// ========================================================================
// Copyright 2008-2009 NEXCOM Systems
// ------------------------------------------------------------------------
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// ========================================================================
package org.cipango.util;
import java.util.Random;
import org.eclipse.jetty.util.TypeUtil;
public class HexString
{
private static final char __hexChars[] =
{ '0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f' };
private static final char __hexCharsUC[] =
{ '0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F' };
public static void appendHex(StringBuffer buf, int c)
{
buf.append(__hexCharsUC[(c&0xf0)>>4]);
buf.append(__hexCharsUC[c&0x0f]);
}
public static String toHexString(String s)
{
return toHexString(s.getBytes());
}
public static String toHexString(byte buffer[])
{
return toHexString(buffer, 0, buffer.length);
}
public static String toHexString(byte b[], int offset, int length)
{
StringBuffer hex = new StringBuffer(2*length);
for (int i = offset; i < offset + length; i++)
{
hex.append(__hexChars[(b[i]&0xf0)>>4]);
hex.append(__hexChars[b[i]&0x0f]);
}
return hex.toString();
}
public static byte[] fromHexString(String hex) throws NumberFormatException
{
int length = hex.length();
byte[] buf = new byte[(length + 1) / 2];
boolean even = true;
byte b = 0;
int offset = 0;
if ((length % 2) == 1)
even = false;
for (int i = 0; i < length; i++)
{
char c = hex.charAt(i);
int nibble;
if ((c >= '0') && (c <= '9'))
nibble = c - '0';
else if ((c >= 'A') && (c <= 'F'))
nibble = c - 'A' + 0x0A;
else if ((c >= 'a') && (c <= 'f'))
nibble = c - 'a' + 0x0A;
else
throw new NumberFormatException("Invalid hex digit '" + c + "'.");
if (even)
{
b = (byte) (nibble << 4);
}
else
{
b += (byte) nibble;
buf[offset++] = b;
}
even = ! even;
}
return buf;
}
public static String toDetailedHexString(byte[] b, int length)
{
StringBuffer sb = new StringBuffer(5*length);
int lines = (length >>> 4) + 1;
for (int i = 0; i < lines; i++)
{
sb.append(__hexChars[(i>>>4&0xf0)>>4]);
sb.append(__hexChars[i>>>4&0x0f]);
sb.append(__hexChars[(i<<4&0xf0)>>4]);
sb.append(__hexChars[i<<4&0x0f]);
sb.append(' ');
int n = (i == lines - 1) ? length & 0xf : 16;
for (int j = 0; j < 16; j++)
{
if (j < n)
{
int c = b[i*16+j];
sb.append(__hexChars[(c&0xf0)>>4]);
sb.append(__hexChars[c&0x0f]);
sb.append(' ');
}
else
sb.append(" ");
}
for (int j = 0; j < n; j++)
{
int c = b[i*16+j] & 0xff;
if (c > 0x1f && c < 0x7f)
sb.append((char) c);
else
sb.append('.');
}
sb.append('\r'); sb.append('\n');
}
return sb.toString();
}
public static void main(String[] args) {
byte[] b = new byte[16];
Random random = new Random();
random.nextBytes(b);
System.out.println(HexString.toHexString(b));
System.out.println(TypeUtil.toString(b, 16));
}
}