cache.h

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/************************************************************************
 * Copyright (C) 2005-2009 Philipp Marek.
 *
 * This program is free software;  you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 3 as
 * published by the Free Software Foundation.
 ************************************************************************/

#ifndef __CACHE_H__
#define __CACHE_H__

#include "helper.h"

typedef long cache_value_t;


struct cache_entry_t {
    cache_value_t id;
    cache_value_t hash_data;
    int len;
#if 0

    short accessed;
#endif

    char data[1];
};


#define CACHE_DEFAULT (4)

struct cache_t {
    int max;
    int used;
    int lru;

  struct cache_entry_t *entries[CACHE_DEFAULT+1];
};


int cch__add(struct cache_t *cache, 
        cache_value_t id, const char *data, int len,
        char **copy);

int cch__find(struct cache_t *cache, cache_value_t id, 
        int *index, char **data, int *len);

inline int cch__entry_set(struct cache_entry_t **cache, 
        cache_value_t id, const char *data, int len,
        int copy_old_data,
        char **copy);
    
int cch__set_by_id(struct cache_t *cache, 
        cache_value_t id, const char *data, int len,
        int copy_old_data,
        char **copy);

void cch__set_active(struct cache_t *cache, int index);


__attribute__((gnu_inline, always_inline)) static inline int cch__new_cache(struct cache_t **cache, int max)
{
    int status, len;

    status=0;
    if (!*cache)
    {
        len= sizeof(struct cache_entry_t*)*(max-CACHE_DEFAULT)+
            sizeof(struct cache_t);

        STOPIF( hlp__alloc( cache, len), NULL);

        memset(*cache, 0, len);
        (*cache)->max=max;
    }

ex:
    return status;
}


int cch__hash_find(struct cache_t *cache, 
        const char *key, cache_value_t *data);
int cch__hash_add(struct cache_t *cache, 
        const char *key, cache_value_t value);

#endif

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