From 2ca1527321d7e6b65bcab45d304be82d65f3c4f4 Mon Sep 17 00:00:00 2001
From: Paul Sokolovsky <pfalcon@users.sourceforge.net>
Date: Tue, 11 Oct 2016 00:08:04 +0300
Subject: [PATCH] upip: upip_utarfile.skip(): Optimize for memory usage.

---
 upip/upip_utarfile.py | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/upip/upip_utarfile.py b/upip/upip_utarfile.py
index 0570faf5..65ce0bdc 100644
--- a/upip/upip_utarfile.py
+++ b/upip/upip_utarfile.py
@@ -39,7 +39,13 @@ class FileSection:
         return sz
 
     def skip(self):
-        self.f.read(self.content_len + self.align)
+        sz = self.content_len + self.align
+        if sz:
+            buf = bytearray(16)
+            while sz:
+                s = min(sz, 16)
+                self.f.readinto(buf, s)
+                sz -= s
 
 class TarInfo: