1 /******************************************************************************
2  *
3  *  Copyright (C) 2003-2012 Broadcom Corporation
4  *
5  *  Licensed under the Apache License, Version 2.0 (the "License");
6  *  you may not use this file except in compliance with the License.
7  *  You may obtain a copy of the License at:
8  *
9  *  http://www.apache.org/licenses/LICENSE-2.0
10  *
11  *  Unless required by applicable law or agreed to in writing, software
12  *  distributed under the License is distributed on an "AS IS" BASIS,
13  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  *  See the License for the specific language governing permissions and
15  *  limitations under the License.
16  *
17  ******************************************************************************/
18 
19 /******************************************************************************
20  *
21  *  This contains constants definitions and other information from the AVCTP
22  *  specification.  This file is intended for use internal to AVCT only.
23  *
24  ******************************************************************************/
25 #ifndef AVCT_DEFS_H
26 #define AVCT_DEFS_H
27 
28 /*****************************************************************************
29  * constants
30  ****************************************************************************/
31 
32 /* packet type */
33 #define AVCT_PKT_TYPE_SINGLE 0 /* single packet */
34 #define AVCT_PKT_TYPE_START 1  /* start packet */
35 #define AVCT_PKT_TYPE_CONT 2   /* continue packet */
36 #define AVCT_PKT_TYPE_END 3    /* end packet */
37 
38 /* header lengths for different packet types */
39 #define AVCT_HDR_LEN_SINGLE 3
40 #define AVCT_HDR_LEN_START 4
41 #define AVCT_HDR_LEN_CONT 1
42 #define AVCT_HDR_LEN_END 1
43 
44 /* invalid cr+ipid value */
45 #define AVCT_CR_IPID_INVALID 1
46 
47 /*****************************************************************************
48  * message parsing and building macros
49  ****************************************************************************/
50 
51 #define AVCT_BUILD_HDR(p, label, type, cr_ipid) \
52   *(p)++ = ((label) << 4) | ((type) << 2) | (cr_ipid);
53 
54 #define AVCT_PARSE_HDR(p, label, type, cr_ipid) \
55   do {                                          \
56     (label) = *(p) >> 4;                        \
57     (type) = (*(p) >> 2) & 3;                   \
58     (cr_ipid) = *(p)++ & 3;                     \
59   } while (0)
60 
61 #define AVCT_PKT_TYPE(p) ((*(p) >> 2) & 3)
62 
63 #endif /* AVCT_DEFS_H */
64