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phpthumb.functions.php
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1 <?php
4 // available at http://phpthumb.sourceforge.net ///
7 // phpthumb.functions.php - general support functions //
8 // ///
10 
11 class phpthumb_functions {
12 
13  static function user_function_exists($functionname) {
14  if (function_exists('get_defined_functions')) {
15  static $get_defined_functions = array();
16  if (empty($get_defined_functions)) {
17  $get_defined_functions = get_defined_functions();
18  }
19  return in_array(strtolower($functionname), $get_defined_functions['user']);
20  }
21  return function_exists($functionname);
22  }
23 
24 
25  static function builtin_function_exists($functionname) {
26  if (function_exists('get_defined_functions')) {
27  static $get_defined_functions = array();
28  if (empty($get_defined_functions)) {
29  $get_defined_functions = get_defined_functions();
30  }
31  return in_array(strtolower($functionname), $get_defined_functions['internal']);
32  }
33  return function_exists($functionname);
34  }
35 
36 
37  static function version_compare_replacement_sub($version1, $version2, $operator='') {
38  // If you specify the third optional operator argument, you can test for a particular relationship.
39  // The possible operators are: <, lt, <=, le, >, gt, >=, ge, ==, =, eq, !=, <>, ne respectively.
40  // Using this argument, the function will return 1 if the relationship is the one specified by the operator, 0 otherwise.
41 
42  // If a part contains special version strings these are handled in the following order:
43  // (any string not found in this list) < (dev) < (alpha = a) < (beta = b) < (RC = rc) < (#) < (pl = p)
44  static $versiontype_lookup = array();
45  if (empty($versiontype_lookup)) {
46  $versiontype_lookup['dev'] = 10001;
47  $versiontype_lookup['a'] = 10002;
48  $versiontype_lookup['alpha'] = 10002;
49  $versiontype_lookup['b'] = 10003;
50  $versiontype_lookup['beta'] = 10003;
51  $versiontype_lookup['RC'] = 10004;
52  $versiontype_lookup['rc'] = 10004;
53  $versiontype_lookup['#'] = 10005;
54  $versiontype_lookup['pl'] = 10006;
55  $versiontype_lookup['p'] = 10006;
56  }
57  $version1 = (isset($versiontype_lookup[$version1]) ? $versiontype_lookup[$version1] : $version1);
58  $version2 = (isset($versiontype_lookup[$version2]) ? $versiontype_lookup[$version2] : $version2);
59 
60  switch ($operator) {
61  case '<':
62  case 'lt':
63  return intval($version1 < $version2);
64  break;
65  case '<=':
66  case 'le':
67  return intval($version1 <= $version2);
68  break;
69  case '>':
70  case 'gt':
71  return intval($version1 > $version2);
72  break;
73  case '>=':
74  case 'ge':
75  return intval($version1 >= $version2);
76  break;
77  case '==':
78  case '=':
79  case 'eq':
80  return intval($version1 == $version2);
81  break;
82  case '!=':
83  case '<>':
84  case 'ne':
85  return intval($version1 != $version2);
86  break;
87  }
88  if ($version1 == $version2) {
89  return 0;
90  } elseif ($version1 < $version2) {
91  return -1;
92  }
93  return 1;
94  }
95 
96 
97  static function version_compare_replacement($version1, $version2, $operator='') {
98  if (function_exists('version_compare')) {
99  // built into PHP v4.1.0+
100  return version_compare($version1, $version2, $operator);
101  }
102 
103  // The function first replaces _, - and + with a dot . in the version strings
104  $version1 = strtr($version1, '_-+', '...');
105  $version2 = strtr($version2, '_-+', '...');
106 
107  // and also inserts dots . before and after any non number so that for example '4.3.2RC1' becomes '4.3.2.RC.1'.
108  // Then it splits the results like if you were using explode('.',$ver). Then it compares the parts starting from left to right.
