library/SimplePie/Content/Type/Sniffer.php Quellcode

Sniffer.php
gehe zur Dokumentation dieser Datei
1 <?php
60 class SimplePie_Content_Type_Sniffer
61 {
67  var $file;
68 
74  public function __construct($file)
75  {
76  $this->file = $file;
77  }
78 
84  public function get_type()
85  {
86  if (isset($this->file->headers['content-type']))
87  {
88  if (!isset($this->file->headers['content-encoding'])
89  && ($this->file->headers['content-type'] === 'text/plain'
90  || $this->file->headers['content-type'] === 'text/plain; charset=ISO-8859-1'
91  || $this->file->headers['content-type'] === 'text/plain; charset=iso-8859-1'
92  || $this->file->headers['content-type'] === 'text/plain; charset=UTF-8'))
93  {
94  return $this->text_or_binary();
95  }
96 
97  if (($pos = strpos($this->file->headers['content-type'], ';')) !== false)
98  {
99  $official = substr($this->file->headers['content-type'], 0, $pos);
100  }
101  else
102  {
103  $official = $this->file->headers['content-type'];
104  }
105  $official = trim(strtolower($official));
106 
107  if ($official === 'unknown/unknown'
108  || $official === 'application/unknown')
109  {
110  return $this->unknown();
111  }
112  elseif (substr($official, -4) === '+xml'
113  || $official === 'text/xml'
114  || $official === 'application/xml')
115  {
116  return $official;
117  }
118  elseif (substr($official, 0, 6) === 'image/')
119  {
120  if ($return = $this->image())
121  {
122  return $return;
123  }
124  else
125  {
126  return $official;
127  }
128  }
129  elseif ($official === 'text/html')
130  {
131  return $this->feed_or_html();
132  }
133  else
134  {
135  return $official;
136  }
137  }
138  else
139  {
140  return $this->unknown();
141  }
142  }
143 
149  public function text_or_binary()
150  {
151  if (substr($this->file->body, 0, 2) === "\xFE\xFF"
152  || substr($this->file->body, 0, 2) === "\xFF\xFE"
153  || substr($this->file->body, 0, 4) === "\x00\x00\xFE\xFF"
154  || substr($this->file->body, 0, 3) === "\xEF\xBB\xBF")
155  {
156  return 'text/plain';
157  }
158  elseif (preg_match('/[\x00-\x08\x0E-\x1A\x1C-\x1F]/', $this->file->body))
159  {
160  return 'application/octect-stream';
161  }
162  else
163  {
164  return 'text/plain';
165  }
166  }
167 
173  public function unknown()
174  {
175  $ws = strspn($this->file->body, "\x09\x0A\x0B\x0C\x0D\x20");
176  if (strtolower(substr($this->file->body, $ws, 14)) === '<!doctype html'
177  || strtolower(substr($this->file->body, $ws, 5)) === '<html'
178  || strtolower(substr($this->file->body, $ws, 7)) === '<script')
179  {
180  return 'text/html';
181  }
182  elseif (substr($this->file->body, 0, 5) === '%PDF-')
183  {
184  return 'application/pdf';
185  }
186  elseif (substr($this->file->body, 0, 11) === '%!PS-Adobe-')
187  {
188  return 'application/postscript';
189  }
190  elseif (substr($this->file->body, 0, 6) === 'GIF87a'
191  || substr($this->file->body, 0, 6) === 'GIF89a')
192  {
193  return 'image/gif';
194  }
195  elseif (substr($this->file->body, 0, 8) === "\x89\x50\x4E\x47\x0D\x0A\x1A\x0A")
196  {
197  return 'image/png';
198  }
199  elseif (substr($this->file->body, 0, 3) === "\xFF\xD8\xFF")
200  {
201  return 'image/jpeg';
202  }
203  elseif (substr($this->file->body, 0, 2) === "\x42\x4D")
204  {
205  return 'image/bmp';
206  }
207  elseif (substr($this->file->body, 0, 4) === "\x00\x00\x01\x00")
208  {
209  return 'image/vnd.microsoft.icon';
210  }
211  else
212  {
213  return $this->text_or_binary();
214  }
215  }
216 
222  public function image()
223  {
224  if (substr($this->file->body, 0, 6) === 'GIF87a'
225  || substr($this->file->body, 0, 6) === 'GIF89a')
226  {
227  return 'image/gif';
228  }
229  elseif (substr($this->file->body, 0, 8) === "\x89\x50\x4E\x47\x0D\x0A\x1A\x0A")
230  {
231  return 'image/png';
232  }
233  elseif (substr($this->file->body, 0, 3) === "\xFF\xD8\xFF")
234  {
235  return 'image/jpeg';
236  }
237  elseif (substr($this->file->body, 0, 2) === "\x42\x4D")
238  {
239  return 'image/bmp';
240  }
241  elseif (substr($this->file->body, 0, 4) === "\x00\x00\x01\x00")
242  {
243  return 'image/vnd.microsoft.icon';
244  }
245  else
246  {
247  return false;
248  }
249  }
250 
256  public function feed_or_html()
257  {
258  $len = strlen($this->file->body);
259  $pos = strspn($this->file->body, "\x09\x0A\x0D\x20");
260 
261  while ($pos < $len)
262  {
263  switch ($this->file->body[$pos])
264  {
265  case "\x09":
266  case "\x0A":
267  case "\x0D":
268  case "\x20":
269  $pos += strspn($this->file->body, "\x09\x0A\x0D\x20", $pos);
270  continue 2;
271 
272  case '<':
273  $pos++;
274  break;
275 
276  default:
277  return 'text/html';
278  }
279 
280  if (substr($this->file->body, $pos, 3) === '!--')
281  {
282  $pos += 3;
283  if ($pos < $len && ($pos = strpos($this->file->body, '-->', $pos)) !== false)
284  {
285  $pos += 3;
286  }
287  else
288  {
289  return 'text/html';
290  }
291  }
292  elseif (substr($this->file->body, $pos, 1) === '!')
293  {
294  if ($pos < $len && ($pos = strpos($this->file->body, '>', $pos)) !== false)
295  {
296  $pos++;
297  }
298  else
299  {
300  return 'text/html';
301  }
302  }
303  elseif (substr($this->file->body, $pos, 1) === '?')
304  {
305  if ($pos < $len && ($pos = strpos($this->file->body, '?>', $pos)) !== false)
306  {
307  $pos += 2;
308  }
309  else
310  {
311  return 'text/html';
312  }
313  }
314  elseif (substr($this->file->body, $pos, 3) === 'rss'
315  || substr($this->file->body, $pos, 7) === 'rdf:RDF')
316  {
317  return 'application/rss+xml';
318  }
319  elseif (substr($this->file->body, $pos, 4) === 'feed')
320  {
321  return 'application/atom+xml';
322  }
323  else
324  {
325  return 'text/html';
326  }
327  }
328 
329  return 'text/html';
330  }
331 }
332 




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Erzeugt am Son Aug 4 2013 10:11:16 für MyOOS [Die Shop-Lösung] von   doxygen 1.8.4