From b59c00590367f5acfd3d52acf9f5f34f6851756b Mon Sep 17 00:00:00 2001
From: humbertogontijo <96875138+humbertogontijo@users.noreply.github.com>
Date: Wed, 23 Jul 2025 20:12:51 -0300
Subject: [PATCH] Add isal gzip decompressor

---
 optional-requirements.txt      | 1 +
 telethon/tl/core/gzippacked.py | 5 ++++-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/optional-requirements.txt b/optional-requirements.txt
index 30326da9..dabb83a5 100644
--- a/optional-requirements.txt
+++ b/optional-requirements.txt
@@ -3,3 +3,4 @@ pysocks
 python-socks[asyncio]
 hachoir
 pillow
+isal
diff --git a/telethon/tl/core/gzippacked.py b/telethon/tl/core/gzippacked.py
index fb4094e4..b586a39e 100644
--- a/telethon/tl/core/gzippacked.py
+++ b/telethon/tl/core/gzippacked.py
@@ -1,4 +1,7 @@
-import gzip
+try:
+    from isal import igzip as gzip
+except ImportError:
+    import gzip
 import struct
 
 from .. import TLObject