is.gzip.file

Uses the gzip magic number (0x1f 0x8b) rather than the file
extension, since files are regularly renamed or stripped of their
extension. Reading a gzip-compressed payload from a plain <code><a href="/link/file()?package=freesurferformats&version=1.1.0" data-mini-rdoc="freesurferformats::file()">file()</a></code>
connection silently produces garbage.

internal

Provides functions to read and write neuroimaging data in various file formats, with a focus on 'FreeSurfer' formats. This includes, but is not limited to, the following file formats: 1) MGH/MGZ/NIFTI format files, which can contain multi-dimensional images or other data. Typically they contain time-series of three-dimensional brain scans acquired by magnetic resonance imaging (MRI). They can also contain vertex-wise measures of surface morphometry data. The MGH format is named after the Massachusetts General Hospital, and the MGZ format is a compressed version of the same format. 2) 'FreeSurfer' morphometry data files in binary 'curv' format. These contain vertex-wise surface measures, i.e., one scalar value for each vertex of a brain surface mesh. These are typically values like the cortical thickness or brain surface area at each vertex. 3) Annotation file format. This contains a brain surface parcellation derived from a cortical atlas. 4) Surface file format. Contains a brain surface mesh, given by a list of vertices and a list of faces.

Tim Schc3<a4>fer

freesurferformats

Read and Write 'FreeSurfer' Neuroimaging File Formats

Tim Schäfer

Van Essen Lab 

Montreal Neurological Institute (MNI) 

is.gzip.file function

<dl><dt>filepath</dt>
<dd>character string, path to the file to check.</dd></dl>

Arguments

Uses the gzip magic number (0x1f 0x8b) rather than the file
extension, since files are regularly renamed or stripped of their
extension. Reading a gzip-compressed payload from a plain <code><a href='https://rdrr.io/r/base/connections.html'>file()</a></code>
connection silently produces garbage.

Check whether a file is gzip-compressed, based on its magic bytes. — is.gzip.file

<dl>

<dt>filepath</dt>
<dd>character string, path to the file to check.</dd>

</dl>

is.gzip.file: Check whether a file is gzip-compressed, based on its magic bytes.

Description

Usage

Value

Arguments