1 /** \file nifti1_io.h 2 \brief Data structures for using nifti1_io API. 3 - Written by Bob Cox, SSCC NIMH 4 - Revisions by Rick Reynolds, SSCC NIMH 5 */ 6 #ifndef _NIFTI_IO_HEADER_ 7 #define _NIFTI_IO_HEADER_ 8 9 #include <stdio.h> 10 #include <stdlib.h> 11 #include <string.h> 12 #include <math.h> 13 #include <ctype.h> 14 15 #ifndef DONT_INCLUDE_ANALYZE_STRUCT 16 #define DONT_INCLUDE_ANALYZE_STRUCT /*** not needed herein ***/ 17 #endif 18 #include "nifti1.h" /*** NIFTI-1 header specification ***/ 19 20 #include <znzlib.h> 21 22 /*=================*/ 23 #ifdef __cplusplus 24 extern "C" { 25 #endif 26 /*=================*/ 27 28 /*****===================================================================*****/ 29 /***** File nifti1_io.h == Declarations for nifti1_io.c *****/ 30 /*****...................................................................*****/ 31 /***** This code is released to the public domain. *****/ 32 /*****...................................................................*****/ 33 /***** Author: Robert W Cox, SSCC/DIRP/NIMH/NIH/DHHS/USA/EARTH *****/ 34 /***** Date: August 2003 *****/ 35 /*****...................................................................*****/ 36 /***** Neither the National Institutes of Health (NIH), nor any of its *****/ 37 /***** employees imply any warranty of usefulness of this software for *****/ 38 /***** any purpose, and do not assume any liability for damages, *****/ 39 /***** incidental or otherwise, caused by any use of this document. *****/ 40 /*****===================================================================*****/ 41 42 /* 43 Modified by: Mark Jenkinson (FMRIB Centre, University of Oxford, UK) 44 Date: July/August 2004 45 46 Mainly adding low-level IO and changing things to allow gzipped files 47 to be read and written 48 Full backwards compatability should have been maintained 49 50 Modified by: Rick Reynolds (SSCC/DIRP/NIMH, National Institutes of Health) 51 Date: December 2004 52 53 Modified and added many routines for I/O. 54 */ 55 56 /********************** Some sample data structures **************************/ 57 58 typedef struct { /** 4x4 matrix struct **/ 59 float m[4][4] ; 60 } mat44 ; 61 62 typedef struct { /** 3x3 matrix struct **/ 63 float m[3][3] ; 64 } mat33 ; 65 66 /*...........................................................................*/ 67 68 /*! \enum analyze_75_orient_code 69 * \brief Old-style analyze75 orientation 70 * codes. 71 */ 72 typedef enum _analyze75_orient_code { 73 a75_transverse_unflipped = 0, 74 a75_coronal_unflipped = 1, 75 a75_sagittal_unflipped = 2, 76 a75_transverse_flipped = 3, 77 a75_coronal_flipped = 4, 78 a75_sagittal_flipped = 5, 79 a75_orient_unknown = 6 80 } analyze_75_orient_code; 81 82 /*! \struct nifti_image 83 \brief High level data structure for open nifti datasets in the 84 nifti1_io API. Note that this structure is not part of the 85 nifti1 format definition; it is used to implement one API 86 for reading/writing formats in the nifti1 format. 87 */ 88 typedef struct { /*!< Image storage struct **/ 89 90 int ndim ; /*!< last dimension greater than 1 (1..7) */ 91 int nx ; /*!< dimensions of grid array */ 92 int ny ; /*!< dimensions of grid array */ 93 int nz ; /*!< dimensions of grid array */ 94 int nt ; /*!< dimensions of grid array */ 95 int nu ; /*!< dimensions of grid array */ 96 int nv ; /*!< dimensions of grid array */ 97 int nw ; /*!< dimensions of grid array */ 98 int dim[8] ; /*!< dim[0]=ndim, dim[1]=nx, etc. */ 99 size_t nvox ; /*!< number of voxels = nx*ny*nz*...