Line data Source code
1 : /*
2 : * Dynamic data buffer
3 : * Copyright (c) 2007-2012, Jouni Malinen <j@w1.fi>
4 : *
5 : * This software may be distributed under the terms of the BSD license.
6 : * See README for more details.
7 : */
8 :
9 : #ifndef WPABUF_H
10 : #define WPABUF_H
11 :
12 : /* wpabuf::buf is a pointer to external data */
13 : #define WPABUF_FLAG_EXT_DATA BIT(0)
14 :
15 : /*
16 : * Internal data structure for wpabuf. Please do not touch this directly from
17 : * elsewhere. This is only defined in header file to allow inline functions
18 : * from this file to access data.
19 : */
20 : struct wpabuf {
21 : size_t size; /* total size of the allocated buffer */
22 : size_t used; /* length of data in the buffer */
23 : u8 *buf; /* pointer to the head of the buffer */
24 : unsigned int flags;
25 : /* optionally followed by the allocated buffer */
26 : };
27 :
28 :
29 : int wpabuf_resize(struct wpabuf **buf, size_t add_len);
30 : struct wpabuf * wpabuf_alloc(size_t len);
31 : struct wpabuf * wpabuf_alloc_ext_data(u8 *data, size_t len);
32 : struct wpabuf * wpabuf_alloc_copy(const void *data, size_t len);
33 : struct wpabuf * wpabuf_dup(const struct wpabuf *src);
34 : void wpabuf_free(struct wpabuf *buf);
35 : void wpabuf_clear_free(struct wpabuf *buf);
36 : void * wpabuf_put(struct wpabuf *buf, size_t len);
37 : struct wpabuf * wpabuf_concat(struct wpabuf *a, struct wpabuf *b);
38 : struct wpabuf * wpabuf_zeropad(struct wpabuf *buf, size_t len);
39 : void wpabuf_printf(struct wpabuf *buf, char *fmt, ...) PRINTF_FORMAT(2, 3);
40 : struct wpabuf * wpabuf_parse_bin(const char *buf);
41 :
42 :
43 : /**
44 : * wpabuf_size - Get the currently allocated size of a wpabuf buffer
45 : * @buf: wpabuf buffer
46 : * Returns: Currently allocated size of the buffer
47 : */
48 5114 : static inline size_t wpabuf_size(const struct wpabuf *buf)
49 : {
50 5114 : return buf->size;
51 : }
52 :
53 : /**
54 : * wpabuf_len - Get the current length of a wpabuf buffer data
55 : * @buf: wpabuf buffer
56 : * Returns: Currently used length of the buffer
57 : */
58 2996469 : static inline size_t wpabuf_len(const struct wpabuf *buf)
59 : {
60 2996469 : return buf->used;
61 : }
62 :
63 : /**
64 : * wpabuf_tailroom - Get size of available tail room in the end of the buffer
65 : * @buf: wpabuf buffer
66 : * Returns: Tail room (in bytes) of available space in the end of the buffer
67 : */
68 260650 : static inline size_t wpabuf_tailroom(const struct wpabuf *buf)
69 : {
70 260650 : return buf->size - buf->used;
71 : }
72 :
73 : /**
74 : * wpabuf_head - Get pointer to the head of the buffer data
75 : * @buf: wpabuf buffer
76 : * Returns: Pointer to the head of the buffer data
77 : */
78 926562 : static inline const void * wpabuf_head(const struct wpabuf *buf)
79 : {
80 926562 : return buf->buf;
81 : }
82 :
83 349767 : static inline const u8 * wpabuf_head_u8(const struct wpabuf *buf)
84 : {
85 349767 : return (const u8 *) wpabuf_head(buf);
86 : }
87 :
88 : /**
89 : * wpabuf_mhead - Get modifiable pointer to the head of the buffer data
90 : * @buf: wpabuf buffer
91 : * Returns: Pointer to the head of the buffer data
92 : */
93 3112172 : static inline void * wpabuf_mhead(struct wpabuf *buf)
94 : {
95 3112172 : return buf->buf;
96 : }
97 :
98 3075191 : static inline u8 * wpabuf_mhead_u8(struct wpabuf *buf)
99 : {
100 3075191 : return (u8 *) wpabuf_mhead(buf);
101 : }
102 :
103 468463 : static inline void wpabuf_put_u8(struct wpabuf *buf, u8 data)
104 : {
105 468463 : u8 *pos = (u8 *) wpabuf_put(buf, 1);
106 468463 : *pos = data;
107 468463 : }
108 :
109 36138 : static inline void wpabuf_put_le16(struct wpabuf *buf, u16 data)
110 : {
111 36138 : u8 *pos = (u8 *) wpabuf_put(buf, 2);
112 36138 : WPA_PUT_LE16(pos, data);
113 36138 : }
114 :
115 374 : static inline void wpabuf_put_le32(struct wpabuf *buf, u32 data)
116 : {
117 374 : u8 *pos = (u8 *) wpabuf_put(buf, 4);
118 374 : WPA_PUT_LE32(pos, data);
119 374 : }
120 :
121 473054 : static inline void wpabuf_put_be16(struct wpabuf *buf, u16 data)
122 : {
123 473054 : u8 *pos = (u8 *) wpabuf_put(buf, 2);
124 473054 : WPA_PUT_BE16(pos, data);
125 473054 : }
126 :
127 34548 : static inline void wpabuf_put_be24(struct wpabuf *buf, u32 data)
128 : {
129 34548 : u8 *pos = (u8 *) wpabuf_put(buf, 3);
130 34548 : WPA_PUT_BE24(pos, data);
131 34548 : }
132 :
133 42487 : static inline void wpabuf_put_be32(struct wpabuf *buf, u32 data)
134 : {
135 42487 : u8 *pos = (u8 *) wpabuf_put(buf, 4);
136 42487 : WPA_PUT_BE32(pos, data);
137 42487 : }
138 :
139 531775 : static inline void wpabuf_put_data(struct wpabuf *buf, const void *data,
140 : size_t len)
141 : {
142 531775 : if (data)
143 528090 : os_memcpy(wpabuf_put(buf, len), data, len);
144 531775 : }
145 :
146 35831 : static inline void wpabuf_put_buf(struct wpabuf *dst,
147 : const struct wpabuf *src)
148 : {
149 35831 : wpabuf_put_data(dst, wpabuf_head(src), wpabuf_len(src));
150 35831 : }
151 :
152 11580 : static inline void wpabuf_set(struct wpabuf *buf, const void *data, size_t len)
153 : {
154 11580 : buf->buf = (u8 *) data;
155 11580 : buf->flags = WPABUF_FLAG_EXT_DATA;
156 11580 : buf->size = buf->used = len;
157 11580 : }
158 :
159 33936 : static inline void wpabuf_put_str(struct wpabuf *dst, const char *str)
160 : {
161 33936 : wpabuf_put_data(dst, str, os_strlen(str));
162 33936 : }
163 :
164 : #endif /* WPABUF_H */
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