1 ;;; binhex.el -- elisp native binhex decode
2 ;; Copyright (c) 1998 by Shenghuo Zhu <zsh@cs.rochester.edu>
4 ;; Author: Shenghuo Zhu <zsh@cs.rochester.edu>
5 ;; Create Date: Oct 1, 1998
7 ;; Time-stamp: <Tue Oct 6 23:48:38 EDT 1998 zsh>
10 ;; This file is not part of GNU Emacs, but the same permissions
13 ;; GNU Emacs is free software; you can redistribute it and/or modify
14 ;; it under the terms of the GNU General Public License as published by
15 ;; the Free Software Foundation; either version 2, or (at your option)
18 ;; GNU Emacs is distributed in the hope that it will be useful,
19 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
20 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 ;; GNU General Public License for more details.
23 ;; You should have received a copy of the GNU General Public License
24 ;; along with GNU Emacs; see the file COPYING. If not, write to the
25 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
26 ;; Boston, MA 02111-1307, USA.
32 (if (not (fboundp 'char-int))
33 (fset 'char-int 'identity))
35 (defvar binhex-decoder-program "hexbin"
36 "*Non-nil value should be a string that names a uu decoder.
37 The program should expect to read binhex data on its standard
38 input and write the converted data to its standard output.")
40 (defvar binhex-decoder-switches '("-d")
41 "*List of command line flags passed to the command named by binhex-decoder-program.")
43 (defconst binhex-alphabet-decoding-alist
44 '(( ?\! . 0) ( ?\" . 1) ( ?\# . 2) ( ?\$ . 3) ( ?\% . 4) ( ?\& . 5)
45 ( ?\' . 6) ( ?\( . 7) ( ?\) . 8) ( ?\* . 9) ( ?\+ . 10) ( ?\, . 11)
46 ( ?\- . 12) ( ?0 . 13) ( ?1 . 14) ( ?2 . 15) ( ?3 . 16) ( ?4 . 17)
47 ( ?5 . 18) ( ?6 . 19) ( ?8 . 20) ( ?9 . 21) ( ?@ . 22) ( ?A . 23)
48 ( ?B . 24) ( ?C . 25) ( ?D . 26) ( ?E . 27) ( ?F . 28) ( ?G . 29)
49 ( ?H . 30) ( ?I . 31) ( ?J . 32) ( ?K . 33) ( ?L . 34) ( ?M . 35)
50 ( ?N . 36) ( ?P . 37) ( ?Q . 38) ( ?R . 39) ( ?S . 40) ( ?T . 41)
51 ( ?U . 42) ( ?V . 43) ( ?X . 44) ( ?Y . 45) ( ?Z . 46) ( ?\[ . 47)
52 ( ?\` . 48) ( ?a . 49) ( ?b . 50) ( ?c . 51) ( ?d . 52) ( ?e . 53)
53 ( ?f . 54) ( ?h . 55) ( ?i . 56) ( ?j . 57) ( ?k . 58) ( ?l . 59)
54 ( ?m . 60) ( ?p . 61) ( ?q . 62) ( ?r . 63)))
56 (defun binhex-char-map (char)
57 (cdr (assq char binhex-alphabet-decoding-alist)))
60 (defconst binhex-begin-line
61 "^:...............................................................$")
62 (defconst binhex-body-line
63 "^[^:]...............................................................$")
64 (defconst binhex-end-line ":$")
66 (defvar binhex-temporary-file-directory "/tmp/")
68 (if (string-match "XEmacs" emacs-version)
69 (defalias 'binhex-insert-char 'insert-char)
70 (defun binhex-insert-char (char &optional count ignored buffer)
71 (if (or (null buffer) (eq buffer (current-buffer)))
72 (insert-char char count)
73 (with-current-buffer buffer
74 (insert-char char count)))))
76 (defvar binhex-crc-table
77 [0 4129 8258 12387 16516 20645 24774 28903
78 33032 37161 41290 45419 49548 53677 57806 61935
79 4657 528 12915 8786 21173 17044 29431 25302
80 37689 33560 45947 41818 54205 50076 62463 58334
81 9314 13379 1056 5121 25830 29895 17572 21637
82 42346 46411 34088 38153 58862 62927 50604 54669
