From e95ae8cc68510efa6e460a5e7ae5dd0bdda8aab0 Mon Sep 17 00:00:00 2001
From: zzz <zzz@i2pmail.org>
Date: Mon, 27 Jul 2026 16:14:36 -0400
Subject: [PATCH] Datagram: handle empty repliable datagram payload

Datagram 1, as allowed by spec.

(from GH PR #164 by acetone)
---
 .../src/net/i2p/client/datagram/I2PDatagramDissector.java     | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/core/java/src/net/i2p/client/datagram/I2PDatagramDissector.java b/core/java/src/net/i2p/client/datagram/I2PDatagramDissector.java
index e40114293..0e23825ef 100644
--- a/core/java/src/net/i2p/client/datagram/I2PDatagramDissector.java
+++ b/core/java/src/net/i2p/client/datagram/I2PDatagramDissector.java
@@ -88,7 +88,9 @@ public final class I2PDatagramDissector {
             
             // read payload
             rxPayloadLen = dgStream.read(rxPayload);
-            
+            if (rxPayloadLen < 0)
+                rxPayloadLen = 0;
+
             // calculate the hash of the payload
             if (type == SigType.DSA_SHA1) {
                 if (rxHash == null)