From 3f76edebc13080b6006c35524edfa33d7a92a2e9 Mon Sep 17 00:00:00 2001
From: morioka <morioka>
Date: Thu, 17 Sep 1998 03:29:34 +0000
Subject: [PATCH] Split into mel-b-el.el.

---
 mel-b.el |  345 ++++----------------------------------------------------------
 1 file changed, 19 insertions(+), 326 deletions(-)

diff --git a/mel-b.el b/mel-b.el
index ae5472a..8b9e763 100644
--- a/mel-b.el
+++ b/mel-b.el
@@ -1,13 +1,11 @@
 ;;; mel-b.el: Base64 encoder/decoder for GNU Emacs
 
-;; Copyright (C) 1992,1995,1996,1997,1998 Free Software Foundation, Inc.
+;; Copyright (C) 1998 Free Software Foundation, Inc.
 
-;; Author: ENAMI Tsugutomo <enami@sys.ptg.sony.co.jp>
-;;         MORIOKA Tomohiko <morioka@jaist.ac.jp>
-;; Created: 1995/6/24
+;; Author: MORIOKA Tomohiko <morioka@jaist.ac.jp>
 ;; Keywords: MIME, Base64
 
-;; This file is part of MEL (MIME Encoding Library).
+;; This file is part of FLIM (Faithful Library about Internet Message).
 
 ;; This program is free software; you can redistribute it and/or
 ;; modify it under the terms of the GNU General Public License as
@@ -26,307 +24,26 @@
 
 ;;; Code:
 
-(require 'emu)
-(require 'mime-def)
+(defvar base64-dl-module
+  (and (fboundp 'dynamic-link)
+       (let ((path (expand-file-name "base64.so" exec-directory)))
+	 (and (file-exists-p path)
+	      path))))
 
 
-;;; @ variables
+;;; @ implementations
 ;;;
 
