1 /*=========================================================================
4 Module: $RCSfile: gdcmFile.cxx,v $
6 Date: $Date: 2006/06/08 13:37:33 $
7 Version: $Revision: 1.321 $
9 Copyright (c) CREATIS (Centre de Recherche et d'Applications en Traitement de
10 l'Image). All rights reserved. See Doc/License.txt or
11 http://www.creatis.insa-lyon.fr/Public/Gdcm/License.html for details.
13 This software is distributed WITHOUT ANY WARRANTY; without even
14 the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
15 PURPOSE. See the above copyright notices for more information.
17 =========================================================================*/
20 // -------------- Remember ! ----------------------------------
22 // Image Position (Patient) (0020,0032):
23 // If not found (ACR_NEMA) we try Image Position (0020,0030)
24 // If not found (ACR-NEMA), we consider Slice Location (0020,1041)
25 // or Location (0020,0050)
26 // as the Z coordinate,
27 // 0. for all the coordinates if nothing is found
29 // Image Position (Patient) (0020,0032) VM=3
31 // The attribute Patient Orientation (0020,0020) from the General Image Module
32 // is of type 2C and has the condition Required if image does not require
33 // Image Orientation (0020,0037) and Image Position (0020,0032).
34 // However, if the image does require the attributes
35 // - Image Orientation (Patient) (0020,0037), VM=6
36 // - Image Position (Patient) (0020,0032), VM=3
37 // then attribute Patient Orientation (0020,0020) should not be present
41 // Patient Position (0018,5100) values :
43 // HFS = Head First-Supine, where increasing (positive axis direction) :
44 // X -> to the direction pointed to by the patient's oustretched left arm
45 // Y -> to the anterior-to-posterior direction in the patient's body
46 // Z -> to the feet-to-head direction in the patient's body
48 // HFP = Head First-Prone, where increasing (positive axis direction) :
49 // X -> to the direction pointed to by the patient's oustretched left arm
50 // Y -> to the anterior-to-posterior direction in the patient's body
51 // Z -> to the feet-to-head direction in the patient's body
53 // FFS = Feet First-Supine, where increasing (positive axis direction) :
54 // X -> to the direction pointed to by the patient's oustretched left arm
55 // Y -> to the anterior-to-posterion direction in the patient's body
56 // Z -> to the feet-to-head direction in the patient's body
58 // FFP = Feet First-Prone, where increasing (positive axis direction) :
59 // X -> to the direction pointed to by the patient's oustretched left arm
60 // Y -> to the posterior-to-anterior direction in the patient's body
61 // Z -> to the feet-to-head direction in the patient's body
63 // HFDR = Head First-Decubitus Right
64 // HFDL = Head First-Decubitus Left
65 // FFDR = Feet First-Decubitus Right
66 // FFDL = Feet First-Decubitus Left
68 // we can also find (non standard!)
73 // CS 2 Patient Orientation (0020 0020)
74 // When the coordinates of the image
75 // are always present, this field is almost never used.
76 // Better we don't trust it too much ...
85 // (0020|0037) [Image Orientation (Patient)] [1\0\0\0\1\0 ]
88 // ---------------------------------------------------------------
91 #include "gdcmGlobal.h"
93 #include "gdcmDebug.h"
95 #include "gdcmSeqEntry.h"
96 #include "gdcmRLEFramesInfo.h"
97 #include "gdcmJPEGFragmentsInfo.h"
98 #include "gdcmDataEntry.h"
101 #include <stdio.h> //sscanf
102 #include <stdlib.h> // for atoi
107 //-----------------------------------------------------------------------------
108 // Constructor / Destructor
111 * \brief Constructor used when we want to generate dicom files from scratch
116 RLEInfo = new RLEFramesInfo;
117 JPEGInfo = new JPEGFragmentsInfo;
118 GrPixel = 0x7fe0; // to avoid further troubles
120 BasicOffsetTableItemValue = 0;
121 FourthDimensionLocation = TagKey(0,0);
126 * \brief Canonical destructor.
134 delete[] BasicOffsetTableItemValue;
137 //-----------------------------------------------------------------------------
141 * @return false if file cannot be open or no swap info was found,
142 * or no tag was found.
146 if ( ! this->Document::Load( ) )
149 return DoTheLoadingJob( );
153 * \brief Does the Loading Job (internal use only)
154 * @return false if file cannot be open or no swap info was found,
155 * or no tag was found.
157 bool File::DoTheLoadingJob( )
159 // for some ACR-NEMA images GrPixel, NumPixel is *not* 7fe0,0010
160 // We may encounter the 'RETired' (0x0028, 0x0200) tag
161 // (Image Location") . This entry contains the number of
162 // the group that contains the pixel data (hence the "Pixel Data"
163 // is found by indirection through the "Image Location").
164 // Inside the group pointed by "Image Location" the searched element
165 // is conventionally the element 0x0010 (when the norm is respected).
166 // When the "Image Location" is missing we default to group 0x7fe0.
167 // Note: this IS the right place for the code
170 const std::string &imgLocation = GetEntryString(0x0028, 0x0200);
171 if ( imgLocation == GDCM_UNFOUND )
178 GrPixel = (uint16_t) atoi( imgLocation.c_str() );
181 // sometimes Image Location value doesn't follow
182 // the supposed processor endianness.
183 // see gdcmData/cr172241.dcm
184 if ( GrPixel == 0xe07f )
189 if ( GrPixel != 0x7fe0 )
191 // This is a kludge for old dirty Philips imager.
199 // Now, we know GrPixel and NumPixel.
200 // Let's create a VirtualDictEntry to allow a further VR modification
201 // and force VR to match with BitsAllocated.
202 DocEntry *entry = GetDocEntry(GrPixel, NumPixel);
205 // Compute the RLE or JPEG info
207 const std::string &ts = GetTransferSyntax();
208 Fp->seekg( entry->GetOffset(), std::ios::beg );
209 if ( Global::GetTS()->IsRLELossless(ts) )
211 else if ( Global::GetTS()->IsJPEG(ts) )
212 ComputeJPEGFragmentInfo();
215 // Create a new DataEntry to change the DictEntry
216 // The changed DictEntry will have
217 // - a correct PixelVR OB or OW)
218 // - the name to "Pixel Data"
221 //==> Just change the VR !
224 DataEntry *oldEntry = dynamic_cast<DataEntry *>(entry);
228 // 8 bits allocated is a 'O Bytes' , as well as 24 (old ACR-NEMA RGB)
229 // more than 8 (i.e 12, 16) is a 'O Words'
230 if ( GetBitsAllocated() == 8 || GetBitsAllocated() == 24 )
235 // Change only made if usefull
236 if ( PixelVR != oldEntry->GetVR() )
238 //DictEntry* newDict = DictEntry::New(GrPixel,NumPixel,
239 // PixelVR,"1","Pixel Data");
240 //DataEntry *newEntry = DataEntry::New(newDict);
242 //newEntry->Copy(entry);
243 //newEntry->SetBinArea(oldEntry->GetBinArea(),oldEntry->IsSelfArea());
244 //oldEntry->SetSelfArea(false);
246 //RemoveEntry(oldEntry);
247 //AddEntry(newEntry);
248 //newEntry->Delete();
254 // 8 bits allocated is a 'OB(ytes)' , as well as 24 (old ACR-NEMA RGB)
255 // more than 8 (i.e 12, 16) is a 'OW(ords)'
256 if ( GetBitsAllocated() == 8 || GetBitsAllocated() == 24 )
260 // Change only made if usefull
261 if ( PixelVR != entry->GetVR() )
263 entry->SetVR(PixelVR);
270 * \brief This predicate, based on hopefully reasonable heuristics,
271 * decides whether or not the current File was properly parsed
272 * and contains the mandatory information for being considered as
273 * a well formed and usable Dicom/Acr File.
