wpabuf.c File Reference

Dynamic data buffer. More...

#include "includes.h"
#include "common.h"
#include "trace.h"
#include "wpabuf.h"

Functions
int	wpabuf_resize (struct wpabuf **_buf, size_t add_len)
struct wpabuf *	wpabuf_alloc (size_t len)
	Allocate a wpabuf of the given size.
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)
	Free a wpabuf.
void *	wpabuf_put (struct wpabuf *buf, size_t len)
struct wpabuf *	wpabuf_concat (struct wpabuf *a, struct wpabuf *b)
	Concatenate two buffers into a newly allocated one.
struct wpabuf *	wpabuf_zeropad (struct wpabuf *buf, size_t len)
	Pad buffer with 0x00 octets (prefix) to specified length.
void	wpabuf_printf (struct wpabuf *buf, char *fmt,...)

---

Detailed Description

Dynamic data buffer.

Copyright

Copyright (c) 2007-2009, Jouni Malinen <j@w1.fi>

This software may be distributed under the terms of the BSD license. See README for more details.

---

Function Documentation

struct wpabuf* wpabuf_alloc

(

size_t

len

)

[read]

Allocate a wpabuf of the given size.

Parameters:

len	Length for the allocated buffer

Returns:

Buffer to the allocated wpabuf or NULL on failure

struct wpabuf* wpabuf_concat	(	struct wpabuf *	a,
		struct wpabuf *	b
	)		[read]

Concatenate two buffers into a newly allocated one.

Parameters:

a	First buffer
b	Second buffer

Returns:

wpabuf with concatenated a + b data or NULL on failure

Both buffers a and b will be freed regardless of the return value. Input buffers can be NULL which is interpreted as an empty buffer.

void wpabuf_free

(

struct wpabuf *

buf

)

Free a wpabuf.

Parameters:

buf	wpabuf buffer

struct wpabuf* wpabuf_zeropad	(	struct wpabuf *	buf,
		size_t	len
	)		[read]

Pad buffer with 0x00 octets (prefix) to specified length.

Parameters:

buf	Buffer to be padded
len	Length for the padded buffer

Returns:

wpabuf padded to len octets or NULL on failure

If buf is longer than len octets or of same size, it will be returned as-is. Otherwise a new buffer is allocated and prefixed with 0x00 octets followed by the source data. The source buffer will be freed on error, i.e., caller will only be responsible on freeing the returned buffer. If buf is NULL, NULL will be returned.