2 This file is part of GNUnet.
3 (C) 2010 Christian Grothoff (and other contributing authors)
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6 it under the terms of the GNU General Public License as published
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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_FS_DBLOCK = 1,
56 * Inner block in the CHK tree.
58 GNUNET_BLOCK_TYPE_FS_IBLOCK = 2,
61 * Type of a block representing a keyword search result. Note that
62 * the values for KBLOCK, SBLOCK and NBLOCK must be consecutive.
64 GNUNET_BLOCK_TYPE_FS_KBLOCK = 3,
67 * Type of a block that is used to advertise content in a namespace.
69 GNUNET_BLOCK_TYPE_FS_SBLOCK = 4,
72 * Type of a block that is used to advertise a namespace.
74 GNUNET_BLOCK_TYPE_FS_NBLOCK = 5,
77 * Type of a block representing a block to be encoded on demand from disk.
78 * Should never appear on the network directly.
80 GNUNET_BLOCK_TYPE_FS_ONDEMAND = 6,
83 * Type of a block that contains a HELLO for a peer (for
84 * DHT find-peer operations).
86 GNUNET_BLOCK_TYPE_DHT_HELLO = 7,
91 GNUNET_BLOCK_TYPE_TEST = 8,
94 * Block for storing .gnunet-domains
96 GNUNET_BLOCK_TYPE_DNS = 10,
99 * Block for storing record data
101 GNUNET_BLOCK_TYPE_GNS_NAMERECORD = 11,
104 * Block for storing mesh peers
106 GNUNET_BLOCK_TYPE_MESH_PEER = 20,
109 * Block for finding peers by type
111 GNUNET_BLOCK_TYPE_MESH_PEER_BY_TYPE = 21
116 * Possible ways for how a block may relate to a query.
118 enum GNUNET_BLOCK_EvaluationResult
121 * Valid result, and there may be more.
123 GNUNET_BLOCK_EVALUATION_OK_MORE = 0,
126 * Last possible valid result.
128 GNUNET_BLOCK_EVALUATION_OK_LAST = 1,
131 * Valid result, but suppressed because it is a duplicate.
133 GNUNET_BLOCK_EVALUATION_OK_DUPLICATE = 2,
136 * Block does not match query (invalid result)
138 GNUNET_BLOCK_EVALUATION_RESULT_INVALID = 3,
141 * Query is valid, no reply given.
143 GNUNET_BLOCK_EVALUATION_REQUEST_VALID = 4,
146 * Query format does not match block type (invalid query). For
147 * example, xquery not given or xquery_size not appropriate for
150 GNUNET_BLOCK_EVALUATION_REQUEST_INVALID = 5,
153 * Specified block type not supported by this plugin.
155 GNUNET_BLOCK_EVALUATION_TYPE_NOT_SUPPORTED = 6
160 * Handle to an initialized block library.
162 struct GNUNET_BLOCK_Context;
166 * Mingle hash with the mingle_number to produce different bits.
168 * @param in original hash code
169 * @param mingle_number number for hash permutation
170 * @param hc where to store the result.
173 GNUNET_BLOCK_mingle_hash (const struct GNUNET_HashCode * in, uint32_t mingle_number,
174 struct GNUNET_HashCode * hc);
178 * Create a block context. Loads the block plugins.
180 * @param cfg configuration to use
181 * @return NULL on error
183 struct GNUNET_BLOCK_Context *
184 GNUNET_BLOCK_context_create (const struct GNUNET_CONFIGURATION_Handle *cfg);
188 * Destroy the block context.
190 * @param ctx context to destroy
193 GNUNET_BLOCK_context_destroy (struct GNUNET_BLOCK_Context *ctx);
197 * Function called to validate a reply or a request. For
198 * request evaluation, simply pass "NULL" for the reply_block.
199 * Note that it is assumed that the reply has already been
200 * matched to the key (and signatures checked) as it would
201 * be done with the "get_key" function.
203 * @param ctx block contxt
204 * @param type block type
205 * @param query original query (hash)
206 * @param bf pointer to bloom filter associated with query; possibly updated (!)
207 * @param bf_mutator mutation value for bf
208 * @param xquery extrended query data (can be NULL, depending on type)
209 * @param xquery_size number of bytes in xquery
210 * @param reply_block response to validate
211 * @param reply_block_size number of bytes in reply block
212 * @return characterization of result
214 enum GNUNET_BLOCK_EvaluationResult
215 GNUNET_BLOCK_evaluate (struct GNUNET_BLOCK_Context *ctx,
216 enum GNUNET_BLOCK_Type type,
217 const struct GNUNET_HashCode * query,
218 struct GNUNET_CONTAINER_BloomFilter **bf,
219 int32_t bf_mutator, const void *xquery,
220 size_t xquery_size, const void *reply_block,
221 size_t reply_block_size);
225 * Function called to obtain the key for a block.
227 * @param ctx block context
228 * @param type block type
229 * @param block block to get the key for
230 * @param block_size number of bytes in block
231 * @param key set to the key (query) for the given block
232 * @return GNUNET_YES on success,
233 * GNUNET_NO if the block is malformed
234 * GNUNET_SYSERR if type not supported
235 * (or if extracting a key from a block of this type does not work)
238 GNUNET_BLOCK_get_key (struct GNUNET_BLOCK_Context *ctx,
239 enum GNUNET_BLOCK_Type type, const void *block,
240 size_t block_size, struct GNUNET_HashCode * key);
245 * Construct a bloom filter that would filter out the given
248 * @param bf_mutator mutation value to use
249 * @param seen_results results already seen
250 * @param seen_results_count number of entries in 'seen_results'
251 * @return NULL if seen_results_count is 0, otherwise a BF
252 * that would match the given results.
254 struct GNUNET_CONTAINER_BloomFilter *
255 GNUNET_BLOCK_construct_bloomfilter (int32_t bf_mutator,
256 const struct GNUNET_HashCode * seen_results,
257 unsigned int seen_results_count);
260 #if 0 /* keep Emacsens' auto-indent happy */
268 /* ifndef GNUNET_BLOCK_LIB_H */
270 /* end of gnunet_block_lib.h */