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Overview
========
The AE protocol works by exchanging messages between the Amiga and the Client (e.g. an IBM PC).
Each message consists of a header and optionally payload data. Both parts carry CRC32 checksums
to ensure data integrity.
Message header
--------------
| Bytes | Content |
| -------------- | ---------------------------- |
| TODO | |
Message types
=============
| Msg | ID | Sending side | Description |
| ---- | ----------------- | ------------ | --------------------------------------------------------- |
| 0x00 | MSG_NEXT_PART | Amiga/Client | Ask for next block |
| 0x01 | | Amiga/Client | Transfer cancelled |
| 0x02 | MSG_INIT | Amiga/Client | Initialisation / Init response |
| 0x03 | MSG_MPARTH | Amiga/? | Multipart header |
| 0x04 | MSG_EOF | Amiga | EOF (no payload) |
| 0x05 | MSG_BLOCK | Amiga | Next data block |
| | | | |
| 0x08 | MSG_EXISTS | Amiga | File already exists (when trying to write with 0x66) |
| 0x09 | | Amiga | Size ? (response to 0x6c) |
| 0x0a | MSG_ACK_CLOSE | Amiga | Close response |
| 0x0b | | Amiga | Format response? |
| | | | |
| 0x64 | | Client | List directory |
| 0x65 | MSG_FILE_SEND | Client | File read |
| 0x66 | MSG_FILE_RECV | Client | File/folder write |
| 0x67 | | Client | File/folder delete (recursively) |
| 0x68 | | Client | File rename (name changes) (works on drives, too?) |
| 0x69 | | Client | File move (path changes) |
| 0x6a | | Client | File copy |
| 0x6b | | Client | Set attributes and comment |
| 0x6c | | Client | Request size on disk (?) |
| 0x6d | MSG_FILE_CLOSE | Client | Close file |
| 0x6e | | Client | Format disk (needs Kickstart 2.0 or newer) |
| 0x6f | | Client | New folder |
Message details
===============
64 - List a directory
----------------------
### TODO ###
65 - Read a file
-----------------
### TODO ###
0x66 MSG_FILE_RECV - Write a file (PC -> Amiga)
-----------------------------------------------
Payload:
| Bytes | Content |
| -------------- | ---------------------------- |
| 4 | header size |
| 4 | file size |
| 4 | FIXME ?? |
| 4 | Attributes FIXME: encoding ? |
| 4 | date (hours since 1/1/78) |
| 4 | time (mins since midnight) |
| 4 | ctime |
| 1 | file type FIXME: encoding? |
| header_size-29 | file name |
Expected response: 0x00 MSG_NEXT_PART if file does not exist (yet), 0x08 MSG_EXISTS otherwise
67 - Delete file/folder
------------------------
Payload:
Bytes | Content
-------|--------------------
n | Path
1 | 0x00
Then, read type 0 for confirmation.
Then, sendClose() (0xa response: 5x 00).
If Path is a folder, it will be deleted together with its contents.
68 - Rename file/folder
------------------------
Payload:
Bytes | Content
-------|--------------------
n | Path (including old file name)
1 | 0x00
n | New file name (without path)
1 | 0x00
Then, read type 0 for confirmation.
Then, sendClose() (0xa response: 5x 00).
69 - Move file/folder
----------------------
Payload:
Bytes | Content
-------|--------------------
n | Path (including old file name)
1 | 0x00
n | New path to contain file (folder without trailing slash or file name)
1 | 0x00
1 | 0xc9 (?)
Then, read type 0 for confirmation.
Then, sendClose() (0xa response: 5x 00).
If Path is a folder, it will be moved together with its contents.
This command appears to work across devices.
6a - Copy file/folder
----------------------
Payload:
Bytes | Content
-------|--------------------
n | Path (including old file name)
1 | 0x00
n | New path to contain file (folder without trailing slash or file name)
1 | 0x00
1 | 0xc9 (?)
Then, read type 0 for confirmation.
Then, sendClose() (0xa response: 5x 00).
If Path is a folder, it will be moved together with its contents.
This command appears to work across devices.
6b - Set attributes and comment
--------------------------------
Payload:
Bytes | Content
-------|--------------------
4 | Attributes
n | Path
1 | 0x00
n | Comment
1 | 0x00
4 | Checksum? (seems to be 0x00000000 if comment empty)
Then, read type 0 for confirmation.
Then, sendClose() (0xa response: 5x 00).
6c - Request size on disk (?)
------------------------------------
Payload:
Bytes | Content
-------|--------------------
n | Path
1 | 0x00
Then, read type 0 for confirmation.
Then, read type 9 for 12 bytes of payload (### TODO ###).
Then, send type 0 to request more data (no payload).
Then, read type 9 for 12 bytes of payload (### TODO ###).
Then, send type 0 to request more data (no payload).
Then, read type 0 signaling end of attributes (no payload).
Then, sendClose() (0xa response: 5x 00).
OR
Then, read type 0 for confirmation.
Then, read type 0 signaling end of attributes (no payload).
Then, sendClose() (0xa response: 5x 00).
6d - Close file
----------------
No payload.
Then, read type 0x0a for confirmation (typical payload: 5 bytes of 0x00).
This is used to finish an operation, such as a directory listing
or renaming a file.
6e - Format disk
-----------------
### TODO ###
6f - New folder
----------------
Payload:
Bytes | Content
-------|--------------------
n | Parent path
1 | 0x00
Then, read type 0 for confirmation.
Then, sendClose() (0xa response: 5x 00).
The host will create a new folder in the given path, together with a
matching .info file.
The folder name cannot be chosen, and will be something like "Unnamed1".
To create a folder with a specific name, use 0x66.
Note that 0x66'ing a folder does not seem to set its time.
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