@Override
public void read(Connection c) throws IOException {
DataInputStream d = c.getDataInputStream();
int length = d.read();
d.readByte();
set(Const.LENGTH, length);
readOffSet(c);
d.close();
}
@Override
public void readOffSet(Connection c) throws IOException {
DataInputStream d = c.getDataInputStream();
int length = (Integer) get(Const.LENGTH);
int blockLength = length - 9;
d.readByte();
int index = d.read();
int begin = d.read();
byte[] data = new byte[blockLength];
d.readFully(data);
set(Const.INDEX, index);
set(Const.BEGIN, begin);
set(Const.DATA, data);
d.close();
}