From bc32af2da5d9c1f6db95822263f1998803a6b267 Mon Sep 17 00:00:00 2001
From: nerodesu017 <adrian.popescu@oxidos.io>
Date: Tue, 17 Dec 2024 11:35:12 +0200
Subject: [PATCH] fix: fixed wrong check related to Span

---
 src/core/reader/mod.rs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/core/reader/mod.rs b/src/core/reader/mod.rs
index f263efbd..f7903905 100644
--- a/src/core/reader/mod.rs
+++ b/src/core/reader/mod.rs
@@ -47,7 +47,9 @@ impl<'a> WasmReader<'a> {
     /// [full_wasm_binary](WasmReader::full_wasm_binary), **if** the [Span]'s length is 0. For
     /// further information, refer to the [field documentation of `pc`](WasmReader::pc).
     pub fn move_start_to(&mut self, span: Span) -> Result<()> {
-        if span.from + span.len > self.full_wasm_binary.len() {
+        // Suppose we have from = 13 and len = 5 => 13,14,15,16,17
+        // If our whole file has only 17 bytes, this would throw an error if we wouldn't substract one
+        if span.from + span.len - 1 > self.full_wasm_binary.len() {
             return Err(Error::Eof);
         }