(require 'mm-util)
(eval-when-compile (defvar mm-use-ultra-safe-encoding))
(defun quoted-printable-decode-region (from to &optional coding-system)
"Decode quoted-printable in the region between FROM and TO, per RFC 2045.
If CODING-SYSTEM is non-nil, decode bytes into characters with that
coding-system.
Interactively, you can supply the CODING-SYSTEM argument
with \\[universal-coding-system-argument].
The CODING-SYSTEM argument is a historical hangover and is deprecated.
QP encodes raw bytes and should be decoded into raw bytes. Decoding
them into characters should be done separately."
(interactive
(list (region-beginning) (region-end) coding-system-for-read))
(unless (mm-coding-system-p coding-system) (setq coding-system nil))
(save-excursion
(save-restriction
(let ((case-fold-search t))
(narrow-to-region from to)
(if coding-system
(mm-encode-coding-region (point-min) (point-max) coding-system))
(goto-char (point-min))
(while (and (skip-chars-forward "^=")
(not (eobp)))
(cond ((eq (char-after (1+ (point))) ?\n)
(delete-char 2))
((looking-at "=[0-9A-F][0-9A-F]")
(let ((byte (string-to-number (buffer-substring (1+ (point))
(+ 3 (point)))
16)))
(mm-insert-byte byte 1)
(delete-char 3)))
(t
(message "Malformed quoted-printable text")
(forward-char)))))
(if coding-system
(mm-decode-coding-region (point-min) (point-max) coding-system)))))
(defun quoted-printable-decode-string (string &optional coding-system)
"Decode the quoted-printable encoded STRING and return the result.
If CODING-SYSTEM is non-nil, decode the region with coding-system.
Use of CODING-SYSTEM is deprecated; this function should deal with
raw bytes, and coding conversion should be done separately."
(mm-with-unibyte-buffer
(insert string)
(quoted-printable-decode-region (point-min) (point-max) coding-system)
(buffer-string)))
(defun quoted-printable-encode-region (from to &optional fold class)
"Quoted-printable encode the region between FROM and TO per RFC 2045.
If FOLD, fold long lines at 76 characters (as required by the RFC).
If CLASS is non-nil, translate the characters not matched by that
regexp class, which is in the form expected by `skip-chars-forward'.
You should probably avoid non-ASCII characters in this arg.
If `mm-use-ultra-safe-encoding' is set, fold lines unconditionally and
encode lines starting with \"From\"."
(interactive "r")
(unless class
(setq class "\010-\012\014\040-\074\076-\177"))
(save-excursion
(goto-char from)
(if (re-search-forward (mm-string-to-multibyte "[^\x0-\x7f\x80-\xff]")
to t)
(error "Multibyte character in QP encoding region"))
(save-restriction
(narrow-to-region from to)
(goto-char (point-min))
(while (and (skip-chars-forward class)
(not (eobp)))
(insert
(prog1
(format "=%02X" (mm-multibyte-char-to-unibyte (char-after)))
(delete-char 1))))
(goto-char (point-min))
(while (re-search-forward "[ \t]+$" nil t)
(goto-char (match-beginning 0))
(while (not (eolp))
(insert
(prog1
(format "=%02X" (char-after))
(delete-char 1)))))
(let ((mm-use-ultra-safe-encoding
(and (boundp 'mm-use-ultra-safe-encoding)
mm-use-ultra-safe-encoding)))
(when (or fold mm-use-ultra-safe-encoding)
(let ((tab-width 1)) (goto-char (point-min))
(while (not (eobp))
(when mm-use-ultra-safe-encoding
(if (looking-at "From ")
(replace-match "From=20" nil t)
(if (looking-at "-")
(replace-match "=2D" nil t))))
(end-of-line)
(while (> (current-column) 76) (beginning-of-line)
(forward-char 75) (search-backward "=" (- (point) 2) t)
(insert "=\n")
(end-of-line))
(forward-line))))))))
(defun quoted-printable-encode-string (string)
"Encode the STRING as quoted-printable and return the result."
(let ((default-enable-multibyte-characters (mm-multibyte-string-p string)))
(with-temp-buffer
(insert string)
(quoted-printable-encode-region (point-min) (point-max))
(buffer-string))))
(provide 'qp)