/[lwip]/lwip/src/core/pbuf-rom.c
ViewVC logotype

Contents of /lwip/src/core/pbuf-rom.c

Parent Directory Parent Directory | Revision Log Revision Log


Revision 1.1.2.2 - (show annotations) (download)
Thu Mar 18 04:51:56 2004 UTC (20 years, 1 month ago) by lukem
Branch: lukem-pbuf
Changes since 1.1.2.1: +4 -2 lines
File MIME type: text/plain
Removed an invalid assertion, added some comments to explain behaviour.

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-rom.h"
35 #include "lwip/mem.h"
36
37 struct pbuf_manager pbuf_rom_manager = {pbuf_rom_alloc,
38 pbuf_rom_realloc,
39 pbuf_rom_free,
40 pbuf_rom_header};
41
42 void
43 pbuf_rom_init(void){
44 return;
45 }
46
47 struct pbuf *
48 pbuf_rom_alloc(u16_t offset, u16_t size, struct pbuf_manager *mgr, void *src){
49 struct pbuf_rom *p;
50
51 p = mem_malloc(MEM_ALIGN_SIZE(sizeof(struct pbuf_rom)));
52 if (p == NULL) {
53 return NULL;
54 }
55
56 p->next = NULL;
57 p->payload = src;
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_ROM_MAGIC;
64 #endif
65
66 return (struct pbuf*)p;
67 }
68
69 void
70 pbuf_rom_realloc(struct pbuf *p, u16_t size){
71 /* Can't realloc a rom pbuf, so we just return. This is ok because
72 * pbuf_realloc only ever calls us to shrink the pbuf.
73 */
74 return;
75 }
76
77 void
78 pbuf_rom_free(struct pbuf *p){
79 #ifdef LWIP_DEBUG
80 struct pbuf_rom *q = (struct pbuf_rom*)p;
81 LWIP_ASSERT("pbuf_rom_free(): pbuf was not a rom pbuf!",
82 (q->magic==PBUF_ROM_MAGIC));
83 #endif
84 mem_free(p);
85 }
86
87 u8_t
88 pbuf_rom_header(struct pbuf *p, s16_t header_size){
89 return 1; /* fail - you can't resize a rom pbuf */
90 }

savannah-hackers-public@gnu.org
ViewVC Help
Powered by ViewVC 1.1.26