1 // $Header: /cvs/public/gdcm/src/Attic/gdcmHeader.cxx,v 1.114 2003/11/12 14:06:34 malaterre 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) {
631 ElVal->SetReadLength(FoundLength); // will be updated only if a bug is found
633 if ( FoundLength == 0xffffffff)
636 // Sorry for the patch!
637 // XMedCom did the trick to read some nasty GE images ...
638 else if (FoundLength == 13) {
639 // The following 'if' will be removed when there is no more
640 // images on Creatis HDs with a 13 length for Manufacturer...
641 if ( (ElVal->GetGroup() != 0x0008) &&
642 ( (ElVal->GetElement() != 0x0070) || (ElVal->GetElement() != 0x0080) ) ) {
643 // end of remove area
645 ElVal->SetReadLength(10); // a bug is to be fixed
648 // to fix some garbage 'Leonardo' Siemens images
649 // May be commented out to avoid overhead
650 else if ( (ElVal->GetGroup() == 0x0009)
652 ( (ElVal->GetElement() == 0x1113) || (ElVal->GetElement() == 0x1114) ) ){
654 ElVal->SetReadLength(4); // a bug is to be fixed
658 // to try to 'go inside' SeQuences (with length), and not to ship them
659 else if ( ElVal->GetVR() == "SQ") {
663 // a SeQuence Element is beginning
664 // Let's forget it's length
665 // (we want to 'go inside')
666 else if(ElVal->GetGroup() == 0xfffe){
670 ElVal->SetUsableLength(FoundLength);
674 * \ingroup gdcmHeader
679 guint32 gdcmHeader::FindLengthOB(void) {
680 // See PS 3.5-2001, section A.4 p. 49 on encapsulation of encoded pixel data.
683 long PositionOnEntry = ftell(fp);
684 bool FoundSequenceDelimiter = false;
685 guint32 TotalLength = 0;
688 while ( ! FoundSequenceDelimiter) {
693 TotalLength += 4; // We even have to decount the group and element
695 if ( g != 0xfffe && g!=0xb00c ) /*for bogus header */ {
696 char msg[100]; // for sprintf. Sorry
697 sprintf(msg,"wrong group (%04x) for an item sequence (%04x,%04x)\n",g, g,n);
698 dbg.Verbose(1, "gdcmHeader::FindLengthOB: ",msg);
702 if ( n == 0xe0dd || ( g==0xb00c && n==0x0eb6 ) ) /* for bogus header */
703 FoundSequenceDelimiter = true;
704 else if ( n != 0xe000 ){
705 char msg[100]; // for sprintf. Sorry
706 sprintf(msg,"wrong element (%04x) for an item sequence (%04x,%04x)\n",
708 dbg.Verbose(1, "gdcmHeader::FindLengthOB: ",msg);
712 ItemLength = ReadInt32();
713 TotalLength += ItemLength + 4; // We add 4 bytes since we just read
714 // the ItemLength with ReadInt32
715 SkipBytes(ItemLength);
717 fseek(fp, PositionOnEntry, SEEK_SET);
722 * \ingroup gdcmHeader
727 void gdcmHeader::FindLength (gdcmElValue * ElVal) {
728 guint16 element = ElVal->GetElement();
729 guint16 group = ElVal->GetGroup();
730 std::string vr = ElVal->GetVR();
732 if( (element == 0x0010) && (group == 0x7fe0) ) {
734 dbg.Verbose(2, "gdcmHeader::FindLength: ",
735 "we reached 7fe0 0010");
738 if ( (filetype == ExplicitVR) && ! ElVal->IsImplicitVr() ) {
739 if ( (vr=="OB") || (vr=="OW") || (vr=="SQ") || (vr=="UN") ) {
741 // The following reserved two bytes (see PS 3.5-2001, section
742 // 7.1.2 Data element structure with explicit vr p27) must be
743 // skipped before proceeding on reading the length on 4 bytes.
744 fseek(fp, 2L, SEEK_CUR);
746 guint32 length32 = ReadInt32();
748 if ( (vr == "OB") && (length32 == 0xffffffff) ) {
749 ElVal->SetLength(FindLengthOB());
752 FixFoundLength(ElVal, length32);
756 // Length is encoded on 2 bytes.
757 length16 = ReadInt16();
759 // We can tell the current file is encoded in big endian (like
760 // Data/US-RGB-8-epicard) when we find the "Transfer Syntax" tag
761 // and it's value is the one of the encoding of a big endian file.
762 // In order to deal with such big endian encoded files, we have
763 // (at least) two strategies:
764 // * when we load the "Transfer Syntax" tag with value of big endian
765 // encoding, we raise the proper flags. Then we wait for the end
766 // of the META group (0x0002) among which is "Transfer Syntax",
767 // before switching the swap code to big endian. We have to postpone
768 // the switching of the swap code since the META group is fully encoded
769 // in little endian, and big endian coding only starts at the next
770 // group. The corresponding code can be hard to analyse and adds
771 // many additional unnecessary tests for regular tags.
772 // * the second strategy consists in waiting for trouble, that shall
773 // appear when we find the first group with big endian encoding. This
774 // is easy to detect since the length of a "Group Length" tag (the
775 // ones with zero as element number) has to be of 4 (0x0004). When we
776 // encounter 1024 (0x0400) chances are the encoding changed and we
777 // found a group with big endian encoding.
778 // We shall use this second strategy. In order to make sure that we
779 // can interpret the presence of an apparently big endian encoded
780 // length of a "Group Length" without committing a big mistake, we
781 // add an additional check: we look in the already parsed elements
782 // for the presence of a "Transfer Syntax" whose value has to be "big
783 // endian encoding". When this is the case, chances are we have got our
784 // hands on a big endian encoded file: we switch the swap code to
785 // big endian and proceed...
786 if ( (element == 0x0000) && (length16 == 0x0400) ) {
787 if ( ! IsExplicitVRBigEndianTransferSyntax() ) {
788 dbg.Verbose(0, "gdcmHeader::FindLength", "not explicit VR");
793 SwitchSwapToBigEndian();
794 // Restore the unproperly loaded values i.e. the group, the element
795 // and the dictionary entry depending on them.
796 guint16 CorrectGroup = SwapShort(ElVal->GetGroup());
797 guint16 CorrectElem = SwapShort(ElVal->GetElement());
798 gdcmDictEntry * NewTag = GetDictEntryByNumber(CorrectGroup,
801 // This correct tag is not in the dictionary. Create a new one.
802 NewTag = new gdcmDictEntry(CorrectGroup, CorrectElem);
804 // FIXME this can create a memory leaks on the old entry that be
805 // left unreferenced.
806 ElVal->SetDictEntry(NewTag);
809 // Heuristic: well some files are really ill-formed.
810 if ( length16 == 0xffff) {
812 //dbg.Verbose(0, "gdcmHeader::FindLength",
813 // "Erroneous element length fixed.");
814 // Actually, length= 0xffff means that we deal with
815 // Unknown Sequence Length
818 FixFoundLength(ElVal, (guint32)length16);
822 // Either implicit VR or a non DICOM conformal (see not below) explicit
823 // VR that ommited the VR of (at least) this element. Farts happen.
824 // [Note: according to the part 5, PS 3.5-2001, section 7.1 p25
825 // on Data elements "Implicit and Explicit VR Data Elements shall
826 // not coexist in a Data Set and Data Sets nested within it".]
