1 // $Header: /cvs/public/gdcm/src/Attic/gdcmHeader.cxx,v 1.103 2003/10/23 12:08:32 jpr Exp $
3 #include "gdcmHeader.h"
11 #include <netinet/in.h>
13 #include <cctype> // for isalpha
18 // Refer to gdcmHeader::CheckSwap()
19 #define HEADER_LENGTH_TO_READ 256
20 // Refer to gdcmHeader::SetMaxSizeLoadElementValue()
21 //#define _MaxSizeLoadElementValue_ 1024
22 #define _MaxSizeLoadElementValue_ 4096
27 void gdcmHeader::Initialise(void) {
28 dicom_vr = gdcmGlobal::GetVR();
29 dicom_ts = gdcmGlobal::GetTS();
30 Dicts = gdcmGlobal::GetDicts();
31 RefPubDict = Dicts->GetDefaultPubDict();
32 RefShaDict = (gdcmDict*)0;
39 * @param exception_on_error
41 gdcmHeader::gdcmHeader(const char *InFilename, bool exception_on_error) {
42 SetMaxSizeLoadElementValue(_MaxSizeLoadElementValue_);
43 filename = InFilename;
45 if ( !OpenFile(exception_on_error))
55 * @param exception_on_error
57 gdcmHeader::gdcmHeader(bool exception_on_error) {
58 SetMaxSizeLoadElementValue(_MaxSizeLoadElementValue_);
65 * @param exception_on_error
68 bool gdcmHeader::OpenFile(bool exception_on_error)
69 throw(gdcmFileError) {
70 fp=fopen(filename.c_str(),"rb");
71 if(exception_on_error) {
73 throw gdcmFileError("gdcmHeader::gdcmHeader(const char *, bool)");
78 fread(&zero, (size_t)2, (size_t)1, fp);
80 //ACR -- or DICOM with no Preamble
81 if( zero == 0x0008 || zero == 0x0800 || zero == 0x0002 || zero == 0x0200)
84 fseek(fp, 126L, SEEK_CUR);
86 fread(dicm, (size_t)4, (size_t)1, fp);
87 if( memcmp(dicm, "DICM", 4) == 0 )
90 dbg.Verbose(0, "gdcmHeader::gdcmHeader not DICOM/ACR", filename.c_str());
93 dbg.Verbose(0, "gdcmHeader::gdcmHeader cannot open file", filename.c_str());
101 * @return TRUE if the close was successfull
103 bool gdcmHeader::CloseFile(void) {
104 int closed = fclose(fp);
112 * \ingroup gdcmHeader
113 * \brief Canonical destructor.
115 gdcmHeader::~gdcmHeader (void) {
116 dicom_vr = (gdcmVR*)0;
117 Dicts = (gdcmDictSet*)0;
118 RefPubDict = (gdcmDict*)0;
119 RefShaDict = (gdcmDict*)0;
125 // ---> Warning : This fourth field is NOT part
126 // of the 'official' Dicom Dictionnary
127 // and should NOT be used.
128 // (Not defined for all the groups
129 // may be removed in a future release)
132 // META Meta Information
144 // NMI Nuclear Medicine
146 // BFS Basic Film Session
147 // BFB Basic Film Box
148 // BIB Basic Image Box
164 * \ingroup gdcmHeader
165 * \brief Discover what the swap code is (among little endian, big endian,
166 * bad little endian, bad big endian).
169 void gdcmHeader::CheckSwap()
171 // The only guaranted way of finding the swap code is to find a
172 // group tag since we know it's length has to be of four bytes i.e.
173 // 0x00000004. Finding the swap code in then straigthforward. Trouble
174 // occurs when we can't find such group...
176 guint32 x=4; // x : for ntohs
177 bool net2host; // true when HostByteOrder is the same as NetworkByteOrder
181 char deb[HEADER_LENGTH_TO_READ];
183 // First, compare HostByteOrder and NetworkByteOrder in order to
184 // determine if we shall need to swap bytes (i.e. the Endian type).
190 // The easiest case is the one of a DICOM header, since it possesses a
191 // file preamble where it suffice to look for the string "DICM".
192 lgrLue = fread(deb, 1, HEADER_LENGTH_TO_READ, fp);
195 if(memcmp(entCur, "DICM", (size_t)4) == 0) {
196 dbg.Verbose(1, "gdcmHeader::CheckSwap:", "looks like DICOM Version3");
197 // Next, determine the value representation (VR). Let's skip to the
198 // first element (0002, 0000) and check there if we find "UL"
199 // - or "OB" if the 1st one is (0002,0001) -,
200 // in which case we (almost) know it is explicit VR.
201 // WARNING: if it happens to be implicit VR then what we will read
202 // is the length of the group. If this ascii representation of this
203 // length happens to be "UL" then we shall believe it is explicit VR.
204 // FIXME: in order to fix the above warning, we could read the next
205 // element value (or a couple of elements values) in order to make
206 // sure we are not commiting a big mistake.
208 // * the 128 bytes of File Preamble (often padded with zeroes),
209 // * the 4 bytes of "DICM" string,
210 // * the 4 bytes of the first tag (0002, 0000),or (0002, 0001)
211 // i.e. a total of 136 bytes.
214 // Use gdcmHeader::dicom_vr to test all the possibilities
215 // instead of just checking for UL, OB and UI !?
216 if( (memcmp(entCur, "UL", (size_t)2) == 0) ||
217 (memcmp(entCur, "OB", (size_t)2) == 0) ||
218 (memcmp(entCur, "UI", (size_t)2) == 0) )
220 filetype = ExplicitVR;
221 dbg.Verbose(1, "gdcmHeader::CheckSwap:",
222 "explicit Value Representation");
224 filetype = ImplicitVR;
225 dbg.Verbose(1, "gdcmHeader::CheckSwap:",
226 "not an explicit Value Representation");
230 dbg.Verbose(1, "gdcmHeader::CheckSwap:",
231 "HostByteOrder != NetworkByteOrder");
234 dbg.Verbose(1, "gdcmHeader::CheckSwap:",
235 "HostByteOrder = NetworkByteOrder");
238 // Position the file position indicator at first tag (i.e.
239 // after the file preamble and the "DICM" string).
241 fseek (fp, 132L, SEEK_SET);
245 // Alas, this is not a DicomV3 file and whatever happens there is no file
246 // preamble. We can reset the file position indicator to where the data
247 // is (i.e. the beginning of the file).
248 dbg.Verbose(1, "gdcmHeader::CheckSwap:", "not a DICOM Version3 file");
251 // Our next best chance would be to be considering a 'clean' ACR/NEMA file.
252 // By clean we mean that the length of the first tag is written down.
253 // If this is the case and since the length of the first group HAS to be
254 // four (bytes), then determining the proper swap code is straightforward.
257 // We assume the array of char we are considering contains the binary
258 // representation of a 32 bits integer. Hence the following dirty
260 s = *((guint32 *)(entCur));
280 dbg.Verbose(0, "gdcmHeader::CheckSwap:",
281 "ACR/NEMA unfound swap info (time to raise bets)");
284 // We are out of luck. It is not a DicomV3 nor a 'clean' ACR/NEMA file.
285 // It is time for despaired wild guesses. So, let's assume this file
286 // happens to be 'dirty' ACR/NEMA, i.e. the length of the group is
287 // not present. Then the only info we have is the net2host one.
297 * \ingroup gdcmHeader
300 void gdcmHeader::SwitchSwapToBigEndian(void) {
301 dbg.Verbose(1, "gdcmHeader::SwitchSwapToBigEndian",
302 "Switching to BigEndian mode.");
320 * \ingroup gdcmHeader
321 * \brief Find the value representation of the current tag.
324 void gdcmHeader::FindVR( gdcmElValue *ElVal) {
325 if (filetype != ExplicitVR)
331 char msg[100]; // for sprintf. Sorry
333 long PositionOnEntry = ftell(fp);
334 // Warning: we believe this is explicit VR (Value Representation) because
335 // we used a heuristic that found "UL" in the first tag. Alas this
336 // doesn't guarantee that all the tags will be in explicit VR. In some
337 // cases (see e-film filtered files) one finds implicit VR tags mixed
338 // within an explicit VR file. Hence we make sure the present tag
339 // is in explicit VR and try to fix things if it happens not to be
341 bool RealExplicit = true;
343 lgrLue=fread (&VR, (size_t)2,(size_t)1, fp);
345 vr = std::string(VR);
347 // Assume we are reading a falsely explicit VR file i.e. we reached
348 // a tag where we expect reading a VR but are in fact we read the
349 // first to bytes of the length. Then we will interogate (through find)
350 // the dicom_vr dictionary with oddities like "\004\0" which crashes
351 // both GCC and VC++ implementations of the STL map. Hence when the
352 // expected VR read happens to be non-ascii characters we consider
353 // we hit falsely explicit VR tag.
355 if ( (!isalpha(VR[0])) && (!isalpha(VR[1])) )
356 RealExplicit = false;
358 // CLEANME searching the dicom_vr at each occurence is expensive.
359 // PostPone this test in an optional integrity check at the end
360 // of parsing or only in debug mode.
361 if ( RealExplicit && !dicom_vr->Count(vr) )
364 if ( RealExplicit ) {
365 if ( ElVal->IsVrUnknown() ) {
366 // When not a dictionary entry, we can safely overwrite the vr.
