From c86849118c60f1f0a0f44f0685d05ec144ccf580 Mon Sep 17 00:00:00 2001
From: keiichi <keiichi>
Date: Thu, 21 Jan 1999 08:25:18 +0000
Subject: [PATCH] (lbt-to-string): New inline function.
 (encode-mime-charset-region): Add new optional argument
 `lbt'. (encode-mime-charset-string): Ditto.
 (decode-mime-charset-region): Use `lbt-to-string'.
 (decode-mime-charset-string): Ditto.

---
 mcs-om.el |   70 +++++++++++++++++++++++++++++++++++++++++++------------------
 1 file changed, 50 insertions(+), 20 deletions(-)

diff --git a/mcs-om.el b/mcs-om.el
index bff4150..eb71891 100644
--- a/mcs-om.el
+++ b/mcs-om.el
@@ -26,22 +26,38 @@
 
 (require 'poem)
 
-(defun encode-mime-charset-region (start end charset)
+(defsubst lbt-to-string (lbt)
+  (cdr (assq lbt '((nil . nil)
+		   (CRLF . "\r\n")
+		   (CR . "\r")
+		   (dos . "\r\n")
+		   (mac . "\r"))))
+  )
+
+(defun encode-mime-charset-region (start end charset &optional lbt)
   "Encode the text between START and END as MIME CHARSET."
-  (let ((cs (mime-charset-to-coding-system charset)))
+  (let ((cs (mime-charset-to-coding-system charset lbt)))
     (if cs
 	(code-convert start end *internal* cs)
-      )))
+      (if (and lbt (setq cs (mime-charset-to-coding-system charset)))
+	  (let ((newline (lbt-to-string lbt)))
+	    (save-excursion
+	      (save-restriction
+		(narrow-to-region start end)
+		(code-convert (point-min) (point-max) *internal* cs)
+		(if newline
+		    (goto-char (point-min))
+		  (while (search-forward "\n" nil t)
+		    (replace-match newline))))))))))
 
 (defun decode-mime-charset-region (start end charset &optional lbt)
   "Decode the text between START and END as MIME CHARSET."
-  (let ((cs (mime-charset-to-coding-system charset lbt))
-	newline)
+  (let ((cs (mime-charset-to-coding-system charset lbt)))
     (if cs
 	(code-convert start end cs *internal*)
       (if (and lbt (setq cs (mime-charset-to-coding-system charset)))
-	  (progn
-	    (if (setq newline (cdr (assq lbt '((CRLF . "\r\n") (CR . "\r")))))
+	  (let ((newline (lbt-to-string lbt)))
+	    (if newline
 		(save-excursion
 		  (save-restriction
 		    (narrow-to-region start end)
@@ -51,29 +67,39 @@
 		  (code-convert (point-min) (point-max) cs *internal*))
 	      (code-convert start end cs *internal*)))))))
 
-(defun encode-mime-charset-string (string charset)
+(defun encode-mime-charset-string (string charset &optional lbt)
   "Encode the STRING as MIME CHARSET."
-  (let ((cs (mime-charset-to-coding-system charset)))
+  (let ((cs (mime-charset-to-coding-system charset lbt)))
     (if cs
 	(code-convert-string string *internal* cs)
-      string)))
+      (if (and lbt (setq cs (mime-charset-to-coding-system charset)))
+	  (let ((newline (lbt-to-string lbt)))
+	    (if newline
+		(with-temp-buffer
+		  (insert string)
+		  (code-convert (point-min) (point-max) *internal* cs)
+		  (goto-char (point-min))
+		  (while (search-forward "\n" nil t)
+		    (replace-match newline))
+		  (buffer-string))
+	      (decode-coding-string string cs)))
+	string))))
 
 (defun decode-mime-charset-string (string charset &optional lbt)
   "Decode the STRING which is encoded in MIME CHARSET."
-  (let ((cs (mime-charset-to-coding-system charset lbt))
-	newline)
+  (let ((cs (mime-charset-to-coding-system charset lbt)))
     (if cs
 	(decode-coding-string string cs)
       (if (and lbt (setq cs (mime-charset-to-coding-system charset)))
-	  (progn
-	    (if (setq newline (cdr (assq lbt '((CRLF . "\r\n") (CR . "\r")))))
+	  (let ((newline (lbt-to-string lbt)))
+	    (if newline
 		(with-temp-buffer
-		 (insert string)
-		 (goto-char (point-min))
-		 (while (search-forward newline nil t)
-		   (replace-match "\n"))
-		 (code-convert (point-min) (point-max) cs *internal*)
-		 (buffer-string))
+		  (insert string)
+		  (goto-char (point-min))
+		  (while (search-forward newline nil t)
+		    (replace-match "\n"))
+		  (code-convert (point-min) (point-max) cs *internal*)
+		  (buffer-string))
 	      (decode-coding-string string cs)))
 	string))))
 
@@ -119,6 +145,10 @@
     ))
 
 (defsubst mime-charset-to-coding-system (charset &optional lbt)
+  "Return coding-system corresponding with CHARSET.
+CHARSET is a symbol whose name is MIME charset.
+If optional argument LBT (`CRLF', `LF', `CR', `unix', `dos' or `mac')
+is specified, it is used as line break code type of coding-system."
   (if (stringp charset)
       (setq charset (intern (downcase charset)))
     )
-- 
1.7.10.4