827 // Length is on 4 bytes.
828 FixFoundLength(ElVal, ReadInt32());
833 * \ingroup gdcmHeader
834 * \brief Swaps back the bytes of 4-byte long integer accordingly to
836 * @return The properly swaped 32 bits integer.
838 guint32 gdcmHeader::SwapLong(guint32 a) {
843 a=( ((a<<24) & 0xff000000) | ((a<<8) & 0x00ff0000) |
844 ((a>>8) & 0x0000ff00) | ((a>>24) & 0x000000ff) );
848 a=( ((a<<16) & 0xffff0000) | ((a>>16) & 0x0000ffff) );
852 a=( ((a<<8) & 0xff00ff00) | ((a>>8) & 0x00ff00ff) );
855 dbg.Error(" gdcmHeader::SwapLong : unset swap code");
862 * \ingroup gdcmHeader
863 * \brief Swaps the bytes so they agree with the processor order
864 * @return The properly swaped 16 bits integer.
866 guint16 gdcmHeader::SwapShort(guint16 a) {
867 if ( (sw==4321) || (sw==2143) )
868 a =(((a<<8) & 0x0ff00) | ((a>>8)&0x00ff));
873 * \ingroup gdcmHeader
878 void gdcmHeader::SkipBytes(guint32 NBytes) {
879 //FIXME don't dump the returned value
880 (void)fseek(fp, (long)NBytes, SEEK_CUR);
884 * \ingroup gdcmHeader
889 void gdcmHeader::SkipElementValue(gdcmElValue * ElVal) {
890 SkipBytes(ElVal->GetLength());
894 * \ingroup gdcmHeader
899 void gdcmHeader::SetMaxSizeLoadElementValue(long NewSize) {
902 if ((guint32)NewSize >= (guint32)0xffffffff) {
903 MaxSizeLoadElementValue = 0xffffffff;
906 MaxSizeLoadElementValue = NewSize;
910 * \ingroup gdcmHeader
911 * \brief Loads the element content if it's length is not bigger
912 * than the value specified with
913 * gdcmHeader::SetMaxSizeLoadElementValue()
915 void gdcmHeader::LoadElementValue(gdcmElValue * ElVal) {
917 guint16 group = ElVal->GetGroup();
918 std::string vr= ElVal->GetVR();
919 guint32 length = ElVal->GetLength();
920 bool SkipLoad = false;
922 fseek(fp, (long)ElVal->GetOffset(), SEEK_SET);
924 // FIXME Sequences not treated yet !
926 // Ne faudrait-il pas au contraire trouver immediatement
927 // une maniere 'propre' de traiter les sequences (vr = SQ)
928 // car commencer par les ignorer risque de conduire a qq chose
929 // qui pourrait ne pas etre generalisable
930 // Well, I'm expecting your code !!!
932 // the test was commented out to 'go inside' the SeQuences
933 // we don't any longer skip them !
938 // A SeQuence "contains" a set of Elements.
939 // (fffe e000) tells us an Element is beginning
940 // (fffe e00d) tells us an Element just ended
941 // (fffe e0dd) tells us the current SeQuence just ended
943 if( group == 0xfffe )
948 ElVal->SetValue("gdcm::Skipped");
952 // When the length is zero things are easy:
958 // The elements whose length is bigger than the specified upper bound
959 // are not loaded. Instead we leave a short notice of the offset of
960 // the element content and it's length.
961 if (length > MaxSizeLoadElementValue) {
962 std::ostringstream s;
963 s << "gdcm::NotLoaded.";
964 s << " Address:" << (long)ElVal->GetOffset();
965 s << " Length:" << ElVal->GetLength();
966 s << " x(" << std::hex << ElVal->GetLength() << ")";
967 ElVal->SetValue(s.str());
971 // When an integer is expected, read and convert the following two or
972 // four bytes properly i.e. as an integer as opposed to a string.
974 // Actually, elements with Value Multiplicity > 1
975 // contain a set of integers (not a single one)
976 // Any compacter code suggested (?)
978 if ( IsAnInteger(ElVal) ) {
980 std::ostringstream s;
982 if (vr == "US" || vr == "SS") {
984 NewInt = ReadInt16();
987 for (int i=1; i < nbInt; i++) {
989 NewInt = ReadInt16();
994 } else if (vr == "UL" || vr == "SL") {
996 NewInt = ReadInt32();
999 for (int i=1; i < nbInt; i++) {
1001 NewInt = ReadInt32();
1006 ElVal->SetValue(s.str());
1010 // We need an additional byte for storing \0 that is not on disk
1011 char* NewValue = (char*)malloc(length+1);
1013 dbg.Verbose(1, "LoadElementValue: Failed to allocate NewValue");
1016 NewValue[length]= 0;
1018 item_read = fread(NewValue, (size_t)length, (size_t)1, fp);
1019 if ( item_read != 1 ) {
1021 dbg.Verbose(1, "gdcmHeader::LoadElementValue","unread element value");
1022 ElVal->SetValue("gdcm::UnRead");
1025 ElVal->SetValue(NewValue);
1030 * \ingroup gdcmHeader
1031 * \brief Loads the element while preserving the current
1032 * underlying file position indicator as opposed to
1033 * to LoadElementValue that modifies it.
1034 * @param ElVal Element whose value shall be loaded.
1037 void gdcmHeader::LoadElementValueSafe(gdcmElValue * ElVal) {
1038 long PositionOnEntry = ftell(fp);
1039 LoadElementValue(ElVal);
1040 fseek(fp, PositionOnEntry, SEEK_SET);
1044 * \ingroup gdcmHeader
1045 * \brief Reads a supposed to be 16 Bits integer
1046 * \ (swaps it depending on processor endianity)
1048 * @return integer acts as a boolean
1050 guint16 gdcmHeader::ReadInt16(void) {
1053 item_read = fread (&g, (size_t)2,(size_t)1, fp);
1054 if ( item_read != 1 ) {
1055 // dbg.Verbose(0, "gdcmHeader::ReadInt16", " Failed to read :");
1057 // dbg.Verbose(0, "gdcmHeader::ReadInt16", " End of File encountered");
1059 dbg.Verbose(0, "gdcmHeader::ReadInt16", " File Error");
1069 * \ingroup gdcmHeader
1070 * \brief Reads a supposed to be 32 Bits integer
1071 * \ (swaps it depending on processor endianity)
1075 guint32 gdcmHeader::ReadInt32(void) {
1078 item_read = fread (&g, (size_t)4,(size_t)1, fp);
1079 if ( item_read != 1 ) {
1080 //dbg.Verbose(0, "gdcmHeader::ReadInt32", " Failed to read :");
1082 // dbg.Verbose(0, "gdcmHeader::ReadInt32", " End of File encountered");
1084 dbg.Verbose(0, "gdcmHeader::ReadInt32", " File Error");
1094 * \ingroup gdcmHeader
1099 gdcmElValue* gdcmHeader::GetElValueByNumber(guint16 Group, guint16 Elem) {
1101 gdcmElValue* elValue = PubElValSet.GetElementByNumber(Group, Elem);
1103 dbg.Verbose(1, "gdcmHeader::GetElValueByNumber",
1104 "failed to Locate gdcmElValue");
1105 return (gdcmElValue*)0;
1111 * \ingroup gdcmHeader
1112 * \brief Build a new Element Value from all the low level arguments.
