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| 1 | /* | ||
| 2 | * Copyright (c) 1995, 1997, Oracle and/or its affiliates. All rights reserved. | ||
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
| 4 | * | ||
| 5 | * This code is free software; you can redistribute it and/or modify it | ||
| 6 | * under the terms of the GNU General Public License version 2 only, as | ||
| 7 | * published by the Free Software Foundation. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle in the LICENSE file that accompanied this code. | ||
| 10 | * | ||
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT | ||
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
| 14 | * version 2 for more details (a copy is included in the LICENSE file that | ||
| 15 | * accompanied this code). | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU General Public License version | ||
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, | ||
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
| 20 | * | ||
| 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * questions. | ||
| 24 | */ | ||
| 25 | |||
| 26 | |||
| 27 | package sun.misc; | ||
| 28 | import java.io.PrintStream; | ||
| 29 | import java.io.OutputStream; | ||
| 30 | import java.io.IOException; | ||
| 31 | |||
| 32 | /** | ||
| 33 | * This class encodes a buffer into the classic: "Hexadecimal Dump" format of | ||
| 34 | * the past. It is useful for analyzing the contents of binary buffers. | ||
| 35 | * The format produced is as follows: | ||
| 36 | * <pre> | ||
| 37 | * xxxx: 00 11 22 33 44 55 66 77 88 99 aa bb cc dd ee ff ................ | ||
| 38 | * </pre> | ||
| 39 | * Where xxxx is the offset into the buffer in 16 byte chunks, followed | ||
| 40 | * by ascii coded hexadecimal bytes followed by the ASCII representation of | ||
| 41 | * the bytes or '.' if they are not valid bytes. | ||
| 42 | * | ||
| 43 | * @author Chuck McManis | ||
| 44 | */ | ||
| 45 | |||
| 46 | public class HexDumpEncoder extends CharacterEncoder { | ||
| 47 | |||
| 48 | private int offset; | ||
| 49 | private int thisLineLength; | ||
| 50 | private int currentByte; | ||
| 51 | private byte thisLine[] = new byte[16]; | ||
| 52 | |||
| 53 | static void hexDigit(PrintStream p, byte x) { | ||
| 54 | char c; | ||
| 55 | |||
| 56 | c = (char) ((x >> 4) & 0xf); | ||
| 57 | if (c > 9) | ||
| 58 | c = (char) ((c-10) + 'A'); | ||
| 59 | else | ||
| 60 | c = (char)(c + '0'); | ||
| 61 | p.write(c); | ||
| 62 | c = (char) (x & 0xf); | ||
| 63 | if (c > 9) | ||
| 64 | c = (char)((c-10) + 'A'); | ||
| 65 | else | ||
| 66 | c = (char)(c + '0'); | ||
| 67 | p.write(c); | ||
| 68 | } | ||
| 69 | |||
| 70 | protected int bytesPerAtom() { | ||
| 71 | return (1); | ||
| 72 | } | ||
| 73 | |||
| 74 | protected int bytesPerLine() { | ||
| 75 | return (16); | ||
| 76 | } | ||
| 77 | |||
| 78 | protected void encodeBufferPrefix(OutputStream o) throws IOException { | ||
| 79 | offset = 0; | ||
| 80 | super.encodeBufferPrefix(o); | ||
| 81 | } | ||
| 82 | |||
| 83 | protected void encodeLinePrefix(OutputStream o, int len) throws IOException { | ||
| 84 | hexDigit(pStream, (byte)((offset >>> 8) & 0xff)); | ||
| 85 | hexDigit(pStream, (byte)(offset & 0xff)); | ||
| 86 | pStream.print(": "); | ||
| 87 | currentByte = 0; | ||
| 88 | thisLineLength = len; | ||
| 89 | } | ||
| 90 | |||
| 91 | protected void encodeAtom(OutputStream o, byte buf[], int off, int len) throws IOException { | ||
| 92 | thisLine[currentByte] = buf[off]; | ||
| 93 | hexDigit(pStream, buf[off]); | ||
| 94 | pStream.print(" "); | ||
| 95 | currentByte++; | ||
| 96 | if (currentByte == 8) | ||
| 97 | pStream.print(" "); | ||
| 98 | } | ||
| 99 | |||
| 100 | protected void encodeLineSuffix(OutputStream o) throws IOException { | ||
| 101 | if (thisLineLength < 16) { | ||
| 102 | for (int i = thisLineLength; i < 16; i++) { | ||
| 103 | pStream.print(" "); | ||
| 104 | if (i == 7) | ||
| 105 | pStream.print(" "); | ||
| 106 | } | ||
| 107 | } | ||
| 108 | pStream.print(" "); | ||
| 109 | for (int i = 0; i < thisLineLength; i++) { | ||
| 110 | if ((thisLine[i] < ' ') || (thisLine[i] > 'z')) { | ||
| 111 | pStream.print("."); | ||
| 112 | } else { | ||
| 113 | pStream.write(thisLine[i]); | ||
| 114 | } | ||
| 115 | } | ||
| 116 | pStream.println(); | ||
| 117 | offset += thisLineLength; | ||
| 118 | } | ||
| 119 | |||
| 120 | } | ||