--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/com/tmate/hgkit/fs/DataAccess.java	Sat Dec 25 21:50:12 2010 +0100
@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2010 Artem Tikhomirov 
+ */
+package com.tmate.hgkit.fs;
+
+import java.io.IOException;
+
+/**
+ * relevant parts of DataInput, non-stream nature (seek operation), explicit check for end of data.
+ * convenient skip (+/- bytes)
+ * Primary goal - effective file read, so that clients don't need to care whether to call few 
+ * distinct getInt() or readBytes(totalForFewInts) and parse themselves instead in an attempt to optimize.  
+ */
+public class DataAccess {
+	public boolean isEmpty() {
+		return true;
+	}
+	// absolute positioning
+	public void seek(long offset) throws IOException {
+		throw new UnsupportedOperationException();
+	}
+	// relative positioning
+	public void skip(int bytes) throws IOException {
+		throw new UnsupportedOperationException();
+	}
+	// shall be called once this object no longer needed
+	public void done() {
+		// no-op in this empty implementation
+	}
+	public int readInt() throws IOException {
+		byte[] b = new byte[4];
+		readBytes(b, 0, 4);
+		return b[0] << 24 | (b[1] & 0xFF) << 16 | (b[2] & 0xFF) << 8 | (b[3] & 0xFF);
+	}
+	public long readLong() throws IOException {
+		byte[] b = new byte[8];
+		readBytes(b, 0, 8);
+		int i1 = b[0] << 24 | (b[1] & 0xFF) << 16 | (b[2] & 0xFF) << 8 | (b[3] & 0xFF);
+		int i2 = b[4] << 24 | (b[5] & 0xFF) << 16 | (b[6] & 0xFF) << 8 | (b[7] & 0xFF);
+		return ((long) i1) << 32 | ((long) i2 & 0xFFFFFFFF);
+	}
+	public void readBytes(byte[] buf, int offset, int length) throws IOException {
+		throw new UnsupportedOperationException();
+	}
+	public byte readByte() throws IOException {
+		throw new UnsupportedOperationException();
+	}
+}
\ No newline at end of file