udt.util
Class Util

java.lang.Object
  udt.util.Util

public class Util
extends Object

helper methods

Field Summary

static long	SYN
static double	SYN_D

Constructor Summary

Util()

Method Summary

static void	copy(InputStream source, OutputStream target) copy input data from the source stream to the target stream
static void	copy(InputStream source, OutputStream target, long size, boolean flush) copy input data from the source stream to the target stream
static void	doHolePunch(UDPEndPoint endpoint, InetAddress client, int clientPort) perform UDP hole punching to the specified client by sending a dummy packet.
static long	getCurrentTime() get the current timer value in microseconds
static long	getSYNTime() get the SYN time in microseconds.
static double	getSYNTimeD()
static double	getSYNTimeSeconds() get the SYN time in seconds.
static String	hexString(MessageDigest digest)
static String	readLine(InputStream input) read a line terminated by a new line '\n' character
static String	readLine(InputStream input, char terminatorChar) read a line from the given input stream

Methods inherited from class java.lang.Object

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

Field Detail

SYN

public static final long SYN

See Also:

Constant Field Values

SYN_D

public static final double SYN_D

See Also:

Constant Field Values

Constructor Detail

Util

public Util()

Method Detail

getCurrentTime

public static long getCurrentTime()

get the current timer value in microseconds

Returns:

getSYNTime

public static final long getSYNTime()

get the SYN time in microseconds. The SYN time is 0.01 seconds = 10000 microseconds

Returns:

getSYNTimeD

public static double getSYNTimeD()

getSYNTimeSeconds

public static double getSYNTimeSeconds()

get the SYN time in seconds. The SYN time is 0.01 seconds = 10000 microseconds

Returns:

readLine

public static String readLine(InputStream input)
                       throws IOException

read a line terminated by a new line '\n' character

Parameters:

input - - the input string to read from

Returns:

the line read or null if end of input is reached

Throws:

IOException

readLine

public static String readLine(InputStream input,
                              char terminatorChar)
                       throws IOException

read a line from the given input stream

Parameters:

input - - the input stream

terminatorChar - - the character used to terminate lines

Returns:

the line read or null if end of input is reached

Throws:

IOException

copy

public static void copy(InputStream source,
                        OutputStream target)
                 throws Exception

copy input data from the source stream to the target stream

Parameters:

source - - input stream to read from

target - - output stream to write to

Throws:

IOException

Exception

copy

public static void copy(InputStream source,
                        OutputStream target,
                        long size,
                        boolean flush)
                 throws IOException

copy input data from the source stream to the target stream

Parameters:

source - - input stream to read from

target - - output stream to write to

size - - how many bytes to copy (-1 for no limit)

flush - - whether to flush after each write

Throws:

IOException

doHolePunch

public static void doHolePunch(UDPEndPoint endpoint,
                               InetAddress client,
                               int clientPort)
                        throws IOException

perform UDP hole punching to the specified client by sending a dummy packet. A local port will be chosen automatically.

Parameters:

client - - client address

Throws:

IOException

hexString

public static String hexString(MessageDigest digest)