274 * @return true when File is the one of a reasonable Dicom/Acr file,
277 bool File::IsReadable()
279 if ( !Document::IsReadable() )
284 const std::string &res = GetEntryString(0x0028, 0x0005);
285 if ( res != GDCM_UNFOUND && atoi(res.c_str()) > 4 )
287 gdcmWarningMacro("Wrong Image Dimensions" << res);
288 return false; // Image Dimensions
290 bool b0028_0100 = true;
291 if ( !GetDocEntry(0x0028, 0x0100) )
293 gdcmWarningMacro("Bits Allocated (0028|0100) not found");
294 //return false; // "Bits Allocated"
297 bool b0028_0101 = true;
298 if ( !GetDocEntry(0x0028, 0x0101) )
300 gdcmWarningMacro("Bits Stored (0028|0101) not found");
301 //return false; // "Bits Stored"
304 bool b0028_0102 = true;
305 if ( !GetDocEntry(0x0028, 0x0102) )
307 gdcmWarningMacro("Hight Bit (0028|0102) not found");
308 //return false; // "High Bit"
311 bool b0028_0103 = true;
312 if ( !GetDocEntry(0x0028, 0x0103) )
314 gdcmWarningMacro("Pixel Representation (0028|0103) not found");
315 //return false; // "Pixel Representation" i.e. 'Sign' ( 0 : unsigned, 1 : signed)
319 if ( !b0028_0100 && !b0028_0101 && !b0028_0102 && !b0028_0103)
321 gdcmWarningMacro("Too much mandatory Tags missing !");
325 if ( !GetDocEntry(GrPixel, NumPixel) )
327 gdcmWarningMacro("Pixel Dicom Element " << std::hex <<
328 GrPixel << "|" << NumPixel << "not found");
329 return false; // Pixel Dicom Element not found :-(
335 * \brief gets the info from 0020,0013 : Image Number else 0.
336 * @return image number
338 int File::GetImageNumber()
340 //0020 0013 : Image Number
341 std::string strImNumber = GetEntryString(0x0020,0x0013);
342 if ( strImNumber != GDCM_UNFOUND )
344 return atoi( strImNumber.c_str() );
350 * \brief gets the info from 0008,0060 : Modality
351 * @return Modality Type
353 ModalityType File::GetModality()
355 // 0008 0060 : Modality
356 std::string strModality = GetEntryString(0x0008,0x0060);
357 if ( strModality != GDCM_UNFOUND )
359 if ( strModality.find("AU") < strModality.length()) return AU;
360 else if ( strModality.find("AS") < strModality.length()) return AS;
361 else if ( strModality.find("BI") < strModality.length()) return BI;
362 else if ( strModality.find("CF") < strModality.length()) return CF;
363 else if ( strModality.find("CP") < strModality.length()) return CP;
364 else if ( strModality.find("CR") < strModality.length()) return CR;
365 else if ( strModality.find("CT") < strModality.length()) return CT;
366 else if ( strModality.find("CS") < strModality.length()) return CS;
367 else if ( strModality.find("DD") < strModality.length()) return DD;
368 else if ( strModality.find("DF") < strModality.length()) return DF;
369 else if ( strModality.find("DG") < strModality.length()) return DG;
370 else if ( strModality.find("DM") < strModality.length()) return DM;
371 else if ( strModality.find("DS") < strModality.length()) return DS;
372 else if ( strModality.find("DX") < strModality.length()) return DX;
373 else if ( strModality.find("ECG") < strModality.length()) return ECG;
374 else if ( strModality.find("EPS") < strModality.length()) return EPS;
375 else if ( strModality.find("FA") < strModality.length()) return FA;
376 else if ( strModality.find("FS") < strModality.length()) return FS;
377 else if ( strModality.find("HC") < strModality.length()) return HC;
378 else if ( strModality.find("HD") < strModality.length()) return HD;
379 else if ( strModality.find("LP") < strModality.length()) return LP;
380 else if ( strModality.find("LS") < strModality.length()) return LS;
381 else if ( strModality.find("MA") < strModality.length()) return MA;
382 else if ( strModality.find("MR") < strModality.length()) return MR;
383 else if ( strModality.find("NM") < strModality.length()) return NM;
384 else if ( strModality.find("OT") < strModality.length()) return OT;
385 else if ( strModality.find("PT") < strModality.length()) return PT;
386 else if ( strModality.find("RF") < strModality.length()) return RF;
387 else if ( strModality.find("RG") < strModality.length()) return RG;
388 else if ( strModality.find("RTDOSE")
389 < strModality.length()) return RTDOSE;
390 else if ( strModality.find("RTIMAGE")
391 < strModality.length()) return RTIMAGE;
392 else if ( strModality.find("RTPLAN")
393 < strModality.length()) return RTPLAN;
394 else if ( strModality.find("RTSTRUCT")
395 < strModality.length()) return RTSTRUCT;
396 else if ( strModality.find("SM") < strModality.length()) return SM;
397 else if ( strModality.find("ST") < strModality.length()) return ST;
398 else if ( strModality.find("TG") < strModality.length()) return TG;
399 else if ( strModality.find("US") < strModality.length()) return US;
400 else if ( strModality.find("VF") < strModality.length()) return VF;
401 else if ( strModality.find("XA") < strModality.length()) return XA;
402 else if ( strModality.find("XC") < strModality.length()) return XC;
406 /// \todo throw error return value ???
407 /// specified <> unknown in our database
415 * \brief Retrieve the number of columns of image.
416 * @return The encountered size when found, 0 by default.
417 * 0 means the file is NOT USABLE. The caller will have to check
421 DataEntry *entry = GetDataEntry(0x0028,0x0011);
423 return (int)entry->GetValue(0);
428 * \brief Retrieve the number of lines of image.
429 * \warning The defaulted value is 1 as opposed to File::GetXSize()
430 * @return The encountered size when found, 1 by default
431 * (The ACR-NEMA file contains a Signal, not an Image).
435 DataEntry *entry = GetDataEntry(0x0028,0x0010);
437 return (int)entry->GetValue(0);
444 // The Rows (0028,0010) entry was optional for ACR/NEMA.
445 // (at least some images didn't have it.)
446 // It might hence be a signal (1D image). So we default to 1:
451 * \brief Retrieve the number of planes of volume or the number
452 * of frames of a multiframe.
453 * \warning When present we consider the "Number of Frames" as the third
454 * dimension. When missing we consider the third dimension as
455 * being the ACR-NEMA "Planes" tag content.
456 * @return The encountered size when found, 1 by default (single image).
460 // Both DicomV3 and ACR/Nema consider the "Number of Frames"
461 // as the third dimension.
462 DataEntry *entry = GetDataEntry(0x0028,0x0008);
464 return (int)entry->GetValue(0);
466 // We then consider the "Planes" entry as the third dimension
467 entry = GetDataEntry(0x0028,0x0012);
469 return (int)entry->GetValue(0);
474 * \brief Retrieve the -unnormalized- number of 'times' of '4D image'.
475 * User has to tell gdcm the location of this '4th Dimension component'
476 * using SetFourthDimensionLocation() method before.
477 * \warning The defaulted value is 1.
478 * @return The encountered size when found, 1 by default
479 * (The file doesn't contain a '4D image'.).
