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/*=========================================================================
Program: GDCM (Grassroots DICOM). A DICOM library
Copyright (c) 2006-2011 Mathieu Malaterre
All rights reserved.
See Copyright.txt or http://gdcm.sourceforge.net/Copyright.html for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
#ifndef GDCMIMAGEEXTENTREADER_H
#define GDCMIMAGEEXTENTREADER_H
#include "gdcmImageReader.h"
#include "gdcmImage.h"
#include "gdcmRegion.h"
namespace gdcm
{
class ImageRegionReaderInternals;
/**
* \brief ImageRegionReader
* \details This class is able to read a region from a DICOM file containing an image. This implementation
* requires that the information stored in the DICOM header are consistent with what is in the
* encapsulated Pixel Data. This is technically not required by DICOM standard, which makes
* this implementation illegal with regards to the famous JPEG note:
* http://dicom.nema.org/medical/dicom/current/output/chtml/part05/sect_8.2.html#para_4bcb841e-c6bf-4e26-82a5-3fad3c942da0
* \see ImageReader
*/
class GDCM_EXPORT ImageRegionReader : public ImageReader
{
public:
ImageRegionReader();
~ImageRegionReader() override;
/// Set/Get Region to be read
void SetRegion(Region const & region);
Region const &GetRegion() const;
/// Explicit call which will compute the minimal buffer length that can hold the whole
/// uncompressed image as defined by Region `region`.
/// \return 0 upon error
size_t ComputeBufferLength() const;
/// Read meta information (not Pixel Data) from the DICOM file.
/// \return false upon error
bool ReadInformation();
/// Read into buffer:
/// For Python, the `buflen` param is deduced directly from the input
/// bytearray passed as parameter (function only takes one param).
/// \return false upon error
bool ReadIntoBuffer(char *inreadbuffer, size_t buflen);
protected:
/// To prevent user from calling super class Read() function
bool Read() override;
private:
BoxRegion ComputeBoundingBox();
bool ReadRAWIntoBuffer(char *buffer, size_t buflen);
bool ReadRLEIntoBuffer(char *buffer, size_t buflen);
bool ReadJPEG2000IntoBuffer(char *buffer, size_t buflen);
bool ReadJPEGIntoBuffer(char *buffer, size_t buflen);
bool ReadJPEGLSIntoBuffer(char *buffer, size_t buflen);
ImageRegionReaderInternals *Internals;
};
} // end namespace gdcm
#endif //GDCMIMAGEEXTENTREADER_H
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