/*
 *   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 */

/* 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 */

/* Parameters for ZSINIT frame */
#define ZATTNLEN 32     /* Max length of attention string */

/* 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 */