370 if ( ElVal->GetVR() == vr ) {
371 // The vr we just read and the dictionary agree. Nothing to do.
374 // The vr present in the file and the dictionary disagree. We assume
375 // the file writer knew best and use the vr of the file. Since it would
376 // be unwise to overwrite the vr of a dictionary (since it would
377 // compromise it's next user), we need to clone the actual DictEntry
378 // and change the vr for the read one.
379 gdcmDictEntry* NewTag = new gdcmDictEntry(ElVal->GetGroup(),
384 ElVal->SetDictEntry(NewTag);
388 // We thought this was explicit VR, but we end up with an
389 // implicit VR tag. Let's backtrack.
391 sprintf(msg,"Falsely explicit vr file (%04x,%04x)\n",
392 ElVal->GetGroup(),ElVal->GetElement());
393 dbg.Verbose(1, "gdcmHeader::FindVR: ",msg);
395 fseek(fp, PositionOnEntry, SEEK_SET);
396 // When this element is known in the dictionary we shall use, e.g. for
397 // the semantics (see the usage of IsAnInteger), the vr proposed by the
398 // dictionary entry. Still we have to flag the element as implicit since
399 // we know now our assumption on expliciteness is not furfilled.
401 if ( ElVal->IsVrUnknown() )
402 ElVal->SetVR("Implicit");
403 ElVal->SetImplicitVr();
407 * \ingroup gdcmHeader
408 * \brief Determines if the Transfer Syntax was already encountered
409 * and if it corresponds to a ImplicitVRLittleEndian one.
411 * @return True when ImplicitVRLittleEndian found. False in all other cases.
413 bool gdcmHeader::IsImplicitVRLittleEndianTransferSyntax(void) {
414 gdcmElValue* Element = PubElValSet.GetElementByNumber(0x0002, 0x0010);
417 LoadElementValueSafe(Element);
418 std::string Transfer = Element->GetValue();
419 if ( Transfer == "1.2.840.10008.1.2" )
425 * \ingroup gdcmHeader
426 * \brief Determines if the Transfer Syntax was already encountered
427 * and if it corresponds to a ExplicitVRLittleEndian one.
429 * @return True when ExplicitVRLittleEndian found. False in all other cases.
431 bool gdcmHeader::IsExplicitVRLittleEndianTransferSyntax(void) {
432 gdcmElValue* Element = PubElValSet.GetElementByNumber(0x0002, 0x0010);
435 LoadElementValueSafe(Element);
436 std::string Transfer = Element->GetValue();
437 if ( Transfer == "1.2.840.10008.1.2.1" )
443 * \ingroup gdcmHeader
444 * \brief Determines if the Transfer Syntax was already encountered
445 * and if it corresponds to a DeflatedExplicitVRLittleEndian one.
447 * @return True when DeflatedExplicitVRLittleEndian found. False in all other cases.
449 bool gdcmHeader::IsDeflatedExplicitVRLittleEndianTransferSyntax(void) {
450 gdcmElValue* Element = PubElValSet.GetElementByNumber(0x0002, 0x0010);
453 LoadElementValueSafe(Element);
454 std::string Transfer = Element->GetValue();
455 if ( Transfer == "1.2.840.10008.1.2.1.99" )
461 * \ingroup gdcmHeader
462 * \brief Determines if the Transfer Syntax was already encountered
463 * and if it corresponds to a Explicit VR Big Endian one.
465 * @return True when big endian found. False in all other cases.
467 bool gdcmHeader::IsExplicitVRBigEndianTransferSyntax(void) {
468 gdcmElValue* Element = PubElValSet.GetElementByNumber(0x0002, 0x0010);
471 LoadElementValueSafe(Element);
472 std::string Transfer = Element->GetValue();
473 if ( Transfer == "1.2.840.10008.1.2.2" ) //1.2.2 ??? A verifier !
479 * \ingroup gdcmHeader
480 * \brief Determines if the Transfer Syntax was already encountered
481 * and if it corresponds to a JPEGBaseLineProcess1 one.
483 * @return True when JPEGBaseLineProcess1found. False in all other cases.
485 bool gdcmHeader::IsJPEGBaseLineProcess1TransferSyntax(void) {
486 gdcmElValue* Element = PubElValSet.GetElementByNumber(0x0002, 0x0010);
489 LoadElementValueSafe(Element);
490 std::string Transfer = Element->GetValue();
491 if ( Transfer == "1.2.840.10008.1.2.4.50" )
497 * \ingroup gdcmHeader
502 bool gdcmHeader::IsJPEGLossless(void) {
503 gdcmElValue* Element = PubElValSet.GetElementByNumber(0x0002, 0x0010);
504 // faire qq chose d'intelligent a la place de ça
507 LoadElementValueSafe(Element);
508 const char * Transfert = Element->GetValue().c_str();
509 if ( memcmp(Transfert+strlen(Transfert)-2 ,"70",2)==0) return true;
510 if ( memcmp(Transfert+strlen(Transfert)-2 ,"55",2)==0) return true;
511 if (Element->GetValue() == "1.2.840.10008.1.2.4.57") return true;
518 * \ingroup gdcmHeader
519 * \brief Determines if the Transfer Syntax was already encountered
520 * and if it corresponds to a JPEGExtendedProcess2-4 one.
522 * @return True when JPEGExtendedProcess2-4 found. False in all other cases.
524 bool gdcmHeader::IsJPEGExtendedProcess2_4TransferSyntax(void) {
525 gdcmElValue* Element = PubElValSet.GetElementByNumber(0x0002, 0x0010);
528 LoadElementValueSafe(Element);
529 std::string Transfer = Element->GetValue();
530 if ( Transfer == "1.2.840.10008.1.2.4.51" )
536 * \ingroup gdcmHeader
537 * \brief Determines if the Transfer Syntax was already encountered
538 * and if it corresponds to a JPEGExtendeProcess3-5 one.
540 * @return True when JPEGExtendedProcess3-5 found. False in all other cases.
542 bool gdcmHeader::IsJPEGExtendedProcess3_5TransferSyntax(void) {
543 gdcmElValue* Element = PubElValSet.GetElementByNumber(0x0002, 0x0010);
546 LoadElementValueSafe(Element);
547 std::string Transfer = Element->GetValue();
548 if ( Transfer == "1.2.840.10008.1.2.4.52" )
554 * \ingroup gdcmHeader
555 * \brief Determines if the Transfer Syntax was already encountered
556 * and if it corresponds to a JPEGSpectralSelectionProcess6-8 one.
558 * @return True when JPEGSpectralSelectionProcess6-8 found. False in all
561 bool gdcmHeader::IsJPEGSpectralSelectionProcess6_8TransferSyntax(void) {
562 gdcmElValue* Element = PubElValSet.GetElementByNumber(0x0002, 0x0010);
565 LoadElementValueSafe(Element);
566 std::string Transfer = Element->GetValue();
567 if ( Transfer == "1.2.840.10008.1.2.4.53" )
573 * \ingroup gdcmHeader
574 * \brief Determines if the Transfer Syntax was already encountered
575 * and if it corresponds to a RLE Lossless one.
577 * @return True when RLE Lossless found. False in all
580 bool gdcmHeader::IsRLELossLessTransferSyntax(void) {
581 gdcmElValue* Element = PubElValSet.GetElementByNumber(0x0002, 0x0010);
584 LoadElementValueSafe(Element);
585 std::string Transfer = Element->GetValue();
586 if ( Transfer == "1.2.840.10008.1.2.5" )
592 * \ingroup gdcmHeader
593 * \brief Determines if the Transfer Syntax was already encountered
594 * and if it corresponds to a JPEG200 one.0
596 * @return True when JPEG2000 (Lossly or LossLess) found. False in all
599 bool gdcmHeader::IsJPEG2000(void) {
600 gdcmElValue* Element = PubElValSet.GetElementByNumber(0x0002, 0x0010);
603 LoadElementValueSafe(Element);
604 std::string Transfer = Element->GetValue();
605 if ( (Transfer == "1.2.840.10008.1.2.4.90")
606 || (Transfer == "1.2.840.10008.1.2.4.91") )
612 * \ingroup gdcmHeader
613 * \brief Predicate for dicom version 3 file.
614 * @return True when the file is a dicom version 3.
616 bool gdcmHeader::IsDicomV3(void) {
617 if ( (filetype == ExplicitVR)
618 || (filetype == ImplicitVR) )
624 * \ingroup gdcmHeader
625 * \brief When the length of an element value is obviously wrong (because
626 * the parser went Jabberwocky) one can hope improving things by
627 * applying this heuristic.
629 void gdcmHeader::FixFoundLength(gdcmElValue * ElVal, guint32 FoundLength) {
630 if ( FoundLength == 0xffffffff)
633 // Sorry for the patch!
634 // XMedCom did the trick to read some nasty GE images ...
635 else if (FoundLength == 13) {
636 // The following 'if' will be removed when there is no more
637 // images on Creatis HDs with a 13 length for Manufacturer...
638 if ( (ElVal->GetGroup() != 0x0008) || (ElVal->GetElement() != 0x0070)) {
639 // end of remove area
643 // to fix some garbage 'Leonardo' Siemens images
644 // May be commented out to avoid overhead
645 else if ( (ElVal->GetGroup() == 0x0009)
647 ( (ElVal->GetElement() == 0x1113) || (ElVal->GetElement() == 0x1114) ) )
650 ElVal->SetLength(FoundLength);
654 * \ingroup gdcmHeader
659 guint32 gdcmHeader::FindLengthOB(void) {
660 // See PS 3.5-2001, section A.4 p. 49 on encapsulation of encoded pixel data.
