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[/] [test_project/] [trunk/] [linux_sd_driver/] [include/] [linux/] [textsearch.h] - Blame information for rev 62

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1 62 marcus.erl
#ifndef __LINUX_TEXTSEARCH_H
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#define __LINUX_TEXTSEARCH_H
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#ifdef __KERNEL__
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#include <linux/types.h>
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#include <linux/list.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/err.h>
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#include <linux/slab.h>
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struct ts_config;
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/**
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 * TS_AUTOLOAD - Automatically load textsearch modules when needed
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 */
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#define TS_AUTOLOAD     1
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/**
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 * struct ts_state - search state
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 * @offset: offset for next match
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 * @cb: control buffer, for persistent variables of get_next_block()
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 */
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struct ts_state
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{
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        unsigned int            offset;
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        char                    cb[40];
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};
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/**
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 * struct ts_ops - search module operations
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 * @name: name of search algorithm
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 * @init: initialization function to prepare a search
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 * @find: find the next occurrence of the pattern
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 * @destroy: destroy algorithm specific parts of a search configuration
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 * @get_pattern: return head of pattern
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 * @get_pattern_len: return length of pattern
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 * @owner: module reference to algorithm
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 */
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struct ts_ops
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{
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        const char              *name;
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        struct ts_config *      (*init)(const void *, unsigned int, gfp_t);
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        unsigned int            (*find)(struct ts_config *,
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                                        struct ts_state *);
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        void                    (*destroy)(struct ts_config *);
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        void *                  (*get_pattern)(struct ts_config *);
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        unsigned int            (*get_pattern_len)(struct ts_config *);
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        struct module           *owner;
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        struct list_head        list;
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};
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/**
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 * struct ts_config - search configuration
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 * @ops: operations of chosen algorithm
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 * @get_next_block: callback to fetch the next block to search in
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 * @finish: callback to finalize a search
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 */
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struct ts_config
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{
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        struct ts_ops           *ops;
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        /**
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         * get_next_block - fetch next block of data
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         * @consumed: number of bytes consumed by the caller
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         * @dst: destination buffer
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         * @conf: search configuration
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         * @state: search state
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         *
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         * Called repeatedly until 0 is returned. Must assign the
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         * head of the next block of data to &*dst and return the length
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         * of the block or 0 if at the end. consumed == 0 indicates
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         * a new search. May store/read persistent values in state->cb.
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         */
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        unsigned int            (*get_next_block)(unsigned int consumed,
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                                                  const u8 **dst,
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                                                  struct ts_config *conf,
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                                                  struct ts_state *state);
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        /**
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         * finish - finalize/clean a series of get_next_block() calls
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         * @conf: search configuration
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         * @state: search state
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         *
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         * Called after the last use of get_next_block(), may be used
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         * to cleanup any leftovers.
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         */
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        void                    (*finish)(struct ts_config *conf,
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                                          struct ts_state *state);
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};
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/**
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 * textsearch_next - continue searching for a pattern
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 * @conf: search configuration
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 * @state: search state
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 *
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 * Continues a search looking for more occurrences of the pattern.
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 * textsearch_find() must be called to find the first occurrence
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 * in order to reset the state.
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 *
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 * Returns the position of the next occurrence of the pattern or
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 * UINT_MAX if not match was found.
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 */
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static inline unsigned int textsearch_next(struct ts_config *conf,
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                                           struct ts_state *state)
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{
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        unsigned int ret = conf->ops->find(conf, state);
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        if (conf->finish)
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                conf->finish(conf, state);
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        return ret;
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}
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/**
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 * textsearch_find - start searching for a pattern
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 * @conf: search configuration
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 * @state: search state
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 *
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 * Returns the position of first occurrence of the pattern or
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 * UINT_MAX if no match was found.
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 */
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static inline unsigned int textsearch_find(struct ts_config *conf,
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                                           struct ts_state *state)
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{
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        state->offset = 0;
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        return textsearch_next(conf, state);
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}
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/**
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 * textsearch_get_pattern - return head of the pattern
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 * @conf: search configuration
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 */
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static inline void *textsearch_get_pattern(struct ts_config *conf)
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{
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        return conf->ops->get_pattern(conf);
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}
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/**
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 * textsearch_get_pattern_len - return length of the pattern
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 * @conf: search configuration
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 */
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static inline unsigned int textsearch_get_pattern_len(struct ts_config *conf)
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{
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        return conf->ops->get_pattern_len(conf);
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}
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extern int textsearch_register(struct ts_ops *);
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extern int textsearch_unregister(struct ts_ops *);
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extern struct ts_config *textsearch_prepare(const char *, const void *,
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                                            unsigned int, gfp_t, int);
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extern void textsearch_destroy(struct ts_config *conf);
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extern unsigned int textsearch_find_continuous(struct ts_config *,
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                                               struct ts_state *,
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                                               const void *, unsigned int);
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#define TS_PRIV_ALIGNTO 8
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#define TS_PRIV_ALIGN(len) (((len) + TS_PRIV_ALIGNTO-1) & ~(TS_PRIV_ALIGNTO-1))
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static inline struct ts_config *alloc_ts_config(size_t payload,
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                                                gfp_t gfp_mask)
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{
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        struct ts_config *conf;
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        conf = kmalloc(TS_PRIV_ALIGN(sizeof(*conf)) + payload, gfp_mask);
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        if (conf == NULL)
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                return ERR_PTR(-ENOMEM);
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        memset(conf, 0, TS_PRIV_ALIGN(sizeof(*conf)) + payload);
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        return conf;
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}
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static inline void *ts_config_priv(struct ts_config *conf)
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{
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        return ((u8 *) conf + TS_PRIV_ALIGN(sizeof(struct ts_config)));
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}
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#endif /* __KERNEL__ */
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#endif

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