# gdcmReader.h

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    00001 /*=========================================================================
    00002
    00003   Program: GDCM (Grassroots DICOM). A DICOM library
    00004   Module:  $URL$
    00005
    00006   Copyright (c) 2006-2010 Mathieu Malaterre
    00007   All rights reserved.
    00008   See Copyright.txt or http://gdcm.sourceforge.net/Copyright.html for details.
    00009
    00010      This software is distributed WITHOUT ANY WARRANTY; without even
    00011      the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
    00012      PURPOSE.  See the above copyright notice for more information.
    00013
    00014 =========================================================================*/
    00015
    00016 #ifndef GDCMREADER_H
    00017 #define GDCMREADER_H
    00018
    00019 #include "gdcmFile.h"
    00020
    00021
    00022 #include <fstream>
    00023
    00024 namespace gdcm
    00025 {
    00026   class StreamImageReader;
    00056 class GDCM_EXPORT Reader
    00057 {
    00058 public:
    00059   Reader():F(new File){
    00060     Stream = NULL;
    00061     Ifstream = NULL;
    00062   }
    00063   virtual ~Reader();
    00064
    00066   virtual bool Read(); // Execute()
    00067
    00070   void SetFileName(const char *filename) {
    00071     if(Ifstream) delete Ifstream;
    00072     Ifstream = new std::ifstream();
    00073     Ifstream->open(filename, std::ios::binary);
    00074     Stream = Ifstream;
    00075   }
    00076
    00078   void SetStream(std::istream &input_stream) {
    00079     Stream = &input_stream;
    00080   }
    00081
    00083   const File &GetFile() const { return *F; }
    00084
    00086   File &GetFile() { return *F; }
    00087
    00089   void SetFile(File& file) { F = &file; }
    00090
    00092   bool ReadUpToTag(const Tag & tag, std::set<Tag> const & skiptags);
    00093
    00095   bool ReadSelectedTags(std::set<Tag> const & tags);
    00096
    00097 protected:
    00098   bool ReadPreamble();
    00099   bool ReadMetaInformation();
    00100   bool ReadDataSet();
    00101
    00102   SmartPointer<File> F;
    00103
    00104   friend class StreamImageReader; //need to be friended to be able to grab the GetStreamPtr
    00105
    00106   //this function is added for the StreamImageReader, which needs to read
    00107   //up to the pixel data and then stops right before reading the pixel data.
    00108   //it's used to get that position, so that reading can continue
    00109   //apace once the read function is called.
    00110   //so, this function gets the stream directly, and then allows for position information
    00111   //from the tellg function, and allows for stream/pointer manip in order
    00112   //to read the pixel data.  Note, of course, that reading pixel elements
    00113   //will still have to be subject to endianness swaps, if necessary.
    00114   std::istream* GetStreamPtr() const { return Stream; }
    00115
    00116 private:
    00117   template <typename T_Caller>
    00118   bool InternalReadCommon(const T_Caller &caller);
    00119   TransferSyntax GuessTransferSyntax();
    00120   std::istream *Stream;
    00121   std::ifstream *Ifstream;
    00122 };
    00123
    00130 } // end namespace gdcm
    00131
    00132
    00133 #endif //GDCMREADER_H