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+;;; binhex.el --- elisp native binhex decode
+
+;; Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004,
+;; 2005, 2006, 2007 Free Software Foundation, Inc.
+
+;; Author: Shenghuo Zhu <zsh@cs.rochester.edu>
+;; Keywords: binhex news
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 3, or (at your option)
+;; any later version.
+
+;; GNU Emacs is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs; see the file COPYING. If not, write to the
+;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+;; Boston, MA 02110-1301, USA.
+
+;;; Commentary:
+
+;;; Code:
+
+(eval-when-compile (require 'cl))
+
+(eval-and-compile
+ (defalias 'binhex-char-int
+ (if (fboundp 'char-int)
+ 'char-int
+ 'identity)))
+
+(defgroup binhex nil
+ "Decoding of BinHex (binary-to-hexadecimal) data."
+ :group 'mail
+ :group 'news)
+
+(defcustom binhex-decoder-program "hexbin"
+ "*Non-nil value should be a string that names a binhex decoder.
+The program should expect to read binhex data on its standard
+input and write the converted data to its standard output."
+ :type 'string
+ :group 'binhex)
+
+(defcustom binhex-decoder-switches '("-d")
+ "*List of command line flags passed to the command `binhex-decoder-program'."
+ :group 'binhex
+ :type '(repeat string))
+
+(defcustom binhex-use-external
+ (executable-find binhex-decoder-program)
+ "*Use external binhex program."
+ :version "22.1"
+ :group 'binhex
+ :type 'boolean)
+
+(defconst binhex-alphabet-decoding-alist
+ '(( ?\! . 0) ( ?\" . 1) ( ?\# . 2) ( ?\$ . 3) ( ?\% . 4) ( ?\& . 5)
+ ( ?\' . 6) ( ?\( . 7) ( ?\) . 8) ( ?\* . 9) ( ?\+ . 10) ( ?\, . 11)
+ ( ?\- . 12) ( ?0 . 13) ( ?1 . 14) ( ?2 . 15) ( ?3 . 16) ( ?4 . 17)
+ ( ?5 . 18) ( ?6 . 19) ( ?8 . 20) ( ?9 . 21) ( ?@ . 22) ( ?A . 23)
+ ( ?B . 24) ( ?C . 25) ( ?D . 26) ( ?E . 27) ( ?F . 28) ( ?G . 29)
+ ( ?H . 30) ( ?I . 31) ( ?J . 32) ( ?K . 33) ( ?L . 34) ( ?M . 35)
+ ( ?N . 36) ( ?P . 37) ( ?Q . 38) ( ?R . 39) ( ?S . 40) ( ?T . 41)
+ ( ?U . 42) ( ?V . 43) ( ?X . 44) ( ?Y . 45) ( ?Z . 46) ( ?\[ . 47)
+ ( ?\` . 48) ( ?a . 49) ( ?b . 50) ( ?c . 51) ( ?d . 52) ( ?e . 53)
+ ( ?f . 54) ( ?h . 55) ( ?i . 56) ( ?j . 57) ( ?k . 58) ( ?l . 59)
+ ( ?m . 60) ( ?p . 61) ( ?q . 62) ( ?r . 63)))
+
+(defun binhex-char-map (char)
+ (cdr (assq char binhex-alphabet-decoding-alist)))
+
+;;;###autoload
+(defconst binhex-begin-line
+ "^:...............................................................$")
+(defconst binhex-body-line
+ "^[^:]...............................................................$")
+(defconst binhex-end-line ":$")
+
+(defvar binhex-temporary-file-directory
+ (cond ((fboundp 'temp-directory) (temp-directory))
+ ((boundp 'temporary-file-directory) temporary-file-directory)
+ ("/tmp/")))
+
+(eval-and-compile
+ (defalias 'binhex-insert-char
+ (if (featurep 'xemacs)
+ 'insert-char
+ (lambda (char &optional count ignored buffer)
+ "Insert COUNT copies of CHARACTER into BUFFER."
