/**
 * @author Tomasz Lubinski
 * (c)2006 algorytm.org
 *
 *  Code 93 Bar Code
 */
public class BarCode {
	
	  private static final char special_1 = 127 + 1; // ($)
	  private static final char special_2 = 127 + 2; // (%)
	  private static final char special_3 = 127 + 3; // (/)
	  private static final char special_4 = 127 + 4; // (+)
	
	  private static final char code93signs[] = {
		        '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
		        'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J',
		        'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T',
		        'U', 'V', 'W', 'X', 'Y', 'Z', '-', '.', ' ', '$',
		        '/', '+', '%', special_1, special_2, special_3, special_4};

	  private static final char code93bars[][] = {
	        {1, 0, 0, 0, 1, 0, 1, 0, 0},
	        {1, 0, 1, 0, 0, 1, 0, 0, 0},
	        {1, 0, 1, 0, 0, 0, 1, 0, 0},
	        {1, 0, 1, 0, 0, 0, 0, 1, 0},
	        {1, 0, 0, 1, 0, 1, 0, 0, 0},
	        {1, 0, 0, 1, 0, 0, 1, 0, 0},
	        {1, 0, 0, 1, 0, 0, 0, 1, 0},
	        {1, 0, 1, 0, 1, 0, 0, 0, 0},
	        {1, 0, 0, 0, 1, 0, 0, 1, 0},
	        {1, 0, 0, 0, 0, 1, 0, 1, 0},
	        {1, 1, 0, 1, 0, 1, 0, 0, 0},
	        {1, 1, 0, 1, 0, 0, 1, 0, 0},
	        {1, 1, 0, 1, 0, 0, 0, 1, 0},
	        {1, 1, 0, 0, 1, 0, 1, 0, 0},
	        {1, 1, 0, 0, 1, 0, 0, 1, 0},
	        {1, 1, 0, 0, 0, 1, 0, 1, 0},
	        {1, 0, 1, 1, 0, 1, 0, 0, 0},
	        {1, 0, 1, 1, 0, 0, 1, 0, 0},
	        {1, 0, 1, 1, 0, 0, 0, 1, 0},
	        {1, 0, 0, 1, 1, 0, 1, 0, 0},
	        {1, 0, 0, 0, 1, 1, 0, 1, 0},
	        {1, 0, 1, 0, 1, 1, 0, 0, 0},
	        {1, 0, 1, 0, 0, 1, 1, 0, 0},
	        {1, 0, 1, 0, 0, 0, 1, 1, 0},
	        {1, 0, 0, 1, 0, 1, 1, 0, 0},
	        {1, 0, 0, 0, 1, 0, 1, 1, 0},
	        {1, 1, 0, 1, 1, 0, 1, 0, 0},
	        {1, 1, 0, 1, 1, 0, 0, 1, 0},
	        {1, 1, 0, 1, 0, 1, 1, 0, 0},
	        {1, 1, 0, 1, 0, 0, 1, 1, 0},
	        {1, 1, 0, 0, 1, 0, 1, 1, 0},
	        {1, 1, 0, 0, 1, 1, 0, 1, 0},
	        {1, 0, 1, 1, 0, 1, 1, 0, 0},
	        {1, 0, 1, 1, 0, 0, 1, 1, 0},
	        {1, 0, 0, 1, 1, 0, 1, 1, 0},
	        {1, 0, 0, 1, 1, 1, 0, 1, 0},
	        {1, 0, 0, 1, 0, 1, 1, 1, 0},
	        {1, 1, 1, 0, 1, 0, 1, 0, 0},
	        {1, 1, 1, 0, 1, 0, 0, 1, 0},
	        {1, 1, 1, 0, 0, 1, 0, 1, 0},
	        {1, 0, 1, 1, 0, 1, 1, 1, 0},
	        {1, 0, 1, 1, 1, 0, 1, 1, 0},
	        {1, 1, 0, 1, 0, 1, 1, 1, 0},
	        {1, 0, 0, 1, 0, 0, 1, 1, 0},
	        {1, 1, 1, 0, 1, 1, 0, 1, 0},
	        {1, 1, 1, 0, 1, 0, 1, 1, 0},
	        {1, 0, 0, 1, 1, 0, 0, 1, 0}
	  };

	  private static final char start_stop[] = {
		  1, 0, 1, 0, 1, 1, 1, 1, 0
	  };
	  
	  private static final char termination_bar[] = {
		  1
	  };	  

	  public boolean check(String txt) {
	      for (int i=0; i<txt.length(); i++) {
              if (checkLetter(txt.charAt(i)) == false)
              		return false;
          }
		  return true;
	  }

	  private boolean checkLetter(char ch) {
	        for (int i=0; i<code93signs.length - 4; i++) {
                if (code93signs[i] == ch)
                	return true;
	        }
	        return false;
	  }
	  
	  public char[] getBars(char ch) {
	        for (int i=0; i<code93signs.length; i++) {
                if (code93signs[i] == ch)
                	return code93bars[i];
	        }		  
		  return null;
	  }
	  
	  public char[] getStartStopBars() {
		  return start_stop;
	  }
	  
	  public char[] getTermination_bar() {
		  return termination_bar;
	  }	  
	  
	  //returns letter value for check digit
	  private int getLetterValue(char ch) {
	          for (int i=0; i<code93signs.length; i++)
	                  if (code93signs[i] == ch)
	                          return i;

	          return 0;
	  }

	  // return check digit C
	  private int checkDigitC(String txt) {
		  
	        int sum = 0;
	        int w = 0;

	        for (int i=txt.length()-1; i>=0; i--)
	        {
	                sum += (getLetterValue(txt.charAt(i)) * ((w % 20) + 1));
	                w++;
	        }

	        return (sum % 47);
	  }	
	  
	  // return check digit K
	  private int checkDigitK(String txt) {
		  
	        int sum = checkDigitC(txt);
	        int w = 1;

	        for (int i=txt.length()-1; i>=0; i--)
	        {
	                sum += (getLetterValue(txt.charAt(i)) * ((w % 15) + 1));
	                w++;
	        }

	        return (sum % 47);
	  }	  
	  
	  public char[] getCheckDigitBarsC(String txt) {
           	return code93bars[checkDigitC(txt)];
	  }	 
	  
	  public char[] getCheckDigitBarsK(String txt) {
         	return code93bars[checkDigitK(txt)];
	  }		  
}