[2096] Interface of the RDataReader

The oposite of the isc::datasrc::memory::RDataEncoder.

Only the methods are drafted, no documentation yet and no member
variables listed.

src/lib/datasrc/memory/Makefile.am

@@ -13,4 +13,5 @@ noinst_LTLIBRARIES = libdatasrc_memory.la
 libdatasrc_memory_la_SOURCES = \
 	rdata_encoder.h \
 	rdata_encoder.cc \
+	rdata_reader.h rdata_reader.cc \
 	domaintree.h

src/lib/datasrc/memory/rdata_reader.cc

@@ -0,0 +1,15 @@
+// Copyright (C) 2012  Internet Systems Consortium, Inc. ("ISC")
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
+// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+// AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
+// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
+// OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+// PERFORMANCE OF THIS SOFTWARE.
+
+#include "rdata_reader.h"

src/lib/datasrc/memory/rdata_reader.h

@@ -0,0 +1,73 @@
+// Copyright (C) 2012  Internet Systems Consortium, Inc. ("ISC")
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
+// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+// AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
+// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
+// OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+// PERFORMANCE OF THIS SOFTWARE.
+
+#ifndef DATASRC_MEMORY_RDATA_READER_H
+#define DATASRC_MEMORY_RDATA_READER_H 1
+
+#include <boost/function.hpp>
+
+namespace isc {
+namespace dns{
+class LabelSequence;
+class RRClass;
+class RRType;
+}
+namespace datasrc {
+namespace memory {
+
+class RDataReader {
+public:
+    // The sequence and attributes
+    typedef boost::function<void(const dns::LabelSequence&, unsigned int)>
+        NameAction;
+    typedef boost::function<void(const uint8_t*, size_t)> DataAction;
+
+    // For the default parameters.
+    static void emptyNameAction(const dns::LabelSequence& label,
+                                unsigned int attributes);
+    static void emptyDataAction(const uint8_t* data, size_t size);
+
+    RDataReader(const dns::RRClass& rrclass, const dns::RRType& rrtype,
+                size_t size, const uint8_t* data,
+                const NameAction& name_action = &emptyNameAction,
+                const DataAction& data_action = &emptyDataAction);
+
+    enum Action {
+        NAME,
+        DATA,
+        END
+    };
+
+    class Result {
+    public:
+        Action action() const;
+        const uint8_t* data() const;
+        size_t size() const;
+        const dns::LabelSequence& sequence;
+        operator bool() const {
+            return (action() != END);
+        }
+    };
+
+    Result next();
+    void rewind();
+
+    size_t getSize() const;
+};
+
+}
+}
+}
+
+#endif