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