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1 ;;; tm-ew-d.el --- RFC 1522 based MIME encoded-word decoder for GNU Emacs
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3 ;; Copyright (C) 1995,1996 Free Software Foundation, Inc.
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5 ;; Author: ENAMI Tsugutomo <enami@sys.ptg.sony.co.jp>
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6 ;; MORIOKA Tomohiko <morioka@jaist.ac.jp>
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7 ;; Maintainer: MORIOKA Tomohiko <morioka@jaist.ac.jp>
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8 ;; Created: 1995/10/03
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9 ;; Original: 1992/07/20 ENAMI Tsugutomo's `mime.el'.
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10 ;; Renamed: 1993/06/03 to tiny-mime.el.
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11 ;; Renamed: 1995/10/03 from tiny-mime.el. (split off encoder)
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12 ;; Version: $Revision: 1.1.1.1 $
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13 ;; Keywords: mail, news, MIME, RFC 1522, multilingual, encoded-word
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14
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15 ;; This file is part of tm (Tools for MIME).
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16
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17 ;; This program is free software; you can redistribute it and/or
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18 ;; modify it under the terms of the GNU General Public License as
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19 ;; published by the Free Software Foundation; either version 2, or (at
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20 ;; your option) any later version.
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21
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22 ;; This program is distributed in the hope that it will be useful, but
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23 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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24 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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25 ;; General Public License for more details.
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26
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27 ;; You should have received a copy of the GNU General Public License
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28 ;; along with GNU Emacs; see the file COPYING. If not, write to the
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29 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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30 ;; Boston, MA 02111-1307, USA.
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31
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32 ;;; Code:
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33
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34 (require 'emu)
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35 (require 'std11)
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36 (require 'mel)
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37 (require 'tm-def)
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38
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39
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40 ;;; @ version
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41 ;;;
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42
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43 (defconst tm-ew-d/RCS-ID
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44 "$Id: tm-ew-d.el,v 1.1.1.1 1996/12/18 22:43:37 steve Exp $")
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45 (defconst mime/eword-decoder-version (get-version-string tm-ew-d/RCS-ID))
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46
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47
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48 ;;; @ MIME encoded-word definition
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49 ;;;
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50
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51 (defconst mime/encoded-text-regexp "[!->@-~]+")
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52 (defconst mime/encoded-word-regexp (concat (regexp-quote "=?")
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53 "\\("
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54 mime/charset-regexp
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55 "\\)"
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56 (regexp-quote "?")
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57 "\\(B\\|Q\\)"
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58 (regexp-quote "?")
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59 "\\("
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60 mime/encoded-text-regexp
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61 "\\)"
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62 (regexp-quote "?=")))
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63
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64
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65 ;;; @ for string
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66 ;;;
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67
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68 (defun mime-eword/decode-string (string &optional must-unfold)
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69 "Decode MIME encoded-words in STRING.
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70
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71 STRING is unfolded before decoding.
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72
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73 If an encoded-word is broken or your emacs implementation can not
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74 decode the charset included in it, it is not decoded.
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75
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76 If MUST-UNFOLD is non-nil, it unfolds and eliminates line-breaks even
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77 if there are in decoded encoded-words (generated by bad manner MUA
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78 such as a version of Net$cape). [tm-ew-d.el]"
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79 (setq string (std11-unfold-string string))
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80 (let ((dest "")(ew nil)
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81 beg end)
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82 (while (and (string-match mime/encoded-word-regexp string)
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83 (setq beg (match-beginning 0)
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84 end (match-end 0))
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85 )
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86 (if (> beg 0)
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87 (if (not
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88 (and (eq ew t)
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89 (string-match "^[ \t]+$" (substring string 0 beg))
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90 ))
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91 (setq dest (concat dest (substring string 0 beg)))
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92 )
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93 )
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94 (setq dest
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95 (concat dest
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96 (mime/decode-encoded-word
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97 (substring string beg end) must-unfold)
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98 ))
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99 (setq string (substring string end))
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100 (setq ew t)
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101 )
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102 (concat dest string)
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103 ))
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104
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105
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106 ;;; @ for region
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107 ;;;
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108
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109 (defun mime-eword/decode-region (start end &optional unfolding must-unfold)
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110 "Decode MIME encoded-words in region between START and END.
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111
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112 If UNFOLDING is not nil, it unfolds before decoding.
