From 7b3a2c0a42c529eebb86dad138fb771254df67ec Mon Sep 17 00:00:00 2001
From: Paul Sokolovsky <pfalcon@users.sourceforge.net>
Date: Tue, 4 Oct 2016 00:13:53 +0300
Subject: [PATCH] upip: Update utarfile module, readinto() support.

---
 upip/upip_utarfile.py | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/upip/upip_utarfile.py b/upip/upip_utarfile.py
index 1644fcc8..719854f8 100644
--- a/upip/upip_utarfile.py
+++ b/upip/upip_utarfile.py
@@ -35,6 +35,15 @@ class FileSection:
         self.content_len -= sz
         return data
 
+    def readinto(self, buf):
+        if self.content_len == 0:
+            return 0
+        if len(buf) > self.content_len:
+            buf = memoryview(buf)[:self.content_len]
+        sz = self.f.readinto(buf)
+        self.content_len -= sz
+        return sz
+
     def skip(self):
         self.f.read(self.content_len + self.align)