1113 * Check for existence of dictionary entry, and build
1114 * a default one when absent.
1115 * @param Group group of the underlying DictEntry
1116 * @param Elem element of the underlying DictEntry
1118 gdcmElValue* gdcmHeader::NewElValueByNumber(guint16 Group, guint16 Elem) {
1119 // Find out if the tag we encountered is in the dictionaries:
1120 gdcmDictEntry * NewTag = GetDictEntryByNumber(Group, Elem);
1122 NewTag = new gdcmDictEntry(Group, Elem);
1124 gdcmElValue* NewElVal = new gdcmElValue(NewTag);
1126 dbg.Verbose(1, "gdcmHeader::NewElValueByNumber",
1127 "failed to allocate gdcmElValue");
1128 return (gdcmElValue*)0;
1134 * \ingroup gdcmHeader
1139 * \return integer acts as a boolean
1141 int gdcmHeader::ReplaceOrCreateByNumber(std::string Value,
1142 guint16 Group, guint16 Elem ) {
1143 // TODO : FIXME JPRx
1145 // on (je) cree une Elvalue ne contenant pas de valeur
1146 // on l'ajoute au ElValSet
1147 // on affecte une valeur a cette ElValue a l'interieur du ElValSet
1148 // --> devrait pouvoir etre fait + simplement ???
1149 if (CheckIfExistByNumber(Group, Elem) == 0) {
1150 gdcmElValue* a =NewElValueByNumber(Group, Elem);
1155 PubElValSet.SetElValueByNumber(Value, Group, Elem);
1161 * \ingroup gdcmHeader
1162 * \brief Modify (or Creates if not found) an element
1163 * @param Value new value
1166 * \return integer acts as a boolean
1169 int gdcmHeader::ReplaceOrCreateByNumber(char* Value, guint16 Group, guint16 Elem ) {
1171 gdcmElValue* nvElValue=NewElValueByNumber(Group, Elem);
1172 PubElValSet.Add(nvElValue);
1173 std::string v = Value;
1174 PubElValSet.SetElValueByNumber(v, Group, Elem);
1180 * \ingroup gdcmHeader
1181 * \brief Set a new value if the invoked element exists
1182 * Seems to be useless !!!
1186 * \return integer acts as a boolean
1188 int gdcmHeader::ReplaceIfExistByNumber(char* Value, guint16 Group, guint16 Elem ) {
1190 //gdcmElValue* elValue = PubElValSet.GetElementByNumber(Group, Elem);
1191 std::string v = Value;
1192 PubElValSet.SetElValueByNumber(v, Group, Elem);
1198 * \ingroup gdcmHeader
1199 * \brief Checks if a given ElValue (group,number)
1200 * \ exists in the Public ElValSet
1203 * @return integer acts as a boolean
1206 int gdcmHeader::CheckIfExistByNumber(guint16 Group, guint16 Elem ) {
1207 return (PubElValSet.CheckIfExistByNumber(Group, Elem));
1211 * \ingroup gdcmHeader
1212 * \brief Build a new Element Value from all the low level arguments.
1213 * Check for existence of dictionary entry, and build
1214 * a default one when absent.
1215 * @param Name Name of the underlying DictEntry
1217 gdcmElValue* gdcmHeader::NewElValueByName(std::string Name) {
1219 gdcmDictEntry * NewTag = GetDictEntryByName(Name);
1221 NewTag = new gdcmDictEntry(0xffff, 0xffff, "LO", "Unknown", Name);
1223 gdcmElValue* NewElVal = new gdcmElValue(NewTag);
1225 dbg.Verbose(1, "gdcmHeader::ObtainElValueByName",
1226 "failed to allocate gdcmElValue");
1227 return (gdcmElValue*)0;
1233 * \ingroup gdcmHeader
1234 * \brief Read the next tag but WITHOUT loading it's value
1235 * @return On succes the newly created ElValue, NULL on failure.
1237 gdcmElValue * gdcmHeader::ReadNextElement(void) {
1240 gdcmElValue * NewElVal;
1246 // We reached the EOF (or an error occured) and header parsing
1247 // has to be considered as finished.
1248 return (gdcmElValue *)0;
1250 NewElVal = NewElValueByNumber(g, n);
1252 FindLength(NewElVal);
1256 return (gdcmElValue *)0;
1258 NewElVal->SetOffset(ftell(fp));
1259 //if ( (g==0x7fe0) && (n==0x0010) )
1264 * \ingroup gdcmHeader
1265 * \brief Apply some heuristics to predict wether the considered
1266 * element value contains/represents an integer or not.
1267 * @param ElVal The element value on which to apply the predicate.
1268 * @return The result of the heuristical predicate.
1270 bool gdcmHeader::IsAnInteger(gdcmElValue * ElVal) {
1271 guint16 element = ElVal->GetElement();
1272 std::string vr = ElVal->GetVR();
1273 guint32 length = ElVal->GetLength();
1275 // When we have some semantics on the element we just read, and if we
1276 // a priori know we are dealing with an integer, then we shall be
1277 // able to swap it's element value properly.
1278 if ( element == 0 ) { // This is the group length of the group
1282 dbg.Error("gdcmHeader::IsAnInteger",
1283 "Erroneous Group Length element length.");
1286 if ( (vr == "UL") || (vr == "US") || (vr == "SL") || (vr == "SS") )
1293 * \ingroup gdcmHeader
1294 * \brief Recover the offset (from the beginning of the file) of the pixels.
1296 size_t gdcmHeader::GetPixelOffset(void) {
1297 // If this file complies with the norm we should encounter the
1298 // "Image Location" tag (0x0028, 0x0200). This tag contains the
1299 // the group that contains the pixel data (hence the "Pixel Data"
1300 // is found by indirection through the "Image Location").
1301 // Inside the group pointed by "Image Location" the searched element
1302 // is conventionally the element 0x0010 (when the norm is respected).
1303 // When the "Image Location" is absent we default to group 0x7fe0.
1306 std::string ImageLocation = GetPubElValByName("Image Location");
1307 if ( ImageLocation == GDCM_UNFOUND ) {
1310 grPixel = (guint16) atoi( ImageLocation.c_str() );
1312 if (grPixel != 0x7fe0)
1313 // This is a kludge for old dirty Philips imager.
1318 gdcmElValue* PixelElement = PubElValSet.GetElementByNumber(grPixel,
1321 return PixelElement->GetOffset();
1327 * \ingroup gdcmHeader
1328 * \brief Recover the pixel area length (in Bytes) .
1330 size_t gdcmHeader::GetPixelAreaLength(void) {
1331 // If this file complies with the norm we should encounter the
1332 // "Image Location" tag (0x0028, 0x0200). This tag contains the
1333 // the group that contains the pixel data (hence the "Pixel Data"
1334 // is found by indirection through the "Image Location").
1335 // Inside the group pointed by "Image Location" the searched element
1336 // is conventionally the element 0x0010 (when the norm is respected).
1337 // When the "Image Location" is absent we default to group 0x7fe0.
1340 std::string ImageLocation = GetPubElValByName("Image Location");
1341 if ( ImageLocation == GDCM_UNFOUND ) {
1344 grPixel = (guint16) atoi( ImageLocation.c_str() );
1346 if (grPixel != 0x7fe0)
1347 // This is a kludge for old dirty Philips imager.
