ P1.x = OVERFLOW_ADD_INT32( x, xOffset );
+ P1.y = OVERFLOW_ADD_INT32( y, yOffset );
if ( glyphpath->moveIsPending )
{@@ -1757,15 +1779,15 @@
cf2_getWindingMomentum( x1, y1, x2, y2 );
/* construct offset points */
- P0.x = glyphpath->currentCS.x + xOffset1;
- P0.y = glyphpath->currentCS.y + yOffset1;
- P1.x = x1 + xOffset1;
- P1.y = y1 + yOffset1;
+ P0.x = OVERFLOW_ADD_INT32( glyphpath->currentCS.x, xOffset1 );
+ P0.y = OVERFLOW_ADD_INT32( glyphpath->currentCS.y, yOffset1 );
+ P1.x = OVERFLOW_ADD_INT32( x1, xOffset1 );
+ P1.y = OVERFLOW_ADD_INT32( y1, yOffset1 );
/* note: preserve angle of final segment by using offset3 at both ends */
- P2.x = x2 + xOffset3;
- P2.y = y2 + yOffset3;
- P3.x = x3 + xOffset3;
- P3.y = y3 + yOffset3;
+ P2.x = OVERFLOW_ADD_INT32( x2, xOffset3 );
+ P2.y = OVERFLOW_ADD_INT32( y2, yOffset3 );
+ P3.x = OVERFLOW_ADD_INT32( x3, xOffset3 );
+ P3.y = OVERFLOW_ADD_INT32( y3, yOffset3 );
if ( glyphpath->moveIsPending )
{--- a/src/cff/cf2intrp.c
+++ b/src/cff/cf2intrp.c
@@ -348,7 +348,9 @@
{vals[i + 2] = vals[i];
if ( readFromStack[i] )
- vals[i + 2] += cf2_stack_getReal( opStack, idx++ );
+ vals[i + 2] = OVERFLOW_ADD_INT32( vals[i + 2],
+ cf2_stack_getReal( opStack,
+ idx++ ) );
}
if ( isHFlex )
@@ -363,24 +365,26 @@
if ( lastIsX )
{- vals[12] = vals[10] + lastVal;
+ vals[12] = OVERFLOW_ADD_INT32( vals[10], lastVal );
vals[13] = *curY;
}
else
{vals[12] = *curX;
- vals[13] = vals[11] + lastVal;
+ vals[13] = OVERFLOW_ADD_INT32( vals[11], lastVal );
}
}
else
{if ( readFromStack[10] )
- vals[12] = vals[10] + cf2_stack_getReal( opStack, idx++ );
+ vals[12] = OVERFLOW_ADD_INT32( vals[10],
+ cf2_stack_getReal( opStack, idx++ ) );
else
vals[12] = *curX;
if ( readFromStack[11] )
- vals[13] = vals[11] + cf2_stack_getReal( opStack, idx );
+ vals[13] = OVERFLOW_ADD_INT32( vals[11],
+ cf2_stack_getReal( opStack, idx ) );
else
vals[13] = *curY;
}
@@ -426,7 +430,10 @@
for ( j = 1; j < blend->lenBV; j++ )
- sum += FT_MulFix( *weight++, cf2_stack_getReal( opStack, delta++ ) );
+ sum = OVERFLOW_ADD_INT32(
+ sum,
+ FT_MulFix( *weight++,
+ cf2_stack_getReal( opStack, delta++ ) ) );
/* store blended result */
cf2_stack_setReal( opStack, i + base, sum );
@@ -767,7 +774,7 @@
if ( font->decoder->width_only )
goto exit;
- curY += cf2_stack_popFixed( opStack );
+ curY = OVERFLOW_ADD_INT32( curY, cf2_stack_popFixed( opStack ) );
cf2_glyphpath_moveTo( &glyphPath, curX, curY );
@@ -783,8 +790,12 @@
for ( idx = 0; idx < count; idx += 2 )