483 if (FourthDimensionLocation == TagKey(0,0) )// 4D location is not set : not a 4D object
486 DataEntry *entry = GetDataEntry(FourthDimensionLocation.GetGroup(),
487 FourthDimensionLocation.GetElement() );
490 gdcmWarningMacro( " FourthDimensionLocation not found at : " <<
491 std::hex << FourthDimensionLocation.GetGroup()
492 << "|" << FourthDimensionLocation.GetElement());
497 return (int)entry->GetValue(0);
502 * \brief gets the info from 0018,1164 : ImagerPixelSpacing
503 * then 0028,0030 : Pixel Spacing
505 * @return X dimension of a pixel
507 float File::GetXSpacing()
509 float xspacing = 1.0;
513 It *SHOULD* first find the IOD and then deduce which tags to read
514 Eg: Cross section this is in Pixel Spacing (0028,0030)
515 CR is in Imager Pixel Spacing (0018,1164)
516 US is in Pixel Ratio (0028,0034)
518 (3002,0011) Image Plane Pixel Spacing
519 (3002,0012) RT Image Position
521 (3004,000c) for deducing Z spacing
525 // std::string SOPClassUID = GetEntryString(0x0008,0x0016);
527 /// \todo check the various SOP Class
528 /// to get the Pixel Spacing at the proper location
531 // Ultrasound Image Storage (Retired)
533 if (Util::DicomStringEqual( SOPClassUID,"1.2.840.10008.5.1.4.1.1.6")
535 - check if SOPClassUID contains 2 parts (e.g. "4\3")
536 - guess how to deduce the spacing (FOV ?, ??)
539 // go on with old method ...
542 // To follow David Clunie's advice, we first check ImagerPixelSpacing
544 DataEntry *entry = GetDataEntry(0x0018,0x1164);
547 nbValue = entry->GetValueCount();
548 // Can't use IsValueCountValid because of the complex heuristic.
550 gdcmWarningMacro("ImagerPixelSpacing (0x0018,0x1164) "
551 << "has a wrong number of values :" << nbValue);
554 xspacing = (float)entry->GetValue(2);
555 else if( nbValue >= 2 )
556 xspacing = (float)entry->GetValue(1);
558 xspacing = (float)entry->GetValue(0);
560 if ( xspacing == 0.0 )
566 gdcmWarningMacro( "Unfound Imager Pixel Spacing (0018,1164)" );
569 entry = GetDataEntry(0x0028,0x0030);
572 nbValue = entry->GetValueCount();
574 gdcmWarningMacro("PixelSpacing (0x0018,0x0030) "
575 << "has a wrong number of values :" << nbValue);
578 xspacing = (float)entry->GetValue(2);
579 else if( nbValue >= 2 )
580 xspacing = (float)entry->GetValue(1);
582 xspacing = (float)entry->GetValue(0);
584 if ( xspacing == 0.0 )
590 gdcmWarningMacro( "Unfound Pixel Spacing (0028,0030)" );
596 * \brief gets the info from 0018,1164 : ImagerPixelSpacing
597 * then from 0028,0030 : Pixel Spacing
599 * @return Y dimension of a pixel
601 float File::GetYSpacing()
603 float yspacing = 1.0;
604 // To follow David Clunie's advice, we first check ImagerPixelSpacing
606 DataEntry *entry = GetDataEntry(0x0018,0x1164);
609 yspacing = (float)entry->GetValue(0);
611 if ( yspacing == 0.0 )
617 gdcmWarningMacro( "Unfound Imager Pixel Spacing (0018,1164)" );
620 entry = GetDataEntry(0x0028,0x0030);
623 yspacing = (float)entry->GetValue(0);
625 if ( yspacing == 0.0 )
631 gdcmWarningMacro( "Unfound Pixel Spacing (0028,0030)" );
638 * \brief gets the info from 0018,0088 : Space Between Slices
639 * else from 0018,0050 : Slice Thickness
642 * When an element is missing, we suppose slices join together
643 * (no overlapping, no interslice gap) but we have no way to check it !
644 * For *Dicom* images, ZSpacing *should be* calculated using
645 * XOrigin, YOrigin, ZOrigin (of the top left image corner)
646 * of 2 consecutive images, and the Orientation
647 * Computing ZSpacing on a single image is not really meaningfull !
648 * @return Z dimension of a voxel-to be
650 float File::GetZSpacing()
653 float zspacing = 1.0f;
655 // Spacing Between Slices : distance between the middle of 2 slices
657 // jointives (Spacing between Slices = Slice Thickness)
658 // overlapping (Spacing between Slices < Slice Thickness)
659 // disjointes (Spacing between Slices > Slice Thickness)
660 // Slice Thickness : epaisseur de tissus sur laquelle est acquis le signal
661 // It only concerns the MRI guys, not people wanting to visualize volumes
662 // If Spacing Between Slices is missing,
663 // we suppose slices joint together
664 DataEntry *entry = GetDataEntry(0x0018,0x0088);
667 zspacing = (float)entry->GetValue(0);
669 if ( zspacing == 0.0 )
674 gdcmWarningMacro("Unfound Spacing Between Slices (0018,0088)");
676 // if no 'Spacing Between Slices' is found,
677 // we assume slices join together
678 // (no overlapping, no interslice gap)
679 entry = GetDataEntry(0x0018,0x0050);
682 zspacing = (float)entry->GetValue(0);
684 if ( zspacing == 0.0 )
689 gdcmWarningMacro("Unfound Slice Thickness (0018,0050)");
691 // if no 'Spacing Between Slices' is found,
692 // we assume slices join together
693 // (no overlapping, no interslice gap)
694 entry = GetDataEntry(0x3004,0x000c);
697 float z1 = (float)entry->GetValue(0);
698 float z2 = (float)entry->GetValue(1);
699 zspacing = z2 - z1; // can be negative...
701 if ( zspacing == 0.0 )
710 * \brief gets the info from 0020,0032 : Image Position Patient
711 * else from 0020,0030 : Image Position (RET)
713 * @return up-left image corner X position
715 float File::GetXOrigin()
717 DataEntry *entry = GetDataEntry(0x0020,0x0032);
720 gdcmWarningMacro( "Unfound Image Position Patient (0020,0032)");
721 entry = GetDataEntry(0x0020,0x0030);
724 gdcmWarningMacro( "Unfound Image Position (RET) (0020,0030)");
729 if( entry->GetValueCount() == 3 )
731 if (!entry->IsValueCountValid() )
733 gdcmErrorMacro( "Invalid Value Count" );
735 return (float)entry->GetValue(0);
741 * \brief gets the info from 0020,0032 : Image Position Patient
742 * else from 0020,0030 : Image Position (RET)
744 * @return up-left image corner Y position
746 float File::GetYOrigin()
748 DataEntry *entry = GetDataEntry(0x0020,0x0032);
751 gdcmWarningMacro( "Unfound Image Position Patient (0020,0032)");
752 entry = GetDataEntry(0x0020,0x0030);
755 gdcmWarningMacro( "Unfound Image Position (RET) (0020,0030)");
760 if( entry->GetValueCount() == 3 )
762 if (!entry->IsValueCountValid() )
764 gdcmErrorMacro( "Invalid Value Count" );
766 return (float)entry->GetValue(1);
772 * \brief gets the info from 0020,0032 : Image Position Patient
773 * else from 0020,0030 : Image Position (RET)
774 * else from 0020,1041 : Slice Location
775 * else from 0020,0050 : Location
777 * @return up-left image corner Z position
779 float File::GetZOrigin()
781 DataEntry *entry = GetDataEntry(0x0020,0x0032);
784 if( entry->GetValueCount() == 3 )
786 if (!entry->IsValueCountValid() )
788 gdcmErrorMacro( "Invalid Value Count" );
790 return (float)entry->GetValue(2);
792 gdcmWarningMacro( "Wrong Image Position Patient (0020,0032)");
796 entry = GetDataEntry(0x0020,0x0030);
799 if( entry->GetValueCount() == 3 )
801 if (!entry->IsValueCountValid() )
803 gdcmErrorMacro( "Invalid Value Count" );
805 return (float)entry->GetValue(2);
807 gdcmWarningMacro( "Wrong Image Position (RET) (0020,0030)");
811 // for *very* old ACR-NEMA images
812 entry = GetDataEntry(0x0020,0x1041);
815 if( entry->GetValueCount() == 1 )
817 if (!entry->IsValueCountValid() )
819 gdcmErrorMacro( "Invalid Value Count" );
821 return (float)entry->GetValue(0); // VM=1 !
