This file is indexed.

/usr/include/sfftw.h is in sfftw-dev 2.1.5-3.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
/* fftw/fftw.h.  Generated from fftw.h.in by configure.  */
/* -*- C -*- */
/*
 * Copyright (c) 1997-1999, 2003 Massachusetts Institute of Technology
 *
 * This program 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 of the License, or
 * (at your option) any later version.
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

/* fftw.h -- system-wide definitions */
/* $Id: fftw.h.in,v 1.57 2003/03/16 23:43:46 stevenj Exp $ */

#ifndef FFTW_H
#define FFTW_H

#include <stdlib.h>
#include <stdio.h>

#ifdef __cplusplus
extern "C" {
#endif				/* __cplusplus */

/* Define for using single precision */
/*
 * If you can, use configure --enable-float instead of changing this
 * flag directly 
 */
#define FFTW_ENABLE_FLOAT /**/

/* our real numbers */
#ifdef FFTW_ENABLE_FLOAT
typedef float fftw_real;
#else
typedef double fftw_real;
#endif

/*********************************************
 * Complex numbers and operations 
 *********************************************/
typedef struct {
     fftw_real re, im;
} fftw_complex;
#define c_re(c)  ((c).re)
#define c_im(c)  ((c).im)

typedef enum {
     FFTW_FORWARD = -1, FFTW_BACKWARD = 1
} fftw_direction;

/* backward compatibility with FFTW-1.3 */
typedef fftw_complex FFTW_COMPLEX;
typedef fftw_real FFTW_REAL;

#ifndef FFTW_1_0_COMPATIBILITY
#define FFTW_1_0_COMPATIBILITY 0
#endif

#if FFTW_1_0_COMPATIBILITY
/* backward compatibility with FFTW-1.0 */
#define REAL fftw_real
#define COMPLEX fftw_complex
#endif

/*********************************************
 * Success or failure status
 *********************************************/

typedef enum {
     FFTW_SUCCESS = 0, FFTW_FAILURE = -1
} fftw_status;

/*********************************************
 *              Codelets
 *********************************************/
typedef void (fftw_notw_codelet) 
     (const fftw_complex *, fftw_complex *, int, int);
typedef void (fftw_twiddle_codelet)
     (fftw_complex *, const fftw_complex *, int,
      int, int);
typedef void (fftw_generic_codelet) 
     (fftw_complex *, const fftw_complex *, int,
      int, int, int);
typedef void (fftw_real2hc_codelet)
     (const fftw_real *, fftw_real *, fftw_real *,
      int, int, int);
typedef void (fftw_hc2real_codelet)
     (const fftw_real *, const fftw_real *,
      fftw_real *, int, int, int);
typedef void (fftw_hc2hc_codelet)
     (fftw_real *, const fftw_complex *,
      int, int, int);
typedef void (fftw_rgeneric_codelet)
     (fftw_real *, const fftw_complex *, int,
      int, int, int);

/*********************************************
 *     Configurations
 *********************************************/
/*
 * A configuration is a database of all known codelets
 */

enum fftw_node_type {
     FFTW_NOTW, FFTW_TWIDDLE, FFTW_GENERIC, FFTW_RADER,
     FFTW_REAL2HC, FFTW_HC2REAL, FFTW_HC2HC, FFTW_RGENERIC
};

/* description of a codelet */
typedef struct {
     const char *name;		/* name of the codelet */
     void (*codelet) ();	/* pointer to the codelet itself */
     int size;			/* size of the codelet */
     fftw_direction dir;	/* direction */
     enum fftw_node_type type;	/* TWIDDLE or NO_TWIDDLE */
     int signature;		/* unique id */
     int ntwiddle;		/* number of twiddle factors */
     const int *twiddle_order;	/* 
				 * array that determines the order 
				 * in which the codelet expects
				 * the twiddle factors
				 */
} fftw_codelet_desc;

/* On Win32, you need to do funny things to access global variables
   in shared libraries.  Thanks to Andrew Sterian for this hack. */
#ifdef HAVE_WIN32
#  if defined(BUILD_FFTW_DLL)
#    define DL_IMPORT(type) __declspec(dllexport) type
#  elif defined(USE_FFTW_DLL)
#    define DL_IMPORT(type) __declspec(dllimport) type
#  else
#    define DL_IMPORT(type) type
#  endif
#else
#  define DL_IMPORT(type) type
#endif

extern DL_IMPORT(const char *) fftw_version;

/*****************************
 *        Plans
 *****************************/
/*
 * A plan is a sequence of reductions to compute a FFT of
 * a given size.  At each step, the FFT algorithm can:
 *
 * 1) apply a notw codelet, or
 * 2) recurse and apply a twiddle codelet, or
 * 3) apply the generic codelet.
 */

