/* gnu.java.math.GMP -- Arbitary precision integers using GMP
   Copyright (C) 2006 Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

GNU Classpath is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Classpath; see the file COPYING.  If not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA.

Linking this library statically or dynamically with other modules is
making a combined work based on this library.  Thus, the terms and
conditions of the GNU General Public License cover the whole
combination.

As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
modules, and to copy and distribute the resulting executable under
terms of your choice, provided that you also meet, for each linked
independent module, the terms and conditions of the license of that
module.  An independent module is a module which is not derived from
or based on this library.  If you modify this library, you may extend
this exception to your version of the library, but you are not
obligated to do so.  If you do not wish to do so, delete this
exception statement from your version. */


package gnu.java.math;

import gnu.classpath.Pointer;

/**
 * Implement BigInteger using GMP
 */
public final class GMP
{
  private Pointer native_ptr;
  private int refCount = 1;

  public GMP()
  {
    super();

    natInitialize();
  }

  private synchronized void acquireRef()
  {
    refCount++;
  }

  private synchronized void releaseRef()
  {
    refCount--;
    if (refCount == 0)
      {
        natFinalize();
        native_ptr = null;
      }
  }

  protected void finalize()
  {
    releaseRef();
  }


  public void fromByteArray(byte[] v)
  {
    acquireRef();
    natFromByteArray(v);
    releaseRef();
  }

  public void fromBI(GMP x)
  {
    acquireRef();
    x.acquireRef();
    natFromBI(x.native_ptr);
    x.releaseRef();
    releaseRef();
  }

  public void fromLong(long n)
  {
    acquireRef();
    natFromLong(n);
    releaseRef();
  }

  public int fromString(String s, int rdx)
  {
    acquireRef();
    int result = natFromString(s, rdx);
    releaseRef();
    return result;
  }

  public void fromSignedMagnitude(byte[] m, boolean isNegative)
  {
    acquireRef();
    natFromSignedMagnitude(m, isNegative);
    releaseRef();
  }

  public String toString(int b)
  {
    acquireRef();
    String result = natToString(b);
    releaseRef();
    return result;
  }

  public void toByteArray(byte[] r)
  {
    acquireRef();
    natToByteArray(r);
    releaseRef();
  }

  public double doubleValue()
  {
    acquireRef();
    double result = natDoubleValue();
    releaseRef();
    return result;
  }

  public int absIntValue()
  {
    acquireRef();
    int result = natAbsIntValue();
    releaseRef();
    return result;
  }

  public int compare(GMP x)
  {
    acquireRef();
    x.acquireRef();
    int result = natCompare(x.native_ptr);
    x.releaseRef();
    releaseRef();
    return result;
  }

  public void add(GMP x, GMP r)
  {
    acquireRef();
    x.acquireRef();
    r.acquireRef();
    natAdd(x.native_ptr, r.native_ptr);
    r.releaseRef();
    x.releaseRef();
    releaseRef();
  }

  public void subtract(GMP x, GMP r)
  {
    acquireRef();
    x.acquireRef();
    r.acquireRef();
    natSubtract(x.native_ptr, r.native_ptr);
    r.releaseRef();
    x.releaseRef();
    releaseRef();
  }

  public void multiply(GMP x, GMP r)
  {
    acquireRef();
    x.acquireRef();
    r.acquireRef();
    natMultiply(x.native_ptr, r.native_ptr);
    r.releaseRef();
    x.releaseRef();
    releaseRef();
  }

  public void quotient(GMP x, GMP r)
  {
    acquireRef();
    x.acquireRef();
    r.acquireRef();
    natQuotient(x.native_ptr, r.native_ptr);
    r.releaseRef();
    x.releaseRef();
    releaseRef();
  }

  public void remainder(GMP x, GMP r)
  {
    acquireRef();
    x.acquireRef();
    r.acquireRef();
    natRemainder(x.native_ptr, r.native_ptr);
    r.releaseRef();
    x.releaseRef();
    releaseRef();
  }

  public void quotientAndRemainder(GMP x, GMP q, GMP r)
  {
    acquireRef();
    x.acquireRef();
    q.acquireRef();
    r.acquireRef();
    natQuotientAndRemainder(x.native_ptr, q.native_ptr, r.native_ptr);
    r.releaseRef();
    q.releaseRef();
    x.releaseRef();
    releaseRef();
  }

  public void modulo(GMP x, GMP r)
  {
    acquireRef();
    x.acquireRef();
    r.acquireRef();
    natModulo(x.native_ptr, r.native_ptr);
    r.releaseRef();
    x.releaseRef();
    releaseRef();
  }

  public void pow(int n, GMP r)
  {
    acquireRef();
    r.acquireRef();
    natPow(n, r.native_ptr);
    r.releaseRef();
    releaseRef();
  }

  public void modPow(GMP e, GMP m, GMP r)
  {
    acquireRef();
    e.acquireRef();
    m.acquireRef();
    r.acquireRef();
    natModPow(e.native_ptr, m.native_ptr, r.native_ptr);
    r.releaseRef();
    m.releaseRef();
    e.releaseRef();
    releaseRef();
  }

  public void modInverse(GMP m, GMP r)
  {
    acquireRef();
    m.acquireRef();
    r.acquireRef();
    natModInverse(m.native_ptr, r.native_ptr);
    r.releaseRef();
    m.releaseRef();
    releaseRef();
  }

