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|---|
<--------------- Tr Resume Download |
Fr ---------------> Resume failed |
DR = 0x02: |
TD ---------------> Download Request |
<--------------- Tr Resume Download |
Tf ---------------> CRC mismatched |
<--------------- ACK Transfer entire |
N ---------------> Data |
... |
TC ---------------> End of transfer |
UR = 0x01 or 0x02: |
Tu ---------------> Upload Resume |
<-------------- N CRC Matched |
... |
<-------------- TC End of transfer |
UR = 0x01: |
Tu ---------------> Upload Resume |
<--------------- Fr CRC mismatch |
UR = 0x02: |
Tu ---------------> Upload Resume |
<--------------- Tf CRC mismatch |
ACK---------------> Transfer entire |
FIle |
<--------------- N Data |
... |
<--------------- TC End of transfer |
14 |
4) Packet `TI' : File Information. |
The `TI' Packet is transmitted by the File Sender, provided |
that both entities have their Transport Parameter FI > 0x00. |
It is used to convey specific data concerning the file as it |
exists on the Sending entity. The format of the `TI' Packet |
is as follows: |
<Lead-in> <Sequence> T I <data type> <compression > |
<file length> <creation date> <creation time> |
<modification date> <modification time> |
<true name length> <true name> <Trailer> |
where: |
<data type> : A = ASCII, B = Binary. |
<compression> : Specifies how the file is compressed |
during transmission (has nothing to do |
with the content of the file). |
0x00 = not compressed |
(other values reserved for |
future use by CompuServe) |
<file length> : Current length of the file being sent. |
(Actual number of file data bytes being |
sent, not the number of compressed |
bytes). This value is passed for display |
display or media check only. |
<zone> : Minutes offset from UCT of Sender. |
<creation date> : Date the file was created. |
ASCII decimal string, yyyymmdd |
<creation time> : Time of day the file was created. |
ASCII decimal string, seconds |
since midnight. |
<modification date> : Date the file was last modified. |
Same format as <creation date>. |
(`0' if unknown) |
<modification time> : Time of day the file was last |
modified. Same format as |
<creation time>. (`0' if unknown) |
<true name length> : Number of bytes in <true name>. |
(This is a single binary byte.) |
<true name> : The actual file name with any device, |
directory, or other ancillary information |
removed. |
It is not necessary that all fields be transmitted. |
15 |
A sample TI packet (file information only) is: |
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