/* structure that contains twiddle factors */
typedef struct fftw_twiddle_struct {
     int n;
     const fftw_codelet_desc *cdesc;
     fftw_complex *twarray;
     struct fftw_twiddle_struct *next;
     int refcnt;
} fftw_twiddle;

typedef struct fftw_rader_data_struct {
     struct fftw_plan_struct *plan;
     fftw_complex *omega;
     int g, ginv;
     int p, flags, refcount;
     struct fftw_rader_data_struct *next;
     fftw_codelet_desc *cdesc;
} fftw_rader_data;

typedef void (fftw_rader_codelet) 
     (fftw_complex *, const fftw_complex *, int,
      int, int, fftw_rader_data *);

/* structure that holds all the data needed for a given step */
typedef struct fftw_plan_node_struct {
     enum fftw_node_type type;

     union {
	  /* nodes of type FFTW_NOTW */
	  struct {
	       int size;
	       fftw_notw_codelet *codelet;
	       const fftw_codelet_desc *codelet_desc;
	  } notw;

	  /* nodes of type FFTW_TWIDDLE */
	  struct {
	       int size;
	       fftw_twiddle_codelet *codelet;
	       fftw_twiddle *tw;
	       struct fftw_plan_node_struct *recurse;
	       const fftw_codelet_desc *codelet_desc;
	  } twiddle;

	  /* nodes of type FFTW_GENERIC */
	  struct {
	       int size;
	       fftw_generic_codelet *codelet;
	       fftw_twiddle *tw;
	       struct fftw_plan_node_struct *recurse;
	  } generic;

	  /* nodes of type FFTW_RADER */
	  struct {
	       int size;
	       fftw_rader_codelet *codelet;
	       fftw_rader_data *rader_data;
	       fftw_twiddle *tw;
	       struct fftw_plan_node_struct *recurse;
	  } rader;

	  /* nodes of type FFTW_REAL2HC */
	  struct {
	       int size;
	       fftw_real2hc_codelet *codelet;
	       const fftw_codelet_desc *codelet_desc;
	  } real2hc;

	  /* nodes of type FFTW_HC2REAL */
	  struct {
	       int size;
	       fftw_hc2real_codelet *codelet;
	       const fftw_codelet_desc *codelet_desc;
	  } hc2real;

	  /* nodes of type FFTW_HC2HC */
	  struct {
	       int size;
	       fftw_direction dir;
	       fftw_hc2hc_codelet *codelet;
	       fftw_twiddle *tw;
	       struct fftw_plan_node_struct *recurse;
	       const fftw_codelet_desc *codelet_desc;
	  } hc2hc;

	  /* nodes of type FFTW_RGENERIC */
	  struct {
	       int size;
	       fftw_direction dir;
	       fftw_rgeneric_codelet *codelet;
	       fftw_twiddle *tw;
	       struct fftw_plan_node_struct *recurse;
	  } rgeneric;
     } nodeu;

     int refcnt;
} fftw_plan_node;

typedef enum {
     FFTW_NORMAL_RECURSE = 0,
     FFTW_VECTOR_RECURSE = 1
} fftw_recurse_kind;

struct fftw_plan_struct {
     int n;
     int refcnt;
     fftw_direction dir;
     int flags;
     int wisdom_signature;
     enum fftw_node_type wisdom_type;
     struct fftw_plan_struct *next;
     fftw_plan_node *root;
     double cost;
     fftw_recurse_kind recurse_kind;
     int vector_size;
};

typedef struct fftw_plan_struct *fftw_plan;

/* flags for the planner */
#define  FFTW_ESTIMATE (0)
#define  FFTW_MEASURE  (1)

#define FFTW_OUT_OF_PLACE (0)
#define FFTW_IN_PLACE (8)
#define FFTW_USE_WISDOM (16)

#define FFTW_THREADSAFE (128)  /* guarantee plan is read-only so that the
				  same plan can be used in parallel by
				  multiple threads */

#define FFTWND_FORCE_BUFFERED (256)     /* internal flag, forces buffering
                                           in fftwnd transforms */