823 gdcmWarningMacro( "Wrong Slice Location (0020,1041)");
827 entry = GetDataEntry(0x0020,0x0050);
830 if( entry->GetValueCount() == 1 )
832 if (!entry->IsValueCountValid() )
834 gdcmErrorMacro( "Invalid Value Count" );
836 return (float)entry->GetValue(0);
838 gdcmWarningMacro( "Wrong Location (0020,0050)");
841 return 0.; // Hopeless
845 * \brief gets the info from 0020,0037 : Image Orientation Patient
846 * or from 0020 0035 : Image Orientation (RET)
848 * (needed to organize DICOM files based on their x,y,z position)
850 * @param iop adress of the (6)float array to receive values.
851 * (defaulted as 1.,0.,0.,0.,1.,0. if nothing -or inconsistent stuff-
853 * @return true when one of the tag -with consistent values- is found
854 * false when nothing or inconsistent stuff - is found
856 bool File::GetImageOrientationPatient( float iop[6] )
858 std::string strImOriPat;
859 //iop is supposed to be float[6]
860 iop[0] = iop[4] = 1.;
861 iop[1] = iop[2] = iop[3] = iop[5] = 0.;
863 // 0020 0037 DS REL Image Orientation (Patient)
864 if ( (strImOriPat = GetEntryString(0x0020,0x0037)) != GDCM_UNFOUND )
866 if ( sscanf( strImOriPat.c_str(), "%f \\ %f \\%f \\%f \\%f \\%f ",
867 &iop[0], &iop[1], &iop[2], &iop[3], &iop[4], &iop[5]) != 6 )
869 gdcmWarningMacro( "Wrong Image Orientation Patient (0020,0037)."
870 << " Less than 6 values were found." );
876 // 0020 0035 DS REL Image Orientation (RET)
877 else if ( (strImOriPat = GetEntryString(0x0020,0x0035)) != GDCM_UNFOUND )
879 if ( sscanf( strImOriPat.c_str(), "%f \\ %f \\%f \\%f \\%f \\%f ",
880 &iop[0], &iop[1], &iop[2], &iop[3], &iop[4], &iop[5]) != 6 )
882 gdcmWarningMacro( "wrong Image Orientation Patient (0020,0035). "
883 << "Less than 6 values were found." );
892 * \brief Retrieve the number of Bits Stored (actually used)
893 * (as opposed to number of Bits Allocated)
894 * @return The encountered number of Bits Stored, 0 by default.
895 * 0 means the file is NOT USABLE. The caller has to check it !
897 int File::GetBitsStored()
899 DataEntry *entry = GetDataEntry(0x0028,0x0101);
902 gdcmWarningMacro("BitsStored (0028,0101) is supposed to be mandatory");
905 return (int)entry->GetValue(0);
909 * \brief Retrieve the number of Bits Allocated
910 * (8, 12 -compacted ACR-NEMA files-, 16, 24 -old RGB ACR-NEMA files-,)
911 * @return The encountered Number of Bits Allocated, 0 by default.
912 * 0 means the file is NOT USABLE. The caller has to check it !
914 int File::GetBitsAllocated()
916 DataEntry *entry = GetDataEntry(0x0028,0x0100);
919 gdcmWarningMacro("BitsAllocated (0028,0100) is supposed to be mandatory");
922 return (int)entry->GetValue(0);
926 * \brief Retrieve the high bit position.
927 * \warning The method defaults to 0 when information is missing.
928 * The responsability of checking this value is left to the caller.
929 * @return The high bit position when present. 0 when missing.
931 int File::GetHighBitPosition()
933 DataEntry *entry = GetDataEntry(0x0028,0x0102);
936 gdcmWarningMacro("HighBitPosition (0028,0102) is supposed to be mandatory");
939 return (int)entry->GetValue(0);
943 * \brief Retrieve the number of Samples Per Pixel
944 * (1 : gray level, 3 : RGB/YBR -1 or 3 Planes-)
945 * @return The encountered number of Samples Per Pixel, 1 by default.
946 * (we assume Gray level Pixels)
948 int File::GetSamplesPerPixel()
950 DataEntry *entry = GetDataEntry(0x0028,0x0002);
953 gdcmWarningMacro("SamplesPerPixel (0028,0002) is supposed to be mandatory");
954 return 1; // Well, it's supposed to be mandatory ...
955 // but sometimes it's missing : *we* assume Gray pixels
957 return (int)entry->GetValue(0);
961 * \brief Retrieve the Planar Configuration for RGB images
962 * (0 : RGB Pixels , 1 : R Plane + G Plane + B Plane)
963 * @return The encountered Planar Configuration, 0 by default.
965 int File::GetPlanarConfiguration()
967 DataEntry *entry = GetDataEntry(0x0028,0x0006);
972 return (int)entry->GetValue(0);
976 * \brief Return the size (in bytes) of a single pixel of data.
977 * @return The size in bytes of a single pixel of data; 0 by default
978 * 0 means the file is NOT USABLE; the caller will have to check
980 int File::GetPixelSize()
982 // 0028 0100 US IMG Bits Allocated
983 // (in order no to be messed up by old ACR-NEMA RGB images)
984 assert( !(GetEntryString(0x0028,0x0100) == "24") );
986 std::string pixelType = GetPixelType();
987 if ( pixelType == "8U" || pixelType == "8S" )
991 if ( pixelType == "16U" || pixelType == "16S")
995 if ( pixelType == "32U" || pixelType == "32S")
999 if ( pixelType == "FD" )
1003 gdcmWarningMacro( "Unknown pixel type: " << pixelType);
1008 * \brief Build the Pixel Type of the image.
1009 * Possible values are:
1010 * - 8U unsigned 8 bit,
1011 * - 8S signed 8 bit,
1012 * - 16U unsigned 16 bit,
1013 * - 16S signed 16 bit,
1014 * - 32U unsigned 32 bit,
1015 * - 32S signed 32 bit,
1016 * - FD floating double 64 bits (Not kosher DICOM, but so usefull!)
1017 * \warning 12 bit images appear as 16 bit.
1018 * 24 bit images appear as 8 bit + photochromatic interp ="RGB "
1019 * + Planar Configuration = 0
1020 * @return 0S if nothing found. NOT USABLE file. The caller has to check
1022 std::string File::GetPixelType()
1024 std::string bitsAlloc = GetEntryString(0x0028, 0x0100); // Bits Allocated
1025 if ( bitsAlloc == GDCM_UNFOUND )
1027 gdcmWarningMacro( "Bits Allocated (0028,0100) supposed to be mandatory");
1028 bitsAlloc = "16"; // default and arbitrary value, not to polute the output
1031 if ( bitsAlloc == "64" )
1035 else if ( bitsAlloc == "12" )
1037 // It will be unpacked
1040 else if ( bitsAlloc == "24" )
1042 // (in order no to be messed up by old RGB images)
1047 if( IsSignedPixelData() )
1055 return bitsAlloc + sign;
1059 * \brief Check whether the pixels are signed (1) or UNsigned (0) data.
