Increase UIDs to 96 bits w/ C/F prefix - BIT-1016

- The bit-length is adjustable via redef'ing bits_per_uid.

- Prefix 'C' is used for connection UIDS (including IP tunnels) and
  'F' for files.

src/UID.cc

@@ -0,0 +1,43 @@
+#include <cstdlib>
+
+#include "UID.h"
+
+using namespace Bro;
+using namespace std;
+
+void UID::Set(bro_uint_t bits, const std::vector<uint64>& v)
+	{
+	uid.clear();
+
+	div_t res = div(bits, 64);
+	int size = res.rem ? res.quot + 1 : res.quot;
+
+	for ( int i = 0; i < size; ++i )
+		uid.push_back(i < v.size() ? v[i] : calculate_unique_id());
+
+	if ( res.rem )
+		uid[0] >>= 64 - res.rem;
+	}
+
+string UID::Base62(const std::string& prefix) const
+	{
+	char tmp[64]; // technically, this should dynamically scale based on size
+	string rval(prefix);
+
+	for ( size_t i = 0; i < uid.size(); ++i )
+		rval.append(uitoa_n(uid[i], tmp, sizeof(tmp), 62));
+
+	return rval;
+	}
+
+bool Bro::operator==(const UID& u1, const UID& u2)
+	{
+	if ( u1.uid.size() != u2.uid.size() )
+		return false;
+
+	for ( size_t i = 0; i < u1.uid.size(); ++i )
+		if ( u1.uid[i] != u2.uid[i] )
+			return false;
+
+	return true;
+	}