69 lines
1.3 KiB
C
69 lines
1.3 KiB
C
#ifndef LSM
|
|
#define LSM
|
|
|
|
#include <stdint.h>
|
|
|
|
#define LSM_MAX_SKIP_SIZE 8
|
|
|
|
typedef enum lsm_error {
|
|
lsm_error_ok = 0,
|
|
lsm_error_failed_alloc = 1,
|
|
lsm_error_not_found = 2,
|
|
lsm_error_already_present = 3
|
|
} lsm_error;
|
|
|
|
/**
|
|
* Represents a string (or really any kind of data) with a known length. Data
|
|
* with length 8 or less is stored inside the pointer, and does not allocate
|
|
* additional memory.
|
|
*/
|
|
typedef struct lsm_string {
|
|
uint64_t len;
|
|
union {
|
|
void *ptr;
|
|
char val[8];
|
|
} str;
|
|
} lsm_string;
|
|
|
|
/**
|
|
* The type of an attribute. Each type is represented as a single bit of a
|
|
* 32-bit integer, so they can be easily combined into a bitmap.
|
|
*/
|
|
typedef enum lsm_attr_type {
|
|
lsm_attr_type_entry_type = 1 << 0
|
|
} lsm_attr_type;
|
|
|
|
/**
|
|
* A single attribute associated with an entry
|
|
*/
|
|
typedef struct lsm_attr {
|
|
lsm_attr_type type;
|
|
lsm_string str;
|
|
} lsm_attr;
|
|
|
|
/**
|
|
* Represents a collection of attributes for an entry. A collection can only
|
|
* contain one of each attribute.
|
|
*/
|
|
typedef struct lsm_attr_list {
|
|
uint64_t count;
|
|
lsm_attr *items;
|
|
uint32_t bitmap;
|
|
} lsm_attr_list;
|
|
|
|
/**
|
|
* An entry inside an LSM store
|
|
*/
|
|
typedef struct lsm_entry {
|
|
lsm_string key;
|
|
lsm_attr_list attrs;
|
|
lsm_string data;
|
|
} lsm_entry;
|
|
|
|
/**
|
|
* A store of entries, which manages its data both in-memory and on disk.
|
|
*/
|
|
typedef struct lsm_store lsm_store;
|
|
|
|
#endif
|