root / drupal7 / sites / all / libraries / simplepie / library / SimplePie / Content / Type / Sniffer.php @ 41cc1b08
1 | 41cc1b08 | Assos Assos | <?php
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2 | /**
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3 | * SimplePie
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4 | *
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5 | * A PHP-Based RSS and Atom Feed Framework.
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6 | * Takes the hard work out of managing a complete RSS/Atom solution.
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7 | *
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8 | * Copyright (c) 2004-2012, Ryan Parman, Geoffrey Sneddon, Ryan McCue, and contributors
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9 | * All rights reserved.
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10 | *
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11 | * Redistribution and use in source and binary forms, with or without modification, are
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12 | * permitted provided that the following conditions are met:
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13 | *
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14 | * * Redistributions of source code must retain the above copyright notice, this list of
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15 | * conditions and the following disclaimer.
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16 | *
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17 | * * Redistributions in binary form must reproduce the above copyright notice, this list
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18 | * of conditions and the following disclaimer in the documentation and/or other materials
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19 | * provided with the distribution.
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20 | *
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21 | * * Neither the name of the SimplePie Team nor the names of its contributors may be used
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22 | * to endorse or promote products derived from this software without specific prior
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23 | * written permission.
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24 | *
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25 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS
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26 | * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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27 | * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS
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28 | * AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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29 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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30 | * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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31 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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32 | * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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33 | * POSSIBILITY OF SUCH DAMAGE.
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34 | *
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35 | * @package SimplePie
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36 | * @version 1.3.1
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37 | * @copyright 2004-2012 Ryan Parman, Geoffrey Sneddon, Ryan McCue
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38 | * @author Ryan Parman
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39 | * @author Geoffrey Sneddon
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40 | * @author Ryan McCue
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41 | * @link http://simplepie.org/ SimplePie
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42 | * @license http://www.opensource.org/licenses/bsd-license.php BSD License
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43 | */
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44 | |||
45 | |||
46 | /**
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47 | * Content-type sniffing
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48 | *
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49 | * Based on the rules in http://tools.ietf.org/html/draft-abarth-mime-sniff-06
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50 | *
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51 | * This is used since we can't always trust Content-Type headers, and is based
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52 | * upon the HTML5 parsing rules.
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53 | *
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54 | *
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55 | * This class can be overloaded with {@see SimplePie::set_content_type_sniffer_class()}
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56 | *
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57 | * @package SimplePie
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58 | * @subpackage HTTP
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59 | */
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60 | class SimplePie_Content_Type_Sniffer |
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61 | { |
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62 | /**
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63 | * File object
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64 | *
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65 | * @var SimplePie_File
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66 | */
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67 | var $file; |
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68 | |||
69 | /**
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70 | * Create an instance of the class with the input file
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71 | *
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72 | * @param SimplePie_Content_Type_Sniffer $file Input file
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73 | */
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74 | public function __construct($file) |
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75 | { |
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76 | $this->file = $file; |
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77 | } |
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78 | |||
79 | /**
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80 | * Get the Content-Type of the specified file
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81 | *
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82 | * @return string Actual Content-Type
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83 | */
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84 | public function get_type() |
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85 | { |
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86 | if (isset($this->file->headers['content-type'])) |
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87 | { |
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88 | if (!isset($this->file->headers['content-encoding']) |
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89 | && ($this->file->headers['content-type'] === 'text/plain' |
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90 | || $this->file->headers['content-type'] === 'text/plain; charset=ISO-8859-1' |
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91 | || $this->file->headers['content-type'] === 'text/plain; charset=iso-8859-1' |
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92 | || $this->file->headers['content-type'] === 'text/plain; charset=UTF-8')) |
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93 | { |
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94 | return $this->text_or_binary(); |
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95 | } |
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96 | |||
97 | if (($pos = strpos($this->file->headers['content-type'], ';')) !== false) |
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98 | { |
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99 | $official = substr($this->file->headers['content-type'], 0, $pos); |
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100 | } |
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101 | else
