deps/cifra/src/testutil.h

/*
 * cifra - embedded cryptography library
 * Written in 2014 by Joseph Birr-Pixton <jpixton@gmail.com>
 *
 * To the extent possible under law, the author(s) have dedicated all
 * copyright and related and neighboring rights to this software to the
 * public domain worldwide. This software is distributed without any
 * warranty.
 *
 * You should have received a copy of the CC0 Public Domain Dedication
 * along with this software. If not, see
 * <http://creativecommons.org/publicdomain/zero/1.0/>.
 */

#ifndef TESTUTIL_H
#define TESTUTIL_H

#include <assert.h>
#include <string.h>
#include <stdio.h>

static inline uint8_t unhex_chr(char a)
{
  if (a >= '0' && a <= '9')
    return a - '0';
  else if (a >= 'a' && a <= 'f')
    return a - 'a' + 10;
  else if (a >= 'A' && a <= 'F')
    return a - 'A' + 10;
  return 0;
}

static inline size_t unhex(uint8_t *buf, size_t len, const char *str)
{
  size_t used = 0;

  assert(strlen(str) % 2 == 0);
  assert(strlen(str) / 2 <= len);

  while (*str)
  {
    assert(len);
    *buf = unhex_chr(str[0]) << 4 | unhex_chr(str[1]);
    buf++;
    used++;
    str += 2;
    len--;
  }

  return used;
}

static inline void dump(const char *label, const uint8_t *buf, size_t len)
{
  printf("%s: ", label);
  for (size_t i = 0; i < len; i++)
    printf("%02x", buf[i]);
  printf("\n");
}

#endif