From 6532e4f4a94ada35c958cf53e1f98aaf175188c6 Mon Sep 17 00:00:00 2001
From: Jan Tuomi <jan@jantuomi.fi>
Date: Sat, 5 Oct 2024 10:00:45 +0200
Subject: Split log_reader into reverse_log_reader and forward_log_reader

---
 src/common.rs | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

(limited to 'src/common.rs')

diff --git a/src/common.rs b/src/common.rs
index 9ea43aa..ea179ab 100644
--- a/src/common.rs
+++ b/src/common.rs
@@ -39,6 +39,22 @@ pub const SEQ_LIT_FIELD_SEP: &[u8] = &[
     ESCAPE_CHARACTER,
 ];
 
+/// There are three special sequences that need to be handled:
+/// Here: SC = escape char, FS = field separator.
+/// - SC FS FS SC  -> actual record separator
+/// - SC SC FS SC  -> literal FS
+/// - SC SC SC SC  -> literal SC
+///
+/// Returns SpecialSequence or None if not valid.
+pub fn validate_special(buf: &[u8]) -> Option<SpecialSequence> {
+    match buf {
+        SEQ_RECORD_SEP => Some(SpecialSequence::RecordSeparator),
+        SEQ_LIT_FIELD_SEP => Some(SpecialSequence::LiteralFieldSeparator),
+        SEQ_LIT_ESCAPE => Some(SpecialSequence::LiteralEscape),
+        _ => None,
+    }
+}
+
 #[derive(Debug, Eq, PartialEq)]
 pub enum SpecialSequence {
     RecordSeparator,
-- 
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