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102 | { |
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103 | $official = $this->file->headers['content-type']; |
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104 | } |
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105 | $official = trim(strtolower($official)); |
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106 | |||
107 | if ($official === 'unknown/unknown' |
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108 | || $official === 'application/unknown') |
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109 | { |
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110 | return $this->unknown(); |
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111 | } |
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112 | elseif (substr($official, -4) === '+xml' |
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113 | || $official === 'text/xml' |
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114 | || $official === 'application/xml') |
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115 | { |
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116 | return $official; |
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117 | } |
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118 | elseif (substr($official, 0, 6) === 'image/') |
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119 | { |
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120 | if ($return = $this->image()) |
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121 | { |
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122 | return $return; |
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123 | } |
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124 | else
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125 | { |
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126 | return $official; |
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127 | } |
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128 | } |
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129 | elseif ($official === 'text/html') |
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130 | { |
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131 | return $this->feed_or_html(); |
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132 | } |
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133 | else
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134 | { |
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135 | return $official; |
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136 | } |
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137 | } |
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138 | else
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139 | { |
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140 | return $this->unknown(); |
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141 | } |
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142 | } |
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143 | |||
144 | /**
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145 | * Sniff text or binary
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146 | *
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147 | * @return string Actual Content-Type
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148 | */
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149 | public function text_or_binary() |
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150 | { |
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151 | if (substr($this->file->body, 0, 2) === "\xFE\xFF" |
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152 | || substr($this->file->body, 0, 2) === "\xFF\xFE" |
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153 | || substr($this->file->body, 0, 4) === "\x00\x00\xFE\xFF" |
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154 | || substr($this->file->body, 0, 3) === "\xEF\xBB\xBF") |
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155 | { |
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156 | return 'text/plain'; |
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157 | } |
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158 | elseif (preg_match('/[\x00-\x08\x0E-\x1A\x1C-\x1F]/', $this->file->body)) |
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159 | { |
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160 | return 'application/octect-stream'; |
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161 | } |
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162 | else
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163 | { |
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164 | return 'text/plain'; |
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165 | } |
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166 | } |
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167 | |||
168 | /**
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169 | * Sniff unknown
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170 | *
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171 | * @return string Actual Content-Type
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172 | */
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173 | public function unknown() |
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174 | { |
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175 | $ws = strspn($this->file->body, "\x09\x0A\x0B\x0C\x0D\x20"); |
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176 | if (strtolower(substr($this->file->body, $ws, 14)) === '<!doctype html' |
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177 | || strtolower(substr($this->file->body, $ws, 5)) === '<html' |
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178 | || strtolower(substr($this->file->body, $ws, 7)) === '<script') |
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179 | { |
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180 | return 'text/html'; |
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181 | } |
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182 | elseif (substr($this->file->body, 0, 5) === '%PDF-') |
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183 | { |
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184 | return 'application/pdf'; |
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185 | } |
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186 | elseif (substr($this->file->body, 0, 11) === '%!PS-Adobe-') |
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187 | { |
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188 | return 'application/postscript'; |
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189 | } |
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190 | elseif (substr($this->file->body, 0, 6) === 'GIF87a' |
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191 | || substr($this->file->body, 0, 6) === 'GIF89a') |
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192 | { |
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193 | return 'image/gif'; |
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194 | } |
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195 | elseif (substr($this->file->body, 0, 8) === "\x89\x50\x4E\x47\x0D\x0A\x1A\x0A") |
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196 | { |
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197 | return 'image/png'; |
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198 | } |
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199 | elseif (substr($this->file->body, 0, 3) === "\xFF\xD8\xFF") |
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200 | { |
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201 | return 'image/jpeg'; |
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202 | } |
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203 | elseif (substr($this->file->body, 0, 2) === "\x42\x4D") |
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204 | { |
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205 | return 'image/bmp'; |
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206 | } |
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207 | elseif (substr($this->file->body, 0, 4) === "\x00\x00\x01\x00") |
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208 | { |
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209 | return 'image/vnd.microsoft.icon'; |
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210 | } |
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211 | else
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212 | { |
