1 ;;; binhex.el --- elisp native binhex decode
2 ;; Copyright (c) 1998, 1999, 2000, 2001, 2002, 2004
3 ;; Free Software Foundation, Inc.
5 ;; Author: Shenghuo Zhu <zsh@cs.rochester.edu>
6 ;; Keywords: binhex news
8 ;; This file is part of GNU Emacs.
10 ;; GNU Emacs is free software; you can redistribute it and/or modify
11 ;; it under the terms of the GNU General Public License as published by
12 ;; the Free Software Foundation; either version 2, or (at your option)
15 ;; GNU Emacs is distributed in the hope that it will be useful,
16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 ;; GNU General Public License for more details.
20 ;; You should have received a copy of the GNU General Public License
21 ;; along with GNU Emacs; see the file COPYING. If not, write to the
22 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
23 ;; Boston, MA 02111-1307, USA.
29 (eval-when-compile (require 'cl))
32 (defalias 'binhex-char-int
33 (if (fboundp 'char-int)
37 (defcustom binhex-decoder-program "hexbin"
38 "*Non-nil value should be a string that names a binhex decoder.
39 The program should expect to read binhex data on its standard
40 input and write the converted data to its standard output."
44 (defcustom binhex-decoder-switches '("-d")
45 "*List of command line flags passed to the command `binhex-decoder-program'."
47 :type '(repeat string))
49 (defcustom binhex-use-external
50 (executable-find binhex-decoder-program)
51 "*Use external binhex program."
55 (defconst binhex-alphabet-decoding-alist
56 '(( ?\! . 0) ( ?\" . 1) ( ?\# . 2) ( ?\$ . 3) ( ?\% . 4) ( ?\& . 5)
57 ( ?\' . 6) ( ?\( . 7) ( ?\) . 8) ( ?\* . 9) ( ?\+ . 10) ( ?\, . 11)
58 ( ?\- . 12) ( ?0 . 13) ( ?1 . 14) ( ?2 . 15) ( ?3 . 16) ( ?4 . 17)
59 ( ?5 . 18) ( ?6 . 19) ( ?8 . 20) ( ?9 . 21) ( ?@ . 22) ( ?A . 23)
60 ( ?B . 24) ( ?C . 25) ( ?D . 26) ( ?E . 27) ( ?F . 28) ( ?G . 29)
61 ( ?H . 30) ( ?I . 31) ( ?J . 32) ( ?K . 33) ( ?L . 34) ( ?M . 35)
62 ( ?N . 36) ( ?P . 37) ( ?Q . 38) ( ?R . 39) ( ?S . 40) ( ?T . 41)
63 ( ?U . 42) ( ?V . 43) ( ?X . 44) ( ?Y . 45) ( ?Z . 46) ( ?\[ . 47)
64 ( ?\` . 48) ( ?a . 49) ( ?b . 50) ( ?c . 51) ( ?d . 52) ( ?e . 53)
65 ( ?f . 54) ( ?h . 55) ( ?i . 56) ( ?j . 57) ( ?k . 58) ( ?l . 59)
66 ( ?m . 60) ( ?p . 61) ( ?q . 62) ( ?r . 63)))
68 (defun binhex-char-map (char)
69 (cdr (assq char binhex-alphabet-decoding-alist)))
72 (defconst binhex-begin-line
73 "^:...............................................................$")
74 (defconst binhex-body-line
75 "^[^:]...............................................................$")
76 (defconst binhex-end-line ":$")
78 (defvar binhex-temporary-file-directory
79 (cond ((fboundp 'temp-directory) (temp-directory))
80 ((boundp 'temporary-file-directory) temporary-file-directory)
84 (defalias 'binhex-insert-char
85 (if (featurep 'xemacs)
87 (lambda (char &optional count ignored buffer)
88 "Insert COUNT copies of CHARACTER into BUFFER."
