/*

 * 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 "FuzzedDataProvider.h"

extern "C" {

int LLVMFuzzerInitialize(int *argc, char ***argv)

{

	return 0;

}

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;

	}

	FuzzedDataProvider provider(Data, Size);

	std::string left = provider.ConsumeRandomLengthString(Size);

	std::string right = provider.ConsumeRemainingBytesAsString();

	mmfile_t a, b;

	a.ptr = (char *)left.c_str();

	a.size = left.size();

	b.ptr = (char *)right.c_str();

	b.size = 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.

}

} // extern "C"