1 /*=========================================================================
4 Module: $RCSfile: gdcmDocument.h,v $
6 Date: $Date: 2005/11/21 16:28:06 $
7 Version: $Revision: 1.136 $
9 Copyright (c) CREATIS (Centre de Recherche et d'Applications en Traitement de
10 l'Image). All rights reserved. See Doc/License.txt or
11 http://www.creatis.insa-lyon.fr/Public/Gdcm/License.html for details.
13 This software is distributed WITHOUT ANY WARRANTY; without even
14 the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
15 PURPOSE. See the above copyright notices for more information.
17 =========================================================================*/
19 #ifndef GDCMDOCUMENT_H
20 #define GDCMDOCUMENT_H
24 #include "gdcmElementSet.h"
25 #include "gdcmException.h"
26 #include "gdcmDebug.h" // for LEGACY
37 //-----------------------------------------------------------------------------
39 * \brief Derived by both gdcm::File and gdcm::DicomDir
41 class GDCM_EXPORT Document : public ElementSet
43 gdcmTypeMacro(Document);
46 typedef std::list<DicomElement> ListElements;
49 //Deprecated : use SetFileName() + Load()
50 //GDCM_LEGACY( virtual bool Load( std::string const &filename ) );
51 //virtual bool Load( std::string const &filename );
57 bool SetShaDict(Dict *dict);
58 bool SetShaDict(DictKey const &dictName);
60 // Informations contained in the gdcm::Document
62 virtual bool IsReadable();
65 FileType GetFileType();
66 std::string GetTransferSyntax();
67 /// Return the Transfer Syntax as a string
68 std::string GetTransferSyntaxName();
71 /// 'Swap code' accessor (see \ref SwapCode )
72 int GetSwapCode() { return SwapCode; }
75 /// Accessor to \ref Filename
76 const std::string &GetFileName() const { return Filename; }
77 /// Accessor to \ref Filename
78 virtual void SetFileName(std::string const &fileName)
79 { if (Filename != fileName)
80 Filename = fileName, IsDocumentModified = true; }
82 std::ifstream *OpenFile();
84 void WriteContent( std::ofstream *fp, FileType type );
87 virtual void LoadEntryBinArea(uint16_t group, uint16_t elem);
88 virtual void LoadEntryBinArea(DataEntry *entry);
90 void LoadDocEntrySafe(DocEntry *entry);
91 void AddForceLoadElement(uint16_t group, uint16_t elem);
93 // Ordering of Documents
94 bool operator<(Document &document);
97 * \brief Sets the LoadMode as a boolean string.
98 * LD_NOSEQ, LD_NOSHADOW, LD_NOSHADOWSEQ
99 ... (nothing more, right now)
100 * WARNING : before using NO_SHADOW, be sure *all* your files
101 * contain accurate values in the 0x0000 element (if any)
102 * of *each* Shadow Group. The parser will fail if the size is wrong !
103 * @param mode Load mode to be used
105 void SetLoadMode (int mode) { if (LoadMode != mode)
106 LoadMode=mode, IsDocumentModified = true; }
110 // Constructor and destructor are protected to forbid end user
111 // to instanciate from this class Document (only gdcm::File and
112 // gdcm::DicomDir are meaningfull).
116 uint16_t ReadInt16() throw ( FormatError );
117 uint32_t ReadInt32() throw ( FormatError );
118 void SkipBytes(uint32_t);
119 int ComputeGroup0002Length( );
122 /// Refering underlying filename.
123 std::string Filename;
125 /// \brief Swap code gives an information on the byte order of a
126 /// supposed to be an int32, as it's read on disc
127 /// (depending on the image Transfer Syntax *and* on the processor endianess)
128 /// as opposed as it should in memory to be dealt as an int32.
130 /// - a 'Little Endian' image, read with a little endian processor
131 /// will have a SwapCode= 1234 (the order is OK; nothing to do)
132 /// - a 'Little Endian' image, read with a big endian procesor
133 /// will have a SwapCode= 4321 (the order is wrong; int32 an int16 must be
135 /// note : values 2143, 4321, 3412 remain for the ACR-NEMA time, and
136 /// the well known 'Bad Big Endian' and 'Bad Little Endian' codes
139 ///\brief whether we already parsed group 0002 (Meta Elements)
140 bool Group0002Parsed;
142 ///\brief whether file has a DCM Preamble
145 /// File Pointer, opened during Document parsing.
