moving library related files to new folders

In preparation for changing the make buildsystem to a fully autotools
controlled system moving the core libcoap source files to a better logical
place.

All the library related header files moving to include/coap/ to get
all the public and local header files in a separate place. Also moving
the C source files of the libcoap library to the folder src/.

src/encode.c

@@ -0,0 +1,48 @@
+/* encode.c -- encoding and decoding of CoAP data types
+ *
+ * Copyright (C) 2010,2011 Olaf Bergmann <bergmann@tzi.org>
+ *
+ * This file is part of the CoAP library libcoap. Please see
+ * README for terms of use. 
+ */
+
+#ifndef NDEBUG
+#  include <stdio.h>
+#endif
+
+#include "coap_config.h"
+#include "encode.h"
+
+/* Carsten suggested this when fls() is not available: */
+int coap_fls(unsigned int i) {
+  int n;
+  for (n = 0; i; n++)
+    i >>= 1;
+  return n;
+}
+
+unsigned int
+coap_decode_var_bytes(unsigned char *buf,unsigned int len) {
+  unsigned int i, n = 0;
+  for (i = 0; i < len; ++i)
+    n = (n << 8) + buf[i];
+
+  return n;
+}
+
+unsigned int
+coap_encode_var_bytes(unsigned char *buf, unsigned int val) {
+  unsigned int n, i;
+
+  for (n = 0, i = val; i && n < sizeof(val); ++n)
+    i >>= 8;
+
+  i = n;
+  while (i--) {
+    buf[i] = val & 0xff;
+    val >>= 8;
+  }
+
+  return n;
+}
+