{- curX += cf2_stack_getReal( opStack, idx + 0 );
- curY += cf2_stack_getReal( opStack, idx + 1 );
+ curX = OVERFLOW_ADD_INT32( curX,
+ cf2_stack_getReal( opStack,
+ idx + 0 ) );
+ curY = OVERFLOW_ADD_INT32( curY,
+ cf2_stack_getReal( opStack,
+ idx + 1 ) );
cf2_glyphpath_lineTo( &glyphPath, curX, curY );
}
@@ -810,9 +821,9 @@
if ( isX )
- curX += v;
+ curX = OVERFLOW_ADD_INT32( curX, v );
else
- curY += v;
+ curY = OVERFLOW_ADD_INT32( curY, v );
isX = !isX;
@@ -835,14 +846,22 @@
while ( idx + 6 <= count )
{- CF2_Fixed x1 = cf2_stack_getReal( opStack, idx + 0 ) + curX;
- CF2_Fixed y1 = cf2_stack_getReal( opStack, idx + 1 ) + curY;
- CF2_Fixed x2 = cf2_stack_getReal( opStack, idx + 2 ) + x1;
- CF2_Fixed y2 = cf2_stack_getReal( opStack, idx + 3 ) + y1;
- CF2_Fixed x3 = cf2_stack_getReal( opStack, idx + 4 ) + x2;
- CF2_Fixed y3 = cf2_stack_getReal( opStack, idx + 5 ) + y2;
+ CF2_Fixed x1, y1, x2, y2, x3, y3;
+ x1 = OVERFLOW_ADD_INT32( cf2_stack_getReal( opStack, idx + 0 ),
+ curX );
+ y1 = OVERFLOW_ADD_INT32( cf2_stack_getReal( opStack, idx + 1 ),
+ curY );
+ x2 = OVERFLOW_ADD_INT32( cf2_stack_getReal( opStack, idx + 2 ),
+ x1 );
+ y2 = OVERFLOW_ADD_INT32( cf2_stack_getReal( opStack, idx + 3 ),
+ y1 );
+ x3 = OVERFLOW_ADD_INT32( cf2_stack_getReal( opStack, idx + 4 ),
+ x2 );
+ y3 = OVERFLOW_ADD_INT32( cf2_stack_getReal( opStack, idx + 5 ),
+ y2 );
+
cf2_glyphpath_curveTo( &glyphPath, x1, y1, x2, y2, x3, y3 );
curX = x3;
@@ -852,8 +871,12 @@
if ( op1 == cf2_cmdRCURVELINE )
{- curX += cf2_stack_getReal( opStack, idx + 0 );
- curY += cf2_stack_getReal( opStack, idx + 1 );
+ curX = OVERFLOW_ADD_INT32( curX,
+ cf2_stack_getReal( opStack,
+ idx + 0 ) );
+ curY = OVERFLOW_ADD_INT32( curY,
+ cf2_stack_getReal( opStack,
+ idx + 1 ) );
cf2_glyphpath_lineTo( &glyphPath, curX, curY );
}
@@ -1129,7 +1152,10 @@
arg = cf2_stack_popFixed( opStack );
- cf2_stack_pushFixed( opStack, FT_ABS( arg ) );
+ if ( arg < -CF2_FIXED_MAX )
+ cf2_stack_pushFixed( opStack, CF2_FIXED_MAX );
+ else
+ cf2_stack_pushFixed( opStack, FT_ABS( arg ) );
}
continue; /* do not clear the stack */
@@ -1144,7 +1170,9 @@
summand2 = cf2_stack_popFixed( opStack );
summand1 = cf2_stack_popFixed( opStack );
- cf2_stack_pushFixed( opStack, summand1 + summand2 );
+ cf2_stack_pushFixed( opStack,
+ OVERFLOW_ADD_INT32( summand1,
+ summand2 ) );
}
continue; /* do not clear the stack */
@@ -1159,7 +1187,9 @@
subtrahend = cf2_stack_popFixed( opStack );
minuend = cf2_stack_popFixed( opStack );
