--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/org/tmatesoft/hg/internal/DataAccessInputStream.java	Fri Jul 12 20:14:24 2013 +0200
@@ -0,0 +1,76 @@
+/*
+ * Copyright (c) 2013 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.IOException;
+import java.io.InputStream;
+
+/**
+ * Wrap our internal API into a public one
+ * 
+ * @author Artem Tikhomirov
+ * @author TMate Software Ltd.
+ */
+public class DataAccessInputStream extends InputStream {
+	
+	private final DataAccess da;
+	private int bytesLeft = -1;
+
+	public DataAccessInputStream(DataAccess dataAccess) {
+		da = dataAccess;
+	}
+	
+	@Override
+	public int available() throws IOException {
+		initAvailable();
+		return bytesLeft;
+	}
+	
+	@Override
+	public int read() throws IOException {
+		initAvailable();
+		if (bytesLeft == 0) {
+			return -1;
+		}
+		int rv = da.readByte();
+		bytesLeft--;
+		return rv;
+	}
+	
+	@Override
+	public int read(byte[] b, int off, int len) throws IOException {
+		initAvailable();
+		if (bytesLeft == 0) {
+			return -1;
+		}
+		if (len == 0) {
+			return 0;
+		}
+		int x = Math.min(len, bytesLeft);
+		da.readBytes(b, off, x);
+		bytesLeft -= x;
+		return x;
+	}
+
+
+	private void initAvailable() throws IOException {
+		da.reset();
+		if (bytesLeft == -1) {
+			bytesLeft = da.length();
+		}
+	}
+}