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/*
This file is part of GNUnet.
(C) 2012 Christian Grothoff (and other contributing authors)
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
by the Free Software Foundation; either version 3, or (at your
option) any later version.
GNUnet is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
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.
*/
/**
* @author Bartlomiej Polot
* @file mesh/mesh_block_lib.c
*/
#ifdef __cplusplus
extern "C"
{
#if 0
/* keep Emacsens' auto-indent happy */
}
#endif
#endif
#include "mesh_block_lib.h"
/**
* Noop iterator over all edges in a block.
*
* @param cls Closure, not used.
* @param token Token that follows to next state.
* @param len Lenght of token.
* @param key Hash of next state.
*
* @return GNUNET_YES, to keep iterating
*/
static int
check_edge (void *cls,
const char *token,
size_t len,
const struct GNUNET_HashCode *key)
{
return GNUNET_YES;
}
/**
* 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.
*
* @return GNUNET_OK in case it's fine, GNUNET_SYSERR otherwise.
*/
int
GNUNET_MESH_regex_block_check (const struct MeshRegexBlock *block,
size_t size)
{
return GNUNET_MESH_regex_block_iterate(block, size, &check_edge, NULL);
}
/**
* Iterate over all edges of a block of a regex state.
*
* @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 How many bytes of block have been processed
*/
int
GNUNET_MESH_regex_block_iterate (const struct MeshRegexBlock *block,
size_t size,
GNUNET_MESH_EgdeIterator iterator,
void *iter_cls)
{
struct MeshRegexEdge *edge;
unsigned int n;
unsigned int n_token;
unsigned int i;
size_t offset;
char *aux;
offset = sizeof (struct MeshRegexBlock);
if (offset > size) // Is it safe to access the regex block?
return GNUNET_SYSERR;
n = ntohl (block->n_proof);
offset =+ n;
if (offset > size) // Is it safe to access the regex proof?
return GNUNET_SYSERR;
aux = (char *) &block[1]; // Skip regex block
aux = &aux[n]; // Skip regex proof
n = ntohl (block->n_edges);
for (i = 0; i < n; n++) // aux always points at the end of the previous block
{
offset += sizeof (struct MeshRegexEdge);
if (offset > size) // Is it safe to access the next edge block?
return GNUNET_SYSERR;
edge = (struct MeshRegexEdge *) aux;
n_token = ntohl (edge->n_token);
offset += n_token;
if (offset > size) // Is it safe to access the edge token?
return GNUNET_SYSERR;
aux = (char *) &edge[1]; // Skip edge block
if (NULL != iterator)
if (GNUNET_NO == iterator (iter_cls, aux, n_token, &edge->key))
return GNUNET_OK;
aux = &aux[n_token]; // Skip edge token
}
// The total size should be exactly the size of (regex + all edges) blocks
return (offset == size) ? GNUNET_OK : GNUNET_SYSERR;
}
#if 0 /* keep Emacsens' auto-indent happy */
{
#endif
#ifdef __cplusplus
}
#endif
/* end of mesh_block_lib.c */
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