java/src/liba.java

   1 /**
   2  * algorithm library
   3  */
   4 public class liba {
   5     /** algorithm library version string */
   6     public static final String VERSION;
   7     static {
   8         System.loadLibrary("a");
   9         VERSION = "0.1.9";
  10         clinit();
  11     }
  12
  13     static final native void clinit();
  14
  15     /**
  16      * square root of an unsigned integer
  17      *
  18      * @param x independent variable
  19      * @return calculated result
  20      */
  21     public static final native int isqrt(int x);
  22
  23     /**
  24      * square root of an unsigned integer
  25      *
  26      * @param x independent variable
  27      * @return calculated result
  28      */
  29     public static final native int isqrt(long x);
  30
  31     /**
  32      * reciprocal of square-root
  33      *
  34      * @param x independent variable
  35      * @return calculated result
  36      */
  37     public static final native float rsqrt(float x);
  38
  39     /**
  40      * reciprocal of square-root
  41      *
  42      * @param x independent variable
  43      * @return calculated result
  44      */
  45     public static final native double rsqrt(double x);
  46
  47     /**
  48      * a hash function whose prime number is 131
  49      *
  50      * @param block block to be processed
  51      * @param value initial value
  52      * @return hash value
  53      */
  54     public static final native int hash_bkdr(byte[] block, int value);
  55
  56     /**
  57      * a hash function whose prime number is 65599
  58      *
  59      * @param block block to be processed
  60      * @param value initial value
  61      * @return hash value
  62      */
  63     public static final native int hash_sdbm(byte[] block, int value);
  64
  65     private liba() {
  66     }
  67 }