Mega Code Archive
To Hex String and char
<![CDATA[
/* jcifs smb client library in Java
* Copyright (C) 2000 "Michael B. Allen" <jcifs at samba dot org>
* "Christopher R. Hertel" <jcifs at samba dot org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
import java.io.OutputStream;
import java.io.PrintStream;
/**
*/
public class Hexdump {
private static final String NL = System.getProperty( "line.separator" );
private static final int NL_LENGTH = NL.length();
private static final char[] SPACE_CHARS = {
' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ',
' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ',
' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' '
};
public static final char[] HEX_DIGITS = {
'0', '1', '2', '3', '4', '5',
'6', '7', '8', '9', 'A', 'B',
'C', 'D', 'E', 'F'
};
/**
* Generate "hexdump" output of the buffer at src like the following:
*
* <p><blockquote><pre>
* 00000: 04 d2 29 00 00 01 00 00 00 00 00 01 20 45 47 46 |..)......... EGF|
* 00010: 43 45 46 45 45 43 41 43 41 43 41 43 41 43 41 43 |CEFEECACACACACAC|
* 00020: 41 43 41 43 41 43 41 43 41 43 41 41 44 00 00 20 |ACACACACACAAD.. |
* 00030: 00 01 c0 0c 00 20 00 01 00 00 00 00 00 06 20 00 |..... ........ .|
* 00040: ac 22 22 e1 |."". |
* </blockquote></pre>
*/
public static void hexdump( PrintStream ps, byte[] src, int srcIndex, int length ) {
if( length == 0 ) {
return;
}
int s = length % 16;
int r = ( s == 0 ) ? length / 16 : length / 16 + 1;
char[] c = new char[r * (74 + NL_LENGTH)];
char[] d = new char[16];
int i;
int si = 0;
int ci = 0;
do {
toHexChars( si, c, ci, 5 );
ci += 5;
c[ci++] = ':';
do {
if( si == length ) {
int n = 16 - s;
System.arraycopy( SPACE_CHARS, 0, c, ci, n * 3 );
ci += n * 3;
System.arraycopy( SPACE_CHARS, 0, d, s, n );
break;
}
c[ci++] = ' ';
i = src[srcIndex + si] & 0xFF;
toHexChars( i, c, ci, 2 );
ci += 2;
if( i < 0 || Character.isISOControl( (char)i )) {
d[si % 16] = '.';
} else {
d[si % 16] = (char)i;
}
} while(( ++si % 16 ) != 0 );
c[ci++] = ' ';
c[ci++] = ' ';
c[ci++] = '|';
System.arraycopy( d, 0, c, ci, 16 );
ci += 16;
c[ci++] = '|';
NL.getChars( 0, NL_LENGTH, c, ci );
ci += NL_LENGTH;
} while( si < length );
ps.println( c );
}
/**
* This is an alternative to the <code>java.lang.Integer.toHexString</cod>
* method. It is an efficient relative that also will pad the left side so
* that the result is <code>size</code> digits.
*/
public static String toHexString( int val, int size ) {
char[] c = new char[size];
toHexChars( val, c, 0, size );
return new String( c );
}
public static String toHexString( long val, int size ) {
char[] c = new char[size];
toHexChars( val, c, 0, size );
return new String( c );
}
public static String toHexString( byte[] src, int srcIndex, int size ) {
char[] c = new char[size];
size = ( size % 2 == 0 ) ? size / 2 : size / 2 + 1;
for( int i = 0, j = 0; i < size; i++ ) {
c[j++] = HEX_DIGITS[(src[i] >> 4 ) & 0x0F];
if( j == c.length ) {
break;
}
c[j++] = HEX_DIGITS[src[i] & 0x0F];
}
return new String( c );
}
/**
* This is the same as {@link jcifs.util.Hexdump#toHexString(int val, int
* size)} but provides a more practical form when trying to avoid {@link
* java.lang.String} concatenation and {@link java.lang.StringBuffer}.
*/
public static void toHexChars( int val, char dst[], int dstIndex, int size ) {
while( size > 0 ) {
int i = dstIndex + size - 1;
if( i < dst.length ) {
dst[i] = HEX_DIGITS[val & 0x000F];
}
if( val != 0 ) {
val >>>= 4;
}
size--;
}
}
public static void toHexChars( long val, char dst[], int dstIndex, int size ) {
while( size > 0 ) {
dst[dstIndex + size - 1] = HEX_DIGITS[(int)( val & 0x000FL )];
if( val != 0 ) {
val >>>= 4;
}
size--;
}
}
}
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