2 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
5 * Redistribution and use in source and binary forms, with or without modification,
6 * are permitted provided that the following conditions are met:
8 * 1. Redistributions of source code must retain the above copyright notice,
9 * this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright notice,
11 * this list of conditions and the following disclaimer in the documentation
12 * and/or other materials provided with the distribution.
13 * 3. The name of the author may not be used to endorse or promote products
14 * derived from this software without specific prior written permission.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
19 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
20 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
21 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
24 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
27 * This file is part of the lwIP TCP/IP stack.
29 * Author: Adam Dunkels <adam@sics.se>
33 #ifndef __LWIP_PBUF_H__
34 #define __LWIP_PBUF_H__
43 #define PBUF_TRANSPORT_HLEN 20
44 #define PBUF_IP_HLEN 20
60 /* Definitions for the pbuf flag field. These are NOT the flags that
61 * are passed to pbuf_alloc(). */
62 #define PBUF_TYPE_RAM 0x00U /* pbuf data is stored in RAM */
63 #define PBUF_TYPE_ROM 0x01U /* pbuf data is stored in ROM */
64 #define PBUF_TYPE_POOL 0x02U /* pbuf comes from the pbuf pool */
65 #define PBUF_TYPE_REF 0x04U /* pbuf payload refers to RAM */
67 /** indicates this packet's data should be immediately passed to the application */
68 #define PBUF_FLAG_PUSH 0x40U
69 /** indicates this packet was broadcast on the link */
70 #define PBUF_FLAG_LINK_BROADCAST 0x80U
73 /** next pbuf in singly linked pbuf chain */
76 /** pointer to the actual data in the buffer */
80 * total length of this buffer and all next buffers in chain
81 * belonging to the same packet.
83 * For non-queue packet chains this is the invariant:
84 * p->tot_len == p->len + (p->next? p->next->tot_len: 0)
88 /** length of this buffer */
91 /** type of pbuf, see PBUF_TYPE_ */
98 * the reference count always equals the number of pointers
99 * that refer to this pbuf. This can be pointers from an application,
100 * the stack itself, or pbuf->next pointers from a chain.
106 /* Initializes the pbuf module. This call is empty for now, but may not be in future. */
109 struct pbuf *pbuf_alloc(pbuf_layer l, u16_t size, pbuf_flag flag);
110 void pbuf_realloc(struct pbuf *p, u16_t size);
111 u8_t pbuf_header(struct pbuf *p, s16_t header_size);
112 void pbuf_ref(struct pbuf *p);
113 void pbuf_ref_chain(struct pbuf *p);
114 u8_t pbuf_free(struct pbuf *p);
115 u8_t pbuf_clen(struct pbuf *p);
116 void pbuf_cat(struct pbuf *h, struct pbuf *t);
117 void pbuf_chain(struct pbuf *h, struct pbuf *t);
118 struct pbuf *pbuf_dechain(struct pbuf *p);
119 err_t pbuf_copy(struct pbuf *p_to, struct pbuf *p_from);
120 u16_t pbuf_copy_partial(struct pbuf *p, void *dataptr, u16_t len, u16_t offset);
126 #endif /* __LWIP_PBUF_H__ */