org.walluck.oscar.handlers.filetransfer

Class FileTransfer

java.lang.Object

org.walluck.oscar.handlers.filetransfer.FileTransfer

public class FileTransfer
extends Object

File transfer code. Oscar File transfer (OFT) and Oscar Direct Connect (ODC). (ODC is also referred to as DirectIM and IM Image.) There are a few static helper functions at the top, then ODC stuff, then ft stuff. I feel like this is a good place to explain OFT, so I'm going to do just that. Each OFT packet has a header type. I guess this is pretty similar to the subtype of a SNAC packet. The type basically tells the other client the meaning of the OFT packet. There are two distinct types of file transfer, which I usually call "sendfile" and "getfile." Sendfile is when you send a file to another AIM user. Getfile is when you share a group of files, and other users request that you send them the files. A typical sendfile file transfer goes like this:

1. Sender sends a channel 2 ICBM telling the other user that we want to send them a file. At the same time, we open a listener socket (this should be done before sending the ICBM) on some port, and wait for them to connect to us. The ICBM we sent should contain our IP address and the port number that we're listening on.
2. The receiver connects to the sender on the given IP address and port. After the connection is established, the receiver sends an ICBM signifying that we are ready and waiting.
3. The sender sends an OFT PROMPT message over the OFT connection.
4. The receiver of the file sends back an exact copy of this OFT packet, except the cookie is filled in with the cookie from the ICBM. I think this might be an attempt to verify that the user that is connected is actually the guy that we sent the ICBM to. Oh, I've been calling this the ACK.
5. The sender starts sending raw data across the connection until the entire file has been sent.
6. The receiver knows the file is finished because the sender sent the file size in an earlier OFT packet. So then the receiver sends the DONE thingy (after filling in the "received" checksum and size) and closes the connection.

Since:

1.0

Version:

1.0

Author:

David Walluck

Constructor Summary

Constructors

Constructor and Description
FileTransfer(AIMSession sess) Creates a new FileTransfer.

Method Summary

Methods

Modifier and Type	Method and Description
static long	calculateChecksum(String name, long start, long stop) Calculate the checksum for a file with the given name.
void	getFileAccept(byte[] cookie, byte[] rCookie, String screenname, String remoteIPAddress, int remotePort) Accept a get getfile.
void	getFileCancel(byte[] cookie, byte[] rCookie, String screenname, String remoteIPAddress, int remotePort) Cancel a getfile.
void	getFileRequest(byte[] cookie, String screenname) Request a getfile.
void	removeTransfer(byte[] rCookie) Remove a file transfer.
void	sendFileAccept(byte[] cookie, byte[] rCookie, String screenname, String remoteIPAddress, int remotePort) Accept a file.
void	sendFileCancel(byte[] cookie, byte[] rCookie, String screenname, String remoteIPAddress, int remotePort) Cancel a file.
void	sendFileRequest(byte[] cookie, String screenname, int type, int fileCount, int dirSize, String fileName, String message) Send a file transfer request.
void	setWantResponse(boolean wantResponse) Set the value of wantResponse.
boolean	wantResponse() Get the value of wantResponse.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

FileTransfer

public FileTransfer(AIMSession sess)

Creates a new FileTransfer.

Parameters:

sess - the oscar session

Method Detail

calculateChecksum

public static long calculateChecksum(String name,
                     long start,
                     long stop)
                              throws IOException

Calculate the checksum for a file with the given name.

Parameters:

name - the file name

start - the byte to start at

stop - the byte to stop at

Returns:

the checksum

Throws:

IOException - if an error occurs

getFileRequest

public void getFileRequest(byte[] cookie,
                  String screenname)

Request a getfile.

Parameters:

cookie - the cookie

screenname - the screenname

getFileAccept

public void getFileAccept(byte[] cookie,
                 byte[] rCookie,
                 String screenname,
                 String remoteIPAddress,
                 int remotePort)

Accept a get getfile.

Parameters:

cookie - the cookie

rCookie - the remote cookie

screenname - the screenname

remoteIPAddress - the remote IP address

remotePort - the remote port

getFileCancel

public void getFileCancel(byte[] cookie,
                 byte[] rCookie,
                 String screenname,
                 String remoteIPAddress,
                 int remotePort)

Cancel a getfile.

Parameters:

cookie - the cookie

rCookie - the remote cookie

screenname - the screenname

remoteIPAddress - the remote IP address

remotePort - the remote port

sendFileRequest

public void sendFileRequest(byte[] cookie,
                   String screenname,
                   int type,
                   int fileCount,
                   int dirSize,
                   String fileName,
                   String message)

Send a file transfer request.

Parameters:

cookie - the cookie

screenname - the screenname

type - the type

fileCount - the file count

dirSize - the directory size

fileName - the file (or directoy) name

message - the message

sendFileAccept

public void sendFileAccept(byte[] cookie,
                  byte[] rCookie,
                  String screenname,
                  String remoteIPAddress,
                  int remotePort)

Accept a file. We're neither sender nor listener here.

Parameters:

cookie - the cookie

rCookie - the remote cookie

screenname - the screenname

remoteIPAddress - the remote IP address

remotePort - the remote port

sendFileCancel

public void sendFileCancel(byte[] cookie,
                  byte[] rCookie,
                  String screenname,
                  String remoteIPAddress,
                  int remotePort)

Cancel a file.

Parameters:

cookie - the cookie

rCookie - the remote cookie

screenname - the screenname

remoteIPAddress - the remote IP address

remotePort - the remote port

removeTransfer

public void removeTransfer(byte[] rCookie)

Remove a file transfer.

Parameters:

rCookie - the cookie

wantResponse

public boolean wantResponse()

Get the value of wantResponse.

Returns:

value of wantResponse.

setWantResponse

public void setWantResponse(boolean wantResponse)

Set the value of wantResponse.

Parameters:

wantResponse - Value to assign to wantResponse.