hex.h

/* Copyright (c) 2015 Ryan Castellucci, All Rights Reserved */
#ifndef __BRAINFLAYER_HEX_H_
#define __BRAINFLAYER_HEX_H_

static const unsigned char unhex_tab[80] = {
  0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0xaa, 0xbb, 0xcc, 0xdd, 0xee,
  0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};

static inline unsigned char *
unhex(unsigned char *str, size_t str_sz,
        unsigned char *unhexed, size_t unhexed_sz) {
  int i, j;
  for (i = j = 0; i < str_sz && j < unhexed_sz; i += 2, ++j) {
    unhexed[j] = (unhex_tab[str[i+0]&0x4f] & 0xf0)|
                 (unhex_tab[str[i+1]&0x4f] & 0x0f);
  }
  return unhexed;
}

unsigned char * hex(unsigned char *, size_t, unsigned char *, size_t);

#endif /* __BRAINFLAYER_HEX_H_ */
/*  vim: set ts=2 sw=2 et ai si: */