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55 lines
1.8 KiB
C++
55 lines
1.8 KiB
C++
// Copyright (c) 2019, Paul Dreik
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// For the license information refer to format.h.
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#ifndef FUZZER_COMMON_H
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#define FUZZER_COMMON_H
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#include <cstdint> // std::uint8_t
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#include <cstring> // memcpy
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// One can format to either a string, or a buffer. The latter is faster, but
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// one may be interested in formatting to a string instead to verify it works
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// as intended. To avoid a combinatoric explosion, select this at compile time
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// instead of dynamically from the fuzz data.
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#define FMT_FUZZ_FORMAT_TO_STRING 0
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// If {fmt} is given a buffer that is separately allocated, chances that address
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// sanitizer detects out of bound reads is much higher. However, it slows down
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// the fuzzing.
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#define FMT_FUZZ_SEPARATE_ALLOCATION 1
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namespace fmt_fuzzer {
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// The size of the largest possible type in use.
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// To let the the fuzzer mutation be efficient at cross pollinating between
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// different types, use a fixed size format. The same bit pattern, interpreted
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// as another type, is likely interesting.
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constexpr auto nfixed = 16;
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// Casts data to a char pointer.
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template <typename T> inline const char* as_chars(const T* data) {
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return reinterpret_cast<const char*>(data);
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}
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// Casts data to a byte pointer.
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template <typename T> inline const std::uint8_t* as_bytes(const T* data) {
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return reinterpret_cast<const std::uint8_t*>(data);
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}
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// Blits bytes from data to form an (assumed trivially constructible) object
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// of type Item.
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template <class Item> inline Item assignFromBuf(const std::uint8_t* data) {
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auto item = Item();
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std::memcpy(&item, data, sizeof(Item));
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return item;
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}
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// Reads a boolean value by looking at the first byte from data.
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template <> inline bool assignFromBuf<bool>(const std::uint8_t* data) {
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return *data != 0;
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}
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} // namespace fmt_fuzzer
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#endif // FUZZER_COMMON_H
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