*nw */ 100 int nbyper ; /*!< bytes per voxel, matches datatype */ 101 int datatype ; /*!< type of data in voxels: DT_* code */ 102 103 float dx ; /*!< grid spacings */ 104 float dy ; /*!< grid spacings */ 105 float dz ; /*!< grid spacings */ 106 float dt ; /*!< grid spacings */ 107 float du ; /*!< grid spacings */ 108 float dv ; /*!< grid spacings */ 109 float dw ; /*!< grid spacings */ 110 float pixdim[8] ; /*!< pixdim[1]=dx, etc. */ 111 112 float scl_slope ; /*!< scaling parameter - slope */ 113 float scl_inter ; /*!< scaling parameter - intercept */ 114 115 float cal_min ; /*!< calibration parameter, minimum */ 116 float cal_max ; /*!< calibration parameter, maximum */ 117 118 int qform_code ; /*!< codes for (x,y,z) space meaning */ 119 int sform_code ; /*!< codes for (x,y,z) space meaning */ 120 121 int freq_dim ; /*!< indexes (1,2,3, or 0) for MRI */ 122 int phase_dim ; /*!< directions in dim[]/pixdim[] */ 123 int slice_dim ; /*!< directions in dim[]/pixdim[] */ 124 125 int slice_code ; /*!< code for slice timing pattern */ 126 int slice_start ; /*!< index for start of slices */ 127 int slice_end ; /*!< index for end of slices */ 128 float slice_duration ; /*!< time between individual slices */ 129 130 /*! quaternion transform parameters 131 [when writing a dataset, these are used for qform, NOT qto_xyz] */ 132 float quatern_b , quatern_c , quatern_d , 133 qoffset_x , qoffset_y , qoffset_z , 134 qfac ; 135 136 mat44 qto_xyz ; /*!< qform: transform (i,j,k) to (x,y,z) */ 137 mat44 qto_ijk ; /*!< qform: transform (x,y,z) to (i,j,k) */ 138 139 mat44 sto_xyz ; /*!< sform: transform (i,j,k) to (x,y,z) */ 140 mat44 sto_ijk ; /*!< sform: transform (x,y,z) to (i,j,k) */ 141 142 float toffset ; /*!< time coordinate offset */ 143 144 int xyz_units ; /*!< dx,dy,dz units: NIFTI_UNITS_* code */ 145 int time_units ; /*!< dt units: NIFTI_UNITS_* code */ 146 147 int nifti_type ; /*!< 0==ANALYZE, 1==NIFTI-1 (1 file), 148 2==NIFTI-1 (2 files), 149 3==NIFTI-ASCII (1 file) */ 150 int intent_code ; /*!< statistic type (or something) */ 151 float intent_p1 ; /*!< intent parameters */ 152 float intent_p2 ; /*!< intent parameters */ 153 float intent_p3 ; /*!< intent parameters */ 154 char intent_name[16] ; /*!< optional description of intent data */ 155 156 char descrip[80] ; /*!< optional text to describe dataset */ 157 char aux_file[24] ; /*!< auxiliary filename */ 158 159 char *fname ; /*!< header filename (.hdr or .nii) */ 160 char *iname ; /*!< image filename (.img or .nii) */ 161 int iname_offset ; /*!< offset into iname where data starts */ 162 int swapsize ; /*!< swap unit in image data (might be 0) */ 163 int byteorder ; /*!< byte order on disk (MSB_ or LSB_FIRST) */ 164 void *data ; /*!< pointer to data: nbyper*nvox bytes */ 165 166 int num_ext ; /*!< number of extensions in ext_list */ 167 nifti1_extension * ext_list ; /*!< array of extension structs (with data) */ 168 analyze_75_orient_code analyze75_orient; /*!< for old analyze files, orient */ 169 170 } nifti_image ; 171 172 173 174 /* struct for return from nifti_image_read_bricks() */ 175 typedef struct { 176 int nbricks; /* the number of allocated pointers in 'bricks' */ 177 size_t bsize; /* the length of each data block, in bytes */ 178 void ** bricks; /* array of pointers to data blocks */ 179 } nifti_brick_list; 180 181 182 /*****************************************************************************/ 183 /*------------------ NIfTI version of ANALYZE 7.5 structure -----------------*/ 184 185 /* (based on fsliolib/dbh.h, but updated for version 