Merge pull request #906 from silvergasp/dev

Add fuzzing harness

.gitignore

@@ -21,6 +21,7 @@ dispatch
 tests/generate_unicode_test
 tests/sanity_test
 tests/sanity_test_vectors_generator
+fuzzer
 
 # local conf
 .clang_complete

Makefile

@@ -183,6 +183,7 @@ clean:  ## remove all build artifacts
 	$(Q)$(RM) xxhsum$(EXT) xxhsum32$(EXT) xxhsum_inlinedXXH$(EXT) dispatch$(EXT)
 	$(Q)$(RM) xxhsum.wasm xxhsum.js xxhsum.html
 	$(Q)$(RM) xxh32sum$(EXT) xxh64sum$(EXT) xxh128sum$(EXT) xxh3sum$(EXT)
+	$(Q)$(RM) fuzzer
 	$(Q)$(RM) $(XXHSUM_SRC_DIR)/*.o $(XXHSUM_SRC_DIR)/*.obj
 	$(MAKE) -C tests clean
 	$(MAKE) -C tests/bench clean
@@ -315,6 +316,13 @@ test-xxhsum-c: xxhsum
 	echo "00000000  test-expects-file-not-found" | ./xxhsum -c -; test $$? -eq 1
 	@$(RM) .test.*
 
+LIB_FUZZING_ENGINE?="-fsanitize=fuzzer"
+CC_VERSION := $(shell $(CC) --version)
+ifneq (,$(findstring clang,$(CC_VERSION)))
+fuzzer: libxxhash.a fuzz/fuzzer.c
+	$(CC) $(CFLAGS) $(LIB_FUZZING_ENGINE) -I. -o fuzzer fuzz/fuzzer.c -L. -Wl,-Bstatic -lxxhash -Wl,-Bdynamic
+endif
+
 .PHONY: test-filename-escape
 test-filename-escape:
 	$(MAKE) -C tests test_filename_escape

fuzz/fuzzer.c

@@ -0,0 +1,11 @@
+#include <stdint.h>
+#include "xxhash.h"
+
+
+int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
+  volatile XXH64_hash_t hash64 = XXH64(data, size, 0);
+  (void)hash64;
+  volatile XXH32_hash_t hash32 = XXH32(data, size, 0);
+  (void)hash32;
+  return 0;
+}