org.apache.mina.proxy.utils

Class ByteUtilities

java.lang.Object

org.apache.mina.proxy.utils.ByteUtilities

public class ByteUtilities
extends Object

ByteUtilities.java - Byte manipulation functions.

Since:

MINA 2.0.0-M3

Author:

Apache MINA Project

Constructor Summary

Constructors

Constructor and Description
ByteUtilities()

Method Summary

Methods

Modifier and Type	Method and Description
static byte[]	asByteArray(String hex) Converts a hex string representation to a byte array.
static String	asHex(byte[] bytes) Returns a hexadecimal representation of the given byte array.
static String	asHex(byte[] bytes, String separator) Returns a hexadecimal representation of the given byte array.
static void	changeByteEndianess(byte[] b, int offset, int length) Invert two bytes in the given byte array starting at the given offset and repeating the inversion length/2 times.
static void	changeWordEndianess(byte[] b, int offset, int length) Invert the endianness of words (4 bytes) in the given byte array starting at the given offset and repeating length/4 times.
static byte[]	encodeString(String s, boolean useUnicode) Encodes the string to a byte array using UTF-16LE or the ASCII charset in function of the useUnicode argument.
static byte[]	getOEMStringAsByteArray(String s) Converts an OEM string as defined in NTLM protocol (eg ASCII charset) to a byte array.
static byte[]	getUTFStringAsByteArray(String s) Converts an UTF-16LE string as defined in NTLM protocol to a byte array.
static void	intToNetworkByteOrder(int num, byte[] buf, int start, int count) Encodes an integer into up to 4 bytes in network byte order in the supplied buffer starting at start offset and writing count bytes.
static byte[]	intToNetworkByteOrder(int num, int count) Encodes an integer into up to 4 bytes in network byte order.
static boolean	isFlagSet(int flagSet, int testFlag) Returns true if the flag testFlag is set in the flags flagset.
static int	makeIntFromByte2(byte[] b) Reads an int from 2 bytes of the given array at offset 0.
static int	makeIntFromByte2(byte[] b, int offset) Reads an int from 2 bytes of the given array at the given offset.
static int	makeIntFromByte4(byte[] b) Reads an int from 4 bytes of the given array at offset 0.
static int	makeIntFromByte4(byte[] b, int offset) Reads an int from 4 bytes of the given array at the given offset.
static int	networkByteOrderToInt(byte[] buf, int start, int count) Returns the integer represented by up to 4 bytes in network byte order.
static byte[]	writeInt(int v) Write a 32 bit int as LITTLE_ENDIAN.
static byte[]	writeInt(int v, byte[] b, int offset) Write a 32 bit int as LITTLE_ENDIAN to the given array b at offset offset.
static byte[]	writeShort(short v) Write a 16 bit short as LITTLE_ENDIAN.
static byte[]	writeShort(short v, byte[] b, int offset) Write a 16 bit short as LITTLE_ENDIAN to the given array b at offset offset.

Methods inherited from class java.lang.Object

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

Constructor Detail

ByteUtilities

public ByteUtilities()

Method Detail

networkByteOrderToInt

public static int networkByteOrderToInt(byte[] buf,
                        int start,
                        int count)

Returns the integer represented by up to 4 bytes in network byte order.

Parameters:

buf - the buffer to read the bytes from

start - The starting position

count - The number of bytes to in the buffer

Returns:

the integer value

intToNetworkByteOrder

public static byte[] intToNetworkByteOrder(int num,
                           int count)

Encodes an integer into up to 4 bytes in network byte order.

Parameters:

num - the int to convert to a byte array

count - the number of reserved bytes for the write operation

Returns:

the resulting byte array

intToNetworkByteOrder

public static void intToNetworkByteOrder(int num,
                         byte[] buf,
                         int start,
                         int count)

Encodes an integer into up to 4 bytes in network byte order in the supplied buffer starting at start offset and writing count bytes.

Parameters:

num - the int to convert to a byte array

buf - the buffer to write the bytes to

start - the offset from beginning for the write operation

count - the number of reserved bytes for the write operation

writeShort

public static final byte[] writeShort(short v)

Write a 16 bit short as LITTLE_ENDIAN.

Parameters:

v - the short to write

Returns:

the Short in a byte[]

writeShort

public static final byte[] writeShort(short v,
                byte[] b,
                int offset)

Write a 16 bit short as LITTLE_ENDIAN to the given array b at offset offset.

