| #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 */ |