-(defgroup base64 nil
-  "Base64 encoder/decoder"
-  :group 'mime)
-
-(defcustom base64-external-encoder '("mmencode")
-  "*list of base64 encoder program name and its arguments."
-  :group 'base64
-  :type '(cons (file :tag "Command")(repeat :tag "Arguments" string)))
-
-(defcustom base64-external-decoder '("mmencode" "-u")
-  "*list of base64 decoder program name and its arguments."
-  :group 'base64
-  :type '(cons (file :tag "Command")(repeat :tag "Arguments" string)))
-
-(defcustom base64-external-decoder-option-to-specify-file '("-o")
-  "*list of options of base64 decoder program to specify file."
-  :group 'base64
-  :type '(repeat :tag "Arguments" string))
-
-(defcustom base64-internal-encoding-limit 1000
-  "*limit size to use internal base64 encoder.
-If size of input to encode is larger than this limit,
-external encoder is called."
-  :group 'base64
-  :type '(choice (const :tag "Always use internal encoder" nil)
-		 (integer :tag "Size")))
-
-(defcustom base64-internal-decoding-limit 70000
-  "*limit size to use internal base64 decoder.
-If size of input to decode is larger than this limit,
-external decoder is called."
-  :group 'base64
-  :type '(choice (const :tag "Always use internal decoder" nil)
-		 (integer :tag "Size")))
-
-
-;;; @ internal base64 encoder
-;;;	based on base64 decoder by Enami Tsugutomo
-
-(defconst base64-characters
-  "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/")
-
-(defmacro base64-num-to-char (n)
-  `(aref base64-characters ,n))
-
-(defun base64-encode-1 (pack)
-  (let ((a (car pack))
-	(b (nth 1 pack))
-	(c (nth 2 pack)))
-    (concat
-     (char-to-string (base64-num-to-char (ash a -2)))
-     (if b
-	 (concat
-	  (char-to-string
-	   (base64-num-to-char (logior (ash (logand a 3) 4) (ash b -4))))
-	  (if c
-	      (concat
-	       (char-to-string
-		(base64-num-to-char (logior (ash (logand b 15) 2) (ash c -6))))
-	       (char-to-string (base64-num-to-char (logand c 63)))
-	       )
-	    (concat (char-to-string
-		     (base64-num-to-char (ash (logand b 15) 2))) "=")
-	    ))
-       (concat (char-to-string
-		(base64-num-to-char (ash (logand a 3) 4))) "==")
-       ))))
-
-(defun base64-encode-string (string)
-  "Encode STRING to base64, and return the result."
-  (let ((len (length string))
-	(b 0)(e 57)
-	dest)
-    (while (< e len)
-      (setq dest
-	    (concat dest
-		    (mapconcat
-		     (function base64-encode-1)
-		     (pack-sequence (substring string b e) 3)
-		     "")
-		    "\n"))
-      (setq b e
-	    e (+ e 57)
-	    )
-      )
-    (let* ((es (mapconcat
-		(function base64-encode-1)
-		(pack-sequence (substring string b) 3)
-		""))
-	   (m (mod (length es) 4))
-	   )
-      (concat dest es (cond ((= m 3) "=")
-			    ((= m 2) "==")
-			    ))
-      )))
-
-(defun base64-internal-encode-region (beg end)
-  (save-excursion
-    (save-restriction
-      (narrow-to-region beg end)
-      (let ((str (buffer-substring beg end)))
-	(delete-region beg end)
-	(insert (base64-encode-string str))
-	)
-      (or (bolp)
-	  (insert "\n")
-	  )
-      )))
-
-
-;;; @ internal base64 decoder
-;;;
-
-(defconst base64-numbers
-  `,(let ((len (length base64-characters))
-	  (vec (make-vector 123 nil))
-	  (i 0))
-      (while (< i len)
-	(aset vec (aref base64-characters i) i)
-	(setq i (1+ i)))
-      vec))
-
-(defmacro base64-char-to-num (c)
-  `(aref base64-numbers ,c))
-
-(defsubst base64-internal-decode (string buffer)
-  (let* ((len (length string))
-	 (i 0)
-	 (j 0)
-	 v1 v2 v3)
-    (catch 'tag
-      (while (< i len)
-	(when (prog1 (setq v1 (base64-char-to-num (aref string i)))
-		(setq i (1+ i)))
-	  (setq v2 (base64-char-to-num (aref string i))
-		i (1+ i)
-		v3 (base64-char-to-num (aref string i))
-		i (1+ i))
-	  (aset buffer j (logior (lsh v1 2)(lsh v2 -4)))
-	  (setq j (1+ j))
-	  (if v3
-	      (let ((v4 (base64-char-to-num (aref string i))))
-		(setq i (1+ i))
-		(aset buffer j (logior (lsh (logand v2 15) 4)(lsh v3 -2)))
-		(setq j (1+ j))
-		(if v4
-		    (aset buffer (prog1 j (setq j (1+ j)))
-			  (logior (lsh (logand v3 3) 6) v4))
-		  (throw 'tag nil)
-		  ))
-	    (throw 'tag nil)
-	    ))))
-    (substring buffer 0 j)
-    ))
-
-(defun base64-internal-decode-string (string)
-  (base64-internal-decode string (make-string (length string) 0)))
-
-(defsubst base64-decode-string! (string)
-  (base64-internal-decode string string))
-
-(defun base64-internal-decode-region (beg end)
-  (save-excursion
-    (let ((str (buffer-substring beg end)))
-      (delete-region beg end)
-      (goto-char beg)
-      (insert (base64-decode-string! str)))))
-
-
-;;; @ external encoder/decoder
-;;;
-
-(defun base64-external-encode-region (beg end)
-  (save-excursion
-    (save-restriction
-      (narrow-to-region beg end)
-      (as-binary-process
-       (apply (function call-process-region)
-	      beg end (car base64-external-encoder)
-	      t t nil (cdr base64-external-encoder)))
-      ;; for OS/2
-      ;;   regularize line break code
-      (goto-char (point-min))
-      (while (re-search-forward "\r$" nil t)
