152 lines
4.8 KiB
C
152 lines
4.8 KiB
C
/***
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* A content id
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*/
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#ifndef __IPFS_CID_CID_H
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#define __IPFS_CID_CID_H
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#include <stddef.h>
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#include "protobuf.h"
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// these are multicodec packed content types. They should match
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// the codes described in the authoratative document:
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// https://github.com/multiformats/multicodec/blob/master/table.csv
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#define CID_RAW 0x55
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#define CID_DAG_PROTOBUF 0x70
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#define CID_DAG_CBOR 0x71
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#define CID_GIT_RAW 0x78
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#define CID_ETHEREUM_BLOCK 0x90
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#define CID_ETHEREUM_BLOCKLIST 0x91
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#define CID_ETHEREUM_TRIE 0x92
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#define CID_ETHEREUM_TX 0x93
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#define CID_ETHEREUM_TX_RECEIPT_TRIE 0x94
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#define CID_ETHEREUM_TX_RECEIPT 0x95
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#define CID_ETHEREUM_STATE_TRIE 0x96
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#define CID_ETHEREUM_ACCOUNT_SNAPSHOT 0x97
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#define CID_ETHEREUM_STORAGE_TRIE 0x98
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#define CID_BITCOIN_BLOCK 0xb0
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#define CID_BITCOIN_TX 0xb1
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#define CID_ZCASH_BLOCK 0xc0
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#define CID_ZCASH_TX 0xc1
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/***
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* A note about CID versions:
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* Version 0 only contained the multihash address. The extra parameters of multibase,
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* multicodec, cid-version were implied (base58btc, protobuf-mdag, and cidv0
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* respectively) are implied.
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*/
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struct Cid {
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int version; // CID version
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int codec; // codec used (i.e. CID_RAW, CID_PROTOBUF
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unsigned char* hash; // the multihash
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size_t hash_length; // the length of hash
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};
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struct CidSet {
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struct Cid *cid;
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struct CidSet *next;
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};
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/***
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* encode a Cid into a protobuf array of bytes
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* @param incoming the incoming Cid struct
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* @param buffer the buffer
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* @param max_buffer_length the length of the buffer
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* @param bytes_written the number of bytes written
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*/
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int ipfs_cid_protobuf_encode(const struct Cid* incoming, unsigned char* buffer, size_t max_buffer_length, size_t* bytes_written);
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/***
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* decode an array of bytes into a Cid structure
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* @param buffer the incming array of bytes
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* @param buffer_length the length of the buffer
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* @param output the Cid struct NOTE: all allocations are made by this function. Be sure to call free
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* @returns true(1) on success
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*/
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int ipfs_cid_protobuf_decode(unsigned char* buffer, size_t buffer_length, struct Cid** output);
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/***
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* Returns a safe estimate of the required buffer size to encode the Cid struct
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* @param incoming the struct to encode
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* @returns the number of approximate bytes
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*/
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size_t ipfs_cid_protobuf_encode_size(const struct Cid* incoming);
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/**
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* Create a new CID based on the given hash
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* @param version the version
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* @param hash the multihash
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* @param hash_length the length of the multihash in bytes
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* @param codec the codec to be used (NOTE: For version 0, this should be CID_PROTOBUF)
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* @returns the Cid, or NULL if there was a problem
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*/
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struct Cid* ipfs_cid_new(int version, const unsigned char* hash, size_t hash_length, const char codec);
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/***
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* Free the resources from a Cid
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* @param cid the struct
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* @returns 1
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*/
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int ipfs_cid_free(struct Cid* cid);
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/***
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* Make a copy of a Cid
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* @param original the original
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* @returns a copy of the original
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*/
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struct Cid* ipfs_cid_copy(const struct Cid* original);
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/***
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* Fill a Cid struct based on a base 58 encoded string
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* @param incoming the string
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* @param incoming_size the size of the string
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* @cid the Cid struct to fill
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* @return true(1) on success
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*/
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int ipfs_cid_decode_hash_from_base58(const unsigned char* incoming, size_t incoming_length, struct Cid** cid);
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/**
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* Turn a cid into a base 58 of a multihash of the cid hash
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* @param cid the cid to work with
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* @param buffer where to put the results
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* @param max_buffer_length the maximum space reserved for the results
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* @returns true(1) on success
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*/
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int ipfs_cid_hash_to_base58(const unsigned char* hash, size_t hash_length, unsigned char* buffer, size_t max_buffer_length);
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/***
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* Turn the hash of this CID into a c string
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* @param cid the cid
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* @param result a place to allocate and store the string
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* @returns a pointer to the string (*result) or NULL if there was a problem
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*/
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char* ipfs_cid_to_string(const struct Cid* cid, char **result);
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/***
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* Turn a multibase decoded string of bytes into a Cid struct
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* @param incoming the multibase decoded array
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* @param incoming_size the size of the array
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* @param cid the Cid structure to fill
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*/
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int ipfs_cid_cast(const unsigned char* incoming, size_t incoming_size, struct Cid* cid);
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struct CidSet *ipfs_cid_set_new ();
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void ipfs_cid_set_destroy (struct CidSet **set);
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int ipfs_cid_set_add (struct CidSet *set, struct Cid *cid, int visit);
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int ipfs_cid_set_has (struct CidSet *set, struct Cid *cid);
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int ipfs_cid_set_remove (struct CidSet *set, struct Cid *cid);
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int ipfs_cid_set_len (struct CidSet *set);
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unsigned char **ipfs_cid_set_keys (struct CidSet *set);
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int ipfs_cid_set_foreach (struct CidSet *set, int (*func)(struct Cid *));
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/**
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* Compare two cids
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* @param a side A
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* @param b side B
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* @returns < 0 if side A is greater, > 0 if side B is greater, or 0 if equal
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*/
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int ipfs_cid_compare(const struct Cid* a, const struct Cid* b);
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#endif
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