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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 | +} | |