7.5) */ 186 187 typedef struct { 188 /* header info fields - describes the header overlap with NIfTI */ 189 /* ------------------ */ 190 int sizeof_hdr; /* 0 + 4 same */ 191 char data_type[10]; /* 4 + 10 same */ 192 char db_name[18]; /* 14 + 18 same */ 193 int extents; /* 32 + 4 same */ 194 short int session_error; /* 36 + 2 same */ 195 char regular; /* 38 + 1 same */ 196 char hkey_un0; /* 39 + 1 40 bytes */ 197 198 /* image dimension fields - describes image sizes */ 199 short int dim[8]; /* 0 + 16 same */ 200 short int unused8; /* 16 + 2 intent_p1... */ 201 short int unused9; /* 18 + 2 ... */ 202 short int unused10; /* 20 + 2 intent_p2... */ 203 short int unused11; /* 22 + 2 ... */ 204 short int unused12; /* 24 + 2 intent_p3... */ 205 short int unused13; /* 26 + 2 ... */ 206 short int unused14; /* 28 + 2 intent_code */ 207 short int datatype; /* 30 + 2 same */ 208 short int bitpix; /* 32 + 2 same */ 209 short int dim_un0; /* 34 + 2 slice_start */ 210 float pixdim[8]; /* 36 + 32 same */ 211 212 float vox_offset; /* 68 + 4 same */ 213 float funused1; /* 72 + 4 scl_slope */ 214 float funused2; /* 76 + 4 scl_inter */ 215 float funused3; /* 80 + 4 slice_end, */ 216 /* slice_code, */ 217 /* xyzt_units */ 218 float cal_max; /* 84 + 4 same */ 219 float cal_min; /* 88 + 4 same */ 220 float compressed; /* 92 + 4 slice_duration */ 221 float verified; /* 96 + 4 toffset */ 222 int glmax,glmin; /* 100 + 8 108 bytes */ 223 224 /* data history fields - optional */ 225 char descrip[80]; /* 0 + 80 same */ 226 char aux_file[24]; /* 80 + 24 same */ 227 char orient; /* 104 + 1 NO GOOD OVERLAP */ 228 char originator[10]; /* 105 + 10 FROM HERE DOWN... */ 229 char generated[10]; /* 115 + 10 */ 230 char scannum[10]; /* 125 + 10 */ 231 char patient_id[10]; /* 135 + 10 */ 232 char exp_date[10]; /* 145 + 10 */ 233 char exp_time[10]; /* 155 + 10 */ 234 char hist_un0[3]; /* 165 + 3 */ 235 int views; /* 168 + 4 */ 236 int vols_added; /* 172 + 4 */ 237 int start_field; /* 176 + 4 */ 238 int field_skip; /* 180 + 4 */ 239 int omax, omin; /* 184 + 8 */ 240 int smax, smin; /* 192 + 8 200 bytes */ 241 } nifti_analyze75; /* total: 348 bytes */ 242 243 244 /*****************************************************************************/ 245 /*--------------- Prototypes of functions defined in this file --------------*/ 246 247 char *nifti_datatype_string ( int dt ) ; 248 char *nifti_units_string ( int uu ) ; 249 char *nifti_intent_string ( int ii ) ; 250 char *nifti_xform_string ( int xx ) ; 251 char *nifti_slice_string ( int ss ) ; 252 char *nifti_orientation_string( int ii ) ; 253 254 int nifti_is_inttype( int dt ) ; 255 256 mat44 nifti_mat44_inverse( mat44 R ) ; 257 258 mat33 nifti_mat33_inverse( mat33 R ) ; 259 mat33 nifti_mat33_polar ( mat33 A ) ; 260 float nifti_mat33_rownorm( mat33 A ) ; 261 float nifti_mat33_colnorm( mat33 A ) ; 262 float nifti_mat33_determ ( mat33 R ) ; 263 mat33 nifti_mat33_mul ( mat33 A , mat33 B ) ; 264 265 void nifti_swap_2bytes ( size_t n , void *ar ) ; 266 void nifti_swap_4bytes ( size_t n , void *ar ) ; 267 void nifti_swap_8bytes ( size_t n , void *ar ) ; 268 void nifti_swap_16bytes( size_t n , void *ar ) ; 269 void nifti_swap_Nbytes ( size_t n , int siz , void *ar ) ; 270 271 int nifti_datatype_is_valid (int dtype, int for_nifti); 272 int nifti_datatype_from_string(const char * name); 273 char * nifti_datatype_to_string (int dtype); 274 275 int nifti_get_filesize( const char *pathname ) ; 276 void swap_nifti_header ( struct nifti_1_header *h , int is_nifti ) ; 277 void old_swap_nifti_header( struct