| 1 | ###########################################################################
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| 2 | #
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| 3 | # ghtml.pm -- this used to be called html.pm but it clashed
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| 4 | # with the existing html module under windows
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| 5 | #
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| 6 | # A component of the Greenstone digital library software
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| 7 | # from the New Zealand Digital Library Project at the
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| 8 | # University of Waikato, New Zealand.
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| 9 | #
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| 10 | # Copyright (C) 1999 New Zealand Digital Library Project
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| 11 | #
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| 12 | # This program is free software; you can redistribute it and/or modify
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| 13 | # it under the terms of the GNU General Public License as published by
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| 14 | # the Free Software Foundation; either version 2 of the License, or
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| 15 | # (at 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,
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| 18 | # but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 20 | # GNU 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 this program; if not, write to the Free Software
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| 24 | # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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| 25 | #
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| 26 | ###########################################################################
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| 27 |
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| 28 | package ghtml;
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| 29 |
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| 30 | use strict;
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| 31 | use unicode;
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| 32 |
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| 33 | # htmlsafe(TEXT)
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| 34 | #
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| 35 | # Converts SGML meta characters in TEXT to entity references.
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| 36 | #
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| 37 | sub htmlsafe
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| 38 | {
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| 39 | $_[0] =~ s/&/&/osg;
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| 40 | $_[0] =~ s/</</osg;
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| 41 | $_[0] =~ s/>/>/osg;
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| 42 | $_[0] =~ s/\"/"/osg;
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| 43 | }
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| 44 |
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| 45 | # unescape_html(TEXT)
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| 46 | #
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| 47 | # Converts HTML entities into their original form.
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| 48 | #
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| 49 | sub unescape_html
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| 50 | {
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| 51 | my ($html) = @_;
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| 52 |
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| 53 | $html =~ s/&/&/osg;
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| 54 | $html =~ s/</</osg;
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| 55 | $html =~ s/>/>/osg;
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| 56 | $html =~ s/"/\"/osg;
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| 57 |
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| 58 | return $html;
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| 59 | }
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| 60 |
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| 61 | # urlsafe(TEXT)
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| 62 | #
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| 63 | # Converts characters not allowed in a URL to their hex representation.
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| 64 | #
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| 65 | sub urlsafe
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| 66 | {
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| 67 | $_[0] =~ s/[\x09\x20\x22\x3c\x3e\x5b\x5c\x5d\x5e\x60\x7b\x7c\x7d\x7e\?\=\&\+_\/]/sprintf("%%%2x", ord($&))/gse;
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| 68 | }
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| 69 |
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| 70 |
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| 71 | # named entry to the standard html font
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| 72 | my %charnetosf = ("Agrave"=> "192", "Aacute"=> "193", "Acirc" => "194", "Atilde"=> "195",
