/*
 *   Z M O D E M . H     Manifest constants for ZMODEM
 *    application to application file transfer protocol
 *    01-15-87  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 */
#define ZBINR32 'D'             /* RLE packed Binary frame with 32 bit FCS */
#define ZRESC   0176            /* RLE flag/escape character */

/* 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 CANRLE  010             /* Receiver can decode RLE */
#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 options, one of these in ZF1 */
#define ZMNEW   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 ZMSPARS 5               /* Encoding for sparse file */
#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 */

/* Parameters for ZCOMMAND frame ZF0 (otherwise 0) */
#define ZCACK1  1               /* Acknowledge, then do command */
/* End of Zmodem.h source */