ch.claudio.iax2
Class Util

java.lang.Object
  ch.claudio.iax2.Util

public final class Util
extends java.lang.Object

Version:

$Id: Util.java 148 2006-09-14 20:52:32Z claudio $

Author:

Claudio Nieder

Copyright (C) 2006 Claudio Nieder <private@claudio.ch>, CH-8610 Uster

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; version 2 of the License.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA

Constructor Summary

Util()

Method Summary

static java.lang.String	getString(byte[] buffer, int offset, int length) Read the requested number of byte from the buffer and return it interpreted an utf-8 encoded string.
static int	getUnsigned16(byte[] buffer, int offset) Read two byte from the buffer and return it interpreted as a big endian unsigned value.
static long	getUnsigned32(byte[] buffer, int offset) Read four byte from the buffer and return it interpreted as a big endian unsigned value.
static int	getUnsigned8(byte[] buffer, int offset) Read a byte from the buffer and return its unsigned value.
static void	main(java.lang.String[] args) Print license.
static java.lang.String	md5(java.lang.String text) Compute an md5 checksum interpreting the text as utf-8 encoded.
static int	putString(byte[] buffer, int offset, java.lang.String value) Put a string into the buffer using utf-8 encoding.
static void	putUnsigned16(byte[] buffer, int offset, int word) Put an unsinged value within the range 0..65536 into a byte array in big endian manner.
static void	putUnsigned32(byte[] buffer, int offset, long word) Put an unsinged value within the range 0..4294967296 into a byte array in big endian matter.
static void	putUnsigned8(byte[] buffer, int offset, int word) Put an unsinged value within the range 0..255 into a byte array.

Methods inherited from class java.lang.Object

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

Constructor Detail

Util

public Util()

Method Detail

md5

public static final java.lang.String md5(java.lang.String text)

Compute an md5 checksum interpreting the text as utf-8 encoded.

Parameters:

text - String for which md5 sum is to be computed

Returns:

String with md5 sum as hex string

putUnsigned8

public static final void putUnsigned8(byte[] buffer,
                                      int offset,
                                      int word)

Put an unsinged value within the range 0..255 into a byte array.

Parameters:

buffer - byte array

offset - where to put the value

word - value to store

putUnsigned16

public static final void putUnsigned16(byte[] buffer,
                                       int offset,
                                       int word)

Put an unsinged value within the range 0..65536 into a byte array in big endian manner.

Parameters:

buffer - byte array

offset - start position to which the value is written

word - value to store

putUnsigned32

public static final void putUnsigned32(byte[] buffer,
                                       int offset,
                                       long word)

Put an unsinged value within the range 0..4294967296 into a byte array in big endian matter.

Parameters:

buffer - byte array

offset - where to put the value

word - value to store

getUnsigned8

public static final int getUnsigned8(byte[] buffer,
                                     int offset)

Read a byte from the buffer and return its unsigned value.

Parameters:

buffer - byte array

offset - where to read the value

Returns:

value

getUnsigned16

public static final int getUnsigned16(byte[] buffer,
                                      int offset)

Read two byte from the buffer and return it interpreted as a big endian unsigned value.

Parameters:

buffer - byte array

offset - where to read the value

Returns:

value

getUnsigned32

public static final long getUnsigned32(byte[] buffer,
                                       int offset)

Read four byte from the buffer and return it interpreted as a big endian unsigned value.

Parameters:

buffer - byte array

offset - where to read the value

Returns:

value

getString

public static final java.lang.String getString(byte[] buffer,
                                               int offset,
                                               int length)

Read the requested number of byte from the buffer and return it interpreted an utf-8 encoded string.

Note: This method terminates the JVM (System.exit(1)) if utf-8 encoding is not supported.

Parameters:

buffer - byte array

offset - where to read the value

length - number of byte to read

Returns:

value

putString

public static final int putString(byte[] buffer,
                                  int offset,
                                  java.lang.String value)

Put a string into the buffer using utf-8 encoding. The string is preceeded by one byte containing its length.

Note: This method terminates the JVM (System.exit(1)) if utf-8 encoding is not supported.

Parameters:

buffer - byte array

offset - where to read the value

value - String to insert

Returns:

legth of encoded string plus 1.

main

public static final void main(java.lang.String[] args)

Print license.

Parameters:

args - ignored