fastfind.h

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/* $Id: fastfind.h,v 1.18 2004/10/27 22:35:05 zas Exp $ */

#ifndef EL__UTIL_FASTFIND_H
#define EL__UTIL_FASTFIND_H

/* Whether to use these routines or not. */
#ifndef CONFIG_SMALL
#define USE_FASTFIND 1
#else
#undef USE_FASTFIND
#endif

#ifdef USE_FASTFIND

struct fastfind_key_value {
	unsigned char *key;
	void *data;
};

enum fastfind_flags {
	FF_NONE = 0,
	FF_CASE_AWARE = 1,	/* honour case when comparing */
	FF_COMPRESS = 2,	/* compress nodes if possible */
};

struct fastfind_index {
	/* Description useful for debugging mode. */
	unsigned char *comment;
	/* Start over. */
	void (*reset)(void);
	/* Get next struct fastfind_key_value in line. */
	struct fastfind_key_value *(*next)(void);
	/* Internal reference */
	void *handle;
};

#define INIT_FASTFIND_INDEX(comment, reset, next) \
	{ (comment), (reset), (next) }

/* Initialize and index a list of keys. */
/* Keys are iterated using:
 * @index		index info
 * @flags 		control case sensitivity, compression */
/* This function must be called once and only once per list. */
/* Failure is not an option, so call it at startup. */
struct fastfind_index *fastfind_index(struct fastfind_index *index, enum fastfind_flags flags);

/* The main reason of all that stuff is here. */
/* Search the index for @key with length @key_len using the
 * @index' handle created with fastfind_index(). */
void *fastfind_search(struct fastfind_index *index, unsigned char *key, int key_len);

/* Fastfind cleanup. It frees the index given by the @fastfind_handle. */
/* Must be called once per list. */
void fastfind_done(struct fastfind_index *index);

#endif

#endif /* EL__UTIL_FASTFIND_H */