/[lwip]/lwip/src/core/pbuf-ram.c
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Contents of /lwip/src/core/pbuf-ram.c

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Revision 1.1.2.1 - (show annotations) (download)
Tue Feb 24 02:46:27 2004 UTC (20 years, 2 months ago) by lukem
Branch: lukem-pbuf
Changes since 1.1: +108 -0 lines
File MIME type: text/plain
initial checkin of new pbuf code; added new files for ram and rom pbufs.
still need to implement ext and pool pbuf types.

1 /*
2 * Copyright (c) 2003 Luke Macpherson.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without modification,
6 * are permitted provided that the following conditions are met:
7 *
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.
15 *
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
25 * OF SUCH DAMAGE.
26 *
27 * This file is part of the lwIP TCP/IP stack.
28 *
29 * Author: Luke Macpherson <lukem@cse.unsw.edu.au>
30 *
31 */
32
33 #include "lwip/pbuf.h"
34 #include "lwip/pbuf-ram.h"
35 #include "lwip/mem.h"
36
37 struct pbuf_manager pbuf_ram_manager = {pbuf_ram_alloc,
38 pbuf_ram_realloc,
39 pbuf_ram_free,
40 pbuf_ram_header};
41
42 void
43 pbuf_ram_init(void){
44 return;
45 }
46
47 struct pbuf *
48 pbuf_ram_alloc(u16_t offset, u16_t size, struct pbuf_manager *mgr, void *src){
49 struct pbuf_ram *p;
50
51 p = mem_malloc(MEM_ALIGN_SIZE(sizeof(struct pbuf_ram) + offset + size));
52 if (p == NULL) {
53 return NULL;
54 }
55
56 p->next = NULL;
57 p->payload = MEM_ALIGN((void*)((u8_t*)p + sizeof(struct pbuf) + offset));
58 p->manager = mgr;
59 p->tot_len = size;
60 p->len = size;
61 p->ref = 1;
62 #ifdef LWIP_DEBUG
63 p->magic = PBUF_RAM_MAGIC;
64 #endif
65
66 /* if source data is specified, copy it to the payload */
67 if(src!=NULL && size>0){
68 memcpy(p->payload, src, size);
69 }
70
71 return (struct pbuf*)p;
72 }
73
74 void
75 pbuf_ram_realloc(struct pbuf *p, u16_t size){
76 mem_realloc(p, ((u8_t*)p->payload - (u8_t*)p) + size);
77 return;
78 }
79
80 void
81 pbuf_ram_free(struct pbuf *p){
82 #ifdef LWIP_DEBUG
83 struct pbuf_ram *q = (struct pbuf_ram*)p;
84 LWIP_ASSERT("pbuf_ram_free(): pbuf was not a ram pbuf!",
85 (q->magic==PBUF_RAM_MAGIC));
86 #endif
87 mem_free(p);
88 }
89
90 u8_t
91 pbuf_ram_header(struct pbuf *p, s16_t header_size){
92 mem_ptr_t min, payload;
93
94 LWIP_DEBUGF(PBUF_DEBUG, ("pbuf_ram_header(0x%p,%d) was called.\n",
95 p, (int)header_size));
96
97 min = (mem_ptr_t)p + sizeof(struct pbuf_ram);
98 payload = (mem_ptr_t)p->payload;
99
100 if(payload - header_size >= min){
101 p->payload = (u8_t*)p->payload - header_size;
102 p->len += header_size;
103 p->tot_len += header_size;
104 return 0; /* success */
105 }
106
107 return 1; /* failure */
108 }

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