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| 73 | "Auml" => "196", "Aring" => "197", "AElig" => "198", "Ccedil"=> "199",
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| 74 | "Egrave"=> "200", "Eacute"=> "201", "Ecirc" => "202", "Euml" => "203",
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| 75 | "Igrave"=> "204", "Iacute"=> "205", "Icirc" => "206", "Iuml" => "207",
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| 76 | "ETH" => "208", "Ntilde"=> "209", "Ograve"=> "210", "Oacute"=> "211",
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| 77 | "Ocirc" => "212", "Otilde"=> "213", "Ouml" => "214",
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| 78 | "Oslash"=> "216", "Ugrave"=> "217", "Uacute"=> "218", "Ucirc" => "219",
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| 79 | "Uuml" => "220", "Yacute"=> "221", "THORN" => "222", "szlig" => "223",
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| 80 | "agrave"=> "224", "aacute"=> "225", "acirc" => "226", "atilde"=> "227",
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| 81 | "auml" => "228", "aring" => "229", "aelig" => "230", "ccedil"=> "231",
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| 82 | "egrave"=> "232", "eacute"=> "233", "ecirc" => "234", "euml" => "235",
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| 83 | "igrave"=> "236", "iacute"=> "237", "icirc" => "238", "iuml" => "239",
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| 84 | "eth" => "240", "ntilde"=> "241", "ograve"=> "242", "oacute"=> "243",
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| 85 | "ocirc" => "244", "otilde"=> "245", "ouml" => "246",
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| 86 | "oslash"=> "248", "ugrave"=> "249", "uacute"=> "250", "ucirc" => "251",
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| 87 | "uuml" => "252", "yacute"=> "253", "thorn" => "254", "yuml" => "255");
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| 88 |
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| 89 | my %symnetosf = ("quot" => "34", "amp" => "38", "lt" => "60", "gt" => "62",
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| 90 | "nbsp" => "160", "iexcl" => "161", "cent" => "162", "pound" => "163",
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| 91 | "curren"=> "164", "yen" => "165", "brvbar"=> "166", "sect" => "167",
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| 92 | "uml" => "168", "copy" => "169", "ordf" => "170", "laquo" => "171",
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| 93 | "not" => "172", "shy" => "173", "reg" => "174", "macr" => "175",
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| 94 | "deg" => "176", "plusmn"=> "177", "sup2" => "178", "sup3" => "179",
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| 95 | "acute" => "180", "micro" => "181", "para" => "182", "middot"=> "183",
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| 96 | "cedil" => "184", "sup1" => "185", "ordm" => "186", "raquo" => "187",
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| 97 | "frac14"=> "188", "frac12"=> "189", "frac34"=> "190", "iquest"=> "191",
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| 98 | "times" => "215", "divide"=> "247");
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| 99 |
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| 100 |
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| 101 |
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| 102 | # standard font to plain text
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| 103 | my %sftotxt = ("32" => " ", "33" => "!", "34" => "\"", "35" => "\#", "36" => "\$",
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| 104 | "37" => "\%", "38" => "&", "39" => "'", "40" => "(", "41" => ")",
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| 105 | "42" => "*", "43" => "+", "44" => ",", "45" => "-", "46" => ".",
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| 106 | "47" => "/", "48" => "0", "49" => "1", "50" => "2", "51" => "3",
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| 107 | "52" => "4", "53" => "5", "54" => "6", "55" => "7", "56" => "8",
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| 108 | "57" => "9", "58" => ":", "59" => ";", "60" => "<", "61" => "=",
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| 109 | "62" => ">", "63" => "?", "64" => "\@", "65" => "A", "66" => "B",
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| 110 | "57" => "9", "58" => ":", "59" => ";", "61" => "=",
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| 111 | "63" => "?", "64" => "\@", "65" => "A", "66" => "B",
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| 112 | "67" => "C", "68" => "D", "69" => "E", "70" => "F", "71" => "G",
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| 113 | "72" => "H", "73" => "I", "74" => "J", "75" => "K", "76" => "L",
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| 114 | "77" => "M", "78" => "N", "79" => "O", "80" => "P", "81" => "Q",
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| 115 | "82" => "R", "83" => "S", "84" => "T", "85" => "U", "86" => "V",
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| 116 | "87" => "W", "88" => "X", "89" => "Y", "90" => "Z", "91" => "[",
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| 117 | "92" => "\\", "93" => "]", "94" => "^", "95" => "_", "96" => "`",
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| 118 | "97" => "a", "98" => "b", "99" => "c", "100" => "d", "101" => "e",
