3 * Copyright (c) 2007, Jouni Malinen <j@w1.fi>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
9 * Alternatively, this software may be distributed under the terms of BSD
12 * See README and COPYING for more details.
19 * Internal data structure for wpabuf. Please do not touch this directly from
20 * elsewhere. This is only defined in header file to allow inline functions
21 * from this file to access data.
24 size_t size; /* total size of the allocated buffer */
25 size_t used; /* length of data in the buffer */
26 u8 *ext_data; /* pointer to external data; NULL if data follows
28 /* optionally followed by the allocated buffer */
32 int wpabuf_resize(struct wpabuf **buf, size_t add_len);
33 struct wpabuf * wpabuf_alloc(size_t len);
34 struct wpabuf * wpabuf_alloc_ext_data(u8 *data, size_t len);
35 struct wpabuf * wpabuf_alloc_copy(const void *data, size_t len);
36 struct wpabuf * wpabuf_dup(const struct wpabuf *src);
37 void wpabuf_free(struct wpabuf *buf);
38 void * wpabuf_put(struct wpabuf *buf, size_t len);
39 struct wpabuf * wpabuf_concat(struct wpabuf *a, struct wpabuf *b);
40 struct wpabuf * wpabuf_zeropad(struct wpabuf *buf, size_t len);
44 * wpabuf_size - Get the currently allocated size of a wpabuf buffer
46 * Returns: Currently allocated size of the buffer
48 static inline size_t wpabuf_size(const struct wpabuf *buf)
54 * wpabuf_len - Get the current length of a wpabuf buffer data
56 * Returns: Currently used length of the buffer
58 static inline size_t wpabuf_len(const struct wpabuf *buf)
64 * wpabuf_tailroom - Get size of available tail room in the end of the buffer
66 * Returns: Tail room (in bytes) of available space in the end of the buffer
68 static inline size_t wpabuf_tailroom(const struct wpabuf *buf)
70 return buf->size - buf->used;
74 * wpabuf_head - Get pointer to the head of the buffer data
76 * Returns: Pointer to the head of the buffer data
78 static inline const void * wpabuf_head(const struct wpabuf *buf)
85 static inline const u8 * wpabuf_head_u8(const struct wpabuf *buf)
87 return wpabuf_head(buf);
91 * wpabuf_mhead - Get modifiable pointer to the head of the buffer data
93 * Returns: Pointer to the head of the buffer data
95 static inline void * wpabuf_mhead(struct wpabuf *buf)
102 static inline u8 * wpabuf_mhead_u8(struct wpabuf *buf)
104 return wpabuf_mhead(buf);
107 static inline void wpabuf_put_u8(struct wpabuf *buf, u8 data)
109 u8 *pos = wpabuf_put(buf, 1);
113 static inline void wpabuf_put_be16(struct wpabuf *buf, u16 data)
115 u8 *pos = wpabuf_put(buf, 2);
116 WPA_PUT_BE16(pos, data);
119 static inline void wpabuf_put_be24(struct wpabuf *buf, u32 data)
121 u8 *pos = wpabuf_put(buf, 3);
122 WPA_PUT_BE24(pos, data);
125 static inline void wpabuf_put_be32(struct wpabuf *buf, u32 data)
127 u8 *pos = wpabuf_put(buf, 4);
128 WPA_PUT_BE32(pos, data);
131 static inline void wpabuf_put_data(struct wpabuf *buf, const void *data,
135 os_memcpy(wpabuf_put(buf, len), data, len);
138 static inline void wpabuf_put_buf(struct wpabuf *dst,
139 const struct wpabuf *src)
141 wpabuf_put_data(dst, wpabuf_head(src), wpabuf_len(src));
144 static inline void wpabuf_set(struct wpabuf *buf, const void *data, size_t len)
146 buf->ext_data = (u8 *) data;
147 buf->size = buf->used = len;
150 #endif /* WPABUF_H */