1060 * \warning The method defaults to false (UNsigned) when tag 0028|0103
1062 * The responsability of checking this value is left to the caller
1063 * (NO transformation is performed on the pixels to make then >0)
1064 * @return True when signed, false when UNsigned
1066 bool File::IsSignedPixelData()
1068 DataEntry *entry = GetDataEntry(0x0028, 0x0103);//"Pixel Representation"
1071 gdcmWarningMacro( "Pixel Representation (0028,0103) supposed to be "
1075 return entry->GetValue(0) != 0;
1079 * \brief Check whether this a monochrome picture (gray levels) or not,
1080 * using "Photometric Interpretation" tag (0x0028,0x0004).
1081 * @return true when "MONOCHROME1" or "MONOCHROME2". False otherwise.
1083 bool File::IsMonochrome()
1085 const std::string &PhotometricInterp = GetEntryString( 0x0028, 0x0004 );
1086 if ( Util::DicomStringEqual(PhotometricInterp, "MONOCHROME1")
1087 || Util::DicomStringEqual(PhotometricInterp, "MONOCHROME2") )
1091 if ( PhotometricInterp == GDCM_UNFOUND )
1093 gdcmWarningMacro( "Photometric Interpretation (0028,0004) supposed to be "
1100 * \brief Check whether this a MONOCHROME1 picture (high values = dark)
1101 * or not using "Photometric Interpretation" tag (0x0028,0x0004).
1102 * @return true when "MONOCHROME1" . False otherwise.
1104 bool File::IsMonochrome1()
1106 const std::string &PhotometricInterp = GetEntryString( 0x0028, 0x0004 );
1107 if ( Util::DicomStringEqual(PhotometricInterp, "MONOCHROME1") )
1111 if ( PhotometricInterp == GDCM_UNFOUND )
1113 gdcmWarningMacro( "Photometric Interpretation (0028,0004) : supposed to"
1114 << " be mandatory! ");
1120 * \brief Check whether this a "PALETTE COLOR" picture or not by accessing
1121 * the "Photometric Interpretation" tag ( 0x0028, 0x0004 ).
1122 * @return true when "PALETTE COLOR". False otherwise.
1124 bool File::IsPaletteColor()
1126 std::string PhotometricInterp = GetEntryString( 0x0028, 0x0004 );
1127 if ( PhotometricInterp == "PALETTE COLOR " )
1131 if ( PhotometricInterp == GDCM_UNFOUND )
1133 gdcmDebugMacro( "Not found : Palette color (0028,0004)");
1139 * \brief Check whether this a "YBR_FULL" color picture or not by accessing
1140 * the "Photometric Interpretation" tag ( 0x0028, 0x0004 ).
1141 * @return true when "YBR_FULL". False otherwise.
1143 bool File::IsYBRFull()
1145 std::string PhotometricInterp = GetEntryString( 0x0028, 0x0004 );
1146 if ( PhotometricInterp == "YBR_FULL" )
1150 if ( PhotometricInterp == GDCM_UNFOUND )
1152 gdcmDebugMacro( "Not found : YBR Full (0028,0004)");
1158 * \brief tells us if LUT are used
1159 * \warning Right now, 'Segmented xxx Palette Color Lookup Table Data'
1160 * are NOT considered as LUT, since nobody knows
1161 * how to deal with them
1162 * Please warn me if you know sbdy that *does* know ... jprx
1163 * @return true if LUT Descriptors and LUT Tables were found
1167 // Check the presence of the LUT Descriptors, and LUT Tables
1169 if ( !GetDocEntry(0x0028,0x1101) )
1173 // LutDescriptorGreen
1174 if ( !GetDocEntry(0x0028,0x1102) )
1178 // LutDescriptorBlue
1179 if ( !GetDocEntry(0x0028,0x1103) )
1183 // Red Palette Color Lookup Table Data
1184 if ( !GetDocEntry(0x0028,0x1201) )
1188 // Green Palette Color Lookup Table Data
1189 if ( !GetDocEntry(0x0028,0x1202) )
1193 // Blue Palette Color Lookup Table Data
1194 if ( !GetDocEntry(0x0028,0x1203) )
1199 // FIXME : (0x0028,0x3006) : LUT Data (CTX dependent)
1200 // NOT taken into account, but we don't know how to use it ...
1205 * \brief gets the info from 0028,1101 : Lookup Table Desc-Red
1207 * @return Lookup Table number of Bits , 0 by default
1208 * when (0028,0004),Photometric Interpretation = [PALETTE COLOR ]
1209 * @ return bit number of each LUT item
1211 int File::GetLUTNbits()
1213 std::vector<std::string> tokens;
1216 //Just hope Lookup Table Desc-Red = Lookup Table Desc-Red
1217 // = Lookup Table Desc-Blue
1218 // Consistency already checked in GetLUTLength
1219 std::string lutDescription = GetEntryString(0x0028,0x1101);
1220 if ( lutDescription == GDCM_UNFOUND )
1225 tokens.clear(); // clean any previous value
1226 Util::Tokenize ( lutDescription, tokens, "\\" );
1227 //LutLength=atoi(tokens[0].c_str());
1228 //LutDepth=atoi(tokens[1].c_str());
1230 lutNbits = atoi( tokens[2].c_str() );
1237 *\brief gets the info from 0028,1052 : Rescale Intercept
1238 * @return Rescale Intercept. defaulted to 0.0 is not found or empty
1240 float File::GetRescaleIntercept()
1242 // 0028 1052 DS IMG Rescale Intercept
1243 DataEntry *entry = GetDataEntry(0x0028, 0x1052);
1246 gdcmWarningMacro( "Missing Rescale Intercept (0028,1052)");
1249 return (float)entry->GetValue(0);
1254 *\brief gets the info from 0028,1053 : Rescale Slope
1255 * @return Rescale Slope. defaulted to 1.0 is not found or empty
1257 float File::GetRescaleSlope()
1259 // 0028 1053 DS IMG Rescale Slope
1260 DataEntry *entry = GetDataEntry(0x0028, 0x1053);
1263 gdcmDebugMacro( "Missing Rescale Slope (0028,1053)");
1266 return (float)entry->GetValue(0);
1270 * \brief This function is intended to user who doesn't want
1271 * to have to manage a LUT and expects to get an RBG Pixel image
1272 * (or a monochrome one, if no LUT found ...)
1273 * \warning to be used with GetImagePixels()
1274 * @return 1 if Gray level, 3 if Color (RGB, YBR, *or PALETTE COLOR*)
1276 int File::GetNumberOfScalarComponents()
1278 if ( GetSamplesPerPixel() == 3 )
1283 // 0028 0100 US IMG Bits Allocated
1284 // (in order no to be messed up by old RGB images)
1285 if ( GetEntryString(0x0028,0x0100) == "24" )
1290 std::string strPhotometricInterpretation = GetEntryString(0x0028,0x0004);
1292 if ( ( strPhotometricInterpretation == "PALETTE COLOR ") )
1294 if ( HasLUT() )// PALETTE COLOR is NOT enough
1304 // beware of trailing space at end of string
1305 // DICOM tags are never of odd length
1306 if ( strPhotometricInterpretation == GDCM_UNFOUND ||
1307 Util::DicomStringEqual(strPhotometricInterpretation, "MONOCHROME1") ||
1308 Util::DicomStringEqual(strPhotometricInterpretation, "MONOCHROME2") )
1314 // we assume that *all* kinds of YBR are dealt with
1320 * \brief This function is intended to user that DOESN'T want
1321 * to get RGB pixels image when it's stored as a PALETTE COLOR image
1322 * - the (vtk) user is supposed to know how deal with LUTs -
1323 * \warning to be used with GetImagePixelsRaw()
1324 * @return 1 if Gray level, 3 if Color (RGB or YBR - NOT 'PALETTE COLOR' -)
1326 int File::GetNumberOfScalarComponentsRaw()
1328 // 0028 0100 US IMG Bits Allocated
1329 // (in order no to be messed up by old RGB images)
1330 if ( File::GetEntryString(0x0028,0x0100) == "24" )
1335 // we assume that *all* kinds of YBR are dealt with
1336 return GetSamplesPerPixel();
1340 * \brief Recover the offset (from the beginning of the file)
1341 * of *image* pixels (not *icone image* pixels, if any !)