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113
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114 If MUST-UNFOLD is non-nil, it unfolds and eliminates line-breaks even
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115 if there are in decoded encoded-words (generated by bad manner MUA
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116 such as a version of Net$cape). [tm-ew-d.el]"
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117 (interactive "*r")
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118 (save-excursion
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119 (save-restriction
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120 (narrow-to-region start end)
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121 (if unfolding
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122 (mime/unfolding)
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123 )
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124 (goto-char (point-min))
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125 (while (re-search-forward
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126 (concat (regexp-quote "?=") "\\s +" (regexp-quote "=?"))
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127 nil t)
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128 (replace-match "?==?")
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129 )
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130 (goto-char (point-min))
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131 (let (charset encoding text)
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132 (while (re-search-forward mime/encoded-word-regexp nil t)
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133 (insert (mime/decode-encoded-word
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134 (prog1
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135 (buffer-substring (match-beginning 0) (match-end 0))
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136 (delete-region (match-beginning 0) (match-end 0))
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137 ) must-unfold))
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138 ))
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139 )))
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140
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141
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142 ;;; @ for message header
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143 ;;;
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144
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145 (defun mime/decode-message-header ()
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146 "Decode MIME encoded-words in message header. [tm-ew-d.el]"
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147 (interactive "*")
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148 (save-excursion
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149 (save-restriction
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150 (narrow-to-region (goto-char (point-min))
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151 (progn (re-search-forward "^$" nil t) (point)))
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152 (mime-eword/decode-region (point-min) (point-max) t)
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153 )))
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154
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155 (defun mime/unfolding ()
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156 (goto-char (point-min))
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157 (let (field beg end)
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158 (while (re-search-forward std11-field-head-regexp nil t)
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159 (setq beg (match-beginning 0)
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160 end (std11-field-end))
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161 (setq field (buffer-substring beg end))
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162 (if (string-match mime/encoded-word-regexp field)
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163 (save-restriction
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164 (narrow-to-region (goto-char beg) end)
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165 (while (re-search-forward "\n[ \t]+" nil t)
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166 (replace-match " ")
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167 )
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168 (goto-char (point-max))
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169 ))
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170 )))
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171
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172
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173 ;;; @ encoded-word decoder
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174 ;;;
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175
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176 (defun mime/decode-encoded-word (word &optional must-unfold)
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177 "Decode WORD if it is an encoded-word.
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178
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179 If your emacs implementation can not decode the charset of WORD, it
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180 returns WORD. Similarly the encoded-word is broken, it returns WORD.
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181
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182 If MUST-UNFOLD is non-nil, it unfolds and eliminates line-breaks even
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183 if there are in decoded encoded-word (generated by bad manner MUA such
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184 as a version of Net$cape). [tm-ew-d.el]"
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185 (or (if (string-match mime/encoded-word-regexp word)
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186 (let ((charset
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187 (substring word (match-beginning 1) (match-end 1))
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188 )
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189 (encoding
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190 (upcase
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191 (substring word (match-beginning 2) (match-end 2))
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192 ))
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193 (text
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194 (substring word (match-beginning 3) (match-end 3))
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195 ))
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196 (mime/decode-encoded-text charset encoding text must-unfold)
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197 ))
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198 word))
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199
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200
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201 ;;; @ encoded-text decoder
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202 ;;;
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203
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204 (defun mime/decode-encoded-text (charset encoding string &optional must-unfold)
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205 "Decode STRING as an encoded-text.
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206
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207 If your emacs implementation can not decode CHARSET, it returns nil.
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208
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209 If ENCODING is not \"B\" or \"Q\", it occurs error.
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210 So you should write error-handling code if you don't want break by errors.
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211
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212 If MUST-UNFOLD is non-nil, it unfolds and eliminates line-breaks even
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213 if there are in decoded encoded-text (generated by bad manner MUA such
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214 as a version of Net$cape). [tm-ew-d.el]"
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215 (let ((cs (mime-charset-to-coding-system charset)))
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216 (if cs
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217 (let ((dest
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218 (cond ((string-equal "B" encoding)
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219 (base64-decode-string string))
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220 ((string-equal "Q" encoding)
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221 (q-encoding-decode-string string))
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222 (t (message "unknown encoding %s" encoding)
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223 nil))))
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224 (if dest
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225 (progn
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226 (setq dest (decode-coding-string dest cs))
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227 (if must-unfold
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228 (mapconcat (function
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229 (lambda (chr)
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230 (if (eq chr ?\n)
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231 ""
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232 (char-to-string chr)
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233 )
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234 ))
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235 (std11-unfold-string dest)
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236 "")
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237 dest)
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238 ))))))
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239
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240
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241 ;;; @ end
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242 ;;;
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243
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244 (provide 'tm-ew-d)
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245
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246 ;;; tm-ew-d.el ends here
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