wpabuf.h

/*
 * Dynamic data buffer
 * Copyright (c) 2007-2012, Jouni Malinen <j@w1.fi>
 *
 * This software may be distributed under the terms of the BSD license.
 * See README for more details.
 */

#ifndef WPABUF_H
#define WPABUF_H

/* wpabuf::buf is a pointer to external data */
#define WPABUF_FLAG_EXT_DATA BIT(0)

/*
 * 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 *buf; /* pointer to the head of the buffer */
    unsigned int flags;
    /* 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_clear_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);
struct wpabuf * wpabuf_parse_bin(const char *buf);


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)
{
    return buf->buf;
}

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)
{
    return buf->buf;
}

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_le32(struct wpabuf *buf, u32 data)
{
    u8 *pos = (u8 *) wpabuf_put(buf, 4);
    WPA_PUT_LE32(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->buf = (u8 *) data;
    buf->flags = WPABUF_FLAG_EXT_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 */