LCOV - code coverage report
Current view: top level - src/test/fuzz - FuzzedDataProvider.h (source / functions) Hit Total Coverage
Test: fuzz_coverage.info Lines: 23 114 20.2 %
Date: 2023-11-12 01:39:15 Functions: 10 66 15.2 %
Branches: 23 176 13.1 %

           Branch data     Line data    Source code
       1                 :            : //===- FuzzedDataProvider.h - Utility header for fuzz targets ---*- C++ -* ===//
       2                 :            : //
       3                 :            : // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
       4                 :            : // See https://llvm.org/LICENSE.txt for license information.
       5                 :            : // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
       6                 :            : //
       7                 :            : //===----------------------------------------------------------------------===//
       8                 :            : // A single header library providing an utility class to break up an array of
       9                 :            : // bytes. Whenever run on the same input, provides the same output, as long as
      10                 :            : // its methods are called in the same order, with the same arguments.
      11                 :            : //===----------------------------------------------------------------------===//
      12                 :            : 
      13                 :            : #ifndef LLVM_FUZZER_FUZZED_DATA_PROVIDER_H_
      14                 :            : #define LLVM_FUZZER_FUZZED_DATA_PROVIDER_H_
      15                 :            : 
      16                 :            : #include <algorithm>
      17                 :            : #include <array>
      18                 :            : #include <climits>
      19                 :            : #include <cstddef>
      20                 :            : #include <cstdint>
      21                 :            : #include <cstring>
      22                 :            : #include <initializer_list>
      23                 :            : #include <limits>
      24                 :            : #include <string>
      25                 :            : #include <type_traits>
      26                 :            : #include <utility>
      27                 :            : #include <vector>
      28                 :            : 
      29                 :            : // In addition to the comments below, the API is also briefly documented at
      30                 :            : // https://github.com/google/fuzzing/blob/master/docs/split-inputs.md#fuzzed-data-provider
      31                 :            : class FuzzedDataProvider {
      32                 :            :  public:
      33                 :            :   // |data| is an array of length |size| that the FuzzedDataProvider wraps to
      34                 :            :   // provide more granular access. |data| must outlive the FuzzedDataProvider.
      35                 :        542 :   FuzzedDataProvider(const uint8_t *data, size_t size)
      36                 :        542 :       : data_ptr_(data), remaining_bytes_(size) {}
      37                 :            :   ~FuzzedDataProvider() = default;
      38                 :            : 
      39                 :            :   // See the implementation below (after the class definition) for more verbose
      40                 :            :   // comments for each of the methods.
      41                 :            : 
      42                 :            :   // Methods returning std::vector of bytes. These are the most popular choice
      43                 :            :   // when splitting fuzzing input into pieces, as every piece is put into a
      44                 :            :   // separate buffer (i.e. ASan would catch any under-/overflow) and the memory
      45                 :            :   // will be released automatically.
      46                 :            :   template <typename T> std::vector<T> ConsumeBytes(size_t num_bytes);
      47                 :            :   template <typename T>
      48                 :            :   std::vector<T> ConsumeBytesWithTerminator(size_t num_bytes, T terminator = 0);
      49                 :            :   template <typename T> std::vector<T> ConsumeRemainingBytes();
      50                 :            : 
      51                 :            :   // Methods returning strings. Use only when you need a std::string or a null
      52                 :            :   // terminated C-string. Otherwise, prefer the methods returning std::vector.
      53                 :            :   std::string ConsumeBytesAsString(size_t num_bytes);
      54                 :            :   std::string ConsumeRandomLengthString(size_t max_length);
      55                 :            :   std::string ConsumeRandomLengthString();
      56                 :            :   std::string ConsumeRemainingBytesAsString();
      57                 :            : 
      58                 :            :   // Methods returning integer values.
      59                 :            :   template <typename T> T ConsumeIntegral();
      60                 :            :   template <typename T> T ConsumeIntegralInRange(T min, T max);
      61                 :            : 
      62                 :            :   // Methods returning floating point values.
      63                 :            :   template <typename T> T ConsumeFloatingPoint();
      64                 :            :   template <typename T> T ConsumeFloatingPointInRange(T min, T max);
      65                 :            : 
      66                 :            :   // 0 <= return value <= 1.
