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1 ;;; mel-q.el: Quoted-Printable and Q-encoding encoder/decoder for GNU Emacs
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3 ;; Copyright (C) 1995,1996,1997 Free Software Foundation, Inc.
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5 ;; Author: MORIOKA Tomohiko <morioka@jaist.ac.jp>
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6 ;; Created: 1995/6/25
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7 ;; Version: $Id: mel-q.el,v 1.5 1997/07/26 22:09:47 steve Exp $
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8 ;; Keywords: MIME, Quoted-Printable, Q-encoding
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9
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10 ;; This file is part of MEL (MIME Encoding Library).
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11
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12 ;; This program is free software; you can redistribute it and/or
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13 ;; modify it under the terms of the GNU General Public License as
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14 ;; published by the Free Software Foundation; either version 2, or (at
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15 ;; your option) any later version.
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16
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17 ;; This program is distributed in the hope that it will be useful, but
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18 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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20 ;; General Public License for more details.
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21
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22 ;; You should have received a copy of the GNU General Public License
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23 ;; along with GNU Emacs; see the file COPYING. If not, write to the
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24 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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25 ;; Boston, MA 02111-1307, USA.
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26
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27 ;;; Code:
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28
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29 (require 'emu)
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30
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31
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177
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32 ;;; @ Quoted-Printable encoder
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33 ;;;
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34
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35 (defconst quoted-printable-hex-chars "0123456789ABCDEF")
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177
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36
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37 (defsubst quoted-printable-quote-char (character)
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38 (concat
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39 "="
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40 (char-to-string (aref quoted-printable-hex-chars (ash character -4)))
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41 (char-to-string (aref quoted-printable-hex-chars (logand character 15)))
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42 ))
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43
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177
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44 (defun quoted-printable-internal-encode-region (start end)
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45 (save-excursion
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46 (save-restriction
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47 (narrow-to-region start end)
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48 (goto-char start)
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49 (let ((col 0)
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50 enable-multibyte-characters)
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51 (while (< (point)(point-max))
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52 (cond ((>= col 75)
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53 (insert "=\n")
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54 (setq col 0)
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55 )
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56 ((looking-at "^From ")
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57 (replace-match "=46rom ")
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58 (backward-char 1)
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59 (setq col (+ col 6))
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60 )
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61 ((looking-at "[ \t]\n")
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62 (forward-char 1)
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63 (insert "=\n")
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64 (forward-char 1)
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65 (setq col 0)
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66 )
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67 (t
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68 (let ((chr (char-after (point))))
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69 (cond ((= chr ?\n)
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70 (forward-char 1)
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71 (setq col 0)
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72 )
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73 ((or (= chr ?\t)
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74 (and (<= 32 chr)(/= chr ?=)(< chr 127))
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75 )
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76 (forward-char 1)
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77 (setq col (1+ col))
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78 )
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79 ((>= col 73)
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80 (insert "=\n")
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81 (setq col 0)
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82 )
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83 (t
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84 (delete-char 1)
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85 (insert (quoted-printable-quote-char chr))
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86 (setq col (+ col 3))
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87 ))
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88 )))
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89 )))))
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90
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91 (defvar quoted-printable-external-encoder '("mmencode" "-q")
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92 "*list of quoted-printable encoder program name and its arguments.")
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93
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177
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94 (defun quoted-printable-external-encode-region (start end)
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95 (save-excursion
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96 (save-restriction
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97 (narrow-to-region start end)
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98 (as-binary-process
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99 (apply (function call-process-region)
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100 start end (car quoted-printable-external-encoder)
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101 t t nil (cdr quoted-printable-external-encoder))
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102 )
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103 ;; for OS/2
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104 ;; regularize line break code
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105 (goto-char (point-min))
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106 (while (re-search-forward "\r$" nil t)
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107 (replace-match "")
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108 )
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109 )))
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110
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111 (defvar quoted-printable-internal-encoding-limit
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112 (if (and (featurep 'xemacs)(featurep 'mule))
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113 0
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114 (require 'file-detect)
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115 (if (exec-installed-p "mmencode")
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116 1000
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117 (message "Don't found external encoder for Quoted-Printable!")
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118 nil))
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119 "*limit size to use internal quoted-printable encoder.
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120 If size of input to encode is larger than this limit,
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121 external encoder is called.")
