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 :
41 :
42 : /**
43 : * wpabuf_size - Get the currently allocated size of a wpabuf buffer
44 : * @buf: wpabuf buffer
45 : * Returns: Currently allocated size of the buffer
46 : */
47 2723 : static inline size_t wpabuf_size(const struct wpabuf *buf)
48 : {
49 2723 : return buf->size;
50 : }
51 :
52 : /**
53 : * wpabuf_len - Get the current length of a wpabuf buffer data
54 : * @buf: wpabuf buffer
55 : * Returns: Currently used length of the buffer
56 : */
57 2057720 : static inline size_t wpabuf_len(const struct wpabuf *buf)
58 : {
59 2057720 : return buf->used;
60 : }
61 :
62 : /**
63 : * wpabuf_tailroom - Get size of available tail room in the end of the buffer
64 : * @buf: wpabuf buffer
65 : * Returns: Tail room (in bytes) of available space in the end of the buffer
66 : */
67 165734 : static inline size_t wpabuf_tailroom(const struct wpabuf *buf)
68 : {
69 165734 : return buf->size - buf->used;
70 : }
71 :
72 : /**
73 : * wpabuf_head - Get pointer to the head of the buffer data
74 : * @buf: wpabuf buffer
75 : * Returns: Pointer to the head of the buffer data
76 : */
77 542994 : static inline const void * wpabuf_head(const struct wpabuf *buf)
78 : {
79 542994 : return buf->buf;
80 : }
81 :
82 178653 : static inline const u8 * wpabuf_head_u8(const struct wpabuf *buf)
83 : {
84 178653 : return wpabuf_head(buf);
85 : }
86 :
87 : /**
88 : * wpabuf_mhead - Get modifiable pointer to the head of the buffer data
89 : * @buf: wpabuf buffer
90 : * Returns: Pointer to the head of the buffer data
91 : */
92 1971362 : static inline void * wpabuf_mhead(struct wpabuf *buf)
93 : {
94 1971362 : return buf->buf;
95 : }
96 :
97 1953919 : static inline u8 * wpabuf_mhead_u8(struct wpabuf *buf)
98 : {
99 1953919 : return wpabuf_mhead(buf);
100 : }
101 :
102 331092 : static inline void wpabuf_put_u8(struct wpabuf *buf, u8 data)
103 : {
104 331092 : u8 *pos = wpabuf_put(buf, 1);
105 331092 : *pos = data;
106 331092 : }
107 :
108 26675 : static inline void wpabuf_put_le16(struct wpabuf *buf, u16 data)
109 : {
110 26675 : u8 *pos = wpabuf_put(buf, 2);
111 26675 : WPA_PUT_LE16(pos, data);
112 26675 : }
113 :
114 259 : static inline void wpabuf_put_le32(struct wpabuf *buf, u32 data)
115 : {
116 259 : u8 *pos = wpabuf_put(buf, 4);
117 259 : WPA_PUT_LE32(pos, data);
118 259 : }
119 :
120 399633 : static inline void wpabuf_put_be16(struct wpabuf *buf, u16 data)
121 : {
122 399633 : u8 *pos = wpabuf_put(buf, 2);
123 399633 : WPA_PUT_BE16(pos, data);
124 399633 : }
125 :
126 22756 : static inline void wpabuf_put_be24(struct wpabuf *buf, u32 data)
127 : {
128 22756 : u8 *pos = wpabuf_put(buf, 3);
129 22756 : WPA_PUT_BE24(pos, data);
130 22756 : }
131 :
132 34738 : static inline void wpabuf_put_be32(struct wpabuf *buf, u32 data)
133 : {
134 34738 : u8 *pos = wpabuf_put(buf, 4);
135 34738 : WPA_PUT_BE32(pos, data);
136 34738 : }
137 :
138 346806 : static inline void wpabuf_put_data(struct wpabuf *buf, const void *data,
139 : size_t len)
140 : {
141 346806 : if (data)
142 344718 : os_memcpy(wpabuf_put(buf, len), data, len);
143 346806 : }
144 :
145 26191 : static inline void wpabuf_put_buf(struct wpabuf *dst,
146 : const struct wpabuf *src)
147 : {
148 26191 : wpabuf_put_data(dst, wpabuf_head(src), wpabuf_len(src));
149 26191 : }
150 :
151 7207 : static inline void wpabuf_set(struct wpabuf *buf, const void *data, size_t len)
152 : {
153 7207 : buf->buf = (u8 *) data;
154 7207 : buf->flags = WPABUF_FLAG_EXT_DATA;
155 7207 : buf->size = buf->used = len;
156 7207 : }
157 :
158 32158 : static inline void wpabuf_put_str(struct wpabuf *dst, const char *str)
159 : {
160 32158 : wpabuf_put_data(dst, str, os_strlen(str));
161 32158 : }
162 :
163 : #endif /* WPABUF_H */
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