1 /*=========================================================================
4 Module: $RCSfile: gdcmDocument.h,v $
6 Date: $Date: 2005/11/21 09:46:26 $
7 Version: $Revision: 1.132 $
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 ) );
56 bool SetShaDict(Dict *dict);
57 bool SetShaDict(DictKey const &dictName);
59 // Informations contained in the gdcm::Document
61 virtual bool IsReadable();
64 FileType GetFileType();
65 std::string GetTransferSyntax();
66 /// Return the Transfer Syntax as a string
67 std::string GetTransferSyntaxName();
70 /// 'Swap code' accessor (see \ref SwapCode )
71 int GetSwapCode() { return SwapCode; }
74 /// Accessor to \ref Filename
75 const std::string &GetFileName() const { return Filename; }
76 /// Accessor to \ref Filename
77 virtual void SetFileName(std::string const &fileName)
78 { if (Filename != fileName)
79 Filename = fileName, IsDocumentModified = true; }
81 std::ifstream *OpenFile();
83 void WriteContent( std::ofstream *fp, FileType type );
86 virtual void LoadEntryBinArea(uint16_t group, uint16_t elem);
87 virtual void LoadEntryBinArea(DataEntry *entry);
89 void LoadDocEntrySafe(DocEntry *entry);
90 void AddForceLoadElement(uint16_t group, uint16_t elem);
92 // Ordering of Documents
93 bool operator<(Document &document);
96 * \brief Sets the LoadMode as a boolean string.
97 * LD_NOSEQ, LD_NOSHADOW, LD_NOSHADOWSEQ
98 ... (nothing more, right now)
99 * WARNING : before using NO_SHADOW, be sure *all* your files
100 * contain accurate values in the 0x0000 element (if any)
101 * of *each* Shadow Group. The parser will fail if the size is wrong !
102 * @param mode Load mode to be used
104 void SetLoadMode (int mode) { if (LoadMode != mode)
105 LoadMode=mode, IsDocumentModified = true; }
109 // Constructor and destructor are protected to forbid end user
110 // to instanciate from this class Document (only gdcm::File and
111 // gdcm::DicomDir are meaningfull).
115 uint16_t ReadInt16() throw ( FormatError );
116 uint32_t ReadInt32() throw ( FormatError );
117 void SkipBytes(uint32_t);
118 int ComputeGroup0002Length( );
121 /// Refering underlying filename.
122 std::string Filename;
124 /// \brief Swap code gives an information on the byte order of a
125 /// supposed to be an int32, as it's read on disc
126 /// (depending on the image Transfer Syntax *and* on the processor endianess)
127 /// as opposed as it should in memory to be dealt as an int32.
129 /// - a 'Little Endian' image, read with a little endian processor
130 /// will have a SwapCode= 1234 (the order is OK; nothing to do)
131 /// - a 'Little Endian' image, read with a big endian procesor
132 /// will have a SwapCode= 4321 (the order is wrong; int32 an int16 must be
134 /// note : values 2143, 4321, 3412 remain for the ACR-NEMA time, and
135 /// the well known 'Bad Big Endian' and 'Bad Little Endian' codes
138 ///\brief whether we already parsed group 0002 (Meta Elements)
139 bool Group0002Parsed;
141 ///\brief whether file has a DCM Preamble
144 /// File Pointer, opened during Document parsing.
147 /// ACR, ACR_LIBIDO, ExplicitVR, ImplicitVR, Unknown
150 /// After opening the file, we read HEADER_LENGTH_TO_READ bytes.
151 static const unsigned int HEADER_LENGTH_TO_READ;
152 /// \brief Elements whose value is longer than MAX_SIZE_LOAD_ELEMENT_VALUE
154 static const unsigned int MAX_SIZE_LOAD_ELEMENT_VALUE;
156 /// User supplied list of elements to Anonymize
157 ListElements UserAnonymizeList;
159 /// User supplied list of elements to force Load
160 ListElements UserForceLoadList;
162 /// \brief Bit string integer (each one considered as a boolean)
163 /// Bit 0 : Skip Sequences, if possible
164 /// Bit 1 : Skip Shadow Groups if possible
165 /// Probabely, some more to add
168 /// \brief Whether the gdcm::Document is already parsed/loaded :
169 /// False from the creation of the gdcm::Document untill
170 /// gdcm::Document:Load()
171 bool IsDocumentAlreadyLoaded; // FIXME : probabely useless now
173 /// Whether the gdcm::Document was modified since the last Load()
174 bool IsDocumentModified;
179 bool DoTheLoadingDocumentJob();
181 // System access (meaning endian related !?)
182 uint16_t SwapShort(uint16_t);
183 uint32_t SwapLong(uint32_t);
184 double SwapDouble(double);
185 /// \brief Unswaps back the bytes of 2-bytes long integer
186 /// so they agree with the processor order.
187 uint16_t UnswapShort(uint16_t a) { return SwapShort(a);}
188 /// \brief Unswaps back the bytes of 4-byte long integer
189 /// so they agree with the processor order.
190 uint32_t UnswapLong(uint32_t a) { return SwapLong(a);}
193 void ParseDES(DocEntrySet *set, long offset, long l_max, bool delim_mode);
194 void ParseSQ (SeqEntry *seq, long offset, long l_max, bool delim_mode);
196 void LoadDocEntry (DocEntry *e, bool forceLoad = false);
197 void FindDocEntryLength (DocEntry *e) throw ( FormatError );
198 uint32_t FindDocEntryLengthOBOrOW() throw( FormatUnexpected );
199 VRKey FindDocEntryVR();
200 bool CheckDocEntryVR (const VRKey &k);
202 void SkipDocEntry (DocEntry *entry);
203 void SkipToNextDocEntry (DocEntry *entry);
205 void FixDocEntryFoundLength(DocEntry *entry, uint32_t l);
206 bool IsDocEntryAnInteger (DocEntry *entry);
209 void SwitchByteSwapCode();
210 void SetMaxSizeLoadEntry(long);
212 // DocEntry related utilities
213 DocEntry *ReadNextDocEntry();
215 void HandleBrokenEndian (uint16_t &group, uint16_t &elem);
216 void HandleOutOfGroup0002(uint16_t &group, uint16_t &elem);
217 DocEntry *Backtrack(DocEntry *docEntry);
220 /// Public dictionary used to parse this header
222 /// \brief Optional "shadow dictionary" (private elements) used to parse
226 /// \brief Size threshold above which an element value will NOT be loaded
227 /// in memory (to avoid loading the image/volume itself). By default,
228 /// this upper bound is fixed to 1024 bytes (which might look reasonable
229 /// when one considers the definition of the various VR contents).
230 uint32_t MaxSizeLoadEntry;
232 /// \brief to allow any inner method to know current tag Group number
233 uint16_t CurrentGroup;
234 /// \brief to allow any inner method to know current tag Element number
235 uint16_t CurrentElem;
237 // uint32_t GenerateFreeTagKeyInGroup(uint16_t group);
238 // void BuildFlatHashTableRecurse( TagDocEntryHT &builtHT,
239 // DocEntrySet *set );
243 } // end namespace gdcm
245 //-----------------------------------------------------------------------------