1 // Copyright 2015 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 #include <stddef.h> 5 #include <stdint.h> 6 #include <clocale> 7 #include <string> 8 9 #include "flatbuffers/idl.h" 10 #include "test_init.h" 11 12 static constexpr size_t kMinInputLength = 1; 13 static constexpr size_t kMaxInputLength = 16384; 14 15 static constexpr uint8_t flags_strict_json = 0x80; 16 static constexpr uint8_t flags_skip_unexpected_fields_in_json = 0x40; 17 static constexpr uint8_t flags_allow_non_utf8 = 0x20; 18 19 // Utility for test run. 20 OneTimeTestInit OneTimeTestInit::one_time_init_; 21 LLVMFuzzerTestOneInput(const uint8_t * data,size_t size)22extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) { 23 // Reserve one byte for Parser flags and one byte for repetition counter. 24 if (size < 3) return 0; 25 const uint8_t flags = data[0]; 26 (void)data[1]; // reserved 27 data += 2; 28 size -= 2; // bypass 29 30 const std::string original(reinterpret_cast<const char *>(data), size); 31 auto input = std::string(original.c_str()); // until '\0' 32 if (input.size() < kMinInputLength || input.size() > kMaxInputLength) 33 return 0; 34 35 flatbuffers::IDLOptions opts; 36 opts.strict_json = (flags & flags_strict_json); 37 opts.skip_unexpected_fields_in_json = 38 (flags & flags_skip_unexpected_fields_in_json); 39 opts.allow_non_utf8 = (flags & flags_allow_non_utf8); 40 41 flatbuffers::Parser parser(opts); 42 43 // Guarantee 0-termination in the input. 44 auto parse_input = input.c_str(); 45 46 // Check Parser. 47 parser.Parse(parse_input); 48 // TODO: 49 // Need to add additional checks for inputs passed Parse(parse_input) successfully: 50 // 1. Serialization to bfbs. 51 // 2. Generation of a default object. 52 // 3. Verification of the object using reflection. 53 // 3. Printing to json. 54 return 0; 55 } 56