X-Git-Url: http://git.chise.org/gitweb/?a=blobdiff_plain;f=lisp%2Fmm-util.el;h=29436800fecca1b27eb3d9ff3e2ac08f51a1bffb;hb=a707b63af25b91cb730c12e65156ca364bf49a44;hp=c8800b0ca79d1cf47622b9908542f2c581256f6a;hpb=baa7cb7f6c13f0609cb29ebefcff7a8fbd0d15e3;p=elisp%2Fgnus.git-

diff --git a/lisp/mm-util.el b/lisp/mm-util.el
index c8800b0..2943680 100644
--- a/lisp/mm-util.el
+++ b/lisp/mm-util.el
@@ -1,5 +1,5 @@
-;;; mm-util.el --- Utility functions for MIME things
-;; Copyright (C) 1998 Free Software Foundation, Inc.
+;;; mm-util.el --- Utility functions for Mule and low level things
+;; Copyright (C) 1998, 1999, 2000 Free Software Foundation, Inc.
 
 ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
 ;;	MORIOKA Tomohiko <morioka@jaist.ac.jp>
@@ -24,8 +24,8 @@
 
 ;;; Code:
 
-(defvar mm-known-charsets '(iso-8859-1)
-  "List of known charsets.")
+(eval-when-compile (require 'cl))
+(require 'mail-prsvr)
 
 (defvar mm-mime-mule-charset-alist
   '((us-ascii ascii)
@@ -34,20 +34,27 @@
     (iso-8859-3 latin-iso8859-3)
     (iso-8859-4 latin-iso8859-4)
     (iso-8859-5 cyrillic-iso8859-5)
-    (koi8-r cyrillic-iso8859-5)
+    ;; Non-mule (X)Emacs uses the last mule-charset for 8bit characters.
+    ;; The fake mule-charset, gnus-koi8-r, tells Gnus that the default 
+    ;; charset is koi8-r, not iso-8859-5.
+    (koi8-r cyrillic-iso8859-5 gnus-koi8-r)
     (iso-8859-6 arabic-iso8859-6)
     (iso-8859-7 greek-iso8859-7)
     (iso-8859-8 hebrew-iso8859-8)
     (iso-8859-9 latin-iso8859-9)
-    (iso-2022-jp latin-jisx0201
-		 japanese-jisx0208-1978 japanese-jisx0208)
+    (viscii vietnamese-viscii-lower)
+    (iso-2022-jp latin-jisx0201 japanese-jisx0208 japanese-jisx0208-1978)
     (euc-kr korean-ksc5601)
     (cn-gb-2312 chinese-gb2312)
     (cn-big5 chinese-big5-1 chinese-big5-2)
+    (tibetan tibetan)
+    (thai-tis620 thai-tis620)
+    (iso-2022-7bit ethiopic arabic-1-column arabic-2-column)
     (iso-2022-jp-2 latin-iso8859-1 greek-iso8859-7
 		   latin-jisx0201 japanese-jisx0208-1978
 		   chinese-gb2312 japanese-jisx0208
-		   korean-ksc5601 japanese-jisx0212)
+		   korean-ksc5601 japanese-jisx0212
+		   katakana-jisx0201)
     (iso-2022-int-1 latin-iso8859-1 greek-iso8859-7
 		    latin-jisx0201 japanese-jisx0208-1978
 		    chinese-gb2312 japanese-jisx0208
@@ -61,67 +68,122 @@
 		    chinese-cns11643-1 chinese-cns11643-2
 		    chinese-cns11643-3 chinese-cns11643-4
 		    chinese-cns11643-5 chinese-cns11643-6
-		    chinese-cns11643-7))
+		    chinese-cns11643-7)
+    (utf-8 unicode-a unicode-b unicode-c unicode-d unicode-e))
   "Alist of MIME-charset/MULE-charsets.")
 
