/*

 * 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"