nifti_1_header *h , int is_nifti ); 278 int nifti_swap_as_analyze( nifti_analyze75 *h ); 279 280 281 /* main read/write routines */ 282 283 nifti_image *nifti_image_read_bricks(const char *hname , int nbricks, 284 const int *blist, nifti_brick_list * NBL); 285 int nifti_image_load_bricks(nifti_image *nim , int nbricks, 286 const int *blist, nifti_brick_list * NBL); 287 void nifti_free_NBL( nifti_brick_list * NBL ); 288 289 nifti_image *nifti_image_read ( const char *hname , int read_data ) ; 290 int nifti_image_load ( nifti_image *nim ) ; 291 void nifti_image_unload ( nifti_image *nim ) ; 292 void nifti_image_free ( nifti_image *nim ) ; 293 294 int nifti_read_collapsed_image( nifti_image * nim, const int dims [8], 295 void ** data ); 296 297 int nifti_read_subregion_image( nifti_image * nim, 298 int *start_index, int *region_size, 299 void ** data ); 300 301 void nifti_image_write ( nifti_image * nim ) ; 302 void nifti_image_write_bricks(nifti_image * nim, 303 const nifti_brick_list * NBL); 304 void nifti_image_infodump( const nifti_image * nim ) ; 305 306 void nifti_disp_lib_hist( void ) ; /* to display library history */ 307 void nifti_disp_lib_version( void ) ; /* to display library version */ 308 int nifti_disp_matrix_orient( const char * mesg, mat44 mat ); 309 int nifti_disp_type_list( int which ); 310 311 312 char * nifti_image_to_ascii ( const nifti_image * nim ) ; 313 nifti_image *nifti_image_from_ascii( const char * str, int * bytes_read ) ; 314 315 size_t nifti_get_volsize(const nifti_image *nim) ; 316 317 /* basic file operations */ 318 int nifti_set_filenames(nifti_image * nim, const char * prefix, int check, 319 int set_byte_order); 320 char * nifti_makehdrname (const char * prefix, int nifti_type, int check, 321 int comp); 322 char * nifti_makeimgname (const char * prefix, int nifti_type, int check, 323 int comp); 324 int is_nifti_file (const char *hname); 325 char * nifti_find_file_extension(const char * name); 326 int nifti_is_complete_filename(const char* fname); 327 int nifti_validfilename(const char* fname); 328 329 int disp_nifti_1_header(const char * info, const nifti_1_header * hp ) ; 330 void nifti_set_debug_level( int level ) ; 331 void nifti_set_skip_blank_ext( int skip ) ; 332 void nifti_set_allow_upper_fext( int allow ) ; 333 334 int valid_nifti_brick_list(nifti_image * nim , int nbricks, 335 const int * blist, int disp_error); 336 337 /* znzFile operations */ 338 znzFile nifti_image_open(const char * hname, char * opts, nifti_image ** nim); 339 znzFile nifti_image_write_hdr_img(nifti_image *nim, int write_data, 340 const char* opts); 341 znzFile nifti_image_write_hdr_img2( nifti_image *nim , int write_opts , 342 const char* opts, znzFile imgfile, const nifti_brick_list * NBL); 343 size_t nifti_read_buffer(znzFile fp, void* datatptr, size_t ntot, 344 nifti_image *nim); 345 int nifti_write_all_data(znzFile fp, nifti_image * nim, 346 const nifti_brick_list * NBL); 347 size_t nifti_write_buffer(znzFile fp, const void * buffer, size_t numbytes); 348 nifti_image *nifti_read_ascii_image(znzFile fp, char *fname, int flen, 349 int read_data); 350 znzFile nifti_write_ascii_image(nifti_image *nim, const nifti_brick_list * NBL, 351 const char * opts, int write_data, int leave_open); 352 353 354 void nifti_datatype_sizes( int datatype , int *nbyper, int *swapsize ) ; 355 356 void nifti_mat44_to_quatern( mat44 R , 357 float *qb, float *qc, float *qd, 358 float *qx, float *qy, float *qz, 359 float *dx, float *dy, float *dz, float *qfac ) ; 360 361 mat44 nifti_quatern_to_mat44( float qb, float qc, float qd, 362 float qx, float qy, float qz, 363 float dx, float dy, float dz, float qfac ); 364 365 mat44 nifti_make_orthog_mat44( float r11, float r12, float r13 , 366 float r21, float r22, float r23 , 367 float r31, float r32, float r33 ) ; 368 369 int nifti_short_order(void) ; /* CPU byte order */ 370 371 372 /* Orientation codes that might be returned from nifti_mat44_to_orientation().