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| 119 | "102" => "f", "103" => "g", "104" => "h", "105" => "i", "106" => "j",
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| 120 | "107" => "k", "108" => "l", "109" => "m", "110" => "n", "111" => "o",
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| 121 | "112" => "p", "113" => "q", "114" => "r", "115" => "s", "116" => "t",
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| 122 | "117" => "u", "118" => "v", "119" => "w", "120" => "x", "121" => "y",
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| 123 | "122" => "z", "123" => "{", "124" => "|", "125" => "}", "126" => "~",
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| 124 | "130" => ",", "131" => "f", "132" => "\"", "133" => "...", "139" => "<",
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| 125 | "140" => "OE", "145" => "'", "146" => "'", "147" => "\"", "148" => "\"",
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| 126 | "149" => "o", "150" => "--", "151" => "-", "152" => "~", "153" => "TM",
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| 127 | "155" => ">", "156" => "oe", "159" => "Y", "160" => " ", "178" => "2",
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| 128 | "179" => "3", "185" => "1", "188" => "1/4", "189" => "1/2", "190" => "3/4",
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| 129 | "192" => "A", "193" => "A", "194" => "A", "195" => "A", "196" => "A",
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| 130 | "197" => "A", "198" => "AE", "199" => "C", "200" => "E", "201" => "E",
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| 131 | "202" => "E", "203" => "E", "204" => "I", "205" => "I", "206" => "I",
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| 132 | "207" => "I", "208" => "D", "209" => "N", "210" => "O", "211" => "O",
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| 133 | "212" => "O", "213" => "O", "214" => "O", "215" => "*", "216" => "O",
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| 134 | "217" => "U", "218" => "U", "219" => "U", "220" => "U", "221" => "Y",
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| 135 | "223" => "ss", "224" => "a", "225" => "a", "226" => "a", "227" => "a",
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| 136 | "228" => "a", "229" => "a", "230" => "ae", "231" => "c", "232" => "e",
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| 137 | "233" => "e", "234" => "e", "235" => "e", "236" => "i", "237" => "i",
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| 138 | "238" => "i", "239" => "i", "241" => "n", "242" => "o", "243" => "o",
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| 139 | "244" => "o", "245" => "o", "246" => "o", "247" => "/", "248" => "o",
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| 140 | "249" => "u", "250" => "u", "251" => "u", "252" => "u", "253" => "y",
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| 141 | "255" => "y", "8218" => ",");
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| 142 |
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| 143 |
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| 144 | my %mime_type = ("ai"=>"application/postscript", "aif"=>"audio/x-aiff",
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| 145 | "aifc"=>"audio/x-aiff", "aiff"=>"audio/x-aiff",
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| 146 | "au"=>"audio/basic", "avi"=>"video/x-msvideo",
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| 147 | "bcpio"=>"application/x-bcpio", "bin"=>"application/octet-stream",
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| 148 | "cdf"=>"application/x-netcdf", "class"=>"application/octet-stream",
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| 149 | "cpio"=>"application/x-cpio", "cpt"=>"application/mac-compactpro",
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| 150 | "csh"=>"application/x-csh", "dcr"=>"application/x-director",
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| 151 | "dir"=>"application/x-director", "dms"=>"application/octet-stream",
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| 152 | "doc"=>"application/msword", "dvi"=>"application/x-dvi",
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| 153 | "dxr"=>"application/x-director", "eps"=>"application/postscript",
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| 154 | "etx"=>"text/x-setext",
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| 155 | "exe"=>"application/octet-stream", "gif"=>"image/gif",
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| 156 | "gtar"=>"application/x-gtar", "hdf"=>"application/x-hdf",
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| 157 | "hqx"=>"application/mac-binhex40", "htm"=>"text/html",
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| 158 | "html"=>"text/html", "ice"=>"x-conference/x-cooltalk",
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| 159 | "ief"=>"image/ief", "jpe"=>"image/jpeg",
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| 160 | "jpeg"=>"image/jpeg", "jpg"=>"image/jpeg",
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| 161 | "kar"=>"audio/midi", "latex"=>"application/x-latex",
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| 162 | "lha"=>"application/octet-stream", "lzh"=>"application/octet-stream",
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| 163 | "man"=>"application/x-troff-man", "mcf"=>"image/vasa",
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| 164 | "me"=>"application/x-troff-me", "mid"=>"audio/midi",
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| 165 | "midi"=>"audio/midi", "mif"=>"application/x-mif",
