;;; Code:
(require 'emu)
+(require 'mime-def)
;;; @ variables
;;;
-(defvar base64-external-encoder '("mmencode")
- "*list of base64 encoder program name and its arguments.")
+(defgroup base64 nil
+ "Base64 encoder/decoder"
+ :group 'mime)
-(defvar base64-external-decoder '("mmencode" "-u")
- "*list of base64 decoder program name and its arguments.")
+(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)))
-(defvar base64-external-decoder-option-to-specify-file '("-o")
- "*list of options of base64 decoder program to specify file.")
+(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)))
-(defvar base64-internal-encoding-limit 1000
+(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.")
-
-(defvar base64-internal-decoding-limit 1000
+external encoder is called."
+ :group 'base64
+ :type '(choice (const :tag "Always use internal encoder" nil)
+ (integer :tag "Size")))
+
+(defcustom base64-internal-decoding-limit (if (and (featurep 'xemacs)
+ (featurep 'mule))
+ 1000
+ 7600)
"*limit size to use internal base64 decoder.
If size of input to decode is larger than this limit,
-external decoder is called.")
+external decoder is called."
+ :group 'base64
+ :type '(choice (const :tag "Always use internal decoder" nil)
+ (integer :tag "Size")))
-;;; @ internal base64 decoder/encoder
+;;; @ internal base64 encoder
;;; based on base64 decoder by Enami Tsugutomo
-;;; @@ convert from/to base64 char
-;;;
+(eval-and-compile
+ (defconst base64-characters
+ "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/")
+ )
-(defun base64-num-to-char (n)
- (cond ((eq n nil) ?=)
- ((< n 26) (+ ?A n))
- ((< n 52) (+ ?a (- n 26)))
- ((< n 62) (+ ?0 (- n 52)))
- ((= n 62) ?+)
- ((= n 63) ?/)
- (t (error "not a base64 integer %d" n))))
-
-(defun base64-char-to-num (c)
- (cond ((and (<= ?A c) (<= c ?Z)) (- c ?A))
- ((and (<= ?a c) (<= c ?z)) (+ (- c ?a) 26))
- ((and (<= ?0 c) (<= c ?9)) (+ (- c ?0) 52))
- ((= c ?+) 62)
- ((= c ?/) 63)
- ((= c ?=) nil)
- (t (error "not a base64 character %c" c))))
-
-
-;;; @@ encode/decode one base64 unit
-;;;
+(defmacro base64-num-to-char (n)
+ `(aref base64-characters ,n))
(defun base64-encode-1 (pack)
(let ((a (car pack))
(base64-num-to-char (ash (logand a 3) 4))) "==")
))))
-(defun base64-decode-unit (a b &optional c d)
- (condition-case err
- (concat
- (char-to-string (logior (ash (base64-char-to-num a) 2)
- (ash (setq b (base64-char-to-num b)) -4)))
- (if (and c (setq c (base64-char-to-num c)))
- (concat (char-to-string
- (logior (ash (logand b 15) 4) (ash c -2)))
- (if (and d (setq d (base64-char-to-num d)))
- (char-to-string (logior (ash (logand c 3) 6) d))
- ))))
- (error (message (nth 1 err))
- "")))
-
-
-;;; @@ base64 encoder/decoder for string
-;;;
-
(defun base64-encode-string (string)
"Encode STRING to base64, and return the result."
(let ((len (length string))
))
)))
-(defun base64-internal-decode-string (string)
- "Decode STRING which is encoded in base64, and return the result."