      67                 :            :   template <typename T> T ConsumeProbability();
      68                 :            : 
      69                 :            :   bool ConsumeBool();
      70                 :            : 
      71                 :            :   // Returns a value chosen from the given enum.
      72                 :            :   template <typename T> T ConsumeEnum();
      73                 :            : 
      74                 :            :   // Returns a value from the given array.
      75                 :            :   template <typename T, size_t size> T PickValueInArray(const T (&array)[size]);
      76                 :            :   template <typename T, size_t size>
      77                 :            :   T PickValueInArray(const std::array<T, size> &array);
      78                 :            :   template <typename T> T PickValueInArray(std::initializer_list<const T> list);
      79                 :            : 
      80                 :            :   // Writes data to the given destination and returns number of bytes written.
      81                 :            :   size_t ConsumeData(void *destination, size_t num_bytes);
      82                 :            : 
      83                 :            :   // Reports the remaining bytes available for fuzzed input.
      84                 :          0 :   size_t remaining_bytes() { return remaining_bytes_; }
      85                 :            : 
      86                 :            :  private:
      87                 :            :   FuzzedDataProvider(const FuzzedDataProvider &) = delete;
      88                 :            :   FuzzedDataProvider &operator=(const FuzzedDataProvider &) = delete;
      89                 :            : 
      90                 :            :   void CopyAndAdvance(void *destination, size_t num_bytes);
      91                 :            : 
      92                 :            :   void Advance(size_t num_bytes);
      93                 :            : 
      94                 :            :   template <typename T>
      95                 :            :   std::vector<T> ConsumeBytes(size_t size, size_t num_bytes);
      96                 :            : 
      97                 :            :   template <typename TS, typename TU> TS ConvertUnsignedToSigned(TU value);
      98                 :            : 
      99                 :            :   const uint8_t *data_ptr_;
     100                 :            :   size_t remaining_bytes_;
     101                 :            : };
     102                 :            : 
     103                 :            : // Returns a std::vector containing |num_bytes| of input data. If fewer than
     104                 :            : // |num_bytes| of data remain, returns a shorter std::vector containing all
     105                 :            : // of the data that's left. Can be used with any byte sized type, such as
     106                 :            : // char, unsigned char, uint8_t, etc.
     107                 :            : template <typename T>
     108                 :          0 : std::vector<T> FuzzedDataProvider::ConsumeBytes(size_t num_bytes) {
     109                 :          0 :   num_bytes = std::min(num_bytes, remaining_bytes_);
     110                 :          0 :   return ConsumeBytes<T>(num_bytes, num_bytes);
     111                 :            : }
     112                 :            : 
     113                 :            : // Similar to |ConsumeBytes|, but also appends the terminator value at the end
     114                 :            : // of the resulting vector. Useful, when a mutable null-terminated C-string is
     115                 :            : // needed, for example. But that is a rare case. Better avoid it, if possible,
     116                 :            : // and prefer using |ConsumeBytes| or |ConsumeBytesAsString| methods.
     117                 :            : template <typename T>
     118                 :            : std::vector<T> FuzzedDataProvider::ConsumeBytesWithTerminator(size_t num_bytes,
     119                 :            :                                                               T terminator) {
     120                 :            :   num_bytes = std::min(num_bytes, remaining_bytes_);
     121                 :            :   std::vector<T> result = ConsumeBytes<T>(num_bytes + 1, num_bytes);
     122                 :            :   result.back() = terminator;
     123                 :            :   return result;
     124                 :            : }
     125                 :            : 
     126                 :            : // Returns a std::vector containing all remaining bytes of the input data.
     127                 :            : template <typename T>
     128                 :          0 : std::vector<T> FuzzedDataProvider::ConsumeRemainingBytes() {
     129                 :          0 :   return ConsumeBytes<T>(remaining_bytes_);
     130                 :            : }
     131                 :            : 
     132                 :            : // Returns a std::string containing |num_bytes| of input data. Using this and
     133                 :            : // |.c_str()| on the resulting string is the best way to get an immutable
     134                 :            : // null-terminated C string. If fewer than |num_bytes| of data remain, returns
     135                 :            : // a shorter std::string containing all of the data that's left.