+(eval-and-compile
+  (mapcar
+   (lambda (elem)
+     (let ((nfunc (intern (format "mm-%s" (car elem)))))
+       (if (fboundp (car elem))
+	   (defalias nfunc (car elem))
+	 (defalias nfunc (cdr elem)))))
+   '((decode-coding-string . (lambda (s a) s))
+     (encode-coding-string . (lambda (s a) s))
+     (encode-coding-region . ignore)
+     (coding-system-list . ignore)
+     (decode-coding-region . ignore)
+     (char-int . identity)
+     (device-type . ignore)
+     (coding-system-equal . equal)
+     (annotationp . ignore)
+     (set-buffer-file-coding-system . ignore)
+     (make-char
+      . (lambda (charset int)
+	  (int-to-char int)))
+     (read-coding-system
+      . (lambda (prompt)
+	  "Prompt the user for a coding system."
+	  (completing-read
+	   prompt (mapcar (lambda (s) (list (symbol-name (car s))))
+			  mm-mime-mule-charset-alist))))
+     (read-charset
+      . (lambda (prompt)
+	  "Return a charset."
+	  (intern
+	   (completing-read
+	    prompt
+	    (mapcar (lambda (e) (list (symbol-name (car e))))
+		    mm-mime-mule-charset-alist)
+	    nil t))))
+     (subst-char-in-string
+      . (lambda (from to string) ;; stolen (and renamed) from nnheader.el
+	  "Replace characters in STRING from FROM to TO."
+	  (let ((string (substring string 0))	;Copy string.
+		(len (length string))
+		(idx 0))
+	    ;; Replace all occurrences of FROM with TO.
+	    (while (< idx len)
+	      (when (= (aref string idx) from)
+		(aset string idx to))
+	      (setq idx (1+ idx)))
+	    string)))
+      )))
 
