[NeXus-code-tickets] [NeXusCode] #226: Save a NeXus file with chunking and no compression

[NeXus Data Format Library and Applications]

#226: Save a NeXus file with chunking and no compression
---------------------------+------------------------------------------------
 Reporter:  Pedro.vicente  |       Owner:  Pedro.vicente
     Type:  enhancement    |      Status:  new          
 Priority:  major          |   Milestone:  4.3.0        
Component:  napi           |     Version:  4.2.0        
 Keywords:                 |  
---------------------------+------------------------------------------------
 PROPOSED SOLUTION (HDF5)

 1) define a new symbol  NX_CHUNK


 {{{

 /* Map NeXus compression methods to HDF compression methods */
 #define NX_CHUNK     0
 #define NX_COMP_NONE 100
 #define NX_COMP_LZW 200
 #define NX_COMP_RLE 300
 #define NX_COMP_HUF 400
 }}}


 2) the same for the C++ binding


 {{{
 enum NXcompression {
     CHUNK = NX_CHUNK,
     NONE = NX_COMP_NONE,
     LZW = NX_COMP_LZW,
     RLE = NX_COMP_RLE,
     HUF = NX_COMP_HUF
   };
 }}}




 3) modify NX5compmakedata  to handle this case

 {{{
 else if (compress_type == NX_CHUNK)
       {
           cparms = H5Pcreate(H5P_DATASET_CREATE);
           iNew = H5Pset_chunk(cparms,rank,chunkdims);
           if (iNew < 0)
           {
               NXIReportError (NXpData, "ERROR: Size of chunks could not be
 set!");
               return NX_ERROR;
           }
           iRet = H5Dcreate (pFile->iCurrentG, (char*)name, datatype1,
 dataspace, cparms);

       }


 }}}

-- 
Ticket URL: <http://trac.nexusformat.org/code/ticket/226>
NeXus Data Format Library and Applications <http://www.nexusformat.org/>
NeXus Data Format Library and Applications