From 2c28d3b44802d42db2e940c8e9e4c6eaaeb19c81 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Martin=20Habov=C5=A1tiak?= <martin.habovstiak@gmail.com>
Date: Thu, 21 Apr 2022 19:14:30 +0200
Subject: [PATCH] Fix handling of empty slice in Instructions

The code would've taken one element when an empty slice was requested.

Co-authored-by: Tobin C. Harding <me@tobin.cc>
---
 src/blockdata/script.rs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/blockdata/script.rs b/src/blockdata/script.rs
index 39f00312..524e48c4 100644
--- a/src/blockdata/script.rs
+++ b/src/blockdata/script.rs
@@ -746,7 +746,10 @@ impl<'a> Instructions<'a> {
     fn take_slice_or_kill(&mut self, len: usize) -> Result<&'a [u8], Error> {
         if self.data.len() >= len {
             let slice = &self.data.as_slice()[..len];
-            self.data.nth(len.max(1) - 1);
+            if len > 0 {
+                self.data.nth(len - 1);
+            }
+
             Ok(slice)
         } else {
             self.kill();