Package org.gvsig.dwg.lib.util

Class HexUtil

java.lang.Object

org.gvsig.dwg.lib.util.HexUtil

public class HexUtil
extends Object

Number in hexadecimal format are used throughout Freenet.

Unless otherwise stated, the conventions follow the rules outlined in the Java Language Specification.

Author:

syoung

Method Summary

Modifier and Type	Method	Description
static final byte[]	bitsToBytes(BitSet ba, int size)	Pack the bits in ba into a byte[].
static final String	bitsToHexString(BitSet ba, int size)	Pack the bits in ba into a byte[] then convert that to a hex string and return it.
static void	bytesToBits(byte[] b, BitSet ba, int maxSize)	Read bits from a byte array into a bitset
static final String	bytesToHex(byte[] bs)
static final String	bytesToHex(byte[] bs, int off, int length)	Converts a byte array into a string of upper case hex chars.
static final void	bytesToHexAppend(byte[] bs, int off, int length, StringBuffer sb)
static int	countBytesForBits(int size)
static void	hexToBits(String s, BitSet ba, int length)	Read a hex string of bits and write it into a bitset
static final byte[]	hexToBytes(String s)
static final void	hexToBytes(String s, byte[] out, int off)	Converts a String of hex characters into an array of bytes.
static final byte[]	hexToBytes(String s, int off)

Methods inherited from class java.lang.Object

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

Method Details

bytesToHex

public static final String bytesToHex(byte[] bs,
 int off,
 int length)

Converts a byte array into a string of upper case hex chars.

Parameters:

bs - A byte array

off - The index of the first byte to read

length - The number of bytes to read.

Returns:

the string of hex chars.

bytesToHexAppend

public static final void bytesToHexAppend(byte[] bs,
 int off,
 int length,
 StringBuffer sb)

bytesToHex

public static final String bytesToHex(byte[] bs)

hexToBytes

public static final byte[] hexToBytes(String s)

hexToBytes

public static final byte[] hexToBytes(String s,
 int off)

hexToBytes

public static final void hexToBytes(String s,
 byte[] out,
 int off)
                             throws NumberFormatException,
IndexOutOfBoundsException

Converts a String of hex characters into an array of bytes.

Parameters:

s - A string of hex characters (upper case or lower) of even length.

out - A byte array of length at least s.length()/2 + off

off - The first byte to write of the array

Throws:

NumberFormatException

IndexOutOfBoundsException

bitsToBytes

public static final byte[] bitsToBytes(BitSet ba,
 int size)

Pack the bits in ba into a byte[].

bitsToHexString

public static final String bitsToHexString(BitSet ba,
 int size)

Pack the bits in ba into a byte[] then convert that to a hex string and return it.

countBytesForBits

public static int countBytesForBits(int size)

Returns:

the number of bytes required to represent the bitset

bytesToBits

public static void bytesToBits(byte[] b,
 BitSet ba,
 int maxSize)

Read bits from a byte array into a bitset

Parameters:

b - the byte[] to read from

ba - the bitset to write to

hexToBits

public static void hexToBits(String s,
 BitSet ba,
 int length)

Read a hex string of bits and write it into a bitset

Parameters:

s - hex string of the stored bits

ba - the bitset to store the bits in

length - the maximum number of bits to store