fuzz: extract some common utilities and use modern C++ idioms
Alex Gaynor suggested we should probably copy the left and right sides
of diffs to new blocks so we can detect over-reads in the diffing
code, and I agree. Once I got into that, I realized we should do
things with C++17 idioms rather than keep using malloc() and
free(). This change is the result. I tried to split it more than this
and failed.
Everything still compiles and works in the oss-fuzz container, so I
think we can count on C++17 being available!
Differential Revision: https://phab.mercurial-scm.org/D3675
#ifndef CONTRIB_FUZZ_FUZZUTIL_H
#define CONTRIB_FUZZ_FUZZUTIL_H
#include <iostream>
#include <memory>
#include <optional>
#include <stdint.h>
/* set DEBUG to 1 for a few debugging prints, or 2 for a lot */
#define DEBUG 0
#define LOG(level) \
if (level <= DEBUG) \
std::cout
struct two_inputs {
std::unique_ptr<char[]> right;
size_t right_size;
std::unique_ptr<char[]> left;
size_t left_size;
};
/* Split a non-zero-length input into two inputs. */
std::optional<two_inputs> SplitInputs(const uint8_t *Data, size_t Size);
#endif /* CONTRIB_FUZZ_FUZZUTIL_H */