1 | /* $NetBSD: sir.h,v 1.8 2013/05/27 16:23:20 kiyohara Exp $ */ |
2 | |
3 | /* |
4 | * Copyright (c) 2001 The NetBSD Foundation, Inc. |
5 | * All rights reserved. |
6 | * |
7 | * This code is derived from software contributed to The NetBSD Foundation |
8 | * by Lennart Augustsson (lennart@augustsson.net) and Tommy Bohlin |
9 | * (tommy@gatespace.com). |
10 | * |
11 | * Redistribution and use in source and binary forms, with or without |
12 | * modification, are permitted provided that the following conditions |
13 | * are met: |
14 | * 1. Redistributions of source code must retain the above copyright |
15 | * notice, this list of conditions and the following disclaimer. |
16 | * 2. Redistributions in binary form must reproduce the above copyright |
17 | * notice, this list of conditions and the following disclaimer in the |
18 | * documentation and/or other materials provided with the distribution. |
19 | * |
20 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
21 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
22 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
23 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
24 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
25 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
26 | * 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) |
29 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
30 | * POSSIBILITY OF SUCH DAMAGE. |
31 | */ |
32 | |
33 | /* |
34 | * Framing originally written by Tommy Bohlin. |
35 | */ |
36 | |
37 | /* Protocol constants */ |
38 | #define 0xff |
39 | #define SIR_BOF 0xc0 |
40 | #define SIR_CE 0x7d |
41 | #define SIR_EOF 0xc1 |
42 | |
43 | #define SIR_ESC_BIT 0x20 |
44 | |
45 | enum framefsmstate { |
46 | FSTATE_END_OF_FRAME, |
47 | FSTATE_START_OF_FRAME, |
48 | FSTATE_IN_DATA, |
49 | FSTATE_IN_END |
50 | }; |
51 | |
52 | enum frameresult { |
53 | FR_IDLE, |
54 | FR_INPROGRESS, |
55 | FR_FRAMEOK, |
56 | FR_FRAMEBADFCS, |
57 | FR_FRAMEMALFORMED, |
58 | FR_BUFFEROVERRUN |
59 | }; |
60 | |
61 | struct framestate { |
62 | u_int8_t *buffer; |
63 | size_t buflen; |
64 | size_t bufindex; |
65 | |
66 | enum framefsmstate fsmstate; |
67 | u_int escaped; |
68 | u_int state_index; |
69 | }; |
70 | |
71 | #define deframe_isclear(fs) ((fs)->fsmstate == FSTATE_END_OF_FRAME) |
72 | |
73 | int irda_sir_frame(u_int8_t *, u_int, struct uio *, u_int); |
74 | void deframe_init(struct framestate *, u_int8_t *, size_t); |
75 | void deframe_clear(struct framestate *); |
76 | enum frameresult deframe_process(struct framestate *, u_int8_t const **, |
77 | size_t *); |
78 | |
79 | /* |
80 | * CRC computation |
81 | */ |
82 | #define INITFCS 0xffff |
83 | #define GOODFCS 0xf0b8 |
84 | |
85 | extern const u_int16_t irda_fcstab[]; |
86 | |
87 | static __inline u_int16_t updateFCS(u_int16_t fcs, int c) { |
88 | return (fcs >> 8) ^ irda_fcstab[(fcs^c) & 0xff]; |
89 | } |
90 | |
91 | u_int32_t crc_ccitt_16(u_int32_t, u_int8_t const*, size_t); |
92 | |