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+/*
+ * Copyright 1995-1997 Sun Microsystems, Inc. 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. Sun designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+package net.sourceforge.jnlp.tools;
+
+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;
+ }
+
+}