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23f87bede0
Merge from emacs--gnus--5.10, gnus--rel--5.10 Patches applied: * miles@gnu.org--gnu-2004/emacs--gnus--5.10--base-0 tag of miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-464 * miles@gnu.org--gnu-2004/emacs--gnus--5.10--patch-1 Import from CVS branch gnus-5_10-branch * miles@gnu.org--gnu-2004/emacs--gnus--5.10--patch-2 Merge from lorentey@elte.hu--2004/emacs--multi-tty--0, emacs--cvs-trunk--0 * miles@gnu.org--gnu-2004/emacs--gnus--5.10--patch-3 Merge from gnus--rel--5.10 * miles@gnu.org--gnu-2004/emacs--gnus--5.10--patch-4 Merge from gnus--rel--5.10 * miles@gnu.org--gnu-2004/gnus--rel--5.10--patch-18 Update from CVS * miles@gnu.org--gnu-2004/gnus--rel--5.10--patch-19 Remove autoconf-generated files from archive * miles@gnu.org--gnu-2004/gnus--rel--5.10--patch-20 Update from CVS
329 lines
12 KiB
EmacsLisp
329 lines
12 KiB
EmacsLisp
;;; binhex.el --- elisp native binhex decode
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;; Copyright (c) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
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;; Author: Shenghuo Zhu <zsh@cs.rochester.edu>
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;; Keywords: binhex news
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2, or (at your option)
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;; any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;;; Commentary:
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;;; Code:
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(autoload 'executable-find "executable")
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(eval-when-compile (require 'cl))
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(eval-and-compile
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(defalias 'binhex-char-int
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(if (fboundp 'char-int)
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'char-int
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'identity)))
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(defcustom binhex-decoder-program "hexbin"
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"*Non-nil value should be a string that names a binhex decoder.
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The program should expect to read binhex data on its standard
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input and write the converted data to its standard output."
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:type 'string
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:group 'gnus-extract)
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(defcustom binhex-decoder-switches '("-d")
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"*List of command line flags passed to the command `binhex-decoder-program'."
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:group 'gnus-extract
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:type '(repeat string))
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(defcustom binhex-use-external
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(executable-find binhex-decoder-program)
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"*Use external binhex program."
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:group 'gnus-extract
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:type 'boolean)
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(defconst binhex-alphabet-decoding-alist
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'(( ?\! . 0) ( ?\" . 1) ( ?\# . 2) ( ?\$ . 3) ( ?\% . 4) ( ?\& . 5)
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( ?\' . 6) ( ?\( . 7) ( ?\) . 8) ( ?\* . 9) ( ?\+ . 10) ( ?\, . 11)
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( ?\- . 12) ( ?0 . 13) ( ?1 . 14) ( ?2 . 15) ( ?3 . 16) ( ?4 . 17)
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( ?5 . 18) ( ?6 . 19) ( ?8 . 20) ( ?9 . 21) ( ?@ . 22) ( ?A . 23)
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( ?B . 24) ( ?C . 25) ( ?D . 26) ( ?E . 27) ( ?F . 28) ( ?G . 29)
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( ?H . 30) ( ?I . 31) ( ?J . 32) ( ?K . 33) ( ?L . 34) ( ?M . 35)
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( ?N . 36) ( ?P . 37) ( ?Q . 38) ( ?R . 39) ( ?S . 40) ( ?T . 41)
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( ?U . 42) ( ?V . 43) ( ?X . 44) ( ?Y . 45) ( ?Z . 46) ( ?\[ . 47)
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( ?\` . 48) ( ?a . 49) ( ?b . 50) ( ?c . 51) ( ?d . 52) ( ?e . 53)
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( ?f . 54) ( ?h . 55) ( ?i . 56) ( ?j . 57) ( ?k . 58) ( ?l . 59)
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( ?m . 60) ( ?p . 61) ( ?q . 62) ( ?r . 63)))
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(defun binhex-char-map (char)
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(cdr (assq char binhex-alphabet-decoding-alist)))
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;;;###autoload
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(defconst binhex-begin-line
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"^:...............................................................$")
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(defconst binhex-body-line
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"^[^:]...............................................................$")
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(defconst binhex-end-line ":$")
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(defvar binhex-temporary-file-directory
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(cond ((fboundp 'temp-directory) (temp-directory))
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((boundp 'temporary-file-directory) temporary-file-directory)
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("/tmp/")))
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(eval-and-compile
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(defalias 'binhex-insert-char
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(if (featurep 'xemacs)
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'insert-char
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(lambda (char &optional count ignored buffer)
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"Insert COUNT copies of CHARACTER into BUFFER."
