Use re2_fuzzer stored in re2 repository, remove old version.

testing/libfuzzer/fuzzers/re2_fuzzer.cc

-// Copyright 2016 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-// Copyright 2016 The RE2 Authors.  All Rights Reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-#include <stddef.h>
-#include <stdint.h>
-
-#include <map>
-#include <string>
-
-#include "re2/re2.h"
-
-using re2::StringPiece;
-using std::string;
-
-// NOT static, NOT signed.
-uint8_t dummy = 0;
-
-void Test(StringPiece pattern, const RE2::Options& options, StringPiece text) {
-  RE2 re(pattern, options);
-  if (!re.ok())
-    return;
-
-  // Don't waste time fuzzing high-fanout programs.
-  // (They can also cause bug reports due to fuzzer timeouts.)
-  std::map<int, int> histogram;
-  int fanout = re.ProgramFanout(&histogram);
-  if (fanout > 9)
-    return;
-
-  StringPiece sp1, sp2, sp3, sp4;
-  string s1, s2, s3, s4;
-  int i1, i2, i3, i4;
-  double d1, d2, d3, d4;
-
-  RE2::FullMatch(text, re, &sp1, &sp2, &sp3, &sp4);
-  RE2::PartialMatch(text, re, &s1, &s2, &s3, &s4);
-
-  sp1 = sp2 = text;
-  RE2::Consume(&sp1, re, &i1, &i2, &i3, &i4);
-  RE2::FindAndConsume(&sp2, re, &d1, &d2, &d3, &d4);
-
-  s3 = s4 = text.ToString();
-  RE2::Replace(&s3, re, "");
-  RE2::GlobalReplace(&s4, re, "");
-
-  // Exercise some other API functionality.
-  dummy += re.NumberOfCapturingGroups();
-  dummy += RE2::QuoteMeta(pattern).size();
-}
-
-// Entry point for libFuzzer.
-extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
-  if (size == 0 || size > 1024)
-    return 0;
-
-  // The one-at-a-time hash by Bob Jenkins.
-  uint32_t hash = 0;
-  for (size_t i = 0; i < size; i++) {
-    hash += data[i];
-    hash += (hash << 10);
-    hash ^= (hash >> 6);
-  }
-  hash += (hash << 3);
-  hash ^= (hash >> 11);
-  hash += (hash << 15);
-
-  RE2::Options options;
-  options.set_log_errors(false);
-  options.set_encoding(hash & 1 ? RE2::Options::EncodingLatin1
-                                : RE2::Options::EncodingUTF8);
-  options.set_posix_syntax(hash & 2);
-  options.set_longest_match(hash & 4);
-  options.set_literal(hash & 8);
-  options.set_never_nl(hash & 16);
-  options.set_dot_nl(hash & 32);
-  options.set_never_capture(hash & 64);
-  options.set_case_sensitive(hash & 128);
-  options.set_perl_classes(hash & 256);
-  options.set_word_boundary(hash & 512);
-  options.set_one_line(hash & 1024);
-
-  const char* ptr = reinterpret_cast<const char*>(data);
-  int len = static_cast<int>(size);
-
-  StringPiece pattern(ptr, len);
-  StringPiece text(ptr, len);
-  Test(pattern, options, text);
-
-  for (int i = 2; i <= 4; i++) {
-    if (len < i)
-      break;
-
-    int frac = len / i;
-    pattern = StringPiece(ptr, frac);
-    text = StringPiece(ptr + frac, len - frac);
-    Test(pattern, options, text);
-  }
-
-  return 0;
-}