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#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 */
ZP0 and ZP1 contain the size of the receiver's buffer in bytes, or 0
if nonstop I/O is allowed.
11.3 ZZZZSSSSIIIINNNNIIIITTTT
The Sender sends flags followed by a binary data subpacket terminated
with ZZZZCCCCRRRRCCCCWWWW.
/* 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
Chapter 11 Rev 10-27-87 Typeset 10-27-87 25
Chapter 11 ZMODEM Protocol 26
*/
The data subpacket contains the null terminated AAAAttttttttnnnn sequence,
maximum length 32 bytes including the terminating null.
11.4 ZZZZAAAACCCCKKKK
Acknowledgment to a ZZZZSSSSIIIINNNNIIIITTTT frame, ZZZZCCCCHHHHAAAALLLLLLLLEEEENNNNGGGGEEEE header, ZZZZCCCCRRRRCCCCQQQQ or ZZZZCCCCRRRRCCCCWWWW
data subpacket. ZP0 to ZP3 contain file offset. The response to
ZCHALLENGE contains the same 32 bit number received in the ZCHALLENGE
header.
11.5 ZZZZFFFFIIIILLLLEEEE
This frame denotes the beginning of a file transmission attempt.
ZF0, ZF1, and ZF2 may contain options. A value of 0 in each of these
bytes implies no special treatment. Options specified to the
receiver override options specified to the sender with the exception
of ZZZZCCCCBBBBIIIINNNN which overrides any other Conversion Option given to the
sender or receiver.
11.5.1 ZZZZFFFF0000:::: CCCCoooonnnnvvvveeeerrrrssssiiiioooonnnn OOOOppppttttiiiioooonnnn
If the receiver does not recognize the Conversion Option, an
application dependent default conversion may apply.
ZZZZCCCCBBBBIIIINNNN "Binary" transfer - inhibit conversion unconditionally
ZZZZCCCCNNNNLLLL Convert received end of line to local end of line
convention. The supported end of line conventions are
CR/LF (most ASCII based operating systems except Unix
and Macintosh), and NL (Unix). Either of these two end
of line conventions meet the permissible ASCII
definitions for Carriage Return and Line Feed/New Line.
Neither the ASCII code nor ZMODEM ZCNL encompass lines
separated only by carriage returns. Other processing
appropriate to ASCII text files and the local operating
system may also be applied by the receiver.[1]
ZZZZCCCCRRRREEEECCCCOOOOVVVV Recover/Resume interrupted file transfer. ZCREVOV is
also useful for updating a remote copy of a file that
grows without resending of old data. If the destination
file exists and is no longer than the source, append to
the destination file and start transfer at the offset
corresponding to the receiver's end of file. This
__________
1. Filtering RUBOUT, NULL, Ctrl-Z, etc.
Chapter 11 Rev 10-27-87 Typeset 10-27-87 26
Chapter 11 ZMODEM Protocol 27