663 long PositionOnEntry = ftell(fp);
664 bool FoundSequenceDelimiter = false;
665 guint32 TotalLength = 0;
668 while ( ! FoundSequenceDelimiter) {
673 TotalLength += 4; // We even have to decount the group and element
675 if ( g != 0xfffe && g!=0xb00c ) /*for bogus header */ {
676 char msg[100]; // for sprintf. Sorry
677 sprintf(msg,"wrong group (%04x) for an item sequence (%04x,%04x)\n",g, g,n);
678 dbg.Verbose(1, "gdcmHeader::FindLengthOB: ",msg);
682 if ( n == 0xe0dd || ( g==0xb00c && n==0x0eb6 ) ) /* for bogus header */
683 FoundSequenceDelimiter = true;
684 else if ( n != 0xe000 ){
685 char msg[100]; // for sprintf. Sorry
686 sprintf(msg,"wrong element (%04x) for an item sequence (%04x,%04x)\n",
688 dbg.Verbose(1, "gdcmHeader::FindLengthOB: ",msg);
692 ItemLength = ReadInt32();
693 TotalLength += ItemLength + 4; // We add 4 bytes since we just read
694 // the ItemLength with ReadInt32
695 SkipBytes(ItemLength);
697 fseek(fp, PositionOnEntry, SEEK_SET);
702 * \ingroup gdcmHeader
707 void gdcmHeader::FindLength (gdcmElValue * ElVal) {
708 guint16 element = ElVal->GetElement();
709 guint16 group = ElVal->GetGroup();
710 std::string vr = ElVal->GetVR();
712 if( (element == 0x0010) && (group == 0x7fe0) ) {
714 dbg.Verbose(2, "gdcmHeader::FindLength: ",
715 "we reached 7fe0 0010");
718 if ( (filetype == ExplicitVR) && ! ElVal->IsImplicitVr() ) {
719 if ( (vr=="OB") || (vr=="OW") || (vr=="SQ") || (vr=="UN") ) {
721 // The following reserved two bytes (see PS 3.5-2001, section
722 // 7.1.2 Data element structure with explicit vr p27) must be
723 // skipped before proceeding on reading the length on 4 bytes.
724 fseek(fp, 2L, SEEK_CUR);
726 guint32 length32 = ReadInt32();
728 if ( (vr == "OB") && (length32 == 0xffffffff) ) {
729 ElVal->SetLength(FindLengthOB());
732 FixFoundLength(ElVal, length32);
736 // Length is encoded on 2 bytes.
737 length16 = ReadInt16();
739 // We can tell the current file is encoded in big endian (like
740 // Data/US-RGB-8-epicard) when we find the "Transfer Syntax" tag
741 // and it's value is the one of the encoding of a big endian file.
742 // In order to deal with such big endian encoded files, we have
743 // (at least) two strategies:
744 // * when we load the "Transfer Syntax" tag with value of big endian
745 // encoding, we raise the proper flags. Then we wait for the end
746 // of the META group (0x0002) among which is "Transfer Syntax",
747 // before switching the swap code to big endian. We have to postpone
748 // the switching of the swap code since the META group is fully encoded
749 // in little endian, and big endian coding only starts at the next
750 // group. The corresponding code can be hard to analyse and adds
751 // many additional unnecessary tests for regular tags.
752 // * the second strategy consists in waiting for trouble, that shall
753 // appear when we find the first group with big endian encoding. This
754 // is easy to detect since the length of a "Group Length" tag (the
755 // ones with zero as element number) has to be of 4 (0x0004). When we
756 // encouter 1024 (0x0400) chances are the encoding changed and we
757 // found a group with big endian encoding.
758 // We shall use this second strategy. In order to make sure that we
759 // can interpret the presence of an apparently big endian encoded
760 // length of a "Group Length" without committing a big mistake, we
761 // add an additional check: we look in the already parsed elements
762 // for the presence of a "Transfer Syntax" whose value has to be "big
763 // endian encoding". When this is the case, chances are we have got our
764 // hands on a big endian encoded file: we switch the swap code to
765 // big endian and proceed...
766 if ( (element == 0x0000) && (length16 == 0x0400) ) {
767 if ( ! IsExplicitVRBigEndianTransferSyntax() ) {
768 dbg.Verbose(0, "gdcmHeader::FindLength", "not explicit VR");
773 SwitchSwapToBigEndian();
774 // Restore the unproperly loaded values i.e. the group, the element
775 // and the dictionary entry depending on them.
776 guint16 CorrectGroup = SwapShort(ElVal->GetGroup());
777 guint16 CorrectElem = SwapShort(ElVal->GetElement());
778 gdcmDictEntry * NewTag = GetDictEntryByNumber(CorrectGroup,
781 // This correct tag is not in the dictionary. Create a new one.
782 NewTag = new gdcmDictEntry(CorrectGroup, CorrectElem);
784 // FIXME this can create a memory leaks on the old entry that be
785 // left unreferenced.
786 ElVal->SetDictEntry(NewTag);
789 // Heuristic: well some files are really ill-formed.
790 if ( length16 == 0xffff) {
792 //dbg.Verbose(0, "gdcmHeader::FindLength",
793 // "Erroneous element length fixed.");
794 // Actually, length= 0xffff means that we deal with
795 // Unknown Sequence Length
798 FixFoundLength(ElVal, (guint32)length16);
802 // Either implicit VR or a non DICOM conformal (see not below) explicit
803 // VR that ommited the VR of (at least) this element. Farts happen.
804 // [Note: according to the part 5, PS 3.5-2001, section 7.1 p25
805 // on Data elements "Implicit and Explicit VR Data Elements shall
806 // not coexist in a Data Set and Data Sets nested within it".]
807 // Length is on 4 bytes.
808 FixFoundLength(ElVal, ReadInt32());
812 * \ingroup gdcmHeader
813 * \brief Swaps back the bytes of 4-byte long integer accordingly to
816 * @return The suggested integer.
818 guint32 gdcmHeader::SwapLong(guint32 a) {
823 a=( ((a<<24) & 0xff000000) | ((a<<8) & 0x00ff0000) |
824 ((a>>8) & 0x0000ff00) | ((a>>24) & 0x000000ff) );
828 a=( ((a<<16) & 0xffff0000) | ((a>>16) & 0x0000ffff) );
832 a=( ((a<<8) & 0xff00ff00) | ((a>>8) & 0x00ff00ff) );
835 dbg.Error(" gdcmHeader::SwapLong : unset swap code");
842 * \ingroup gdcmHeader
843 * \brief Swaps the bytes so they agree with the processor order
844 * @return The properly swaped 16 bits integer.
846 guint16 gdcmHeader::SwapShort(guint16 a) {
847 if ( (sw==4321) || (sw==2143) )
848 a =(((a<<8) & 0x0ff00) | ((a>>8)&0x00ff));
853 * \ingroup gdcmHeader
858 void gdcmHeader::SkipBytes(guint32 NBytes) {
859 //FIXME don't dump the returned value
860 (void)fseek(fp, (long)NBytes, SEEK_CUR);
864 * \ingroup gdcmHeader
869 void gdcmHeader::SkipElementValue(gdcmElValue * ElVal) {
870 SkipBytes(ElVal->GetLength());
874 * \ingroup gdcmHeader
879 void gdcmHeader::SetMaxSizeLoadElementValue(long NewSize) {
882 if ((guint32)NewSize >= (guint32)0xffffffff) {
883 MaxSizeLoadElementValue = 0xffffffff;
886 MaxSizeLoadElementValue = NewSize;
890 * \ingroup gdcmHeader
891 * \brief Loads the element content if it's length is not bigger
892 * than the value specified with
893 * gdcmHeader::SetMaxSizeLoadElementValue()
895 void gdcmHeader::LoadElementValue(gdcmElValue * ElVal) {
897 guint16 group = ElVal->GetGroup();
898 std::string vr= ElVal->GetVR();
899 guint32 length = ElVal->GetLength();
900 bool SkipLoad = false;
902 fseek(fp, (long)ElVal->GetOffset(), SEEK_SET);
904 // FIXME Sequences not treated yet !
906 // Ne faudrait-il pas au contraire trouver immediatement
907 // une maniere 'propre' de traiter les sequences (vr = SQ)
908 // car commencer par les ignorer risque de conduire a qq chose
909 // qui pourrait ne pas etre generalisable
910 // Well, I'm expecting your code !!!
915 // Heuristic : a sequence "contains" a set of tags (called items). It looks
916 // like the last tag of a sequence (the one that terminates the sequence)
917 // has a group of 0xfffe (with a dummy length).
919 // Actually (fffe e000) tells us an Element is beginning
920 // (fffe e00d) tells us an Element just ended
921 // (fffe e0dd) tells us the current SEQuence just ended
923 if( group == 0xfffe )
928 ElVal->SetValue("gdcm::Skipped");
932 // When the length is zero things are easy:
938 // The elements whose length is bigger than the specified upper bound
939 // are not loaded. Instead we leave a short notice of the offset of
940 // the element content and it's length.
