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