From 192f8ebd28f53319540fb78bc821a49f5237ec28 Mon Sep 17 00:00:00 2001
From: Simon Ser <contact@emersion.fr>
Date: Sat, 21 Dec 2024 14:38:08 +0100
Subject: [PATCH] imapserver: include partial offset in BINARY FETCH response

See https://www.rfc-editor.org/errata/eid8217
---
 imapserver/fetch.go | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/imapserver/fetch.go b/imapserver/fetch.go
index b04b72c2..adadc4a8 100644
--- a/imapserver/fetch.go
+++ b/imapserver/fetch.go
@@ -433,7 +433,11 @@ func (w *FetchResponseWriter) WriteBinarySection(section *imap.FetchItemBinarySe
 
 	enc.Atom("BINARY").Special('[')
 	writeSectionPart(enc, section.Part)
-	enc.Special(']').SP()
+	enc.Special(']')
+	if partial := section.Partial; partial != nil {
+		enc.Special('<').Number(uint32(partial.Offset)).Special('>')
+	}
+	enc.SP()
 	enc.Special('~') // indicates literal8
 	return w.enc.Literal(size)
 }