2 This file is part of GNUnet.
3 (C) 2012 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
22 * @author Bartlomiej Polot
23 * @file mesh/mesh_block_lib.c
30 /* keep Emacsens' auto-indent happy */
35 #include "mesh_block_lib.h"
38 * Iterator over edges in a block.
41 * @param token Token that follows to next state.
42 * @param len Lenght of token.
43 * @param key Hash of next state.
46 check_edge (void *cls,
49 const struct GNUNET_HashCode *key)
56 * Check if the regex block is well formed, including all edges
58 * @param block The start of the block.
59 * @param size The size of the block.
61 * @return GNUNET_OK in case it's fine, GNUNET_SYSERR otherwise.
64 GNUNET_MESH_regex_block_check (const struct MeshRegexBlock *block,
67 return GNUNET_MESH_regex_block_iterate(NULL, block, size, &check_edge);
72 * Iterate over all edges of a block of a regex state.
74 * @param cls Closure for the iterator.
75 * @param block Block to iterate over.
76 * @param size Size of block.
77 * @param iterator Function to call on each edge in the block.
79 * @return How many bytes of block have been processed
82 GNUNET_MESH_regex_block_iterate (void *cls,
83 const struct MeshRegexBlock *block,
85 GNUNET_MESH_EgdeIterator iterator)
87 struct MeshRegexEdge *edge;
94 offset = sizeof (struct MeshRegexBlock);
95 if (offset > size) // Is it safe to access the regex block?
97 n = ntohl (block->n_proof);
99 if (offset > size) // Is it safe to access the regex proof?
100 return GNUNET_SYSERR;
101 aux = (char *) &block[1]; // Skip regex block
102 aux = &aux[n]; // Skip regex proof
103 n = ntohl (block->n_edges);
104 for (i = 0; i < n; n++) // aux always points at the end of the previous block
106 offset += sizeof (struct MeshRegexEdge);
107 if (offset > size) // Is it safe to access the next edge block?
108 return GNUNET_SYSERR;
109 edge = (struct MeshRegexEdge *) aux;
110 n_token = ntohl (edge->n_token);
112 if (offset > size) // Is it safe to access the edge token?
113 return GNUNET_SYSERR;
114 aux = (char *) &edge[1]; // Skip edge block
115 if (NULL != iterator)
116 if (GNUNET_NO == iterator (cls, aux, n_token, &edge->key))
118 aux = &aux[n_token]; // Skip edge token
120 // The total size should be exactly the size of (regex + all edges) blocks
121 return (offset == size) ? GNUNET_OK : GNUNET_SYSERR;
124 #if 0 /* keep Emacsens' auto-indent happy */
131 /* end of mesh_block_lib.c */