- (let ((len (length string))
- (i 0)
- dest)
- (while (< i len)
- (let ((a (aref string i)))
- (setq i (1+ i))
- (unless (eq a ?\n)
- (let ((b (aref string i)))
- (setq i (1+ i))
- (cond
- ((eq b ?\n)
- ;; invalid
- )
- ((>= i len)
- (setq dest (concat dest (base64-decode-unit a b) ))
- )
- (t
- (let ((c (aref string i)))
- (setq i (1+ i))
- (cond
- ((eq c ?\n)
- (setq dest (concat dest (base64-decode-unit a b)))
- )
- ((>= i len)
- (setq dest (concat dest (base64-decode-unit a b c)))
- )
- (t
- (let ((d (aref string i)))
- (setq i (1+ i))
- (setq dest
- (concat dest
- (if (eq c ?\n)
- (base64-decode-unit a b c)
- (base64-decode-unit a b c d))))
- ))))))))))
- dest))
-
-(defalias 'base64-decode-string 'base64-internal-decode-string)
-
-
-;;; @ base64 encoder/decoder for region
-;;;
-
(defun base64-internal-encode-region (beg end)
(save-excursion
(save-restriction
)
)))
+
+;;; @ internal base64 decoder
+;;;
+
+(defconst base64-numbers
+ (eval-when-compile
+ (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)
+;; (setq string (string-as-unibyte string))
+;; (base64-internal-decode string string))
+
(defun base64-internal-decode-region (beg end)
(save-excursion
- (let ((str (buffer-substring beg end)))
+ (let ((str (string-as-unibyte (buffer-substring beg end))))
(delete-region beg end)
(goto-char beg)
- (insert (base64-internal-decode-string str)))))
+ (insert (base64-internal-decode str str)))))
+
+;; (defun base64-internal-decode-region2 (beg end)
+;; (save-excursion
+;; (let ((str (buffer-substring beg end)))
+;; (delete-region beg end)
+;; (goto-char beg)
+;; (insert (base64-decode-string! str)))))
+
+;; (defun base64-internal-decode-region3 (beg end)
+;; (save-excursion
+;; (let ((str (buffer-substring beg end)))
+;; (delete-region beg end)
+;; (goto-char beg)
+;; (insert (base64-internal-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))
- )
+ (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 "")
- )
+ (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))
- )))
+ (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.
(if (and base64-internal-encoding-limit
(> (- end start) base64-internal-encoding-limit))
(base64-external-encode-region start end)
- (base64-internal-encode-region start end)
- ))
+ (base64-internal-encode-region start end)))
(defun base64-decode-region (start end)
"Decode current region by base64.
(if (and base64-internal-decoding-limit
(> (- end start) base64-internal-decoding-limit))
(base64-external-decode-region start end)
- (base64-internal-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)))
-;;; @ base64 encoder/decoder for file
-;;;
+(mel-define-method-function (mime-encode-string string (nil "base64"))
+ 'base64-encode-string)
+(mel-define-method-function (mime-decode-string string (nil "base64"))
+ 'base64-decode-string)
+(mel-define-method-function (mime-encode-region start end (nil "base64"))
+ 'base64-encode-region)
+(mel-define-method-function (mime-decode-region start end (nil "base64"))
+ 'base64-decode-region)
+
+(mel-define-method-function (encoded-text-encode-string string (nil "B"))
+ 'base64-encode-string)
+
+(mel-define-method encoded-text-decode-string (string (nil "B"))
+ (if (and (string-match B-encoded-text-regexp string)
+ (string= string (match-string 0 string)))
+ (base64-decode-string string)
+ (error "Invalid encoded-text %s" string)))
(defun base64-insert-encoded-file (filename)
"Encode contents of file FILENAME to base64, and insert the result.
`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: ")))
- (apply (function call-process) (car base64-external-encoder)
- filename t nil (cdr base64-external-encoder))
- )
+ (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
+ (set-buffer-multibyte nil)
+ (insert-file-contents-as-binary filename)
+ (buffer-string))))
+ (or (bolp)
+ (insert "\n"))
+ ))
+
+(mel-define-method-function (mime-insert-encoded-file filename (nil "base64"))
+ 'base64-insert-encoded-file)
(defun base64-write-decoded-region (start end filename)
"Decode and write current region encoded by base64 into FILENAME.
(interactive
(list (region-beginning) (region-end)
(read-file-name "Write decoded region to file: ")))
- (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))
- )))
-
-
+ (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)
+ ))))
+
+(mel-define-method-function
+ (mime-write-decoded-region start end filename (nil "base64"))
+ 'base64-write-decoded-region)
+
+
;;; @ etc
;;;
-(defun base64-encoded-length (string)
- (let ((len (length string)))
- (* (+ (/ len 3)
- (if (= (mod len 3) 0) 0 1)
- ) 4)
- ))
-
(defun pack-sequence (seq size)
"Split sequence SEQ into SIZE elements packs,
and return list of packs. [mel-b; tl-seq function]"
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