mirror of
https://github.com/fmtlib/fmt.git
synced 2024-12-03 23:01:03 +00:00
78 lines
2.4 KiB
C++
78 lines
2.4 KiB
C++
// Copyright (c) 2019, Paul Dreik
|
|
// For the license information refer to format.h.
|
|
|
|
#ifndef FUZZER_COMMON_H
|
|
#define FUZZER_COMMON_H
|
|
|
|
#include <fmt/core.h>
|
|
|
|
#include <cstdint> // std::uint8_t
|
|
#include <cstring> // memcpy
|
|
#include <vector>
|
|
|
|
// One can format to either a string, or a buffer. The latter 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
|
|
|
|
// The size of the largest possible type in use.
|
|
// 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.
|
|
constexpr auto fixed_size = 16;
|
|
|
|
// Casts data to a char pointer.
|
|
template <typename T> inline const char* as_chars(const T* data) {
|
|
return reinterpret_cast<const char*>(data);
|
|
}
|
|
|
|
// Casts data to a byte pointer.
|
|
template <typename T> inline const std::uint8_t* as_bytes(const T* data) {
|
|
return reinterpret_cast<const std::uint8_t*>(data);
|
|
}
|
|
|
|
// Blits bytes from data to form an (assumed trivially constructible) object
|
|
// of type Item.
|
|
template <class Item> inline Item assign_from_buf(const std::uint8_t* data) {
|
|
auto 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 assign_from_buf<bool>(const std::uint8_t* data) {
|
|
return *data != 0;
|
|
}
|
|
|
|
struct data_to_string {
|
|
#if FMT_FUZZ_SEPARATE_ALLOCATION
|
|
std::vector<char> buffer;
|
|
|
|
data_to_string(const uint8_t* data, size_t size, bool add_terminator = false)
|
|
: buffer(size + (add_terminator ? 1 : 0)) {
|
|
if (size) {
|
|
std::memcpy(buffer.data(), data, size);
|
|
}
|
|
}
|
|
|
|
fmt::string_view get() const { return {buffer.data(), buffer.size()}; }
|
|
#else
|
|
fmt::string_view sv;
|
|
|
|
data_to_string(const uint8_t* data, size_t size, bool = false)
|
|
: str(as_chars(data), size) {}
|
|
|
|
fmt::string_view get() const { return sv; }
|
|
#endif
|
|
|
|
const char* data() const { return get().data(); }
|
|
};
|
|
|
|
#endif // FUZZER_COMMON_H
|