contrib/fuzz/bdiff.cc

wireprototypes: clarify documentation of getbundle argument types

It seems like it was a mix of what the Python code would see and what
was sent over the wire. I've tried to clarify both the type seen in
Python and how it's transmitted.

Differential Revision: https://phab.mercurial-scm.org/D6871

/*
 * 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"

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());

	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);
	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"