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76 lines
2.2 KiB
C
76 lines
2.2 KiB
C
#ifndef KV_PAIR_H
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#define KV_PAIR_H
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#ident "Copyright (c) 2007, 2008 Tokutek Inc. All rights reserved."
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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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unsigned int keylen;
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unsigned 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 unsigned 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, const void *key, unsigned int keylen, const void *val, unsigned int vallen) {
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pair->keylen = keylen;
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memcpy(pair->key, key, (size_t)keylen);
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pair->vallen = vallen;
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memcpy(pair->key + keylen, val, (size_t)vallen);
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}
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static inline struct kv_pair *kv_pair_malloc(const void *key, unsigned int keylen, const void *val, unsigned 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, unsigned 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, (size_t)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 unsigned int kv_pair_keylen(const 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 unsigned int kv_pair_vallen(const struct kv_pair *pair) {
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return pair->vallen;
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}
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#endif
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