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/*
* Dynamic data buffer
* Copyright (c) 2007-2009, 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);
struct wpabuf * wpabuf_zeropad(struct wpabuf *buf, size_t len);
void wpabuf_printf(struct wpabuf *buf, char *fmt, ...) PRINTF_FORMAT(2, 3);
/**
* 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_le16(struct wpabuf *buf, u16 data)
{
u8 *pos = wpabuf_put(buf, 2);
WPA_PUT_LE16(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;
}
static inline void wpabuf_put_str(struct wpabuf *dst, const char *str)
{
wpabuf_put_data(dst, str, os_strlen(str));
}
#endif /* WPABUF_H */
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