83 13907 9842 5649 1584 30423 26358 22165 18100
84 46939 42874 38681 34616 63455 59390 55197 51132
85 18628 22757 26758 30887 2112 6241 10242 14371
86 51660 55789 59790 63919 35144 39273 43274 47403
87 23285 19156 31415 27286 6769 2640 14899 10770
88 56317 52188 64447 60318 39801 35672 47931 43802
89 27814 31879 19684 23749 11298 15363 3168 7233
90 60846 64911 52716 56781 44330 48395 36200 40265
91 32407 28342 24277 20212 15891 11826 7761 3696
92 65439 61374 57309 53244 48923 44858 40793 36728
93 37256 33193 45514 41451 53516 49453 61774 57711
94 4224 161 12482 8419 20484 16421 28742 24679
95 33721 37784 41979 46042 49981 54044 58239 62302
96 689 4752 8947 13010 16949 21012 25207 29270
97 46570 42443 38312 34185 62830 58703 54572 50445
98 13538 9411 5280 1153 29798 25671 21540 17413
99 42971 47098 34713 38840 59231 63358 50973 55100
100 9939 14066 1681 5808 26199 30326 17941 22068
101 55628 51565 63758 59695 39368 35305 47498 43435
102 22596 18533 30726 26663 6336 2273 14466 10403
103 52093 56156 60223 64286 35833 39896 43963 48026
104 19061 23124 27191 31254 2801 6864 10931 14994
105 64814 60687 56684 52557 48554 44427 40424 36297
106 31782 27655 23652 19525 15522 11395 7392 3265
107 61215 65342 53085 57212 44955 49082 36825 40952
108 28183 32310 20053 24180 11923 16050 3793 7920])
110 (defun binhex-update-crc (crc char &optional count)
111 (if (null count) (setq count 1))
113 (setq crc (logxor (logand (lsh crc 8) 65280)
114 (aref binhex-crc-table
115 (logxor (logand (lsh crc -8) 255)
120 (defun binhex-verify-crc (buffer start end)
121 (with-current-buffer buffer
122 (let ((pos start) (crc 0) (last (- end 2)))
124 (setq crc (binhex-update-crc crc (char-after pos))
126 (if (= crc (binhex-string-big-endian (buffer-substring last end)))
128 (error "CRC error")))))
130 (defun binhex-string-big-endian (string)
131 (let ((ret 0) (i 0) (len (length string)))
133 (setq ret (+ (lsh ret 8) (char-int (aref string i)))
137 (defun binhex-string-little-endian (string)
138 (let ((ret 0) (i 0) (shift 0) (len (length string)))
140 (setq ret (+ ret (lsh (char-int (aref string i)) shift))
145 (defun binhex-header (buffer)
146 (with-current-buffer buffer
147 (let ((pos (point-min)) len)
150 (setq len (char-int (char-after pos)))
152 (buffer-substring pos (setq pos (+ pos len)))
154 (setq len (char-int (char-after pos)))
156 (buffer-substring pos (setq pos (+ pos 4)))
157 (buffer-substring pos (setq pos (+ pos 4)))
158 (binhex-string-big-endian
159 (buffer-substring pos (setq pos (+ pos 2))))
160 (binhex-string-big-endian
161 (buffer-substring pos (setq pos (+ pos 4))))
162 (binhex-string-big-endian
163 (buffer-substring pos (setq pos (+ pos 4))))))))
165 (defvar binhex-last-char)
166 (defvar binhex-repeat)
168 (defun binhex-push-char (char &optional count ignored buffer)
172 (binhex-insert-char (setq binhex-last-char 144) 1
174 (binhex-insert-char binhex-last-char (- char 1)
176 (setq binhex-last-char nil))
177 (setq binhex-repeat nil))
179 (setq binhex-repeat t))
181 (binhex-insert-char (setq binhex-last-char char) 1 ignored buffer))))
183 (defun binhex-decode-region (start end &optional header-only)
184 "Binhex decode region between START and END.
