1 /*=========================================================================
4 Module: $RCSfile: gdcmDocument.h,v $
6 Date: $Date: 2005/06/29 15:58:33 $
7 Version: $Revision: 1.113 $
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"
31 #define NO_SEQ 0x00000001 // Don't load odd groups
32 #define NO_SHADOW 0x00000002 // Don't load Sequences
33 #define NO_SHADOWSEQ 0x00000004 // Don't load Sequences if they belong to odd group
34 // (*exclusive* from NO_SEQ and NO_SHADOW)
42 //-----------------------------------------------------------------------------
44 * \brief Derived by both gdcm::File and gdcm::DicomDir
46 class GDCM_EXPORT Document : public ElementSet
50 typedef std::list<Element> ListElements;
53 virtual bool Load( std::string const &filename );
58 bool SetShaDict(Dict *dict);
59 bool SetShaDict(DictKey const &dictName);
61 // 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; }
73 // System access (meaning endian related !?)
74 uint16_t SwapShort(uint16_t);
75 uint32_t SwapLong(uint32_t);
76 /// \brief Unswaps back the bytes of 2-bytes long integer
77 /// so they agree with the processor order.
78 uint16_t UnswapShort(uint16_t a) { return SwapShort(a);}
79 /// \brief Unswaps back the bytes of 4-byte long integer
80 /// so they agree with the processor order.
81 uint32_t UnswapLong(uint32_t a) { return SwapLong(a);}
84 /// Accessor to \ref Filename
85 const std::string &GetFileName() const { return Filename; }
86 /// Accessor to \ref Filename
87 void SetFileName(std::string const &fileName) { Filename = fileName; }
89 std::ifstream *OpenFile();
91 void WriteContent( std::ofstream *fp, FileType type );
94 virtual void LoadEntryBinArea(uint16_t group, uint16_t elem);
95 virtual void LoadEntryBinArea(BinEntry *entry);
97 void LoadDocEntrySafe(DocEntry *entry);
99 // Ordering of Documents
100 bool operator<(Document &document);
103 * \brief Sets the LoadMode as a boolean string.
104 * NO_SEQ, NO_SHADOW, NO_SHADOWSEQ
105 ... (nothing more, right now)
106 * WARNING : before using NO_SHADOW, be sure *all* your files
107 * contain accurate values in the 0x0000 element (if any)
108 * of *each* Shadow Group. The parser will fail if the size is wrong !
109 * @param mode Load mode to be used
111 void SetLoadMode (int mode) { LoadMode = mode; }
115 // Constructor and destructor are protected to forbid end user
116 // to instanciate from this class Document (only gdcm::File and
117 // gdcm::DicomDir are meaningfull).
119 Document( std::string const &filename );
122 uint16_t ReadInt16() throw ( FormatError );
123 uint32_t ReadInt32() throw ( FormatError );
124 void SkipBytes(uint32_t);
125 int ComputeGroup0002Length( FileType filetype );
128 /// Refering underlying filename.
129 std::string Filename;
131 /// \brief Swap code gives an information on the byte order of a
132 /// supposed to be an int32, as it's read on disc
133 /// (depending on the image Transfer Syntax *and* on the processor endianess)
134 /// as opposed as it should in memory to be dealt as an int32.
136 /// - a 'Little Endian' image, read with a little endian processor
137 /// will have a SwapCode= 1234 (the order is OK; nothing to do)
138 /// - a 'Little Endian' image, read with a big endian procesor
139 /// will have a SwapCode= 4321 (the order is wrong; int32 an int16 must be
141 /// note : values 2143, 4321, 3412 remain for the ACR-NEMA time, and
142 /// the well known 'Bad Big Endian' and 'Bad Little Endian' codes
145 ///\brief whether we already parsed group 0002 (Meta Elements)
146 bool Group0002Parsed;
148 ///\brief whether file has a DCM Preamble
151 /// File Pointer, opened during Document parsing.
154 /// ACR, ACR_LIBIDO, ExplicitVR, ImplicitVR, Unknown
157 /// After opening the file, we read HEADER_LENGTH_TO_READ bytes.
158 static const unsigned int HEADER_LENGTH_TO_READ;
159 /// \brief Elements whose value is longer than MAX_SIZE_LOAD_ELEMENT_VALUE
161 static const unsigned int MAX_SIZE_LOAD_ELEMENT_VALUE;
163 /// List of elements to Anonymize
164 ListElements AnonymizeList;
166 /// \brief Bit string integer (each one considered as a boolean)
167 /// Bit 0 : Skip Sequences, if possible
168 /// Bit 1 : Skip Shadow Groups if possible
169 /// Probabely, some more to add
172 /// Whether the gdcm::Document is already parsed/loaded
173 /// - False from the creation of the gdcm::Document untill
174 /// gdcm::Document:Load()
175 bool IsDocumentAlreadyLoaded;
182 void ParseDES(DocEntrySet *set, long offset, long l_max, bool delim_mode);
183 void ParseSQ (SeqEntry *seq, long offset, long l_max, bool delim_mode);
185 void LoadDocEntry (DocEntry *e);
186 void FindDocEntryLength (DocEntry *e) throw ( FormatError );
187 uint32_t FindDocEntryLengthOBOrOW() throw( FormatUnexpected );
188 std::string FindDocEntryVR();
189 bool CheckDocEntryVR (VRKey k);
191 std::string GetDocEntryValue (DocEntry *entry);
192 std::string GetDocEntryUnvalue(DocEntry *entry);
194 void SkipDocEntry (DocEntry *entry);
195 void SkipToNextDocEntry (DocEntry *entry);
197 void FixDocEntryFoundLength(DocEntry *entry, uint32_t l);
198 bool IsDocEntryAnInteger (DocEntry *entry);
201 void SwitchByteSwapCode();
202 void SetMaxSizeLoadEntry(long);
204 // DocEntry related utilities
205 DocEntry *ReadNextDocEntry();
207 void HandleBrokenEndian (uint16_t &group, uint16_t &elem);
208 void HandleOutOfGroup0002(uint16_t &group, uint16_t &elem);
211 /// Public dictionary used to parse this header
213 /// \brief Optional "shadow dictionary" (private elements) used to parse
217 /// \brief Size threshold above which an element value will NOT be loaded
218 /// in memory (to avoid loading the image/volume itself). By default,
219 /// this upper bound is fixed to 1024 bytes (which might look reasonable
220 /// when one considers the definition of the various VR contents).
221 uint32_t MaxSizeLoadEntry;
223 // uint32_t GenerateFreeTagKeyInGroup(uint16_t group);
224 // void BuildFlatHashTableRecurse( TagDocEntryHT &builtHT,
225 // DocEntrySet *set );
229 } // end namespace gdcm
231 //-----------------------------------------------------------------------------