/*
This file is part of GNUnet.
- (C) 2012,2013 Christian Grothoff (and other contributing authors)
+ Copyright (C) 2012,2013 GNUnet e.V.
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
You should have received a copy of the GNU General Public License
along with GNUnet; see the file COPYING. If not, write to the
- Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA.
+ Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ Boston, MA 02110-1301, USA.
*/
/**
#include "platform.h"
#include "block_regex.h"
+
+/**
+ * Representation of a Regex node (and edges) in the DHT.
+ */
+struct RegexBlock;
+
+
+/**
+ * Edge representation.
+ */
+struct REGEX_BLOCK_Edge
+{
+ /**
+ * Label of the edge. FIXME: might want to not consume exactly
+ * multiples of 8 bits, need length!
+ */
+ const char *label;
+
+ /**
+ * Destionation of the edge.
+ */
+ struct GNUNET_HashCode destination;
+};
+
+
+/**
+ * Check if the given 'proof' matches the given 'key'.
+ *
+ * @param proof partial regex of a state
+ * @param proof_len number of bytes in @a proof
+ * @param key hash of a state.
+ * @return #GNUNET_OK if the proof is valid for the given key.
+ */
+int
+REGEX_BLOCK_check_proof (const char *proof,
+ size_t proof_len,
+ const struct GNUNET_HashCode *key);
+
+
/**
* Check if the regex block is well formed, including all edges.
*
* @param block The start of the block.
- * @param size The size of the block.
+ * @param size The size of the @a block.
+ * @param query the query for the @a block
* @param xquery String describing the edge we are looking for.
* Can be NULL in case this is a put block.
- *
- * @return GNUNET_OK in case it's fine.
- * GNUNET_NO in case the xquery exists and is not found (IRRELEVANT).
- * GNUNET_SYSERR if the block is invalid.
+ * @return #GNUNET_OK in case it's fine.
+ * #GNUNET_NO in case the xquery exists and is not found (IRRELEVANT).
+ * #GNUNET_SYSERR if the block is invalid.
*/
int
-REGEX_ITERNAL_block_check (const struct RegexBlock *block,
- size_t size,
- const char *xquery);
+REGEX_BLOCK_check (const struct RegexBlock *block,
+ size_t size,
+ const struct GNUNET_HashCode *query,
+ const char *xquery);
+
+
+/* FIXME: might want to use 'struct REGEX_BLOCK_Edge' here instead of 3 arguments! */
/**
* Iterator over edges in a block.
* @param token Token that follows to next state.
* @param len Length of token.
* @param key Hash of next state.
- *
- * @return GNUNET_YES if should keep iterating, GNUNET_NO otherwise.
+ * @return #GNUNET_YES if should keep iterating, #GNUNET_NO otherwise.
*/
-typedef int (*REGEX_ITERNAL_EgdeIterator)(void *cls,
- const char *token,
- size_t len,
- const struct GNUNET_HashCode *key);
+typedef int
+(*REGEX_INTERNAL_EgdeIterator)(void *cls,
+ const char *token,
+ size_t len,
+ const struct GNUNET_HashCode *key);
/**
* @param block Block to iterate over.
* @param size Size of block.
* @param iterator Function to call on each edge in the block.
- * @param iter_cls Closure for the iterator.
- *
- * @return GNUNET_SYSERR if an error has been encountered.
- * GNUNET_OK if no error has been encountered.
+ * @param iter_cls Closure for the @a iterator.
+ * @return #GNUNET_SYSERR if an error has been encountered.
+ * #GNUNET_OK if no error has been encountered.
* Note that if the iterator stops the iteration by returning
- * GNUNET_NO, the block will no longer be checked for further errors.
- * The return value will be GNUNET_OK meaning that no errors were
+ * #GNUNET_NO, the block will no longer be checked for further errors.
+ * The return value will be #GNUNET_OK meaning that no errors were
* found until the edge last notified to the iterator, but there might
* be errors in further edges.
*/
int
-REGEX_ITERNAL_block_iterate (const struct RegexBlock *block,
- size_t size,
- REGEX_ITERNAL_EgdeIterator iterator,
- void *iter_cls);
+REGEX_BLOCK_iterate (const struct RegexBlock *block,
+ size_t size,
+ REGEX_INTERNAL_EgdeIterator iterator,
+ void *iter_cls);
+
+
+/**
+ * Obtain the key that a particular block is to be stored under.
+ *
+ * @param block block to get the key from
+ * @param block_len number of bytes in @a block
+ * @param key where to store the key
+ * @return #GNUNET_OK on success, #GNUNET_SYSERR if the block is malformed
+ */
+int
+REGEX_BLOCK_get_key (const struct RegexBlock *block,
+ size_t block_len,
+ struct GNUNET_HashCode *key);
+
+
+/**
+ * Test if this block is marked as being an accept state.
+ *
+ * @param block block to test
+ * @param size number of bytes in block
+ * @return #GNUNET_YES if the block is accepting, #GNUNET_NO if not
+ */
+int
+GNUNET_BLOCK_is_accepting (const struct RegexBlock *block,
+ size_t block_len);
+
+
+/**
+ * Construct a regex block to be stored in the DHT.
+ *
+ * @param proof proof string for the block
+ * @param num_edges number of edges in the block
+ * @param edges the edges of the block
+ * @param accepting is this an accepting state
+ * @param rsize set to the size of the returned block (OUT-only)
+ * @return the regex block, NULL on error
+ */
+struct RegexBlock *
+REGEX_BLOCK_create (const char *proof,
+ unsigned int num_edges,
+ const struct REGEX_BLOCK_Edge *edges,
+ int accepting,
+ size_t *rsize);
+
#if 0 /* keep Emacsens' auto-indent happy */
{
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