1352 gdcmElValue* PixelElement = PubElValSet.GetElementByNumber(grPixel,
1355 return PixelElement->GetLength();
1361 * \ingroup gdcmHeader
1362 * \brief Searches both the public and the shadow dictionary (when they
1363 * exist) for the presence of the DictEntry with given
1364 * group and element. The public dictionary has precedence on the
1366 * @param group group of the searched DictEntry
1367 * @param element element of the searched DictEntry
1368 * @return Corresponding DictEntry when it exists, NULL otherwise.
1370 gdcmDictEntry * gdcmHeader::GetDictEntryByNumber(guint16 group,
1372 gdcmDictEntry * found = (gdcmDictEntry*)0;
1373 if (!RefPubDict && !RefShaDict) {
1374 dbg.Verbose(0, "gdcmHeader::GetDictEntry",
1375 "we SHOULD have a default dictionary");
1378 found = RefPubDict->GetTagByNumber(group, element);
1383 found = RefShaDict->GetTagByNumber(group, element);
1391 * \ingroup gdcmHeader
1392 * \brief Searches both the public and the shadow dictionary (when they
1393 * exist) for the presence of the DictEntry with given name.
1394 * The public dictionary has precedence on the shadow one.
1395 * @param Name name of the searched DictEntry
1396 * @return Corresponding DictEntry when it exists, NULL otherwise.
1398 gdcmDictEntry * gdcmHeader::GetDictEntryByName(std::string Name) {
1399 gdcmDictEntry * found = (gdcmDictEntry*)0;
1400 if (!RefPubDict && !RefShaDict) {
1401 dbg.Verbose(0, "gdcmHeader::GetDictEntry",
1402 "we SHOULD have a default dictionary");
1405 found = RefPubDict->GetTagByName(Name);
1410 found = RefShaDict->GetTagByName(Name);
1418 * \ingroup gdcmHeader
1419 * \brief Searches within the public dictionary for element value of
1421 * @param group Group of the researched tag.
1422 * @param element Element of the researched tag.
1423 * @return Corresponding element value when it exists, and the string
1424 * GDCM_UNFOUND ("gdcm::Unfound") otherwise.
1426 std::string gdcmHeader::GetPubElValByNumber(guint16 group, guint16 element) {
1427 return PubElValSet.GetElValueByNumber(group, element);
1431 * \ingroup gdcmHeader
1432 * \brief Searches within the public dictionary for element value
1433 * representation of a given tag.
1435 * Obtaining the VR (Value Representation) might be needed by caller
1436 * to convert the string typed content to caller's native type
1437 * (think of C++ vs Python). The VR is actually of a higher level
1438 * of semantics than just the native C++ type.
1439 * @param group Group of the researched tag.
1440 * @param element Element of the researched tag.
1441 * @return Corresponding element value representation when it exists,
1442 * and the string GDCM_UNFOUND ("gdcm::Unfound") otherwise.
1444 std::string gdcmHeader::GetPubElValRepByNumber(guint16 group, guint16 element) {
1445 gdcmElValue* elem = PubElValSet.GetElementByNumber(group, element);
1447 return GDCM_UNFOUND;
1448 return elem->GetVR();
1452 * \ingroup gdcmHeader
1453 * \brief Searches within the public dictionary for element value of
1455 * @param TagName name of the searched element.
1456 * @return Corresponding element value when it exists, and the string
1457 * GDCM_UNFOUND ("gdcm::Unfound") otherwise.
1459 std::string gdcmHeader::GetPubElValByName(std::string TagName) {
1460 return PubElValSet.GetElValueByName(TagName);
1464 * \ingroup gdcmHeader
1465 * \brief Searches within the elements parsed with the public dictionary for
1466 * the element value representation of a given tag.
1468 * Obtaining the VR (Value Representation) might be needed by caller
1469 * to convert the string typed content to caller's native type
1470 * (think of C++ vs Python). The VR is actually of a higher level
1471 * of semantics than just the native C++ type.
1472 * @param TagName name of the searched element.
1473 * @return Corresponding element value representation when it exists,
1474 * and the string GDCM_UNFOUND ("gdcm::Unfound") otherwise.
1476 std::string gdcmHeader::GetPubElValRepByName(std::string TagName) {
1477 gdcmElValue* elem = PubElValSet.GetElementByName(TagName);
1479 return GDCM_UNFOUND;
1480 return elem->GetVR();
1484 * \ingroup gdcmHeader
1485 * \brief Searches within elements parsed with the SHADOW dictionary
1486 * for the element value of a given tag.
1487 * @param group Group of the searched tag.
1488 * @param element Element of the searched tag.
1489 * @return Corresponding element value representation when it exists,
1490 * and the string GDCM_UNFOUND ("gdcm::Unfound") otherwise.
1492 std::string gdcmHeader::GetShaElValByNumber(guint16 group, guint16 element) {
1493 return ShaElValSet.GetElValueByNumber(group, element);
1497 * \ingroup gdcmHeader
1498 * \brief Searches within the elements parsed with the SHADOW dictionary
1499 * for the element value representation of a given tag.
1501 * Obtaining the VR (Value Representation) might be needed by caller
1502 * to convert the string typed content to caller's native type
1503 * (think of C++ vs Python). The VR is actually of a higher level
1504 * of semantics than just the native C++ type.
1505 * @param group Group of the searched tag.
1506 * @param element Element of the searched tag.
1507 * @return Corresponding element value representation when it exists,
1508 * and the string GDCM_UNFOUND ("gdcm::Unfound") otherwise.
1510 std::string gdcmHeader::GetShaElValRepByNumber(guint16 group, guint16 element) {
1511 gdcmElValue* elem = ShaElValSet.GetElementByNumber(group, element);
1513 return GDCM_UNFOUND;
1514 return elem->GetVR();
1518 * \ingroup gdcmHeader
1519 * \brief Searches within the elements parsed with the shadow dictionary
1520 * for an element value of given tag.
1521 * @param TagName name of the searched element.
1522 * @return Corresponding element value when it exists, and the string
1523 * GDCM_UNFOUND ("gdcm::Unfound") otherwise.
1525 std::string gdcmHeader::GetShaElValByName(std::string TagName) {
1526 return ShaElValSet.GetElValueByName(TagName);
1530 * \ingroup gdcmHeader
1531 * \brief Searches within the elements parsed with the shadow dictionary for
1532 * the element value representation of a given tag.
1534 * Obtaining the VR (Value Representation) might be needed by caller
1535 * to convert the string typed content to caller's native type
1536 * (think of C++ vs Python). The VR is actually of a higher level
1537 * of semantics than just the native C++ type.
1538 * @param TagName name of the searched element.
1539 * @return Corresponding element value representation when it exists,
1540 * and the string GDCM_UNFOUND ("gdcm::Unfound") otherwise.
1542 std::string gdcmHeader::GetShaElValRepByName(std::string TagName) {
1543 gdcmElValue* elem = ShaElValSet.GetElementByName(TagName);
1545 return GDCM_UNFOUND;
1546 return elem->GetVR();
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 of a given tag.
1554 * @param group Group of the searched tag.
1555 * @param element Element of the searched tag.