1342 * @return Pixel Offset
1344 size_t File::GetPixelOffset()
1346 DocEntry *pxlElement = GetDocEntry(GrPixel, NumPixel);
1349 return pxlElement->GetOffset();
1353 gdcmWarningMacro( "Big trouble : Pixel Element ("
1354 << std::hex << GrPixel<<","<< NumPixel<< ") NOT found" );
1360 * \brief Recover the pixel area length (in Bytes)
1361 * @return Pixel Element Length, as stored in the header
1362 * (NOT the memory space necessary to hold the Pixels
1363 * -in case of embeded compressed image-)
1364 * 0 : NOT USABLE file. The caller has to check.
1366 size_t File::GetPixelAreaLength()
1368 DocEntry *pxlElement = GetDocEntry(GrPixel, NumPixel);
1371 return pxlElement->GetLength();
1375 gdcmWarningMacro( "Big trouble : Pixel Element ("
1376 << std::hex << GrPixel<<","<< NumPixel<< ") NOT found" );
1382 * \brief Adds the characteristics of a new element we want to anonymize
1383 * @param group Group number of the target tag.
1384 * @param elem Element number of the target tag.
1385 * @param value new value (string) to substitute with
1387 void File::AddAnonymizeElement (uint16_t group, uint16_t elem,
1388 std::string const &value)
1394 UserAnonymizeList.push_back(el);
1398 * \brief Overwrites in the file the values of the DicomElements
1401 void File::AnonymizeNoLoad()
1403 std::fstream *fp = new std::fstream(Filename.c_str(),
1404 std::ios::in | std::ios::out | std::ios::binary);
1408 uint32_t valLgth = 0;
1409 std::string *spaces;
1410 for (ListElements::iterator it = UserAnonymizeList.begin();
1411 it != UserAnonymizeList.end();
1415 //std::cout << "File::AnonymizeNoLoad -------" << std::hex <<(*it).Group <<"|"<<
1417 // << "[" << (*it).Value << "] "<< std::dec << std::endl;
1418 d = GetDocEntry( (*it).Group, (*it).Elem);
1423 if ( dynamic_cast<SeqEntry *>(d) )
1425 gdcmWarningMacro( "You cannot 'Anonymize' a SeqEntry ");
1429 valLgth = (*it).Value.size();
1433 offset = d->GetOffset();
1434 lgth = d->GetLength();
1436 //std::cout << "lgth " << lgth << " valLgth " << valLgth << std::endl;
1439 spaces = new std::string( lgth-valLgth, ' ');
1440 (*it).Value = (*it).Value + *spaces;
1441 //std::cout << "[" << (*it).Value << "] " << lgth << std::endl;
1444 fp->seekp( offset, std::ios::beg );
1445 fp->write( (*it).Value.c_str(), lgth );
1453 * \brief anonymize a File (remove Patient's personal info passed with
1454 * AddAnonymizeElement()
1455 * \note You cannot Anonymize a DataEntry (to be fixed)
1457 bool File::AnonymizeFile()
1459 // If Anonymisation list is empty, let's perform some basic anonymization
1460 if ( UserAnonymizeList.begin() == UserAnonymizeList.end() )
1462 // If exist, replace by spaces
1463 SetEntryString(" ",0x0010, 0x2154); // Telephone
1464 SetEntryString(" ",0x0010, 0x1040); // Adress
1465 SetEntryString(" ",0x0010, 0x0020); // Patient ID
1467 DocEntry *patientNameHE = GetDocEntry (0x0010, 0x0010);
1469 if ( patientNameHE ) // we replace it by Study Instance UID (why not ?)
1471 std::string studyInstanceUID = GetEntryString (0x0020, 0x000d);
1472 if ( studyInstanceUID != GDCM_UNFOUND )
1474 SetEntryString(studyInstanceUID, 0x0010, 0x0010);
1478 SetEntryString("anonymized", 0x0010, 0x0010);
1485 for (ListElements::iterator it = UserAnonymizeList.begin();
1486 it != UserAnonymizeList.end();
1489 d = GetDocEntry( (*it).Group, (*it).Elem);
1494 if ( dynamic_cast<SeqEntry *>(d) )
1496 gdcmWarningMacro( "You cannot 'Anonymize' a SeqEntry ");
1500 if ( dynamic_cast<DataEntry *>(d) )
1502 gdcmWarningMacro( "To 'Anonymize' a DataEntry, better use AnonymizeNoLoad (FIXME) ");
1506 SetEntryString ((*it).Value, (*it).Group, (*it).Elem);
1510 // In order to make definitively impossible any further identification
1511 // remove or replace all the stuff that contains a Date
1513 //0008 0012 DA ID Instance Creation Date
1514 //0008 0020 DA ID Study Date
1515 //0008 0021 DA ID Series Date
1516 //0008 0022 DA ID Acquisition Date
1517 //0008 0023 DA ID Content Date
1518 //0008 0024 DA ID Overlay Date
1519 //0008 0025 DA ID Curve Date
1520 //0008 002a DT ID Acquisition Datetime
1521 //0018 9074 DT ACQ Frame Acquisition Datetime
1522 //0018 9151 DT ACQ Frame Reference Datetime
1523 //0018 a002 DT ACQ Contribution Date Time
1524 //0020 3403 SH REL Modified Image Date (RET)
1525 //0032 0032 DA SDY Study Verified Date
1526 //0032 0034 DA SDY Study Read Date
1527 //0032 1000 DA SDY Scheduled Study Start Date
1528 //0032 1010 DA SDY Scheduled Study Stop Date
1529 //0032 1040 DA SDY Study Arrival Date
1530 //0032 1050 DA SDY Study Completion Date
1531 //0038 001a DA VIS Scheduled Admission Date
1532 //0038 001c DA VIS Scheduled Discharge Date
1533 //0038 0020 DA VIS Admitting Date
1534 //0038 0030 DA VIS Discharge Date
1535 //0040 0002 DA PRC Scheduled Procedure Step Start Date
1536 //0040 0004 DA PRC Scheduled Procedure Step End Date
1537 //0040 0244 DA PRC Performed Procedure Step Start Date
1538 //0040 0250 DA PRC Performed Procedure Step End Date
1539 //0040 2004 DA PRC Issue Date of Imaging Service Request
1540 //0040 4005 DT PRC Scheduled Procedure Step Start Date and Time
1541 //0040 4011 DT PRC Expected Completion Date and Time
1542 //0040 a030 DT PRC Verification Date Time
1543 //0040 a032 DT PRC Observation Date Time
1544 //0040 a120 DT PRC DateTime
1545 //0040 a121 DA PRC Date
1546 //0040 a13a DT PRC Referenced Datetime
1547 //0070 0082 DA ??? Presentation Creation Date
1548 //0100 0420 DT ??? SOP Autorization Date and Time
1549 //0400 0105 DT ??? Digital Signature DateTime
1550 //2100 0040 DA PJ Creation Date
1551 //3006 0008 DA SSET Structure Set Date
1552 //3008 0024 DA ??? Treatment Control Point Date
1553 //3008 0054 DA ??? First Treatment Date
1554 //3008 0056 DA ??? Most Recent Treatment Date
1555 //3008 0162 DA ??? Safe Position Exit Date
1556 //3008 0166 DA ??? Safe Position Return Date
1557 //3008 0250 DA ??? Treatment Date
1558 //300a 0006 DA RT RT Plan Date
1559 //300a 022c DA RT Air Kerma Rate Reference Date
1560 //300e 0004 DA RT Review Date
1566 * \brief Performs some consistency checking on various 'File related'
1567 * (as opposed to 'DicomDir related') entries
1568 * then writes in a file all the (Dicom Elements) included the Pixels
