File	Doc	Category	Size	Date	Package
Hex.java	API Doc	Android 1.5 API	7381	Wed May 06 22:41:10 BST 2009	org.apache.commons.codec.binary

Hex

• java.lang.Object

Fields Summary
private static final char[]	DIGITS Used building output as Hex

Constructors Summary

Methods Summary
public byte[]	decode(byte[] array) Converts an array of character bytes representing hexidecimal values into an array of bytes of those same values. The returned array will be half the length of the passed array, as it takes two characters to represent any given byte. An exception is thrown if the passed char array has an odd number of elements. param array An array of character bytes containing hexidecimal digits return A byte array containing binary data decoded from the supplied byte array (representing characters). throws DecoderException Thrown if an odd number of characters is supplied to this function see #decodeHex(char[]) return decodeHex(new String(array).toCharArray());
public java.lang.Object	decode(java.lang.Object object) Converts a String or an array of character bytes representing hexidecimal values into an array of bytes of those same values. The returned array will be half the length of the passed String or array, as it takes two characters to represent any given byte. An exception is thrown if the passed char array has an odd number of elements. param object A String or, an array of character bytes containing hexidecimal digits return A byte array containing binary data decoded from the supplied byte array (representing characters). throws DecoderException Thrown if an odd number of characters is supplied to this function or the object is not a String or char[] see #decodeHex(char[]) try { char[] charArray = object instanceof String ? ((String) object).toCharArray() : (char[]) object; return decodeHex(charArray); } catch (ClassCastException e) { throw new DecoderException(e.getMessage()); }
public static byte[]	decodeHex(char[] data) Converts an array of characters representing hexidecimal values into an array of bytes of those same values. The returned array will be half the length of the passed array, as it takes two characters to represent any given byte. An exception is thrown if the passed char array has an odd number of elements. param data An array of characters containing hexidecimal digits return A byte array containing binary data decoded from the supplied char array. throws DecoderException Thrown if an odd number or illegal of characters is supplied int len = data.length; if ((len & 0x01) != 0) { throw new DecoderException("Odd number of characters."); } byte[] out = new byte[len >> 1]; // two characters form the hex value. for (int i = 0, j = 0; j < len; i++) { int f = toDigit(data[j], j) << 4; j++; f = f | toDigit(data[j], j); j++; out[i] = (byte) (f & 0xFF); } return out;
public byte[]	encode(byte[] array) Converts an array of bytes into an array of bytes for the characters representing the hexidecimal values of each byte in order. The returned array will be double the length of the passed array, as it takes two characters to represent any given byte. param array a byte[] to convert to Hex characters return A byte[] containing the bytes of the hexidecimal characters see #encodeHex(byte[]) return new String(encodeHex(array)).getBytes();
public java.lang.Object	encode(java.lang.Object object) Converts a String or an array of bytes into an array of characters representing the hexidecimal values of each byte in order. The returned array will be double the length of the passed String or array, as it takes two characters to represent any given byte. param object a String, or byte[] to convert to Hex characters return A char[] containing hexidecimal characters throws EncoderException Thrown if the given object is not a String or byte[] see #encodeHex(byte[]) try { byte[] byteArray = object instanceof String ? ((String) object).getBytes() : (byte[]) object; return encodeHex(byteArray); } catch (ClassCastException e) { throw new EncoderException(e.getMessage()); }
public static char[]	encodeHex(byte[] data) Converts an array of bytes into an array of characters representing the hexidecimal values of each byte in order. The returned array will be double the length of the passed array, as it takes two characters to represent any given byte. param data a byte[] to convert to Hex characters return A char[] containing hexidecimal characters int l = data.length; char[] out = new char[l << 1]; // two characters form the hex value. for (int i = 0, j = 0; i < l; i++) { out[j++] = DIGITS[(0xF0 & data[i]) >>> 4 ]; out[j++] = DIGITS[ 0x0F & data[i] ]; } return out;
protected static int	toDigit(char ch, int index) Converts a hexadecimal character to an integer. param ch A character to convert to an integer digit param index The index of the character in the source return An integer throws DecoderException Thrown if ch is an illegal hex character int digit = Character.digit(ch, 16); if (digit == -1) { throw new DecoderException("Illegal hexadecimal charcter " + ch + " at index " + index); } return digit;