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100 lines
2.6 KiB
C
100 lines
2.6 KiB
C
#ifndef KV_PAIR_H
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#define KV_PAIR_H
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#include "memory.h"
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#include <string.h>
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/*
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* the key value pair contains a key and a value in a contiguous space. the
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* key is right after the length fields and the value is right after the key.
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*/
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struct kv_pair {
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int keylen;
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int vallen;
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char key[];
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};
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/* return the size of a kv pair */
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static inline int kv_pair_size(struct kv_pair *pair) {
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return sizeof (struct kv_pair) + pair->keylen + pair->vallen;
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}
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static inline void kv_pair_init(struct kv_pair *pair, void *key, int keylen, void *val, int vallen) {
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pair->keylen = keylen;
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memcpy(pair->key, key, keylen);
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pair->vallen = vallen;
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memcpy(pair->key + keylen, val, vallen);
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}
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static inline struct kv_pair *kv_pair_malloc(void *key, int keylen, void *val, int vallen) {
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struct kv_pair *pair = toku_malloc(sizeof (struct kv_pair) + keylen + vallen);
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if (pair)
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kv_pair_init(pair, key, keylen, val, vallen);
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return pair;
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}
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/* replace the val, keep the same key */
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static inline struct kv_pair *kv_pair_realloc_same_key(struct kv_pair *p, void *newval, int newvallen) {
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struct kv_pair *pair = toku_realloc(p, sizeof (struct kv_pair) + p->keylen + newvallen);
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if (pair) {
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pair->vallen = newvallen;
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memcpy(pair->key + pair->keylen, newval, newvallen);
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}
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return pair;
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}
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static inline void kv_pair_free(struct kv_pair *pair) {
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toku_free_n(pair, sizeof(struct kv_pair)+pair->keylen+pair->vallen);
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}
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static inline void *kv_pair_key(struct kv_pair *pair) {
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return pair->key;
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}
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static inline const void *kv_pair_key_const(const struct kv_pair *pair) {
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return pair->key;
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}
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static inline int kv_pair_keylen(struct kv_pair *pair) {
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return pair->keylen;
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}
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static inline void *kv_pair_val(struct kv_pair *pair) {
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return pair->key + pair->keylen;
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}
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static inline const void *kv_pair_val_const(const struct kv_pair *pair) {
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return pair->key + pair->keylen;
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}
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static inline int kv_pair_vallen(struct kv_pair *pair) {
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return pair->vallen;
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}
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/* use the low bit to indicate an inuse pair that is deleted */
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static inline int kv_pair_inuse(struct kv_pair *pair) {
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return pair != 0;
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}
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static inline int kv_pair_deleted(struct kv_pair *pair) {
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return ((long) pair & 1) != 0;
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}
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static inline int kv_pair_valid(struct kv_pair *pair) {
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return kv_pair_inuse(pair) && !kv_pair_deleted(pair);
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}
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static inline struct kv_pair *kv_pair_set_deleted(struct kv_pair *pair) {
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return (struct kv_pair *) ((long) pair | 1);
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}
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static inline struct kv_pair *kv_pair_ptr(struct kv_pair *pair) {
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return (struct kv_pair *) ((long) pair & ~1);
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}
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struct kv_pair_tag {
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struct kv_pair *pair;
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int oldtag, newtag;
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};
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#endif
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