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 */
wpabuf_size(const struct wpabuf * buf)48 static inline size_t wpabuf_size(const struct wpabuf *buf)
49 {
50 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 */
wpabuf_len(const struct wpabuf * buf)58 static inline size_t wpabuf_len(const struct wpabuf *buf)
59 {
60 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 */
wpabuf_tailroom(const struct wpabuf * buf)68 static inline size_t wpabuf_tailroom(const struct wpabuf *buf)
69 {
70 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 */
wpabuf_head(const struct wpabuf * buf)78 static inline const void * wpabuf_head(const struct wpabuf *buf)
79 {
80 return buf->buf;
81 }
82
wpabuf_head_u8(const struct wpabuf * buf)83 static inline const u8 * wpabuf_head_u8(const struct wpabuf *buf)
84 {
85 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 */
wpabuf_mhead(struct wpabuf * buf)93 static inline void * wpabuf_mhead(struct wpabuf *buf)
94 {
95 return buf->buf;
96 }
97
wpabuf_mhead_u8(struct wpabuf * buf)98 static inline u8 * wpabuf_mhead_u8(struct wpabuf *buf)
99 {
100 return (u8 *) wpabuf_mhead(buf);
101 }
102
wpabuf_put_u8(struct wpabuf * buf,u8 data)103 static inline void wpabuf_put_u8(struct wpabuf *buf, u8 data)
104 {
105 u8 *pos = (u8 *) wpabuf_put(buf, 1);
106 *pos = data;
107 }
108
wpabuf_put_le16(struct wpabuf * buf,u16 data)109 static inline void wpabuf_put_le16(struct wpabuf *buf, u16 data)
110 {
111 u8 *pos = (u8 *) wpabuf_put(buf, 2);
112 WPA_PUT_LE16(pos, data);
113 }
114
wpabuf_put_le32(struct wpabuf * buf,u32 data)115 static inline void wpabuf_put_le32(struct wpabuf *buf, u32 data)
116 {
117 u8 *pos = (u8 *) wpabuf_put(buf, 4);
118 WPA_PUT_LE32(pos, data);
119 }
120
wpabuf_put_be16(struct wpabuf * buf,u16 data)121 static inline void wpabuf_put_be16(struct wpabuf *buf, u16 data)
122 {
123 u8 *pos = (u8 *) wpabuf_put(buf, 2);
124 WPA_PUT_BE16(pos, data);
125 }
126
wpabuf_put_be24(struct wpabuf * buf,u32 data)127 static inline void wpabuf_put_be24(struct wpabuf *buf, u32 data)
128 {
129 u8 *pos = (u8 *) wpabuf_put(buf, 3);
130 WPA_PUT_BE24(pos, data);
131 }
132
wpabuf_put_be32(struct wpabuf * buf,u32 data)133 static inline void wpabuf_put_be32(struct wpabuf *buf, u32 data)
134 {
135 u8 *pos = (u8 *) wpabuf_put(buf, 4);
136 WPA_PUT_BE32(pos, data);
137 }
138
wpabuf_put_data(struct wpabuf * buf,const void * data,size_t len)139 static inline void wpabuf_put_data(struct wpabuf *buf, const void *data,
140 size_t len)
141 {
142 if (data)
143 os_memcpy(wpabuf_put(buf, len), data, len);
144 }
145
wpabuf_put_buf(struct wpabuf * dst,const struct wpabuf * src)146 static inline void wpabuf_put_buf(struct wpabuf *dst,
147 const struct wpabuf *src)
148 {
149 wpabuf_put_data(dst, wpabuf_head(src), wpabuf_len(src));
150 }
151
wpabuf_set(struct wpabuf * buf,const void * data,size_t len)152 static inline void wpabuf_set(struct wpabuf *buf, const void *data, size_t len)
153 {
154 buf->buf = (u8 *) data;
155 buf->flags = WPABUF_FLAG_EXT_DATA;
156 buf->size = buf->used = len;
157 }
158
wpabuf_put_str(struct wpabuf * dst,const char * str)159 static inline void wpabuf_put_str(struct wpabuf *dst, const char *str)
160 {
161 wpabuf_put_data(dst, str, os_strlen(str));
162 }
163
164 #endif /* WPABUF_H */
165