- cf2_stack_pushFixed( opStack, minuend - subtrahend );
+ cf2_stack_pushFixed( opStack,
+ OVERFLOW_SUB_INT32( minuend,
+ subtrahend ) );
}
continue; /* do not clear the stack */
@@ -1174,7 +1204,8 @@
divisor = cf2_stack_popFixed( opStack );
dividend = cf2_stack_popFixed( opStack );
- cf2_stack_pushFixed( opStack, FT_DivFix( dividend, divisor ) );
+ cf2_stack_pushFixed( opStack,
+ FT_DivFix( dividend, divisor ) );
}
continue; /* do not clear the stack */
@@ -1187,7 +1218,10 @@
arg = cf2_stack_popFixed( opStack );
- cf2_stack_pushFixed( opStack, -arg );
+ if ( arg < -CF2_FIXED_MAX )
+ cf2_stack_pushFixed( opStack, CF2_FIXED_MAX );
+ else
+ cf2_stack_pushFixed( opStack, -arg );
}
continue; /* do not clear the stack */
@@ -1257,7 +1291,8 @@
arg2 = cf2_stack_popFixed( opStack );
arg1 = cf2_stack_popFixed( opStack );
- cf2_stack_pushFixed( opStack, cond1 <= cond2 ? arg1 : arg2 );
+ cf2_stack_pushFixed( opStack,
+ cond1 <= cond2 ? arg1 : arg2 );
}
continue; /* do not clear the stack */
@@ -1291,7 +1326,8 @@
factor2 = cf2_stack_popFixed( opStack );
factor1 = cf2_stack_popFixed( opStack );
- cf2_stack_pushFixed( opStack, FT_MulFix( factor1, factor2 ) );
+ cf2_stack_pushFixed( opStack,
+ FT_MulFix( factor1, factor2 ) );
}
continue; /* do not clear the stack */
@@ -1305,7 +1341,9 @@
arg = cf2_stack_popFixed( opStack );
if ( arg > 0 )
{- FT_Fixed root = arg;
+ /* use a start value that doesn't make */
+ /* the algorithm's addition overflow */
+ FT_Fixed root = arg < 10 ? arg : arg >> 1;
FT_Fixed new_root;
@@ -1369,7 +1407,8 @@
if ( size > 0 )
{- /* for `cf2_stack_getReal', index 0 is bottom of stack */
+ /* for `cf2_stack_getReal', */
+ /* index 0 is bottom of stack */
CF2_UInt gr_idx;
@@ -1381,7 +1420,8 @@
gr_idx = size - 1 - (CF2_UInt)idx;
cf2_stack_pushFixed( opStack,
- cf2_stack_getReal( opStack, gr_idx ) );
+ cf2_stack_getReal( opStack,
+ gr_idx ) );
}
}
continue; /* do not clear the stack */
@@ -1416,7 +1456,8 @@
cf2_stack_count( opStack ) == 5 )
{if ( !haveWidth )
- *width = cf2_stack_getReal( opStack, 0 ) + nominalWidthX;
+ *width = OVERFLOW_ADD_INT32( cf2_stack_getReal( opStack, 0 ),
+ nominalWidthX );
}
/* width is defined or default after this */
@@ -1564,7 +1605,8 @@
FT_TRACE4(( " rmoveto\n" ));
if ( cf2_stack_count( opStack ) > 2 && !haveWidth )
- *width = cf2_stack_getReal( opStack, 0 ) + nominalWidthX;
+ *width = OVERFLOW_ADD_INT32( cf2_stack_getReal( opStack, 0 ),
+ nominalWidthX );
/* width is defined or default after this */
