/* * isdnhdlc.h -- General purpose ISDN HDLC decoder. * * Implementation of a HDLC decoder/encoder in software. * Neccessary because some ISDN devices don't have HDLC * controllers. Also included: a bit reversal table. * *Copyright (C) 2002 Wolfgang M�es <wolfgang@iksw-muees.de> * 2001 Frode Isaksen <fisaksen@bewan.com> * 2001 Kai Germaschewski <kai.germaschewski@gmx.de> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #ifndef __ISDNHDLC_H__ #define __ISDNHDLC_H__ struct isdnhdlc_vars { int bit_shift; int hdlc_bits1; int data_bits; int ffbit_shift; // encoding only int state; int dstpos; unsigned short crc; unsigned char cbin; unsigned char shift_reg; unsigned char ffvalue; int data_received:1; // set if transferring data int dchannel:1; // set if D channel (send idle instead of flags) int do_adapt56:1; // set if 56K adaptation int do_closing:1; // set if in closing phase (need to send CRC + flag }; /* The return value from isdnhdlc_decode is the frame length, 0 if no complete frame was decoded, or a negative error number */ #define HDLC_FRAMING_ERROR 1 #define HDLC_CRC_ERROR 2 #define HDLC_LENGTH_ERROR 3 extern const unsigned char isdnhdlc_bit_rev_tab[256]; extern void isdnhdlc_rcv_init (struct isdnhdlc_vars *hdlc, int do_adapt56); extern int isdnhdlc_decode (struct isdnhdlc_vars *hdlc, const unsigned char *src, int slen,int *count, unsigned char *dst, int dsize); extern void isdnhdlc_out_init (struct isdnhdlc_vars *hdlc,int is_d_channel,int do_adapt56); extern int isdnhdlc_encode (struct isdnhdlc_vars *hdlc,const unsigned char *src,unsigned short slen,int *count, unsigned char *dst,int dsize); #endif /* __ISDNHDLC_H__ */