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Class net.fsp.FSPpacket

java.lang.Object
   |
   +----net.fsp.FSPpacket

public class FSPpacket
extends Object

This class handles assembly and disassembly FSP packets from/to DatagramPacket.

FSPpacket class represents one packet sent over network while carrying payload of FSP protocol.

See Also:: DatagramPacket

bb_key: server access KEY, needs to be correct
bb_len: number of required bytes in buffer
bb_pos: file position pointer (4GB-1 max)
bb_seq: client side sequence number, any number can be used
buf: buffer for holding user generated data to be transmited via FSP protocol
CC_BYE: finish a session
CC_DEL_DIR: delete directory
CC_DEL_FILE: delete file
CC_ERR: error response from server
CC_GET_DIR: get a directory listing
CC_GET_FILE: get a file
CC_GET_PRO: get directory protection
CC_GRAB_DONE: atomic get+delete done
CC_GRAB_FILE: atomic get+delete
CC_INFO: get server info block
CC_INSTALL: close a opened file f/wrt
CC_LIMIT: commands >7f are reserverd for FSP v3 headers
CC_MAKE_DIR: make directory
CC_RENAME: rename file or directory
CC_SET_PRO: set directory protection
CC_STAT: get file/directory information
CC_TEST: reserved for testing FSP v3 header
CC_UP_LOAD: open file for writing
CC_VERSION: get server setup
cmd: FSP command, use one of CC_ constants
HSIZE: Size of FSP protocol v2 header - 12 bytes.
MAXSIZE: Maximum packet size (HSIZE+SPACE)
SPACE: Maximum size of FSP data space - 1024 bytes.
sum: FSP packet checksum, field is computed by assemble()
xtra_len: optional data size in buffer

assemble(DatagramPacket): generate UDP packet from this FSP packet
disassemble(DatagramPacket): Disassemble UDP packet into this FSP packet
setData(byte[], int, int, byte[], int, int): set FSP data payload to data1 and data2
toString(): prints header of FSP packet.

HSIZE

 public static final int HSIZE

Size of FSP protocol v2 header - 12 bytes.

SPACE

 public static final int SPACE

Maximum size of FSP data space - 1024 bytes.

MAXSIZE

 public static final int MAXSIZE

Maximum packet size (HSIZE+SPACE)

cmd

 public byte cmd

FSP command, use one of CC_ constants

sum

 public byte sum

FSP packet checksum, field is computed by assemble()

bb_key

 public short bb_key

server access KEY, needs to be correct

bb_seq

 public short bb_seq

client side sequence number, any number can be used

bb_len

 public short bb_len

number of required bytes in buffer

bb_pos

 public int bb_pos

file position pointer (4GB-1 max)

xtra_len

 public int xtra_len

optional data size in buffer

buf

 public byte buf[]

buffer for holding user generated data to be transmited via FSP protocol

CC_VERSION

 public static final byte CC_VERSION

get server setup

CC_INFO

 public static final byte CC_INFO

get server info block

CC_ERR

 public static final byte CC_ERR

error response from server

CC_GET_DIR

 public static final byte CC_GET_DIR

get a directory listing

CC_GET_FILE

 public static final byte CC_GET_FILE

get a file

CC_UP_LOAD

 public static final byte CC_UP_LOAD

open file for writing

CC_INSTALL

 public static final byte CC_INSTALL

close a opened file f/wrt

CC_DEL_FILE

 public static final byte CC_DEL_FILE

delete file

CC_DEL_DIR

 public static final byte CC_DEL_DIR

delete directory

CC_GET_PRO

 public static final byte CC_GET_PRO

get directory protection

CC_SET_PRO

 public static final byte CC_SET_PRO

set directory protection

CC_MAKE_DIR

 public static final byte CC_MAKE_DIR

make directory

CC_BYE

 public static final byte CC_BYE

finish a session

CC_GRAB_FILE

 public static final byte CC_GRAB_FILE

atomic get+delete

CC_GRAB_DONE

 public static final byte CC_GRAB_DONE

atomic get+delete done

CC_STAT

 public static final byte CC_STAT

get file/directory information

CC_RENAME

 public static final byte CC_RENAME

rename file or directory

CC_LIMIT

 public static final byte CC_LIMIT

commands >7f are reserverd for FSP v3 headers

CC_TEST

 public static final byte CC_TEST

reserved for testing FSP v3 header

disassemble

 public boolean disassemble(DatagramPacket udp)

Disassemble UDP packet into this FSP packet

Parameters:: udp - the DatagramPacket to be dissassembled.
Returns:: true if valid FSP packet was found

assemble

 public void assemble(DatagramPacket udp)

generate UDP packet from this FSP packet

toString

 public String toString()

prints header of FSP packet.

Returns:: Header converted to the string
Overrides:: toString in class Object

setData

 public void setData(byte data1[],
                     int offset1,
                     int length1,
                     byte data2[],
                     int offset2,
                     int length2)

set FSP data payload to data1 and data2

Parameters:: data1 - data payload array; offset1 - starting offset of data in data1 array; length1 - data size; data2 - xtra data payload array; offset2 - starting offset of xtra data in data2 array; length2 - xtra data size

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