1 files changed, 95 insertions, 0 deletions
diff --git a/src/lib/dns/rcode.cc b/src/lib/dns/rcode.cc
new file mode 100644
index 0000000..34d93ce
--- /dev/null
+++ b/src/lib/dns/rcode.cc
@@ -0,0 +1,95 @@
+// Copyright (C) 2010-2015 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <string>
+#include <sstream>
+#include <ostream>
+
+#include <exceptions/exceptions.h>
+
+#include <dns/rcode.h>
+
+using namespace std;
+
+namespace isc {
+namespace dns {
+namespace {
+// This diagram shows the wire-format representation of the 12-bit extended
+// form RCODEs and its relationship with implementation specific parameters.
+//
+//     0     3               11      15
+//    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//    |UNUSED | EXTENDED-RCODE | RCODE |
+//    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//                            <= EXTRCODE_SHIFT (4 bits)
+const unsigned int EXTRCODE_SHIFT = 4;
+const unsigned int RCODE_MASK = 0x000f;
+
+
+// EDNS-extended RCODEs are 12-bit unsigned integers.  0xfff is the highest.
+const uint16_t MAX_RCODE = 0xfff;
+
+const char* const rcodetext[] = {
+    "NOERROR",
+    "FORMERR",
+    "SERVFAIL",
+    "NXDOMAIN",
+    "NOTIMP",
+    "REFUSED",
+    "YXDOMAIN",
+    "YXRRSET",
+    "NXRRSET",
+    "NOTAUTH",
+    "NOTZONE",
+    "RESERVED11",
+    "RESERVED12",
+    "RESERVED13",
+    "RESERVED14",
+    "RESERVED15",
+    "BADVERS"
+};
+}
+
+Rcode::Rcode(const uint16_t code) : code_(code) {
+    if (code_ > MAX_RCODE) {
+        isc_throw(OutOfRange, "Rcode is too large to construct");
+    }
+}
+
+Rcode::Rcode(const uint8_t code, const uint8_t extended_code) :
+    code_((extended_code << EXTRCODE_SHIFT) | (code & RCODE_MASK))
+{
+    if (code > RCODE_MASK) {
+        isc_throw(OutOfRange,
+                  "Base Rcode is too large to construct: "
+                  << static_cast<unsigned int>(code));
+    }
+}
+
+uint8_t
+Rcode::getExtendedCode() const {
+    return (code_ >> EXTRCODE_SHIFT);
+}
+
+string
+Rcode::toText() const {
+    if (code_ < sizeof(rcodetext) / sizeof (const char*)) {
+        return (rcodetext[code_]);
+    }
+
+    ostringstream oss;
+    oss << code_;
+    return (oss.str());
+}
+
+ostream&
+operator<<(std::ostream& os, const Rcode& rcode) {
+    return (os << rcode.toText());
+}
+}
+}