// Asynchronously returns a stream that represents the data section of the current header.
// If copyData is true, then a total number of _size bytes will be copied to a new MemoryStream, which is then returned.
// Otherwise, if the archive stream is seekable, returns a seekable wrapper stream.
// Otherwise, it returns an unseekable wrapper stream.
private static async ValueTask <Stream?> GetDataStreamAsync(Stream archiveStream, bool copyData, long size, CancellationToken cancellationToken)
{
cancellationToken.ThrowIfCancellationRequested();
if (size == 0)
{
return(null);
}
if (copyData)
{
MemoryStream copiedData = new MemoryStream();
await TarHelpers.CopyBytesAsync(archiveStream, copiedData, size, cancellationToken).ConfigureAwait(false);
return(copiedData);
}
return(archiveStream.CanSeek
? new SeekableSubReadStream(archiveStream, archiveStream.Position, size)
: new SubReadStream(archiveStream, 0, size));
}
