text: /*
   *   Z M O D E M . H     Manifest constants for ZMODEM
   *    application to application file transfer protocol
   *    05-23-87  Chuck Forsberg Omen Technology Inc
   */
  #define ZPAD '*'	/* 052 Padding character begins frames */
  #define ZDLE 030	/* Ctrl-X Zmodem escape - `ala BISYNC DLE */
  #define ZDLEE (ZDLE^0100)	/* Escaped ZDLE as transmitted */
  #define ZBIN 'A'	/* Binary frame indicator */
  #define ZHEX 'B'	/* HEX frame indicator */
  #define ZBIN32 'C'	/* Binary frame with 32 bit FCS */
  
  /* Frame types (see array "frametypes" in zm.c) */
  #define ZRQINIT	0	/* Request receive init */
  #define ZRINIT	1	/* Receive init */
  #define ZSINIT 2	/* Send init sequence (optional) */
  #define ZACK 3		/* ACK to above */
  #define ZFILE 4		/* File name from sender */
  #define ZSKIP 5		/* To sender: skip this file */
  #define ZNAK 6		/* Last packet was garbled */
  #define ZABORT 7	/* Abort batch transfers */
  #define ZFIN 8		/* Finish session */
  #define ZRPOS 9		/* Resume data trans at this position */
  #define ZDATA 10	/* Data packet(s) follow */
  #define ZEOF 11		/* End of file */
  #define ZFERR 12	/* Fatal Read or Write error Detected */
  #define ZCRC 13		/* Request for file CRC and response */
  #define ZCHALLENGE 14	/* Receiver's Challenge */
  #define ZCOMPL 15	/* Request is complete */
  #define ZCAN 16		/* Other end canned session with CAN*5 */
  #define ZFREECNT 17	/* Request for free bytes on filesystem */
  #define ZCOMMAND 18	/* Command from sending program */
  #define ZSTDERR 19	/* Output to standard error, data follows */
  
  /* ZDLE sequences */
  #define ZCRCE 'h'	/* CRC next, frame ends, header packet follows */
  #define ZCRCG 'i'	/* CRC next, frame continues nonstop */
  #define ZCRCQ 'j'	/* CRC next, frame continues, ZACK expected */
  #define ZCRCW 'k'	/* CRC next, ZACK expected, end of frame */
  #define ZRUB0 'l'	/* Translate to rubout 0177 */
  #define ZRUB1 'm'	/* Translate to rubout 0377 */
  
  /* zdlread return values (internal) */
  /* -1 is general error, -2 is timeout */
  #define GOTOR 0400
  #define GOTCRCE (ZCRCE|GOTOR)	/* ZDLE-ZCRCE received */
  #define GOTCRCG (ZCRCG|GOTOR)	/* ZDLE-ZCRCG received */
  #define GOTCRCQ (ZCRCQ|GOTOR)	/* ZDLE-ZCRCQ received */
  #define GOTCRCW (ZCRCW|GOTOR)	/* ZDLE-ZCRCW received */
  #define GOTCAN	(GOTOR|030)	/* CAN*5 seen */
  
  /* Byte positions within header array */
  #define ZF0	3	/* First flags byte */
  #define ZF1	2
  #define ZF2	1
  #define ZF3	0
  #define ZP0	0	/* Low order 8 bits of position */
  #define ZP1	1
  #define ZP2	2
  #define ZP3	3	/* High order 8 bits of file position */
  
  /* Bit Masks for ZRINIT flags byte ZF0 */
  #define CANFDX	01	/* Rx can send and receive true FDX */
  #define CANOVIO	02	/* Rx can receive data during disk I/O */
  #define CANBRK	04	/* Rx can send a break signal */
  #define CANCRY	010	/* Receiver can decrypt */
  #define CANLZW	020	/* Receiver can uncompress */
  #define CANFC32	040	/* Receiver can use 32 bit Frame Check */
  #define ESCCTL 0100	/* Receiver expects ctl chars to be escaped */
  #define ESC8   0200	/* Receiver expects 8th bit to be escaped */
  
  /* Parameters for ZSINIT frame */
  #define ZATTNLEN 32	/* Max length of attention string */
  /* Bit Masks for ZSINIT flags byte ZF0 */
  #define TESCCTL 0100	/* Transmitter expects ctl chars to be escaped */
  #define TESC8   0200	/* Transmitter expects 8th bit to be escaped */
  
