/* | |
* Copyright (c) 2001-2004 Swedish Institute of Computer Science. | |
* All rights reserved. | |
* | |
* Redistribution and use in source and binary forms, with or without modification, | |
* are permitted provided that the following conditions are met: | |
* | |
* 1. Redistributions of source code must retain the above copyright notice, | |
* this list of conditions and the following disclaimer. | |
* 2. Redistributions in binary form must reproduce the above copyright notice, | |
* this list of conditions and the following disclaimer in the documentation | |
* and/or other materials provided with the distribution. | |
* 3. The name of the author may not be used to endorse or promote products | |
* derived from this software without specific prior written permission. | |
* | |
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED | |
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT | |
* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT | |
* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING | |
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY | |
* OF SUCH DAMAGE. | |
* | |
* This file is part of the lwIP TCP/IP stack. | |
* | |
* Author: Adam Dunkels <adam@sics.se> | |
* | |
*/ | |
#ifndef __LWIP_PBUF_H__ | |
#define __LWIP_PBUF_H__ | |
#include "arch/cc.h" | |
#define PBUF_TRANSPORT_HLEN 20 | |
#define PBUF_IP_HLEN 20 | |
typedef enum { | |
PBUF_TRANSPORT, | |
PBUF_IP, | |
PBUF_LINK, | |
PBUF_RAW | |
} pbuf_layer; | |
typedef enum { | |
PBUF_RAM, | |
PBUF_ROM, | |
PBUF_REF, | |
PBUF_POOL | |
} pbuf_flag; | |
/* Definitions for the pbuf flag field. These are NOT the flags that | |
* are passed to pbuf_alloc(). */ | |
#define PBUF_FLAG_RAM 0x00U /* Flags that pbuf data is stored in RAM */ | |
#define PBUF_FLAG_ROM 0x01U /* Flags that pbuf data is stored in ROM */ | |
#define PBUF_FLAG_POOL 0x02U /* Flags that the pbuf comes from the pbuf pool */ | |
#define PBUF_FLAG_REF 0x04U /* Flags thet the pbuf payload refers to RAM */ | |
/** indicates this packet was broadcast on the link */ | |
#define PBUF_FLAG_LINK_BROADCAST 0x80U | |
struct pbuf { | |
/** next pbuf in singly linked pbuf chain */ | |
struct pbuf *next; | |
/** pointer to the actual data in the buffer */ | |
void *payload; | |
/** | |
* total length of this buffer and all next buffers in chain | |
* belonging to the same packet. | |
* | |
* For non-queue packet chains this is the invariant: | |
* p->tot_len == p->len + (p->next? p->next->tot_len: 0) | |
*/ | |
u16_t tot_len; | |
/** length of this buffer */ | |
u16_t len; | |
/** flags telling the type of pbuf, see PBUF_FLAG_ */ | |
u16_t flags; | |
/** | |
* the reference count always equals the number of pointers | |
* that refer to this pbuf. This can be pointers from an application, | |
* the stack itself, or pbuf->next pointers from a chain. | |
*/ | |
u16_t ref; | |
}; | |
void pbuf_init(void); | |
struct pbuf *pbuf_alloc(pbuf_layer l, u16_t size, pbuf_flag flag); | |
void pbuf_realloc(struct pbuf *p, u16_t size); | |
u8_t pbuf_header(struct pbuf *p, s16_t header_size); | |
void pbuf_ref(struct pbuf *p); | |
void pbuf_ref_chain(struct pbuf *p); | |
u8_t pbuf_free(struct pbuf *p); | |
u8_t pbuf_clen(struct pbuf *p); | |
void pbuf_cat(struct pbuf *h, struct pbuf *t); | |
void pbuf_chain(struct pbuf *h, struct pbuf *t); | |
struct pbuf *pbuf_take(struct pbuf *f); | |
struct pbuf *pbuf_dechain(struct pbuf *p); | |
void pbuf_queue(struct pbuf *p, struct pbuf *n); | |
struct pbuf * pbuf_dequeue(struct pbuf *p); | |
#endif /* __LWIP_PBUF_H__ */ |