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harfbuzz/test/fuzzing
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Behdad Esfahbod 9eab3ac72d [CoverageFormat2] Remove hand-written loop 
While on a fuzzer-found test case (added) that loop was faster,
on real fonts, including NotoNastaliq in our benchmark, it was
actually slower, which intuitively I would have expected.

Still no idea why on that fuzzer case it's faster though. :(
 		2022-07-21 12:36:53 -06:00
..
fonts [CoverageFormat2] Remove hand-written loop 2022-07-21 12:36:53 -06:00
sets [fuzz] minor, move two fuzzer cases to their correct place 2020-02-12 19:17:18 +03:30
Makefile.am Revert "Remove autotools build support" 2020-08-11 23:51:59 +04:30
README Move all references of old url to the new address (#622) 2017-11-20 14:49:22 -05:00
hb-draw-fuzzer.cc [cff] Add a max work counter 2022-07-18 13:57:59 -06:00
hb-fuzzer.hh [fuzzer] In 50% of runs don't fail the allocator 2022-07-01 15:25:09 -06:00
hb-set-fuzzer.cc [fuzzer] In 50% of runs don't fail the allocator 2022-07-01 15:25:09 -06:00
hb-shape-fuzzer.cc [fuzzer] In 50% of runs don't fail the allocator 2022-07-01 15:25:09 -06:00
hb-subset-fuzzer.cc [fuzzer] In 50% of runs don't fail the allocator 2022-07-01 15:25:09 -06:00
main.cc [blob] Add failing versions of create API 2021-06-15 13:56:30 -06:00
meson.build [meson] Require 0.55.0 2021-11-22 03:11:36 +02:00
run-draw-fuzzer-tests.py [test] Remove timeout from test runners 2020-10-15 00:49:02 -07:00
run-shape-fuzzer-tests.py [test] Remove timeout from test runners 2020-10-15 00:49:02 -07:00
run-subset-fuzzer-tests.py [test] Remove timeout from test runners 2020-10-15 00:49:02 -07:00

README 

In order to build the fuzzer one needs to build HarfBuzz and
harfbuzz/test/fuzzing/hb-fuzzer.cc with:
  - Using the most recent Clang
  - With -fsanitize=address (or =undefined, or a combination)
  - With -fsanitize-coverage=edge[,8bit-counters,trace-cmp]
  - With various defines that limit worst case exponential behavior.
    See FUZZING_CPPFLAGS in harfbuzz/src/Makefile.am for the list.
  - link against libFuzzer

To run the fuzzer one needs to first obtain a test corpus as a directory
containing interesting fonts.  A good starting point is inside
harfbuzz/test/shaping/fonts/fonts/.
Then, run the fuzzer like this:
   ./hb-fuzzer -max_len=2048 CORPUS_DIR
Where max_len specifies the maximal length of font files to handle.
The smaller the faster.

For more details consult the following locations:
  - http://llvm.org/docs/LibFuzzer.html or
  - https://github.com/google/libfuzzer-bot/tree/master/harfbuzz
  - https://github.com/harfbuzz/harfbuzz/issues/139