#ifndef _MMAP_CACHE_H_

#define _MMAP_CACHE_H_

#include "util/murmurhash3.h"

typedef uint32_t rel_ptr_t;

#define MC_8 sizeof(uint8_t)

#define MC_32 sizeof(uint32_t)

#define MC_64 sizeof(uint64_t)

#define MC_ALIGN32(size) ( ((size) + MC_32 -1) & (~(MC_32 -1)) )

#define MC_ALIGN64(size) ( ((size) + MC_64 -1) & (~(MC_64 -1)) )

#define MC_HEADER_SIZE MC_ALIGN64(sizeof(struct sss_mc_header))

#define MC_HT_SIZE(elems) ( (elems) * MC_32 )

#define MC_HT_ELEMS(size) ( (size) / MC_32 )

#define MC_DT_SIZE(elems, payload) ( (elems) * (payload) )

#define MC_FT_SIZE(elems) ( (elems) / 8 )

#define MC_PTR_ADD(ptr, bytes) (void *)((uint8_t *)(ptr) + (bytes))

#define MC_PTR_DIFF(ptr, base) ((uint8_t *)(ptr) - (uint8_t *)(base))

#define MC_INVALID_VAL64 ((uint64_t)-1)

#define MC_INVALID_VAL32 ((uint32_t)-1)

#define MC_INVALID_VAL8 ((uint8_t)-1)

#define MC_INVALID_VAL MC_INVALID_VAL32

#define MC_SLOT_SIZE 40

#define MC_SIZE_TO_SLOTS(len) (((len) + (MC_SLOT_SIZE - 1)) / MC_SLOT_SIZE)

#define MC_PTR_TO_SLOT(base, ptr) (MC_PTR_DIFF(ptr, base) / MC_SLOT_SIZE)

#define MC_SLOT_TO_PTR(base, slot, type) \

(type *)((base) + ((slot) * MC_SLOT_SIZE))

#define MC_SLOT_WITHIN_BOUNDS(slot, dt_size) \

((slot) < ((dt_size) / MC_SLOT_SIZE))

#define MC_VALID_BARRIER(val) (((val) & 0xff000000) == 0xf0000000)

#define MC_CHECK_RECORD_LENGTH(mc_ctx, rec) \

((rec)->len >= MC_HEADER_SIZE && (rec)->len != MC_INVALID_VAL32 \

&& ((rec)->len <= ((mc_ctx)->dt_size \

- MC_PTR_DIFF(rec, (mc_ctx)->data_table))))

#define SSS_MC_MAJOR_VNO 1

#define SSS_MC_MINOR_VNO 0

#define SSS_MC_HEADER_UNINIT 0 /* after ftruncate or before reset */

#define SSS_MC_HEADER_ALIVE 1 /* current and in use */

#define SSS_MC_HEADER_RECYCLED 2 /* file was recycled, reopen asap */

#pragma pack(1)

struct sss_mc_header {

uint32_t b1; /* barrier 1 */

uint32_t major_vno; /* major version number */

uint32_t minor_vno; /* minor version number */

uint32_t status; /* database status */

uint32_t seed; /* random seed used to avoid collision attacks */

uint32_t dt_size; /* data table size */

uint32_t ft_size; /* free table size */

uint32_t ht_size; /* hash table size */

rel_ptr_t data_table; /* data table pointer relative to mmap base */

rel_ptr_t free_table; /* free table pointer relative to mmap base */

rel_ptr_t hash_table; /* hash table pointer relative to mmap base */

rel_ptr_t reserved; /* reserved for future changes */

uint32_t b2; /* barrier 2 */

};

struct sss_mc_rec {

uint32_t b1; /* barrier 1 */

uint32_t len; /* total record length including record data */

uint64_t expire; /* record expiration time (cast to time_t) */

rel_ptr_t next1; /* ptr of next record rel to data_table */

/* next1 is related to hash1 */

rel_ptr_t next2; /* ptr of next record rel to data_table */

/* next2 is related to hash2 */

uint32_t hash1; /* val of first hash (usually name of record) */

uint32_t hash2; /* val of second hash (usually id of record) */

uint32_t padding; /* padding & reserved for future changes */

uint32_t b2; /* barrier 2 - 32 bytes mark, fits a slot */

char data[0];

};

struct sss_mc_pwd_data {

rel_ptr_t name; /* ptr to name string, rel. to struct base addr */

uint32_t uid;

uint32_t gid;

uint32_t strs_len; /* length of strs */

char strs[0]; /* concatenation of all passwd strings, each

};

struct sss_mc_grp_data {

rel_ptr_t name; /* ptr to name string, rel. to struct base addr */

uint32_t gid;

uint32_t members; /* number of members in strs */

uint32_t strs_len; /* length of strs */

char strs[0]; /* concatenation of all group strings, each

};

struct sss_mc_initgr_data {

rel_ptr_t name; /* ptr to name string, rel. to struct base addr */

uint32_t num_groups; /* number of groups */

uint32_t gids[0]; /* array of all groups

};

#pragma pack()

#endif /* _MMAP_CACHE_H_ */