     136                 :          0 : inline std::string FuzzedDataProvider::ConsumeBytesAsString(size_t num_bytes) {
     137                 :            :   static_assert(sizeof(std::string::value_type) == sizeof(uint8_t),
     138                 :            :                 "ConsumeBytesAsString cannot convert the data to a string.");
     139                 :            : 
     140                 :          0 :   num_bytes = std::min(num_bytes, remaining_bytes_);
     141 [ #  # ][ #  # ]:          0 :   std::string result(
     142                 :          0 :       reinterpret_cast<const std::string::value_type *>(data_ptr_), num_bytes);
     143         [ #  # ]:          0 :   Advance(num_bytes);
     144                 :          0 :   return result;
     145         [ #  # ]:          0 : }
     146                 :            : 
     147                 :            : // Returns a std::string of length from 0 to |max_length|. When it runs out of
     148                 :            : // input data, returns what remains of the input. Designed to be more stable
     149                 :            : // with respect to a fuzzer inserting characters than just picking a random
     150                 :            : // length and then consuming that many bytes with |ConsumeBytes|.
     151                 :            : inline std::string
     152                 :          0 : FuzzedDataProvider::ConsumeRandomLengthString(size_t max_length) {
     153                 :            :   // Reads bytes from the start of |data_ptr_|. Maps "\\" to "\", and maps "\"
     154                 :            :   // followed by anything else to the end of the string. As a result of this
     155                 :            :   // logic, a fuzzer can insert characters into the string, and the string
     156                 :            :   // will be lengthened to include those new characters, resulting in a more
     157                 :            :   // stable fuzzer than picking the length of a string independently from
     158                 :            :   // picking its contents.
     159                 :          0 :   std::string result;
     160                 :            : 
     161                 :            :   // Reserve the anticipated capaticity to prevent several reallocations.
     162 [ #  # ][ #  # ]:          0 :   result.reserve(std::min(max_length, remaining_bytes_));
     163 [ #  # ][ #  # ]:          0 :   for (size_t i = 0; i < max_length && remaining_bytes_ != 0; ++i) {
     164         [ #  # ]:          0 :     char next = ConvertUnsignedToSigned<char>(data_ptr_[0]);
     165         [ #  # ]:          0 :     Advance(1);
     166 [ #  # ][ #  # ]:          0 :     if (next == '\\' && remaining_bytes_ != 0) {
     167         [ #  # ]:          0 :       next = ConvertUnsignedToSigned<char>(data_ptr_[0]);
     168         [ #  # ]:          0 :       Advance(1);
     169         [ #  # ]:          0 :       if (next != '\\')
     170                 :          0 :         break;
     171                 :          0 :     }
     172         [ #  # ]:          0 :     result += next;
     173                 :          0 :   }
     174                 :            : 
     175                 :          0 :   result.shrink_to_fit();
     176                 :          0 :   return result;
     177         [ #  # ]:          0 : }
     178                 :            : 
     179                 :            : // Returns a std::string of length from 0 to |remaining_bytes_|.
     180                 :          0 : inline std::string FuzzedDataProvider::ConsumeRandomLengthString() {
     181                 :          0 :   return ConsumeRandomLengthString(remaining_bytes_);
     182                 :            : }
     183                 :            : 
     184                 :            : // Returns a std::string containing all remaining bytes of the input data.
     185                 :            : // Prefer using |ConsumeRemainingBytes| unless you actually need a std::string
     186                 :            : // object.
     187                 :          0 : inline std::string FuzzedDataProvider::ConsumeRemainingBytesAsString() {
     188                 :          0 :   return ConsumeBytesAsString(remaining_bytes_);
     189                 :            : }
     190                 :            : 
     191                 :            : // Returns a number in the range [Type's min, Type's max]. The value might
     192                 :            : // not be uniformly distributed in the given range. If there's no input data
     193                 :            : // left, always returns |min|.
     194                 :     737170 : template <typename T> T FuzzedDataProvider::ConsumeIntegral() {
     195                 :    1474340 :   return ConsumeIntegralInRange(std::numeric_limits<T>::min(),
     196                 :     737170 :                                 std::numeric_limits<T>::max());
     197                 :            : }
     198                 :            : 
     199                 :            : // Returns a number in the range [min, max] by consuming bytes from the
     200                 :            : // input data. The value might not be uniformly distributed in the given
     201                 :            : // range. If there's no input data left, always returns |min|. |min| must
     202                 :            : // be less than or equal to |max|.