1556 * @return Corresponding element value representation when it exists,
1557 * and the string GDCM_UNFOUND ("gdcm::Unfound") otherwise.
1559 std::string gdcmHeader::GetElValByNumber(guint16 group, guint16 element) {
1560 std::string pub = GetPubElValByNumber(group, element);
1563 return GetShaElValByNumber(group, element);
1567 * \ingroup gdcmHeader
1568 * \brief Searches within elements parsed with the public dictionary
1569 * and then within the elements parsed with the shadow dictionary
1570 * for the element value representation of a given tag.
1572 * Obtaining the VR (Value Representation) might be needed by caller
1573 * to convert the string typed content to caller's native type
1574 * (think of C++ vs Python). The VR is actually of a higher level
1575 * of semantics than just the native C++ type.
1576 * @param group Group of the searched tag.
1577 * @param element Element of the searched tag.
1578 * @return Corresponding element value representation when it exists,
1579 * and the string GDCM_UNFOUND ("gdcm::Unfound") otherwise.
1581 std::string gdcmHeader::GetElValRepByNumber(guint16 group, guint16 element) {
1582 std::string pub = GetPubElValRepByNumber(group, element);
1585 return GetShaElValRepByNumber(group, element);
1589 * \ingroup gdcmHeader
1590 * \brief Searches within elements parsed with the public dictionary
1591 * and then within the elements parsed with the shadow dictionary
1592 * for the element value of a given tag.
1593 * @param TagName name of the searched element.
1594 * @return Corresponding element value when it exists,
1595 * and the string GDCM_UNFOUND ("gdcm::Unfound") otherwise.
1597 std::string gdcmHeader::GetElValByName(std::string TagName) {
1598 std::string pub = GetPubElValByName(TagName);
1601 return GetShaElValByName(TagName);
1605 * \ingroup gdcmHeader
1606 * \brief Searches within elements parsed with the public dictionary
1607 * and then within the elements parsed with the shadow dictionary
1608 * for the element value representation of a given tag.
1610 * Obtaining the VR (Value Representation) might be needed by caller
1611 * to convert the string typed content to caller's native type
1612 * (think of C++ vs Python). The VR is actually of a higher level
1613 * of semantics than just the native C++ type.
1614 * @param TagName name of the searched element.
1615 * @return Corresponding element value representation when it exists,
1616 * and the string GDCM_UNFOUND ("gdcm::Unfound") otherwise.
1618 std::string gdcmHeader::GetElValRepByName(std::string TagName) {
1619 std::string pub = GetPubElValRepByName(TagName);
1622 return GetShaElValRepByName(TagName);
1626 * \ingroup gdcmHeader
1627 * \brief Accesses an existing gdcmElValue in the PubElValSet of this instance
1628 * through it's (group, element) and modifies it's content with
1630 * @param content new value to substitute with
1631 * @param group group of the ElVal to modify
1632 * @param element element of the ElVal to modify
1634 int gdcmHeader::SetPubElValByNumber(std::string content, guint16 group,
1637 //TODO : homogeneiser les noms : SetPubElValByNumber
1638 // qui appelle PubElValSet.SetElValueByNumber
1639 // pourquoi pas SetPubElValueByNumber ??
1642 return ( PubElValSet.SetElValueByNumber (content, group, element) );
1646 * \ingroup gdcmHeader
1647 * \brief Accesses an existing gdcmElValue in the PubElValSet of this instance
1648 * through tag name and modifies it's content with the given value.
1649 * @param content new value to substitute with
1650 * @param TagName name of the tag to be modified
1652 int gdcmHeader::SetPubElValByName(std::string content, std::string TagName) {
1653 return ( PubElValSet.SetElValueByName (content, TagName) );
1657 * \ingroup gdcmHeader
1658 * \brief Accesses an existing gdcmElValue in the PubElValSet of this instance
1659 * through it's (group, element) and modifies it's length with
1661 * \warning Use with extreme caution.
1662 * @param length new length to substitute with
1663 * @param group group of the ElVal to modify
1664 * @param element element of the ElVal to modify
1665 * @return 1 on success, 0 otherwise.
1668 int gdcmHeader::SetPubElValLengthByNumber(guint32 length, guint16 group,
1670 return ( PubElValSet.SetElValueLengthByNumber (length, group, element) );
1674 * \ingroup gdcmHeader
1675 * \brief Accesses an existing gdcmElValue in the ShaElValSet of this instance
1676 * through it's (group, element) and modifies it's content with
1678 * @param content new value to substitute with
1679 * @param group group of the ElVal to modify
1680 * @param element element of the ElVal to modify
1681 * @return 1 on success, 0 otherwise.
1683 int gdcmHeader::SetShaElValByNumber(std::string content,
1684 guint16 group, guint16 element) {
1685 return ( ShaElValSet.SetElValueByNumber (content, group, element) );
1689 * \ingroup gdcmHeader
1690 * \brief Accesses an existing gdcmElValue in the ShaElValSet of this instance
1691 * through tag name and modifies it's content with the given value.
1692 * @param content new value to substitute with
1693 * @param ShadowTagName name of the tag to be modified
1695 int gdcmHeader::SetShaElValByName(std::string content, std::string ShadowTagName) {
1696 return ( ShaElValSet.SetElValueByName (content, ShadowTagName) );
1700 * \ingroup gdcmHeader
1701 * \brief Parses the header of the file but WITHOUT loading element values.
1703 void gdcmHeader::ParseHeader(bool exception_on_error) throw(gdcmFormatError) {
1704 gdcmElValue * newElValue = (gdcmElValue *)0;
1708 while ( (newElValue = ReadNextElement()) ) {
1709 SkipElementValue(newElValue);
1710 PubElValSet.Add(newElValue);
1715 * \ingroup gdcmHeader
1716 * \brief This predicate, based on hopefully reasonable heuristics,
1717 * decides whether or not the current gdcmHeader was properly parsed
1718 * and contains the mandatory information for being considered as
1719 * a well formed and usable image.
1720 * @return true when gdcmHeader is the one of a reasonable Dicom file,
1723 bool gdcmHeader::IsReadable(void) {
1724 if ( GetElValByName("Image Dimensions") != GDCM_UNFOUND
1725 && atoi(GetElValByName("Image Dimensions").c_str()) > 4 ) {
1728 if ( GetElValByName("Bits Allocated") == GDCM_UNFOUND )
1730 if ( GetElValByName("Bits Stored") == GDCM_UNFOUND )
1732 if ( GetElValByName("High Bit") == GDCM_UNFOUND )
1734 if ( GetElValByName("Pixel Representation") == GDCM_UNFOUND )
1740 * \ingroup gdcmHeader
1741 * \brief Small utility function that creates a new manually crafted
1742 * (as opposed as read from the file) gdcmElValue with user
1743 * specified name and adds it to the public tag hash table.
1744 * \note A fake TagKey is generated so the PubDict can keep it's coherence.
1745 * @param NewTagName The name to be given to this new tag.
1746 * @param VR The Value Representation to be given to this new tag.
1747 * @ return The newly hand crafted Element Value.
