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 SIR_EXTRA_BOF 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