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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 GDCMRLECODEC_H
#define GDCMRLECODEC_H
#include "gdcmImageCodec.h"
namespace gdcm
{
class Fragment;
class RLEInternals;
/**
* \brief Class to do RLE
* \note
* ANSI X3.9
* A.4.2 RLE Compression
* Annex G defines a RLE Compression Transfer Syntax. This transfer Syntax is
* identified by the UID value "1.2.840.10008.1.2.5". If the object allows
* multi-frame images in the pixel data field, then each frame shall be encoded
* separately. Each frame shall be encoded in one and only one Fragment (see PS
* 3.5.8.2).
*
*/
class GDCM_EXPORT RLECodec : public ImageCodec
{
friend class ImageRegionReader;
public:
RLECodec();
~RLECodec();
bool CanCode(TransferSyntax const &ts) const;
bool CanDecode(TransferSyntax const &ts) const;
bool Decode(DataElement const &is, DataElement &os);
unsigned long GetBufferLength() const { return BufferLength; }
void SetBufferLength(unsigned long l) { BufferLength = l; }
bool Code(DataElement const &in, DataElement &out);
bool GetHeaderInfo(std::istream &is, TransferSyntax &ts);
virtual ImageCodec * Clone() const;
protected:
bool DecodeExtent(
char *buffer,
unsigned int XMin, unsigned int XMax,
unsigned int YMin, unsigned int YMax,
unsigned int ZMin, unsigned int ZMax,
std::istream & is
);
bool DecodeByStreams(std::istream &is, std::ostream &os);
public:
void SetLength(unsigned long l)
{
Length = l;
}
protected:
bool StartEncode( std::ostream & );
bool IsRowEncoder();
bool IsFrameEncoder();
bool AppendRowEncode( std::ostream & out, const char * data, size_t datalen );
bool AppendFrameEncode( std::ostream & out, const char * data, size_t datalen );
bool StopEncode( std::ostream & );
private:
bool DecodeByStreamsCommon(std::istream &is, std::ostream &os);
RLEInternals *Internals;
unsigned long Length;
unsigned long BufferLength;
size_t DecodeFragment(Fragment const & frag, char *buffer, unsigned long llen);
};
} // end namespace gdcm
#endif //GDCMRLECODEC_H
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