1569 * @param fileName file name to write to
1570 * @param writetype type of the file to be written
1571 * (ACR, ExplicitVR, ImplicitVR)
1573 bool File::Write(std::string fileName, FileType writetype)
1575 std::ofstream *fp = new std::ofstream(fileName.c_str(),
1576 std::ios::out | std::ios::binary);
1579 gdcmWarningMacro("Failed to open (write) File: " << fileName.c_str());
1583 // Entry : 0002|0000 = group length -> recalculated
1584 DataEntry *e0000 = GetDataEntry(0x0002,0x0000);
1587 std::ostringstream sLen;
1588 sLen << ComputeGroup0002Length( );
1589 e0000->SetString(sLen.str());
1592 /// \todo FIXME : Derma?.dcm does not have it...let's remove it ?!? JPRx
1593 if( writetype != JPEG )
1595 int i_lgPix = GetEntryLength(GrPixel, NumPixel);
1598 // no (GrPixel, NumPixel) element
1599 std::string s_lgPix = Util::Format("%d", i_lgPix+12);
1600 s_lgPix = Util::DicomString( s_lgPix.c_str() );
1601 InsertEntryString(s_lgPix,GrPixel, 0x0000, "UL");
1604 Document::WriteContent(fp, writetype);
1612 //-----------------------------------------------------------------------------
1616 //-----------------------------------------------------------------------------
1619 * \brief Parse pixel data from disk of [multi-]fragment RLE encoding.
1620 * Compute the RLE extra information and store it in \ref RLEInfo
1621 * for later pixel retrieval usage.
1623 void File::ComputeRLEInfo()
1625 std::string ts = GetTransferSyntax();
1626 if ( !Global::GetTS()->IsRLELossless(ts) )
1631 // Encoded pixel data: for the time being we are only concerned with
1632 // Jpeg or RLE Pixel data encodings.
1633 // As stated in PS 3.5-2003, section 8.2 p44:
1634 // "If sent in Encapsulated Format (i.e. other than the Native Format) the
1635 // value representation OB is used".
1636 // Hence we expect an OB value representation. Concerning OB VR,
1637 // the section PS 3.5-2003, section A.4.c p 58-59, states:
1638 // "For the Value Representations OB and OW, the encoding shall meet the
1639 // following specifications depending on the Data element tag:"
1641 // - the first item in the sequence of items before the encoded pixel
1642 // data stream shall be basic offset table item. The basic offset table
1643 // item value, however, is not required to be present"
1644 ReadEncapsulatedBasicOffsetTable();
1646 // Encapsulated RLE Compressed Images (see PS 3.5-2003, Annex G)
1647 // Loop on the individual frame[s] and store the information
1648 // on the RLE fragments in a RLEFramesInfo.
1649 // Note: - when only a single frame is present, this is a
1651 // - when more than one frame are present, then we are in
1652 // the case of a multi-frame image.
1656 while ( (frameLength = ReadTagLength(0xfffe, 0xe000)) != 0 )
1658 // Since we have read the basic offset table, let's check the value were correct
1659 // or else produce a warning:
1660 if ( BasicOffsetTableItemValue )
1662 // If a BasicOffsetTableItemValue was read
1663 uint32_t individualLength = BasicOffsetTableItemValue[i];
1664 assert( individualLength == sum ); // REMOVE that if this is a problem
1665 if( individualLength != sum )
1667 gdcmWarningMacro( "BasicOffsetTableItemValue differs from the fragment lenght" );
1669 sum += frameLength + 8;
1672 // Parse the RLE Header and store the corresponding RLE Segment
1673 // Offset Table information on fragments of this current Frame.
1674 // Note that the fragment pixels themselves are not loaded
1675 // (but just skipped).
1676 long frameOffset = Fp->tellg(); // once per fragment
1678 uint32_t nbRleSegments = ReadInt32();
1679 if ( nbRleSegments > 16 )
1681 // There should be at most 15 segments (refer to RLEFrame class)
1682 gdcmWarningMacro( "Too many segments.");
1685 uint32_t rleSegmentOffsetTable[16];
1686 for( int k = 1; k <= 15; k++ )
1688 rleSegmentOffsetTable[k] = ReadInt32();
1691 // Deduce from both RLE Header and frameLength
1692 // the fragment length, and again store this info
1693 // in a RLEFramesInfo.
1694 long rleSegmentLength[15];
1695 // skipping (not reading) RLE Segments
1696 if ( nbRleSegments > 1)
1698 for(unsigned int k = 1; k <= nbRleSegments-1; k++)
1700 rleSegmentLength[k] = rleSegmentOffsetTable[k+1]
1701 - rleSegmentOffsetTable[k];
1702 SkipBytes(rleSegmentLength[k]);
1706 rleSegmentLength[nbRleSegments] = frameLength
1707 - rleSegmentOffsetTable[nbRleSegments];
1708 SkipBytes(rleSegmentLength[nbRleSegments]);
1710 // Store the collected info
1711 RLEFrame *newFrame = new RLEFrame;
1712 newFrame->SetNumberOfFragments(nbRleSegments);
1713 for( unsigned int uk = 1; uk <= nbRleSegments; uk++ )
1715 newFrame->SetOffset(uk,frameOffset + rleSegmentOffsetTable[uk]);
1716 newFrame->SetLength(uk,rleSegmentLength[uk]);
1718 RLEInfo->AddFrame(newFrame);
1721 // Make sure that we encounter a 'Sequence Delimiter Item'
1722 // at the end of the item :
1723 if ( !ReadTag(0xfffe, 0xe0dd) ) // once per RLE File
1725 gdcmWarningMacro( "No sequence delimiter item at end of RLE item sequence");
1730 * \brief Parse pixel data from disk of [multi-]fragment Jpeg encoding.
1731 * Compute the jpeg extra information (fragment[s] offset[s] and
1732 * length) and store it[them] in \ref JPEGInfo for later pixel
1735 void File::ComputeJPEGFragmentInfo()
1737 // If you need to, look for comments of ComputeRLEInfo().
1738 std::string ts = GetTransferSyntax();
1739 if ( ! Global::GetTS()->IsJPEG(ts) )
1744 ReadEncapsulatedBasicOffsetTable();
1746 // Loop on the fragments[s] and store the parsed information in a
1748 long fragmentLength;
1751 while ( (fragmentLength = ReadTagLength(0xfffe, 0xe000)) != 0 )
1753 // Since we have read the basic offset table, let's check the value were correct
1754 // or else produce a warning:
1755 // A.4 Transfer syntaxes for encapsulation of encoded pixel data:
1756 // When the Item Value is present, the Basic Offset Table Item Value shall contain
1757 // concatenated 32-bit unsigned integer values that are byte offsets to the first
1758 // byte of the Item Tag of the first fragment for each frame in the Sequence of
1759 // Items. These offsets are measured from the first byte of the first Item Tag
1760 // following the Basic Offset Table item (See Table A.4-2).
