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Core/lwIP/include/lwip/pbuf.h@0:6dee052a3fa4, 2011-07-26 (annotated)

Committer:: nandgate
Date:: Tue Jul 26 05:30:53 2011 +0000
Revision:: 0:6dee052a3fa4

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User	Revision	Line number	New contents of line
nandgate	0:6dee052a3fa4	1	/*
nandgate	0:6dee052a3fa4	2	* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
nandgate	0:6dee052a3fa4	3	* All rights reserved.
nandgate	0:6dee052a3fa4	4	*
nandgate	0:6dee052a3fa4	5	* Redistribution and use in source and binary forms, with or without modification,
nandgate	0:6dee052a3fa4	6	* are permitted provided that the following conditions are met:
nandgate	0:6dee052a3fa4	7	*
nandgate	0:6dee052a3fa4	8	* 1. Redistributions of source code must retain the above copyright notice,
nandgate	0:6dee052a3fa4	9	* this list of conditions and the following disclaimer.
nandgate	0:6dee052a3fa4	10	* 2. Redistributions in binary form must reproduce the above copyright notice,
nandgate	0:6dee052a3fa4	11	* this list of conditions and the following disclaimer in the documentation
nandgate	0:6dee052a3fa4	12	* and/or other materials provided with the distribution.
nandgate	0:6dee052a3fa4	13	* 3. The name of the author may not be used to endorse or promote products
nandgate	0:6dee052a3fa4	14	* derived from this software without specific prior written permission.
nandgate	0:6dee052a3fa4	15	*
nandgate	0:6dee052a3fa4	16	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
nandgate	0:6dee052a3fa4	17	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
nandgate	0:6dee052a3fa4	18	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
nandgate	0:6dee052a3fa4	19	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
nandgate	0:6dee052a3fa4	20	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
nandgate	0:6dee052a3fa4	21	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
nandgate	0:6dee052a3fa4	22	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
nandgate	0:6dee052a3fa4	23	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
nandgate	0:6dee052a3fa4	24	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
nandgate	0:6dee052a3fa4	25	* OF SUCH DAMAGE.
nandgate	0:6dee052a3fa4	26	*
nandgate	0:6dee052a3fa4	27	* This file is part of the lwIP TCP/IP stack.
nandgate	0:6dee052a3fa4	28	*
nandgate	0:6dee052a3fa4	29	* Author: Adam Dunkels <adam@sics.se>
nandgate	0:6dee052a3fa4	30	*
nandgate	0:6dee052a3fa4	31	*/
nandgate	0:6dee052a3fa4	32
nandgate	0:6dee052a3fa4	33	#ifndef __LWIP_PBUF_H__
nandgate	0:6dee052a3fa4	34	#define __LWIP_PBUF_H__
nandgate	0:6dee052a3fa4	35
nandgate	0:6dee052a3fa4	36	#include "lwip/opt.h"
nandgate	0:6dee052a3fa4	37	#include "lwip/err.h"
nandgate	0:6dee052a3fa4	38
nandgate	0:6dee052a3fa4	39	#ifdef __cplusplus
nandgate	0:6dee052a3fa4	40	extern "C" {
nandgate	0:6dee052a3fa4	41	#endif
nandgate	0:6dee052a3fa4	42
nandgate	0:6dee052a3fa4	43	#define PBUF_TRANSPORT_HLEN 20
nandgate	0:6dee052a3fa4	44	#define PBUF_IP_HLEN 20
nandgate	0:6dee052a3fa4	45
nandgate	0:6dee052a3fa4	46	typedef enum {
nandgate	0:6dee052a3fa4	47	PBUF_TRANSPORT,
nandgate	0:6dee052a3fa4	48	PBUF_IP,
nandgate	0:6dee052a3fa4	49	PBUF_LINK,
nandgate	0:6dee052a3fa4	50	PBUF_RAW
nandgate	0:6dee052a3fa4	51	} pbuf_layer;
nandgate	0:6dee052a3fa4	52
nandgate	0:6dee052a3fa4	53	typedef enum {
nandgate	0:6dee052a3fa4	54	PBUF_RAM, /* pbuf data is stored in RAM */
nandgate	0:6dee052a3fa4	55	PBUF_ROM, /* pbuf data is stored in ROM */
nandgate	0:6dee052a3fa4	56	PBUF_REF, /* pbuf comes from the pbuf pool */
nandgate	0:6dee052a3fa4	57	PBUF_POOL /* pbuf payload refers to RAM */
nandgate	0:6dee052a3fa4	58	} pbuf_type;
