wpabuf.h

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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);


static inline size_t wpabuf_size(const struct wpabuf *buf)
{
        return buf->size;
}

static inline size_t wpabuf_len(const struct wpabuf *buf)
{
        return buf->used;
}

static inline size_t wpabuf_tailroom(const struct wpabuf *buf)
{
        return buf->size - buf->used;
}

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 (const u8 *) wpabuf_head(buf);
}

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 (u8 *) wpabuf_mhead(buf);
}

static inline void wpabuf_put_u8(struct wpabuf *buf, u8 data)
{
        u8 *pos = (u8 *) wpabuf_put(buf, 1);
        *pos = data;
}

static inline void wpabuf_put_le16(struct wpabuf *buf, u16 data)
{
        u8 *pos = (u8 *) wpabuf_put(buf, 2);
        WPA_PUT_LE16(pos, data);
}

static inline void wpabuf_put_be16(struct wpabuf *buf, u16 data)
{
        u8 *pos = (u8 *) wpabuf_put(buf, 2);
        WPA_PUT_BE16(pos, data);
}

static inline void wpabuf_put_be24(struct wpabuf *buf, u32 data)
{
        u8 *pos = (u8 *) wpabuf_put(buf, 3);
        WPA_PUT_BE24(pos, data);
}

static inline void wpabuf_put_be32(struct wpabuf *buf, u32 data)
{
        u8 *pos = (u8 *) 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 */