89 (if (or (null buffer) (eq buffer (current-buffer)))
90 (insert-char char count)
91 (with-current-buffer buffer
92 (insert-char char count)))))))
94 (defvar binhex-crc-table
95 [0 4129 8258 12387 16516 20645 24774 28903
96 33032 37161 41290 45419 49548 53677 57806 61935
97 4657 528 12915 8786 21173 17044 29431 25302
98 37689 33560 45947 41818 54205 50076 62463 58334
99 9314 13379 1056 5121 25830 29895 17572 21637
100 42346 46411 34088 38153 58862 62927 50604 54669
101 13907 9842 5649 1584 30423 26358 22165 18100
102 46939 42874 38681 34616 63455 59390 55197 51132
103 18628 22757 26758 30887 2112 6241 10242 14371
104 51660 55789 59790 63919 35144 39273 43274 47403
105 23285 19156 31415 27286 6769 2640 14899 10770
106 56317 52188 64447 60318 39801 35672 47931 43802
107 27814 31879 19684 23749 11298 15363 3168 7233
108 60846 64911 52716 56781 44330 48395 36200 40265
109 32407 28342 24277 20212 15891 11826 7761 3696
110 65439 61374 57309 53244 48923 44858 40793 36728
111 37256 33193 45514 41451 53516 49453 61774 57711
112 4224 161 12482 8419 20484 16421 28742 24679
113 33721 37784 41979 46042 49981 54044 58239 62302
114 689 4752 8947 13010 16949 21012 25207 29270
115 46570 42443 38312 34185 62830 58703 54572 50445
116 13538 9411 5280 1153 29798 25671 21540 17413
117 42971 47098 34713 38840 59231 63358 50973 55100
118 9939 14066 1681 5808 26199 30326 17941 22068
119 55628 51565 63758 59695 39368 35305 47498 43435
120 22596 18533 30726 26663 6336 2273 14466 10403
121 52093 56156 60223 64286 35833 39896 43963 48026
122 19061 23124 27191 31254 2801 6864 10931 14994
123 64814 60687 56684 52557 48554 44427 40424 36297
124 31782 27655 23652 19525 15522 11395 7392 3265
125 61215 65342 53085 57212 44955 49082 36825 40952
126 28183 32310 20053 24180 11923 16050 3793 7920])
128 (defun binhex-update-crc (crc char &optional count)
129 (if (null count) (setq count 1))
131 (setq crc (logxor (logand (lsh crc 8) 65280)
132 (aref binhex-crc-table
133 (logxor (logand (lsh crc -8) 255)
138 (defun binhex-verify-crc (buffer start end)
139 (with-current-buffer buffer
140 (let ((pos start) (crc 0) (last (- end 2)))
142 (setq crc (binhex-update-crc crc (char-after pos))
144 (if (= crc (binhex-string-big-endian (buffer-substring last end)))
146 (error "CRC error")))))
148 (defun binhex-string-big-endian (string)
149 (let ((ret 0) (i 0) (len (length string)))
151 (setq ret (+ (lsh ret 8) (binhex-char-int (aref string i)))
155 (defun binhex-string-little-endian (string)
156 (let ((ret 0) (i 0) (shift 0) (len (length string)))
158 (setq ret (+ ret (lsh (binhex-char-int (aref string i)) shift))
163 (defun binhex-header (buffer)
164 (with-current-buffer buffer
165 (let ((pos (point-min)) len)
168 (setq len (binhex-char-int (char-after pos)))
170 (buffer-substring pos (setq pos (+ pos len)))
172 (setq len (binhex-char-int (char-after pos)))
174 (buffer-substring pos (setq pos (+ pos 4)))
175 (buffer-substring pos (setq pos (+ pos 4)))
176 (binhex-string-big-endian
177 (buffer-substring pos (setq pos (+ pos 2))))
178 (binhex-string-big-endian
179 (buffer-substring pos (setq pos (+ pos 4))))
180 (binhex-string-big-endian
181 (buffer-substring pos (setq pos (+ pos 4))))))))
183 (defvar binhex-last-char)
184 (defvar binhex-repeat)
186 (defun binhex-push-char (char &optional count ignored buffer)
190 (binhex-insert-char (setq binhex-last-char 144) 1
192 (binhex-insert-char binhex-last-char (- char 1)
194 (setq binhex-last-char nil))
195 (setq binhex-repeat nil))
197 (setq binhex-repeat t))
199 (binhex-insert-char (setq binhex-last-char char) 1 ignored buffer))))
202 (defun binhex-decode-region-internal (start end &optional header-only)
203 "Binhex decode region between START and END without using an external program.