941 if (length > MaxSizeLoadElementValue) {
942 std::ostringstream s;
943 s << "gdcm::NotLoaded.";
944 s << " Address:" << (long)ElVal->GetOffset();
945 s << " Length:" << ElVal->GetLength();
946 ElVal->SetValue(s.str());
950 // When an integer is expected, read and convert the following two or
951 // four bytes properly i.e. as an integer as opposed to a string.
953 // pour les elements de Value Multiplicity > 1
954 // on aura en fait une serie d'entiers
955 // on devrait pouvoir faire + compact (?)
957 if ( IsAnInteger(ElVal) ) {
959 std::ostringstream s;
961 if (vr == "US" || vr == "SS") {
963 NewInt = ReadInt16();
966 for (int i=1; i < nbInt; i++) {
968 NewInt = ReadInt16();
973 } else if (vr == "UL" || vr == "SL") {
975 NewInt = ReadInt32();
978 for (int i=1; i < nbInt; i++) {
980 NewInt = ReadInt32();
985 ElVal->SetValue(s.str());
989 // We need an additional byte for storing \0 that is not on disk
990 char* NewValue = (char*)malloc(length+1);
992 dbg.Verbose(1, "LoadElementValue: Failed to allocate NewValue");
997 item_read = fread(NewValue, (size_t)length, (size_t)1, fp);
998 if ( item_read != 1 ) {
1000 dbg.Verbose(1, "gdcmHeader::LoadElementValue","unread element value");
1001 ElVal->SetValue("gdcm::UnRead");
1004 ElVal->SetValue(NewValue);
1009 * \ingroup gdcmHeader
1010 * \brief Loads the element while preserving the current
1011 * underlying file position indicator as opposed to
1012 * to LoadElementValue that modifies it.
1013 * @param ElVal Element whose value shall be loaded.
1016 void gdcmHeader::LoadElementValueSafe(gdcmElValue * ElVal) {
1017 long PositionOnEntry = ftell(fp);
1018 LoadElementValue(ElVal);
1019 fseek(fp, PositionOnEntry, SEEK_SET);
1023 * \ingroup gdcmHeader
1024 * \brief Reads a supposed to be 16 Bits integer
1025 * \ (swaps it depending on processor endianity)
1027 * @return integer acts as a boolean
1029 guint16 gdcmHeader::ReadInt16(void) {
1032 item_read = fread (&g, (size_t)2,(size_t)1, fp);
1033 if ( item_read != 1 ) {
1034 // dbg.Verbose(0, "gdcmHeader::ReadInt16", " Failed to read :");
1036 // dbg.Verbose(0, "gdcmHeader::ReadInt16", " End of File encountered");
1038 dbg.Verbose(0, "gdcmHeader::ReadInt16", " File Error");
1048 * \ingroup gdcmHeader
1049 * \brief Reads a supposed to be 32 Bits integer
1050 * \ (swaps it depending on processor endianity)
1054 guint32 gdcmHeader::ReadInt32(void) {
1057 item_read = fread (&g, (size_t)4,(size_t)1, fp);
1058 if ( item_read != 1 ) {
1059 //dbg.Verbose(0, "gdcmHeader::ReadInt32", " Failed to read :");
1061 // dbg.Verbose(0, "gdcmHeader::ReadInt32", " End of File encountered");
1063 dbg.Verbose(0, "gdcmHeader::ReadInt32", " File Error");
1073 * \ingroup gdcmHeader
1078 gdcmElValue* gdcmHeader::GetElValueByNumber(guint16 Group, guint16 Elem) {
1080 gdcmElValue* elValue = PubElValSet.GetElementByNumber(Group, Elem);
1082 dbg.Verbose(1, "gdcmHeader::GetElValueByNumber",
1083 "failed to Locate gdcmElValue");
1084 return (gdcmElValue*)0;
1090 * \ingroup gdcmHeader
1091 * \brief Build a new Element Value from all the low level arguments.
1092 * Check for existence of dictionary entry, and build
1093 * a default one when absent.
1094 * @param Group group of the underlying DictEntry
1095 * @param Elem element of the underlying DictEntry
1097 gdcmElValue* gdcmHeader::NewElValueByNumber(guint16 Group, guint16 Elem) {
1098 // Find out if the tag we encountered is in the dictionaries:
1099 gdcmDictEntry * NewTag = GetDictEntryByNumber(Group, Elem);
1101 NewTag = new gdcmDictEntry(Group, Elem);
1103 gdcmElValue* NewElVal = new gdcmElValue(NewTag);
1105 dbg.Verbose(1, "gdcmHeader::NewElValueByNumber",
1106 "failed to allocate gdcmElValue");
1107 return (gdcmElValue*)0;
1113 * \ingroup gdcmHeader
1118 * \return integer acts as a boolean
1120 int gdcmHeader::ReplaceOrCreateByNumber(std::string Value,
1121 guint16 Group, guint16 Elem ) {
1123 // TODO : FIXME JPRx
1125 // on (je) cree une Elvalue ne contenant pas de valeur
1126 // on l'ajoute au ElValSet
1127 // on affecte une valeur a cette ElValue a l'interieur du ElValSet
1128 // --> devrait pouvoir etre fait + simplement ???
1129 if (CheckIfExistByNumber(Group, Elem) == 0) {
1130 gdcmElValue* a =NewElValueByNumber(Group, Elem);
1135 PubElValSet.SetElValueByNumber(Value, Group, Elem);
1141 * \ingroup gdcmHeader
1142 * \brief Modify (or Creates if not found) an element
1143 * @param Value new value
1146 * \return integer acts as a boolean
1149 int gdcmHeader::ReplaceOrCreateByNumber(char* Value, guint16 Group, guint16 Elem ) {
1151 gdcmElValue* nvElValue=NewElValueByNumber(Group, Elem);
1152 PubElValSet.Add(nvElValue);
1153 std::string v = Value;
1154 PubElValSet.SetElValueByNumber(v, Group, Elem);
1160 * \ingroup gdcmHeader
1161 * \brief Set a new value if the invoked element exists
1162 * Seems to be useless !!!
1166 * \return integer acts as a boolean
1168 int gdcmHeader::ReplaceIfExistByNumber(char* Value, guint16 Group, guint16 Elem ) {
1170 //gdcmElValue* elValue = PubElValSet.GetElementByNumber(Group, Elem);
1171 std::string v = Value;
1172 PubElValSet.SetElValueByNumber(v, Group, Elem);
1178 * \ingroup gdcmHeader
1179 * \brief Checks if a given ElValue (group,number)
1180 * \ exists in the Public ElValSet
1183 * @return integer acts as a boolean
1186 int gdcmHeader::CheckIfExistByNumber(guint16 Group, guint16 Elem ) {
1187 return (PubElValSet.CheckIfExistByNumber(Group, Elem));
1191 * \ingroup gdcmHeader
1192 * \brief Build a new Element Value from all the low level arguments.
1193 * Check for existence of dictionary entry, and build
1194 * a default one when absent.
1195 * @param Name Name of the underlying DictEntry
1197 gdcmElValue* gdcmHeader::NewElValueByName(std::string Name) {
1199 gdcmDictEntry * NewTag = GetDictEntryByName(Name);
1201 NewTag = new gdcmDictEntry(0xffff, 0xffff, "LO", "Unknown", Name);
1203 gdcmElValue* NewElVal = new gdcmElValue(NewTag);
1205 dbg.Verbose(1, "gdcmHeader::ObtainElValueByName",
1206 "failed to allocate gdcmElValue");
1207 return (gdcmElValue*)0;
1213 * \ingroup gdcmHeader
1214 * \brief Read the next tag but WITHOUT loading it's value
1215 * @return On succes the newly created ElValue, NULL on failure.
1217 gdcmElValue * gdcmHeader::ReadNextElement(void) {
1220 gdcmElValue * NewElVal;
1226 // We reached the EOF (or an error occured) and header parsing
1227 // has to be considered as finished.
1228 return (gdcmElValue *)0;
1230 NewElVal = NewElValueByNumber(g, n);
1232 FindLength(NewElVal);
1235 return (gdcmElValue *)0;
1237 NewElVal->SetOffset(ftell(fp));
1238 //if ( (g==0x7fe0) && (n==0x0010) )
1243 * \ingroup gdcmHeader
1244 * \brief Apply some heuristics to predict wether the considered
1245 * element value contains/represents an integer or not.
1246 * @param ElVal The element value on which to apply the predicate.
1247 * @return The result of the heuristical predicate.
1249 bool gdcmHeader::IsAnInteger(gdcmElValue * ElVal) {
1250 guint16 element = ElVal->GetElement();
1251 std::string vr = ElVal->GetVR();
1252 guint32 length = ElVal->GetLength();
1254 // When we have some semantics on the element we just read, and if we
1255 // a priori know we are dealing with an integer, then we shall be
1256 // able to swap it's element value properly.
1257 if ( element == 0 ) { // This is the group length of the group
1261 dbg.Error("gdcmHeader::IsAnInteger",
1262 "Erroneous Group Length element length.");
1265 if ( (vr == "UL") || (vr == "US") || (vr == "SL") || (vr == "SS") )
1272 * \ingroup gdcmHeader
1273 * \brief Recover the offset (from the beginning of the file) of the pixels.
1275 size_t gdcmHeader::GetPixelOffset(void) {
1276 // If this file complies with the norm we should encounter the
1277 // "Image Location" tag (0x0028, 0x0200). This tag contains the
1278 // the group that contains the pixel data (hence the "Pixel Data"
1279 // is found by indirection through the "Image Location").
