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1 | #ifndef __LINUX_TEXTSEARCH_H |
2 | #define __LINUX_TEXTSEARCH_H |
3 | |
4 | #include <linux/types.h> |
5 | #include <linux/list.h> |
6 | #include <linux/kernel.h> |
7 | #include <linux/module.h> |
8 | #include <linux/err.h> |
9 | #include <linux/slab.h> |
10 | |
11 | struct ts_config; |
12 | |
13 | #define TS_AUTOLOAD 1 /* Automatically load textsearch modules when needed */ |
14 | #define TS_IGNORECASE 2 /* Searches string case insensitively */ |
15 | |
16 | /** |
17 | * struct ts_state - search state |
18 | * @offset: offset for next match |
19 | * @cb: control buffer, for persistent variables of get_next_block() |
20 | */ |
21 | struct ts_state |
22 | { |
23 | unsigned int offset; |
24 | char cb[40]; |
25 | }; |
26 | |
27 | /** |
28 | * struct ts_ops - search module operations |
29 | * @name: name of search algorithm |
30 | * @init: initialization function to prepare a search |
31 | * @find: find the next occurrence of the pattern |
32 | * @destroy: destroy algorithm specific parts of a search configuration |
33 | * @get_pattern: return head of pattern |
34 | * @get_pattern_len: return length of pattern |
35 | * @owner: module reference to algorithm |
36 | */ |
37 | struct ts_ops |
38 | { |
39 | const char *name; |
40 | struct ts_config * (*init)(const void *, unsigned int, gfp_t, int); |
41 | unsigned int (*find)(struct ts_config *, |
42 | struct ts_state *); |
43 | void (*destroy)(struct ts_config *); |
44 | void * (*get_pattern)(struct ts_config *); |
45 | unsigned int (*get_pattern_len)(struct ts_config *); |
46 | struct module *owner; |
47 | struct list_head list; |
48 | }; |
49 | |
50 | /** |
51 | * struct ts_config - search configuration |
52 | * @ops: operations of chosen algorithm |
53 | * @flags: flags |
54 | * @get_next_block: callback to fetch the next block to search in |
55 | * @finish: callback to finalize a search |
56 | */ |
57 | struct ts_config |
58 | { |
59 | struct ts_ops *ops; |
60 | int flags; |
61 | |
62 | /** |
63 | * get_next_block - fetch next block of data |
64 | * @consumed: number of bytes consumed by the caller |
65 | * @dst: destination buffer |
66 | * @conf: search configuration |
67 | * @state: search state |
68 | * |
69 | * Called repeatedly until 0 is returned. Must assign the |
70 | * head of the next block of data to &*dst and return the length |
71 | * of the block or 0 if at the end. consumed == 0 indicates |
72 | * a new search. May store/read persistent values in state->cb. |
73 | */ |
74 | unsigned int (*get_next_block)(unsigned int consumed, |
75 | const u8 **dst, |
76 | struct ts_config *conf, |
77 | struct ts_state *state); |
78 | |
79 | /** |
80 | * finish - finalize/clean a series of get_next_block() calls |
81 | * @conf: search configuration |
82 | * @state: search state |
83 | * |
84 | * Called after the last use of get_next_block(), may be used |
85 | * to cleanup any leftovers. |
86 | */ |
87 | void (*finish)(struct ts_config *conf, |
88 | struct ts_state *state); |
89 | }; |
90 | |
91 | /** |
92 | * textsearch_next - continue searching for a pattern |
93 | * @conf: search configuration |
94 | * @state: search state |
95 | * |
96 | * Continues a search looking for more occurrences of the pattern. |
97 | * textsearch_find() must be called to find the first occurrence |
98 | * in order to reset the state. |
99 | * |
100 | * Returns the position of the next occurrence of the pattern or |
101 | * UINT_MAX if not match was found. |
102 | */ |
103 | static inline unsigned int textsearch_next(struct ts_config *conf, |
104 | struct ts_state *state) |
105 | { |
106 | unsigned int ret = conf->ops->find(conf, state); |
107 | |
108 | if (conf->finish) |
109 | conf->finish(conf, state); |
110 | |
111 | return ret; |
112 | } |
113 | |
114 | /** |
115 | * textsearch_find - start searching for a pattern |
116 | * @conf: search configuration |
117 | * @state: search state |
118 | * |
119 | * Returns the position of first occurrence of the pattern or |
120 | * UINT_MAX if no match was found. |
121 | */ |
122 | static inline unsigned int textsearch_find(struct ts_config *conf, |
123 | struct ts_state *state) |
124 | { |
125 | state->offset = 0; |
126 | return textsearch_next(conf, state); |
127 | } |
128 | |
129 | /** |
130 | * textsearch_get_pattern - return head of the pattern |
131 | * @conf: search configuration |
132 | */ |
133 | static inline void *textsearch_get_pattern(struct ts_config *conf) |
134 | { |
135 | return conf->ops->get_pattern(conf); |
136 | } |
137 | |
138 | /** |
139 | * textsearch_get_pattern_len - return length of the pattern |
140 | * @conf: search configuration |
141 | */ |
142 | static inline unsigned int textsearch_get_pattern_len(struct ts_config *conf) |
143 | { |
144 | return conf->ops->get_pattern_len(conf); |
145 | } |
146 | |
147 | extern int textsearch_register(struct ts_ops *); |
148 | extern int textsearch_unregister(struct ts_ops *); |
149 | extern struct ts_config *textsearch_prepare(const char *, const void *, |
150 | unsigned int, gfp_t, int); |
151 | extern void textsearch_destroy(struct ts_config *conf); |
152 | extern unsigned int textsearch_find_continuous(struct ts_config *, |
153 | struct ts_state *, |
154 | const void *, unsigned int); |
155 | |
156 | |
157 | #define TS_PRIV_ALIGNTO 8 |
158 | #define TS_PRIV_ALIGN(len) (((len) + TS_PRIV_ALIGNTO-1) & ~(TS_PRIV_ALIGNTO-1)) |
159 | |
160 | static inline struct ts_config *alloc_ts_config(size_t payload, |
161 | gfp_t gfp_mask) |
162 | { |
163 | struct ts_config *conf; |
164 | |
165 | conf = kzalloc(TS_PRIV_ALIGN(sizeof(*conf)) + payload, gfp_mask); |
166 | if (conf == NULL) |
167 | return ERR_PTR(-ENOMEM); |
168 | |
169 | return conf; |
170 | } |
171 | |
172 | static inline void *ts_config_priv(struct ts_config *conf) |
173 | { |
174 | return ((u8 *) conf + TS_PRIV_ALIGN(sizeof(struct ts_config))); |
175 | } |
176 | |
177 | #endif |
178 |
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