c-ipfs/include/ipfs/cid/cid.h

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/***
* A content id
*/
#ifndef __IPFS_CID_CID_H
#define __IPFS_CID_CID_H
#include <stddef.h>
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#include "protobuf.h"
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#define CID_PROTOBUF 0x70
#define CID_CBOR 0x71
#define CID_RAW 0x72
#define CID_JSON 0x73
#define CID_ETHEREUM_BLOCK 0x90
#define CID_ETHEREUM_TX 0x91
#define CID_BITCOIN_BLOCK 0xb0
#define CID_BITCOIN_TX 0xb1
#define CID_ZCASH_BLOCK 0xc0
#define CID_ZCASH_TX 0xc1
struct Cid {
int version;
char codec;
unsigned char* hash; // a multihash
size_t hash_length;
};
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/***
* encode a Cid into a protobuf array of bytes
* @param incoming the incoming Cid struct
* @param buffer the buffer
* @param max_buffer_length the length of the buffer
* @param bytes_written the number of bytes written
*/
int ipfs_cid_protobuf_encode(struct Cid* incoming, unsigned char* buffer, size_t max_buffer_length, size_t* bytes_written);
/***
* decode an array of bytes into a Cid structure
* @param buffer the incming array of bytes
* @param buffer_length the length of the buffer
* @param output the Cid struct NOTE: all allocations are made by this function. Be sure to call free
* @returns true(1) on success
*/
int ipfs_cid_protobuf_decode(unsigned char* buffer, size_t buffer_length, struct Cid** output);
/***
* Returns a safe estimate of the required buffer size to encode the Cid struct
* @param incoming the struct to encode
* @returns the number of approximate bytes
*/
size_t ipfs_cid_protobuf_encode_size(struct Cid* incoming);
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/**
* Create a new CID based on the given hash
* @param version the version
* @param hash the multihash
* @param hash_length the length of the multihash in bytes
* @param codec the codec to be used (NOTE: For version 0, this should be CID_PROTOBUF)
* @param cid where to put the results
* @returns true(1) on success
*/
int ipfs_cid_new(int version, unsigned char* hash, size_t hash_length, const char codec, struct Cid** cid);
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/***
* Free the resources from a Cid
* @param cid the struct
* @returns 1
*/
int ipfs_cid_free(struct Cid* cid);
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/***
* Fill a Cid struct based on a base 58 encoded string
* @param incoming the string
* @param incoming_size the size of the string
* @cid the Cid struct to fill
* @return true(1) on success
*/
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int ipfs_cid_decode_hash_from_base58(const unsigned char* incoming, size_t incoming_length, struct Cid** cid);
/**
* Turn a cid into a base 58 of a multihash of the cid hash
* @param cid the cid to work with
* @param buffer where to put the results
* @param max_buffer_length the maximum space reserved for the results
* @returns true(1) on success
*/
int ipfs_cid_hash_to_base58(struct Cid* cid, unsigned char* buffer, size_t max_buffer_length);
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/***
* Turn a multibase decoded string of bytes into a Cid struct
* @param incoming the multibase decoded array
* @param incoming_size the size of the array
* @param cid the Cid structure to fill
*/
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int ipfs_cid_cast(const unsigned char* incoming, size_t incoming_size, struct Cid* cid);
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#endif