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[cff] Make the `*curveto' operators more tolerant.

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* src/cff/cf2intrp.c (cf2_interpT2CharString): The opcodes
`vvcurveto', `hhcurveto', `vhcurveto', and `hvcurveto' all iterate,
pulling values off the stack until the stack is exhausted.
Implicitly the stack must be a multiple (or for subtly different
behaviour) a multiple plus a specific number of extra values deep.
If that's not the case, enforce it (as the old code did).
This commit is contained in:
Chris Liddell 2015-05-12 07:27:35 +02:00 committed by Werner Lemberg
parent d65bf72c3e
commit a87fb8ccf3
2 changed files with 33 additions and 3 deletions
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11
ChangeLog
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@ -1,3 +1,14 @@
2015-05-12 Chris Liddell <chris.liddell@artifex.com>
[cff] Make the `*curveto' operators more tolerant.
* src/cff/cf2intrp.c (cf2_interpT2CharString): The opcodes
`vvcurveto', `hhcurveto', `vhcurveto', and `hvcurveto' all iterate,
pulling values off the stack until the stack is exhausted.
Implicitly the stack must be a multiple (or for subtly different
behaviour) a multiple plus a specific number of extra values deep.
If that's not the case, enforce it (as the old code did).
2015-05-12 Chris Liddell <chris.liddell@artifex.com>
[cff] fix incremental interface with new cff code.

25
src/cff/cf2intrp.c
View File

@ -1298,10 +1298,16 @@
case cf2_cmdVVCURVETO:
{
CF2_UInt count = cf2_stack_count( opStack );
CF2_UInt count, count1 = cf2_stack_count( opStack );
CF2_UInt index = 0;
/* if `cf2_stack_count' isn't of the form 4n or 4n+1, */
/* we enforce it by clearing the second bit */
/* (and sorting the stack indexing to suit) */
count = count1 & ~2;
index += count1 - count;
FT_TRACE4(( " vvcurveto\n" ));
while ( index < count )
@ -1337,10 +1343,16 @@
case cf2_cmdHHCURVETO:
{
CF2_UInt count = cf2_stack_count( opStack );
CF2_UInt count, count1 = cf2_stack_count( opStack );
CF2_UInt index = 0;
/* if `cf2_stack_count' isn't of the form 4n or 4n+1, */
/* we enforce it by clearing the second bit */
/* (and sorting the stack indexing to suit) */
count = count1 & ~2;
index += count1 - count;
FT_TRACE4(( " hhcurveto\n" ));
while ( index < count )
@ -1377,12 +1389,19 @@
case cf2_cmdVHCURVETO:
case cf2_cmdHVCURVETO:
{
CF2_UInt count = cf2_stack_count( opStack );
CF2_UInt count, count1 = cf2_stack_count( opStack );
CF2_UInt index = 0;
FT_Bool alternate = op1 == cf2_cmdHVCURVETO;
/* if `cf2_stack_count' isn't of the form 8n, 8n+1, */
/* 8n+4, or 8n+5, we enforce it by clearing the */
/* second bit */
/* (and sorting the stack indexing to suit) */
count = count1 & ~2;
index += count1 - count;
FT_TRACE4(( alternate ? " hvcurveto\n" : " vhcurveto\n" ));
while ( index < count )