1 /*=========================================================================
4 Module: $RCSfile: gdcmDocument.h,v $
6 Date: $Date: 2005/11/15 10:30:46 $
7 Version: $Revision: 1.131 $
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"
36 //-----------------------------------------------------------------------------
38 * \brief Derived by both gdcm::File and gdcm::DicomDir
40 class GDCM_EXPORT Document : public ElementSet
42 gdcmTypeMacro(Document);
45 typedef std::list<DicomElement> ListElements;
48 //Deprecated : use SetFileName() + Load()
49 virtual bool Load( std::string const &filename );
55 bool SetShaDict(Dict *dict);
56 bool SetShaDict(DictKey const &dictName);
58 // Informations contained in the gdcm::Document
60 virtual bool IsReadable();
63 FileType GetFileType();
64 std::string GetTransferSyntax();
65 /// Return the Transfer Syntax as a string
66 std::string GetTransferSyntaxName();
69 /// 'Swap code' accessor (see \ref SwapCode )
70 int GetSwapCode() { return SwapCode; }
73 /// Accessor to \ref Filename
74 const std::string &GetFileName() const { return Filename; }
75 /// Accessor to \ref Filename
76 virtual void SetFileName(std::string const &fileName)
77 { if (Filename != fileName)
78 Filename = fileName, IsDocumentModified = true; }
80 std::ifstream *OpenFile();
82 void WriteContent( std::ofstream *fp, FileType type );
85 virtual void LoadEntryBinArea(uint16_t group, uint16_t elem);
86 virtual void LoadEntryBinArea(DataEntry *entry);
88 void LoadDocEntrySafe(DocEntry *entry);
89 void AddForceLoadElement(uint16_t group, uint16_t elem);
91 // Ordering of Documents
92 bool operator<(Document &document);
95 * \brief Sets the LoadMode as a boolean string.
96 * LD_NOSEQ, LD_NOSHADOW, LD_NOSHADOWSEQ
97 ... (nothing more, right now)
98 * WARNING : before using NO_SHADOW, be sure *all* your files
99 * contain accurate values in the 0x0000 element (if any)
100 * of *each* Shadow Group. The parser will fail if the size is wrong !
101 * @param mode Load mode to be used
103 void SetLoadMode (int mode) { if (LoadMode != mode)
104 LoadMode=mode, IsDocumentModified = true; }
108 // Constructor and destructor are protected to forbid end user
109 // to instanciate from this class Document (only gdcm::File and
110 // gdcm::DicomDir are meaningfull).
114 uint16_t ReadInt16() throw ( FormatError );
115 uint32_t ReadInt32() throw ( FormatError );
116 void SkipBytes(uint32_t);
117 int ComputeGroup0002Length( );
120 /// Refering underlying filename.
121 std::string Filename;
123 /// \brief Swap code gives an information on the byte order of a
124 /// supposed to be an int32, as it's read on disc
125 /// (depending on the image Transfer Syntax *and* on the processor endianess)
126 /// as opposed as it should in memory to be dealt as an int32.
128 /// - a 'Little Endian' image, read with a little endian processor
129 /// will have a SwapCode= 1234 (the order is OK; nothing to do)
130 /// - a 'Little Endian' image, read with a big endian procesor
131 /// will have a SwapCode= 4321 (the order is wrong; int32 an int16 must be
133 /// note : values 2143, 4321, 3412 remain for the ACR-NEMA time, and
134 /// the well known 'Bad Big Endian' and 'Bad Little Endian' codes
137 ///\brief whether we already parsed group 0002 (Meta Elements)
138 bool Group0002Parsed;
140 ///\brief whether file has a DCM Preamble
143 /// File Pointer, opened during Document parsing.
146 /// ACR, ACR_LIBIDO, ExplicitVR, ImplicitVR, Unknown
149 /// After opening the file, we read HEADER_LENGTH_TO_READ bytes.
150 static const unsigned int HEADER_LENGTH_TO_READ;
151 /// \brief Elements whose value is longer than MAX_SIZE_LOAD_ELEMENT_VALUE
153 static const unsigned int MAX_SIZE_LOAD_ELEMENT_VALUE;
155 /// User supplied list of elements to Anonymize
156 ListElements UserAnonymizeList;
158 /// User supplied list of elements to force Load
159 ListElements UserForceLoadList;
161 /// \brief Bit string integer (each one considered as a boolean)
162 /// Bit 0 : Skip Sequences, if possible
163 /// Bit 1 : Skip Shadow Groups if possible
164 /// Probabely, some more to add
167 /// \brief Whether the gdcm::Document is already parsed/loaded :
168 /// False from the creation of the gdcm::Document untill
169 /// gdcm::Document:Load()
170 bool IsDocumentAlreadyLoaded; // FIXME : probabely useless now
172 /// Whether the gdcm::Document was modified since the last Load()
173 bool IsDocumentModified;
178 bool DoTheLoadingDocumentJob();
180 // System access (meaning endian related !?)
181 uint16_t SwapShort(uint16_t);
182 uint32_t SwapLong(uint32_t);
183 double SwapDouble(double);
184 /// \brief Unswaps back the bytes of 2-bytes long integer
185 /// so they agree with the processor order.
186 uint16_t UnswapShort(uint16_t a) { return SwapShort(a);}
187 /// \brief Unswaps back the bytes of 4-byte long integer
188 /// so they agree with the processor order.
189 uint32_t UnswapLong(uint32_t a) { return SwapLong(a);}
192 void ParseDES(DocEntrySet *set, long offset, long l_max, bool delim_mode);
193 void ParseSQ (SeqEntry *seq, long offset, long l_max, bool delim_mode);
195 void LoadDocEntry (DocEntry *e, bool forceLoad = false);
196 void FindDocEntryLength (DocEntry *e) throw ( FormatError );
197 uint32_t FindDocEntryLengthOBOrOW() throw( FormatUnexpected );
198 VRKey FindDocEntryVR();
199 bool CheckDocEntryVR (const VRKey &k);
201 void SkipDocEntry (DocEntry *entry);
202 void SkipToNextDocEntry (DocEntry *entry);
204 void FixDocEntryFoundLength(DocEntry *entry, uint32_t l);
205 bool IsDocEntryAnInteger (DocEntry *entry);
208 void SwitchByteSwapCode();
209 void SetMaxSizeLoadEntry(long);
211 // DocEntry related utilities
212 DocEntry *ReadNextDocEntry();
214 void HandleBrokenEndian (uint16_t &group, uint16_t &elem);
215 void HandleOutOfGroup0002(uint16_t &group, uint16_t &elem);
216 DocEntry *Backtrack(DocEntry *docEntry);
219 /// Public dictionary used to parse this header
221 /// \brief Optional "shadow dictionary" (private elements) used to parse
225 /// \brief Size threshold above which an element value will NOT be loaded
226 /// in memory (to avoid loading the image/volume itself). By default,
227 /// this upper bound is fixed to 1024 bytes (which might look reasonable
228 /// when one considers the definition of the various VR contents).
229 uint32_t MaxSizeLoadEntry;
231 /// \brief to allow any inner method to know current tag Group number
232 uint16_t CurrentGroup;
233 /// \brief to allow any inner method to know current tag Element number
234 uint16_t CurrentElem;
236 // uint32_t GenerateFreeTagKeyInGroup(uint16_t group);
237 // void BuildFlatHashTableRecurse( TagDocEntryHT &builtHT,
238 // DocEntrySet *set );
242 } // end namespace gdcm
244 //-----------------------------------------------------------------------------