185 If HEADER-ONLY is non-nil only decode header and return filename."
187 (let ((work-buffer nil)
191 (non-data-chars " \t\n\r:")
192 file-name-length data-fork-start
194 binhex-last-char binhex-repeat)
198 (when (re-search-forward binhex-begin-line end t)
199 (if (boundp 'enable-multibyte-characters)
201 (default-value 'enable-multibyte-characters)))
202 (setq-default enable-multibyte-characters nil)
204 (generate-new-buffer " *binhex-work*"))
205 (setq-default enable-multibyte-characters multibyte))
206 (setq work-buffer (generate-new-buffer " *binhex-work*")))
207 (buffer-disable-undo work-buffer)
209 (setq bits 0 counter 0)
211 (skip-chars-forward non-data-chars end)
212 (setq inputpos (point))
215 (while (and (< inputpos lim)
216 (setq tmp (binhex-char-map (char-after inputpos))))
217 (setq bits (+ bits tmp)
219 inputpos (1+ inputpos))
221 (binhex-push-char (lsh bits -16) 1 nil work-buffer)
222 (binhex-push-char (logand (lsh bits -8) 255) 1 nil
224 (binhex-push-char (logand bits 255) 1 nil
226 (setq bits 0 counter 0))
227 (t (setq bits (lsh bits 6)))))
228 (if (null file-name-length)
229 (with-current-buffer work-buffer
230 (setq file-name-length (char-after (point-min))
231 data-fork-start (+ (point-min)
232 file-name-length 22))))
233 (if (and (null header)
234 (with-current-buffer work-buffer
235 (>= (buffer-size) data-fork-start)))
237 (binhex-verify-crc work-buffer
239 (setq header (binhex-header work-buffer))
240 (if header-only (setq tmp nil counter 0))))
241 (setq tmp (and tmp (not (eq inputpos end)))))
244 (binhex-push-char (logand (lsh bits -16) 255) 1 nil
246 (binhex-push-char (logand (lsh bits -8) 255) 1 nil
249 (binhex-push-char (logand (lsh bits -10) 255) 1 nil
252 (binhex-verify-crc work-buffer
254 (+ data-fork-start (aref header 6) 2))
255 (or (markerp end) (setq end (set-marker (make-marker) end)))
257 (insert-buffer-substring work-buffer
258 data-fork-start (+ data-fork-start
260 (delete-region (point) end)))
261 (and work-buffer (kill-buffer work-buffer)))
262 (if header (aref header 1))))
264 (defun binhex-decode-region-external (start end)
265 "Binhex decode region between START and END using external decoder"
267 (let ((cbuf (current-buffer)) firstline work-buffer status
268 (file-name (concat binhex-temporary-file-directory
269 (binhex-decode-region start end t)
273 (when (re-search-forward binhex-begin-line nil t)
274 (let ((cdir default-directory) default-process-coding-system)
277 (set-buffer (setq work-buffer
278 (generate-new-buffer " *binhex-work*")))
279 (buffer-disable-undo work-buffer)
280 (insert-buffer-substring cbuf firstline end)
281 (cd binhex-temporary-file-directory)
282 (apply 'call-process-region
285 binhex-decoder-program
289 binhex-decoder-switches))
290 (cd cdir) (set-buffer cbuf)))
291 (if (and file-name (file-exists-p file-name))
294 (delete-region start end)
296 (insert-file-contents-literally file-name)))
297 (error "Can not binhex")))
298 (and work-buffer (kill-buffer work-buffer))
300 (if file-name (delete-file file-name))
306 ;;; binhex.el ends here