/*
# hexify.c: change a binary string to ASCII hex characters.
#
# Copyright (C) 1992, 2011 Free Software Foundation, Inc.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
*/



#include "config.h"

#include "hexify.h"


/* Convert the number N (assumed to be small enough) to a lowercase hex
   character.  */
#define HEX_DIGIT(n) ((n) < 10 ? (n) + '0' : (n) - 10 + 'a')

string
hexify (one_byte *data, unsigned length)
{
  unsigned i;
  /* Each byte in S turns into two hex chars, plus the terminating null.  */
  string h = xmalloc (length * 2 + 1);
  
  for (i = 0; i < length; i++)
    {
      unsigned char n = (data[i] & 0xf0) >> 4;
      h[i * 2] = HEX_DIGIT (n);

      n = data[i] & 0x0f;
      h[i * 2 + 1] = HEX_DIGIT (n);
    }
  h[i * 2] = 0;
  
  return h;
}