1 // Copyright 2018 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "base/json/string_escape.h"
6
7 #include <memory>
8
9 // Entry point for LibFuzzer.
LLVMFuzzerTestOneInput(const uint8_t * data,size_t size)10 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
11 if (size < 2)
12 return 0;
13
14 const bool put_in_quotes = data[size - 1];
15
16 // Create a copy of input buffer, as otherwise we don't catch
17 // overflow that touches the last byte (which is used in put_in_quotes).
18 size_t actual_size_char8 = size - 1;
19 std::unique_ptr<char[]> input(new char[actual_size_char8]);
20 memcpy(input.get(), data, actual_size_char8);
21
22 base::StringPiece input_string(input.get(), actual_size_char8);
23 std::string escaped_string;
24 base::EscapeJSONString(input_string, put_in_quotes, &escaped_string);
25
26 // Test for wide-strings if available size is even.
27 if (actual_size_char8 & 1)
28 return 0;
29
30 size_t actual_size_char16 = actual_size_char8 / 2;
31 base::StringPiece16 input_string16(
32 reinterpret_cast<base::char16*>(input.get()), actual_size_char16);
33 escaped_string.clear();
34 base::EscapeJSONString(input_string16, put_in_quotes, &escaped_string);
35
36 return 0;
37 }
38