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| 166 | "mov"=>"video/quicktime", "movie"=>"video/x-sgi-movie",
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| 167 | "mp2"=>"audio/mpeg", "mpe"=>"video/mpeg",
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| 168 | "mpeg"=>"video/mpeg", "mpg"=>"video/mpeg",
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| 169 | "mpga"=>"audio/mpeg", "ms"=>"application/x-troff-ms",
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| 170 | "nc"=>"application/x-netcdf", "oda"=>"application/oda",
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| 171 | "pbm"=>"image/x-portable-bitmap", "pdb"=>"chemical/x-pdb",
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| 172 | "pdf"=>"application/pdf", "pgm"=>"image/x-portable-graymap",
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| 173 | "png"=>"image/png", "pnm"=>"image/x-portable-anymap",
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| 174 | "ppm"=>"image/x-portable-pixmap",
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| 175 | "ppt"=>"application/vnd.ms-powerpoint",
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| 176 | "ps"=>"application/postscript", "qt"=>"video/quicktime",
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| 177 | "ra"=>"audio/x-realaudio", "ram"=>"audio/x-pn-realaudio",
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| 178 | "ras"=>"image/x-cmu-raster", "rgb"=>"image/x-rgb",
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| 179 | "roff"=>"application/x-troff", "rpm"=>"audio/x-pn-realaudio-plugin",
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| 180 | "rtf"=>"application/rtf", "rtx"=>"text/richtext",
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| 181 | "sgm"=>"text/x-sgml", "sgml"=>"text/x-sgml",
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| 182 | "sh"=>"application/x-sh", "shar"=>"application/x-shar",
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| 183 | "sit"=>"application/x-stuffit", "skd"=>"application/x-koan",
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| 184 | "skm"=>"application/x-koan", "skp"=>"application/x-koan",
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| 185 | "skt"=>"application/x-koan", "snd"=>"audio/basic",
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| 186 | "src"=>"application/x-wais-source", "sv4cpio"=>"application/x-sv4cpio",
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| 187 | "sv4crc"=>"application/x-sv4crc", "t"=>"application/x-troff",
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| 188 | "tar"=>"application/x-tar", "tcl"=>"application/x-tcl",
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| 189 | "tex"=>"application/x-tex", "texi"=>"application/x-texinfo",
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| 190 | "texinfo"=>"application/x-texinfo", "tif"=>"image/tiff",
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| 191 | "tiff"=>"image/tiff", "tr"=>"application/x-troff",
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| 192 | "tsv"=>"text/tab-separated-values", "txt"=>"text/plain",
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| 193 | "ustar"=>"application/x-ustar", "vcd"=>"application/x-cdlink",
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| 194 | "vrml"=>"x-world/x-vrml", "wav"=>"audio/x-wav",
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| 195 | "wrl"=>"x-world/x-vrml", "xbm"=>"image/x-xbitmap",
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| 196 | "xls"=>"application/vnd.ms-excel",
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| 197 | "xpm"=>"image/x-xpixmap", "xwd"=>"image/x-xwindowdump",
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| 198 | "xyz"=>"chemical/x-pdb", "zip"=>"application/zip");
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| 199 |
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| 200 |
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| 201 | # returns the character as a raw utf-8 character. It assumes that the
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| 202 | # & and ; have been stripped off the string.
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| 203 | sub getcharequiv {
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| 204 | my ($entity, $convertsymbols, $and_decode) = @_;
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| 205 |
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| 206 | my $char_equiv = undef;
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| 207 |
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| 208 | # a numeric entity
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| 209 | if ($entity =~ /^\#0*(\d+)/) {
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| 210 | my $code=$1;
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| 211 | # non-standard Microsoft breakage, as usual
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| 212 | if ($code < 0x9f) { # code page 1252 uses reserved bytes
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| 213 | if ($code == 0x91) {$code=0x2018} # 145 = single left quote
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| 214 | elsif ($code == 0x92) {$code=0x2019} # 146 = single right quote
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| 215 | elsif ($code == 0x93) {$code=0x201c} # 147 = double left quote
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| 216 | elsif ($code == 0x94) {$code=0x201d} # 148 = double right quote
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| 217 | # ...
