From 9d82904011516530b6ef1bcd53cef220db485e7a Mon Sep 17 00:00:00 2001
From: Arun Isaac
Date: Sat, 28 Sep 2019 13:27:33 +0530
Subject: email: Tolerate decoding errors in MIME encoded words.

* email/email.scm (decode-mime-encoded-word): Tolerate decoding errors
in MIME encoded words using the substitute conversion strategy.
* tests/email.scm ("tolerate decoding errors in MIME encoded words"):
New test.

Reported-by: Christopher Baines <mail@cbaines.net>
---
 email/email.scm | 2 +-
 tests/email.scm | 6 ++++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/email/email.scm b/email/email.scm
index ef2efe9..a791a0e 100644
--- a/email/email.scm
+++ b/email/email.scm
@@ -564,7 +564,7 @@
                 ((q) q-encoding-decode)
                 (else (error "Encoding of MIME word unknown" word)))
               encoded-text)
-             charset)))
+             charset 'substitute)))
    'post))
 
 (define (body->mime-entities body boundary)
diff --git a/tests/email.scm b/tests/email.scm
index 1346b20..ca0ebc3 100644
--- a/tests/email.scm
+++ b/tests/email.scm
@@ -351,4 +351,10 @@ body" "iso-8859-1"))
     (content-transfer-encoding . 7bit)
     (subject . "Foo Bãr")))
 
+(test-equal "tolerate decoding errors in MIME encoded words"
+  ((module-ref (resolve-module '(email email))
+               'decode-mime-encoded-word)
+   "=?UTF-8?Q?B=E8r?=")
+  "B�r")
+
 (test-end "email")
-- 
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