package sample.pack;


import java.nio.*;

public class PackTest3 {

    private int cmd = 47;
    private int eid = 1;
    private int lineno = 100;
    private int sid = 1;
    private int seqid = 32767;
    private int textsiz = 5;
   
    byte REP_INSERT_CMD = 6;
    byte REP_INSERT_ACK_CMD = 7;
    byte REP_JOIN_CMD = 41;
    byte REP_JOIN_ACK_CMD = 42;
    byte REP_PUT_CMD = 45;
    byte REP_PUT_ACK_CMD = 46;
    byte REP_SELECT_CMD = 47;
    byte REP_SELECT_ACK_CMD = 48;
    byte REP_QUIT_CMD = 53;
    byte REP_QUIT_ACK_CMD = 54;

    public byte[] chgBytes( int i ){
    	byte[] b = new byte[4] ;
        
    	b[0] = (byte)((i >>> 24 ) & 0xFF);
    	b[1] = (byte)((i >>> 16 ) & 0xFF);
    	b[2] = (byte)((i >>>  8 ) & 0xFF);
    	b[3] = (byte)((i >>>  0 ) & 0xFF);
    	
    	return b;
    }

    public ByteBuffer pack(int cmd, int sid, int eid, int seqid, int lineno, String text ) {	
    	byte[] b_cmd = new byte[3];
    	byte[] b_sid = new byte[3]; 
    	byte[] b_eid = new byte[3]; 
    	byte[] b_seqid = new byte[3]; 
    	byte[] b_lineno = new byte[3]; 
    	byte[] b_textsiz = new byte[3];
    	byte[] textToByte = text.getBytes();
    	textsiz = text.length();
    	
    	System.out.println(cmd);

    	b_cmd = chgBytes(cmd);
    	
    	System.out.println(b_cmd);
    	
    	b_sid = chgBytes(sid);
    	b_eid = chgBytes(eid);
    	b_seqid = chgBytes(seqid);
    	b_lineno = chgBytes(lineno);
    	b_textsiz = chgBytes(textsiz);   

    	ByteBuffer buffer = ByteBuffer.allocateDirect(24+textsiz);

    	buffer.put(b_cmd); buffer.put(b_sid); buffer.put(b_eid);
    	buffer.put(b_seqid); buffer.put(b_lineno); buffer.put(b_textsiz); 
    	buffer.put(textToByte);

    	return buffer;
    }

    public void unpack(ByteBuffer buffer, int cmd, int sid, int eid, int seqid, int lineno, String text) {
    	int textsiz = 0;

    	buffer.flip();
    	buffer.getInt(cmd); buffer.getInt(sid); buffer.getInt(eid);
    	buffer.getInt(seqid); buffer.getInt(lineno); buffer.getInt(textsiz);
    	
    	byte[] readbyte = new byte[textsiz];
    	for(int i = 0; i < textsiz; i++){
			readbyte[i] = buffer.get();
			//System.out.println(readbyte[i]);
		}
    	text = new String(readbyte, 0, textsiz);

    	System.out.println("unpack:" + cmd +", "+ sid +", "+ eid +", "+ seqid +", "+ lineno +", "+ text);

    }
    
    public void job() {
    	ByteBuffer testbuf = ByteBuffer.allocateDirect(1024);

    	System.out.println("pack unpack test.");
    	testbuf = pack(cmd, sid, eid, seqid, lineno, "test");
	
    	int cmd2=0,sid2=0,eid2=0,seqid2=0,lineno2=0;
    	String string = "";
    	unpack(testbuf,cmd2,sid2,eid2,seqid2,lineno2,string);

    	System.out.println("unpack:" + cmd2 +", "+ sid2 +", "+ eid2 +", "+ seqid2 +", "+ lineno2 +", "+ string);    	
    }
    
    public static void main(String args[]) {
    	new PackTest3().job();
    }
}