haveWidth = TRUE;
@@ -1583,7 +1625,8 @@
FT_TRACE4(( " hmoveto\n" ));
if ( cf2_stack_count( opStack ) > 1 && !haveWidth )
- *width = cf2_stack_getReal( opStack, 0 ) + nominalWidthX;
+ *width = OVERFLOW_ADD_INT32( cf2_stack_getReal( opStack, 0 ),
+ nominalWidthX );
/* width is defined or default after this */
haveWidth = TRUE;
@@ -1591,7 +1634,7 @@
if ( font->decoder->width_only )
goto exit;
- curX += cf2_stack_popFixed( opStack );
+ curX = OVERFLOW_ADD_INT32( curX, cf2_stack_popFixed( opStack ) );
cf2_glyphpath_moveTo( &glyphPath, curX, curY );
@@ -1607,8 +1650,12 @@
while ( idx + 6 < count )
{- curX += cf2_stack_getReal( opStack, idx + 0 );
- curY += cf2_stack_getReal( opStack, idx + 1 );
+ curX = OVERFLOW_ADD_INT32( curX,
+ cf2_stack_getReal( opStack,
+ idx + 0 ) );
+ curY = OVERFLOW_ADD_INT32( curY,
+ cf2_stack_getReal( opStack,
+ idx + 1 ) );
cf2_glyphpath_lineTo( &glyphPath, curX, curY );
idx += 2;
@@ -1616,14 +1663,28 @@
while ( idx < count )
{- CF2_Fixed x1 = cf2_stack_getReal( opStack, idx + 0 ) + curX;
- CF2_Fixed y1 = cf2_stack_getReal( opStack, idx + 1 ) + curY;
- CF2_Fixed x2 = cf2_stack_getReal( opStack, idx + 2 ) + x1;
- CF2_Fixed y2 = cf2_stack_getReal( opStack, idx + 3 ) + y1;
- CF2_Fixed x3 = cf2_stack_getReal( opStack, idx + 4 ) + x2;
- CF2_Fixed y3 = cf2_stack_getReal( opStack, idx + 5 ) + y2;
+ CF2_Fixed x1, y1, x2, y2, x3, y3;
+ x1 = OVERFLOW_ADD_INT32( cf2_stack_getReal( opStack,
+ idx + 0 ),
+ curX );
+ y1 = OVERFLOW_ADD_INT32( cf2_stack_getReal( opStack,
+ idx + 1 ),
+ curY );
+ x2 = OVERFLOW_ADD_INT32( cf2_stack_getReal( opStack,
+ idx + 2 ),
+ x1 );
+ y2 = OVERFLOW_ADD_INT32( cf2_stack_getReal( opStack,
+ idx + 3 ),
+ y1 );
+ x3 = OVERFLOW_ADD_INT32( cf2_stack_getReal( opStack,
+ idx + 4 ),
+ x2 );
+ y3 = OVERFLOW_ADD_INT32( cf2_stack_getReal( opStack,
+ idx + 5 ),
+ y2 );
+
cf2_glyphpath_curveTo( &glyphPath, x1, y1, x2, y2, x3, y3 );
curX = x3;
@@ -1656,7 +1717,8 @@
if ( ( count - idx ) & 1 )
{- x1 = cf2_stack_getReal( opStack, idx ) + curX;
+ x1 = OVERFLOW_ADD_INT32( cf2_stack_getReal( opStack, idx ),
+ curX );
idx++;
}
@@ -1663,11 +1725,15 @@
else
x1 = curX;
- y1 = cf2_stack_getReal( opStack, idx + 0 ) + curY;
- x2 = cf2_stack_getReal( opStack, idx + 1 ) + x1;
- y2 = cf2_stack_getReal( opStack, idx + 2 ) + y1;
+ y1 = OVERFLOW_ADD_INT32( cf2_stack_getReal( opStack, idx + 0 ),
+ curY );
+ x2 = OVERFLOW_ADD_INT32( cf2_stack_getReal( opStack, idx + 1 ),
+ x1 );