1749 gdcmElValue* gdcmHeader::NewManualElValToPubDict(std::string NewTagName,
1751 gdcmElValue* NewElVal = (gdcmElValue*)0;
1752 guint32 StuffGroup = 0xffff; // Group to be stuffed with additional info
1753 guint32 FreeElem = 0;
1754 gdcmDictEntry* NewEntry = (gdcmDictEntry*)0;
1756 FreeElem = PubElValSet.GenerateFreeTagKeyInGroup(StuffGroup);
1757 if (FreeElem == UINT32_MAX) {
1758 dbg.Verbose(1, "gdcmHeader::NewManualElValToPubDict",
1759 "Group 0xffff in Public Dict is full");
1760 return (gdcmElValue*)0;
1762 NewEntry = new gdcmDictEntry(StuffGroup, FreeElem,
1763 VR, "GDCM", NewTagName);
1764 NewElVal = new gdcmElValue(NewEntry);
1765 PubElValSet.Add(NewElVal);
1770 * \ingroup gdcmHeader
1771 * \brief Loads the element values of all the elements present in the
1772 * public tag based hash table.
1774 void gdcmHeader::LoadElements(void) {
1777 // We don't use any longer the HashTable, since a lot a stuff is missing
1778 // when SeQuences were encountered
1780 //TagElValueHT ht = PubElValSet.GetTagHt();
1781 //for (TagElValueHT::iterator tag = ht.begin(); tag != ht.end(); ++tag) {
1782 // LoadElementValue(tag->second);
1785 for (std::list<gdcmElValue*>::iterator i = GetListElem().begin();
1786 i != GetListElem().end();
1788 LoadElementValue(*i);
1793 // Load 'non string' values
1794 std::string PhotometricInterpretation = GetPubElValByNumber(0x0028,0x0004);
1795 if( PhotometricInterpretation == "PALETTE COLOR " ){
1796 LoadElementVoidArea(0x0028,0x1200); // gray LUT
1797 LoadElementVoidArea(0x0028,0x1201); // R LUT
1798 LoadElementVoidArea(0x0028,0x1202); // G LUT
1799 LoadElementVoidArea(0x0028,0x1203); // B LUT
1801 LoadElementVoidArea(0x0028,0x1221); // Segmented Red Palette Color LUT Data
1802 LoadElementVoidArea(0x0028,0x1222); // Segmented Green Palette Color LUT Data
1803 LoadElementVoidArea(0x0028,0x1223); // Segmented Blue Palette Color LUT Data
1806 // --------------------------------------------------------------
1807 // Special Patch to allow gdcm to read ACR-LibIDO formated images
1809 // if recognition code tells us we deal with a LibIDO image
1810 // we switch lineNumber and columnNumber
1812 std::string RecCode;
1813 RecCode = GetPubElValByNumber(0x0008, 0x0010);
1814 if (RecCode == "ACRNEMA_LIBIDO_1.1" ||
1815 RecCode == "CANRME_AILIBOD1_1." ) {
1816 filetype = ACR_LIBIDO;
1817 std::string rows = GetPubElValByNumber(0x0028, 0x0010);
1818 std::string columns = GetPubElValByNumber(0x0028, 0x0011);
1819 SetPubElValByNumber(columns, 0x0028, 0x0010);
1820 SetPubElValByNumber(rows , 0x0028, 0x0011);
1822 // ----------------- End of Special Patch ----------------
1826 * \ingroup gdcmHeader
1830 void gdcmHeader::PrintPubElVal(std::ostream & os) {
1831 PubElValSet.Print(os);
1835 * \ingroup gdcmHeader
1839 void gdcmHeader::PrintPubDict(std::ostream & os) {
1840 RefPubDict->Print(os);
1844 * \ingroup gdcmHeader
1846 * @return integer, acts as a Boolean
1848 int gdcmHeader::Write(FILE * fp, FileType type) {
1850 // TODO : move the following lines (and a lot of others, to be written)
1851 // to a future function CheckAndCorrectHeader
1853 if (type == ImplicitVR) {
1854 std::string implicitVRTransfertSyntax = "1.2.840.10008.1.2";
1855 ReplaceOrCreateByNumber(implicitVRTransfertSyntax,0x0002, 0x0010);
1857 //FIXME Refer to standards on page 21, chapter 6.2 "Value representation":
1858 // values with a VR of UI shall be padded with a single trailing null
1859 // Dans le cas suivant on doit pader manuellement avec un 0
1861 PubElValSet.SetElValueLengthByNumber(18, 0x0002, 0x0010);
1864 if (type == ExplicitVR) {
1865 std::string explicitVRTransfertSyntax = "1.2.840.10008.1.2.1";
1866 ReplaceOrCreateByNumber(explicitVRTransfertSyntax,0x0002, 0x0010);
1868 //FIXME Refer to standards on page 21, chapter 6.2 "Value representation":
1869 // values with a VR of UI shall be padded with a single trailing null
1870 // Dans le cas suivant on doit pader manuellement avec un 0
1872 PubElValSet.SetElValueLengthByNumber(20, 0x0002, 0x0010);
1875 return PubElValSet.Write(fp, type);
1879 // ------------------------ 'non string' elements related functions
1883 * \ingroup gdcmHeader
1884 * \brief Loads (from disk) the element content
1885 * when a string is not suitable
1887 void * gdcmHeader::LoadElementVoidArea(guint16 Group, guint16 Elem) {
1888 gdcmElValue * Element= PubElValSet.GetElementByNumber(Group, Elem);
1891 size_t o =(size_t)Element->GetOffset();
1892 fseek(fp, o, SEEK_SET);
1893 int l=Element->GetLength();
1894 void * a = malloc(l);
1896 std::cout << "Big Broblem (LoadElementVoidArea, malloc) "
1897 << std::hex << Group << " " << Elem << std::endl;
1900 /* int res = */ PubElValSet.SetVoidAreaByNumber(a, Group, Elem);
1901 // TODO check the result
1902 size_t l2 = fread(a, 1, l ,fp);
1904 std::cout << "Big Broblem (LoadElementVoidArea, fread) "
1905 << std::hex << Group << " " << Elem << std::endl;
1913 * \ingroup gdcmHeader
1914 * \brief Gets (from Header) the offset of a 'non string' element value
1915 * \ (LoadElementValue has already be executed)
1918 * @return File Offset of the Element Value
1920 size_t gdcmHeader::GetPubElValOffsetByNumber(guint16 Group, guint16 Elem) {
1921 gdcmElValue* elValue = PubElValSet.GetElementByNumber(Group, Elem);
1923 dbg.Verbose(1, "gdcmHeader::GetElValueByNumber",
1924 "failed to Locate gdcmElValue");
1927 return elValue->GetOffset();
1931 * \ingroup gdcmHeader
1932 * \brief Gets (from Header) a 'non string' element value
1933 * \ (LoadElementValue has already be executed)
1936 * @return Pointer to the 'non string' area
1939 void * gdcmHeader::GetPubElValVoidAreaByNumber(guint16 Group, guint16 Elem) {
1940 gdcmElValue* elValue = PubElValSet.GetElementByNumber(Group, Elem);
1942 dbg.Verbose(1, "gdcmHeader::GetElValueByNumber",
1943 "failed to Locate gdcmElValue");
1946 return elValue->GetVoidArea();
1951 // =============================================================================
1952 // Heuristics based accessors
1953 //==============================================================================
1956 // TODO : move to an other file.
1960 * \ingroup gdcmHeader
1961 * \brief Retrieve the number of columns of image.
1962 * @return The encountered size when found, 0 by default.
