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package org.apache.catalina.util;
import org.apache.catalina.LogFacade;
import java.util.ResourceBundle;
/**
* Library of utility methods useful in dealing with converting byte arrays
* to and from strings of hexadecimal digits.
*
* @author Craig R. McClanahan
*/
public final class HexUtils {
private static final ResourceBundle rb = LogFacade.getLogger().getResourceBundle();
// Code from Ajp11, from Apache's JServ
// Table for HEX to DEC byte translation
static final int[] DEC = {
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
00, 01, 02, 03, 04, 05, 06, 07, 8, 9, -1, -1, -1, -1, -1, -1,
-1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
};
/**
* Convert a String of hexadecimal digits into the corresponding
* byte array by encoding each two hexadecimal digits as a byte.
*
* @param digits Hexadecimal digits representation
*
* @exception IllegalArgumentException if an invalid hexadecimal digit
* is found, or the input string contains an odd number of hexadecimal
* digits
*/
public static byte[] convert(String digits) {
int length = digits.length();
if (length % 2 != 0) {
throw new IllegalArgumentException
(rb.getString(LogFacade.ODD_NUMBER_HEX_DIGITS_EXCEPTION));
}
int bLength = length / 2;
byte[] bytes = new byte[bLength];
for (int i = 0; i < bLength; i++) {
char c1 = digits.charAt(2*i);
char c2 = digits.charAt(2*i + 1);
byte b = 0;
if ((c1 >= '0') && (c1 <= '9'))
b += ((c1 - '0') * 16);
else if ((c1 >= 'a') && (c1 <= 'f'))
b += ((c1 - 'a' + 10) * 16);
else if ((c1 >= 'A') && (c1 <= 'F'))
b += ((c1 - 'A' + 10) * 16);
else
throw new IllegalArgumentException
(rb.getString(LogFacade.BAD_HEX_DIGIT_EXCEPTION));
if ((c2 >= '0') && (c2 <= '9'))
b += (c2 - '0');
else if ((c2 >= 'a') && (c2 <= 'f'))
b += (c2 - 'a' + 10);
else if ((c2 >= 'A') && (c2 <= 'F'))
b += (c2 - 'A' + 10);
else
throw new IllegalArgumentException
(rb.getString(LogFacade.BAD_HEX_DIGIT_EXCEPTION));
bytes[i] = b;
}
return bytes;
}
/**
* Convert a byte array into a printable format containing a
* char[] of hexadecimal digit characters (two per byte).
*
* @param bytes Byte array representation
*/
public static char[] convert(byte bytes[]) {
char[] arr = new char[bytes.length * 2];
for (int i = 0; i < bytes.length; i++) {
arr[2*i] = convertDigit((int) (bytes[i] >> 4));
arr[2*i + 1] = convertDigit((int) (bytes[i] & 0x0f));
}
return arr;
}
/**
* Convert 4 hex digits to an int, and return the number of converted
* bytes.
*
* @param hex Byte array containing exactly four hexadecimal digits
*
* @exception IllegalArgumentException if an invalid hexadecimal digit
* is included
*/
public static int convert2Int( byte[] hex ) {
// Code from Ajp11, from Apache's JServ
// assert b.length==4
// assert valid data
int len;
if(hex.length < 4 ) return 0;
if( DEC[hex[0]]<0 )
throw new IllegalArgumentException(rb.getString(LogFacade.BAD_HEX_DIGIT_EXCEPTION));
len = DEC[hex[0]];
len = len << 4;
if( DEC[hex[1]]<0 )
throw new IllegalArgumentException(rb.getString(LogFacade.BAD_HEX_DIGIT_EXCEPTION));
len += DEC[hex[1]];
len = len << 4;
if( DEC[hex[2]]<0 )
throw new IllegalArgumentException(rb.getString(LogFacade.BAD_HEX_DIGIT_EXCEPTION));
len += DEC[hex[2]];
len = len << 4;
if( DEC[hex[3]]<0 )
throw new IllegalArgumentException(rb.getString(LogFacade.BAD_HEX_DIGIT_EXCEPTION));
len += DEC[hex[3]];
return len;
}
/**
* [Private] Convert the specified value (0 .. 15) to the corresponding
* hexadecimal digit.
*
* @param value Value to be converted
*/
private static char convertDigit(int value) {
value &= 0x0f;
if (value >= 10)
return ((char) (value - 10 + 'a'));
else
return ((char) (value + '0'));
}
}