  public void gcd(GMP x, GMP r)
  {
    acquireRef();
    x.acquireRef();
    r.acquireRef();
    natGCD(x.native_ptr, r.native_ptr);
    r.releaseRef();
    x.releaseRef();
    releaseRef();
  }

  public void shiftLeft(int n, GMP r)
  {
    acquireRef();
    r.acquireRef();
    natShiftLeft(n, r.native_ptr);
    r.releaseRef();
    releaseRef();
  }

  public void shiftRight(int n, GMP r)
  {
    acquireRef();
    r.acquireRef();
    natShiftRight(n, r.native_ptr);
    r.releaseRef();
    releaseRef();
  }

  public void abs(GMP r)
  {
    acquireRef();
    r.acquireRef();
    natAbs(r.native_ptr);
    r.releaseRef();
    releaseRef();
  }

  public void negate(GMP r)
  {
    acquireRef();
    r.acquireRef();
    natNegate(r.native_ptr);
    r.releaseRef();
    releaseRef();
  }

  public int bitLength()
  {
    acquireRef();
    int result = natBitLength();
    releaseRef();
    return result;
  }

  public int bitCount()
  {
    acquireRef();
    int result = natSetBitCount();
    releaseRef();
    return result;
  }

  public void and(GMP x, GMP r)
  {
    acquireRef();
    x.acquireRef();
    r.acquireRef();
    natAnd(x.native_ptr, r.native_ptr);
    r.releaseRef();
    x.releaseRef();
    releaseRef();
  }

  public void or(GMP x, GMP r)
  {
    acquireRef();
    x.acquireRef();
    r.acquireRef();
    natOr(x.native_ptr, r.native_ptr);
    r.releaseRef();
    x.releaseRef();
    releaseRef();
  }

  public void xor(GMP x, GMP r)
  {
    acquireRef();
    x.acquireRef();
    r.acquireRef();
    natXor(x.native_ptr, r.native_ptr);
    r.releaseRef();
    x.releaseRef();
    releaseRef();
  }

  public void andNot(GMP x, GMP r)
  {
    acquireRef();
    x.acquireRef();
    r.acquireRef();
    natAndNot(x.native_ptr, r.native_ptr);
    r.releaseRef();
    x.releaseRef();
    releaseRef();
  }

  public void not(GMP r)
  {
    acquireRef();
    r.acquireRef();
    natNot(r.native_ptr);
    r.releaseRef();
    releaseRef();
  }

  public void flipBit(int n, GMP r)
  {
    acquireRef();
    r.acquireRef();
    natFlipBit(n, r.native_ptr);
    r.releaseRef();
    releaseRef();
  }

  public int testBit(int n)
  {
    acquireRef();
    int result = natTestBit(n);
    releaseRef();
    return result;
  }

  public void setBit(int n, boolean setIt, GMP r)
  {
    acquireRef();
    r.acquireRef();
    natSetBit(n, setIt, r.native_ptr);
    r.releaseRef();
    releaseRef();
  }

  public int testPrimality(int certainty)
  {
    acquireRef();
    int result = natTestPrimality(certainty);
    releaseRef();
    return result;
  }

  public int lowestSetBit()
  {
    acquireRef();
    int result = natLowestSetBit();
    releaseRef();
    return result;
  }

  // Native methods .........................................................

  public static native void natInitializeLibrary();

  private native void natInitialize();
  private native void natFinalize();

  private native void natFromLong(long n);
  private native void natFromBI(Pointer x);
  private native void natFromByteArray(byte[] v);
  private native int natFromString(String s, int rdx);
  private native void natFromSignedMagnitude(byte[] m, boolean isNegative);

  private native String natToString(int base);
  private native void natToByteArray(byte[] r);
  private native int natAbsIntValue();
  private native double natDoubleValue();

  private native int natCompare(Pointer y);
  private native void natAdd(Pointer x, Pointer r);
  private native void natSubtract(Pointer x, Pointer r);
  private native void natMultiply(Pointer x, Pointer r);
  private native void natQuotient(Pointer x, Pointer r);
  private native void natRemainder(Pointer x, Pointer r);
  private native void natQuotientAndRemainder(Pointer x, Pointer q, Pointer r);
  private native void natModulo(Pointer m, Pointer r);
  private native void natPow(int n, Pointer r);
  private native void natModPow(Pointer e, Pointer m, Pointer r);
  private native void natModInverse(Pointer x, Pointer r);
  private native void natGCD(Pointer x, Pointer r);
  private native int natTestPrimality(int c);
  private native void natShiftLeft(int n, Pointer r);
  private native void natShiftRight(int n, Pointer r);
  private native int natLowestSetBit();
  private native void natAbs(Pointer r);
  private native void natNegate(Pointer r);
  private native int natBitLength();
  private native int natSetBitCount();
  private native void natXor(Pointer x, Pointer r);
  private native void natOr(Pointer x, Pointer r);
  private native void natAnd(Pointer x, Pointer r);
  private native void natAndNot(Pointer x, Pointer r);
  private native void natFlipBit(int n, Pointer r);
  private native int natTestBit(int n);
  private native void natSetBit(int n, boolean setIt, Pointer r);
  private native void natNot(Pointer r);
}