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48 lines
1.7 KiB
C
48 lines
1.7 KiB
C
#ifndef __SYNC_H
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#define __SYNC_H
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#include "str.h" // for alloca_tohex()
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/*
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Synchronize two sets of keys, which are likely to contain many common values
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*/
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#define KEY_LEN 8
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#define PREFIX_STEP_BITS 1
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#define SYNC_MAX_RETRIES 1
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typedef struct {
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uint8_t key[KEY_LEN];
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}sync_key_t;
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#define alloca_sync_key(K) alloca_tohex((K)->key, KEY_LEN)
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struct sync_state;
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typedef void (*peer_has) (void *context, void *peer_context, const sync_key_t *key);
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typedef void (*peer_does_not_have) (void *context, void *peer_context, void *key_context, const sync_key_t *key);
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typedef void (*peer_now_has) (void *context, void *peer_context, void *key_context, const sync_key_t *key);
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struct sync_state* sync_alloc_state(void *context, peer_has has, peer_does_not_have has_not, peer_now_has now_has);
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void sync_free_state(struct sync_state *state);
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// throw away all state related to peer
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void sync_free_peer_state(struct sync_state *state, void *peer_context);
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// tell the sync process that we now have key, with callback context
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// if the key is already present, the context will be updated
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void sync_add_key(struct sync_state *state, const sync_key_t *key, void *key_context);
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int sync_key_exists(const struct sync_state *state, const sync_key_t *key);
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int sync_has_transmit_queued(const struct sync_state *state);
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// ask for a message to be inserted into buff, returns packet length
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size_t sync_build_message(struct sync_state *state, uint8_t *buff, size_t len);
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// process a message received from a peer.
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int sync_recv_message(struct sync_state *state, void *peer_context, const uint8_t *buff, size_t len);
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void sync_enum_differences(struct sync_state *state,
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void (*callback)(void *context, void *peer_context, const sync_key_t *key, uint8_t theirs));
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#endif
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