From: yamaoka Date: Wed, 7 Aug 2002 13:15:15 +0000 (+0000) Subject: Addition. X-Git-Tag: t-gnus-6_15_8-01-quimby~44 X-Git-Url: http://git.chise.org/gitweb/?a=commitdiff_plain;h=8d6da0617909a3da33a6e9e4d0a59d770b0e8f85;p=elisp%2Fgnus.git- Addition. --- diff --git a/lisp/yenc.el b/lisp/yenc.el new file mode 100644 index 0000000..3fea50f --- /dev/null +++ b/lisp/yenc.el @@ -0,0 +1,120 @@ +;;; yenc.el --- elisp native yenc decoder +;; Copyright (c) 2002 Free Software Foundation, Inc. + +;; Author: Jesper Harder +;; Keywords: yenc 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 2, 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., 59 Temple Place - Suite 330, +;; Boston, MA 02111-1307, USA. + +;;; Commentary: + +;; Functions for decoding yenc encoded messages. +;; +;; Limitations: +;; +;; * Does not handle multipart messages. +;; * No support for external decoders. +;; * Doesn't check the crc32 checksum (if present). + +;;; Code: + +(eval-when-compile (require 'cl)) + +(defconst yenc-begin-line + "^=ybegin.*$") + +(defconst yenc-decoding-vector + [214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 + 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 + 248 249 250 251 252 253 254 255 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 + 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 + 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 + 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 + 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 + 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 + 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 + 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 + 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 + 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 + 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 + 208 209 210 211 212 213]) + +;;;###autoload +(defun yenc-decode-region (start end) + "Yenc decode region between START and END using an internal decoder." + (interactive "r") + (let (work-buffer) + (unwind-protect + (save-excursion + (goto-char start) + (when (re-search-forward yenc-begin-line end t) + (let ((first (match-end 0)) + (header-alist (yenc-parse-line (match-string 0))) + bytes last footer-alist char) + (when (re-search-forward "^=ypart.*$" end t) + (setq first (match-end 0))) + (when (re-search-forward "^=yend.*$" end t) + (setq last (match-beginning 0)) + (setq footer-alist (yenc-parse-line (match-string 0))) + (let (default-enable-multibyte-characters) + (setq work-buffer (generate-new-buffer " *yenc-work*"))) + (while (< first last) + (setq char (char-after first)) + (cond ((or (eq char ?\r) + (eq char ?\n))) + ((eq char ?=) + (setq char (char-after (incf first))) + (with-current-buffer work-buffer + (insert-char (mod (- char 106) 256) 1))) + (t + (with-current-buffer work-buffer + ;;(insert-char (mod (- char 42) 256) 1) + (insert-char (aref yenc-decoding-vector char) 1)))) + (incf first)) + (setq bytes (buffer-size work-buffer)) + (unless (and (= (cdr (assq 'size header-alist)) bytes) + (= (cdr (assq 'size footer-alist)) bytes)) + (message "Warning: Size mismatch while decoding.")) + (goto-char start) + (delete-region start end) + (insert-buffer-substring work-buffer)))) + (and work-buffer (kill-buffer work-buffer)))))) + +;;;###autoload +(defun yenc-extract-filename () + "Extract file name from an yenc header." + (save-excursion + (when (re-search-forward yenc-begin-line nil t) + (cdr (assoc 'name (yenc-parse-line (match-string 0))))))) + +(defun yenc-parse-line (str) + "Extract file name and size from STR." + (let (result name) + (when (string-match "^=y.*size=\\([0-9]+\\)" str) + (push (cons 'size (string-to-number (match-string 1 str))) result)) + (when (string-match "^=y.*name=\\(.*\\)$" str) + (setq name (match-string 1 str)) + ;; Remove trailing white space + (when (string-match " +$" name) + (setq name (substring name 0 (match-beginning 0)))) + (push (cons 'name name) result)) + result)) + +(provide 'yenc) + +;;; yenc.el ends here