 (eval-and-compile
-  (if (fboundp 'decode-coding-string)
-      (fset 'mm-decode-coding-string 'decode-coding-string)
-    (fset 'mm-decode-coding-string (lambda (s a) s)))
-
-  (if (fboundp 'encode-coding-string)
-      (fset 'mm-encode-coding-string 'encode-coding-string)
-    (fset 'mm-encode-coding-string (lambda (s a) s)))
-
-  (if (fboundp 'encode-coding-region)
-      (fset 'mm-encode-coding-region 'encode-coding-region)
-    (fset 'mm-encode-coding-region 'ignore))
-
-  (if (fboundp 'decode-coding-region)
-      (fset 'mm-decode-coding-region 'decode-coding-region)
-    (fset 'mm-decode-coding-region 'ignore))
-
-  (if (fboundp 'coding-system-list)
-      (fset 'mm-coding-system-list 'coding-system-list)
-    (fset 'mm-coding-system-list 'ignore))
-
-  (if (fboundp 'char-int)
-      (fset 'mm-char-int 'char-int)
-    (fset 'mm-char-int 'identity))
-
-  (if (fboundp 'coding-system-equal)
-      (fset 'mm-coding-system-equal 'coding-system-equal)
-    (fset 'mm-coding-system-equal 'equal))
-
-  (if (fboundp 'read-coding-system)
-      (fset 'mm-read-coding-system 'read-coding-system)
-    (defun mm-read-coding-system (prompt)
-      "Prompt the user for a coding system."
-      (completing-read
-       prompt (mapcar (lambda (s) (list (symbol-name (car s))))
-		      mm-mime-mule-charset-alist)))))
-
-
-(defvar mm-charset-coding-system-alist
-  (let ((rest
-	 '((us-ascii . iso-8859-1)
-	   (gb2312 . cn-gb-2312)
-	   (iso-2022-jp-2 . iso-2022-7bit-ss2)
-	   (x-ctext . ctext)))
-	(systems (mm-coding-system-list))
-	dest)
-    (while rest
-      (let ((pair (car rest)))
-	(unless (memq (car pair) systems)
-	  (setq dest (cons pair dest))))
-      (setq rest (cdr rest)))
-    dest)
-  "Charset/coding system alist.")
+  (defalias 'mm-char-or-char-int-p
+    (cond 
+     ((fboundp 'char-or-char-int-p) 'char-or-char-int-p)
+     ((fboundp 'char-valid-p) 'char-valid-p) 
+     (t 'identity))))
+
+(defvar mm-coding-system-list nil)
+(defun mm-get-coding-system-list ()
+  "Get the coding system list."
+  (or mm-coding-system-list
+      (setq mm-coding-system-list (mm-coding-system-list))))
+
+(defun mm-coding-system-p (sym)
+  "Return non-nil if SYM is a coding system."
+  (or (and (fboundp 'coding-system-p) (coding-system-p sym))
+      (memq sym (mm-get-coding-system-list))))
+
+(defvar mm-charset-synonym-alist
+  `((big5 . cn-big5)
+    (gb2312 . cn-gb-2312)
+    (cn-gb . cn-gb-2312)
+    ;; Windows-1252 is actually a superset of Latin-1.  See also
+    ;; `gnus-article-dumbquotes-map'.
+    ,(unless (mm-coding-system-p 'windows-1252) ; should be defined eventually
+       '(windows-1252 . iso-8859-1))
+    (x-ctext . ctext))
+  "A mapping from invalid charset names to the real charset names.")
+
+(defvar mm-binary-coding-system
+  (cond 
+   ((mm-coding-system-p 'binary) 'binary)
+   ((mm-coding-system-p 'no-conversion) 'no-conversion)
+   (t nil))
+  "100% binary coding system.")
+
+(defvar mm-text-coding-system
+  (or (if (memq system-type '(windows-nt ms-dos ms-windows))
+	  (and (mm-coding-system-p 'raw-text-dos) 'raw-text-dos)
+	(and (mm-coding-system-p 'raw-text) 'raw-text))
+      mm-binary-coding-system)
+  "Text-safe coding system (For removing ^M).")
+
+(defvar mm-text-coding-system-for-write nil
+  "Text coding system for write.")
+
+(defvar mm-auto-save-coding-system
+  (cond 
+   ((mm-coding-system-p 'emacs-mule)
+    (if (memq system-type '(windows-nt ms-dos ms-windows))
+	(if (mm-coding-system-p 'emacs-mule-dos) 
+	    'emacs-mule-dos mm-binary-coding-system)
+      'emacs-mule))
+   ((mm-coding-system-p 'escape-quoted) 'escape-quoted)
+   (t mm-binary-coding-system))
+  "Coding system of auto save file.")
+
+;;; Internal variables:
 
+;;; Functions:
 
 (defun mm-mule-charset-to-mime-charset (charset)
-  "Return the MIME charset corresponding to MULE CHARSET."
+  "Return the MIME charset corresponding to the given Mule CHARSET."
   (let ((alist mm-mime-mule-charset-alist)
 	out)
     (while alist
@@ -139,67 +201,344 @@ used as the line break code type of the coding system."
   (when (stringp charset)
     (setq charset (intern (downcase charset))))
   (setq charset
-	(or (cdr (assq charset mm-charset-coding-system-alist))
+	(or (cdr (assq charset mm-charset-synonym-alist))
 	    charset))
   (when lbt
     (setq charset (intern (format "%s-%s" charset lbt))))
   (cond
    ;; Running in a non-MULE environment.
-   ((and (null (mm-coding-system-list))
-	 (memq charset mm-known-charsets))
+   ((null (mm-get-coding-system-list))
     charset)
-   ;; Check to see whether we can handle this charset.
-   ((memq charset (mm-coding-system-list))
+   ;; ascii
+   ((eq charset 'us-ascii)
+    'ascii)
+   ;; Check to see whether we can handle this charset.  (This depends
+   ;; on there being some coding system matching each `mime-charset'
+   ;; coding sysytem property defined, as there should be.)
+   ((memq charset (mm-get-coding-system-list))
     charset)
    ;; Nope.
    (t
     nil)))
 
