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- /*
- * Dynamic data buffer
- * Copyright (c) 2007, Jouni Malinen <j@w1.fi>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * Alternatively, this software may be distributed under the terms of BSD
- * license.
- *
- * See README and COPYING for more details.
- */
- #ifndef WPABUF_H
- #define WPABUF_H
- /*
- * Internal data structure for wpabuf. Please do not touch this directly from
- * elsewhere. This is only defined in header file to allow inline functions
- * from this file to access data.
- */
- struct wpabuf {
- size_t size; /* total size of the allocated buffer */
- size_t used; /* length of data in the buffer */
- u8 *ext_data; /* pointer to external data; NULL if data follows
- * struct wpabuf */
- /* optionally followed by the allocated buffer */
- };
- int wpabuf_resize(struct wpabuf **buf, size_t add_len);
- struct wpabuf * wpabuf_alloc(size_t len);
- struct wpabuf * wpabuf_alloc_ext_data(u8 *data, size_t len);
- struct wpabuf * wpabuf_alloc_copy(const void *data, size_t len);
- struct wpabuf * wpabuf_dup(const struct wpabuf *src);
- void wpabuf_free(struct wpabuf *buf);
- void * wpabuf_put(struct wpabuf *buf, size_t len);
- struct wpabuf * wpabuf_concat(struct wpabuf *a, struct wpabuf *b);
- /**
- * wpabuf_size - Get the currently allocated size of a wpabuf buffer
- * @buf: wpabuf buffer
- * Returns: Currently allocated size of the buffer
- */
- static inline size_t wpabuf_size(const struct wpabuf *buf)
- {
- return buf->size;
- }
- /**
- * wpabuf_len - Get the current length of a wpabuf buffer data
- * @buf: wpabuf buffer
- * Returns: Currently used length of the buffer
- */
- static inline size_t wpabuf_len(const struct wpabuf *buf)
- {
- return buf->used;
- }
- /**
- * wpabuf_tailroom - Get size of available tail room in the end of the buffer
- * @buf: wpabuf buffer
- * Returns: Tail room (in bytes) of available space in the end of the buffer
- */
- static inline size_t wpabuf_tailroom(const struct wpabuf *buf)
- {
- return buf->size - buf->used;
- }
- /**
- * wpabuf_head - Get pointer to the head of the buffer data
- * @buf: wpabuf buffer
- * Returns: Pointer to the head of the buffer data
- */
- static inline const void * wpabuf_head(const struct wpabuf *buf)
- {
- if (buf->ext_data)
- return buf->ext_data;
- return buf + 1;
- }
- static inline const u8 * wpabuf_head_u8(const struct wpabuf *buf)
- {
- return wpabuf_head(buf);
- }
- /**
- * wpabuf_mhead - Get modifiable pointer to the head of the buffer data
- * @buf: wpabuf buffer
- * Returns: Pointer to the head of the buffer data
- */
- static inline void * wpabuf_mhead(struct wpabuf *buf)
- {
- if (buf->ext_data)
- return buf->ext_data;
- return buf + 1;
- }
- static inline u8 * wpabuf_mhead_u8(struct wpabuf *buf)
- {
- return wpabuf_mhead(buf);
- }
- static inline void wpabuf_put_u8(struct wpabuf *buf, u8 data)
- {
- u8 *pos = wpabuf_put(buf, 1);
- *pos = data;
- }
- static inline void wpabuf_put_be16(struct wpabuf *buf, u16 data)
- {
- u8 *pos = wpabuf_put(buf, 2);
- WPA_PUT_BE16(pos, data);
- }
- static inline void wpabuf_put_be24(struct wpabuf *buf, u32 data)
- {
- u8 *pos = wpabuf_put(buf, 3);
- WPA_PUT_BE24(pos, data);
- }
- static inline void wpabuf_put_be32(struct wpabuf *buf, u32 data)
- {
- u8 *pos = wpabuf_put(buf, 4);
- WPA_PUT_BE32(pos, data);
- }
- static inline void wpabuf_put_data(struct wpabuf *buf, const void *data,
- size_t len)
- {
- if (data)
- os_memcpy(wpabuf_put(buf, len), data, len);
- }
- static inline void wpabuf_put_buf(struct wpabuf *dst,
- const struct wpabuf *src)
- {
- wpabuf_put_data(dst, wpabuf_head(src), wpabuf_len(src));
- }
- static inline void wpabuf_set(struct wpabuf *buf, const void *data, size_t len)
- {
- buf->ext_data = (u8 *) data;
- buf->size = buf->used = len;
- }
- #endif /* WPABUF_H */
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