From c7bfe0e42eb72d941a8a131e870aefabd4547015 Mon Sep 17 00:00:00 2001
From: Serhiy Storchaka <storchaka@gmail.com>
Date: Mon, 17 Jun 2013 16:34:41 +0300
Subject: Issue #18167: cgi.FieldStorage no more fails to handle
 multipart/form-data when \r\n appears at end of 65535 bytes without other
 newlines.

---
 Lib/cgi.py | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'Lib/cgi.py')

diff --git a/Lib/cgi.py b/Lib/cgi.py
index 96b1f5721d..caa47f8012 100755
--- a/Lib/cgi.py
+++ b/Lib/cgi.py
@@ -786,6 +786,9 @@ class FieldStorage:
             if not line:
                 self.done = -1
                 break
+            if delim == b"\r":
+                line = delim + line
+                delim = b""
             if line.startswith(b"--") and last_line_lfend:
                 strippedline = line.rstrip()
                 if strippedline == next_boundary:
@@ -802,6 +805,12 @@ class FieldStorage:
                 delim = b"\n"
                 line = line[:-1]
                 last_line_lfend = True
+            elif line.endswith(b"\r"):
+                # We may interrupt \r\n sequences if they span the 2**16
+                # byte boundary
+                delim = b"\r"
+                line = line[:-1]
+                last_line_lfend = False
             else:
                 delim = b""
                 last_line_lfend = False
-- 
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