121 lines
3.8 KiB
Java
121 lines
3.8 KiB
Java
/*
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* Copyright (c) 1995, 1997, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package sun.misc;
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import java.io.PrintStream;
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import java.io.OutputStream;
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import java.io.IOException;
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/**
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* This class encodes a buffer into the classic: "Hexadecimal Dump" format of
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* the past. It is useful for analyzing the contents of binary buffers.
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* The format produced is as follows:
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* <pre>
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* xxxx: 00 11 22 33 44 55 66 77 88 99 aa bb cc dd ee ff ................
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* </pre>
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* Where xxxx is the offset into the buffer in 16 byte chunks, followed
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* by ascii coded hexadecimal bytes followed by the ASCII representation of
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* the bytes or '.' if they are not valid bytes.
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*
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* @author Chuck McManis
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*/
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public class HexDumpEncoder extends CharacterEncoder {
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private int offset;
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private int thisLineLength;
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private int currentByte;
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private byte thisLine[] = new byte[16];
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static void hexDigit(PrintStream p, byte x) {
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char c;
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c = (char) ((x >> 4) & 0xf);
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if (c > 9)
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c = (char) ((c-10) + 'A');
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else
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c = (char)(c + '0');
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p.write(c);
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c = (char) (x & 0xf);
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if (c > 9)
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c = (char)((c-10) + 'A');
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else
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c = (char)(c + '0');
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p.write(c);
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}
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protected int bytesPerAtom() {
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return (1);
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}
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protected int bytesPerLine() {
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return (16);
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}
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protected void encodeBufferPrefix(OutputStream o) throws IOException {
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offset = 0;
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super.encodeBufferPrefix(o);
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}
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protected void encodeLinePrefix(OutputStream o, int len) throws IOException {
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hexDigit(pStream, (byte)((offset >>> 8) & 0xff));
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hexDigit(pStream, (byte)(offset & 0xff));
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pStream.print(": ");
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currentByte = 0;
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thisLineLength = len;
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}
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protected void encodeAtom(OutputStream o, byte buf[], int off, int len) throws IOException {
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thisLine[currentByte] = buf[off];
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hexDigit(pStream, buf[off]);
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pStream.print(" ");
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currentByte++;
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if (currentByte == 8)
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pStream.print(" ");
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}
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protected void encodeLineSuffix(OutputStream o) throws IOException {
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if (thisLineLength < 16) {
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for (int i = thisLineLength; i < 16; i++) {
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pStream.print(" ");
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if (i == 7)
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pStream.print(" ");
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}
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}
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pStream.print(" ");
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for (int i = 0; i < thisLineLength; i++) {
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if ((thisLine[i] < ' ') || (thisLine[i] > 'z')) {
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pStream.print(".");
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} else {
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pStream.write(thisLine[i]);
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}
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}
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pStream.println();
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offset += thisLineLength;
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}
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}
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