148 /// ACR, ACR_LIBIDO, ExplicitVR, ImplicitVR, Unknown
151 /// After opening the file, we read HEADER_LENGTH_TO_READ bytes.
152 static const unsigned int HEADER_LENGTH_TO_READ;
153 /// \brief Elements whose value is longer than MAX_SIZE_LOAD_ELEMENT_VALUE
155 static const unsigned int MAX_SIZE_LOAD_ELEMENT_VALUE;
157 /// User supplied list of elements to Anonymize
158 ListElements UserAnonymizeList;
160 /// User supplied list of elements to force Load
161 ListElements UserForceLoadList;
163 /// \brief Bit string integer (each one considered as a boolean)
164 /// Bit 0 : Skip Sequences, if possible
165 /// Bit 1 : Skip Shadow Groups if possible
166 /// Probabely, some more to add
169 /// \brief Whether the gdcm::Document is already parsed/loaded :
170 /// False from the creation of the gdcm::Document untill
171 /// gdcm::Document:Load()
172 bool IsDocumentAlreadyLoaded; // FIXME : probabely useless now
174 /// Whether the gdcm::Document was modified since the last Load()
175 bool IsDocumentModified;
180 bool DoTheLoadingDocumentJob();
182 // System access (meaning endian related !?)
183 uint16_t SwapShort(uint16_t);
184 uint32_t SwapLong(uint32_t);
185 double SwapDouble(double);
186 /// \brief Unswaps back the bytes of 2-bytes long integer
187 /// so they agree with the processor order.
188 uint16_t UnswapShort(uint16_t a) { return SwapShort(a);}
189 /// \brief Unswaps back the bytes of 4-byte long integer
190 /// so they agree with the processor order.
191 uint32_t UnswapLong(uint32_t a) { return SwapLong(a);}
194 void ParseDES(DocEntrySet *set, long offset, long l_max, bool delim_mode);
195 void ParseSQ (SeqEntry *seq, long offset, long l_max, bool delim_mode);
197 void LoadDocEntry (DocEntry *e, bool forceLoad = false);
198 void FindDocEntryLength (DocEntry *e) throw ( FormatError );
199 uint32_t FindDocEntryLengthOBOrOW() throw( FormatUnexpected );
200 VRKey FindDocEntryVR();
201 bool CheckDocEntryVR (const VRKey &k);
203 void SkipDocEntry (DocEntry *entry);
204 void SkipToNextDocEntry (DocEntry *entry);
206 void FixDocEntryFoundLength(DocEntry *entry, uint32_t l);
207 bool IsDocEntryAnInteger (DocEntry *entry);
210 void SwitchByteSwapCode();
211 void SetMaxSizeLoadEntry(long);
213 // DocEntry related utilities
214 DocEntry *ReadNextDocEntry();
216 void HandleBrokenEndian (uint16_t &group, uint16_t &elem);
217 void HandleOutOfGroup0002(uint16_t &group, uint16_t &elem);
218 DocEntry *Backtrack(DocEntry *docEntry);
221 /// Public dictionary used to parse this header
223 /// \brief Optional "shadow dictionary" (private elements) used to parse
227 /// \brief Size threshold above which an element value will NOT be loaded
228 /// in memory (to avoid loading the image/volume itself). By default,
229 /// this upper bound is fixed to 1024 bytes (which might look reasonable
230 /// when one considers the definition of the various VR contents).
231 uint32_t MaxSizeLoadEntry;
233 /// \brief to allow any inner method to know current tag Group number
234 uint16_t CurrentGroup;
235 /// \brief to allow any inner method to know current tag Element number
236 uint16_t CurrentElem;
238 // uint32_t GenerateFreeTagKeyInGroup(uint16_t group);
239 // void BuildFlatHashTableRecurse( TagDocEntryHT &builtHT,
240 // DocEntrySet *set );
244 } // end namespace gdcm
246 //-----------------------------------------------------------------------------