c-ipfs/datastore/ds_helper.c

/**
 * Some code to help with the datastore / blockstore interface
 * NOTE: the datastore stores things under a multihash key
 */
#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;
}