fuzz: migrate bdiff fuzzer to use FuzzedDataProvider

Differential Revision: https://phab.mercurial-scm.org/D7368

contrib/fuzz/bdiff.cc

@@ -1,44 +1,42 b''
 /*
  * bdiff.cc - fuzzer harness for bdiff.c
  *
  * Copyright 2018, Google Inc.
  *
  * This software may be used and distributed according to the terms of
  * the GNU General Public License, incorporated herein by reference.
  */
 #include <memory>
 #include <stdlib.h>
 
-#include "fuzzutil.h"
+#include <fuzzer/FuzzedDataProvider.h>
 
 extern "C" {
 #include "bdiff.h"
 
 int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size)
 {
-	auto maybe_inputs = SplitInputs(Data, Size);
-	if (!maybe_inputs) {
-		return 0;
-	}
-	auto inputs = std::move(maybe_inputs.value());
+	FuzzedDataProvider provider(Data, Size);
+	std::string left = provider.ConsumeRandomLengthString(Size);
+	std::string right = provider.ConsumeRemainingBytesAsString();
 
 	struct bdiff_line *a, *b;
-	int an = bdiff_splitlines(inputs.left.get(), inputs.left_size, &a);
-	int bn = bdiff_splitlines(inputs.right.get(), inputs.right_size, &b);
+	int an = bdiff_splitlines(left.c_str(), left.size(), &a);
+	int bn = bdiff_splitlines(right.c_str(), right.size(), &b);
 	struct bdiff_hunk l;
 	bdiff_diff(a, an, b, bn, &l);
 	free(a);
 	free(b);
 	bdiff_freehunks(l.next);
 	return 0; // Non-zero return values are reserved for future use.
 }
 
 #ifdef HG_FUZZER_INCLUDE_MAIN
 int main(int argc, char **argv)
 {
 	const char data[] = "asdf";
 	return LLVMFuzzerTestOneInput((const uint8_t *)data, 4);
 }
 #endif
 
 } // extern "C"