92 lines
2.8 KiB
C
92 lines
2.8 KiB
C
/* $NetBSD: sir.h,v 1.8 2013/05/27 16:23:20 kiyohara Exp $ */
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/*
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* Copyright (c) 2001 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Lennart Augustsson (lennart@augustsson.net) and Tommy Bohlin
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* (tommy@gatespace.com).
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Framing originally written by Tommy Bohlin.
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*/
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/* Protocol constants */
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#define SIR_EXTRA_BOF 0xff
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#define SIR_BOF 0xc0
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#define SIR_CE 0x7d
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#define SIR_EOF 0xc1
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#define SIR_ESC_BIT 0x20
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enum framefsmstate {
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FSTATE_END_OF_FRAME,
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FSTATE_START_OF_FRAME,
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FSTATE_IN_DATA,
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FSTATE_IN_END
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};
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enum frameresult {
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FR_IDLE,
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FR_INPROGRESS,
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FR_FRAMEOK,
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FR_FRAMEBADFCS,
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FR_FRAMEMALFORMED,
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FR_BUFFEROVERRUN
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};
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struct framestate {
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u_int8_t *buffer;
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size_t buflen;
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size_t bufindex;
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enum framefsmstate fsmstate;
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u_int escaped;
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u_int state_index;
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};
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#define deframe_isclear(fs) ((fs)->fsmstate == FSTATE_END_OF_FRAME)
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int irda_sir_frame(u_int8_t *, u_int, struct uio *, u_int);
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void deframe_init(struct framestate *, u_int8_t *, size_t);
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void deframe_clear(struct framestate *);
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enum frameresult deframe_process(struct framestate *, u_int8_t const **,
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size_t *);
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/*
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* CRC computation
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*/
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#define INITFCS 0xffff
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#define GOODFCS 0xf0b8
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extern const u_int16_t irda_fcstab[];
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static __inline u_int16_t updateFCS(u_int16_t fcs, int c) {
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return (fcs >> 8) ^ irda_fcstab[(fcs^c) & 0xff];
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}
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u_int32_t crc_ccitt_16(u_int32_t, u_int8_t const*, size_t);
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