| 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 | |