2 This file is part of GNUnet.
3 (C) 2010 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 * @file include/gnunet_block_lib.h
23 * @brief library for data block manipulation
24 * @author Christian Grothoff
26 #ifndef GNUNET_BLOCK_LIB_H
27 #define GNUNET_BLOCK_LIB_H
29 #include "gnunet_util_lib.h"
33 #if 0 /* keep Emacsens' auto-indent happy */
40 * Blocks in the datastore and the datacache must have a unique type.
42 enum GNUNET_BLOCK_Type
45 * Any type of block, used as a wildcard when searching. Should
46 * never be attached to a specific block.
48 GNUNET_BLOCK_TYPE_ANY = 0,
51 * Data block (leaf) in the CHK tree.
53 GNUNET_BLOCK_TYPE_DBLOCK = 1,
56 * Inner block in the CHK tree.
58 GNUNET_BLOCK_TYPE_IBLOCK = 2,
61 * Type of a block representing a keyword search result.
63 GNUNET_BLOCK_TYPE_KBLOCK = 3,
66 * Type of a block that is used to advertise content in a namespace.
68 GNUNET_BLOCK_TYPE_SBLOCK = 4,
71 * Type of a block representing a block to be encoded on demand from disk.
72 * Should never appear on the network directly.
74 GNUNET_BLOCK_TYPE_ONDEMAND = 5,
77 * Type of a block that is used to advertise a namespace.
79 GNUNET_BLOCK_TYPE_NBLOCK = 6,
81 GNUNET_BLOCK_TYPE_TEST = 9999
89 * Possible ways for how a block may relate to a query.
91 enum GNUNET_BLOCK_EvaluationResult
94 * Valid result, and there may be more.
96 GNUNET_BLOCK_EVALUATION_OK_MORE = 0,
99 * Last possible valid result.
101 GNUNET_BLOCK_EVALUATION_OK_LAST = 1,
104 * Valid result, but suppressed because it is a duplicate.
106 GNUNET_BLOCK_EVALUATION_OK_DUPLICATE = 2,
109 * Block does not match query (invalid result)
111 GNUNET_BLOCK_EVALUATION_RESULT_INVALID = 3,
114 * Query is valid, no reply given.
116 GNUNET_BLOCK_EVALUATION_REQUEST_VALID = 4,
119 * Query format does not match block type (invalid query). For
120 * example, xquery not given or xquery_size not appropriate for
123 GNUNET_BLOCK_EVALUATION_REQUEST_INVALID = 5,
126 * Specified block type not supported by this plugin.
128 GNUNET_BLOCK_EVALUATION_TYPE_NOT_SUPPORTED = 6
133 * Handle to an initialized block library.
135 struct GNUNET_BLOCK_Context;
139 * Create a block context. Loads the block plugins.
141 * @param cfg configuration to use
142 * @return NULL on error
144 struct GNUNET_BLOCK_Context *
145 GNUNET_BLOCK_context_create (const struct GNUNET_CONFIGURATION_Handle *cfg);
149 * Destroy the block context.
151 * @param ctx context to destroy
154 GNUNET_BLOCK_context_destroy (struct GNUNET_BLOCK_Context *ctx);
158 * Function called to validate a reply or a request. For
159 * request evaluation, simply pass "NULL" for the reply_block.
160 * Note that it is assumed that the reply has already been
161 * matched to the key (and signatures checked) as it would
162 * be done with the "get_key" function.
164 * @param ctx block contxt
165 * @param type block type
166 * @param query original query (hash)
167 * @param bf pointer to bloom filter associated with query; possibly updated (!)
168 * @param bf_mutator mutation value for bf
169 * @param xquery extrended query data (can be NULL, depending on type)
170 * @param xquery_size number of bytes in xquery
171 * @param reply_block response to validate
172 * @param reply_block_size number of bytes in reply block
173 * @return characterization of result
175 enum GNUNET_BLOCK_EvaluationResult
176 GNUNET_BLOCK_evaluate (struct GNUNET_BLOCK_Context *ctx,
177 enum GNUNET_BLOCK_Type type,
178 const GNUNET_HashCode *query,
179 struct GNUNET_CONTAINER_BloomFilter **bf,
183 const void *reply_block,
184 size_t reply_block_size);
188 * Function called to obtain the key for a block.
190 * @param ctx block context
191 * @param type block type
192 * @param block block to get the key for
193 * @param block_size number of bytes in block
194 * @param key set to the key (query) for the given block
195 * @return GNUNET_OK on success, GNUNET_SYSERR if type not supported
196 * (or if extracting a key from a block of this type does not work)
199 GNUNET_BLOCK_get_key (struct GNUNET_BLOCK_Context *ctx,
200 enum GNUNET_BLOCK_Type type,
203 GNUNET_HashCode *key);
206 #if 0 /* keep Emacsens' auto-indent happy */
214 /* ifndef GNUNET_BLOCK_LIB_H */
216 /* end of gnunet_block_lib.h */