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122
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177
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123 (defun quoted-printable-encode-region (start end)
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124 "Encode current region by quoted-printable.
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125 START and END are buffer positions.
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126 This function calls internal quoted-printable encoder if size of
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127 region is smaller than `quoted-printable-internal-encoding-limit',
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128 otherwise it calls external quoted-printable encoder specified by
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129 `quoted-printable-external-encoder'. In this case, you must install
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130 the program (maybe mmencode included in metamail or XEmacs package)."
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131 (interactive "r")
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132 (if (and quoted-printable-internal-encoding-limit
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133 (> (- end start) quoted-printable-internal-encoding-limit))
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134 (quoted-printable-external-encode-region start end)
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135 (quoted-printable-internal-encode-region start end)
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136 ))
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137
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138 (defun quoted-printable-encode-string (string)
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139 "Encode STRING to quoted-printable, and return the result."
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177
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140 (with-temp-buffer
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141 (insert string)
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142 (quoted-printable-encode-region (point-min)(point-max))
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143 (buffer-string)
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144 ))
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145
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146 (defun quoted-printable-insert-encoded-file (filename)
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147 "Encode contents of file FILENAME to quoted-printable, and insert the result.
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148 It calls external quoted-printable encoder specified by
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149 `quoted-printable-external-encoder'. So you must install the program
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150 \(maybe mmencode included in metamail or XEmacs package)."
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151 (interactive (list (read-file-name "Insert encoded file: ")))
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152 (apply (function call-process) (car quoted-printable-external-encoder)
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153 filename t nil (cdr quoted-printable-external-encoder))
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154 )
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155
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156
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157 ;;; @ Quoted-Printable decoder
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158 ;;;
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159
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155
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160 (defun quoted-printable-decode-string (string)
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161 "Decode STRING which is encoded in quoted-printable, and return the result."
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162 (let (q h l)
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163 (mapconcat (function
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164 (lambda (chr)
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165 (cond ((eq chr ?=)
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166 (setq q t)
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167 "")
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168 (q (setq h
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169 (cond ((<= ?a chr) (+ (- chr ?a) 10))
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170 ((<= ?A chr) (+ (- chr ?A) 10))
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171 ((<= ?0 chr) (- chr ?0))
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172 ))
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173 (setq q nil)
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174 "")
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175 (h (setq l (cond ((<= ?a chr) (+ (- chr ?a) 10))
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176 ((<= ?A chr) (+ (- chr ?A) 10))
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177 ((<= ?0 chr) (- chr ?0))
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178 ))
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179 (prog1
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180 (char-to-string (logior (ash h 4) l))
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181 (setq h nil)
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182 )
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183 )
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184 (t (char-to-string chr))
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185 )))
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186 string "")))
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187
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188 (defconst quoted-printable-octet-regexp
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189 (concat "=[" quoted-printable-hex-chars
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190 "][" quoted-printable-hex-chars "]"))
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191
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177
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192 (defun quoted-printable-internal-decode-region (start end)
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193 (save-excursion
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194 (save-restriction
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195 (narrow-to-region start end)
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196 (goto-char (point-min))
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197 (while (re-search-forward "=\n" nil t)
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198 (replace-match "")
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199 )
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200 (goto-char (point-min))
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201 (let (b e str)
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202 (while (re-search-forward quoted-printable-octet-regexp nil t)
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203 (setq b (match-beginning 0))
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204 (setq e (match-end 0))
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205 (setq str (buffer-substring b e))
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206 (delete-region b e)
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207 (insert (quoted-printable-decode-string str))
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208 ))
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209 )))
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210
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211 (defvar quoted-printable-external-decoder '("mmencode" "-q" "-u")
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212 "*list of quoted-printable decoder program name and its arguments.")
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213
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214 (defun quoted-printable-external-decode-region (start end)
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215 (save-excursion
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216 (as-binary-process
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217 (apply (function call-process-region)
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218 start end (car quoted-printable-external-decoder)
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219 t t nil (cdr quoted-printable-external-decoder))
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220 )))
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221
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222 (defvar quoted-printable-internal-decoding-limit nil
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223 "*limit size to use internal quoted-printable decoder.
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224 If size of input to decode is larger than this limit,
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225 external decoder is called.")
