75 lines
1.9 KiB
C
75 lines
1.9 KiB
C
#ifndef _MSGB_H
|
|
#define _MSGB_H
|
|
|
|
/* (C) 2008 by Harald Welte <laforge@gnumonks.org>
|
|
* All Rights Reserved
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along
|
|
* with this program; if not, write to the Free Software Foundation, Inc.,
|
|
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*
|
|
*/
|
|
|
|
struct bts_link;
|
|
|
|
struct msgb {
|
|
/* ptr to the incoming (RX) or outgoing (TX) BTS link */
|
|
struct gsm_bts_link *bts_link;
|
|
|
|
u_int8_t l2_off;
|
|
u_int8_t l3_off;
|
|
|
|
u_int16_t data_len;
|
|
u_int16_t len;
|
|
|
|
unsigned char *head;
|
|
unsigned char *tail;
|
|
unsigned char *data;
|
|
unsigned char _data[0];
|
|
};
|
|
|
|
extern struct msgb *msgb_alloc(u_int16_t size);
|
|
extern void msgb_free(struct msgb *m);
|
|
|
|
#define msgb_l2(m) ((void *)(m->data + m->l2_off))
|
|
#define msgb_l3(m) ((void *)(m->data + m->l3_off))
|
|
|
|
static inline unsigned int msgb_headlen(const struct msgb *msgb)
|
|
{
|
|
return msgb->len - msgb->data_len;
|
|
}
|
|
static inline unsigned char *msgb_put(struct msgb *msgb, unsigned int len)
|
|
{
|
|
unsigned char *tmp = msgb->tail;
|
|
msgb->tail += len;
|
|
msgb->len += len;
|
|
return tmp;
|
|
}
|
|
static inline unsigned char *msgb_push(struct msgb *msgb, unsigned int len)
|
|
{
|
|
msgb->data -= len;
|
|
msgb->len += len;
|
|
return msgb->data;
|
|
}
|
|
static inline unsigned char *msgb_pull(struct msgb *msgb, unsigned int len)
|
|
{
|
|
msgb->len -= len;
|
|
return msgb->data += len;
|
|
}
|
|
static inline int msgb_tailroom(const struct msgb *msgb)
|
|
{
|
|
return (msgb->data + msgb->data_len) - msgb->tail;
|
|
}
|
|
|
|
#endif /* _MSGB_H */
|