A Namespace Extension Toolkit

/*
  Galaxy Filesystem Toolkit
  Copyright (C) 2005 Chad Yoshikawa
  http://www.ececs.uc.edu/~yoshikco
  yoshikco@ececs.uc.edu

  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; either version 2
  of the License, or (at your option) any later version.

  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.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
*/
package galaxy.java.Commands;

import java.io.*;

import galaxy.java.*;


/**
 * Command to read from a file.
 *
 * @author <a href="mailto:yoshikco@ececs.uc.edu">Chad Yoshikawa</a>
 * @version 1.0
 */
public class ReadCommand extends FileSystemCommand
{

    public ReadCommand(DataInputStream reader, DataOutputStream writer)
    {
        super(reader,writer);
    }


    /**
     * INPUT: filename, offset, count
     * OUTPUT: number of bytes, bytes
     *
     * @param fs the filesystem
     */
    public void DoIt(FileSystem fs) {
        try {
            // Read the args...
            String path = IOLibrary.ReadString(myReader);
            int offset = IOLibrary.ReadInt(myReader);
            int count = IOLibrary.ReadInt(myReader);
            // Driver.logger.debug("JavaFileSystem::Being asked to read "+count+" bytes from file "+path+" beginning at byte "+offset);
            // This is where we call out to the filesystem object
            byte[] result = fs.Read(path,offset,count);
            IOLibrary.WriteBuffer(myWriter,result);
        } catch (Exception ex) {
            Driver.logger.warn("ReadCommand: Error - "+ex);
        }
    }
} // end class