/*
**	$Id: IOSerial.cpp 1.6 1995/12/03 12:16:23 olsen Exp olsen $
**
**	:ts=4
*/

/*
 * Amiga changes copyright © 1995 by Olaf Barthel, All Rights Reserved
 *
 * Copyright (c) 1992, 1993 Arno Augustin, Frank Hoering, University of
 * Erlangen-Nuremberg, Germany.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      Erlangen-Nuremberg, Germany.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO
 * EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * This software has not been validated by the ``Bundesamt fuer Zulassungen in
 * der Telekommunikation'' of the ``Deutsche Bundepost Telekom'' and thus
 * must not be used for accessing the BTX-Network of the Telekom in Germany.
 *
 * Diese Software hat keine Zulassung durch das Bundesamt fuer Zulassungen in
 * der Telekommunikation der Deutschen Bundespost Telekom und darf daher nicht
 * am Netz der Deutschen Bundespost Telekom in Deutschland betrieben werden.
 */

/****************************************************************************/

#include <string.h>
#include <stdio.h>

/****************************************************************************/

#ifndef _IOSERIAL_HPP
#include "IOSerial.hpp"
#endif

#ifndef _CONTROL_H
#include "Control.h"
#endif

#ifndef _RAWKEYS_H
#include "RawKeys.h"
#endif

/****************************************************************************/

#define D(x)

/********************  This is CONTROL SET C0 of CEPT ***********************/

#define NOBLOCK    0	/* not receiving a block */
#define TEXTBLOCK  1	/* normal text block	 */
#define IMAGEBLOCK 2	/* transparent block	 */
#define ERROR	   0	/* status error 		 */

#define NUL 0x00		 /* Null					 (data link) */
#define SOH 0x01		 /* start of heading		 (data link) */
#define STX 0x02		 /* start text				 (data link) */
#define ETX 0x03		 /* end text				 (data link) */
#define EOT 0x04		 /* end of transmission 	 (data link) */
#define ENQ 0x05		 /* enquiry 				 (data link) */
#define ACK 0x06		 /* acknowledge 			 (data link) */
#define ITB 0x07		 /* end intermediate block	 (data link) */
#define APB 0x08		 /* active position back	 (control sequence) */
#define APF 0x09		 /* active position forward  (control sequence) */
#define APD 0x0a		 /* active position down	 (control sequence) */
#define APU 0x0b		 /* active position up		 (control sequence) */
#define CS	0x0c		 /* clear screen			 (control sequence) */
#define APR 0x0d		 /* active position return	 (control sequence) */
#define LS1 0x0e		 /* locking shift 1 		 (control sequence) */
#define LS0 0x0f		 /* locking shift 0 		 (control sequence) */
#define DLE 0x10		 /* data link escape		 (data link) */
#define CON 0x11		 /* cursor on				 (control sequence) */
#define RPT 0x12		 /* repeat last character	 (control sequence) */
#define INI 0x13		 /* initiator '*'			 (btx special) */
#define COF 0x14		 /* cursor off				 (control sequence) */
#define NAK 0x15		 /* negative acknowledge	 (data link) */
#define SYN 0x16		 /* 						 (data link) */
#define ETB 0x17		 /* end textblock			 (data link) */
#define CAN 0x18		 /* cancel,clear eol		 (control sequence) */
#define SS2 0x19		 /* single shift for G2 SET  (control sequence) */
#define DCT 0x1a		 /* 						 (btx special) */
#define ESC 0x1b		 /* escape					 (control sequence) */
#define TER 0x1c		 /* terminator '#'			 (btx special) */
#define SS3 0x1d		 /* single shift for G3 SET  (control sequence) */
#define APH 0x1e		 /* active position home	 (control sequence) */
#define US	0x1f		 /* active position (x,y)	 (control sequence) */

/****************************************************************************/

	// For crc 16 bit calculation using run-time generated table

#define calccrc(c)	crc=(UWORD)(crctab[((crc) ^ (c)) & 0xff] ^ ((crc) >> 8))

/****************************************************************************/

VOID IOSerial::Close(VOID)
{
	if(Raw)
	{
		delete Raw;

		Raw = NULL;
	}
}

LONG IOSerial::Open(CONST STRPTR Channel,ULONG Unit,ULONG Baud,BOOL RTS_CTS)
{
	LONG Error;

	Close();

	if(Raw = new IORawSerial)
	{
		if(Error = Raw->Open(Channel,Unit,Baud,RTS_CTS))
		{
			delete Raw;

