--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/com/tmate/hgkit/ll/HgDirstate.java	Sat Dec 25 21:50:12 2010 +0100
@@ -0,0 +1,126 @@
+/*
+ * Copyright (c) 2010 Artem Tikhomirov 
+ */
+package com.tmate.hgkit.ll;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.Collections;
+import java.util.Date;
+import java.util.LinkedList;
+import java.util.List;
+
+import com.tmate.hgkit.fs.DataAccess;
+import com.tmate.hgkit.fs.DataAccessProvider;
+
+/**
+ * @see http://mercurial.selenic.com/wiki/DirState
+ * @see http://mercurial.selenic.com/wiki/FileFormats#dirstate
+ * @author artem
+ */
+public class HgDirstate {
+
+	private final LocalHgRepo repo;
+	private final File dirstateFile;
+	private List<Record> normal;
+	private List<Record> added;
+	private List<Record> removed;
+	private List<Record> merged;
+
+	public HgDirstate(LocalHgRepo hgRepo, File dirstate) {
+		this.repo = hgRepo;
+		this.dirstateFile = dirstate;
+	}
+
+	private void read() {
+		normal = added = removed = merged = Collections.emptyList();
+		if (!dirstateFile.exists()) {
+			return;
+		}
+		DataAccessProvider dap = repo.getDataAccess();
+		DataAccess da = dap.create(dirstateFile);
+		if (da.isEmpty()) {
+			return;
+		}
+		normal = new LinkedList<Record>();
+		added = new LinkedList<Record>();
+		removed = new LinkedList<Record>();
+		merged = new LinkedList<Record>();
+		try {
+			// XXX skip(40) if we don't need these? 
+			byte[] parents = new byte[40];
+			da.readBytes(parents, 0, 40);
+			parents = null;
+			do {
+				final byte state = da.readByte();
+				final int fmode = da.readInt();
+				final int size = da.readInt();
+				final int time = da.readInt();
+				final int nameLen = da.readInt();
+				String fn1 = null, fn2 = null;
+				byte[] name = new byte[nameLen];
+				da.readBytes(name, 0, nameLen);
+				for (int i = 0; i < nameLen; i++) {
+					if (name[i] == 0) {
+						fn1 = new String(name, 0, i);
+						fn2 = new String(name, i+1, nameLen);
+						break;
+					}
+				}
+				if (fn1 == null) {
+					fn1 = new String(name);
+				}
+				Record r = new Record(fmode, size, time, fn1, fn2);
+				if (state == 'n') {
+					normal.add(r);
+				} else if (state == 'a') {
+					added.add(r);
+				} else if (state == 'r') {
+					removed.add(r);
+				} else if (state == 'm') {
+					merged.add(r);
+				} else {
+					// FIXME log error?
+				}
+			} while (!da.isEmpty());
+		} catch (IOException ex) {
+			ex.printStackTrace(); // FIXME log error, clean dirstate?
+		} finally {
+			da.done();
+		}
+	}
+
+	public void dump() {
+		read();
+		@SuppressWarnings("unchecked")
+		List<Record>[] all = new List[] { normal, added, removed, merged };
+		char[] x = new char[] {'n', 'a', 'r', 'm' };
+		for (int i = 0; i < all.length; i++) {
+			for (Record r : all[i]) {
+				System.out.printf("%c %3o%6d %30tc\t\t%s", x[i], r.mode, r.size, (long) r.time, r.name1);
+				if (r.name2 != null) {
+					System.out.printf(" --> %s", r.name2);
+				}
+				System.out.println();
+			}
+			System.out.println();
+		}
+	}
+	
+	private static class Record {
+		final int mode;
+		final int size;
+		final int time;
+		final String name1;
+		final String name2;
+
+		public Record(int fmode, int fsize, int ftime, String name1, String name2) {
+			mode = fmode;
+			size = fsize;
+			time = ftime;
+			this.name1 = name1;
+			this.name2 = name2;
+			
+		}
+	}
+}