I have received the following error for my package oro.nifti under "CRAN
checks" for r-devel-linux-ix86; i.e.,


http://www.r-project.org/nosvn/R.check/r-devel-linux-ix86/oro.nifti-00check.html

   - using R version 2.12.0 Under development (unstable) (2010-06-12 r52259)

   - using platform: i686-pc-linux-gnu (32-bit)
   - using session charset: UTF-8
   - checking for file ‘oro.nifti/DESCRIPTION’ ... OK
   - this is package ‘oro.nifti’ version ‘0.1.4’
   - checking package name space information ... OK
   - checking package dependencies ... OK
   - checking if this is a source package ... OK
   - checking for executable files ... OK
   - checking whether package ‘oro.nifti’ can be installed ... OK
   - checking package directory ... OK
   - checking for portable file names ... OK
   - checking for sufficient/correct file permissions ... OK
   - checking DESCRIPTION meta-information ... OK
   - checking top-level files ... OK
   - checking index information ... OK
   - checking package subdirectories ... OK
   - checking R files for non-ASCII characters ... OK
   - checking R files for syntax errors ... OK
   - checking whether the package can be loaded ... OK
   - checking whether the package can be loaded with stated dependencies ...
   OK
   - checking whether the package can be unloaded cleanly ... OK
   - checking whether the name space can be loaded with stated dependencies
   ... OK
   - checking whether the name space can be unloaded cleanly ... OK
   - checking for unstated dependencies in R code ... OK
   - checking S3 generic/method consistency ... OK
   - checking replacement functions ... OK
   - checking foreign function calls ... OK
   - checking R code for possible problems ... OK
   - checking Rd files ... OK
   - checking Rd metadata ... OK
   - checking Rd cross-references ... OK
   - checking for missing documentation entries ... OK
   - checking for code/documentation mismatches ... OK
   - checking Rd \usage sections ... OK
   - checking Rd contents ... OK
   - checking examples ... ERROR
   Running examples in ‘oro.nifti-Ex.R’ failed
   The error most likely occurred in:

   > ### Name: writeNIfTI
   > ### Title: writeNIfTI
   > ### Aliases: writeNIfTI
   > ### Keywords: file
   >
   > ### ** Examples
   >
   > norm <- dnorm(seq(-5, 5, length=32), sd=2)
   > norm <- (norm-min(norm)) / max(norm-min(norm))
   > img <- outer(outer(norm, norm), norm)
   > img <- round(255 * img)
   > img[17:32,,] <- 255 - img[17:32,,]
   > img.nifti <- nifti(img) # create NIfTI object
   >
   > writeNIfTI(img.nifti, "test-nifti-image-uint8", verbose=TRUE)
   niftiExtension detected!
   niftiAuditTrail detected!
   vox_offset = 1392
   *writing niftiExtension(s) at byte = 6.803919e+17 # <- LARGE NUMBER!
   writing data at byte = 6.803919e+17 # <- LARGE NUMBER!*
   > ## These files should be viewable in, for example, FSLview
   > ## Make sure you adjust the min/max values for proper visualization
   > data <- readNIfTI("test-nifti-image-uint8", verbose=TRUE)
   fname = test-nifti-image-uint8
   files = test-nifti-image-uint8.nii.gz
   nii = test-nifti-image-uint8.nii.gz
   vox_offset = 1392
   niftiExtension detected!
   Error in read.nifti.content(fname, gzipped = TRUE, verbose = verbose, :
   -- extension size (esize) has overshot voxel offset --
   Calls: readNIfTI -> read.nifti.content
   Execution halted

Please draw your attention to the two lines annotated above.  The line of
code that "looks a bit odd" above is

       cat("  writing niftiExtension(s) at byte =", seek(fid), fill=TRUE)

...where fid is a call to file()... and this large number is causing the
subsequent read function to fail.

My questions are:

   - Why would this error occur in 32-bit linux only for R 2.12.0?
   - How can I test any fixes to this error given I am not running R in
   32-bit linux?

Any suggestions would be welcome.

Thank-you,

Brandon

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