--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/servlib/bundling/MetadataBlockProcessor.h	Thu Apr 21 14:57:45 2011 +0100
@@ -0,0 +1,101 @@
+/*
+ *    Copyright 2006-2007 The MITRE Corporation
+ * 
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ * 
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ *
+ *    The US Government will not be charged any license fee and/or royalties
+ *    related to this software. Neither name of The MITRE Corporation; nor the
+ *    names of its contributors may be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ */
+
+#ifndef _METADATA_BLOCK_PROCESSOR_H_
+#define _METADATA_BLOCK_PROCESSOR_H_
+
+#include "BlockProcessor.h"
+
+namespace dtn {
+
+class MetadataBlock;
+
+/**
+ * Block processor implementation for the metadata extension block.
+ */
+class MetadataBlockProcessor : public BlockProcessor {
+public:
+
+    /// Constructor
+    MetadataBlockProcessor();
+
+    /// @{ Virtual from BlockProcessor
+    int  consume(Bundle*    bundle,
+                 BlockInfo* block,
+                 u_char*    buf,
+                 size_t     len);
+
+    bool validate(const Bundle*           bundle,
+                  BlockInfoVec*           block_list,
+                  BlockInfo*              block,
+                  status_report_reason_t* reception_reason,
+                  status_report_reason_t* deletion_reason);
+
+    int prepare(const Bundle*     bundle,
+                 BlockInfoVec*    xmit_blocks,
+                 const BlockInfo* source,
+                 const LinkRef&   link,
+                 list_owner_t     list);
+
+    int generate(const Bundle*  bundle,
+                  BlockInfoVec*  xmit_blocks,
+                  BlockInfo*     block,
+                  const LinkRef& link,
+                  bool           last);
+    /// @}
+
+    /**
+     * Determines the generated metadata (not received metadata, which is
+     * handled by the prepare() method) to be included in an outgoing bundle.
+     */
+    void prepare_generated_metadata(Bundle*        bundle,
+                                    BlockInfoVec*  blocks,
+                                    const LinkRef& link);
+
+    /**
+     * Deletes bundle state maintained for generated metadata.
+     */
+    void delete_generated_metadata(Bundle* bundle, const LinkRef& link);
+
+private:
+
+    /**
+     * Parses a metadata extension block.
+     *
+     * @returns true if metadata parsed successfully, otherwise false.
+     */
+    bool parse_metadata(Bundle* bundle, BlockInfo* block);
+
+    /**
+     * Handles a metadata extension block processing error based on the
+     * block preamble flags.
+     *
+     * @return true if the bundle in which the invalid block was received
+     * should be deleted; otherwise false.
+     */
+    bool handle_error(const BlockInfo*        block,
+                      status_report_reason_t* reception_reason,
+                      status_report_reason_t* deletion_reason);
+};
+
+} // namespace dtn
+
+#endif /* _METADATA_BLOCK_PROCESSOR_H_ */