Update fuzzers

This changes the names of the two fuzzers so they align with
current oss-fuzz usage (to provide continuity in test data and
corpora) and adds a dictionary to the decoder fuzzer. It also
removes some unnecessary configuration, as it clashed with oss-fuzz
defaults

.gitignore

@@ -75,8 +75,8 @@ test/picture.diff
 test/picture.log
 .dirstamp
 microbench/benchmark_residual
-oss-fuzz/fuzz-decoder
-oss-fuzz/fuzz-encoder
+oss-fuzz/fuzzer_decoder
+oss-fuzz/fuzzer_encoder
 
 /*[Bb]uild*/
 /out/

configure.ac

@@ -382,15 +382,13 @@ if test "x$have_oss_fuzzers" = "xyes"; then
   else
     AM_CONDITIONAL([USE_OSSFUZZERS], [test "false" = "true"])
     # Disable fuzzer if the compiler is not Clang.
-    AC_MSG_WARN([*** Ozz-Fuzz is disabled because that requres the  Clang compiler.])
-    have_oss_fuzzers="no (compiler is GCC)"
+    AC_MSG_WARN([*** Ozz-Fuzz is disabled because that requires the Clang compiler.])
+    have_oss_fuzzers="no (compiler is not Clang)"
   fi
 else
   AM_CONDITIONAL([USE_OSSFUZZERS], [test "false" = "true"])
 fi
 
-AM_CONDITIONAL([USE_OSSFUZZ_FLAG], [test "x$LIB_FUZZING_ENGINE" = "x-fsanitize=fuzzer"])
-AM_CONDITIONAL([USE_OSSFUZZ_STATIC], [test -f "$LIB_FUZZING_ENGINE"])
 AC_SUBST([LIB_FUZZING_ENGINE])
 
 dnl check for ogg library

oss-fuzz/Makefile.am

@@ -20,7 +20,7 @@ AM_CPPFLAGS = -I$(top_srcdir)/include -I$(top_srcdir)/oss-fuzz
 AM_CXXFLAGS = -std=c++11
 
 EXTRA_DIST = \
-	fuzz-encoder.dict \
+	fuzzer_encoder.dict \
 	fuzzing/Readme.md \
 	fuzzing/datasource/datasource.hpp \
 	fuzzing/datasource/id.hpp \
@@ -28,31 +28,21 @@ EXTRA_DIST = \
 	fuzzing/memory.hpp \
 	fuzzing/types.hpp
 
-if USE_OSSFUZZ_FLAG
-FUZZ_FLAG = $(LIB_FUZZING_ENGINE)
-FUZZ_LDADD = -lFuzzer
-else
-if USE_OSSFUZZ_STATIC
-FUZZ_LDADD = $(LIB_FUZZING_ENGINE)
-FUZZ_FLAG = -lFuzzer
-endif
-endif
-
 noinst_PROGRAMS =
 
 if USE_OSSFUZZERS
-noinst_PROGRAMS += fuzz-decoder fuzz-encoder
+noinst_PROGRAMS += fuzzer_encoder fuzzer_decoder
 endif
 
-fuzz_decoder_SOURCES = fuzz-decoder.cc
-fuzz_decoder_CXXFLAGS = $(AM_CXXFLAGS) $(FUZZ_FLAG)
-fuzz_decoder_LDFLAGS = $(AM_LDFLAGS) -static
-fuzz_decoder_LDADD = $(flac_libs) $(FUZZ_LDADD)
+fuzzer_encoder_SOURCES = fuzzer_encoder.cc
+fuzzer_encoder_CXXFLAGS = $(AM_CXXFLAGS) $(LIB_FUZZING_ENGINE)
+fuzzer_encoder_LDFLAGS = $(AM_LDFLAGS)
+fuzzer_encoder_LDADD = $(flac_libs)
 
-fuzz_encoder_SOURCES = fuzz-encoder.cc
-fuzz_encoder_CXXFLAGS = $(AM_CXXFLAGS) $(FUZZ_FLAG)
-fuzz_encoder_LDFLAGS = $(AM_LDFLAGS) -static
-fuzz_encoder_LDADD = $(flac_libs) $(FUZZ_LDADD)
+fuzzer_decoder_SOURCES = fuzzer_decoder.cc
+fuzzer_decoder_CXXFLAGS = $(AM_CXXFLAGS) $(LIB_FUZZING_ENGINE)
+fuzzer_decoder_LDFLAGS = $(AM_LDFLAGS)
+fuzzer_decoder_LDADD = $(flac_libs)
 
 flac_libs = \
 	$(top_builddir)/src/libFLAC/libFLAC-static.la \

oss-fuzz/fuzzer_decoder.dict

@@ -0,0 +1,6 @@
+flac_stream_marker="fLaC"
+ogg_stream_marker="OggS"
+flac_in_ogg_marker="\x7fFLAC"
+
+synccode_fixed_blocksize="\xFF\xF8"
+synccode_variable_blocksize="\xFF\xF9"