From 8c40edc34e405b333f9ee2f6a118c2003995eb29 Mon Sep 17 00:00:00 2001
From: yamaoka <yamaoka>
Date: Sat, 15 Mar 2003 00:27:45 +0000
Subject: [PATCH] Synch to Oort Gnus 200303142234.

---
 lisp/ChangeLog    |    9 +++++++++
 lisp/mm-bodies.el |   16 +++++++++++++++-
 lisp/rfc2047.el   |    9 +++++++--
 3 files changed, 31 insertions(+), 3 deletions(-)

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index a1c51ed..6f6a52f 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,12 @@
+2003-03-14  Jesper Harder  <harder@ifa.au.dk>
+
+	* mm-bodies.el (mm-decode-coding-region-safely): New function.
+	(mm-decode-body): Use it.
+
+	* rfc2047.el (rfc2047-decode-region): do.
+	(rfc2047-decode-string): Guess coding system if the default is
+	invalid.
+
 2003-03-12  Paul Jarc  <prj@po.cwru.edu>
 
 	* nnmaildir.el (nnmaildir-request-update-info): Pretend missing
diff --git a/lisp/mm-bodies.el b/lisp/mm-bodies.el
index e672e33..ec33d6d 100644
--- a/lisp/mm-bodies.el
+++ b/lisp/mm-bodies.el
@@ -271,7 +271,21 @@ The characters in CHARSET should then be decoded."
 		   (or (not (eq coding-system 'ascii))
 		       (setq coding-system mail-parse-charset))
 		   (not (eq coding-system 'gnus-decoded)))
-	  (mm-decode-coding-region (point-min) (point-max) coding-system))))))
+	  (mm-decode-coding-region-safely (point-min) (point-max)
+					  coding-system))))))
+
+(defun mm-decode-coding-region-safely (start end coding-system)
+  "Decode region between START and END with CODING-SYSTEM.
+If CODING-SYSTEM is not a valid coding system for the text, let Emacs
+decide which coding system to use."
+  (let* ((decoded (mm-decode-coding-string (buffer-substring start end)
+					   coding-system))
+	 (charsets (find-charset-string decoded)))
+    (if (or (memq 'eight-bit-control charsets)
+	    (memq 'eight-bit-graphic charsets))
+	(mm-decode-coding-region start end 'undecided)
+      (delete-region start end)
+      (insert decoded))))
 
 (defun mm-decode-string (string charset)
   "Decode STRING with CHARSET."
diff --git a/lisp/rfc2047.el b/lisp/rfc2047.el
index 8fd737f..9bb8c0f 100644
--- a/lisp/rfc2047.el
+++ b/lisp/rfc2047.el
@@ -538,7 +538,7 @@ The buffer may be narrowed."
 		   mail-parse-charset
 		   (not (eq mail-parse-charset 'us-ascii))
 		   (not (eq mail-parse-charset 'gnus-decoded)))
-	  (mm-decode-coding-region b (point-max) mail-parse-charset))))))
+	  (mm-decode-coding-region-safely b (point-max) mail-parse-charset))))))
 
 (defun rfc2047-decode-string (string)
   "Decode the quoted-printable-encoded STRING and return the results."
@@ -555,7 +555,12 @@ The buffer may be narrowed."
 	       mail-parse-charset
 	       (not (eq mail-parse-charset 'us-ascii))
 	       (not (eq mail-parse-charset 'gnus-decoded)))
-	  (mm-decode-coding-string string mail-parse-charset)
+	  (let* ((decoded (mm-decode-coding-string string mail-parse-charset))
+		 (charsets (find-charset-string decoded)))
+	    (if (or (memq 'eight-bit-control charsets)
+		    (memq 'eight-bit-graphic charsets))
+		(mm-decode-coding-string string 'undecided)
+	      decoded))
 	string))))
 
 (defun rfc2047-parse-and-decode (word)
-- 
1.7.10.4