Parameters:

v - the short to write

b - the byte array to write to

offset - the offset at which to start writing in the array

Returns:

the Short in a byte[]

writeInt

public static final byte[] writeInt(int v)

Write a 32 bit int as LITTLE_ENDIAN.

Parameters:

v - the int to write

Returns:

the Int in a byte[]

writeInt

public static final byte[] writeInt(int v,
              byte[] b,
              int offset)

Write a 32 bit int as LITTLE_ENDIAN to the given array b at offset offset.

Parameters:

v - the int to write

b - the byte array to write to

offset - the offset at which to start writing in the array

Returns:

the Int in a byte[]

changeWordEndianess

public static final void changeWordEndianess(byte[] b,
                       int offset,
                       int length)

Invert the endianness of words (4 bytes) in the given byte array starting at the given offset and repeating length/4 times. eg: b0b1b2b3 -> b3b2b1b0

Parameters:

b - the byte array

offset - the offset at which to change word start

length - the number of bytes on which to operate (should be a multiple of 4)

changeByteEndianess

public static final void changeByteEndianess(byte[] b,
                       int offset,
                       int length)

Invert two bytes in the given byte array starting at the given offset and repeating the inversion length/2 times. eg: b0b1 -@gt; b1b0

Parameters:

b - the byte array

offset - the offset at which to change word start

length - the number of bytes on which to operate (should be a multiple of 2)

getOEMStringAsByteArray

public static final byte[] getOEMStringAsByteArray(String s)
                                            throws UnsupportedEncodingException

Converts an OEM string as defined in NTLM protocol (eg ASCII charset) to a byte array.

Parameters:

s - the string to convert

Returns:

the result byte array

Throws:

UnsupportedEncodingException - if the string is not an OEM string

getUTFStringAsByteArray

public static final byte[] getUTFStringAsByteArray(String s)
                                            throws UnsupportedEncodingException

Converts an UTF-16LE string as defined in NTLM protocol to a byte array.

Parameters:

s - the string to convert

Returns:

the result byte array

Throws:

UnsupportedEncodingException - if the string is not an UTF-16LE string

encodeString

public static final byte[] encodeString(String s,
                  boolean useUnicode)
                                 throws UnsupportedEncodingException

Encodes the string to a byte array using UTF-16LE or the ASCII charset in function of the useUnicode argument.

Parameters:

s - the string to encode

useUnicode - if true then string is encoded to UTF-16LE otherwise to ASCII

Returns:

the encoded string as a byte array

Throws:

UnsupportedEncodingException - if encoding fails

asHex

public static String asHex(byte[] bytes)

Returns a hexadecimal representation of the given byte array.

Parameters:

bytes - the array to output to an hex string

Returns:

the hex representation as a string

asHex

public static String asHex(byte[] bytes,
           String separator)

Returns a hexadecimal representation of the given byte array.

Parameters:

bytes - the array to output to an hex string

separator - the separator to use between each byte in the output string. If null no char is inserted between each byte value.

Returns:

the hex representation as a string

asByteArray

public static byte[] asByteArray(String hex)

Converts a hex string representation to a byte array.

Parameters:

hex - the string holding the hex values

Returns:

the resulting byte array

makeIntFromByte4

public static final int makeIntFromByte4(byte[] b)

Reads an int from 4 bytes of the given array at offset 0.

Parameters:

b - the byte array to read

Returns:

the integer value

makeIntFromByte4

public static final int makeIntFromByte4(byte[] b,
                   int offset)

Reads an int from 4 bytes of the given array at the given offset.

Parameters:

b - the byte array to read

offset - the offset at which to start

Returns:

the int value

makeIntFromByte2

public static final int makeIntFromByte2(byte[] b)

Reads an int from 2 bytes of the given array at offset 0.

Parameters:

b - the byte array to read

Returns:

the int value

makeIntFromByte2

public static final int makeIntFromByte2(byte[] b,
                   int offset)

Reads an int from 2 bytes of the given array at the given offset.

Parameters:

b - the byte array to read

offset - the offset at which to start

Returns:

the int value

isFlagSet

public static final boolean isFlagSet(int flagSet,
                int testFlag)

Returns true if the flag testFlag is set in the flags flagset.

Parameters:

flagSet - the flagset to test

testFlag - the flag we search the presence of

Returns:

true if testFlag is present in the flagset, false otherwise.