/*
 *  Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
 *  Copyright (C) 2008-2008 - INRIA - Allan SIMON
 *
 *  This file must be used under the terms of the CeCILL.
 *  This source file is licensed as described in the file COPYING, which
 *  you should have received as part of this distribution.  The terms
 *  are also available at
 *  http://www.cecill.info/licences/Licence_CeCILL_V2-en.txt
 *
 */

#ifndef __FFT_INTERNAL_H__
#define __FFT_INTERNAL_H__

void dfft2 ( double* a , double* b , int nseg , int n , int nspn ,
             int isn , int ierr, int* iw , int lw );



void dfftbi ( double* a , double* b , int nseg , int n , int nspn ,
              int isn , int ierr, int lout , int lnow ,
              int lused ,int lmax , int lbook , int* rstak , int* istakk );

void fft842 ( int _iDirect , int _iDimen , int* _pdblReal , int* _pdblImag , int _err );

void r2tx ( int _iDimen , double* _pdblReal, double* _pdblImag );
void r4tx ( int _iDimen , double* _pdblReal, double* _pdblImag) ;
void r8tx ( int _iTempDimen , int _iDimen , int _iLengt ,  double* _pdblReal, double* _pdblImag );


int dfftmx ( double* _pdblA , double* _pdblB , int _iNtot, int _iN, int _iNspan,
             int _iIsn, int _iM, int _iKt, int* _piWt, int* _piCk,
             int* _piBt, int* _piSk ,int* _piNp, int* _piNfac);
/* under functions used by dfftmx */
   void preliminaryWork (void);
   void preliminaryWork (void);
   void permute_stage1 (void);
   void permute_stage2 (void);
   void f4t_150 (void);
   void factorOf3Transform (void) ;
   void factorOf5Transform (void) ;
   void preFOtherTransform (void);
   void factorOfOtherTransform (void);
   void pre_sqFactor2NormlOrder (void);
   void nonSqFactor2NormOrder (void) ;
   void detPermutCycles (void);
   void reorderMatrix (void ) ;

   int f4t_170 (void);
   int factorTransform (void);
   int pre_fOf2Trans (void);
   int factorOf2Transform (void);
   int factorOf4Transform (void);
   int  mulByRotationFactor (void );
   int  post_sqFactor2NormlOrder (void);
   int  single_sqFactor2NormlOrder (void);
   int  preF2transform (void) ;
   int  multi_sqFactor2NormlOrder (void);
   int  end (void) ;

#endif /* !__FFT_INTERNAL_H__ */