/*

 * xdiff.cc - fuzzer harness for thirdparty/xdiff

 *

 * 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 "thirdparty/xdiff/xdiff.h"

#include <inttypes.h>

#include <stdlib.h>

#include "fuzzutil.h"

extern "C" {

int hunk_consumer(long a1, long a2, long b1, long b2, void *priv)

{

	// TODO: probably also test returning -1 from this when things break?

	return 0;

}

int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size)

{

	// Don't allow fuzzer inputs larger than 100k, since we'll just bog

	// down and not accomplish much.

	if (Size > 100000) {

		return 0;

	}

	auto maybe_inputs = SplitInputs(Data, Size);

	if (!maybe_inputs) {

		return 0;

	}

	auto inputs = std::move(maybe_inputs.value());

	mmfile_t a, b;

	a.ptr = inputs.left.get();

	a.size = inputs.left_size;

	b.ptr = inputs.right.get();

	b.size = inputs.right_size;

	xpparam_t xpp = {

	    XDF_INDENT_HEURISTIC, /* flags */

	};

	xdemitconf_t xecfg = {

	    XDL_EMIT_BDIFFHUNK, /* flags */

	    hunk_consumer,      /* hunk_consume_func */

	};

	xdemitcb_t ecb = {

	    NULL, /* priv */

	};

	xdl_diff(&a, &b, &xpp, &xecfg, &ecb);

	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"