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,
95 * Block for simulating malicious peers.
97 GNUNET_BLOCK_DHT_MALICIOUS_MESSAGE_TYPE = 9
103 * Possible ways for how a block may relate to a query.
105 enum GNUNET_BLOCK_EvaluationResult
108 * Valid result, and there may be more.
110 GNUNET_BLOCK_EVALUATION_OK_MORE = 0,
113 * Last possible valid result.
115 GNUNET_BLOCK_EVALUATION_OK_LAST = 1,
118 * Valid result, but suppressed because it is a duplicate.
120 GNUNET_BLOCK_EVALUATION_OK_DUPLICATE = 2,
123 * Block does not match query (invalid result)
125 GNUNET_BLOCK_EVALUATION_RESULT_INVALID = 3,
128 * Query is valid, no reply given.
130 GNUNET_BLOCK_EVALUATION_REQUEST_VALID = 4,
133 * Query format does not match block type (invalid query). For
134 * example, xquery not given or xquery_size not appropriate for
137 GNUNET_BLOCK_EVALUATION_REQUEST_INVALID = 5,
140 * Specified block type not supported by this plugin.
142 GNUNET_BLOCK_EVALUATION_TYPE_NOT_SUPPORTED = 6
147 * Handle to an initialized block library.
149 struct GNUNET_BLOCK_Context;
153 * Mingle hash with the mingle_number to produce different bits.
155 * @param in original hash code
156 * @param mingle_number number for hash permutation
157 * @param hc where to store the result.
160 GNUNET_BLOCK_mingle_hash (const GNUNET_HashCode * in,
161 int32_t mingle_number,
162 GNUNET_HashCode * hc);
166 * Create a block context. Loads the block plugins.
168 * @param cfg configuration to use
169 * @return NULL on error
171 struct GNUNET_BLOCK_Context *
172 GNUNET_BLOCK_context_create (const struct GNUNET_CONFIGURATION_Handle *cfg);
176 * Destroy the block context.
178 * @param ctx context to destroy
181 GNUNET_BLOCK_context_destroy (struct GNUNET_BLOCK_Context *ctx);
185 * Function called to validate a reply or a request. For
186 * request evaluation, simply pass "NULL" for the reply_block.
187 * Note that it is assumed that the reply has already been
188 * matched to the key (and signatures checked) as it would
189 * be done with the "get_key" function.
191 * @param ctx block contxt
192 * @param type block type
193 * @param query original query (hash)
194 * @param bf pointer to bloom filter associated with query; possibly updated (!)
195 * @param bf_mutator mutation value for bf
196 * @param xquery extrended query data (can be NULL, depending on type)
197 * @param xquery_size number of bytes in xquery
198 * @param reply_block response to validate
199 * @param reply_block_size number of bytes in reply block
200 * @return characterization of result
202 enum GNUNET_BLOCK_EvaluationResult
203 GNUNET_BLOCK_evaluate (struct GNUNET_BLOCK_Context *ctx,
204 enum GNUNET_BLOCK_Type type,
205 const GNUNET_HashCode *query,
206 struct GNUNET_CONTAINER_BloomFilter **bf,
210 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_OK 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,
232 GNUNET_HashCode *key);
235 #if 0 /* keep Emacsens' auto-indent happy */
243 /* ifndef GNUNET_BLOCK_LIB_H */
245 /* end of gnunet_block_lib.h */