*/ 373 374 #define NIFTI_L2R 1 /* Left to Right */ 375 #define NIFTI_R2L 2 /* Right to Left */ 376 #define NIFTI_P2A 3 /* Posterior to Anterior */ 377 #define NIFTI_A2P 4 /* Anterior to Posterior */ 378 #define NIFTI_I2S 5 /* Inferior to Superior */ 379 #define NIFTI_S2I 6 /* Superior to Inferior */ 380 381 void nifti_mat44_to_orientation( mat44 R , int *icod, int *jcod, int *kcod ) ; 382 383 /*--------------------- Low level IO routines ------------------------------*/ 384 385 char * nifti_findhdrname (const char* fname); 386 char * nifti_findimgname (const char* fname , int nifti_type); 387 int nifti_is_gzfile (const char* fname); 388 389 char * nifti_makebasename(const char* fname); 390 391 392 /* other routines */ 393 struct nifti_1_header nifti_convert_nim2nhdr(const nifti_image* nim); 394 nifti_1_header * nifti_make_new_header(const int arg_dims[], int arg_dtype); 395 nifti_1_header * nifti_read_header(const char *hname, int *swapped, int check); 396 nifti_image * nifti_copy_nim_info(const nifti_image * src); 397 nifti_image * nifti_make_new_nim(const int dims[], int datatype, 398 int data_fill); 399 nifti_image * nifti_simple_init_nim(void); 400 nifti_image * nifti_convert_nhdr2nim(struct nifti_1_header nhdr, 401 const char * fname); 402 403 int nifti_hdr_looks_good (const nifti_1_header * hdr); 404 int nifti_is_valid_datatype (int dtype); 405 int nifti_is_valid_ecode (int ecode); 406 int nifti_nim_is_valid (nifti_image * nim, int complain); 407 int nifti_nim_has_valid_dims (nifti_image * nim, int complain); 408 int is_valid_nifti_type (int nifti_type); 409 int nifti_test_datatype_sizes (int verb); 410 int nifti_type_and_names_match (nifti_image * nim, int show_warn); 411 int nifti_update_dims_from_array(nifti_image * nim); 412 void nifti_set_iname_offset (nifti_image *nim); 413 int nifti_set_type_from_names (nifti_image * nim); 414 int nifti_add_extension(nifti_image * nim, const char * data, int len, 415 int ecode ); 416 int nifti_compiled_with_zlib (void); 417 int nifti_copy_extensions (nifti_image *nim_dest,const nifti_image *nim_src); 418 int nifti_free_extensions (nifti_image *nim); 419 int * nifti_get_intlist (int nvals , const char *str); 420 char * nifti_strdup (const char *str); 421 int valid_nifti_extensions(const nifti_image *nim); 422 423 424 /*-------------------- Some C convenience macros ----------------------------*/ 425 426 /* NIfTI-1.1 extension codes: 427 see http://nifti.nimh.nih.gov/nifti-1/documentation/faq#Q21 */ 428 429 #define NIFTI_ECODE_IGNORE 0 /* changed from UNKNOWN, 29 June 2005 */ 430 431 #define NIFTI_ECODE_DICOM 2 /* intended for raw DICOM attributes */ 432 433 #define NIFTI_ECODE_AFNI 4 /* Robert W Cox: rwcox@nih.gov 434 http://afni.nimh.nih.gov/afni */ 435 436 #define NIFTI_ECODE_COMMENT 6 /* plain ASCII text only */ 437 438 #define NIFTI_ECODE_XCEDE 8 /* David B Keator: dbkeator@uci.edu 439 http://www.nbirn.net/Resources 440 /Users/Applications/ 441 /xcede/index.htm */ 442 443 #define NIFTI_ECODE_JIMDIMINFO 10 /* Mark A Horsfield: 444 mah5@leicester.ac.uk 445 http://someplace/something */ 446 447 #define NIFTI_ECODE_WORKFLOW_FWDS 12 /* Kate Fissell: fissell@pitt.edu 448 http://kraepelin.wpic.pitt.edu 449 /~fissell/NIFTI_ECODE_WORKFLOW_FWDS 450 /NIFTI_ECODE_WORKFLOW_FWDS.html */ 451 452 #define NIFTI_ECODE_FREESURFER 14 /* http://surfer.nmr.mgh.harvard.edu */ 453 454 #define NIFTI_ECODE_PYPICKLE 16 /* embedded Python objects 455 http://niftilib.sourceforge.net 456 /pynifti */ 457 458 /* LONI MiND codes: http://www.loni.ucla.edu/twiki/bin/view/Main/MiND */ 459 #define NIFTI_ECODE_MIND_IDENT 18 /* Vishal Patel: vishal.patel@ucla.edu*/ 460 #define NIFTI_ECODE_B_VALUE 20 461 #define NIFTI_ECODE_SPHERICAL_DIRECTION 22 462 #define NIFTI_ECODE_DT_COMPONENT 24 463 #define NIFTI_ECODE_SHC_DEGREEORDER 26 /* end LONI MiND codes */ 464 465 #define NIFTI_ECODE_VOXBO 28 /* Dan Kimberg: www.voxbo.org */ 466 467 #define NIFTI_ECODE_CARET 30 /* John Harwell: john@brainvis.wustl.edu 468 http://brainvis.wustl.edu/wiki 469 /index.php/Caret:Documentation 470 :CaretNiftiExtension */ 471 472 #define NIFTI_MAX_ECODE 30 /******* maximum extension code *******/ 473 474 /* nifti_type file codes */ 475 #define NIFTI_FTYPE_ANALYZE 0 476 #define NIFTI_FTYPE_NIFTI1_1 1 477 #define NIFTI_FTYPE_NIFTI1_2 2 478 #define NIFTI_FTYPE_ASCII 3 479 #define NIFTI_MAX_FTYPE 3 /* this should match the maximum code */ 480 481 /*------------------------------------------------------------------------*/ 482 /*-- the rest of these apply only to nifti1_io.c, check for _NIFTI1_IO_C_ */ 483 /* Feb 9, 2005 [rickr] */ 484 #ifdef _NIFTI1_IO_C_ 485 486 typedef struct { 487 int debug; /*!< debug level for status reports */ 488 int skip_blank_ext; /*!< skip extender if no extensions */ 489 int allow_upper_fext; /*!< allow uppercase file extensions */ 490 } nifti_global_options; 491 492 typedef struct { 493 int type; /* should match the NIFTI_TYPE_ #define */ 494 int nbyper; /* bytes per value, matches nifti_image */ 495 int swapsize; /* bytes per swap piece, matches nifti_image */ 496 char * name; /* text string to match #define */ 497 } nifti_type_ele; 498 499 #undef LNI_FERR /* local nifti file error, to be compact and repetative */ 500 #define LNI_FERR(func,msg,file) \ 501 fprintf(stderr,"** ERROR (%s): %s '%s'\n",func,msg,file) 502 503 #undef swap_2 504 #undef swap_4 505 #define swap_2(s) nifti_swap_2bytes(1,&(s)) /* s: 2-byte short; swap in place */ 506 #define swap_4(v) nifti_swap_4bytes(1,&(v)) /* v: 4-byte value; swap in place */ 507 508 /***** isfinite() is a C99 macro, which is 509 present in many C implementations already *****/ 510 511 #undef IS_GOOD_FLOAT 512 #undef FIXED_FLOAT 513 514 #ifdef isfinite /* use isfinite() to check floats/doubles for goodness */ 515 # define IS_GOOD_FLOAT(x) isfinite(x) /* check if x is a "good" float */ 516 # define FIXED_FLOAT(x) (isfinite(x) ? (x) : 0) /* fixed if bad */ 517 #else 518 # define IS_GOOD_FLOAT(x) 1 /* don't check it */ 519 # define FIXED_FLOAT(x) (x) /* don't fix it */ 520 #endif 521 522 #undef ASSIF /* assign v to *p, if possible */ 523 #define ASSIF(p,v) if( (p)!=NULL ) *(p) = (v) 524 525 #undef MSB_FIRST 526 #undef LSB_FIRST 527 #undef REVERSE_ORDER 528 #define LSB_FIRST 1 529 #define MSB_FIRST 2 530 #define REVERSE_ORDER(x) (3-(x)) /* convert MSB_FIRST <--> LSB_FIRST */ 531 532 #define LNI_MAX_NIA_EXT_LEN 100000 /* consider a longer extension invalid */ 533 534 #endif /* _NIFTI1_IO_C_ section */ 535 /*------------------------------------------------------------------------*/ 536 537 /*=================*/ 538 #ifdef __cplusplus 539 } 540 #endif 541 /*=================*/ 542 543 #endif /* _NIFTI_IO_HEADER_ */ 544