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[ftfuzzer] Improve coverage of rasterfuzzer. 

* src/tools/ftfuzzer/rasterfuzzer.cc (LLVMFuzzerTestOneInput): Use
input data for `tags' array also.
Trim input data to get more positive hits.
This commit is contained in:
Werner Lemberg 2016-03-12 23:48:13 +01:00
parent 10265db114
commit ee6b4115d2
2 changed files with 44 additions and 11 deletions
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8
ChangeLog
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@ -1,3 +1,11 @@
2016-03-12 Werner Lemberg <wl@gnu.org>
[ftfuzzer] Improve coverage of rasterfuzzer.
* src/tools/ftfuzzer/rasterfuzzer.cc (LLVMFuzzerTestOneInput): Use
input data for `tags' array also.
Trim input data to get more positive hits.
2016-03-11 Pavlo Denysov <paul.kiev+savannah@gmail.com>
Fix CMake issues for iOS (patch #8941).

47
src/tools/ftfuzzer/rasterfuzzer.cc
View File

@ -71,27 +71,52 @@
NULL // palette
};
short n_points = short( size_ / sizeof ( FT_Vector ) );
const size_t vsize = sizeof ( FT_Vector );
const size_t tsize = sizeof ( char );
// we use the input data for both points and tags
short n_points = short( size_ / ( vsize + tsize ) );
if ( n_points <= 2 )
return 0;
FT_Vector* points = reinterpret_cast<FT_Vector*>(
const_cast<uint8_t*>( data ) );
const_cast<uint8_t*>(
data ) );
char* tags = reinterpret_cast<char*>(
const_cast<uint8_t*>(
data + size_t( n_points ) * vsize ) );
// to reduce the number of invalid outlines that are immediately
// rejected in `FT_Outline_Render', limit values to 2^18 pixels
// (i.e., 2^24 bits)
for ( short i = 0; i < n_points; i++ )
{
if ( points[i].x == LONG_MIN )
points[i].x = 0;
else if ( points[i].x < 0 )
points[i].x = -( -points[i].x & 0xFFFFFF ) - 1;
else
points[i].x = ( points[i].x & 0xFFFFFF ) + 1;
if ( points[i].y == LONG_MIN )
points[i].y = 0;
else if ( points[i].y < 0 )
points[i].y = -( -points[i].y & 0xFFFFFF ) - 1;
else
points[i].y = ( points[i].y & 0xFFFFFF ) + 1;
}
short contours[1];
contours[0] = n_points - 1;
vector<char> tags( (size_t)n_points );
fill( tags.begin(), tags.end(), 1 );
FT_Outline outline =
{
1, // n_contours
n_points, // n_points
points, // points
reinterpret_cast<char*>( tags.data() ), // tags
contours, // contours
FT_OUTLINE_NONE // flags
1, // n_contours
n_points, // n_points
points, // points
tags, // tags
contours, // contours
FT_OUTLINE_NONE // flags
};
FT_Outline_Get_Bitmap( library, &outline, &bitmap_mono );