DataIO.java

package RandomFileAccess;

import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;

public class DataIO 
{
	public static String readFixedString(int size,DataInput in) throws IOException
	{
		StringBuilder b = new StringBuilder(size);
		int i =0;
		boolean more = true;
		while(more && i<size)
		{
			char ch = in.readChar();
			i++;
			if(ch==0) more = false;
			else b.append(ch);
		}
		in.skipBytes(2*(size-i));
		return b.toString();
	}
	
	public static void writeFixedString(String s, int size, DataOutput out)
	throws IOException
	{
		int i ;
		for(i=0;i<size;i++)
		{
			char ch = 0;
			if(i<s.length()) ch = s.charAt(i);
			out.writeChar(ch);
		}
	}
}