added a generic _dump() function and put functions into its own C file...

libpcp/util.c

@@ -0,0 +1,68 @@
+/*
+    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(unsigned char *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(unsigned char *iv, unsigned char *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, unsigned char *d, size_t s) {
+  fprintf(stderr, "%s (%ld): ", n, s);
+  size_t i;
+  for (i=0; i<s; ++i)
+    fprintf(stderr, "%02x", d[i]);
+  fprintf(stderr, "\n");
+}