feature: Add a roundtrip fuzz testing harness

fuzz/makefile.mk

@@ -0,0 +1,52 @@
+#
+# Copyright 2022 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at:
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+efuzz_src += \
+    $(FUZZ_DIR)/efuzz.cc
+
+efuzz_lib += liblc3
+efuzz_ldlibs += m
+
+$(eval $(call add-bin,efuzz))
+
+
+dfuzz_src += \
+    $(FUZZ_DIR)/dfuzz.cc
+
+dfuzz_lib += liblc3
+dfuzz_ldlibs += m
+
+$(eval $(call add-bin,dfuzz))
+
+
+.PHONY: fuzz dfuzz efuzz
+
+efuzz dfuzz: CC  = clang
+efuzz dfuzz: CXX = clang++
+efuzz dfuzz: LD  = clang
+
+FUZZER_SANITIZE := -fsanitize=fuzzer,address
+efuzz dfuzz: CFLAGS   += $(FUZZER_SANITIZE)
+efuzz dfuzz: CXXFLAGS += $(FUZZER_SANITIZE)
+efuzz dfuzz: LDFLAGS  += $(FUZZER_SANITIZE)
+
+dfuzz:
+	$(V)$(dfuzz_bin) -runs=1000000
+
+efuzz:
+	$(V)$(efuzz_bin) -runs=1000000
+
+fuzz: efuzz dfuzz