/*
    This file is part of Pretty Curved Privacy (pcp1).

    Copyright (C) 2013 T. von Dein.

    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/>.

    You can contact me by mail: <tlinden AT cpan DOT org>.
*/

#include "util.h"

/* lowercase a string */
char *_lc(char *in) {
  size_t len = strlen(in);
  size_t i;
  for(i=0; i<len; ++i)
    in[i] = towlower(in[i]);
  return in;
}

/* find the offset of the beginning of a certain string within binary data */
size_t _findoffset(byte *bin, size_t binlen, char *sigstart, size_t hlen) {
  size_t i;
  size_t offset = 0;
  int m = 0;

  for(i=0; i<binlen-hlen; ++i) {
    if(memcmp(&bin[i], sigstart, hlen) == 0) {
      offset = i;
      m = 1;
      break;
    }
  }

  if(m == 0)
    offset = -1;


  return offset;
}

/* xor 2 likesized buffers */
void _xorbuf(byte *iv, byte *buf, size_t xlen) {
  size_t i;
  for (i = 0; i < xlen; ++i)
   buf[i] = iv[i] ^ buf[i];
}

/* print some binary data to stderr */
void _dump(char *n, byte *d, size_t s) {
  int l = strlen(n) + 9;
  fprintf(stderr, "%s (%04ld): ", n, s);
  size_t i;
  int c;
  for (i=0; i<s; ++i) {
    fprintf(stderr, "%02x", d[i]);
    if(i % 36 == 35 && i > 0) {
      fprintf(stderr, "\n");
      for(c=0; c<l; ++c)
	fprintf(stderr, " ");
    }
  }
  fprintf(stderr, "\n");
}