skip.connection.bytes

Skips forward from the current position of the connection. R
cannot seek on a gzfile connection (the underlying <code>gzseek()</code> fails
with 'invalid or incomplete compressed data' and only warns instead of
failing loudly), so compressed connections are skipped by reading and
discarding the bytes instead.

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) 

skip.connection.bytes function

<dl><dt>con</dt>
<dd>a connection opened in binary read mode.</dd>
<dt>num_bytes</dt>
<dd>numeric, the number of bytes to skip, relative to the
current position of the connection.</dd>
<dt>gzipped</dt>
<dd>logical, whether the connection is a gzfile connection, as
reported by <code>is.gzip.file</code>.</dd>
<dt>filepath</dt>
<dd>character string, used in error messages only.</dd></dl>

Arguments

Skip over bytes of a connection, transparently handling gzip. — skip.connection.bytes

<dl>

<dt>con</dt>
<dd>a connection opened in binary read mode.</dd>


<dt>num_bytes</dt>
<dd>numeric, the number of bytes to skip, relative to the
current position of the connection.</dd>


<dt>gzipped</dt>
<dd>logical, whether the connection is a gzfile connection, as
reported by <code>is.gzip.file</code>.</dd>


<dt>filepath</dt>
<dd>character string, used in error messages only.</dd>

</dl>

skip.connection.bytes: Skip over bytes of a connection, transparently handling gzip.

Description

Usage

Value

Arguments