upip: Update utarfile module, readinto() support.

pfalcon · pfalcon · commit 7b3a2c0a42c5 · 2016-10-04T00:13:53.000+03:00
diff --git a/upip/upip_utarfile.py b/upip/upip_utarfile.py
@@ -35,6 +35,15 @@ def read(self, sz=65536):
         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)
 
