Proposals:Updating Nrrd library 2009

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Nrrd Library

This page describes the procedure for synchronizing the NrrdIO parts of Teem, with the one in Insight/Utilities/NrrdIO

Note that patches may have to be moved in both directions.


  • Nrrd started as one of the libraries in Teem <>
  • NrrdIO is a subset of Teem containing only the IO functionalities (basically, parts of the air, biff, and nrrd libraries).
  • The only part of Teem that's in ITK is in NrrdIO. Also, while Teem has a weakened LGPL license, NrrdIO is licensed identically to ITK.
  • Creating NrrdIO from Teem is done by a GNUMakefile and a perl script.
  • The back-propagation that should happen is from NrrdIO back to Teem, because the idea is that NrrdIO should be periodically regenerated from Teem.

Checking out Teem and NrrdIO

The way that Sourceforge names things makes this a little confusing. The sourceforge "project name" Teem includes multiple directories, or multiple separate SVN repositories. One directory, is called Teem, this is the main source tree, where all the NrrdIO sources come from. There is also a NrrdIO directory.

Use the following SVN command to check out all of Teem:

  svn co teem

and the following to checkout NrrdIO:

  svn co NrrdIO

The contents of the NrrdIO directory are created automatically from the Teem directory by

  • running a "pre-GNUmakefile" gnu makefile, which also uses a little perl script
    • The comments in pre-GNUmakefile explain this some.

NrrdIO / Teem Dashboard

Update Procedure

Perform the following two tasks:

From ITK to NrrdIO

For all the changes made to


after the last Nrrd batch commit (from G Kindlmann):

  • understand what the change was
  • apply the same change (or something equivalent) to the corresponding file in Teem
  • regenerate NrrdIO from Teem and update sourceforge's NrrdIO

For the .c files this should be easy; these are just copied directly from a Teem checkout, and then the headers are mangled a bit.

For NrrdIO.h; this is actually a concatenation of air/air.h, biff/biff.h, nrrd/nrrdDefines.h, nrrd/nrrdEnums.h, nrrd/nrrdMacros.h, and nrrd/nrrd.h (these are defined in the NEED_PUB_HDRS variable of NrrdIO/pre-GNUmakefile)

This is probably not a one-day project.

From Nrrd to ITK

Gradually or all at once, depending on our bravery, we copy sourceforge's NrrdIO to


and see what breaks,... and fix it



The table below lists all the files in NrrdIO which are generated from a Teem checkout via NrrdIO/pre-GNUmakefile; these are marked with "*", and the originating directory in Teem is also indicated (the air, biff, and nrrd directories inside teem/src). Changes in these files in ITK's NrrdIO since GLK's last commits in 2005 should be back-propagated to the corresponding files in Teem, so that when NrrdIO is next regenerated from Teem, none of the improvements to ITK's NrrdIO are lost. Handling updates to these files is the hard/interesting part of this project.

The files not marked with a "*" are not generated from Teem via NrrdIO/pre-GNUmakefile; they exist only within NrrdIO. GLK doesn't see why there would have been any changes to these in files in ITK's NrrdIO, because it wouldn't effect how ITK uses Nrrd, but if there are changes they should also be reviewed and possibly back-propagated to Teem's NrrdIO.

File Check ITK for Bug Fix Move from NrrdIO to ITK
* air/754.c
* nrrd/accessors.c
* air/array.c
* nrrd/arraysNrrd.c
* nrrd/axis.c
* biff/biffbiff.c
* biff/biffmsg.c
* nrrd/comment.c
* nrrd/defaultsNrrd.c
* air/dio.c
* nrrd/encodingAscii.c
* nrrd/encoding.c
* nrrd/encodingGzip.c
* nrrd/encodingHex.c
* nrrd/encodingRaw.c
* air/endianAir.c
* nrrd/endianNrrd.c
* air/enum.c
* nrrd/enumsNrrd.c
* nrrd/format.c
* nrrd/formatNRRD.c
* nrrd/gzio.c
* nrrd/keyvalue.c
* nrrd/methodsNrrd.c
* air/miscAir.c
* air/mop.c
* air,biff,nrrd/NrrdIO.h
* air/parseAir.c
* nrrd/parseNrrd.c
* air/privateAir.h
* nrrd/privateNrrd.h
* nrrd/read.c
* nrrd/reorder.c
* air/sane.c
* nrrd/simple.c
* air/string.c
* nrrd/subset.c
* include/teem32bit.h
* include/teemDio.h
* include/teemEndian.h
* include/teemPng.h
* include/teemQnanhibit.h
* nrrd/write.c