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fuzz: extract some common utilities and use modern C++ idioms...

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

Augie Fackler - - Load All Authors

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      #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 */

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				#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 */