204 If HEADER-ONLY is non-nil only decode header and return filename."
206 (let ((work-buffer nil)
210 (non-data-chars " \t\n\r:")
211 file-name-length data-fork-start
213 binhex-last-char binhex-repeat)
217 (when (re-search-forward binhex-begin-line end t)
218 (let (default-enable-multibyte-characters)
219 (setq work-buffer (generate-new-buffer " *binhex-work*")))
221 (setq bits 0 counter 0)
223 (skip-chars-forward non-data-chars end)
224 (setq inputpos (point))
227 (while (and (< inputpos lim)
228 (setq tmp (binhex-char-map (char-after inputpos))))
229 (setq bits (+ bits tmp)
231 inputpos (1+ inputpos))
233 (binhex-push-char (lsh bits -16) 1 nil work-buffer)
234 (binhex-push-char (logand (lsh bits -8) 255) 1 nil
236 (binhex-push-char (logand bits 255) 1 nil
238 (setq bits 0 counter 0))
239 (t (setq bits (lsh bits 6)))))
240 (if (null file-name-length)
241 (with-current-buffer work-buffer
242 (setq file-name-length (char-after (point-min))
243 data-fork-start (+ (point-min)
244 file-name-length 22))))
245 (when (and (null header)
246 (with-current-buffer work-buffer
247 (>= (buffer-size) data-fork-start)))
248 (binhex-verify-crc work-buffer
249 (point-min) data-fork-start)
250 (setq header (binhex-header work-buffer))
251 (when header-only (setq tmp nil counter 0)))
252 (setq tmp (and tmp (not (eq inputpos end)))))
255 (binhex-push-char (logand (lsh bits -16) 255) 1 nil
257 (binhex-push-char (logand (lsh bits -8) 255) 1 nil
260 (binhex-push-char (logand (lsh bits -10) 255) 1 nil
263 (binhex-verify-crc work-buffer
265 (+ data-fork-start (aref header 6) 2))
266 (or (markerp end) (setq end (set-marker (make-marker) end)))
268 (insert-buffer-substring work-buffer
269 data-fork-start (+ data-fork-start
271 (delete-region (point) end)))
272 (and work-buffer (kill-buffer work-buffer)))
273 (if header (aref header 1))))
276 (defun binhex-decode-region-external (start end)
277 "Binhex decode region between START and END using external decoder."
279 (let ((cbuf (current-buffer)) firstline work-buffer status
280 (file-name (expand-file-name
281 (concat (binhex-decode-region-internal start end t)
283 binhex-temporary-file-directory)))
286 (when (re-search-forward binhex-begin-line nil t)
287 (let ((cdir default-directory) default-process-coding-system)
290 (set-buffer (setq work-buffer
291 (generate-new-buffer " *binhex-work*")))
292 (buffer-disable-undo work-buffer)
293 (insert-buffer-substring cbuf firstline end)
294 (cd binhex-temporary-file-directory)
295 (apply 'call-process-region
298 binhex-decoder-program
302 binhex-decoder-switches))
303 (cd cdir) (set-buffer cbuf)))
304 (if (and file-name (file-exists-p file-name))
307 (delete-region start end)
309 (insert-file-contents-literally file-name)))
310 (error "Can not binhex")))
311 (and work-buffer (kill-buffer work-buffer))
313 (if file-name (delete-file file-name))))))
316 (defun binhex-decode-region (start end)
317 "Binhex decode region between START and END."
319 (if binhex-use-external
320 (binhex-decode-region-external start end)
321 (binhex-decode-region-internal start end)))
325 ;;; arch-tag: 8476badd-1e76-4f1d-a640-f9a38c72eed8
326 ;;; binhex.el ends here