1762 if ( BasicOffsetTableItemValue )
1764 // If a BasicOffsetTableItemValue was read
1765 uint32_t individualLength = BasicOffsetTableItemValue[i];
1766 //assert( individualLength == sum ); // Seems like 00191113.dcm is off by one ??
1767 if( individualLength != sum )
1769 gdcmWarningMacro( "BasicOffsetTableItemValue differs from the fragment lenght:" <<
1770 individualLength << " != " << sum );
1772 sum += fragmentLength + 8;
1776 long fragmentOffset = Fp->tellg(); // Once per fragment
1777 // Store the collected info
1778 JPEGFragment *newFragment = new JPEGFragment;
1779 newFragment->SetOffset(fragmentOffset);
1780 newFragment->SetLength(fragmentLength);
1781 JPEGInfo->AddFragment(newFragment);
1783 SkipBytes(fragmentLength);
1786 // Make sure that we encounter a 'Sequence Delimiter Item'
1787 // at the end of the item :
1788 if ( !ReadTag(0xfffe, 0xe0dd) )
1790 gdcmWarningMacro( "No sequence delimiter item at end of JPEG item sequence");
1795 * \brief Assuming the internal file pointer \ref Document::Fp
1796 * is placed at the beginning of a tag, check whether this
1797 * tag is (TestGroup, TestElem).
1798 * \warning On success the internal file pointer \ref Document::Fp
1799 * is modified to point after the tag.
1800 * On failure (i.e. when the tag wasn't the expected tag
1801 * (TestGroup, TestElem) the internal file pointer
1802 * \ref Document::Fp is restored to it's original position.
1803 * @param testGroup The expected group of the tag.
1804 * @param testElem The expected Element of the tag.
1805 * @return True on success, false otherwise.
1807 bool File::ReadTag(uint16_t testGroup, uint16_t testElem)
1809 long positionOnEntry = Fp->tellg(); // Only when reading fragments
1810 //long currentPosition = positionOnEntry; // On debugging purposes
1812 // Read the Item Tag group and element, and make
1813 // sure they are what we expected:
1814 uint16_t itemTagGroup;
1815 uint16_t itemTagElem;
1818 itemTagGroup = ReadInt16();
1819 itemTagElem = ReadInt16();
1821 catch ( FormatError )
1823 gdcmErrorMacro( "Can not read tag for "
1824 << " We should have found tag ("
1825 << DictEntry::TranslateToKey(testGroup,testElem) << ")"
1830 if ( itemTagGroup != testGroup || itemTagElem != testElem )
1832 // in order not to pollute output we don't warn on 'delimitors'
1833 if (itemTagGroup != 0xfffe || testGroup != 0xfffe )
1834 gdcmWarningMacro( "Wrong Item Tag found:"
1835 << " We should have found tag ("
1836 << DictEntry::TranslateToKey(testGroup,testElem) << ")" << std::endl
1837 << " but instead we encountered tag ("
1838 << DictEntry::TranslateToKey(itemTagGroup,itemTagElem) << ")"
1839 << " at address: " << " 0x(" << std::hex
1840 << (unsigned int)positionOnEntry << std::dec << ")"
1842 Fp->seekg(positionOnEntry, std::ios::beg);
1850 * \brief Assuming the internal file pointer \ref Document::Fp
1851 * is placed at the beginning of a tag (TestGroup, TestElement),
1852 * read the length associated to the Tag.
1853 * \warning On success the internal file pointer \ref Document::Fp
1854 * is modified to point after the tag and it's length.
1855 * On failure (i.e. when the tag wasn't the expected tag
1856 * (TestGroup, TestElement) the internal file pointer
1857 * \ref Document::Fp is restored to it's original position.
1858 * @param testGroup The expected Group of the tag.
1859 * @param testElem The expected Element of the tag.
1860 * @return On success returns the length associated to the tag. On failure
1863 uint32_t File::ReadTagLength(uint16_t testGroup, uint16_t testElem)
1866 if ( !ReadTag(testGroup, testElem) )
1868 // Avoid polutting output
1869 if ( testGroup != 0xfffe )
1870 gdcmErrorMacro( "ReadTag did not succeed for ("
1871 << DictEntry::TranslateToKey(testGroup,testElem)
1876 //// Then read the associated Item Length
1878 // long currentPosition = Fp->tellg(); // save time // JPRx
1879 uint32_t itemLength = ReadInt32();
1880 gdcmDebugMacro( "Basic Item Length is: " << itemLength
1881 // << " at address: " << std::hex << (unsigned int)currentPosition
1887 * \brief When parsing the Pixel Data of an encapsulated file, read
1888 * the basic offset table (when present, and BTW dump it).
1890 void File::ReadEncapsulatedBasicOffsetTable()
1892 //// Read the Basic Offset Table Item Tag length...
1893 uint32_t itemLength = ReadTagLength(0xfffe, 0xe000);
1895 // When present, read the basic offset table itself.
1896 // Notes: - since the presence of this basic offset table is optional
1897 // we can't rely on it for the implementation, and we will simply
1898 // trash it's content (when present).
1899 // - still, when present, we could add some further checks on the
1900 // lengths, but we won't bother with such fuses for the time being.
1901 if ( itemLength != 0 )
1903 char *charBasicOffsetTableItemValue = new char[itemLength];
1904 Fp->read(charBasicOffsetTableItemValue, itemLength);
1905 unsigned int nbEntries = itemLength/4;
1906 assert( nbEntries*4 == itemLength); // Make sure this is a multiple
1907 BasicOffsetTableItemValue = new uint32_t[nbEntries];
1909 for (unsigned int i=0; i < nbEntries; i++ )
1911 BasicOffsetTableItemValue[i] = *((uint32_t*)(&charBasicOffsetTableItemValue[4*i]));
1912 #if defined(GDCM_WORDS_BIGENDIAN) || defined(GDCM_FORCE_BIGENDIAN_EMULATION)
1913 uint32_t val = BasicOffsetTableItemValue[i];
1914 BasicOffsetTableItemValue[i]
1915 = ( (val<<24) | ((val<<8) & 0x00ff0000) |
1916 ( (val>>8) & 0x0000ff00) | (val>>24) );
1918 gdcmDebugMacro( "Read one length for: " <<
1919 std::hex << BasicOffsetTableItemValue[i] );
1922 delete[] charBasicOffsetTableItemValue;
1926 // These are the deprecated method that one day should be removed (after the next release)
1928 //#ifndef GDCM_LEGACY_REMOVE
1930 * \ brief Loader. (DEPRECATED : temporaryly kept not to break the API)
1931 * @ param fileName file to be open for parsing
1932 * @ return false if file cannot be open or no swap info was found,
1933 * or no tag was found.
1934 * @deprecated Use the Load() [ + SetLoadMode() ] + SetFileName() functions instead
1937 bool File::Load( std::string const &fileName )
1939 GDCM_LEGACY_REPLACED_BODY(File::Load(std::string), "1.2",
1941 SetFileName( fileName );
1942 if ( ! this->Document::Load( ) )
1945 return DoTheLoadingJob( );
1949 //-----------------------------------------------------------------------------
1952 //-----------------------------------------------------------------------------
1953 } // end namespace gdcm