-(defun mm-replace-chars-in-string (string from to)
-  "Replace characters in STRING from FROM to TO."
-  (let ((string (substring string 0))	;Copy string.
-	(len (length string))
-	(idx 0))
-    ;; Replace all occurrences of FROM with TO.
-    (while (< idx len)
-      (when (= (aref string idx) from)
-	(aset string idx to))
-      (setq idx (1+ idx)))
-    string))
-
-(defun mm-enable-multibyte ()
-  "Enable multibyte in the current buffer."
-  (when (fboundp 'set-buffer-multibyte)
+(defsubst mm-replace-chars-in-string (string from to)
+  (mm-subst-char-in-string from to string))
+
+(defsubst mm-enable-multibyte ()
+  "Set the multibyte flag of the current buffer.
+Only do this if the default value of `enable-multibyte-characters' is
+non-nil.  This is a no-op in XEmacs."
+  (when (and (not (featurep 'xemacs))
+             (boundp 'default-enable-multibyte-characters)
+	     default-enable-multibyte-characters
+	     (fboundp 'set-buffer-multibyte))
+    (set-buffer-multibyte t)))
+
+(defsubst mm-disable-multibyte ()
+  "Unset the multibyte flag of in the current buffer.
+This is a no-op in XEmacs."
+  (when (and (not (featurep 'xemacs))
+	     (fboundp 'set-buffer-multibyte))
+    (set-buffer-multibyte nil)))
+
+(defsubst mm-enable-multibyte-mule4 ()
+  "Enable multibyte in the current buffer.
+Only used in Emacs Mule 4."
+  (when (and (not (featurep 'xemacs))
+             (boundp 'default-enable-multibyte-characters)
+	     default-enable-multibyte-characters
+	     (fboundp 'set-buffer-multibyte)
+	     (fboundp 'charsetp)
+	     (not (charsetp 'eight-bit-control)))
     (set-buffer-multibyte t)))
 
-(defun mm-insert-rfc822-headers (charset encoding)
-  "Insert text/plain headers with CHARSET and ENCODING."
-  (insert "MIME-Version: 1.0\n")
-  (insert "Content-Type: text/plain; charset=\""
-	  (downcase (symbol-name charset)) "\"\n")
-  (insert "Content-Transfer-Encoding: "
-	  (downcase (symbol-name encoding)) "\n"))
+(defsubst mm-disable-multibyte-mule4 ()
+  "Disable multibyte in the current buffer.
+Only used in Emacs Mule 4."
+  (when (and (not (featurep 'xemacs))
+	     (fboundp 'set-buffer-multibyte)
+	     (fboundp 'charsetp)
+	     (not (charsetp 'eight-bit-control)))
+    (set-buffer-multibyte nil)))
 
-(defun mm-content-type-charset (header)
-  "Return the charset parameter from HEADER."
-  (when (string-match "charset *= *\"? *\\([-0-9a-zA-Z_]+\\)\"? *$" header)
-    (intern (downcase (match-string 1 header)))))
+(defun mm-preferred-coding-system (charset)
+  ;; A typo in some Emacs versions.
+  (or (get-charset-property charset 'prefered-coding-system)
+      (get-charset-property charset 'preferred-coding-system)))
 
+(defun mm-charset-after (&optional pos)
+  "Return charset of a character in current buffer at position POS.
+If POS is nil, it defauls to the current point.
+If POS is out of range, the value is nil.
+If the charset is `composition', return the actual one."
+  (let ((char (char-after pos)) charset)
+    (if (< (mm-char-int char) 128)
+	(setq charset 'ascii)
+      ;; charset-after is fake in some Emacsen.
+      (setq charset (and (fboundp 'char-charset) (char-charset char)))
+      (if (eq charset 'composition)
+	  (let ((p (or pos (point))))
+	    (cadr (find-charset-region p (1+ p))))
+	(if (and charset (not (memq charset '(ascii eight-bit-control
+						    eight-bit-graphic))))
+	    charset
+	  (or
+	   mail-parse-mule-charset ;; cached mule-charset
+	   (progn
+	     (setq mail-parse-mule-charset
+		   (and (boundp 'current-language-environment)
+		      (car (last 
+			    (assq 'charset 
+				  (assoc current-language-environment 
+					 language-info-alist))))))
+	     (if (or (not mail-parse-mule-charset)
+		     (eq mail-parse-mule-charset 'ascii))
+		 (setq mail-parse-mule-charset
+		       (or (car (last (assq mail-parse-charset
+					    mm-mime-mule-charset-alist)))
+			   'latin-iso8859-1)))
+	     mail-parse-mule-charset)))))))
 