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(if (or (null buffer) (eq buffer (current-buffer)))
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(insert-char char count)
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(with-current-buffer buffer
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(insert-char char count)))))))
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(defvar binhex-crc-table
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[0 4129 8258 12387 16516 20645 24774 28903
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33032 37161 41290 45419 49548 53677 57806 61935
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4657 528 12915 8786 21173 17044 29431 25302
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37689 33560 45947 41818 54205 50076 62463 58334
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9314 13379 1056 5121 25830 29895 17572 21637
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42346 46411 34088 38153 58862 62927 50604 54669
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13907 9842 5649 1584 30423 26358 22165 18100
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46939 42874 38681 34616 63455 59390 55197 51132
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18628 22757 26758 30887 2112 6241 10242 14371
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51660 55789 59790 63919 35144 39273 43274 47403
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23285 19156 31415 27286 6769 2640 14899 10770
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56317 52188 64447 60318 39801 35672 47931 43802
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27814 31879 19684 23749 11298 15363 3168 7233
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60846 64911 52716 56781 44330 48395 36200 40265
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32407 28342 24277 20212 15891 11826 7761 3696
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65439 61374 57309 53244 48923 44858 40793 36728
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37256 33193 45514 41451 53516 49453 61774 57711
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4224 161 12482 8419 20484 16421 28742 24679
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33721 37784 41979 46042 49981 54044 58239 62302
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689 4752 8947 13010 16949 21012 25207 29270
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46570 42443 38312 34185 62830 58703 54572 50445
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13538 9411 5280 1153 29798 25671 21540 17413
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42971 47098 34713 38840 59231 63358 50973 55100
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9939 14066 1681 5808 26199 30326 17941 22068
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55628 51565 63758 59695 39368 35305 47498 43435
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22596 18533 30726 26663 6336 2273 14466 10403
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52093 56156 60223 64286 35833 39896 43963 48026
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19061 23124 27191 31254 2801 6864 10931 14994
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64814 60687 56684 52557 48554 44427 40424 36297
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31782 27655 23652 19525 15522 11395 7392 3265
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61215 65342 53085 57212 44955 49082 36825 40952
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28183 32310 20053 24180 11923 16050 3793 7920])
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(defun binhex-update-crc (crc char &optional count)
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(if (null count) (setq count 1))
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(while (> count 0)
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(setq crc (logxor (logand (lsh crc 8) 65280)
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(aref binhex-crc-table
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(logxor (logand (lsh crc -8) 255)
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char)))
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count (1- count)))
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crc)
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(defun binhex-verify-crc (buffer start end)
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(with-current-buffer buffer
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(let ((pos start) (crc 0) (last (- end 2)))
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(while (< pos last)
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(setq crc (binhex-update-crc crc (char-after pos))
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pos (1+ pos)))
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(if (= crc (binhex-string-big-endian (buffer-substring last end)))
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nil
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(error "CRC error")))))
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(defun binhex-string-big-endian (string)
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(let ((ret 0) (i 0) (len (length string)))
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(while (< i len)
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(setq ret (+ (lsh ret 8) (binhex-char-int (aref string i)))
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i (1+ i)))
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ret))
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(defun binhex-string-little-endian (string)
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(let ((ret 0) (i 0) (shift 0) (len (length string)))
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(while (< i len)
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(setq ret (+ ret (lsh (binhex-char-int (aref string i)) shift))
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i (1+ i)
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shift (+ shift 8)))
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ret))
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(defun binhex-header (buffer)
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(with-current-buffer buffer
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(let ((pos (point-min)) len)
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(vector
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(prog1
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(setq len (binhex-char-int (char-after pos)))
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(setq pos (1+ pos)))
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(buffer-substring pos (setq pos (+ pos len)))
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(prog1
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(setq len (binhex-char-int (char-after pos)))
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(setq pos (1+ pos)))
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(buffer-substring pos (setq pos (+ pos 4)))
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(buffer-substring pos (setq pos (+ pos 4)))
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(binhex-string-big-endian
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(buffer-substring pos (setq pos (+ pos 2))))
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(binhex-string-big-endian
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(buffer-substring pos (setq pos (+ pos 4))))
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(binhex-string-big-endian
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(buffer-substring pos (setq pos (+ pos 4))))))))
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(defvar binhex-last-char)
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(defvar binhex-repeat)
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(defun binhex-push-char (char &optional count ignored buffer)
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(cond
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(binhex-repeat
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(if (eq char 0)
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(binhex-insert-char (setq binhex-last-char 144) 1
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ignored buffer)
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(binhex-insert-char binhex-last-char (- char 1)
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ignored buffer)
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(setq binhex-last-char nil))
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(setq binhex-repeat nil))
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((= char 144)
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(setq binhex-repeat t))
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(t
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(binhex-insert-char (setq binhex-last-char char) 1 ignored buffer))))
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;;;###autoload
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(defun binhex-decode-region-internal (start end &optional header-only)
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"Binhex decode region between START and END without using an external program.
