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179 lines
4.7 KiB
179 lines
4.7 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef __LINUX_TEXTSEARCH_H |
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#define __LINUX_TEXTSEARCH_H |
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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/err.h> |
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#include <linux/slab.h> |
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struct module; |
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struct ts_config; |
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#define TS_AUTOLOAD 1 /* Automatically load textsearch modules when needed */ |
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#define TS_IGNORECASE 2 /* Searches string case insensitively */ |
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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[48]; |
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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, int); |
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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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* @flags: flags |
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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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int flags; |
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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 = kzalloc(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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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
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