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226
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227 (defun quoted-printable-decode-region (start end)
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228 "Decode current region by quoted-printable.
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229 START and END are buffer positions.
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230 This function calls internal quoted-printable decoder if size of
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231 region is smaller than `quoted-printable-internal-decoding-limit',
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232 otherwise it calls external quoted-printable decoder specified by
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233 `quoted-printable-external-decoder'. In this case, you must install
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234 the program (maybe mmencode included in metamail or XEmacs package)."
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235 (interactive "r")
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236 (if (and quoted-printable-internal-decoding-limit
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237 (> (- end start) quoted-printable-internal-decoding-limit))
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238 (quoted-printable-external-decode-region start end)
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239 (quoted-printable-internal-decode-region start end)
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240 ))
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241
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242
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243 ;;; @ Q-encoding encode/decode string
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244 ;;;
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245
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246 (defconst q-encoding-special-chars-alist
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247 '((text ?= ?? ?_)
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248 (comment ?= ?? ?_ ?\( ?\) ?\\)
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249 (phrase ?= ?? ?_ ?\( ?\) ?\\ ?\" ?# ?$ ?% ?& ?' ?, ?. ?/
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250 ?: ?\; ?< ?> ?@ ?\[ ?\] ?^ ?` ?{ ?| ?} ?~)
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251 ))
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252
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253 (defun q-encoding-encode-string (string &optional mode)
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254 "Encode STRING to Q-encoding of encoded-word, and return the result.
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255 MODE allows `text', `comment', `phrase' or nil. Default value is
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256 `phrase'."
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257 (let ((specials (cdr (or (assq mode q-encoding-special-chars-alist)
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258 (assq 'phrase q-encoding-special-chars-alist)
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259 ))))
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260 (mapconcat (function
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261 (lambda (chr)
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262 (cond ((eq chr ? ) "_")
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263 ((or (< chr 32) (< 126 chr)
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264 (memq chr specials)
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265 )
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266 (quoted-printable-quote-char chr)
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267 )
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268 (t
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269 (char-to-string chr)
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270 ))
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271 ))
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272 string "")
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273 ))
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274
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275 (defun q-encoding-decode-string (string)
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276 "Decode STRING which is encoded in Q-encoding and return the result."
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277 (let (q h l)
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278 (mapconcat (function
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279 (lambda (chr)
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280 (cond ((eq chr ?_) " ")
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281 ((eq chr ?=)
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282 (setq q t)
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283 "")
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284 (q (setq h (cond ((<= ?a chr) (+ (- chr ?a) 10))
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285 ((<= ?A chr) (+ (- chr ?A) 10))
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286 ((<= ?0 chr) (- chr ?0))
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287 ))
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288 (setq q nil)
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289 "")
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290 (h (setq l (cond ((<= ?a chr) (+ (- chr ?a) 10))
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291 ((<= ?A chr) (+ (- chr ?A) 10))
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292 ((<= ?0 chr) (- chr ?0))
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293 ))
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294 (prog1
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295 (char-to-string (logior (ash h 4) l))
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296 (setq h nil)
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297 )
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298 )
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299 (t (char-to-string chr))
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300 )))
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301 string "")))
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302
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303
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304 ;;; @@ etc
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305 ;;;
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306
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307 (defun q-encoding-printable-char-p (chr mode)
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308 (and (not (memq chr '(?= ?? ?_)))
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309 (<= ?\ chr)(<= chr ?~)
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310 (cond ((eq mode 'text) t)
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311 ((eq mode 'comment)
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312 (not (memq chr '(?\( ?\) ?\\)))
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313 )
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314 (t
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315 (string-match "[A-Za-z0-9!*+/=_---]" (char-to-string chr))
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316 ))))
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317
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318 (defun q-encoding-encoded-length (string &optional mode)
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319 (let ((l 0)(i 0)(len (length string)) chr)
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320 (while (< i len)
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321 (setq chr (elt string i))
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322 (if (q-encoding-printable-char-p chr mode)
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323 (setq l (+ l 1))
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324 (setq l (+ l 3))
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325 )
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326 (setq i (+ i 1)) )
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327 l))
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328
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329
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330 ;;; @ end
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331 ;;;
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332
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333 (provide 'mel-q)
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334
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335 ;;; mel-q.el ends here
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