// File: Block.java
//
// Author: Andrew H. Fagg
// 11/15/2
//
// Basic structure + constants for our disk blocks.
// Subclasses define the specifics of how the bytes within a block are used
//
// To Do: nothing
//


import java.util.*;
import java.lang.*;
import java.io.*;


abstract class Block {
    // These constants assume a block size of 1024
    final public int nameSize = 20;        // Maximum length of file/dir name

    public short nextBlkPtr;        // Pointer to the next file block or free block (vs)

    final public int maxFiles = 36;        // Maximum number of files/dir in	(vs)
                                            //   a directory

    public int block_num;                   // Set by the read method
    public Disk disk;                       // Reference to the disk object


    // Must be defined by each block type
    abstract public void write(int block) throws FileSystemException;
    abstract public void read(int block) throws FileSystemException;
};