#define FFTW_NO_VECTOR_RECURSE (512)    /* internal flag, prevents use
                                           of vector recursion */

extern fftw_plan fftw_create_plan_specific(int n, fftw_direction dir,
					   int flags,
					   fftw_complex *in, int istride,
					 fftw_complex *out, int ostride);
#define FFTW_HAS_PLAN_SPECIFIC
extern fftw_plan fftw_create_plan(int n, fftw_direction dir, int flags);
extern void fftw_print_plan(fftw_plan plan);
extern void fftw_destroy_plan(fftw_plan plan);
extern void fftw(fftw_plan plan, int howmany, fftw_complex *in, int istride,
		 int idist, fftw_complex *out, int ostride, int odist);
extern void fftw_one(fftw_plan plan, fftw_complex *in, fftw_complex *out);
extern void fftw_die(const char *s);
extern void *fftw_malloc(size_t n);
extern void fftw_free(void *p);
extern void fftw_check_memory_leaks(void);
extern void fftw_print_max_memory_usage(void);

typedef void *(*fftw_malloc_type_function) (size_t n);
typedef void  (*fftw_free_type_function) (void *p);
typedef void  (*fftw_die_type_function) (const char *errString);
extern DL_IMPORT(fftw_malloc_type_function) fftw_malloc_hook;
extern DL_IMPORT(fftw_free_type_function) fftw_free_hook;
extern DL_IMPORT(fftw_die_type_function) fftw_die_hook;

extern size_t fftw_sizeof_fftw_real(void);

/* Wisdom: */
/*
 * define this symbol so that users know we are using a version of FFTW
 * with wisdom
 */
#define FFTW_HAS_WISDOM
extern void fftw_forget_wisdom(void);
extern void fftw_export_wisdom(void (*emitter) (char c, void *), void *data);
extern fftw_status fftw_import_wisdom(int (*g) (void *), void *data);
extern void fftw_export_wisdom_to_file(FILE *output_file);
extern fftw_status fftw_import_wisdom_from_file(FILE *input_file);
extern char *fftw_export_wisdom_to_string(void);
extern fftw_status fftw_import_wisdom_from_string(const char *input_string);

/*
 * define symbol so we know this function is available (it is not in
 * older FFTWs)
 */
#define FFTW_HAS_FPRINT_PLAN
extern void fftw_fprint_plan(FILE *f, fftw_plan plan);

/*****************************
 *    N-dimensional code
 *****************************/
typedef struct {
     int is_in_place;		/* 1 if for in-place FFTs, 0 otherwise */

     int rank;			/* 
				 * the rank (number of dimensions) of the
				 * array to be FFTed 
				 */
     int *n;			/*
				 * the dimensions of the array to the
				 * FFTed 
				 */
     fftw_direction dir;

     int *n_before;		/*
				 * n_before[i] = product of n[j] for j < i 
				 */
     int *n_after;		/* n_after[i] = product of n[j] for j > i */

     fftw_plan *plans;		/* 1d fftw plans for each dimension */

     int nbuffers, nwork;
     fftw_complex *work;	/* 
				 * work array big enough to hold
				 * nbuffers+1 of the largest dimension 
				 * (has nwork elements)
				 */
} fftwnd_data;

typedef fftwnd_data *fftwnd_plan;

/* Initializing the FFTWND plan: */
extern fftwnd_plan fftw2d_create_plan(int nx, int ny, fftw_direction dir,
				      int flags);
extern fftwnd_plan fftw3d_create_plan(int nx, int ny, int nz,
				      fftw_direction dir, int flags);
extern fftwnd_plan fftwnd_create_plan(int rank, const int *n,
				      fftw_direction dir,
				      int flags);

extern fftwnd_plan fftw2d_create_plan_specific(int nx, int ny,
					       fftw_direction dir,
					       int flags,
					   fftw_complex *in, int istride,
					 fftw_complex *out, int ostride);
extern fftwnd_plan fftw3d_create_plan_specific(int nx, int ny, int nz,
					   fftw_direction dir, int flags,
					   fftw_complex *in, int istride,
					 fftw_complex *out, int ostride);
extern fftwnd_plan fftwnd_create_plan_specific(int rank, const int *n,
					       fftw_direction dir,
					       int flags,
					   fftw_complex *in, int istride,
					 fftw_complex *out, int ostride);

/* Freeing the FFTWND plan: */
extern void fftwnd_destroy_plan(fftwnd_plan plan);

/* Printing the plan: */
extern void fftwnd_fprint_plan(FILE *f, fftwnd_plan p);
extern void fftwnd_print_plan(fftwnd_plan p);
#define FFTWND_HAS_PRINT_PLAN

/* Computing the N-Dimensional FFT */
extern void fftwnd(fftwnd_plan plan, int howmany,
		   fftw_complex *in, int istride, int idist,
		   fftw_complex *out, int ostride, int odist);
extern void fftwnd_one(fftwnd_plan p, fftw_complex *in, fftw_complex *out);

#ifdef __cplusplus
}                               /* extern "C" */

#endif				/* __cplusplus */
#endif				/* FFTW_H */