-(defun mm-mime-charset (charset b e)
-  (if (fboundp 'coding-system-get)
+(defun mm-mime-charset (charset)
+  "Return the MIME charset corresponding to the MULE CHARSET."
+  (if (eq charset 'unknown)
+      (error "8-bit characters are found in the message, please specify charset."))
+  (if (and (fboundp 'coding-system-get) (fboundp 'get-charset-property))
+      ;; This exists in Emacs 20.
       (or
-       (coding-system-get
-	(get-charset-property charset 'prefered-coding-system)
-	'mime-charset)
-       (car (memq charset (find-coding-systems-region
-			   (point-min) (point-max)))))
+       (and (mm-preferred-coding-system charset)
+	    (coding-system-get
+	     (mm-preferred-coding-system charset) 'mime-charset))
+       (and (eq charset 'ascii)
+	    'us-ascii)
+       (mm-preferred-coding-system charset)
+       (mm-mule-charset-to-mime-charset charset))
+    ;; This is for XEmacs.
     (mm-mule-charset-to-mime-charset charset)))
 
-(defun mm-multibyte-p ()
+(defun mm-delete-duplicates (list)
+  "Simple  substitute for CL `delete-duplicates', testing with `equal'."
+  (let (result head)
+    (while list
+      (setq head (car list))
+      (setq list (delete head list))
+      (setq result (cons head result)))
+    (nreverse result)))
+
+(defun mm-find-mime-charset-region (b e)
+  "Return the MIME charsets needed to encode the region between B and E."
+  (let ((charsets (mapcar 'mm-mime-charset
+			  (delq 'ascii
+				(mm-find-charset-region b e)))))
+    (when (memq 'iso-2022-jp-2 charsets)
+      (setq charsets (delq 'iso-2022-jp charsets)))
+    (setq charsets (mm-delete-duplicates charsets))
+    (if (and (> (length charsets) 1)
+	     (fboundp 'find-coding-systems-region)
+	     (memq 'utf-8 (find-coding-systems-region b e)))
+	'(utf-8)
+      charsets)))
+
+(defsubst mm-multibyte-p ()
   "Say whether multibyte is enabled."
-  (and (boundp 'enable-multibyte-characters)
-       enable-multibyte-characters))
+  (if (and (not (featurep 'xemacs))
+	   (boundp 'enable-multibyte-characters))
+      enable-multibyte-characters
+    (featurep 'mule)))
+
+(defmacro mm-with-unibyte-buffer (&rest forms)
+  "Create a temporary buffer, and evaluate FORMS there like `progn'.
+Use unibyte mode for this."
+  `(let (default-enable-multibyte-characters)
+     (with-temp-buffer ,@forms)))
+(put 'mm-with-unibyte-buffer 'lisp-indent-function 0)
+(put 'mm-with-unibyte-buffer 'edebug-form-spec '(body))
+
+(defmacro mm-with-unibyte-current-buffer (&rest forms)
+  "Evaluate FORMS with current current buffer temporarily made unibyte.
+Also bind `default-enable-multibyte-characters' to nil.
+Equivalent to `progn' in XEmacs"
+  (let ((buffer (make-symbol "buffer")))
+    `(if (and (not (featurep 'xemacs))
+	      (boundp 'enable-multibyte-characters)
+	      enable-multibyte-characters
+	      (fboundp 'set-buffer-multibyte))
+	 (let ((,buffer (current-buffer)))
+	   (unwind-protect
+	       (let (default-enable-multibyte-characters)
+		 (set-buffer-multibyte nil)
+		 ,@forms)
+	     (set-buffer ,buffer)
+	     (set-buffer-multibyte t)))
+       (let (default-enable-multibyte-characters)
+	 ,@forms))))
