Cleaned up minor issues

src/sample.rs

@@ -62,6 +62,7 @@ impl<'a, R: Read> Iterator for SampleIter<'a, R> {
         let last_byte = (output.as_ref() as &[u8])[output.len() - 1];
         if last_byte != b'\n' && last_byte != b'\r' {
             // non CR/LF-ended line
+            // line was cut off before ending, so we ignore it!
             self.is_done = true;
             return None;
         } else {

src/sniffer.rs

@@ -57,9 +57,7 @@ impl Sniffer {
     }
 
     /// The size of the sample to examine while sniffing. If using `SampleSize::Records`, the
-    /// sniffer will use the value provided with `terminator()` (or `Terminator::CRLF` if no
-    /// terminator is provided). Thus, `SampleSize::Records` may work unexpectedly for
-    /// non-CRLF-terminated files if the terminator is not provided.
+    /// sniffer will use the `Terminator::CRLF` as record separator.
     ///
     /// The sample size defaults to `SampleSize::Bytes(4096)`.
     pub fn sample_size(&mut self, sample_size: SampleSize) -> &mut Sniffer {

src/snip.rs

@@ -7,6 +7,9 @@ use error::*;
 pub(crate) fn preamble_skipcount<R: Read>(reader: &mut R, n_preamble_rows: usize)
     -> Result<usize>
 {
+    if n_preamble_rows == 0 {
+        return Ok(0);
+    }
     let mut skipcount = 0;
     loop {
         let cap = 1 << 12;