     203                 :            : template <typename T>
     204                 :    1150593 : T FuzzedDataProvider::ConsumeIntegralInRange(T min, T max) {
     205                 :            :   static_assert(std::is_integral<T>::value, "An integral type is required.");
     206                 :            :   static_assert(sizeof(T) <= sizeof(uint64_t), "Unsupported integral type.");
     207                 :            : 
     208 [ -  + ][ -  + ]:    1150593 :   if (min > max)
         [ -  + ][ #  # ]
         [ #  # ][ #  # ]
         [ #  # ][ #  # ]
                 [ #  # ]
     209                 :          0 :     abort();
     210                 :            : 
     211                 :            :   // Use the biggest type possible to hold the range and the result.
     212                 :    1150593 :   uint64_t range = static_cast<uint64_t>(max) - static_cast<uint64_t>(min);
     213                 :    1150593 :   uint64_t result = 0;
     214                 :    1150593 :   size_t offset = 0;
     215                 :            : 
     216 [ +  + ][ +  + ]:    3343875 :   while (offset < sizeof(T) * CHAR_BIT && (range >> offset) > 0 &&
         [ +  + ][ +  - ]
         [ +  + ][ +  + ]
         [ +  - ][ +  + ]
         [ +  + ][ #  # ]
         [ #  # ][ #  # ]
         [ #  # ][ #  # ]
         [ #  # ][ #  # ]
         [ #  # ][ #  # ]
         [ #  # ][ #  # ]
         [ #  # ][ #  # ]
         [ #  # ][ #  # ]
         [ #  # ][ #  # ]
                 [ #  # ]
     217                 :    1454243 :          remaining_bytes_ != 0) {
     218                 :            :     // Pull bytes off the end of the seed data. Experimentally, this seems to
     219                 :            :     // allow the fuzzer to more easily explore the input space. This makes
     220                 :            :     // sense, since it works by modifying inputs that caused new code to run,
     221                 :            :     // and this data is often used to encode length of data read by
     222                 :            :     // |ConsumeBytes|. Separating out read lengths makes it easier modify the
     223                 :            :     // contents of the data that is actually read.
     224                 :    1050263 :     --remaining_bytes_;
     225                 :    1050263 :     result = (result << CHAR_BIT) | data_ptr_[remaining_bytes_];
     226                 :    1050263 :     offset += CHAR_BIT;
     227                 :            :   }
     228                 :            : 
     229                 :            :   // Avoid division by 0, in case |range + 1| results in overflow.
     230 [ -  + ][ -  + ]:    1150593 :   if (range != std::numeric_limits<decltype(range)>::max())
         [ -  + ][ #  # ]
         [ #  # ][ #  # ]
         [ #  # ][ #  # ]
                 [ #  # ]
     231                 :    1150593 :     result = result % (range + 1);
     232                 :            : 
     233                 :    1150593 :   return static_cast<T>(static_cast<uint64_t>(min) + result);
     234                 :            : }
     235                 :            : 
     236                 :            : // Returns a floating point value in the range [Type's lowest, Type's max] by
     237                 :            : // consuming bytes from the input data. If there's no input data left, always
     238                 :            : // returns approximately 0.
     239                 :          0 : template <typename T> T FuzzedDataProvider::ConsumeFloatingPoint() {
     240                 :          0 :   return ConsumeFloatingPointInRange<T>(std::numeric_limits<T>::lowest(),
     241                 :          0 :                                         std::numeric_limits<T>::max());
     242                 :            : }
     243                 :            : 
     244                 :            : // Returns a floating point value in the given range by consuming bytes from
     245                 :            : // the input data. If there's no input data left, returns |min|. Note that
     246                 :            : // |min| must be less than or equal to |max|.
     247                 :            : template <typename T>
     248                 :          0 : T FuzzedDataProvider::ConsumeFloatingPointInRange(T min, T max) {
     249 [ #  # ][ #  # ]:          0 :   if (min > max)
     250                 :          0 :     abort();
     251                 :            : 
     252                 :          0 :   T range = .0;
     253                 :          0 :   T result = min;
     254                 :          0 :   constexpr T zero(.0);
     255 [ #  # ][ #  # ]:          0 :   if (max > zero && min < zero && max > min + std::numeric_limits<T>::max()) {
         [ #  # ][ #  # ]
         [ #  # ][ #  # ]
     256                 :            :     // The diff |max - min| would overflow the given floating point type. Use
     257                 :            :     // the half of the diff as the range and consume a bool to decide whether
     258                 :            :     // the result is in the first of the second part of the diff.