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If HEADER-ONLY is non-nil only decode header and return filename."
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(interactive "r")
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(let ((work-buffer nil)
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(counter 0)
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(bits 0) (tmp t)
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(lim 0) inputpos
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(non-data-chars " \t\n\r:")
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file-name-length data-fork-start
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header
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binhex-last-char binhex-repeat)
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(unwind-protect
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(save-excursion
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(goto-char start)
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(when (re-search-forward binhex-begin-line end t)
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(let (default-enable-multibyte-characters)
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(setq work-buffer (generate-new-buffer " *binhex-work*")))
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(beginning-of-line)
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(setq bits 0 counter 0)
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(while tmp
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(skip-chars-forward non-data-chars end)
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(setq inputpos (point))
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(end-of-line)
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(setq lim (point))
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(while (and (< inputpos lim)
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(setq tmp (binhex-char-map (char-after inputpos))))
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(setq bits (+ bits tmp)
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counter (1+ counter)
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inputpos (1+ inputpos))
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(cond ((= counter 4)
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(binhex-push-char (lsh bits -16) 1 nil work-buffer)
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(binhex-push-char (logand (lsh bits -8) 255) 1 nil
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work-buffer)
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(binhex-push-char (logand bits 255) 1 nil
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work-buffer)
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(setq bits 0 counter 0))
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(t (setq bits (lsh bits 6)))))
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(if (null file-name-length)
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(with-current-buffer work-buffer
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(setq file-name-length (char-after (point-min))
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data-fork-start (+ (point-min)
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file-name-length 22))))
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(if (and (null header)
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(with-current-buffer work-buffer
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(>= (buffer-size) data-fork-start)))
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(progn
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(binhex-verify-crc work-buffer
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(point-min) data-fork-start)
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(setq header (binhex-header work-buffer))
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(if header-only (setq tmp nil counter 0))))
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(setq tmp (and tmp (not (eq inputpos end)))))
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(cond
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((= counter 3)
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(binhex-push-char (logand (lsh bits -16) 255) 1 nil
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work-buffer)
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(binhex-push-char (logand (lsh bits -8) 255) 1 nil
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work-buffer))
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((= counter 2)
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(binhex-push-char (logand (lsh bits -10) 255) 1 nil
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work-buffer))))
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(if header-only nil
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(binhex-verify-crc work-buffer
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data-fork-start
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(+ data-fork-start (aref header 6) 2))
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(or (markerp end) (setq end (set-marker (make-marker) end)))
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(goto-char start)
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(insert-buffer-substring work-buffer
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data-fork-start (+ data-fork-start
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(aref header 6)))
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(delete-region (point) end)))
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(and work-buffer (kill-buffer work-buffer)))
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(if header (aref header 1))))
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;;;###autoload
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(defun binhex-decode-region-external (start end)
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"Binhex decode region between START and END using external decoder."
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(interactive "r")
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(let ((cbuf (current-buffer)) firstline work-buffer status
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(file-name (expand-file-name
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(concat (binhex-decode-region-internal start end t)
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".data")
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binhex-temporary-file-directory)))
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(save-excursion
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(goto-char start)
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(when (re-search-forward binhex-begin-line nil t)
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(let ((cdir default-directory) default-process-coding-system)
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(unwind-protect
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(progn
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(set-buffer (setq work-buffer
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(generate-new-buffer " *binhex-work*")))
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(buffer-disable-undo work-buffer)
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(insert-buffer-substring cbuf firstline end)
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(cd binhex-temporary-file-directory)
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(apply 'call-process-region
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(point-min)
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(point-max)
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binhex-decoder-program
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nil
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nil
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nil
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binhex-decoder-switches))
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(cd cdir) (set-buffer cbuf)))
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(if (and file-name (file-exists-p file-name))
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(progn
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(goto-char start)
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(delete-region start end)
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(let (format-alist)
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(insert-file-contents-literally file-name)))
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(error "Can not binhex")))
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(and work-buffer (kill-buffer work-buffer))
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(ignore-errors
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(if file-name (delete-file file-name))))))
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;;;###autoload
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(defun binhex-decode-region (start end)
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"Binhex decode region between START and END."
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(interactive "r")
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(if binhex-use-external
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(binhex-decode-region-external start end)
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(binhex-decode-region-internal start end)))
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(provide 'binhex)
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;;; arch-tag: 8476badd-1e76-4f1d-a640-f9a38c72eed8
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;;; binhex.el ends here
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