Class HexUtils

java.lang.Object
org.apache.tomcat.util.buf.HexUtils
public final class HexUtils extends Object
Tables useful when converting byte arrays to and from strings of hexadecimal digits. Code from Ajp11, from Apache's JServ.

  • Method Details

    • getDec

      public static int getDec(int index)
      Get the decimal value of the character at the given index.
      Parameters:
      index - the character index
      Returns:
      the decimal value, or -1 if the character is not a valid hex digit

    • getHex

      public static byte getHex(int index)
      Get the hexadecimal byte for the given index.
      Parameters:
      index - the index into the hex table
      Returns:
      the hexadecimal byte

    • toHexString

      public static String toHexString(char c)
      Convert a character to a hexadecimal string representation.
      Parameters:
      c - the character to convert
      Returns:
      the hexadecimal string representation of the character

    • toHexString

      public static String toHexString(byte[] bytes)
      Convert a byte array to a hexadecimal string representation.
      Parameters:
      bytes - the byte array to convert
      Returns:
      the hexadecimal string, or null if the input is null

    • fromHexString

      public static byte[] fromHexString(String input)
      Convert a hexadecimal string to a byte array.
      Parameters:
      input - the hexadecimal string to convert
      Returns:
      the byte array, or null if the input is null
      Throws:
      IllegalArgumentException - if the input has an odd number of characters or contains non-hexadecimal characters