mirror of
https://github.com/fmtlib/fmt.git
synced 2024-11-29 13:21:05 +00:00
68 lines
2.2 KiB
C++
68 lines
2.2 KiB
C++
#ifndef FUZZER_COMMON_H
|
|
#define FUZZER_COMMON_H
|
|
|
|
// Copyright (c) 2019, Paul Dreik
|
|
// License: see LICENSE.rst in the fmt root directory
|
|
|
|
#include <cstdint> // std::uint8_t
|
|
#include <cstring> // memcpy
|
|
#include <type_traits> // trivially copyable
|
|
|
|
// one can format to either a string, or a buf. buf is faster,
|
|
// but one may be interested in formatting to a string instead to
|
|
// verify it works as intended. to avoid a combinatoric explosion,
|
|
// select this at compile time instead of dynamically from the fuzz data
|
|
#define FMT_FUZZ_FORMAT_TO_STRING 0
|
|
|
|
// if fmt is given a buffer that is separately allocated,
|
|
// chances that address sanitizer detects out of bound reads is
|
|
// much higher. However, it slows down the fuzzing.
|
|
#define FMT_FUZZ_SEPARATE_ALLOCATION 1
|
|
|
|
// To let the the fuzzer mutation be efficient at cross pollinating
|
|
// between different types, use a fixed size format.
|
|
// The same bit pattern, interpreted as another type,
|
|
// is likely interesting.
|
|
// For this, we must know the size of the largest possible type in use.
|
|
|
|
// There are some problems on travis, claiming Nfixed is not a constant
|
|
// expression which seems to be an issue with older versions of libstdc++
|
|
#if _GLIBCXX_RELEASE >= 7
|
|
# include <algorithm>
|
|
namespace fmt_fuzzer {
|
|
constexpr auto Nfixed = std::max(sizeof(long double), sizeof(std::intmax_t));
|
|
}
|
|
#else
|
|
namespace fmt_fuzzer {
|
|
constexpr auto Nfixed = 16;
|
|
}
|
|
#endif
|
|
|
|
namespace fmt_fuzzer {
|
|
// view data as a c char pointer.
|
|
template <typename T> inline const char* as_chars(const T* data) {
|
|
return static_cast<const char*>(static_cast<const void*>(data));
|
|
}
|
|
|
|
// view data as a byte pointer
|
|
template <typename T> inline const std::uint8_t* as_bytes(const T* data) {
|
|
return static_cast<const std::uint8_t*>(static_cast<const void*>(data));
|
|
}
|
|
|
|
// blits bytes from Data to form an (assumed trivially constructible) object
|
|
// of type Item
|
|
template <class Item> inline Item assignFromBuf(const std::uint8_t* Data) {
|
|
Item item{};
|
|
std::memcpy(&item, Data, sizeof(Item));
|
|
return item;
|
|
}
|
|
|
|
// reads a boolean value by looking at the first byte from Data
|
|
template <> inline bool assignFromBuf<bool>(const std::uint8_t* Data) {
|
|
return !!Data[0];
|
|
}
|
|
|
|
} // namespace fmt_fuzzer
|
|
|
|
#endif // FUZZER_COMMON_H
|