     259                 :          0 :     range = (max / 2.0) - (min / 2.0);
     260 [ #  # ][ #  # ]:          0 :     if (ConsumeBool()) {
     261                 :          0 :       result += range;
     262                 :          0 :     }
     263                 :          0 :   } else {
     264                 :          0 :     range = max - min;
     265                 :            :   }
     266                 :            : 
     267                 :          0 :   return result + range * ConsumeProbability<T>();
     268                 :            : }
     269                 :            : 
     270                 :            : // Returns a floating point number in the range [0.0, 1.0]. If there's no
     271                 :            : // input data left, always returns 0.
     272                 :          0 : template <typename T> T FuzzedDataProvider::ConsumeProbability() {
     273                 :            :   static_assert(std::is_floating_point<T>::value,
     274                 :            :                 "A floating point type is required.");
     275                 :            : 
     276                 :            :   // Use different integral types for different floating point types in order
     277                 :            :   // to provide better density of the resulting values.
     278                 :            :   using IntegralType =
     279                 :            :       typename std::conditional<(sizeof(T) <= sizeof(uint32_t)), uint32_t,
     280                 :            :                                 uint64_t>::type;
     281                 :            : 
     282                 :          0 :   T result = static_cast<T>(ConsumeIntegral<IntegralType>());
     283                 :          0 :   result /= static_cast<T>(std::numeric_limits<IntegralType>::max());
     284                 :          0 :   return result;
     285                 :            : }
     286                 :            : 
     287                 :            : // Reads one byte and returns a bool, or false when no data remains.
     288                 :     609811 : inline bool FuzzedDataProvider::ConsumeBool() {
     289                 :     609811 :   return 1 & ConsumeIntegral<uint8_t>();
     290                 :            : }
     291                 :            : 
     292                 :            : // Returns an enum value. The enum must start at 0 and be contiguous. It must
     293                 :            : // also contain |kMaxValue| aliased to its largest (inclusive) value. Such as:
     294                 :            : // enum class Foo { SomeValue, OtherValue, kMaxValue = OtherValue };
     295                 :            : template <typename T> T FuzzedDataProvider::ConsumeEnum() {
     296                 :            :   static_assert(std::is_enum<T>::value, "|T| must be an enum type.");
     297                 :            :   return static_cast<T>(
     298                 :            :       ConsumeIntegralInRange<uint32_t>(0, static_cast<uint32_t>(T::kMaxValue)));
     299                 :            : }
     300                 :            : 
     301                 :            : // Returns a copy of the value selected from the given fixed-size |array|.
     302                 :            : template <typename T, size_t size>
     303                 :          0 : T FuzzedDataProvider::PickValueInArray(const T (&array)[size]) {
     304                 :            :   static_assert(size > 0, "The array must be non empty.");
     305                 :          0 :   return array[ConsumeIntegralInRange<size_t>(0, size - 1)];
     306                 :            : }
     307                 :            : 
     308                 :            : template <typename T, size_t size>
     309                 :          0 : T FuzzedDataProvider::PickValueInArray(const std::array<T, size> &array) {
     310                 :            :   static_assert(size > 0, "The array must be non empty.");
     311                 :          0 :   return array[ConsumeIntegralInRange<size_t>(0, size - 1)];
     312                 :            : }
     313                 :            : 
     314                 :            : template <typename T>
     315                 :      74093 : T FuzzedDataProvider::PickValueInArray(std::initializer_list<const T> list) {
     316                 :            :   // TODO(Dor1s): switch to static_assert once C++14 is allowed.
     317 [ #  # ][ +  - ]:      74093 :   if (!list.size())
     318                 :          0 :     abort();
     319                 :            : 
     320                 :      74093 :   return *(list.begin() + ConsumeIntegralInRange<size_t>(0, list.size() - 1));
     321                 :            : }
     322                 :            : 
     323                 :            : // Writes |num_bytes| of input data to the given destination pointer. If there
     324                 :            : // is not enough data left, writes all remaining bytes. Return value is the
     325                 :            : // number of bytes written.
     326                 :            : // In general, it's better to avoid using this function, but it may be useful
     327                 :            : // in cases when it's necessary to fill a certain buffer or object with
     328                 :            : // fuzzing data.
