--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/org/tmatesoft/hg/internal/FileContentSupplier.java	Fri Apr 26 18:38:41 2013 +0200
@@ -0,0 +1,74 @@
+/*
+ * 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.File;
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.nio.channels.FileChannel;
+
+import org.tmatesoft.hg.core.HgIOException;
+import org.tmatesoft.hg.repo.CommitFacility;
+import org.tmatesoft.hg.repo.HgRepository;
+import org.tmatesoft.hg.util.Path;
+
+/**
+ * FIXME files are opened at the moment of instantiation, though the moment the data is requested might be distant
+ * 
+ * @author Artem Tikhomirov
+ * @author TMate Software Ltd.
+ */
+public class FileContentSupplier implements CommitFacility.ByteDataSupplier {
+	private final FileChannel channel;
+	private IOException error;
+	
+	public FileContentSupplier(HgRepository repo, Path file) throws HgIOException {
+		this(new File(repo.getWorkingDir(), file.toString()));
+	}
+
+	public FileContentSupplier(File f) throws HgIOException {
+		if (!f.canRead()) {
+			throw new HgIOException(String.format("Can't read file %s", f), f);
+		}
+		try {
+			channel = new FileInputStream(f).getChannel();
+		} catch (FileNotFoundException ex) {
+			throw new HgIOException("Can't open file", ex, f);
+		}
+	}
+
+	public int read(ByteBuffer buf) {
+		if (error != null) {
+			return -1;
+		}
+		try {
+			return channel.read(buf);
+		} catch (IOException ex) {
+			error = ex;
+		}
+		return -1;
+	}
+	
+	public void done() throws IOException {
+		channel.close();
+		if (error != null) {
+			throw error;
+		}
+	}
+}
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