  /* Parameters for ZFILE frame */
  /* Conversion options one of these in ZF0 */
  #define ZCBIN	1	/* Binary transfer - inhibit conversion */
  #define ZCNL	2	/* Convert NL to local end of line convention */
  #define ZCRESUM	3	/* Resume interrupted file transfer */
  /* Management include options, one of these ored in ZF1 */
  #define ZMSKNOLOC	0200	/* Skip file if not present at rx */
  /* Management options, one of these ored in ZF1 */
  #define ZMMASK	037	/* Mask for the choices below */
  #define ZMNEWL	1	/* Transfer if source newer or longer */
  #define ZMCRC	2	/* Transfer if different file CRC or length */
  #define ZMAPND	3	/* Append contents to existing file (if any) */
  #define ZMCLOB	4	/* Replace existing file */
  #define ZMNEW	5	/* Transfer if source newer */
  	/* Number 5 is alive ... */
  #define ZMDIFF	6	/* Transfer if dates or lengths different */
  #define ZMPROT	7	/* Protect destination file */
  /* Transport options, one of these in ZF2 */
  #define ZTLZW	1	/* Lempel-Ziv compression */
  #define ZTCRYPT	2	/* Encryption */
  #define ZTRLE	3	/* Run Length encoding */
  /* Extended options for ZF3, bit encoded */
  #define ZXSPARS	64	/* Encoding for sparse file operations */
  
  /* Parameters for ZCOMMAND frame ZF0 (otherwise 0) */
  #define ZCACK1	1	/* Acknowledge, then do command */
  
  /* Globals used by ZMODEM functions */
  extern Rxframeind;	/* ZBIN ZBIN32, or ZHEX type of frame received */
  extern Rxtype;		/* Type of header received */
  extern Rxcount;		/* Count of data bytes received */
  extern Zrwindow;	/* RX window size (controls garbage count) */
  extern Rxtimeout;	/* Tenths of seconds to wait for something */
  extern char Rxhdr[4];	/* Received header */
  extern char Txhdr[4];	/* Transmitted header */
  extern long Rxpos;	/* Received file position */
  extern long Txpos;	/* Transmitted file position */
  extern Txfcs32;		/* TURE means send binary frames with 32 bit FCS */
  extern Crc32t;		/* Display flag indicating 32 bit CRC being sent */
  extern Crc32;		/* Display flag indicating 32 bit CRC being received */
  extern Znulls;		/* Number of nulls to send at beginning of ZDATA hdr */
  extern char Attn[ZATTNLEN+1];	/* Attention string rx sends to tx on err */
  
  /* crctab.c */
  
  _PROTOTYPE(long UPDC32 , (int b , long c ));
  
  /* rbsb.c */
  
  _PROTOTYPE(void from_cu , (void));
  _PROTOTYPE(void cucheck , (void));
  _PROTOTYPE(int rdchk , (int f ));
  _PROTOTYPE(int rdchk , (int f ));
  _PROTOTYPE(int mode , (int n ));
  _PROTOTYPE(void sendbrk , (void));
  
  /* zm.c */
  
  _PROTOTYPE(void zsbhdr , (int type , char *hdr ));
  _PROTOTYPE(void zsbh32 , (char *hdr , int type ));
  _PROTOTYPE(void zshhdr , (int type , char *hdr ));
  _PROTOTYPE(void zsdata , (char *buf , int length , int frameend ));
  _PROTOTYPE(void zsda32 , (char *buf , int length , int frameend ));
  _PROTOTYPE(int zrdata , (char *buf , int length ));
  _PROTOTYPE(int zrdat32 , (char *buf , int length ));
  _PROTOTYPE(int zgethdr , (char *hdr , int eflag ));
  _PROTOTYPE(int zrbhdr , (char *hdr ));
  _PROTOTYPE(int zrbhdr32 , (char *hdr ));
  _PROTOTYPE(int zrhhdr , (char *hdr ));
  _PROTOTYPE(void zputhex , (int c ));
  _PROTOTYPE(void zsendline , (int c ));
  _PROTOTYPE(int zgethex , (void));
  _PROTOTYPE(int zgeth1 , (void));
  _PROTOTYPE(int zdlread , (void));
  _PROTOTYPE(int noxrd7 , (void));
  _PROTOTYPE(void stohdr , (long pos ));
  _PROTOTYPE(long rclhdr , (char *hdr ));
  
  /* rz.c sz.c */
  
  void vfile();
  _PROTOTYPE(void bibi , (int n ));
  
  /* End of ZMODEM.H */
  