+(put 'mm-with-unibyte-current-buffer 'lisp-indent-function 0)
+(put 'mm-with-unibyte-current-buffer 'edebug-form-spec '(body))
+
+(defmacro mm-with-unibyte-current-buffer-mule4 (&rest forms)
+  "Evaluate FORMS there like `progn' in current buffer.
+Mule4 only."
+  (let ((buffer (make-symbol "buffer")))
+    `(if (and (not (featurep 'xemacs))
+	      (boundp 'enable-multibyte-characters)
+	      enable-multibyte-characters
+	      (fboundp 'set-buffer-multibyte)
+	      (fboundp 'charsetp)
+	      (not (charsetp 'eight-bit-control))) ;; For Emacs Mule 4 only.
+       (let ((,buffer (current-buffer)))
+	 (unwind-protect
+	     (let (default-enable-multibyte-characters)
+	       (set-buffer-multibyte nil)
+	       ,@forms)
+	   (set-buffer ,buffer)
+	   (set-buffer-multibyte t)))
+       (let (default-enable-multibyte-characters)
+	 ,@forms))))
+(put 'mm-with-unibyte-current-buffer-mule4 'lisp-indent-function 0)
+(put 'mm-with-unibyte-current-buffer-mule4 'edebug-form-spec '(body))
+
+(defmacro mm-with-unibyte (&rest forms)
+  "Eval the FORMS with the default value of `enable-multibyte-characters' nil, ."
+  `(let (default-enable-multibyte-characters)
+     ,@forms))
+(put 'mm-with-unibyte 'lisp-indent-function 0)
+(put 'mm-with-unibyte 'edebug-form-spec '(body))
+
+(defun mm-find-charset-region (b e)
+  "Return a list of Emacs charsets in the region B to E."
+  (cond
+   ((and (mm-multibyte-p)
+ 	 (fboundp 'find-charset-region))
+    ;; Remove composition since the base charsets have been included.
+    ;; Remove eight-bit-*, treat them as ascii.
+    (let ((css (find-charset-region b e)))
+      (mapcar (lambda (cs) (setq css (delq cs css)))
+	      '(composition eight-bit-control eight-bit-graphic))
+      css))
+   (t
+    ;; We are in a unibyte buffer or XEmacs non-mule, so we futz around a bit.
+    (save-excursion
+      (save-restriction
+	(narrow-to-region b e)
+	(goto-char (point-min))
+	(skip-chars-forward "\0-\177")
+	(if (eobp)
+	    '(ascii)
+	  (let (charset)
+	    (setq charset
+		  (and (boundp 'current-language-environment)
+		       (car (last (assq 'charset 
+					(assoc current-language-environment 
+					       language-info-alist))))))
+	    (if (eq charset 'ascii) (setq charset nil))
+	    (or charset
+		(setq charset
+		      (car (last (assq mail-parse-charset
+				       mm-mime-mule-charset-alist)))))
+	    (list 'ascii (or charset 'latin-iso8859-1)))))))))
+
+(if (fboundp 'shell-quote-argument)
+    (defalias 'mm-quote-arg 'shell-quote-argument)
+  (defun mm-quote-arg (arg)
+    "Return a version of ARG that is safe to evaluate in a shell."
+    (let ((pos 0) new-pos accum)
+      ;; *** bug: we don't handle newline characters properly
+      (while (setq new-pos (string-match "[]*[;!'`\"$\\& \t{} |()<>]" arg pos))
+	(push (substring arg pos new-pos) accum)
+	(push "\\" accum)
+	(push (list (aref arg new-pos)) accum)
+	(setq pos (1+ new-pos)))
+      (if (= pos 0)
+	  arg
+	(apply 'concat (nconc (nreverse accum) (list (substring arg pos))))))))
+
+(defun mm-auto-mode-alist ()
+  "Return an `auto-mode-alist' with only the .gz (etc) thingies."
+  (let ((alist auto-mode-alist)
+	out)
