2 This file is part of GNUnet.
3 (C) 2010 Christian Grothoff (and other contributing authors)
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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
111 * Possible ways for how a block may relate to a query.
113 enum GNUNET_BLOCK_EvaluationResult
116 * Valid result, and there may be more.
118 GNUNET_BLOCK_EVALUATION_OK_MORE = 0,
121 * Last possible valid result.
123 GNUNET_BLOCK_EVALUATION_OK_LAST = 1,
126 * Valid result, but suppressed because it is a duplicate.
128 GNUNET_BLOCK_EVALUATION_OK_DUPLICATE = 2,
131 * Block does not match query (invalid result)
133 GNUNET_BLOCK_EVALUATION_RESULT_INVALID = 3,
136 * Query is valid, no reply given.
138 GNUNET_BLOCK_EVALUATION_REQUEST_VALID = 4,
141 * Query format does not match block type (invalid query). For
142 * example, xquery not given or xquery_size not appropriate for
145 GNUNET_BLOCK_EVALUATION_REQUEST_INVALID = 5,
148 * Specified block type not supported by this plugin.
150 GNUNET_BLOCK_EVALUATION_TYPE_NOT_SUPPORTED = 6
155 * Handle to an initialized block library.
157 struct GNUNET_BLOCK_Context;
161 * Mingle hash with the mingle_number to produce different bits.
163 * @param in original hash code
164 * @param mingle_number number for hash permutation
165 * @param hc where to store the result.
168 GNUNET_BLOCK_mingle_hash (const struct GNUNET_HashCode * in, uint32_t mingle_number,
169 struct GNUNET_HashCode * hc);
173 * Create a block context. Loads the block plugins.
175 * @param cfg configuration to use
176 * @return NULL on error
178 struct GNUNET_BLOCK_Context *
179 GNUNET_BLOCK_context_create (const struct GNUNET_CONFIGURATION_Handle *cfg);
183 * Destroy the block context.
185 * @param ctx context to destroy
188 GNUNET_BLOCK_context_destroy (struct GNUNET_BLOCK_Context *ctx);
192 * Function called to validate a reply or a request. For
193 * request evaluation, simply pass "NULL" for the reply_block.
194 * Note that it is assumed that the reply has already been
195 * matched to the key (and signatures checked) as it would
196 * be done with the "get_key" function.
198 * @param ctx block contxt
199 * @param type block type
200 * @param query original query (hash)
201 * @param bf pointer to bloom filter associated with query; possibly updated (!)
202 * @param bf_mutator mutation value for bf
203 * @param xquery extrended query data (can be NULL, depending on type)
204 * @param xquery_size number of bytes in xquery
205 * @param reply_block response to validate
206 * @param reply_block_size number of bytes in reply block
207 * @return characterization of result
209 enum GNUNET_BLOCK_EvaluationResult
210 GNUNET_BLOCK_evaluate (struct GNUNET_BLOCK_Context *ctx,
211 enum GNUNET_BLOCK_Type type,
212 const struct GNUNET_HashCode * query,
213 struct GNUNET_CONTAINER_BloomFilter **bf,
214 int32_t bf_mutator, const void *xquery,
215 size_t xquery_size, const void *reply_block,
216 size_t reply_block_size);
220 * Function called to obtain the key for a block.
222 * @param ctx block context
223 * @param type block type
224 * @param block block to get the key for
225 * @param block_size number of bytes in block
226 * @param key set to the key (query) for the given block
227 * @return GNUNET_YES on success,
228 * GNUNET_NO if the block is malformed
229 * GNUNET_SYSERR if type not supported
230 * (or if extracting a key from a block of this type does not work)
233 GNUNET_BLOCK_get_key (struct GNUNET_BLOCK_Context *ctx,
234 enum GNUNET_BLOCK_Type type, const void *block,
235 size_t block_size, struct GNUNET_HashCode * key);
240 * Construct a bloom filter that would filter out the given
243 * @param bf_mutator mutation value to use
244 * @param seen_results results already seen
245 * @param seen_results_count number of entries in 'seen_results'
246 * @return NULL if seen_results_count is 0, otherwise a BF
247 * that would match the given results.
249 struct GNUNET_CONTAINER_BloomFilter *
250 GNUNET_BLOCK_construct_bloomfilter (int32_t bf_mutator,
251 const struct GNUNET_HashCode * seen_results,
252 unsigned int seen_results_count);
255 #if 0 /* keep Emacsens' auto-indent happy */
263 /* ifndef GNUNET_BLOCK_LIB_H */
265 /* end of gnunet_block_lib.h */