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 * Noop iterator over all edges in a block.
40 * @param cls Closure, not used.
41 * @param token Token that follows to next state.
42 * @param len Lenght of token.
43 * @param key Hash of next state.
45 * @return GNUNET_YES, to keep iterating
48 check_edge (void *cls,
51 const struct GNUNET_HashCode *key)
58 * Check if the regex block is well formed, including all edges
60 * @param block The start of the block.
61 * @param size The size of the block.
63 * @return GNUNET_OK in case it's fine, GNUNET_SYSERR otherwise.
66 GNUNET_MESH_regex_block_check (const struct MeshRegexBlock *block,
69 return GNUNET_MESH_regex_block_iterate(block, size, &check_edge, NULL);
74 * Iterate over all edges of a block of a regex state.
76 * @param block Block to iterate over.
77 * @param size Size of block.
78 * @param iterator Function to call on each edge in the block.
79 * @param iter_cls Closure for the iterator.
81 * @return How many bytes of block have been processed
84 GNUNET_MESH_regex_block_iterate (const struct MeshRegexBlock *block,
86 GNUNET_MESH_EgdeIterator iterator,
89 struct MeshRegexEdge *edge;
96 offset = sizeof (struct MeshRegexBlock);
97 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
98 "* Start iterating block of size %u, off %u\n",
100 if (offset > size) // Is it safe to access the regex block?
102 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
103 "* Block is smaller than struct MeshRegexBlock, END\n");
104 return GNUNET_SYSERR;
106 n = ntohl (block->n_proof);
108 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
109 "* Proof length: %u, off %u\n", n, offset);
110 if (offset > size) // Is it safe to access the regex proof?
112 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
113 "* Block is smaller than Block + proof, END\n");
114 return GNUNET_SYSERR;
116 aux = (char *) &block[1]; // Skip regex block
117 aux = &aux[n]; // Skip regex proof
118 n = ntohl (block->n_edges);
119 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* Edges: %u\n", n);
120 for (i = 0; i < n; i++) // aux always points at the end of the previous block
122 offset += sizeof (struct MeshRegexEdge);
123 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* Edge %u, off %u\n", i, offset);
124 if (offset > size) // Is it safe to access the next edge block?
126 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
127 "* Size not enough for MeshRegexEdge, END\n");
128 return GNUNET_SYSERR;
130 edge = (struct MeshRegexEdge *) aux;
131 n_token = ntohl (edge->n_token);
133 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
134 "* Token lenght %u, off %u\n", n_token, offset);
135 if (offset > size) // Is it safe to access the edge token?
137 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
138 "* Size not enough for edge token, END\n");
139 return GNUNET_SYSERR;
141 aux = (char *) &edge[1]; // Skip edge block
142 if (NULL != iterator)
143 if (GNUNET_NO == iterator (iter_cls, aux, n_token, &edge->key))
145 aux = &aux[n_token]; // Skip edge token
147 // The total size should be exactly the size of (regex + all edges) blocks
150 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
151 "* Block processed, END OK\n");
154 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
155 "* Size %u, read %u END KO\n", size, offset);
156 return GNUNET_SYSERR;
159 #if 0 /* keep Emacsens' auto-indent happy */
166 /* end of mesh_block_lib.c */