+    (while alist
+      (when (listp (cdar alist))
+	(push (car alist) out))
+      (pop alist))
+    (nreverse out)))
+
+(defvar mm-inhibit-file-name-handlers
+  '(jka-compr-handler)
+  "A list of handlers doing (un)compression (etc) thingies.")
+
+(defun mm-insert-file-contents (filename &optional visit beg end replace
+					 inhibit)
+  "Like `insert-file-contents', q.v., but only reads in the file.
+A buffer may be modified in several ways after reading into the buffer due
+to advanced Emacs features, such as file-name-handlers, format decoding,
+find-file-hooks, etc.
+If INHIBIT is non-nil, inhibit mm-inhibit-file-name-handlers.
+  This function ensures that none of these modifications will take place."
+  (let ((format-alist nil)
+	(auto-mode-alist (if inhibit nil (mm-auto-mode-alist)))
+	(default-major-mode 'fundamental-mode)
+	(enable-local-variables nil)
+        (after-insert-file-functions nil)
+	(enable-local-eval nil)
+	(find-file-hooks nil)
+	(inhibit-file-name-operation (if inhibit 
+					 'insert-file-contents
+				       inhibit-file-name-operation))
+	(inhibit-file-name-handlers
+	 (if inhibit
+	     (append mm-inhibit-file-name-handlers 
+		     inhibit-file-name-handlers)
+	   inhibit-file-name-handlers)))
+    (insert-file-contents filename visit beg end replace)))
+
+(defun mm-append-to-file (start end filename &optional codesys inhibit)
+  "Append the contents of the region to the end of file FILENAME.
+When called from a function, expects three arguments,
+START, END and FILENAME.  START and END are buffer positions
+saying what text to write.
+Optional fourth argument specifies the coding system to use when
+encoding the file.
+If INHIBIT is non-nil, inhibit mm-inhibit-file-name-handlers."
+  (let ((coding-system-for-write 
+	 (or codesys mm-text-coding-system-for-write 
+	     mm-text-coding-system))
+	(inhibit-file-name-operation (if inhibit 
+					 'append-to-file
+				       inhibit-file-name-operation))
+	(inhibit-file-name-handlers
+	 (if inhibit
+	     (append mm-inhibit-file-name-handlers 
+		     inhibit-file-name-handlers)
+	   inhibit-file-name-handlers)))
+    (append-to-file start end filename)))
+
+(defun mm-write-region (start end filename &optional append visit lockname 
+			      coding-system inhibit)
+
+  "Like `write-region'.
+If INHIBIT is non-nil, inhibit mm-inhibit-file-name-handlers."
+  (let ((coding-system-for-write 
+	 (or coding-system mm-text-coding-system-for-write 
+	     mm-text-coding-system))
+	(inhibit-file-name-operation (if inhibit 
+					 'write-region
+				       inhibit-file-name-operation))
+	(inhibit-file-name-handlers
+	 (if inhibit
+	     (append mm-inhibit-file-name-handlers 
+		     inhibit-file-name-handlers)
+	   inhibit-file-name-handlers)))
+    (write-region start end filename append visit lockname)))
+
+(defun mm-image-load-path (&optional package)
+  (let (dir result)
+    (dolist (path load-path (nreverse result))
+      (if (file-directory-p
+	   (setq dir (concat (file-name-directory
+			      (directory-file-name path))
+			     "etc/" (or package "gnus/"))))
+	  (push dir result))
+      (push path result))))
 
 (provide 'mm-util)