+ (if (or (null buffer) (eq buffer (current-buffer)))
+ (insert-char char count)
+ (with-current-buffer buffer
+ (insert-char char count)))))))
+
+(defvar binhex-crc-table
+ [0 4129 8258 12387 16516 20645 24774 28903
+ 33032 37161 41290 45419 49548 53677 57806 61935
+ 4657 528 12915 8786 21173 17044 29431 25302
+ 37689 33560 45947 41818 54205 50076 62463 58334
+ 9314 13379 1056 5121 25830 29895 17572 21637
+ 42346 46411 34088 38153 58862 62927 50604 54669
+ 13907 9842 5649 1584 30423 26358 22165 18100
+ 46939 42874 38681 34616 63455 59390 55197 51132
+ 18628 22757 26758 30887 2112 6241 10242 14371
+ 51660 55789 59790 63919 35144 39273 43274 47403
+ 23285 19156 31415 27286 6769 2640 14899 10770
+ 56317 52188 64447 60318 39801 35672 47931 43802
+ 27814 31879 19684 23749 11298 15363 3168 7233
+ 60846 64911 52716 56781 44330 48395 36200 40265
+ 32407 28342 24277 20212 15891 11826 7761 3696
+ 65439 61374 57309 53244 48923 44858 40793 36728
+ 37256 33193 45514 41451 53516 49453 61774 57711
+ 4224 161 12482 8419 20484 16421 28742 24679
+ 33721 37784 41979 46042 49981 54044 58239 62302
+ 689 4752 8947 13010 16949 21012 25207 29270
+ 46570 42443 38312 34185 62830 58703 54572 50445
+ 13538 9411 5280 1153 29798 25671 21540 17413
+ 42971 47098 34713 38840 59231 63358 50973 55100
+ 9939 14066 1681 5808 26199 30326 17941 22068
+ 55628 51565 63758 59695 39368 35305 47498 43435
+ 22596 18533 30726 26663 6336 2273 14466 10403
+ 52093 56156 60223 64286 35833 39896 43963 48026
+ 19061 23124 27191 31254 2801 6864 10931 14994
+ 64814 60687 56684 52557 48554 44427 40424 36297
+ 31782 27655 23652 19525 15522 11395 7392 3265
+ 61215 65342 53085 57212 44955 49082 36825 40952
+ 28183 32310 20053 24180 11923 16050 3793 7920])
+
+(defun binhex-update-crc (crc char &optional count)
+ (if (null count) (setq count 1))
+ (while (> count 0)
+ (setq crc (logxor (logand (lsh crc 8) 65280)
+ (aref binhex-crc-table
+ (logxor (logand (lsh crc -8) 255)
+ char)))
+ count (1- count)))
+ crc)
+
+(defun binhex-verify-crc (buffer start end)
+ (with-current-buffer buffer
+ (let ((pos start) (crc 0) (last (- end 2)))
+ (while (< pos last)
+ (setq crc (binhex-update-crc crc (char-after pos))
+ pos (1+ pos)))
+ (if (= crc (binhex-string-big-endian (buffer-substring last end)))
+ nil
+ (error "CRC error")))))
+
+(defun binhex-string-big-endian (string)
+ (let ((ret 0) (i 0) (len (length string)))
+ (while (< i len)
+ (setq ret (+ (lsh ret 8) (binhex-char-int (aref string i)))
+ i (1+ i)))
+ ret))
+
+(defun binhex-string-little-endian (string)
+ (let ((ret 0) (i 0) (shift 0) (len (length string)))
+ (while (< i len)
+ (setq ret (+ ret (lsh (binhex-char-int (aref string i)) shift))
+ i (1+ i)
+ shift (+ shift 8)))
+ ret))
+
+(defun binhex-header (buffer)
+ (with-current-buffer buffer
+ (let ((pos (point-min)) len)
+ (vector
+ (prog1
+ (setq len (binhex-char-int (char-after pos)))
+ (setq pos (1+ pos)))
+ (buffer-substring pos (setq pos (+ pos len)))
+ (prog1
+ (setq len (binhex-char-int (char-after pos)))
+ (setq pos (1+ pos)))
+ (buffer-substring pos (setq pos (+ pos 4)))
+ (buffer-substring pos (setq pos (+ pos 4)))
+ (binhex-string-big-endian
+ (buffer-substring pos (setq pos (+ pos 2))))
+ (binhex-string-big-endian
+ (buffer-substring pos (setq pos (+ pos 4))))
+ (binhex-string-big-endian
+ (buffer-substring pos (setq pos (+ pos 4))))))))
+
+(defvar binhex-last-char)
+(defvar binhex-repeat)
+
+(defun binhex-push-char (char &optional count ignored buffer)
+ (cond
+ (binhex-repeat
+ (if (eq char 0)
+ (binhex-insert-char (setq binhex-last-char 144) 1
+ ignored buffer)
+ (binhex-insert-char binhex-last-char (- char 1)
+ ignored buffer)
+ (setq binhex-last-char nil))
+ (setq binhex-repeat nil))
+ ((= char 144)
+ (setq binhex-repeat t))
+ (t
+ (binhex-insert-char (setq binhex-last-char char) 1 ignored buffer))))
+
+;;;###autoload
+(defun binhex-decode-region-internal (start end &optional header-only)
+ "Binhex decode region between START and END without using an external program.
+If HEADER-ONLY is non-nil only decode header and return filename."