1964 int gdcmHeader::GetXSize(void) {
1965 // We cannot check for "Columns" because the "Columns" tag is present
1966 // both in IMG (0028,0011) and OLY (6000,0011) sections of the dictionary.
1967 std::string StrSize = GetPubElValByNumber(0x0028,0x0011);
1968 if (StrSize == GDCM_UNFOUND)
1970 return atoi(StrSize.c_str());
1974 * \ingroup gdcmHeader
1975 * \brief Retrieve the number of lines of image.
1976 * \warning The defaulted value is 1 as opposed to gdcmHeader::GetXSize()
1977 * @return The encountered size when found, 1 by default.
1979 int gdcmHeader::GetYSize(void) {
1980 // We cannot check for "Rows" because the "Rows" tag is present
1981 // both in IMG (0028,0010) and OLY (6000,0010) sections of the dictionary.
1982 std::string StrSize = GetPubElValByNumber(0x0028,0x0010);
1983 if (StrSize != GDCM_UNFOUND)
1984 return atoi(StrSize.c_str());
1988 // The Rows (0028,0010) entry is optional for ACR/NEMA. It might
1989 // hence be a signal (1d image). So we default to 1:
1994 * \ingroup gdcmHeader
1995 * \brief Retrieve the number of planes of volume or the number
1996 * of frames of a multiframe.
1997 * \warning When present we consider the "Number of Frames" as the third
1998 * dimension. When absent we consider the third dimension as
1999 * being the "Planes" tag content.
2000 * @return The encountered size when found, 1 by default.
2002 int gdcmHeader::GetZSize(void) {
2003 // Both in DicomV3 and ACR/Nema the consider the "Number of Frames"
2004 // as the third dimension.
2005 std::string StrSize = GetPubElValByNumber(0x0028,0x0008);
2006 if (StrSize != GDCM_UNFOUND)
2007 return atoi(StrSize.c_str());
2009 // We then consider the "Planes" entry as the third dimension [we
2010 // cannot retrieve by name since "Planes tag is present both in
2011 // IMG (0028,0012) and OLY (6000,0012) sections of the dictionary].
2012 StrSize = GetPubElValByNumber(0x0028,0x0012);
2013 if (StrSize != GDCM_UNFOUND)
2014 return atoi(StrSize.c_str());
2019 * \ingroup gdcmHeader
2020 * \brief Retrieve the number of Bits Stored
2021 * (as opposite to number of Bits Allocated)
2023 * @return The encountered number of Bits Stored, 0 by default.
2025 int gdcmHeader::GetBitsStored(void) {
2026 std::string StrSize = GetPubElValByNumber(0x0028,0x0101);
2027 if (StrSize == GDCM_UNFOUND)
2029 return atoi(StrSize.c_str());
2033 * \ingroup gdcmHeader
2034 * \brief Retrieve the number of Bits Allocated
2035 * (8, 12 -compacted ACR-NEMA files, 16, ...)
2037 * @return The encountered number of Bits Allocated, 0 by default.
2039 int gdcmHeader::GetBitsAllocated(void) {
2040 std::string StrSize = GetPubElValByNumber(0x0028,0x0100);
2041 if (StrSize == GDCM_UNFOUND)
2043 return atoi(StrSize.c_str());
2047 * \ingroup gdcmHeader
2048 * \brief Retrieve the number of Samples Per Pixel
2049 * (1 : gray level, 3 : RGB -1 or 3 Planes-)
2051 * @return The encountered number of Samples Per Pixel, 1 by default.
2053 int gdcmHeader::GetSamplesPerPixel(void) {
2054 std::string StrSize = GetPubElValByNumber(0x0028,0x0002);
2055 if (StrSize == GDCM_UNFOUND)
2056 return 1; // Well, it's supposed to be mandatory ...
2057 return atoi(StrSize.c_str());
2061 * \ingroup gdcmHeader
2062 * \brief Retrieve the Planar Configuration for RGB images
2063 * (0 : RGB Pixels , 1 : R Plane + G Plane + B Plane)
2065 * @return The encountered Planar Configuration, 0 by default.
2067 int gdcmHeader::GetPlanarConfiguration(void) {
2068 std::string StrSize = GetPubElValByNumber(0x0028,0x0006);
2069 if (StrSize == GDCM_UNFOUND)
2071 return atoi(StrSize.c_str());
2075 * \ingroup gdcmHeader
2076 * \brief Return the size (in bytes) of a single pixel of data.
2077 * @return The size in bytes of a single pixel of data.
2080 int gdcmHeader::GetPixelSize(void) {
2081 std::string PixelType = GetPixelType();
2082 if (PixelType == "8U" || PixelType == "8S")
2084 if (PixelType == "16U" || PixelType == "16S")
2086 if (PixelType == "32U" || PixelType == "32S")
2088 dbg.Verbose(0, "gdcmHeader::GetPixelSize: Unknown pixel type");
2093 * \ingroup gdcmHeader
2094 * \brief Build the Pixel Type of the image.
2095 * Possible values are:
2096 * - 8U unsigned 8 bit,
2097 * - 8S signed 8 bit,
2098 * - 16U unsigned 16 bit,
2099 * - 16S signed 16 bit,
2100 * - 32U unsigned 32 bit,
2101 * - 32S signed 32 bit,
2102 * \warning 12 bit images appear as 16 bit.
2103 * \ 24 bit images appear as 8 bit
2106 std::string gdcmHeader::GetPixelType(void) {
2107 std::string BitsAlloc;
2108 BitsAlloc = GetElValByName("Bits Allocated");
2109 if (BitsAlloc == GDCM_UNFOUND) {
2110 dbg.Verbose(0, "gdcmHeader::GetPixelType: unfound Bits Allocated");
2111 BitsAlloc = std::string("16");
2113 if (BitsAlloc == "12") // It will be unpacked
2114 BitsAlloc = std::string("16");
2115 else if (BitsAlloc == "24") // (in order no to be messed up
2116 BitsAlloc = std::string("8"); // by old RGB images)
2119 Signed = GetElValByName("Pixel Representation");
2120 if (Signed == GDCM_UNFOUND) {
2121 dbg.Verbose(0, "gdcmHeader::GetPixelType: unfound Pixel Representation");
2122 BitsAlloc = std::string("0");
2125 Signed = std::string("U");
2128 std::cout << "GetPixelType : " << BitsAlloc + Signed << std::endl;
2129 Signed = std::string("S");
2131 return( BitsAlloc + Signed);
2135 * \ingroup gdcmHeader
2136 * \brief gets the info from 0002,0010 : Transfert Syntax
2138 * @return Transfert Syntax Name (as oposite to Transfert Syntax UID)
2140 std::string gdcmHeader::GetTransferSyntaxName(void) {
2141 std::string TransfertSyntax = GetPubElValByNumber(0x0002,0x0010);
2142 if (TransfertSyntax == GDCM_UNFOUND) {
2143 dbg.Verbose(0, "gdcmHeader::GetTransferSyntaxName: unfound Transfert Syntax (0002,0010)");
2144 return "Uncompressed ACR-NEMA";
2146 // we do it only when we need it
2147 gdcmTS * ts = gdcmGlobal::GetTS();
2148 std::string tsName=ts->GetValue(TransfertSyntax);
2149 //delete ts; // Seg Fault when deleted ?!
