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
106 * Possible ways for how a block may relate to a query.
108 enum GNUNET_BLOCK_EvaluationResult
111 * Valid result, and there may be more.
113 GNUNET_BLOCK_EVALUATION_OK_MORE = 0,
116 * Last possible valid result.
118 GNUNET_BLOCK_EVALUATION_OK_LAST = 1,
121 * Valid result, but suppressed because it is a duplicate.
123 GNUNET_BLOCK_EVALUATION_OK_DUPLICATE = 2,
126 * Block does not match query (invalid result)
128 GNUNET_BLOCK_EVALUATION_RESULT_INVALID = 3,
131 * Query is valid, no reply given.
133 GNUNET_BLOCK_EVALUATION_REQUEST_VALID = 4,
136 * Query format does not match block type (invalid query). For
137 * example, xquery not given or xquery_size not appropriate for
140 GNUNET_BLOCK_EVALUATION_REQUEST_INVALID = 5,
143 * Specified block type not supported by this plugin.
145 GNUNET_BLOCK_EVALUATION_TYPE_NOT_SUPPORTED = 6
150 * Handle to an initialized block library.
152 struct GNUNET_BLOCK_Context;
156 * Mingle hash with the mingle_number to produce different bits.
158 * @param in original hash code
159 * @param mingle_number number for hash permutation
160 * @param hc where to store the result.
163 GNUNET_BLOCK_mingle_hash (const GNUNET_HashCode * in, uint32_t mingle_number,
164 GNUNET_HashCode * hc);
168 * Create a block context. Loads the block plugins.
170 * @param cfg configuration to use
171 * @return NULL on error
173 struct GNUNET_BLOCK_Context *
174 GNUNET_BLOCK_context_create (const struct GNUNET_CONFIGURATION_Handle *cfg);
178 * Destroy the block context.
180 * @param ctx context to destroy
183 GNUNET_BLOCK_context_destroy (struct GNUNET_BLOCK_Context *ctx);
187 * Function called to validate a reply or a request. For
188 * request evaluation, simply pass "NULL" for the reply_block.
189 * Note that it is assumed that the reply has already been
190 * matched to the key (and signatures checked) as it would
191 * be done with the "get_key" function.
193 * @param ctx block contxt
194 * @param type block type
195 * @param query original query (hash)
196 * @param bf pointer to bloom filter associated with query; possibly updated (!)
197 * @param bf_mutator mutation value for bf
198 * @param xquery extrended query data (can be NULL, depending on type)
199 * @param xquery_size number of bytes in xquery
200 * @param reply_block response to validate
201 * @param reply_block_size number of bytes in reply block
202 * @return characterization of result
204 enum GNUNET_BLOCK_EvaluationResult
205 GNUNET_BLOCK_evaluate (struct GNUNET_BLOCK_Context *ctx,
206 enum GNUNET_BLOCK_Type type,
207 const GNUNET_HashCode * query,
208 struct GNUNET_CONTAINER_BloomFilter **bf,
209 int32_t bf_mutator, const void *xquery,
210 size_t xquery_size, const void *reply_block,
211 size_t reply_block_size);
215 * Function called to obtain the key for a block.
217 * @param ctx block context
218 * @param type block type
219 * @param block block to get the key for
220 * @param block_size number of bytes in block
221 * @param key set to the key (query) for the given block
222 * @return GNUNET_YES on success,
223 * GNUNET_NO if the block is malformed
224 * GNUNET_SYSERR if type not supported
225 * (or if extracting a key from a block of this type does not work)
228 GNUNET_BLOCK_get_key (struct GNUNET_BLOCK_Context *ctx,
229 enum GNUNET_BLOCK_Type type, const void *block,
230 size_t block_size, GNUNET_HashCode * key);
235 * Construct a bloom filter that would filter out the given
238 * @param bf_mutator mutation value to use
239 * @param seen_results results already seen
240 * @param seen_results_count number of entries in 'seen_results'
241 * @return NULL if seen_results_count is 0, otherwise a BF
242 * that would match the given results.
244 struct GNUNET_CONTAINER_BloomFilter *
245 GNUNET_BLOCK_construct_bloomfilter (int32_t bf_mutator,
246 const GNUNET_HashCode * seen_results,
247 unsigned int seen_results_count);
250 #if 0 /* keep Emacsens' auto-indent happy */
258 /* ifndef GNUNET_BLOCK_LIB_H */
260 /* end of gnunet_block_lib.h */