HexUtils (Tomcat API Documentation)
Keywords: org.apache.tomcat.util.buf.HexUtils class

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## org.apache.tomcat.util.buf
Class HexUtils

    java.lang.Object
      org.apache.tomcat.util.buf.HexUtils

    public final class HexUtils

extends java.lang.Object

Library of utility methods useful in dealing with converting byte arrays to and from strings of hexadecimal digits. Code from Ajp11, from Apache's JServ.

Author:
  Craig R. McClanahan

Field Summary
`static int[]` | `DEC` Table for HEX to DEC byte translation.
`static byte[]` | `HEX` Table for DEC to HEX byte translation.

Constructor Summary
`HexUtils()`

Method Summary
`static java.lang.String` | `convert(byte[] bytes)` Convert a byte array into a printable format containing a String of hexadecimal digit characters (two per byte).
`static byte[]` | `convert(java.lang.String digits)` Convert a String of hexadecimal digits into the corresponding byte array by encoding each two hexadecimal digits as a byte.
`static int` | `convert2Int(byte[] hex)` Convert 4 hex digits to an int, and return the number of converted bytes.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### DEC

    public static final int[] DEC

  Table for HEX to DEC byte translation.

### HEX

    public static final byte[] HEX

  Table for DEC to HEX byte translation.

Constructor Detail

### HexUtils

    public HexUtils()

Method Detail

### convert

    public static byte[] convert(java.lang.String digits)

  Convert a String of hexadecimal digits into the corresponding byte array by encoding each two hexadecimal digits as a byte.

  Parameters:
    `digits` - Hexadecimal digits representation
  Throws:
    `java.lang.IllegalArgumentException` - if an invalid hexadecimal digit is found, or the input string contains an odd number of hexadecimal digits

### convert

    public static java.lang.String convert(byte[] bytes)

  Convert a byte array into a printable format containing a String of hexadecimal digit characters (two per byte).

  Parameters:
    `bytes` - Byte array representation

### convert2Int

    public static int convert2Int(byte[] hex)

  Convert 4 hex digits to an int, and return the number of converted bytes.

  Parameters:
    `hex` - Byte array containing exactly four hexadecimal digits
  Throws:
    `java.lang.IllegalArgumentException` - if an invalid hexadecimal digit is included

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