+ y2 = OVERFLOW_ADD_INT32( cf2_stack_getReal( opStack, idx + 2 ),
+ y1 );
x3 = x2;
- y3 = cf2_stack_getReal( opStack, idx + 3 ) + y2;
+ y3 = OVERFLOW_ADD_INT32( cf2_stack_getReal( opStack, idx + 3 ),
+ y2 );
cf2_glyphpath_curveTo( &glyphPath, x1, y1, x2, y2, x3, y3 );
@@ -1701,7 +1767,8 @@
if ( ( count - idx ) & 1 )
{- y1 = cf2_stack_getReal( opStack, idx ) + curY;
+ y1 = OVERFLOW_ADD_INT32( cf2_stack_getReal( opStack, idx ),
+ curY );
idx++;
}
@@ -1708,10 +1775,14 @@
else
y1 = curY;
- x1 = cf2_stack_getReal( opStack, idx + 0 ) + curX;
- x2 = cf2_stack_getReal( opStack, idx + 1 ) + x1;
- y2 = cf2_stack_getReal( opStack, idx + 2 ) + y1;
- x3 = cf2_stack_getReal( opStack, idx + 3 ) + x2;
+ x1 = OVERFLOW_ADD_INT32( cf2_stack_getReal( opStack, idx + 0 ),
+ curX );
+ x2 = OVERFLOW_ADD_INT32( cf2_stack_getReal( opStack, idx + 1 ),
+ x1 );
+ y2 = OVERFLOW_ADD_INT32( cf2_stack_getReal( opStack, idx + 2 ),
+ y1 );
+ x3 = OVERFLOW_ADD_INT32( cf2_stack_getReal( opStack, idx + 3 ),
+ x2 );
y3 = y2;
cf2_glyphpath_curveTo( &glyphPath, x1, y1, x2, y2, x3, y3 );
@@ -1750,15 +1821,21 @@
if ( alternate )
{- x1 = cf2_stack_getReal( opStack, idx + 0 ) + curX;
+ x1 = OVERFLOW_ADD_INT32( cf2_stack_getReal( opStack, idx + 0 ),
+ curX );
y1 = curY;
- x2 = cf2_stack_getReal( opStack, idx + 1 ) + x1;
- y2 = cf2_stack_getReal( opStack, idx + 2 ) + y1;
- y3 = cf2_stack_getReal( opStack, idx + 3 ) + y2;
+ x2 = OVERFLOW_ADD_INT32( cf2_stack_getReal( opStack, idx + 1 ),
+ x1 );
+ y2 = OVERFLOW_ADD_INT32( cf2_stack_getReal( opStack, idx + 2 ),
+ y1 );
+ y3 = OVERFLOW_ADD_INT32( cf2_stack_getReal( opStack, idx + 3 ),
+ y2 );
if ( count - idx == 5 )
{- x3 = cf2_stack_getReal( opStack, idx + 4 ) + x2;
+ x3 = OVERFLOW_ADD_INT32( cf2_stack_getReal( opStack,
+ idx + 4 ),
+ x2 );
idx++;
}
@@ -1770,14 +1847,20 @@
else
{x1 = curX;
- y1 = cf2_stack_getReal( opStack, idx + 0 ) + curY;
- x2 = cf2_stack_getReal( opStack, idx + 1 ) + x1;
- y2 = cf2_stack_getReal( opStack, idx + 2 ) + y1;
- x3 = cf2_stack_getReal( opStack, idx + 3 ) + x2;
+ y1 = OVERFLOW_ADD_INT32( cf2_stack_getReal( opStack, idx + 0 ),
+ curY );
+ x2 = OVERFLOW_ADD_INT32( cf2_stack_getReal( opStack, idx + 1 ),
+ x1 );
+ y2 = OVERFLOW_ADD_INT32( cf2_stack_getReal( opStack, idx + 2 ),
+ y1 );
+ x3 = OVERFLOW_ADD_INT32( cf2_stack_getReal( opStack, idx + 3 ),
+ x2 );
if ( count - idx == 5 )
{- y3 = cf2_stack_getReal( opStack, idx + 4 ) + y2;
+ y3 = OVERFLOW_ADD_INT32( cf2_stack_getReal( opStack,
+ idx + 4 ),
+ y2 );
idx++;
}