/*
 * Copyright (C) 1994-1998 T. Teranishi
 * (C) 2009- TeraTerm Project
 * 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. The name of the author may not 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.
 */

#ifndef __ZMODEM_H__
#define __ZMODEM_H__

#include "session.h"
#include "util.h"

#define ZMODEM_BLOCK_SIZE	1024

/* ZMODEM function id */
#define IdZReceive 			1
#define IdZSend   			2
#define IdZAutoR  			3
#define IdZAutoS   			4

enum {
	ZMODEM_MODE,
	ZMODEM_BINFLAG
};

struct zmodem_session {
	struct session *session;
	
	FILE *file;
	unsigned long file_size;
	char file_name[64];
	char *upload_file_path;
	unsigned long file_mtime;

	unsigned char RxHdr[4], TxHdr[4];
	unsigned char RxType, TERM;
	unsigned char PktIn[1032], PktOut[1032];
	short PktInPtr, PktOutPtr;
	short PktInCount, PktOutCount;
	short PktInLen;
	bool BinFlag;
	bool Sending;
	short ZMode, ZState, ZPktState;
	short MaxDataLen, TimeOut, CanCount;
	bool CtlEsc, CRC32, HexLo, Quoted, CRRecv, DoIACEscape;
	short CRC;
	long CRC3, Pos, LastPos, WinSize;
	unsigned char LastSent, LastIAC;

	unsigned long TimeOutAt;
};

struct zmodem_session * ZCreateSender(struct session *session, FILE *fp,
  char *file_name);
struct zmodem_session * ZCreateReceiver(struct session *session, char *path);

bool ZInit(struct zmodem_session *zs);
void ZDestroy(struct zmodem_session *zs);
bool ZParse(struct zmodem_session *zs);
void ZCancel(struct zmodem_session *zs);
bool ZHaveTimedOut(struct zmodem_session *zs);
void ZTimeOutProc(struct zmodem_session *zs);

#endif