1280 // Inside the group pointed by "Image Location" the searched element
1281 // is conventionally the element 0x0010 (when the norm is respected).
1282 // When the "Image Location" is absent we default to group 0x7fe0.
1285 std::string ImageLocation = GetPubElValByName("Image Location");
1286 if ( ImageLocation == GDCM_UNFOUND ) {
1289 grPixel = (guint16) atoi( ImageLocation.c_str() );
1291 if (grPixel != 0x7fe0)
1292 // This is a kludge for old dirty Philips imager.
1297 gdcmElValue* PixelElement = PubElValSet.GetElementByNumber(grPixel,
1300 return PixelElement->GetOffset();
1306 * \ingroup gdcmHeader
1307 * \brief Searches both the public and the shadow dictionary (when they
1308 * exist) for the presence of the DictEntry with given
1309 * group and element. The public dictionary has precedence on the
1311 * @param group group of the searched DictEntry
1312 * @param element element of the searched DictEntry
1313 * @return Corresponding DictEntry when it exists, NULL otherwise.
1315 gdcmDictEntry * gdcmHeader::GetDictEntryByNumber(guint16 group,
1317 gdcmDictEntry * found = (gdcmDictEntry*)0;
1318 if (!RefPubDict && !RefShaDict) {
1319 dbg.Verbose(0, "gdcmHeader::GetDictEntry",
1320 "we SHOULD have a default dictionary");
1323 found = RefPubDict->GetTagByNumber(group, element);
1328 found = RefShaDict->GetTagByNumber(group, element);
1336 * \ingroup gdcmHeader
1337 * \brief Searches both the public and the shadow dictionary (when they
1338 * exist) for the presence of the DictEntry with given name.
1339 * The public dictionary has precedence on the shadow one.
1340 * @param Name name of the searched DictEntry
1341 * @return Corresponding DictEntry when it exists, NULL otherwise.
1343 gdcmDictEntry * gdcmHeader::GetDictEntryByName(std::string Name) {
1344 gdcmDictEntry * found = (gdcmDictEntry*)0;
1345 if (!RefPubDict && !RefShaDict) {
1346 dbg.Verbose(0, "gdcmHeader::GetDictEntry",
1347 "we SHOULD have a default dictionary");
1350 found = RefPubDict->GetTagByName(Name);
1355 found = RefShaDict->GetTagByName(Name);
1363 * \ingroup gdcmHeader
1364 * \brief Searches within the public dictionary for element value of
1366 * @param group Group of the researched tag.
1367 * @param element Element of the researched tag.
1368 * @return Corresponding element value when it exists, and the string
1369 * GDCM_UNFOUND ("gdcm::Unfound") otherwise.
1371 std::string gdcmHeader::GetPubElValByNumber(guint16 group, guint16 element) {
1372 return PubElValSet.GetElValueByNumber(group, element);
1376 * \ingroup gdcmHeader
1377 * \brief Searches within the public dictionary for element value
1378 * representation of a given tag.
1380 * Obtaining the VR (Value Representation) might be needed by caller
1381 * to convert the string typed content to caller's native type
1382 * (think of C++ vs Python). The VR is actually of a higher level
1383 * of semantics than just the native C++ type.
1384 * @param group Group of the researched tag.
1385 * @param element Element of the researched tag.
1386 * @return Corresponding element value representation when it exists,
1387 * and the string GDCM_UNFOUND ("gdcm::Unfound") otherwise.
1389 std::string gdcmHeader::GetPubElValRepByNumber(guint16 group, guint16 element) {
1390 gdcmElValue* elem = PubElValSet.GetElementByNumber(group, element);
1392 return GDCM_UNFOUND;
1393 return elem->GetVR();
1397 * \ingroup gdcmHeader
1398 * \brief Searches within the public dictionary for element value of
1400 * @param TagName name of the researched element.
1401 * @return Corresponding element value when it exists, and the string
1402 * GDCM_UNFOUND ("gdcm::Unfound") otherwise.
1404 std::string gdcmHeader::GetPubElValByName(std::string TagName) {
1405 return PubElValSet.GetElValueByName(TagName);
1409 * \ingroup gdcmHeader
1410 * \brief Searches within the elements parsed with the public dictionary for
1411 * the element value representation of a given tag.
1413 * Obtaining the VR (Value Representation) might be needed by caller
1414 * to convert the string typed content to caller's native type
1415 * (think of C++ vs Python). The VR is actually of a higher level
1416 * of semantics than just the native C++ type.
1417 * @param TagName name of the researched element.
1418 * @return Corresponding element value representation when it exists,
1419 * and the string GDCM_UNFOUND ("gdcm::Unfound") otherwise.
1421 std::string gdcmHeader::GetPubElValRepByName(std::string TagName) {
1422 gdcmElValue* elem = PubElValSet.GetElementByName(TagName);
1424 return GDCM_UNFOUND;
1425 return elem->GetVR();
1429 * \ingroup gdcmHeader
1430 * \brief Searches within elements parsed with the SHADOW dictionary
1431 * for the element value of a given tag.
1432 * @param group Group of the researched tag.
1433 * @param element Element of the researched tag.
1434 * @return Corresponding element value representation when it exists,
1435 * and the string GDCM_UNFOUND ("gdcm::Unfound") otherwise.
1437 std::string gdcmHeader::GetShaElValByNumber(guint16 group, guint16 element) {
1438 return ShaElValSet.GetElValueByNumber(group, element);
1442 * \ingroup gdcmHeader
1443 * \brief Searches within the elements parsed with the SHADOW dictionary
1444 * for the element value representation of a given tag.
1446 * Obtaining the VR (Value Representation) might be needed by caller
1447 * to convert the string typed content to caller's native type
1448 * (think of C++ vs Python). The VR is actually of a higher level
1449 * of semantics than just the native C++ type.
1450 * @param group Group of the researched tag.
1451 * @param element Element of the researched tag.
1452 * @return Corresponding element value representation when it exists,
1453 * and the string GDCM_UNFOUND ("gdcm::Unfound") otherwise.
1455 std::string gdcmHeader::GetShaElValRepByNumber(guint16 group, guint16 element) {
1456 gdcmElValue* elem = ShaElValSet.GetElementByNumber(group, element);
1458 return GDCM_UNFOUND;
1459 return elem->GetVR();
1463 * \ingroup gdcmHeader
1464 * \brief Searches within the elements parsed with the shadow dictionary
1465 * for an element value of given tag.
1466 * @param TagName name of the researched element.
1467 * @return Corresponding element value when it exists, and the string
1468 * GDCM_UNFOUND ("gdcm::Unfound") otherwise.
1470 std::string gdcmHeader::GetShaElValByName(std::string TagName) {
1471 return ShaElValSet.GetElValueByName(TagName);
1475 * \ingroup gdcmHeader
1476 * \brief Searches within the elements parsed with the shadow dictionary for
1477 * the element value representation of a given tag.
1479 * Obtaining the VR (Value Representation) might be needed by caller
1480 * to convert the string typed content to caller's native type
1481 * (think of C++ vs Python). The VR is actually of a higher level
1482 * of semantics than just the native C++ type.
1483 * @param TagName name of the researched element.
1484 * @return Corresponding element value representation when it exists,
1485 * and the string GDCM_UNFOUND ("gdcm::Unfound") otherwise.
1487 std::string gdcmHeader::GetShaElValRepByName(std::string TagName) {
1488 gdcmElValue* elem = ShaElValSet.GetElementByName(TagName);
1490 return GDCM_UNFOUND;
1491 return elem->GetVR();
1495 * \ingroup gdcmHeader
1496 * \brief Searches within elements parsed with the public dictionary
1497 * and then within the elements parsed with the shadow dictionary
1498 * for the element value of a given tag.
1499 * @param group Group of the researched tag.
1500 * @param element Element of the researched tag.
1501 * @return Corresponding element value representation when it exists,
1502 * and the string GDCM_UNFOUND ("gdcm::Unfound") otherwise.
1504 std::string gdcmHeader::GetElValByNumber(guint16 group, guint16 element) {
1505 std::string pub = GetPubElValByNumber(group, element);
1508 return GetShaElValByNumber(group, element);
1512 * \ingroup gdcmHeader
1513 * \brief Searches within elements parsed with the public dictionary
1514 * and then within the elements parsed with the shadow dictionary
1515 * for the element value representation of a given tag.
1517 * Obtaining the VR (Value Representation) might be needed by caller
1518 * to convert the string typed content to caller's native type
1519 * (think of C++ vs Python). The VR is actually of a higher level
1520 * of semantics than just the native C++ type.
1521 * @param group Group of the researched tag.
1522 * @param element Element of the researched tag.
1523 * @return Corresponding element value representation when it exists,
1524 * and the string GDCM_UNFOUND ("gdcm::Unfound") otherwise.
1526 std::string gdcmHeader::GetElValRepByNumber(guint16 group, guint16 element) {
1527 std::string pub = GetPubElValRepByNumber(group, element);
1530 return GetShaElValRepByNumber(group, element);
1534 * \ingroup gdcmHeader
1535 * \brief Searches within elements parsed with the public dictionary
1536 * and then within the elements parsed with the shadow dictionary
1537 * for the element value of a given tag.
1538 * @param TagName name of the researched element.
1539 * @return Corresponding element value when it exists,
1540 * and the string GDCM_UNFOUND ("gdcm::Unfound") otherwise.
