util.hh

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#ifndef SPONGE_LIBSPONGE_UTIL_HH
#define SPONGE_LIBSPONGE_UTIL_HH
 
#include <algorithm>
#include <cerrno>
#include <cstddef>
#include <cstdint>
#include <iterator>
#include <ostream>
#include <random>
#include <string>
#include <system_error>
#include <vector>
 
class tagged_error : public std::system_error {
  private:
    std::string _attempt_and_error;  
 
  public:
    tagged_error(const std::error_category &category, const std::string &attempt, const int error_code)
        : system_error(error_code, category), _attempt_and_error(attempt + ": " + std::system_error::what()) {}
 
    const char *what() const noexcept override { return _attempt_and_error.c_str(); }
};
 
class unix_error : public tagged_error {
  public:
    explicit unix_error(const std::string &attempt, const int error = errno)
        : tagged_error(std::system_category(), attempt, error) {}
};
 
int SystemCall(const char *attempt, const int return_value, const int errno_mask = 0);
 
int SystemCall(const std::string &attempt, const int return_value, const int errno_mask = 0);
 
std::mt19937 get_random_generator();
 
uint64_t timestamp_ms();
 
class InternetChecksum {
  private:
    uint32_t _sum;
    bool _parity{};
 
  public:
    InternetChecksum(const uint32_t initial_sum = 0);
    void add(std::string_view data);
    uint16_t value() const;
};
 
void hexdump(const char *data, const size_t len, const size_t indent = 0);
 
void hexdump(const uint8_t *data, const size_t len, const size_t indent = 0);
 
#endif  // SPONGE_LIBSPONGE_UTIL_HH