/*
 * Copyright (c) 2015, NORDUnet A/S.
 * See LICENSE for licensing information.
 */

#ifndef PERMDB_H
#define PERMDB_H

#define ENTRIESPERNODE 4        /* q = 2 */

typedef uint64_t node_entry;
typedef uint64_t node_offset;

typedef struct node_object {
        node_entry data[ENTRIESPERNODE];
} node_object;

#define NODE_ENTRY_DIRTY_NODE 0x7FFFFFFFFFFFFFFFULL
#define NODE_ENTRY_ISDATA 0x8000000000000000ULL
#define NODE_ENTRY_OFFSET_MASK 0x7FFFFFFFFFFFFFFFULL
#define NODE_ENTRY_ERROR_NODE 0xFFFFFFFFFFFFFFFFULL

struct permdb_object;

typedef struct permdb_object permdb_object;

node_entry
get_entry_in_node(node_object node, unsigned char n);

unsigned char *
read_internal_data(permdb_object *state, node_offset offset, size_t length);

node_offset
datasize(permdb_object *state);

int
addvalue(permdb_object *state, const unsigned char *key, unsigned int keylength, const unsigned char *data, size_t datalength, node_offset dataoffset);

unsigned char *
getvalue(permdb_object *state, const unsigned char *key, size_t keylength, size_t *datalen);

void
delete_all_nodes_in_cache(permdb_object *state);

void
portloop(permdb_object *state);

permdb_object *
permdb_alloc(const char *dbpath);

void
permdb_free(permdb_object *state);

int
committree(permdb_object *state);

#endif