+ (interactive "r")
+ (let ((work-buffer nil)
+ (counter 0)
+ (bits 0) (tmp t)
+ (lim 0) inputpos
+ (non-data-chars " \t\n\r:")
+ file-name-length data-fork-start
+ header
+ binhex-last-char binhex-repeat)
+ (unwind-protect
+ (save-excursion
+ (goto-char start)
+ (when (re-search-forward binhex-begin-line end t)
+ (let (default-enable-multibyte-characters)
+ (setq work-buffer (generate-new-buffer " *binhex-work*")))
+ (beginning-of-line)
+ (setq bits 0 counter 0)
+ (while tmp
+ (skip-chars-forward non-data-chars end)
+ (setq inputpos (point))
+ (end-of-line)
+ (setq lim (point))
+ (while (and (< inputpos lim)
+ (setq tmp (binhex-char-map (char-after inputpos))))
+ (setq bits (+ bits tmp)
+ counter (1+ counter)
+ inputpos (1+ inputpos))
+ (cond ((= counter 4)
+ (binhex-push-char (lsh bits -16) 1 nil work-buffer)
+ (binhex-push-char (logand (lsh bits -8) 255) 1 nil
+ work-buffer)
+ (binhex-push-char (logand bits 255) 1 nil
+ work-buffer)
+ (setq bits 0 counter 0))
+ (t (setq bits (lsh bits 6)))))
+ (if (null file-name-length)
+ (with-current-buffer work-buffer
+ (setq file-name-length (char-after (point-min))
+ data-fork-start (+ (point-min)
+ file-name-length 22))))
+ (when (and (null header)
+ (with-current-buffer work-buffer
+ (>= (buffer-size) data-fork-start)))
+ (binhex-verify-crc work-buffer
+ (point-min) data-fork-start)
+ (setq header (binhex-header work-buffer))
+ (when header-only (setq tmp nil counter 0)))
+ (setq tmp (and tmp (not (eq inputpos end)))))
+ (cond
+ ((= counter 3)
+ (binhex-push-char (logand (lsh bits -16) 255) 1 nil
+ work-buffer)
+ (binhex-push-char (logand (lsh bits -8) 255) 1 nil
+ work-buffer))
+ ((= counter 2)
+ (binhex-push-char (logand (lsh bits -10) 255) 1 nil
+ work-buffer))))
+ (if header-only nil
+ (binhex-verify-crc work-buffer
+ data-fork-start
+ (+ data-fork-start (aref header 6) 2))
+ (or (markerp end) (setq end (set-marker (make-marker) end)))
+ (goto-char start)
+ (insert-buffer-substring work-buffer
+ data-fork-start (+ data-fork-start
+ (aref header 6)))
+ (delete-region (point) end)))
+ (and work-buffer (kill-buffer work-buffer)))
+ (if header (aref header 1))))
+
+;;;###autoload
+(defun binhex-decode-region-external (start end)
+ "Binhex decode region between START and END using external decoder."
+ (interactive "r")
+ (let ((cbuf (current-buffer)) firstline work-buffer status
+ (file-name (expand-file-name
+ (concat (binhex-decode-region-internal start end t)
+ ".data")
+ binhex-temporary-file-directory)))
+ (save-excursion
+ (goto-char start)
+ (when (re-search-forward binhex-begin-line nil t)
+ (let ((cdir default-directory) default-process-coding-system)
+ (unwind-protect
+ (progn
+ (set-buffer (setq work-buffer
+ (generate-new-buffer " *binhex-work*")))
+ (buffer-disable-undo work-buffer)
+ (insert-buffer-substring cbuf firstline end)
+ (cd binhex-temporary-file-directory)
+ (apply 'call-process-region
+ (point-min)
+ (point-max)
+ binhex-decoder-program
+ nil
+ nil
+ nil
+ binhex-decoder-switches))
+ (cd cdir) (set-buffer cbuf)))
+ (if (and file-name (file-exists-p file-name))
+ (progn
+ (goto-char start)
+ (delete-region start end)
+ (let (format-alist)
+ (insert-file-contents-literally file-name)))
+ (error "Can not binhex")))
+ (and work-buffer (kill-buffer work-buffer))
+ (ignore-errors
+ (if file-name (delete-file file-name))))))
+
+;;;###autoload
+(defun binhex-decode-region (start end)
+ "Binhex decode region between START and END."
+ (interactive "r")
+ (if binhex-use-external
+ (binhex-decode-region-external start end)
+ (binhex-decode-region-internal start end)))
+
+(provide 'binhex)
+
+;;; arch-tag: 8476badd-1e76-4f1d-a640-f9a38c72eed8
+;;; binhex.el ends here
generated by cgit v1.2.3 (git 2.39.1) at 2025-04-16 15:53:59 +0000