1542 std::string gdcmHeader::GetElValByName(std::string TagName) {
1543 std::string pub = GetPubElValByName(TagName);
1546 return GetShaElValByName(TagName);
1550 * \ingroup gdcmHeader
1551 * \brief Searches within elements parsed with the public dictionary
1552 * and then within the elements parsed with the shadow dictionary
1553 * for the element value representation of a given tag.
1555 * Obtaining the VR (Value Representation) might be needed by caller
1556 * to convert the string typed content to caller's native type
1557 * (think of C++ vs Python). The VR is actually of a higher level
1558 * of semantics than just the native C++ type.
1559 * @param TagName name of the researched element.
1560 * @return Corresponding element value representation when it exists,
1561 * and the string GDCM_UNFOUND ("gdcm::Unfound") otherwise.
1563 std::string gdcmHeader::GetElValRepByName(std::string TagName) {
1564 std::string pub = GetPubElValRepByName(TagName);
1567 return GetShaElValRepByName(TagName);
1571 * \ingroup gdcmHeader
1572 * \brief Accesses an existing gdcmElValue in the PubElValSet of this instance
1573 * through it's (group, element) and modifies it's content with
1575 * @param content new value to substitute with
1576 * @param group group of the ElVal to modify
1577 * @param element element of the ElVal to modify
1579 int gdcmHeader::SetPubElValByNumber(std::string content, guint16 group,
1582 //TODO : homogeneiser les noms : SetPubElValByNumber
1583 // qui appelle PubElValSet.SetElValueByNumber
1584 // pourquoi pas SetPubElValueByNumber ??
1587 return ( PubElValSet.SetElValueByNumber (content, group, element) );
1591 * \ingroup gdcmHeader
1592 * \brief Accesses an existing gdcmElValue in the PubElValSet of this instance
1593 * through tag name and modifies it's content with the given value.
1594 * @param content new value to substitute with
1595 * @param TagName name of the tag to be modified
1597 int gdcmHeader::SetPubElValByName(std::string content, std::string TagName) {
1598 return ( PubElValSet.SetElValueByName (content, TagName) );
1602 * \ingroup gdcmHeader
1603 * \brief Accesses an existing gdcmElValue in the PubElValSet of this instance
1604 * through it's (group, element) and modifies it's length with
1606 * \warning Use with extreme caution.
1607 * @param length new length to substitute with
1608 * @param group group of the ElVal to modify
1609 * @param element element of the ElVal to modify
1610 * @return 1 on success, 0 otherwise.
1613 int gdcmHeader::SetPubElValLengthByNumber(guint32 length, guint16 group,
1615 return ( PubElValSet.SetElValueLengthByNumber (length, group, element) );
1619 * \ingroup gdcmHeader
1620 * \brief Accesses an existing gdcmElValue in the ShaElValSet of this instance
1621 * through it's (group, element) and modifies it's content with
1623 * @param content new value to substitute with
1624 * @param group group of the ElVal to modify
1625 * @param element element of the ElVal to modify
1626 * @return 1 on success, 0 otherwise.
1628 int gdcmHeader::SetShaElValByNumber(std::string content,
1629 guint16 group, guint16 element) {
1630 return ( ShaElValSet.SetElValueByNumber (content, group, element) );
1634 * \ingroup gdcmHeader
1635 * \brief Accesses an existing gdcmElValue in the ShaElValSet of this instance
1636 * through tag name and modifies it's content with the given value.
1637 * @param content new value to substitute with
1638 * @param ShadowTagName name of the tag to be modified
1640 int gdcmHeader::SetShaElValByName(std::string content, std::string ShadowTagName) {
1641 return ( ShaElValSet.SetElValueByName (content, ShadowTagName) );
1645 * \ingroup gdcmHeader
1646 * \brief Parses the header of the file but WITHOUT loading element values.
1648 void gdcmHeader::ParseHeader(bool exception_on_error) throw(gdcmFormatError) {
1649 gdcmElValue * newElValue = (gdcmElValue *)0;
1653 while ( (newElValue = ReadNextElement()) ) {
1654 SkipElementValue(newElValue);
1655 PubElValSet.Add(newElValue);
1660 * \ingroup gdcmHeader
1661 * \brief This predicate, based on hopefully reasonnable heuristics,
1662 * decides whether or not the current gdcmHeader was properly parsed
1663 * and contains the mandatory information for being considered as
1664 * a well formed and usable image.
1665 * @return true when gdcmHeader is the one of a reasonable Dicom file,
1668 bool gdcmHeader::IsReadable(void) {
1669 if ( GetElValByName("Image Dimensions") != GDCM_UNFOUND
1670 && atoi(GetElValByName("Image Dimensions").c_str()) > 4 ) {
1673 if ( GetElValByName("Bits Allocated") == GDCM_UNFOUND )
1675 if ( GetElValByName("Bits Stored") == GDCM_UNFOUND )
1677 if ( GetElValByName("High Bit") == GDCM_UNFOUND )
1679 if ( GetElValByName("Pixel Representation") == GDCM_UNFOUND )
1685 * \ingroup gdcmHeader
1686 * \brief Small utility function that creates a new manually crafted
1687 * (as opposed as read from the file) gdcmElValue with user
1688 * specified name and adds it to the public tag hash table.
1689 * \note A fake TagKey is generated so the PubDict can keep it's coherence.
1690 * @param NewTagName The name to be given to this new tag.
1691 * @param VR The Value Representation to be given to this new tag.
1692 * @ return The newly hand crafted Element Value.
1694 gdcmElValue* gdcmHeader::NewManualElValToPubDict(std::string NewTagName,
1696 gdcmElValue* NewElVal = (gdcmElValue*)0;
1697 guint32 StuffGroup = 0xffff; // Group to be stuffed with additional info
1698 guint32 FreeElem = 0;
1699 gdcmDictEntry* NewEntry = (gdcmDictEntry*)0;
1701 FreeElem = PubElValSet.GenerateFreeTagKeyInGroup(StuffGroup);
1702 if (FreeElem == UINT32_MAX) {
1703 dbg.Verbose(1, "gdcmHeader::NewManualElValToPubDict",
1704 "Group 0xffff in Public Dict is full");
1705 return (gdcmElValue*)0;
1707 NewEntry = new gdcmDictEntry(StuffGroup, FreeElem,
1708 VR, "GDCM", NewTagName);
1709 NewElVal = new gdcmElValue(NewEntry);
1710 PubElValSet.Add(NewElVal);
1715 * \ingroup gdcmHeader
1716 * \brief Loads the element values of all the elements present in the
1717 * public tag based hash table.
1719 void gdcmHeader::LoadElements(void) {
1721 TagElValueHT ht = PubElValSet.GetTagHt();
1722 for (TagElValueHT::iterator tag = ht.begin(); tag != ht.end(); ++tag) {
1723 LoadElementValue(tag->second);
1727 // Load 'non string' values
1728 std::string PhotometricInterpretation = GetPubElValByNumber(0x0028,0x0004);
1729 if( PhotometricInterpretation == "PALETTE COLOR " ){
1730 LoadElementVoidArea(0x0028,0x1200); // gray LUT
1731 LoadElementVoidArea(0x0028,0x1201); // R LUT
1732 LoadElementVoidArea(0x0028,0x1202); // G LUT
1733 LoadElementVoidArea(0x0028,0x1203); // B LUT
1735 LoadElementVoidArea(0x0028,0x1221); // Segmented Red Palette Color LUT Data
1736 LoadElementVoidArea(0x0028,0x1222); // Segmented Green Palette Color LUT Data
1737 LoadElementVoidArea(0x0028,0x1223); // Segmented Blue Palette Color LUT Data
1740 // --------------------------------------------------------------
1741 // Special Patch to allow gdcm to read ACR-LibIDO formated images
1743 // if recognition code tells us we deal with a LibIDO image
1744 // we switch lineNumber and columnNumber
1746 std::string RecCode;
1747 RecCode = GetPubElValByNumber(0x0008, 0x0010);
1748 if (RecCode == "ACRNEMA_LIBIDO_1.1" ||
1749 RecCode == "CANRME_AILIBOD1_1." ) {
1750 filetype = ACR_LIBIDO;
1751 std::string rows = GetPubElValByNumber(0x0028, 0x0010);
1752 std::string columns = GetPubElValByNumber(0x0028, 0x0011);
1753 SetPubElValByNumber(columns, 0x0028, 0x0010);
1754 SetPubElValByNumber(rows , 0x0028, 0x0011);
1756 // ----------------- End of Special Patch ----------------
1760 * \ingroup gdcmHeader
1764 void gdcmHeader::PrintPubElVal(std::ostream & os) {
1765 PubElValSet.Print(os);
1769 * \ingroup gdcmHeader
1773 void gdcmHeader::PrintPubDict(std::ostream & os) {
1774 RefPubDict->Print(os);
1778 * \ingroup gdcmHeader
1780 * @return integer, acts as a Boolean
1782 int gdcmHeader::Write(FILE * fp, FileType type) {
1785 // TODO : move the following lines (and a lot of others)
1786 // to a future function CheckAndCorrectHeader
1788 if (type == ImplicitVR) {
1789 std::string implicitVRTransfertSyntax = "1.2.840.10008.1.2";
1790 ReplaceOrCreateByNumber(implicitVRTransfertSyntax,0x0002, 0x0010);
1792 //FIXME Refer to standards on page 21, chapter 6.2 "Value representation":
1793 // values with a VR of UI shall be padded with a single trailing null
