Convert to write to a "shared ring buffer".HEADmaster

First steps, not actually fully functional yet (i.e. ring buffer is not
actually a ring buffer, and there is no log printer polling the other
side).

1 files changed, 126 insertions, 0 deletions

diff --git a/src/test/java/org/mamago/util/HexDumpEncoder.java b/src/test/java/org/mamago/util/HexDumpEncoder.java
new file mode 100644
index 0000000..7e105d6
--- /dev/null
+++ b/src/test/java/org/mamago/util/HexDumpEncoder.java
@@ -0,0 +1,126 @@
+/*
+ * 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 org.mamago.util;
+
+import java.io.PrintStream;
+import java.io.OutputStream;
+import java.io.IOException;
+
+// ---------------------------------------------------------
+// Copied from sun.misc.HexDumpEncoder, as I got sick of
+// "internal API, may be removed" warnings.
+// ---------------------------------------------------------
+
+/**
+ * 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;
+    }
+
+}