nandgate	0:6dee052a3fa4	59
nandgate	0:6dee052a3fa4	60
nandgate	0:6dee052a3fa4	61	/** indicates this packet's data should be immediately passed to the application */
nandgate	0:6dee052a3fa4	62	#define PBUF_FLAG_PUSH 0x01U
nandgate	0:6dee052a3fa4	63
nandgate	0:6dee052a3fa4	64	struct pbuf {
nandgate	0:6dee052a3fa4	65	/** next pbuf in singly linked pbuf chain */
nandgate	0:6dee052a3fa4	66	struct pbuf *next;
nandgate	0:6dee052a3fa4	67
nandgate	0:6dee052a3fa4	68	/** pointer to the actual data in the buffer */
nandgate	0:6dee052a3fa4	69	void *payload;
nandgate	0:6dee052a3fa4	70
nandgate	0:6dee052a3fa4	71	/**
nandgate	0:6dee052a3fa4	72	* total length of this buffer and all next buffers in chain
nandgate	0:6dee052a3fa4	73	* belonging to the same packet.
nandgate	0:6dee052a3fa4	74	*
nandgate	0:6dee052a3fa4	75	* For non-queue packet chains this is the invariant:
nandgate	0:6dee052a3fa4	76	* p->tot_len == p->len + (p->next? p->next->tot_len: 0)
nandgate	0:6dee052a3fa4	77	*/
nandgate	0:6dee052a3fa4	78	u16_t tot_len;
nandgate	0:6dee052a3fa4	79
nandgate	0:6dee052a3fa4	80	/** length of this buffer */
nandgate	0:6dee052a3fa4	81	u16_t len;
nandgate	0:6dee052a3fa4	82
nandgate	0:6dee052a3fa4	83	/** pbuf_type as u8_t instead of enum to save space */
nandgate	0:6dee052a3fa4	84	u8_t /pbuf_type/ type;
nandgate	0:6dee052a3fa4	85
nandgate	0:6dee052a3fa4	86	/** misc flags */
nandgate	0:6dee052a3fa4	87	u8_t flags;
nandgate	0:6dee052a3fa4	88
nandgate	0:6dee052a3fa4	89	/**
nandgate	0:6dee052a3fa4	90	* the reference count always equals the number of pointers
nandgate	0:6dee052a3fa4	91	* that refer to this pbuf. This can be pointers from an application,
nandgate	0:6dee052a3fa4	92	* the stack itself, or pbuf->next pointers from a chain.
nandgate	0:6dee052a3fa4	93	*/
nandgate	0:6dee052a3fa4	94	u16_t ref;
nandgate	0:6dee052a3fa4	95
nandgate	0:6dee052a3fa4	96	};
nandgate	0:6dee052a3fa4	97
nandgate	0:6dee052a3fa4	98	/* Initializes the pbuf module. This call is empty for now, but may not be in future. */
nandgate	0:6dee052a3fa4	99	#define pbuf_init()
nandgate	0:6dee052a3fa4	100
nandgate	0:6dee052a3fa4	101	struct pbuf *pbuf_alloc(pbuf_layer l, u16_t size, pbuf_type type);
nandgate	0:6dee052a3fa4	102	void pbuf_realloc(struct pbuf *p, u16_t size);
nandgate	0:6dee052a3fa4	103	u8_t pbuf_header(struct pbuf *p, s16_t header_size);
nandgate	0:6dee052a3fa4	104	void pbuf_ref(struct pbuf *p);
nandgate	0:6dee052a3fa4	105	void pbuf_ref_chain(struct pbuf *p);
nandgate	0:6dee052a3fa4	106	u8_t pbuf_free(struct pbuf *p);
nandgate	0:6dee052a3fa4	107	u8_t pbuf_clen(struct pbuf *p);
nandgate	0:6dee052a3fa4	108	void pbuf_cat(struct pbuf head, struct pbuf tail);
nandgate	0:6dee052a3fa4	109	void pbuf_chain(struct pbuf head, struct pbuf tail);
nandgate	0:6dee052a3fa4	110	struct pbuf pbuf_dechain(struct pbuf p);
nandgate	0:6dee052a3fa4	111	err_t pbuf_copy(struct pbuf p_to, struct pbuf p_from);
nandgate	0:6dee052a3fa4	112	u16_t pbuf_copy_partial(struct pbuf p, void dataptr, u16_t len, u16_t offset);
nandgate	0:6dee052a3fa4	113	err_t pbuf_take(struct pbuf buf, const void dataptr, u16_t len);
nandgate	0:6dee052a3fa4	114	struct pbuf pbuf_coalesce(struct pbuf p, pbuf_layer layer);
nandgate	0:6dee052a3fa4	115
nandgate	0:6dee052a3fa4	116	#ifdef __cplusplus
nandgate	0:6dee052a3fa4	117	}
nandgate	0:6dee052a3fa4	118	#endif
nandgate	0:6dee052a3fa4	119
nandgate	0:6dee052a3fa4	120	#endif /* __LWIP_PBUF_H__ */

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	26 Jul 2011
Imports:	159
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	2
Followers:	9

Core/lwIP/include/lwip/pbuf.h@0:6dee052a3fa4, 2011-07-26 (annotated)

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