--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hg4j/src/main/java/org/tmatesoft/hg/internal/RevlogDump.java	Tue May 10 10:52:53 2011 +0200
@@ -0,0 +1,106 @@
+/*
+ * Copyright (c) 2010-2011 TMate Software Ltd
+ *  
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program 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 for more details.
+ *
+ * For information on how to redistribute this software under
+ * the terms of a license other than GNU General Public License
+ * contact TMate Software at support@hg4j.com
+ */
+package org.tmatesoft.hg.internal;
+
+import java.io.BufferedInputStream;
+import java.io.DataInput;
+import java.io.DataInputStream;
+import java.io.File;
+import java.io.FileInputStream;
+import java.math.BigInteger;
+import java.util.zip.Inflater;
+
+/**
+ * Utility to test/debug/troubleshoot
+ *  
+ * @author Artem Tikhomirov
+ * @author TMate Software Ltd.
+ */
+public class RevlogDump {
+
+	/**
+	 * Takes 3 command line arguments - 
+	 *   repository path, 
+	 *   path to index file (i.e. store/data/hello.c.i) in the repository (relative) 
+	 *   and "dumpData" whether to print actual content or just revlog headers 
+	 */
+	public static void main(String[] args) throws Exception {
+		String repo = "/temp/hg/hello/.hg/";
+		String filename = "store/00changelog.i";
+//		String filename = "store/data/hello.c.i";
+//		String filename = "store/data/docs/readme.i";
+		boolean dumpData = true;
+		if (args.length > 1) {
+			repo = args[0];
+			filename = args[1];
+			dumpData = args.length > 2 ? "dumpData".equals(args[2]) : false;
+		}
+		//
+		DataInputStream dis = new DataInputStream(new BufferedInputStream(new FileInputStream(new File(repo + filename))));
+		DataInput di = dis;
+		dis.mark(10);
+		int versionField = di.readInt();
+		dis.reset();
+		final int INLINEDATA = 1 << 16;
+		
+		boolean inlineData = (versionField & INLINEDATA) != 0;
+		System.out.printf("%#8x, inline: %b\n", versionField, inlineData);
+		System.out.println("Index    Offset      Flags     Packed     Actual   Base Rev   Link Rev  Parent1  Parent2     nodeid");
+		int entryCount = 0;
+		while (dis.available() > 0) {
+			long l = di.readLong();
+			long offset = l >>> 16;
+			int flags = (int) (l & 0X0FFFF);
+			int compressedLen = di.readInt();
+			int actualLen = di.readInt();
+			int baseRevision = di.readInt();
+			int linkRevision = di.readInt();
+			int parent1Revision = di.readInt();
+			int parent2Revision = di.readInt();
+			byte[] buf = new byte[32];
+			di.readFully(buf, 12, 20);
+			dis.skipBytes(12); 
+			// CAN'T USE skip() here without extra precautions. E.g. I ran into situation when 
+			// buffer was 8192 and BufferedInputStream was at position 8182 before attempt to skip(12). 
+			// BIS silently skips available bytes and leaves me two extra bytes that ruin the rest of the code.
+			System.out.printf("%4d:%14d %6X %10d %10d %10d %10d %8d %8d     %040x\n", entryCount, offset, flags, compressedLen, actualLen, baseRevision, linkRevision, parent1Revision, parent2Revision, new BigInteger(buf));
+			if (inlineData) {
+				String resultString;
+				byte[] data = new byte[compressedLen];
+				di.readFully(data);
+				if (data[0] == 0x78 /* 'x' */) {
+					Inflater zlib = new Inflater();
+					zlib.setInput(data, 0, compressedLen);
+					byte[] result = new byte[actualLen*2];
+					int resultLen = zlib.inflate(result);
+					zlib.end();
+					resultString = new String(result, 0, resultLen, "UTF-8");
+				} else if (data[0] == 0x75 /* 'u' */) {
+					resultString = new String(data, 1, data.length - 1, "UTF-8");
+				} else {
+					resultString = new String(data);
+				}
+				if (dumpData) { 
+					System.out.println(resultString);
+				}
+			}
+			entryCount++;
+		}
+		dis.close();
+		//
+	}
+}