/*
* @(#)HexDumpEncoder.java 1.5 95/09/06 Chuck McManis
*
* Copyright (c) 1994 Sun Microsystems, Inc. All Rights Reserved.
*
* Permission to use, copy, modify, and distribute this software
* and its documentation for NON-COMMERCIAL purposes and without
* fee is hereby granted provided that this copyright notice
* appears in all copies. Please refer to the file "copyright.html"
* for further important copyright and licensing information.
*
* SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF
* THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
* TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR
* ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
* DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES.
*/
package sun.misc;
import java.io.PrintStream;
import java.io.OutputStream;
import java.io.IOException;
/**
* This class encodes a buffer into the classic: "Hexadecimal Dump" format of
* the past. It is useful for analyzing the contents of binary buffers.
* The format produced is as follows:
* <pre>
* xxxx: 00 11 22 33 44 55 66 77 88 99 aa bb cc dd ee ff ................
* </pre>
* Where xxxx is the offset into the buffer in 16 byte chunks, followed
* by ascii coded hexadecimal bytes followed by the ASCII representation of
* the bytes or '.' if they are not valid bytes.
*
* @version 1.5, 06 Sep 1995
* @author Chuck McManis
*/
public class HexDumpEncoder extends CharacterEncoder {
private int offset;
private int thisLineLength;
private int currentByte;
private byte thisLine[] = new byte[16];
static void hexDigit(PrintStream p, byte x) {
char c;
c = (char) ((x >> 4) & 0xf);
if (c > 9)
c = (char) ((c-10) + 'A');
else
c = (char)(c + '0');
p.write(c);
c = (char) (x & 0xf);
if (c > 9)
c = (char)((c-10) + 'A');
else
c = (char)(c + '0');
p.write(c);
}
int bytesPerAtom() {
return (1);
}
int bytesPerLine() {
return (16);
}
void encodeBufferPrefix(OutputStream o) throws IOException {
offset = 0;
super.encodeBufferPrefix(o);
}
void encodeLinePrefix(OutputStream o, int len) throws IOException {
hexDigit(pStream, (byte)((offset >>> 8) & 0xff));
hexDigit(pStream, (byte)(offset & 0xff));
pStream.print(": ");
currentByte = 0;
thisLineLength = len;
}
void encodeAtom(OutputStream o, byte buf[], int off, int len) throws IOException {
thisLine[currentByte] = buf[off];
hexDigit(pStream, buf[off]);
pStream.print(" ");
currentByte++;
if (currentByte == 8)
pStream.print(" ");
}
void encodeLineSuffix(OutputStream o) throws IOException {
if (thisLineLength < 16) {
for (int i = thisLineLength; i < 16; i++) {
pStream.print(" ");
if (i == 7)
pStream.print(" ");
}
}
pStream.print(" ");
for (int i = 0; i < thisLineLength; i++) {
if ((thisLine[i] < ' ') || (thisLine[i] > 'z')) {
pStream.print(".");
} else {
pStream.write(thisLine[i]);
}
}
pStream.println();
offset += thisLineLength;
}
}