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#ifndef __LINUX_TEXTSEARCH_H

#define __LINUX_TEXTSEARCH_H

#ifdef __KERNEL__

#include <linux/types.h>

#include <linux/list.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/err.h>

#include <linux/slab.h>

struct ts_config;

/**

 * TS_AUTOLOAD - Automatically load textsearch modules when needed

 */

#define TS_AUTOLOAD     1

/**

 * struct ts_state - search state

 * @offset: offset for next match

 * @cb: control buffer, for persistent variables of get_next_block()

 */

struct ts_state

{

        unsigned int            offset;

        char                    cb[40];

};

/**

 * struct ts_ops - search module operations

 * @name: name of search algorithm

 * @init: initialization function to prepare a search

 * @find: find the next occurrence of the pattern

 * @destroy: destroy algorithm specific parts of a search configuration

 * @get_pattern: return head of pattern

 * @get_pattern_len: return length of pattern

 * @owner: module reference to algorithm

 */

struct ts_ops

{

        const char              *name;

        struct ts_config *      (*init)(const void *, unsigned int, gfp_t);

        unsigned int            (*find)(struct ts_config *,

                                        struct ts_state *);

        void                    (*destroy)(struct ts_config *);

        void *                  (*get_pattern)(struct ts_config *);

        unsigned int            (*get_pattern_len)(struct ts_config *);

        struct module           *owner;

        struct list_head        list;

};

/**

 * struct ts_config - search configuration

 * @ops: operations of chosen algorithm

 * @get_next_block: callback to fetch the next block to search in

 * @finish: callback to finalize a search

 */

struct ts_config

{

        struct ts_ops           *ops;

        /**

         * get_next_block - fetch next block of data

         * @consumed: number of bytes consumed by the caller

         * @dst: destination buffer

         * @conf: search configuration

         * @state: search state

         *

         * Called repeatedly until 0 is returned. Must assign the

         * head of the next block of data to &*dst and return the length

         * of the block or 0 if at the end. consumed == 0 indicates

         * a new search. May store/read persistent values in state->cb.

         */

        unsigned int            (*get_next_block)(unsigned int consumed,

                                                  const u8 **dst,

                                                  struct ts_config *conf,

                                                  struct ts_state *state);

        /**

         * finish - finalize/clean a series of get_next_block() calls

         * @conf: search configuration

         * @state: search state

         *

         * Called after the last use of get_next_block(), may be used

         * to cleanup any leftovers.

         */

        void                    (*finish)(struct ts_config *conf,

                                          struct ts_state *state);

};

/**

 * textsearch_next - continue searching for a pattern

 * @conf: search configuration

 * @state: search state

 *

 * Continues a search looking for more occurrences of the pattern.

 * textsearch_find() must be called to find the first occurrence

 * in order to reset the state.

 *

 * Returns the position of the next occurrence of the pattern or

 * UINT_MAX if not match was found.

 */

static inline unsigned int textsearch_next(struct ts_config *conf,

                                           struct ts_state *state)

{

        unsigned int ret = conf->ops->find(conf, state);

        if (conf->finish)

                conf->finish(conf, state);

        return ret;

}

/**

 * textsearch_find - start searching for a pattern

 * @conf: search configuration

 * @state: search state

 *

 * Returns the position of first occurrence of the pattern or

 * UINT_MAX if no match was found.

 */

static inline unsigned int textsearch_find(struct ts_config *conf,

                                           struct ts_state *state)

{

        state->offset = 0;

        return textsearch_next(conf, state);

}

/**

 * textsearch_get_pattern - return head of the pattern

 * @conf: search configuration

 */

static inline void *textsearch_get_pattern(struct ts_config *conf)

{

        return conf->ops->get_pattern(conf);

}

/**

 * textsearch_get_pattern_len - return length of the pattern

 * @conf: search configuration

 */

static inline unsigned int textsearch_get_pattern_len(struct ts_config *conf)

{

        return conf->ops->get_pattern_len(conf);

}

extern int textsearch_register(struct ts_ops *);

extern int textsearch_unregister(struct ts_ops *);

extern struct ts_config *textsearch_prepare(const char *, const void *,

                                            unsigned int, gfp_t, int);

extern void textsearch_destroy(struct ts_config *conf);

extern unsigned int textsearch_find_continuous(struct ts_config *,

                                               struct ts_state *,

                                               const void *, unsigned int);

#define TS_PRIV_ALIGNTO 8

#define TS_PRIV_ALIGN(len) (((len) + TS_PRIV_ALIGNTO-1) & ~(TS_PRIV_ALIGNTO-1))

static inline struct ts_config *alloc_ts_config(size_t payload,

                                                gfp_t gfp_mask)

{

        struct ts_config *conf;

        conf = kmalloc(TS_PRIV_ALIGN(sizeof(*conf)) + payload, gfp_mask);

        if (conf == NULL)

                return ERR_PTR(-ENOMEM);

        memset(conf, 0, TS_PRIV_ALIGN(sizeof(*conf)) + payload);

        return conf;

}

static inline void *ts_config_priv(struct ts_config *conf)

{

        return ((u8 *) conf + TS_PRIV_ALIGN(sizeof(struct ts_config)));

}

#endif /* __KERNEL__ */

#endif