gistfile1.java

package pal;

public class Utils {
	public static long setBit(int pos, long qword){
		long tmp = 1;
		tmp <<= pos;
		qword|=tmp;
		return qword;
	}
	public static long clearBit(int pos, long qword){
		long tmp = 1;
		tmp <<= pos;
		qword&=~tmp;
		return qword;
	}
	public static long getBit(int pos, long qword){
		return (qword>>pos)&1;
	}
	
	public static int pos2num(String pos){
		int a = ((byte)pos.charAt(0))-0x60;
		int b = ((byte)pos.charAt(1))-0x30;
		return (a-1+Main.edgeSize*(b-1));
	}
	/**@param pos - already shifted position according to direction 
	 * @param direction - 1 left, 2 right, 0 up/down */ 
	public static boolean inBoard(int pos, int direction){
		//upper and lower edges
		if(pos>Main.boardSize||pos<0){
			return false;
		}
		if(direction!=Main.none){
			if(direction==Main.left){
				if ((pos+1)%Main.edgeSize==0)
					return false;
				else
					return true;
			}else if(direction==Main.right){
				if (Math.abs(pos-1)%Main.edgeSize==Main.edgeSize-1)
					return false;
				else
					return true;
			}
			assert(false);
		}
		return true;
	}
	
	/**
	 *          xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx
	 *            32        24        16         8         0 
	 *               --WP--||--BR--||--WR--||--BK--||--WK--|
	 * 
	 */
	public static int getWhiteKing(int status){
		return status=0x3f&(status>>0);		
	}
	public static int getWhiteRook(int status){
		return status=0x3f&(status>>6);
	}
	public static int getBlackKing(int status){
		return status=0x3f&(status>>12);
	}
	public static int getBlackRook(int status){
		return status=0x3f&(status>>18);
	}
	public static int getWhitePawn(int status){
		return status=0x3f&(status>>24);
	}
	public static int setWhiteKing(int status, int position){
		status &= 0xFFFFFFC0;
		return status=status|(position<<0);
	}
	public static int setWhiteRook(int status, int position){
		status &= 0xFFFFF03F;
		return status=status|(position<<6);
	}
	public static int setBlackKing(int status, int position){
		status &= 0xFFFC0FFF;
		return status=status|(position<<12);
	}
	public static int setBlackRook(int status, int position){
		status &= 0xFF03FFFF;
		return status=status|(position<<18);
	}
	public static int setWhitePawn(int status, int position){
		status &= 0xC0FFFFFF;
		return status=status|(position<<24);
	}
	public static boolean isChess(int status){
		if((status>>31)==0)return false;else return true;
	}
	public static int setChess(int status, boolean chess){
		if(chess)
			return status|0x80000000; 
		else 
			return status&0x7fffffff;
	}
	public static int getPieceMoveTo(int move){
		return move&0x0F;
	}
	public static int getPieceMoveFrom(int move){
		return (move>>8)&0x0F;
	}
	public static int getPieceMoveKind(int move){
		return move>>16;
	}

	public static int setPieceMoveTo(int move, int to){
		move&=0xFFFFFF00;
		return move|to;
	}
	public static int setPieceMoveFrom(int move, int from){
		move&=0xFFFF00FF;
		return (from<<8)|move;
	}
	public static int setPieceMoveKind(int move, int kind){
		move&=0xFF00FFFF;
		return (kind<<16)|move;
	}	
	
	
	
}