From 5254d2ffd900a07a6be3e1387b8571dd5be0efbc Mon Sep 17 00:00:00 2001
From: stammw <begue.jc@gmail.com>
Date: Tue, 29 Jan 2019 11:55:39 +0100
Subject: [PATCH] QPACK: fix error when required_ref = 0 and delta_base = -0

---
 quinn-h3/src/qpack/block.rs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/quinn-h3/src/qpack/block.rs b/quinn-h3/src/qpack/block.rs
index 0c3e84710..9829b4ddf 100644
--- a/quinn-h3/src/qpack/block.rs
+++ b/quinn-h3/src/qpack/block.rs
@@ -89,7 +89,9 @@ impl HeaderPrefix {
             insert_count + total_inserted - wrapped
         };
 
-        let base = if !self.sign_negative {
+        let base = if required == 0 {
+            0
+        } else if !self.sign_negative {
             required + self.delta_base
         } else {
             if self.delta_base + 1 > required {