c-ipfs/datastore/ds_helper.c

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/**
* Some code to help with the datastore / blockstore interface
* NOTE: the datastore stores things under a multihash key
*/
#include <stdlib.h>
#include "libp2p/crypto/encoding/base32.h"
#include "ipfs/datastore/ds_helper.h"
/**
* Generate a base32 key based on the passed in binary_array (which is normally a multihash)
* @param binary_array what to base the key on
* @param array_length the size of the binary array
* @param results where the key will be put
* @param max_results_length the size of the results buffer
* @param results_length the length of the generated key
* @returns true(1) on success
*/
int ipfs_datastore_helper_ds_key_from_binary(const unsigned char* binary_array, size_t array_length,
unsigned char* results, size_t max_results_length, size_t* results_length) {
size_t encoded_length = libp2p_crypto_encoding_base32_encode_size(array_length);
if (encoded_length > max_results_length)
return 0;
*results_length = max_results_length;
int retVal = libp2p_crypto_encoding_base32_encode(binary_array, array_length, results, results_length);
if (retVal == 0) {
*results_length = 0;
return 0;
}
return 1;
}
/**
* Generate a binary array (normally a multihash) based on the passed in datastore key
* @param ds_key the base32 encoded key
* @param key_length the length of the base32 "string"
* @param binary_array where to put the decoded value
* @param max_binary_array_length the memory size of binary_array
* @param completed_binary_array_length the length of what was written to the binary_array
* @returns true(1) on success
*/
int ipfs_datastore_helper_binary_from_ds_key(const unsigned char* ds_key, size_t key_length, unsigned char* binary_array,
size_t max_binary_array_length, size_t* completed_binary_array_length) {
size_t decoded_length = libp2p_crypto_encoding_base32_decode_size(key_length);
if (decoded_length > max_binary_array_length)
return 0;
*completed_binary_array_length = max_binary_array_length;
int retVal = libp2p_crypto_encoding_base32_decode(ds_key, key_length, binary_array, completed_binary_array_length);
if (retVal == 0) {
*completed_binary_array_length = 0;
return 0;
}
return 1;
}
/***
* Add a record in the datastore based on a block
* @param block the block
* @param datastore the Datastore
* @reutrns true(1) on success, false(0) otherwise
*/
int ipfs_datastore_helper_add_block_to_datastore(struct Block* block, struct Datastore* datastore) {
struct DatastoreRecord* rec = libp2p_datastore_record_new();
if (rec == NULL)
return 0;
rec->key_size = block->cid->hash_length;
rec->key = (uint8_t*) malloc(rec->key_size);
if (rec->key == NULL) {
libp2p_datastore_record_free(rec);
return 0;
}
memcpy(rec->key, block->cid->hash, rec->key_size);
rec->timestamp = 0;
// convert the key to base32, and store it in the DatabaseRecord->value section
size_t fs_key_length = 100;
uint8_t fs_key[fs_key_length];
if (!ipfs_datastore_helper_ds_key_from_binary(block->cid->hash, block->cid->hash_length, fs_key, fs_key_length, &fs_key_length)) {
libp2p_datastore_record_free(rec);
return 0;
}
rec->value_size = fs_key_length;
rec->value = malloc(rec->value_size);
if (rec->value == NULL) {
libp2p_datastore_record_free(rec);
return 0;
}
memcpy(rec->value, fs_key, rec->value_size);
int retVal = datastore->datastore_put(rec, datastore);
libp2p_datastore_record_free(rec);
return retVal;
}