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annotate dep/fmt/test/fuzzing/fuzzer-common.h @ 377:1b0b8e746d83 default tip

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CI/windows: stupid msys2
author Paper <paper@tflc.us>
date Fri, 25 Jul 2025 12:40:25 -0400 (3 months ago)
parents 1faa72660932
children
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1 // Copyright (c) 2019, Paul Dreik
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2 // For the license information refer to format.h.
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3
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4 #ifndef FUZZER_COMMON_H
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5 #define FUZZER_COMMON_H
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6
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7 #include <fmt/core.h>
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8
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9 #include <cstdint> // std::uint8_t
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10 #include <cstring> // memcpy
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11 #include <vector>
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12
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13 // One can format to either a string, or a buffer. The latter is faster, but
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14 // one may be interested in formatting to a string instead to verify it works
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15 // as intended. To avoid a combinatoric explosion, select this at compile time
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16 // instead of dynamically from the fuzz data.
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17 #define FMT_FUZZ_FORMAT_TO_STRING 0
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18
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19 // If {fmt} is given a buffer that is separately allocated, chances that address
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20 // sanitizer detects out of bound reads is much higher. However, it slows down
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21 // the fuzzing.
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22 #define FMT_FUZZ_SEPARATE_ALLOCATION 1
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23
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24 // The size of the largest possible type in use.
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25 // To let the the fuzzer mutation be efficient at cross pollinating between
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26 // different types, use a fixed size format. The same bit pattern, interpreted
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27 // as another type, is likely interesting.
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28 constexpr auto fixed_size = 16;
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29
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30 // Casts data to a char pointer.
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31 template <typename T> inline const char* as_chars(const T* data) {
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32 return reinterpret_cast<const char*>(data);
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33 }
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34
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35 // Casts data to a byte pointer.
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36 template <typename T> inline const std::uint8_t* as_bytes(const T* data) {
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37 return reinterpret_cast<const std::uint8_t*>(data);
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38 }
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39
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40 // Blits bytes from data to form an (assumed trivially constructible) object
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41 // of type Item.
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42 template <class Item> inline Item assign_from_buf(const std::uint8_t* data) {
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43 auto item = Item();
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44 std::memcpy(&item, data, sizeof(Item));
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45 return item;
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46 }
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47
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48 // Reads a boolean value by looking at the first byte from data.
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49 template <> inline bool assign_from_buf<bool>(const std::uint8_t* data) {
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50 return *data != 0;
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51 }
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52
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53 struct data_to_string {
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54 #if FMT_FUZZ_SEPARATE_ALLOCATION
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55 std::vector<char> buffer;
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56
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57 data_to_string(const uint8_t* data, size_t size, bool add_terminator = false)
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58 : buffer(size + (add_terminator ? 1 : 0)) {
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59 if (size) {
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60 std::memcpy(buffer.data(), data, size);
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61 }
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62 }
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63
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64 fmt::string_view get() const { return {buffer.data(), buffer.size()}; }
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65 #else
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66 fmt::string_view sv;
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67
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68 data_to_string(const uint8_t* data, size_t size, bool = false)
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69 : str(as_chars(data), size) {}
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70
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71 fmt::string_view get() const { return sv; }
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72 #endif
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73
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74 const char* data() const { return get().data(); }
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75 };
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76
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77 #endif // FUZZER_COMMON_H