-	(replace-match ""))
-      )))
-
-(defun base64-external-decode-region (beg end)
-  (save-excursion
-    (as-binary-process
-     (apply (function call-process-region)
-	    beg end (car base64-external-decoder)
-	    t t nil (cdr base64-external-decoder)))
-    ))
-
-(defun base64-external-decode-string (string)
-  (with-temp-buffer
-    (insert string)
-    (as-binary-process
-     (apply (function call-process-region)
-	    (point-min) (point-max)
-	    (car base64-external-decoder)
-	    t t nil (cdr base64-external-decoder)))
-    (buffer-string)))
-
-
-;;; @ application interfaces
-;;;
-
-(defun base64-encode-region (start end)
-  "Encode current region by base64.
-START and END are buffer positions.
-This function calls internal base64 encoder if size of region is
-smaller than `base64-internal-encoding-limit', otherwise it calls
-external base64 encoder specified by `base64-external-encoder'.  In
-this case, you must install the program (maybe mmencode included in
-metamail or XEmacs package)."
-  (interactive "r")
-  (if (and base64-internal-encoding-limit
-	   (> (- end start) base64-internal-encoding-limit))
-      (base64-external-encode-region start end)
-    (base64-internal-encode-region start end)))
-
-(defun base64-decode-region (start end)
-  "Decode current region by base64.
-START and END are buffer positions.
-This function calls internal base64 decoder if size of region is
-smaller than `base64-internal-decoding-limit', otherwise it calls
-external base64 decoder specified by `base64-external-decoder'.  In
-this case, you must install the program (maybe mmencode included in
-metamail or XEmacs package)."
-  (interactive "r")
-  (if (and base64-internal-decoding-limit
-	   (> (- end start) base64-internal-decoding-limit))
-      (base64-external-decode-region start end)
-    (base64-internal-decode-region start end)))
-
-(defun base64-decode-string (string)
-  "Decode STRING which is encoded in base64, and return the result.
-This function calls internal base64 decoder if size of STRING is
-smaller than `base64-internal-decoding-limit', otherwise it calls
-external base64 decoder specified by `base64-external-decoder'.  In
-this case, you must install the program (maybe mmencode included in
-metamail or XEmacs package)."
-  (interactive "r")
-  (if (and base64-internal-decoding-limit
-	   (> (length string) base64-internal-decoding-limit))
-      (base64-external-decode-string string)
-    (base64-internal-decode-string string)))
-
-
-(defun base64-insert-encoded-file (filename)
-  "Encode contents of file FILENAME to base64, and insert the result.
-It calls external base64 encoder specified by
-`base64-external-encoder'.  So you must install the program (maybe
-mmencode included in metamail or XEmacs package)."
-  (interactive (list (read-file-name "Insert encoded file: ")))
-  (if (and base64-internal-encoding-limit
-	   (> (nth 7 (file-attributes filename))
-	      base64-internal-encoding-limit))
-      (apply (function call-process) (car base64-external-encoder)
-	     filename t nil (cdr base64-external-encoder))
-    (insert
-     (base64-encode-string
-      (with-temp-buffer
-	(insert-file-contents-as-binary filename)
-	(buffer-string))))
-    (or (bolp)
-	(insert "\n"))
-     ))
-
-(defun base64-write-decoded-region (start end filename)
-  "Decode and write current region encoded by base64 into FILENAME.
-START and END are buffer positions."
-  (interactive
-   (list (region-beginning) (region-end)
-	 (read-file-name "Write decoded region to file: ")))
-  (if (and base64-internal-decoding-limit
-	   (> (- end start) base64-internal-decoding-limit))
-      (as-binary-process
-       (apply (function call-process-region)
-	      start end (car base64-external-decoder)
-	      nil nil nil
-	      (append (cdr base64-external-decoder)
-		      base64-external-decoder-option-to-specify-file
-		      (list filename))))
-    (let ((str (buffer-substring start end)))
-      (with-temp-buffer
-	(insert (base64-internal-decode-string str))
-	(write-region-as-binary (point-min) (point-max) filename)))))
-
-       
-;;; @ etc
-;;;
+(cond (base64-dl-module
+       (require 'mel-b-dl)
+       )
+      ((and (featurep 'mule)
+	    (not (featurep 'xemacs)))
+       (require 'mel-b-ccl)
+       )
+      (t
+       (require 'mel-b-el)
+       ))
 
 (defun base64-encoded-length (string)
   (let ((len (length string)))
@@ -335,30 +52,6 @@ START and END are buffer positions."
 	  ) 4)
     ))
 
-(defun pack-sequence (seq size)
-  "Split sequence SEQ into SIZE elements packs,
-and return list of packs. [mel-b; tl-seq function]"
-  (let ((len (length seq)) (p 0) obj
-	unit (i 0)
-	dest)
-    (while (< p len)
-      (setq obj (elt seq p))
-      (setq unit (cons obj unit))
-      (setq i (1+ i))
-      (if (= i size)
-	  (progn
-	    (setq dest (cons (reverse unit) dest))
-	    (setq unit nil)
-	    (setq i 0)
-	    ))
-      (setq p (1+ p))
-      )
-    (if unit
-	(setq dest (cons (reverse unit) dest))
-      )
-    (reverse dest)
-    ))
-
 
 ;;; @ end
 ;;;
-- 
1.7.10.4