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| 218 | }
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| 219 | $char_equiv = &unicode::unicode2utf8([$code]);
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| 220 | }
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| 221 |
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| 222 | # a named character entity
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| 223 | elsif (defined $charnetosf{$entity}) {
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| 224 | $char_equiv = &unicode::unicode2utf8([$charnetosf{$entity}]);
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| 225 | }
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| 226 |
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| 227 | # a named symbol entity
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| 228 | elsif ($convertsymbols && defined $symnetosf{$entity}) {
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| 229 | $char_equiv = &unicode::unicode2utf8([$symnetosf{$entity}]);
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| 230 | }
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| 231 |
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| 232 | if (!defined $char_equiv) {
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| 233 | return "&$entity;"; # unknown character
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| 234 | }
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| 235 | else {
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| 236 | if ((defined $and_decode) && ($and_decode)) {
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| 237 | $char_equiv = Encode::decode("utf8",$char_equiv);
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| 238 | }
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| 239 | return $char_equiv;
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| 240 | }
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| 241 | }
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| 242 |
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| 243 | # convert character entities from named equivalents to html font
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| 244 | sub convertcharentities {
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| 245 | # args: the text that you want to convert
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| 246 |
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| 247 | $_[0] =~ s/&([^;]+);/&getcharequiv($1,0)/gse;
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| 248 | }
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| 249 |
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| 250 | # convert any entities from named equivalents to html font
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| 251 | sub convertallentities {
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| 252 | # args: the text that you want to convert
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| 253 |
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| 254 | $_[0] =~ s/&([^;]+);/&getcharequiv($1,1)/gse;
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| 255 | }
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| 256 |
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| 257 | sub html2txt {
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| 258 | # args: the text that you want converted to ascii,
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| 259 | # and whether to strip out sgml tags
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| 260 |
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| 261 | # strip out sgml tags if needed
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| 262 | $_[0] =~ s/<[^>]*>//g if $_[1];
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| 263 |
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| 264 | # convert the char entities to the standard html font
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| 265 | &convertcharentities($_[0]);
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| 266 |
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| 267 | # convert the html character set to a plain ascii character set
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| 268 | my $pos = 0;
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| 269 | while ($pos < length($_[0])) {
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| 270 | my $charnum = ord(substr($_[0], $pos, 1));
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| 271 | if ($charnum >= 32) { # only convert characters above #32
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| 272 | my $replacechars = " ";
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| 273 | $replacechars = $sftotxt{$charnum} if defined $sftotxt{$charnum};
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| 274 | substr($_[0], $pos, 1) = $replacechars;
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| 275 | $pos += length ($replacechars);
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| 276 |
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| 277 | } else {
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| 278 | $pos ++;
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| 279 | }
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| 280 | }
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| 281 | }
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| 282 |
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| 283 |
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| 284 | # look for mime.types (eg in /etc, or apache/conf directories), or have a look
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| 285 | # at <ftp://ftp.iana.org/in-notes/iana/assignments/media-types/> for defaults.
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| 286 | sub guess_mime_type {
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| 287 | my ($filename) = @_;
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| 288 | # make the filename lowercase, since the mimetypes hashmap looks for lowercase
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| 289 | $filename = lc($filename);
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| 290 |
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| 291 | my ($fileext) = $filename =~ /\.(\w+)$/;
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| 292 | return "unknown" unless defined $fileext;
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| 293 |
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| 294 | # else
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| 295 | my $mimetype = $mime_type{$fileext};
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| 296 | return $mimetype if (defined $mimetype);
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| 297 |
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| 298 | return "unknown";
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| 299 | }
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| 300 |
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| 301 |
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| 302 | 1;
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