2153 // -------------------------------- Lookup Table related functions ------------
2156 * \ingroup gdcmHeader
2157 * \brief tells us if LUT are used
2158 * \warning Right now, Segmented xxx Palette Color Lookup Table Data
2159 * \ are NOT considered as LUT, since nobody knows
2160 *\ how to deal with them
2161 * @return int acts as a Boolean
2164 int gdcmHeader::HasLUT(void) {
2166 // Check the presence of the LUT Descriptors
2167 if (GetPubElValByNumber(0x0028,0x1101) == GDCM_UNFOUND)
2169 // LutDescriptorGreen
2170 if (GetPubElValByNumber(0x0028,0x1102) == GDCM_UNFOUND)
2172 // LutDescriptorBlue
2173 if (GetPubElValByNumber(0x0028,0x1103) == GDCM_UNFOUND)
2177 if (GetPubElValByNumber(0x0028,0x1201) == GDCM_UNFOUND)
2179 if (GetPubElValByNumber(0x0028,0x1202) == GDCM_UNFOUND)
2181 if (GetPubElValByNumber(0x0028,0x1203) == GDCM_UNFOUND)
2187 * \ingroup gdcmHeader
2188 * \brief gets the info from 0028,1101 : Lookup Table Desc-Red
2190 * @return Lookup Table nBit
2191 * \ when (0028,0004),Photometric Interpretation = [PALETTE COLOR ]
2194 int gdcmHeader::GetLUTNbits(void) {
2195 std::vector<std::string> tokens;
2199 //Just hope Lookup Table Desc-Red = Lookup Table Desc-Red = Lookup Table Desc-Blue
2200 // Consistency already checked in GetLUTLength
2201 std::string LutDescription = GetPubElValByNumber(0x0028,0x1101);
2202 if (LutDescription == GDCM_UNFOUND)
2204 tokens.erase(tokens.begin(),tokens.end()); // clean any previous value
2205 Tokenize (LutDescription, tokens, "\\");
2206 //LutLength=atoi(tokens[0].c_str());
2207 //LutDepth=atoi(tokens[1].c_str());
2208 LutNbits=atoi(tokens[2].c_str());
2214 * \ingroup gdcmHeader
2215 * \brief builts Red/Green/Blue/Alpha LUT from Header
2216 * \ when (0028,0004),Photometric Interpretation = [PALETTE COLOR ]
2217 * \ and (0028,1101),(0028,1102),(0028,1102)
2218 * \ - xxx Palette Color Lookup Table Descriptor - are found
2219 * \ and (0028,1201),(0028,1202),(0028,1202)
2220 * \ - xxx Palette Color Lookup Table Data - are found
2221 * \warning does NOT deal with :
2222 * \ 0028 1100 Gray Lookup Table Descriptor (Retired)
2223 * \ 0028 1221 Segmented Red Palette Color Lookup Table Data
2224 * \ 0028 1222 Segmented Green Palette Color Lookup Table Data
2225 * \ 0028 1223 Segmented Blue Palette Color Lookup Table Data
2226 * \ no known Dicom reader deails with them :-(
2227 * @return Lookup Table RGBA
2230 void * gdcmHeader::GetLUTRGBA(void) {
2231 // Not so easy : see
2232 // http://www.barre.nom.fr/medical/dicom2/limitations.html#Color%20Lookup%20Tables
2233 // and OT-PAL-8-face.dcm
2235 // if Photometric Interpretation # PALETTE COLOR, no LUT to be done
2237 if (gdcmHeader::GetPubElValByNumber(0x0028,0x0004) != "PALETTE COLOR ") {
2241 int lengthR, debR, nbitsR;
2242 int lengthG, debG, nbitsG;
2243 int lengthB, debB, nbitsB;
2245 // Get info from Lut Descriptors
2246 // (the 3 LUT descriptors may be different)
2248 std::string LutDescriptionR = GetPubElValByNumber(0x0028,0x1101);
2249 if (LutDescriptionR == GDCM_UNFOUND)
2251 std::string LutDescriptionG = GetPubElValByNumber(0x0028,0x1102);
2252 if (LutDescriptionG == GDCM_UNFOUND)
2254 std::string LutDescriptionB = GetPubElValByNumber(0x0028,0x1103);
2255 if (LutDescriptionB == GDCM_UNFOUND)
2258 std::vector<std::string> tokens;
2260 tokens.erase(tokens.begin(),tokens.end()); // clean any previous value
2261 Tokenize (LutDescriptionR, tokens, "\\");
2262 lengthR=atoi(tokens[0].c_str()); // Red LUT length in Bytes
2263 debR =atoi(tokens[1].c_str()); // subscript of the first Lut Value
2264 nbitsR =atoi(tokens[2].c_str()); // Lut item size (in Bits)
2267 tokens.erase(tokens.begin(),tokens.end()); // clean any previous value
2268 Tokenize (LutDescriptionG, tokens, "\\");
2269 lengthG=atoi(tokens[0].c_str()); // Green LUT length in Bytes
2270 debG =atoi(tokens[1].c_str());
2271 nbitsG =atoi(tokens[2].c_str());
2274 tokens.erase(tokens.begin(),tokens.end()); // clean any previous value
2275 Tokenize (LutDescriptionB, tokens, "\\");
2276 lengthB=atoi(tokens[0].c_str()); // Blue LUT length in Bytes
2277 debB =atoi(tokens[1].c_str());
2278 nbitsB =atoi(tokens[2].c_str());
2281 // Load LUTs into memory, (as they were stored on disk)
2283 unsigned char *lutR =(unsigned char *)
2284 GetPubElValVoidAreaByNumber(0x0028,0x1201);
2285 unsigned char *lutG =(unsigned char *)
2286 GetPubElValVoidAreaByNumber(0x0028,0x1202);
2287 unsigned char *lutB =(unsigned char *)
2288 GetPubElValVoidAreaByNumber(0x0028,0x1203);
2290 if (!lutR || !lutG || !lutB ) {
2293 // forge the 4 * 8 Bits Red/Green/Blue/Alpha LUT
2295 unsigned char *LUTRGBA = (unsigned char *)calloc(1024,1); // 256 * 4 (R, G, B, Alpha)
2299 memset(LUTRGBA, 0, 1024);
2302 std::string str_nb = GetPubElValByNumber(0x0028,0x0100);
2303 if (str_nb == GDCM_UNFOUND ) {
2306 nb = atoi(str_nb.c_str() );
2310 if (nbitsR==16 && nb==8) // when LUT item size is different than pixel size
2311 mult=2; // high byte must be = low byte
2312 else // See PS 3.3-2003 C.11.1.1.2 p 619
2316 // if we get a black image, let's just remove the '+1'
2317 // from 'i*mult+1' and check again
2318 // if it works, we shall have to check the 3 Palettes
2319 // to see which byte is ==0 (first one, or second one)
2321 // We give up the checking to avoid some overhead
2326 for(i=0;i<lengthR;i++) {
2327 *a = lutR[i*mult+1];
2331 for(i=0;i<lengthG;i++) {
2332 *a = lutG[i*mult+1];
2336 for(i=0;i<lengthB;i++) {
2337 *a = lutB[i*mult+1];
2341 for(i=0;i<256;i++) {
2342 *a = 1; // Alpha component
2346 //How to free the now useless LUTs?
2348 //free(LutR); free(LutB); free(LutG);