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annotate dep/fmt/test/fuzzing/chrono-duration.cc @ 343:1faa72660932

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*: transfer back to cmake from autotools autotools just made lots of things more complicated than they should have and many things broke (i.e. translations)
author Paper <paper@paper.us.eu.org>
date Thu, 20 Jun 2024 05:56:06 -0400
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343
1faa72660932 *: transfer back to cmake from autotools
Paper <paper@paper.us.eu.org>
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1 // Copyright (c) 2019, Paul Dreik
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Paper <paper@paper.us.eu.org>
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2 // For the license information refer to format.h.
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3
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4 #include <fmt/chrono.h>
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5
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6 #include <cstdint>
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7
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8 #include "fuzzer-common.h"
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9
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10 template <typename Period, typename Rep>
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11 void invoke_inner(fmt::string_view format_str, Rep rep) {
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12 auto value = std::chrono::duration<Rep, Period>(rep);
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13 try {
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14 #if FMT_FUZZ_FORMAT_TO_STRING
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15 std::string message = fmt::format(format_str, value);
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16 #else
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17 auto buf = fmt::memory_buffer();
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18 fmt::format_to(std::back_inserter(buf), format_str, value);
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19 #endif
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20 } catch (std::exception&) {
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21 }
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22 }
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23
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24 // Rep is a duration's representation type.
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25 template <typename Rep>
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26 void invoke_outer(const uint8_t* data, size_t size, int period) {
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27 // Always use a fixed location of the data.
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28 static_assert(sizeof(Rep) <= fixed_size, "fixed size is too small");
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29 if (size <= fixed_size + 1) return;
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30
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31 const Rep rep = assign_from_buf<Rep>(data);
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32 data += fixed_size;
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33 size -= fixed_size;
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34
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35 // data is already allocated separately in libFuzzer so reading past the end
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36 // will most likely be detected anyway.
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37 const auto format_str = fmt::string_view(as_chars(data), size);
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38
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39 // yocto, zepto, zetta and yotta are not handled.
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40 switch (period) {
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41 case 1:
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42 invoke_inner<std::atto>(format_str, rep);
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43 break;
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44 case 2:
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45 invoke_inner<std::femto>(format_str, rep);
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46 break;
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47 case 3:
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48 invoke_inner<std::pico>(format_str, rep);
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49 break;
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50 case 4:
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51 invoke_inner<std::nano>(format_str, rep);
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52 break;
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53 case 5:
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54 invoke_inner<std::micro>(format_str, rep);
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55 break;
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56 case 6:
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57 invoke_inner<std::milli>(format_str, rep);
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58 break;
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59 case 7:
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60 invoke_inner<std::centi>(format_str, rep);
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61 break;
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62 case 8:
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63 invoke_inner<std::deci>(format_str, rep);
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64 break;
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65 case 9:
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66 invoke_inner<std::deca>(format_str, rep);
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67 break;
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68 case 10:
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69 invoke_inner<std::kilo>(format_str, rep);
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70 break;
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71 case 11:
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72 invoke_inner<std::mega>(format_str, rep);
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73 break;
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74 case 12:
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75 invoke_inner<std::giga>(format_str, rep);
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76 break;
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77 case 13:
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78 invoke_inner<std::tera>(format_str, rep);
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79 break;
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80 case 14:
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81 invoke_inner<std::peta>(format_str, rep);
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82 break;
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83 case 15:
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84 invoke_inner<std::exa>(format_str, rep);
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85 break;
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86 }
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87 }
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88
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89 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
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90 if (size <= 4) return 0;
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91
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92 const auto representation = data[0];
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93 const auto period = data[1];
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94 data += 2;
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95 size -= 2;
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96
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97 switch (representation) {
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98 case 1:
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99 invoke_outer<char>(data, size, period);
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100 break;
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101 case 2:
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102 invoke_outer<signed char>(data, size, period);
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103 break;
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104 case 3:
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105 invoke_outer<unsigned char>(data, size, period);
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106 break;
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107 case 4:
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108 invoke_outer<short>(data, size, period);
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109 break;
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110 case 5:
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111 invoke_outer<unsigned short>(data, size, period);
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112 break;
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113 case 6:
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114 invoke_outer<int>(data, size, period);
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115 break;
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116 case 7:
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117 invoke_outer<unsigned int>(data, size, period);
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118 break;
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119 case 8:
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120 invoke_outer<long>(data, size, period);
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121 break;
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122 case 9:
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123 invoke_outer<unsigned long>(data, size, period);
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124 break;
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125 case 10:
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126 invoke_outer<float>(data, size, period);
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127 break;
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128 case 11:
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129 invoke_outer<double>(data, size, period);
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130 break;
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131 case 12:
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132 invoke_outer<long double>(data, size, period);
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133 break;
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134 }
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135 return 0;
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136 }