1794 // Dans le cas suivant on doit pader manuellement avec un 0
1796 PubElValSet.SetElValueLengthByNumber(18, 0x0002, 0x0010);
1799 if (type == ExplicitVR) {
1800 std::string explicitVRTransfertSyntax = "1.2.840.10008.1.2.1";
1801 ReplaceOrCreateByNumber(explicitVRTransfertSyntax,0x0002, 0x0010);
1803 //FIXME Refer to standards on page 21, chapter 6.2 "Value representation":
1804 // values with a VR of UI shall be padded with a single trailing null
1805 // Dans le cas suivant on doit pader manuellement avec un 0
1807 PubElValSet.SetElValueLengthByNumber(20, 0x0002, 0x0010);
1810 return PubElValSet.Write(fp, type);
1814 // ------------------------ 'non string' elements related functions
1818 * \ingroup gdcmHeader
1819 * \brief Loads (from disk) the element content
1820 * when a string is not suitable
1822 void * gdcmHeader::LoadElementVoidArea(guint16 Group, guint16 Elem) {
1823 gdcmElValue * Element= PubElValSet.GetElementByNumber(Group, Elem);
1826 size_t o =(size_t)Element->GetOffset();
1827 fseek(fp, o, SEEK_SET);
1828 int l=Element->GetLength();
1829 void * a = malloc(l);
1831 std::cout << "Big Broblem (LoadElementVoidArea, malloc) "
1832 << std::hex << Group << " " << Elem << std::endl;
1835 /* int res = */ PubElValSet.SetVoidAreaByNumber(a, Group, Elem);
1836 // TODO check the result
1837 size_t l2 = fread(a, 1, l ,fp);
1839 std::cout << "Big Broblem (LoadElementVoidArea, fread) "
1840 << std::hex << Group << " " << Elem << std::endl;
1848 * \ingroup gdcmHeader
1849 * \brief Gets (from Header) the offset of a 'non string' element value
1850 * \ (LoadElementValue has already be executed)
1853 * @return File Offset of the Element Value
1855 size_t gdcmHeader::GetPubElValOffsetByNumber(guint16 Group, guint16 Elem) {
1856 gdcmElValue* elValue = PubElValSet.GetElementByNumber(Group, Elem);
1858 dbg.Verbose(1, "gdcmHeader::GetElValueByNumber",
1859 "failed to Locate gdcmElValue");
1862 return elValue->GetOffset();
1866 * \ingroup gdcmHeader
1867 * \brief Gets (from Header) a 'non string' element value
1868 * \ (LoadElementValue has already be executed)
1871 * @return Pointer to the 'non string' area
1874 void * gdcmHeader::GetPubElValVoidAreaByNumber(guint16 Group, guint16 Elem) {
1875 gdcmElValue* elValue = PubElValSet.GetElementByNumber(Group, Elem);
1877 dbg.Verbose(1, "gdcmHeader::GetElValueByNumber",
1878 "failed to Locate gdcmElValue");
1881 return elValue->GetVoidArea();
1886 // =============================================================================
1887 // Heuristics based accessors
1888 //==============================================================================
1891 // TODO : move to an other file.
1895 * \ingroup gdcmHeader
1896 * \brief Retrieve the number of columns of image.
1897 * @return The encountered size when found, 0 by default.
1899 int gdcmHeader::GetXSize(void) {
1900 // We cannot check for "Columns" because the "Columns" tag is present
1901 // both in IMG (0028,0011) and OLY (6000,0011) sections of the dictionary.
1902 std::string StrSize = GetPubElValByNumber(0x0028,0x0011);
1903 if (StrSize == GDCM_UNFOUND)
1905 return atoi(StrSize.c_str());
1909 * \ingroup gdcmHeader
1910 * \brief Retrieve the number of lines of image.
1911 * \warning The defaulted value is 1 as opposed to gdcmHeader::GetXSize()
1912 * @return The encountered size when found, 1 by default.
1914 int gdcmHeader::GetYSize(void) {
1915 // We cannot check for "Rows" because the "Rows" tag is present
1916 // both in IMG (0028,0010) and OLY (6000,0010) sections of the dictionary.
1917 std::string StrSize = GetPubElValByNumber(0x0028,0x0010);
1918 if (StrSize != GDCM_UNFOUND)
1919 return atoi(StrSize.c_str());
1923 // The Rows (0028,0010) entry is optional for ACR/NEMA. It might
1924 // hence be a signal (1d image). So we default to 1:
1929 * \ingroup gdcmHeader
1930 * \brief Retrieve the number of planes of volume or the number
1931 * of frames of a multiframe.
1932 * \warning When present we consider the "Number of Frames" as the third
1933 * dimension. When absent we consider the third dimension as
1934 * being the "Planes" tag content.
1935 * @return The encountered size when found, 1 by default.
1937 int gdcmHeader::GetZSize(void) {
1938 // Both in DicomV3 and ACR/Nema the consider the "Number of Frames"
1939 // as the third dimension.
1940 std::string StrSize = GetPubElValByNumber(0x0028,0x0008);
1941 if (StrSize != GDCM_UNFOUND)
1942 return atoi(StrSize.c_str());
1944 // We then consider the "Planes" entry as the third dimension [we
1945 // cannot retrieve by name since "Planes tag is present both in
1946 // IMG (0028,0012) and OLY (6000,0012) sections of the dictionary].
1947 StrSize = GetPubElValByNumber(0x0028,0x0012);
1948 if (StrSize != GDCM_UNFOUND)
1949 return atoi(StrSize.c_str());
1954 * \ingroup gdcmHeader
1955 * \brief Retrieve the number of Bits Stored
1956 * (as opposite to number of Bits Allocated)
1958 * @return The encountered number of Bits Stored, 0 by default.
1960 int gdcmHeader::GetBitsStored(void) {
1961 std::string StrSize = GetPubElValByNumber(0x0028,0x0101);
1962 if (StrSize == GDCM_UNFOUND)
1964 return atoi(StrSize.c_str());
1968 * \ingroup gdcmHeader
1969 * \brief Retrieve the number of Bits Allocated
1970 * (8, 12 -compacted ACR-NEMA files, 16, ...)
1972 * @return The encountered number of Bits Allocated, 0 by default.
1974 int gdcmHeader::GetBitsAllocated(void) {
1975 std::string StrSize = GetPubElValByNumber(0x0028,0x0100);
1976 if (StrSize == GDCM_UNFOUND)
1978 return atoi(StrSize.c_str());
1982 * \ingroup gdcmHeader
1983 * \brief Retrieve the number of Samples Per Pixel
1984 * (1 : gray level, 3 : RGB)
1986 * @return The encountered number of Samples Per Pixel, 1 by default.
1988 int gdcmHeader::GetSamplesPerPixel(void) {
1989 std::string StrSize = GetPubElValByNumber(0x0028,0x0002);
1990 if (StrSize == GDCM_UNFOUND)
1991 return 1; // Well, it's supposed to be mandatory ...
1992 return atoi(StrSize.c_str());
1996 * \ingroup gdcmHeader
1997 * \brief Retrieve the Planar Configuration for RGB images
1998 * (0 : RGB Pixels , 1 : R Plane + G Plane + B Plane)
2000 * @return The encountered Planar Configuration, 0 by default.
2002 int gdcmHeader::GetPlanarConfiguration(void) {
2003 std::string StrSize = GetPubElValByNumber(0x0028,0x0006);
2004 if (StrSize == GDCM_UNFOUND)
2006 return atoi(StrSize.c_str());
2010 * \ingroup gdcmHeader
2011 * \brief Return the size (in bytes) of a single pixel of data.
2012 * @return The size in bytes of a single pixel of data.
2015 int gdcmHeader::GetPixelSize(void) {
2016 std::string PixelType = GetPixelType();
2017 if (PixelType == "8U" || PixelType == "8S")
2019 if (PixelType == "16U" || PixelType == "16S")
2021 if (PixelType == "32U" || PixelType == "32S")
2023 dbg.Verbose(0, "gdcmHeader::GetPixelSize: Unknown pixel type");
2028 * \ingroup gdcmHeader
2029 * \brief Build the Pixel Type of the image.
2030 * Possible values are:
2031 * - 8U unsigned 8 bit,
2032 * - 8S signed 8 bit,
2033 * - 16U unsigned 16 bit,
2034 * - 16S signed 16 bit,
2035 * - 32U unsigned 32 bit,
2036 * - 32S signed 32 bit,
2037 * \warning 12 bit images appear as 16 bit.
2040 std::string gdcmHeader::GetPixelType(void) {
2041 std::string BitsAlloc;
2042 BitsAlloc = GetElValByName("Bits Allocated");
2043 if (BitsAlloc == GDCM_UNFOUND) {
2044 dbg.Verbose(0, "gdcmHeader::GetPixelType: unfound Bits Allocated");
2045 BitsAlloc = std::string("16");
2047 if (BitsAlloc == "12")
2048 BitsAlloc = std::string("16");
2051 Signed = GetElValByName("Pixel Representation");
2052 if (Signed == GDCM_UNFOUND) {
2053 dbg.Verbose(0, "gdcmHeader::GetPixelType: unfound Pixel Representation");
2054 BitsAlloc = std::string("0");
2057 Signed = std::string("U");
2059 Signed = std::string("S");
2061 return( BitsAlloc + Signed);
2065 * \ingroup gdcmHeader
2066 * \brief gets the info from 0002,0010 : Transfert Syntax
2068 * @return Transfert Syntax Name (as oposite to Transfert Syntax UID)
2070 std::string gdcmHeader::GetTransferSyntaxName(void) {
2071 std::string TransfertSyntax = GetPubElValByNumber(0x0002,0x0010);
2072 if (TransfertSyntax == GDCM_UNFOUND) {
2073 dbg.Verbose(0, "gdcmHeader::GetTransferSyntaxName: unfound Transfert Syntax (0002,0010)");
2074 return "Uncompressed ACR-NEMA";
2076 // we do it only when we need it
2077 gdcmTS * ts = gdcmGlobal::GetTS();
2078 std::string tsName=ts->GetValue(TransfertSyntax);
2079 //delete ts; // Seg Fault when deleted ?!
