package org.webslinger.vfs;

 import java.io.InputStream;

 import java.io.IOException;

 import java.io.OutputStream;

 public abstract class RandomAccess {

     protected long pointer;

     public abstract long getLength() throws IOException;

     public abstract InputStream getInputStream() throws IOException;

     public abstract OutputStream getOutputStream() throws IOException;

     public abstract boolean seek(long pos);

     public abstract int read() throws IOException;

     public abstract void write(int b) throws IOException;

     public abstract void close() throws IOException;

     public long getFilePointer() throws IOException {

         return pointer;

     }

     public int read(byte[] buffer, int offset, int length) throws IOException {

         int result = read(pointer, buffer, offset, length);

         if (result >= 0) pointer += result;

         return result;

     }

     public void write(byte[] buffer, int offset, int length) throws IOException {

         write(pointer, buffer, offset, length);

         pointer += length;

     }

     public abstract int read(long ptr, byte[] buffer, int offset, int length) throws IOException;

     public abstract void write(long ptr, byte[] buffer, int offset, int length) throws IOException;

 }