| /* |
| * 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; |
| } |
| |
| } |