2083 // -------------------------------- Lookup Table related functions ------------
2086 * \ingroup gdcmHeader
2087 * \brief gets the info from 0028,1101 : Lookup Table Desc-Red
2089 * @return Lookup Table Length
2090 * \ when (0028,0004),Photometric Interpretation = [PALETTE COLOR ]
2093 int gdcmHeader::GetLUTLength(void) {
2094 std::vector<std::string> tokens;
2098 // Just hope Lookup Table Desc-Red = Lookup Table Desc-Red = Lookup Table Desc-Blue
2099 std::string LutDescriptionR = GetPubElValByNumber(0x0028,0x1101);
2100 if (LutDescriptionR == GDCM_UNFOUND)
2102 std::string LutDescriptionG = GetPubElValByNumber(0x0028,0x1102);
2103 if (LutDescriptionG == GDCM_UNFOUND)
2105 std::string LutDescriptionB = GetPubElValByNumber(0x0028,0x1103);
2106 if (LutDescriptionB == GDCM_UNFOUND)
2108 if( (LutDescriptionR != LutDescriptionG) || (LutDescriptionR != LutDescriptionB) ) {
2109 dbg.Verbose(0, "gdcmHeader::GetLUTLength: The CLUT R,G,B are not equal");
2112 std::cout << "Lut Description " << LutDescriptionR <<std::endl;
2113 tokens.erase(tokens.begin(),tokens.end()); // clean any previous value
2114 Tokenize (LutDescriptionR, tokens, "\\");
2115 LutLength=atoi(tokens[0].c_str());
2116 //LutDepth=atoi(tokens[1].c_str());
2117 //LutNbits=atoi(tokens[2].c_str());
2123 * \ingroup gdcmHeader
2124 * \brief gets the info from 0028,1101 : Lookup Table Desc-Red
2126 * @return Lookup Table nBit
2127 * \ when (0028,0004),Photometric Interpretation = [PALETTE COLOR ]
2130 int gdcmHeader::GetLUTNbits(void) {
2131 std::vector<std::string> tokens;
2135 //Just hope Lookup Table Desc-Red = Lookup Table Desc-Red = Lookup Table Desc-Blue
2136 // Consistency already checked in GetLUTLength
2137 std::string LutDescription = GetPubElValByNumber(0x0028,0x1101);
2138 if (LutDescription == GDCM_UNFOUND)
2140 tokens.erase(tokens.begin(),tokens.end()); // clean any previous value
2141 Tokenize (LutDescription, tokens, "\\");
2142 //LutLength=atoi(tokens[0].c_str());
2143 //LutDepth=atoi(tokens[1].c_str());
2144 LutNbits=atoi(tokens[2].c_str());
2151 * \ingroup gdcmHeader
2152 * \brief gets the info from 0028,1201 : Lookup Table Red
2154 * @return Lookup Table Red
2155 * \ when (0028,0004),Photometric Interpretation = [PALETTE COLOR ]
2157 void * gdcmHeader::GetLUTRed(void) {
2158 return GetPubElValVoidAreaByNumber(0x0028,0x1201);
2162 * \ingroup gdcmHeader
2163 * \brief gets the info from 0028,1202 : Lookup Table Green
2165 * @return Lookup Table Red
2166 * \ when (0028,0004),Photometric Interpretation = [PALETTE COLOR ]
2168 void * gdcmHeader::GetLUTGreen(void) {
2169 return GetPubElValVoidAreaByNumber(0x0028,0x1202);
2173 * \ingroup gdcmHeader
2174 * \brief gets the info from 0028,1202 : Lookup Table Blue
2176 * @return Lookup Table Blue
2177 * \ when (0028,0004),Photometric Interpretation = [PALETTE COLOR ]
2179 void * gdcmHeader::GetLUTBlue(void) {
2180 return GetPubElValVoidAreaByNumber(0x0028,0x1203);
2184 * \ingroup gdcmHeader
2186 * @return Lookup Table RGB
2187 * \ when (0028,0004),Photometric Interpretation = [PALETTE COLOR ]
2188 * \ and (0028,1201),(0028,1202),(0028,1202) are found
2189 * \warning : hazardous ! Use better GetPubElValVoidAreaByNumber
2191 void * gdcmHeader::GetLUTRGB(void) {
2192 // Not so easy : see
2193 // http://www.barre.nom.fr/medical/dicom2/limitations.html#Color%20Lookup%20Tables
2194 // and OT-PAL-8-face.dcm
2196 if (GetPubElValByNumber(0x0028,0x0004) == GDCM_UNFOUND) {
2197 dbg.Verbose(0, "gdcmHeader::GetLUTRGB: unfound Photometric Interpretation");
2200 void * LutR,*LutG,*LutB;
2203 // Maybe, some day we get an image
2204 // that respects the definition ...
2205 // Let's consider no ones does.
2210 int nBits=GetLUTNbits();
2212 // a virer quand on aura trouve UNE image
2213 // qui correspond VRAIMENT à la definition !
2214 std::cout << "l " << l << " nBits " << nBits;
2218 LutR =GetPubElValVoidAreaByNumber(0x0028,0x1201);
2219 LutG =GetPubElValVoidAreaByNumber(0x0028,0x1202);
2220 LutB =GetPubElValVoidAreaByNumber(0x0028,0x1203);
2222 // Warning : Any value for nBits as to be considered as 8
2223 // Any value for Length as to be considered as 256
2226 // Just wait before removing the following code
2229 guint16 * LUTRGB, *rgb;
2230 LUTRGB = rgb = (guint16 *) malloc(3*l*sizeof( guint16));
2231 guint16 * r = (guint16 *)LutR;
2232 guint16 * g = (guint16 *)LutG;
2233 guint16 * b = (guint16 *)LutB;
2234 for(int i=0;i<l;i++) {
2242 */ { // we assume it's always 8 Bits
2243 l=256; // we assume ...
2244 unsigned char * LUTRGB, *rgb;
2245 LUTRGB = rgb = (unsigned char *) malloc(3*l*sizeof( char));
2246 unsigned char * r = (unsigned char *)LutR;
2247 unsigned char * g = (unsigned char *)LutG;
2248 unsigned char * b = (unsigned char *)LutB;
2249 for(int i=0;i<l;i++) {
2250 //std::cout << "lut16 " << i << " : " << *r << " " << *g << " " << *b
2252 printf("lut 8 %d : %d %d %d \n",i,*r,*g,*b);
2257 free(LutR); free(LutB); free(LutG);
2261 /* Sorry for the comments. The code will be moved in a fonction
2263 std::string x=GetPubElValByNumber(0x0028,0x1201);
2264 unsigned short int * lutR = (unsigned short int *)malloc((size_t)200*sizeof(short int));
2265 unsigned short int * lutG = (unsigned short int *)malloc((size_t)200*sizeof(short int));
2266 unsigned short int * lutB = (unsigned short int *)malloc((size_t)200*sizeof(short int));
2268 std::vector<std::string> tokens;
2269 tokens.erase(tokens.begin(),tokens.end()); // clean any previous value
2270 Tokenize ((const std::string)x, tokens, "\\");
2271 for (unsigned int i=0; i<tokens.size();i++) {
2272 lutR[i] = atoi(tokens[i].c_str());
2273 printf("%d (%x)\n",lutR[i],lutR[i]);
2276 std::string y=GetPubElValByNumber(0x0028,0x1202);
2277 tokens.erase(tokens.begin(),tokens.end()); // clean any previous value
2278 Tokenize ((const std::string)y, tokens, "\\");
2279 for (unsigned int i=0; i<tokens.size();i++) {
2280 lutG[i] = atoi(tokens[i].c_str());
2283 std::string z=GetPubElValByNumber(0x0028,0x1203);
2284 tokens.erase(tokens.begin(),tokens.end()); // clean any previous value
2285 Tokenize ((const std::string)z, tokens, "\\");
2286 for (unsigned int i=0; i<tokens.size();i++) {
2287 lutB[i] = atoi(tokens[i].c_str());
2289 tokens.erase(tokens.begin(),tokens.end()); // clean any previous value
2290 Tokenize ((const std::string)x, tokens, "\\");
2291 for (unsigned int i=0; i<tokens.size();i++) {
2292 lutB[i] = atoi(tokens[i].c_str());
2297 //int lgth=GetLUTLength();
2298 //cout << "lgth " << lgth << std::endl;;
2299 //for (int j=0;j<lgth;j++){
2300 //printf ("%d : %d (%x) %d (%x) %d (%x)\n",j,lutR[j],lutR[j],lutG[j],lutG[j],lutB[j],lutB[j]);