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213 | return $this->text_or_binary(); |
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214 | } |
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215 | } |
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216 | |||
217 | /**
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218 | * Sniff images
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219 | *
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220 | * @return string Actual Content-Type
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221 | */
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222 | public function image() |
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223 | { |
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224 | if (substr($this->file->body, 0, 6) === 'GIF87a' |
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225 | || substr($this->file->body, 0, 6) === 'GIF89a') |
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226 | { |
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227 | return 'image/gif'; |
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228 | } |
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229 | elseif (substr($this->file->body, 0, 8) === "\x89\x50\x4E\x47\x0D\x0A\x1A\x0A") |
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230 | { |
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231 | return 'image/png'; |
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232 | } |
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233 | elseif (substr($this->file->body, 0, 3) === "\xFF\xD8\xFF") |
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234 | { |
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235 | return 'image/jpeg'; |
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236 | } |
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237 | elseif (substr($this->file->body, 0, 2) === "\x42\x4D") |
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238 | { |
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239 | return 'image/bmp'; |
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240 | } |
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241 | elseif (substr($this->file->body, 0, 4) === "\x00\x00\x01\x00") |
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242 | { |
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243 | return 'image/vnd.microsoft.icon'; |
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244 | } |
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245 | else
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246 | { |
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247 | return false; |
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248 | } |
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249 | } |
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250 | |||
251 | /**
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252 | * Sniff HTML
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253 | *
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254 | * @return string Actual Content-Type
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255 | */
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256 | public function feed_or_html() |
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257 | { |
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258 | $len = strlen($this->file->body); |
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259 | $pos = strspn($this->file->body, "\x09\x0A\x0D\x20"); |
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260 | |||
261 | while ($pos < $len) |
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262 | { |
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263 | switch ($this->file->body[$pos]) |
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264 | { |
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265 | case "\x09": |
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266 | case "\x0A": |
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267 | case "\x0D": |
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268 | case "\x20": |
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269 | $pos += strspn($this->file->body, "\x09\x0A\x0D\x20", $pos); |
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270 | continue 2; |
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271 | |||
272 | case '<': |
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273 | $pos++;
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274 | break;
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275 | |||
276 | default:
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277 | return 'text/html'; |
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278 | } |
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279 | |||
280 | if (substr($this->file->body, $pos, 3) === '!--') |
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281 | { |
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282 | $pos += 3; |
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283 | if ($pos < $len && ($pos = strpos($this->file->body, '-->', $pos)) !== false) |
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284 | { |
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285 | $pos += 3; |
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286 | } |
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287 | else
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288 | { |
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289 | return 'text/html'; |
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290 | } |
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291 | } |
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292 | elseif (substr($this->file->body, $pos, 1) === '!') |
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293 | { |
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294 | if ($pos < $len && ($pos = strpos($this->file->body, '>', $pos)) !== false) |
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295 | { |
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296 | $pos++;
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297 | } |
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298 | else
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299 | { |
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300 | return 'text/html'; |
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301 | } |
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302 | } |
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303 | elseif (substr($this->file->body, $pos, 1) === '?') |
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304 | { |
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305 | if ($pos < $len && ($pos = strpos($this->file->body, '?>', $pos)) !== false) |
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306 | { |
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307 | $pos += 2; |
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308 | } |
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309 | else
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310 | { |
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311 | return 'text/html'; |
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312 | } |
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313 | } |
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314 | elseif (substr($this->file->body, $pos, 3) === 'rss' |
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315 | || substr($this->file->body, $pos, 7) === 'rdf:RDF') |
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316 | { |
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317 | return 'application/rss+xml'; |
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318 | } |
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319 | elseif (substr($this->file->body, $pos, 4) === 'feed') |
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320 | { |
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321 | return 'application/atom+xml'; |
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322 | } |
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323 | else
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324 | { |
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325 | return 'text/html'; |
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326 | } |
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327 | } |
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328 | |||
329 | return 'text/html'; |
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330 | } |
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331 | } |