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|
Next File Transfer Protocol
===========================
Introduction
------------
Next File Transfer uses a simple protocol where a 2 character code defines
a message type.
The following are standard compents of a message:
+------------+------------------------------------------------------+
| <NNNNNN> | 6 ASCII digits making up a zero-padded number |
+------------+------------------------------------------------------+
| <N bytes> | A stream of N bytes |
+------------+------------------------------------------------------+
Put File
--------
The format of the message from the client is:
+------------+------------------------------------------------------+
| PF | Put file command |
+------------+------------------------------------------------------+
| <NNNNNN> | Length of filename |
+------------+------------------------------------------------------+
| <N bytes> | The filename |
+------------+------------------------------------------------------+
| <NNNNNN> | Length of the data for the file |
+------------+------------------------------------------------------+
| <N bytes> | The data |
+------------+------------------------------------------------------+
The server responds with either:
+------------+------------------------------------------------------+
| OK | The command completed OK |
+------------+------------------------------------------------------+
or:
+------------+------------------------------------------------------+
| !E | There was an error writing the file |
+------------+------------------------------------------------------+
Get File
--------
The format of the message from the client is:
+------------+------------------------------------------------------+
| GF | Get file command |
+------------+------------------------------------------------------+
| <NNNNNN> | Length of filename |
+------------+------------------------------------------------------+
| <N bytes> | The filename |
+------------+------------------------------------------------------+
The server responds with either:
+------------+------------------------------------------------------+
| OK | The command completed OK. The file contents will |
| | follow. |
+------------+------------------------------------------------------+
| <NNNNNN> | Length of the following data |
+------------+------------------------------------------------------+
| <N bytes> | The data from from the file |
+------------+------------------------------------------------------+
or:
+------------+------------------------------------------------------+
| !E | There was an error reading the file |
+------------+------------------------------------------------------+
Change Directory
----------------
The format of the message from the client is:
+------------+------------------------------------------------------+
| CD | Change directory command |
+------------+------------------------------------------------------+
| <NNNNNN> | Length of pathname |
+------------+------------------------------------------------------+
| <N bytes> | The pathname |
+------------+------------------------------------------------------+
The server responds with either:
+------------+------------------------------------------------------+
| OK | The command completed OK |
+------------+------------------------------------------------------+
or:
+------------+------------------------------------------------------+
| !E | There was an error changing to the directory |
+------------+------------------------------------------------------+
Create Directory
----------------
The format of the message from the client is:
+------------+------------------------------------------------------+
| MD | Create directory command |
+------------+------------------------------------------------------+
| <NNNNNN> | Length of pathname |
+------------+------------------------------------------------------+
| <N bytes> | The pathname |
+------------+------------------------------------------------------+
The server responds with either:
+------------+------------------------------------------------------+
| OK | The command completed OK |
+------------+------------------------------------------------------+
or:
+------------+------------------------------------------------------+
| !E | There was an error creating the directory |
+------------+------------------------------------------------------+
List Files
----------
The format of the message from the client is:
+------------+------------------------------------------------------+
| LS | List files command |
+------------+------------------------------------------------------+
The server responds with either:
+------------+------------------------------------------------------+
| OK | The command completed OK |
+------------+------------------------------------------------------+
| <NNNNNN> | The number of filenames |
+------------+------------------------------------------------------+
| <NNNNNN> | Length of filename 1 |
+------------+------------------------------------------------------+
| <N bytes> | Filename 1 |
+------------+------------------------------------------------------+
... above 2 fields repeated ...
+------------+------------------------------------------------------+
| <NNNNNN> | Length of filename N |
+------------+------------------------------------------------------+
| <N bytes> | Filename N |
+------------+------------------------------------------------------+
or:
+------------+------------------------------------------------------+
| !E | There was an error reading the directory |
+------------+------------------------------------------------------+
|
