From 25ad2004c1d786a1dbe42d24c08f228c870210a4 Mon Sep 17 00:00:00 2001
From: nsfisis <nsfisis@gmail.com>
Date: Sat, 27 Apr 2024 17:51:09 +0900
Subject: feat: implement some missing instructions

---
 src/BinaryFormat/Decoder.php | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

(limited to 'src/BinaryFormat')

diff --git a/src/BinaryFormat/Decoder.php b/src/BinaryFormat/Decoder.php
index 30c5b56..c61fade 100644
--- a/src/BinaryFormat/Decoder.php
+++ b/src/BinaryFormat/Decoder.php
@@ -1052,10 +1052,14 @@ final class Decoder
             $shiftBits += 7;
             if ($b < 0b10000000) {
                 if (($b & 0b01000000) !== 0) {
-                    if ($shiftBits < $bits - 1) {
-                        $result |= -(1 << $shiftBits);
+                    if ($bits === 32) {
+                        $result |= (-1) ^ (1 << $shiftBits) - 1;
                     } else {
-                        $result |= 1 << $shiftBits;
+                        if ($shiftBits < $bits - 1) {
+                            $result |= -(1 << $shiftBits);
+                        } else {
+                            $result |= 1 << $shiftBits;
+                        }
                     }
                 }
                 return $result;
-- 
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