| #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. |
| * |
| */ |
| |
| #include <openbsc/linuxlist.h> |
| |
| struct bts_link; |
| |
| struct msgb { |
| struct llist_head list; |
| |
| /* ptr to the physical E1 link to the BTS(s) */ |
| struct gsm_bts_link *bts_link; |
| |
| /* Part of which TRX logical channel we were received / transmitted */ |
| struct gsm_bts_trx *trx; |
| struct gsm_lchan *lchan; |
| |
| unsigned char *l2h; |
| unsigned char *l3h; |
| unsigned char *smsh; |
| |
| 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); |
| extern void msgb_enqueue(struct llist_head *queue, struct msgb *msg); |
| extern struct msgb *msgb_dequeue(struct llist_head *queue); |
| |
| #define msgb_l2(m) ((void *)(m->l2h)) |
| #define msgb_l3(m) ((void *)(m->l3h)) |
| #define msgb_sms(m) ((void *)(m->smsh)) |
| |
| static inline unsigned int msgb_l3len(const struct msgb *msgb) |
| { |
| return msgb->tail - (u_int8_t *)msgb_l3(msgb); |
| } |
| |
| 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; |
| } |
| |
| /* increase the headroom of an empty msgb, reducing the tailroom */ |
| static inline void msgb_reserve(struct msgb *msg, int len) |
| { |
| msg->data += len; |
| msg->tail += len; |
| } |
| |
| static inline struct msgb *msgb_alloc_headroom(int size, int headroom) |
| { |
| struct msgb *msg = msgb_alloc(size); |
| if (msg) |
| msgb_reserve(msg, headroom); |
| return msg; |
| } |
| |
| #endif /* _MSGB_H */ |