/*
* Copyright (c) 1995, 1997, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code 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 General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
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.
*
* @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);
}
protected int bytesPerAtom() {
return (1);
}
protected int bytesPerLine() {
return (16);
}
protected void encodeBufferPrefix(OutputStream o) throws IOException {
offset = 0;
super.encodeBufferPrefix(o);
}
protected 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;
}
protected 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(" ");
}
protected 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;
}
}