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1 office 1 /**
2 * @file
3 * SNMP pbuf stream wrapper (internal API, do not use in client code).
4 */
5  
6 /*
7 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
8 * All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without modification,
11 * are permitted provided that the following conditions are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright notice,
14 * this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright notice,
16 * this list of conditions and the following disclaimer in the documentation
17 * and/or other materials provided with the distribution.
18 * 3. The name of the author may not be used to endorse or promote products
19 * derived from this software without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
22 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
23 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
24 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
25 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
26 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
29 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
30 * OF SUCH DAMAGE.
31 *
32 * This file is part of the lwIP TCP/IP stack.
33 *
34 * Author: Martin Hentschel <info@cl-soft.de>
35 *
36 */
37  
38 #ifndef LWIP_HDR_APPS_SNMP_PBUF_STREAM_H
39 #define LWIP_HDR_APPS_SNMP_PBUF_STREAM_H
40  
41 #include "lwip/apps/snmp_opts.h"
42  
43 #if LWIP_SNMP
44  
45 #include "lwip/err.h"
46 #include "lwip/pbuf.h"
47  
48 #ifdef __cplusplus
49 extern "C" {
50 #endif
51  
52 struct snmp_pbuf_stream {
53 struct pbuf *pbuf;
54 u16_t offset;
55 u16_t length;
56 };
57  
58 err_t snmp_pbuf_stream_init(struct snmp_pbuf_stream *pbuf_stream, struct pbuf *p, u16_t offset, u16_t length);
59 err_t snmp_pbuf_stream_read(struct snmp_pbuf_stream *pbuf_stream, u8_t *data);
60 err_t snmp_pbuf_stream_write(struct snmp_pbuf_stream *pbuf_stream, u8_t data);
61 err_t snmp_pbuf_stream_writebuf(struct snmp_pbuf_stream *pbuf_stream, const void *buf, u16_t buf_len);
62 err_t snmp_pbuf_stream_writeto(struct snmp_pbuf_stream *pbuf_stream, struct snmp_pbuf_stream *target_pbuf_stream, u16_t len);
63 err_t snmp_pbuf_stream_seek(struct snmp_pbuf_stream *pbuf_stream, s32_t offset);
64 err_t snmp_pbuf_stream_seek_abs(struct snmp_pbuf_stream *pbuf_stream, u32_t offset);
65  
66 #ifdef __cplusplus
67 }
68 #endif
69  
70 #endif /* LWIP_SNMP */
71  
72 #endif /* LWIP_HDR_APPS_SNMP_PBUF_STREAM_H */