     329                 :          0 : inline size_t FuzzedDataProvider::ConsumeData(void *destination,
     330                 :            :                                               size_t num_bytes) {
     331                 :          0 :   num_bytes = std::min(num_bytes, remaining_bytes_);
     332                 :          0 :   CopyAndAdvance(destination, num_bytes);
     333                 :          0 :   return num_bytes;
     334                 :            : }
     335                 :            : 
     336                 :            : // Private methods.
     337                 :          0 : inline void FuzzedDataProvider::CopyAndAdvance(void *destination,
     338                 :            :                                                size_t num_bytes) {
     339                 :          0 :   std::memcpy(destination, data_ptr_, num_bytes);
     340                 :          0 :   Advance(num_bytes);
     341                 :          0 : }
     342                 :            : 
     343                 :          0 : inline void FuzzedDataProvider::Advance(size_t num_bytes) {
     344         [ #  # ]:          0 :   if (num_bytes > remaining_bytes_)
     345                 :          0 :     abort();
     346                 :            : 
     347                 :          0 :   data_ptr_ += num_bytes;
     348                 :          0 :   remaining_bytes_ -= num_bytes;
     349                 :          0 : }
     350                 :            : 
     351                 :            : template <typename T>
     352                 :          0 : std::vector<T> FuzzedDataProvider::ConsumeBytes(size_t size, size_t num_bytes) {
     353                 :            :   static_assert(sizeof(T) == sizeof(uint8_t), "Incompatible data type.");
     354                 :            : 
     355                 :            :   // The point of using the size-based constructor below is to increase the
     356                 :            :   // odds of having a vector object with capacity being equal to the length.
     357                 :            :   // That part is always implementation specific, but at least both libc++ and
     358                 :            :   // libstdc++ allocate the requested number of bytes in that constructor,
     359                 :            :   // which seems to be a natural choice for other implementations as well.
     360                 :            :   // To increase the odds even more, we also call |shrink_to_fit| below.
     361 [ #  # ][ #  # ]:          0 :   std::vector<T> result(size);
     362 [ #  # ][ #  # ]:          0 :   if (size == 0) {
     363 [ #  # ][ #  # ]:          0 :     if (num_bytes != 0)
     364                 :          0 :       abort();
     365                 :          0 :     return result;
     366                 :            :   }
     367                 :            : 
     368 [ #  # ][ #  # ]:          0 :   CopyAndAdvance(result.data(), num_bytes);
     369                 :            : 
     370                 :            :   // Even though |shrink_to_fit| is also implementation specific, we expect it
     371                 :            :   // to provide an additional assurance in case vector's constructor allocated
     372                 :            :   // a buffer which is larger than the actual amount of data we put inside it.
     373 [ #  # ][ #  # ]:          0 :   result.shrink_to_fit();
     374                 :          0 :   return result;
     375 [ #  # ][ #  # ]:          0 : }
     376                 :            : 
     377                 :            : template <typename TS, typename TU>
     378                 :          0 : TS FuzzedDataProvider::ConvertUnsignedToSigned(TU value) {
     379                 :            :   static_assert(sizeof(TS) == sizeof(TU), "Incompatible data types.");
     380                 :            :   static_assert(!std::numeric_limits<TU>::is_signed,
     381                 :            :                 "Source type must be unsigned.");
     382                 :            : 
     383                 :            :   // TODO(Dor1s): change to `if constexpr` once C++17 becomes mainstream.
     384                 :            :   if (std::numeric_limits<TS>::is_modulo)
     385                 :            :     return static_cast<TS>(value);
     386                 :            : 
     387                 :            :   // Avoid using implementation-defined unsigned to signed conversions.
     388                 :            :   // To learn more, see https://stackoverflow.com/questions/13150449.
     389         [ #  # ]:          0 :   if (value <= std::numeric_limits<TS>::max()) {
     390                 :          0 :     return static_cast<TS>(value);
     391                 :            :   } else {
     392                 :          0 :     constexpr auto TS_min = std::numeric_limits<TS>::min();
     393                 :          0 :     return TS_min + static_cast<TS>(value - TS_min);
     394                 :            :   }
     395                 :          0 : }
     396                 :            : 
     397                 :            : #endif // LLVM_FUZZER_FUZZED_DATA_PROVIDER_H_

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