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68 lines
2.2 KiB
C++
68 lines
2.2 KiB
C++
#ifndef FUZZER_COMMON_H
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#define FUZZER_COMMON_H
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// Copyright (c) 2019, Paul Dreik
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// License: see LICENSE.rst in the fmt root directory
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#include <cstdint> // std::uint8_t
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#include <cstring> // memcpy
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#include <type_traits> // trivially copyable
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// one can format to either a string, or a buf. buf is faster,
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// but one may be interested in formatting to a string instead to
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// verify it works as intended. to avoid a combinatoric explosion,
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// select this at compile time 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,
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// chances that address sanitizer detects out of bound reads is
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// much higher. However, it slows down the fuzzing.
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#define FMT_FUZZ_SEPARATE_ALLOCATION 1
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// To let the the fuzzer mutation be efficient at cross pollinating
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// between different types, use a fixed size format.
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// The same bit pattern, interpreted as another type,
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// is likely interesting.
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// For this, we must know the size of the largest possible type in use.
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// There are some problems on travis, claiming Nfixed is not a constant
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// expression which seems to be an issue with older versions of libstdc++
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#if _GLIBCXX_RELEASE >= 7
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# include <algorithm>
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namespace fmt_fuzzer {
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constexpr auto Nfixed = std::max(sizeof(long double), sizeof(std::intmax_t));
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}
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#else
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namespace fmt_fuzzer {
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constexpr auto Nfixed = 16;
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}
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#endif
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namespace fmt_fuzzer {
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// view data as a c char pointer.
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template <typename T> inline const char* as_chars(const T* data) {
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return static_cast<const char*>(static_cast<const void*>(data));
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}
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// view data as 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 static_cast<const std::uint8_t*>(static_cast<const void*>(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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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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