data_decoder: Array Data Decoder
In gifti: Reads in 'Neuroimaging' 'GIFTI' Files with Geometry Information

Description Usage Arguments Value Examples

Decodes values from a GIFTI image

data_decoder(
  values,
  encoding = c("ASCII", "Base64Binary", "GZipBase64Binary", "ExternalFileBinary"),
  datatype = NULL,
  endian = c("little", "big", "LittleEndian", "BigEndian"),
  ext_filename = NULL,
  n = NULL
)

`values`	text from XML of GIFTI image
`encoding`	encoding of GIFTI values
`datatype`	Passed to `convert_binary_datatype`
`endian`	Endian to pass in `readBin`
`ext_filename`	if `encoding = "ExternalFileBinary"`, then this is the external filename
`n`	number of values to read. Relevant if `encoding = "ExternalFileBinary"`

Vector of values

if (have_gifti_test_data(outdir = NULL)) {
   gii_files = download_gifti_data(outdir = NULL)
   L = gifti_list(gii_files[1])
   orig = L$DataArray$Data[[1]]
   encoding = attributes(L$DataArray)$Encoding
   datatype = attributes(L$DataArray)$DataType
   endian = attributes(L$DataArray)$Endian
   vals =  data_decoder(orig, encoding = encoding,
   datatype = datatype, endian = endian)
   enc = data_encoder(vals, encoding = encoding,
   datatype = datatype, endian = endian)
   enc == orig
}