1In order to build the fuzzer one needs to build HarfBuzz and
2harfbuzz/test/fuzzing/hb-fuzzer.cc with:
3  - Using the most recent Clang
4  - With -fsanitize=address (or =undefined, or a combination)
5  - With -fsanitize-coverage=edge[,8bit-counters,trace-cmp]
6  - With various defines that limit worst case exponential behavior.
7    See FUZZING_CPPFLAGS in harfbuzz/src/Makefile.am for the list.
8  - link against libFuzzer
9
10To run the fuzzer one needs to first obtain a test corpus as a directory
11containing interesting fonts.  A good starting point is inside
12harfbuzz/test/shaping/fonts/fonts/.
13Then, run the fuzzer like this:
14   ./hb-fuzzer -max_len=2048 CORPUS_DIR
15Where max_len specifies the maximal length of font files to handle.
16The smaller the faster.
17
18For more details consult the following locations:
19  - http://llvm.org/docs/LibFuzzer.html or
20  - https://github.com/google/libfuzzer-bot/tree/master/harfbuzz
21  - https://github.com/harfbuzz/harfbuzz/issues/139
22