			Raw = NULL;
		}
	}
	else
		Error = -1;

	return(Error);
}

VOID IOSerial::PutString(CONST STRPTR String,LONG Len)
{
	if(Raw)
	{
		UBYTE *From;
		UBYTE *s,*t;
		char *str;
		UBYTE c;

		if(Len < 0)
			Len = strlen(String);

		s = (UBYTE *)String;
		t = s + Len;

		From = s;

		str = NULL;
		c = 0;

		while(s < t)
		{
			switch(*s)
			{
				case 'Ä':

					str = "\310A";
					break;

				case 'ä':

					str = "\310a";
					break;

				case 'Ö':

					str = "\310O";
					break;

				case 'ö':

					str = "\310o";

				case 'Ü':

					str = "\0310U";
					break;

				case 'ü':

					str = "\310U";
					break;

				case KEY_CursorUp:

					c = APU;
					break;

				case KEY_CursorDown:

					c = APD;
					break;

				case '\b':
				case 127:
				case KEY_CursorLeft:

					c = APB;
					break;

				case KEY_CursorRight:

					c = APF;
					break;

				case KEY_Help:

					c = APH;
					break;

				case '*':

					c = INI;
					break;

				case '#':
				case '\r':
				case '\n':

					c = TER;
					break;
			}

			if(str || c)
			{
				if(From < s)
					Raw->PutString((CONST STRPTR)From,(LONG)(s - From));

				From = s + 1;

				if(str)
				{
					Raw->PutString((CONST STRPTR)str,strlen(str));
					str = NULL;
				}
				else
				{
					Raw->PutChar(c);
					c = 0;
				}
			}

			s++;
		}

		if(From < s)
			Raw->PutString((CONST STRPTR)From,(LONG)(s - From));
	}
}

/* modeminput: this is data link layer (level 2) for getting blocks from
 * btx, crc check is done and characters are send to client
 */

int IOSerial::modeminput(LONG Timeout)
{
	LONG c1;
	UBYTE c;
	BOOL eaten;

	if(buffered > 0 && buffer_input)
	{
		if(buffered-- == 1)
			buffer_input = FALSE;

		return((int)buffer[bufferindex++]);
	}

	for(;;)
	{
		c1 = getmodem(Timeout);

		if(c1 < 0)
			return(c1);
		else
			c = (UBYTE)c1;

		switch( block )
		{
			case IMAGEBLOCK:

				eaten = FALSE;

				switch(c)
				{
					case DLE:

						if(got_dle)
							got_dle = FALSE;
						else
						{
							got_dle = TRUE;

							eaten = TRUE;
						}

						break;

					case ENQ:

						if(got_dle)
						{
							buffered = bufferlen = 0;
							buffer_input = FALSE;
							ack01 = '0';
							block = NOBLOCK;
							got_itb_bcc = FALSE;

							putmodem(DLE);
							putmodem(ack01);

							eaten = TRUE;
							got_dle = FALSE;
						}

						break;

					case EOT:

						if(status == ERROR || got_dle)
						{
							buffered = bufferlen = 0;
							buffer_input = FALSE;
							ack01 = '0';
							block = NOBLOCK;
							got_itb_bcc = FALSE;

							eaten = TRUE;
							got_dle = FALSE;
						}

						break;

					case ITB:
					case ETB:
					case ETX:

						if(got_dle)
						{
							got_dle = FALSE;

							calccrc(c);

							eaten = TRUE;

							if(getcheck(Timeout) || status == ERROR)
							{
								buffered = bufferlen = 0;
								buffer_input = FALSE;
								crc = 0;
								putmodem(NAK);
								status = ERROR;

								got_itb_bcc = FALSE;
								got_dle = FALSE;

								break;
							}

							status = c;

							block = NOBLOCK;

							if(c == ITB)
							{
								putmodem(ACK);
								got_itb_bcc = TRUE;
							}
							else
							{
								ack01 ^= 1;
								putmodem(DLE);
								putmodem(ack01);
								got_itb_bcc = FALSE;
							}

							if(bufferlen > 0)
							{
								buffer_input = TRUE;
								buffered = bufferlen - 1;
								bufferindex = 1;

								bufferlen = 0;

								return((int)buffer[0]);
							}
						}

						break;
				}

				if(!eaten)
				{
					calccrc(c);

					if(bufferlen < BLOCK_BUFFER_SIZE-1)
					{
						buffer[bufferlen++] = c;
						got_itb_bcc = FALSE;
					}
					else
						D(printf("Blockbuffer overflow !\n"));
				}

				break;

			case TEXTBLOCK:

				calccrc(c);

				switch(c)
				{
					case DLE:
					case NAK:
					case ACK:
					case SOH:

						D(printf("Bad char:%x\n",c1));
						got_itb_bcc = FALSE;
						break;

					case STX:

						if(status == ERROR || status == ETB)
						{
							crc = 0;
							bufferlen = 0;
							status = EOT;
							got_itb_bcc = FALSE;
						}

						break;

					case EOT:

						ack01 = '0';
						block = NOBLOCK;
						got_itb_bcc = FALSE;
						break;

					case ITB:
					case ETB:
					case ETX:

						if(getcheck(Timeout) || status == ERROR)
						{
							buffer_input = FALSE;
							buffered = bufferlen = 0;
							crc = 0;
							putmodem(NAK);
							status = ERROR;
							got_itb_bcc = FALSE;

							break;
						}

						status = c;

						if(c == ITB)
						{
							putmodem(ACK);
							got_itb_bcc = TRUE;
						}
						else
						{
							ack01 ^= 1;
							putmodem(DLE);
							putmodem(ack01);

							if(c == ETX)
								block = NOBLOCK;  /* end of textblock */

							got_itb_bcc = FALSE;
						}

						if(bufferlen > 0)
						{
							buffer_input = TRUE;
							buffered = bufferlen - 1;
							bufferindex = 1;

							bufferlen = 0;

							return((int)buffer[0]);
						}

						break;

					case ENQ:

			 			switch( status )
						{
							case ERROR:
							case EOT:

								putmodem(NAK);
								break;

							case ITB:

								putmodem(ACK);
								putmodem(NAK);
								break;

							case ETX:
							case ETB:

								putmodem(DLE);
								putmodem(ack01);
								putmodem(NAK);
								break;
						}

						got_itb_bcc = FALSE;

						break;

					default:

						if(bufferlen < BLOCK_BUFFER_SIZE-1)
						{
							buffer[bufferlen++] = c;
							got_itb_bcc = FALSE;
						}
						else
							D(printf("Blockbuffer overflow !\n"));

						break;
				}

				break;

			default:	  /* NOBLOCK */

				status = EOT;

				if(tfi)
				{
					if(tfi == SOH)
						tfi = ENQ;
					else
					{
						if(c == ENQ)
						{
							D(printf("send TFI\n"));
							send_TFI();
						}

						tfi = 0;
					}
				}

				switch(c)
				{
					case DLE:

						got_dle = TRUE;
						break;

					case ENQ:

						if(got_dle)
						{
							putmodem(DLE);
							putmodem('0');
						}

						got_dle = FALSE;
						break;

					case EOT:

						ack01 = '0';
						got_dle = FALSE;
						break;

					case SOH:

						tfi = SOH;
						crc = 0;
						block = TEXTBLOCK;
						bufferlen = 0;
						got_dle = FALSE;
						break;

					case STX:

						if(got_dle)
							block = IMAGEBLOCK;
						else
							block = TEXTBLOCK;

						crc = 0;
						bufferlen = 0;

						if(got_dle && got_itb_bcc)
						{
							got_itb_bcc = FALSE;

							calccrc(DLE);
							calccrc(STX);
						}

						got_dle = FALSE;
						break;

					default:

						got_dle = FALSE;
						return((int)c);
				}

				break;
		}
	}
}

void IOSerial::send_TFI()
{
   putmodem(SOH);
   putmodem('@');  /* @ = intermediate blocksize */
   putmodem('5');  /* 5 = max. 256 bytes		 */
   putmodem(ETX);
}

/* get 2 bytes from modem and calccrc, return value is crc (should be 0 if
 * no crc error), during check handle socket inputs
 */
UWORD IOSerial::getcheck(LONG Timeout)
{
	LONG c;
	int i;

	for(i = 0 ; i < 2 ; )
	{
		c = getmodem(Timeout);

		if(c >= 0)
		{
			calccrc((unsigned int)c);
			i++;
		}
	}

	if(crc)
		D(printf("CRC error %x\n",(int)crc));

	return(crc);
}

/******************************************************************************/

IOSerial::IOSerial()
{
	UWORD crc;
	int i,j;

	Raw				= NULL;

	block			= NOBLOCK;
	bufferlen		= 0;
	tfi				= 0;
	ack01			= '0';
	status			= EOT;
	crc				= 0;
	buffered		= 0;
	buffer_input	= FALSE;

	got_dle			= FALSE;
	got_itb_bcc		= FALSE;

	for(i = 0 ; i < 256 ; i++)
	{
		crc = (UWORD)i;

		for(j = 0 ; j < 8 ; j++)
		{
			if(crc & 1)
				crc = (UWORD)((crc >> 1) ^ 0xa001);
			else
				crc >>= 1;
		}

		crctab[i] = crc;
	}
}

IOSerial::~IOSerial()
{
	Close();
}