109  $version1 = preg_replace('#([0-9]+)([A-Z]+)([0-9]+)#i', "$1.$2.$3", $version1);
110  $version2 = preg_replace('#([0-9]+)([A-Z]+)([0-9]+)#i', "$1.$2.$3", $version2);
111 
112  $parts1 = explode('.', $version1);
113  $parts2 = explode('.', $version1);
114  $parts_count = max(count($parts1), count($parts2));
115  for ($i = 0; $i < $parts_count; $i++) {
116  $comparison = phpthumb_functions::version_compare_replacement_sub($version1, $version2, $operator);
117  if ($comparison != 0) {
118  return $comparison;
119  }
120  }
121  return 0;
122  }
123 
124 
125  static function phpinfo_array() {
126  static $phpinfo_array = array();
127  if (empty($phpinfo_array)) {
128  ob_start();
129  phpinfo();
130  $phpinfo = ob_get_contents();
131  ob_end_clean();
132  $phpinfo_array = explode("\n", $phpinfo);
133  }
134  return $phpinfo_array;
135  }
136 
137 
138  static function exif_info() {
139  static $exif_info = array();
140  if (empty($exif_info)) {
141  // based on code by johnschaefer at gmx dot de
142  // from PHP help on gd_info()
143  $exif_info = array(
144  'EXIF Support' => '',
145  'EXIF Version' => '',
146  'Supported EXIF Version' => '',
147  'Supported filetypes' => ''
148  );
149  $phpinfo_array = phpthumb_functions::phpinfo_array();
150  foreach ($phpinfo_array as $line) {
151  $line = trim(strip_tags($line));
152  foreach ($exif_info as $key => $value) {
153  if (strpos($line, $key) === 0) {
154  $newvalue = trim(str_replace($key, '', $line));
155  $exif_info[$key] = $newvalue;
156  }
157  }
158  }
159  }
160  return $exif_info;
161  }
162 
163 
164  static function ImageTypeToMIMEtype($imagetype) {
165  if (function_exists('image_type_to_mime_type') && ($imagetype >= 1) && ($imagetype <= 16)) {
166  // PHP v4.3.0+
167  return image_type_to_mime_type($imagetype);
168  }
169  static $image_type_to_mime_type = array(
170  1 => 'image/gif', // IMAGETYPE_GIF
171  2 => 'image/jpeg', // IMAGETYPE_JPEG
172  3 => 'image/png', // IMAGETYPE_PNG
173  4 => 'application/x-shockwave-flash', // IMAGETYPE_SWF
174  5 => 'image/psd', // IMAGETYPE_PSD
175  6 => 'image/bmp', // IMAGETYPE_BMP
176  7 => 'image/tiff', // IMAGETYPE_TIFF_II (intel byte order)
177  8 => 'image/tiff', // IMAGETYPE_TIFF_MM (motorola byte order)
178  9 => 'application/octet-stream', // IMAGETYPE_JPC
179  10 => 'image/jp2', // IMAGETYPE_JP2
180  11 => 'application/octet-stream', // IMAGETYPE_JPX
181  12 => 'application/octet-stream', // IMAGETYPE_JB2
182  13 => 'application/x-shockwave-flash', // IMAGETYPE_SWC
183  14 => 'image/iff', // IMAGETYPE_IFF
184  15 => 'image/vnd.wap.wbmp', // IMAGETYPE_WBMP
185  16 => 'image/xbm', // IMAGETYPE_XBM
186 
187  'gif' => 'image/gif', // IMAGETYPE_GIF
188  'jpg' => 'image/jpeg', // IMAGETYPE_JPEG
189  'jpeg' => 'image/jpeg', // IMAGETYPE_JPEG
190  'png' => 'image/png', // IMAGETYPE_PNG
191  'bmp' => 'image/bmp', // IMAGETYPE_BMP
192  'ico' => 'image/x-icon',
193  );
194 
195  return (isset($image_type_to_mime_type[$imagetype]) ? $image_type_to_mime_type[$imagetype] : false);
196  }
197 
198 
199  static function TranslateWHbyAngle($width, $height, $angle) {
200  if (($angle % 180) == 0) {
201  return array($width, $height);
202  }
203  $newwidth = (abs(sin(deg2rad($angle))) * $height) + (abs(cos(deg2rad($angle))) * $width);
204  $newheight = (abs(sin(deg2rad($angle))) * $width) + (abs(cos(deg2rad($angle))) * $height);
205  return array($newwidth, $newheight);
206  }
207 
208  static function HexCharDisplay($string) {
209  $len = strlen($string);
210  $output = '';
211  for ($i = 0; $i < $len; $i++) {
212  $output .= ' 0x'.str_pad(dechex(ord($string{$i})), 2, '0', STR_PAD_LEFT);
213  }
214  return $output;
215  }
216 
217 
218  static function IsHexColor($HexColorString) {
219  return preg_match('#^[0-9A-F]{6}$#i', $HexColorString);
220  }
221 
222 
223  static function ImageColorAllocateAlphaSafe(&$gdimg_hexcolorallocate, $R, $G, $B, $alpha=false) {
224  if (phpthumb_functions::version_compare_replacement(phpversion(), '4.3.2', '>=') && ($alpha !== false)) {
225  return ImageColorAllocateAlpha($gdimg_hexcolorallocate, $R, $G, $B, intval($alpha));
226  } else {
227  return ImageColorAllocate($gdimg_hexcolorallocate, $R, $G, $B);
228  }
229  }
230 
231  static function ImageHexColorAllocate(&$gdimg_hexcolorallocate, $HexColorString, $dieOnInvalid=false, $alpha=false) {
232  if (!is_resource($gdimg_hexcolorallocate)) {
233  die('$gdimg_hexcolorallocate is not a GD resource in ImageHexColorAllocate()');
234  }
235  if (phpthumb_functions::IsHexColor($HexColorString)) {
236  $R = hexdec(substr($HexColorString, 0, 2));
237  $G = hexdec(substr($HexColorString, 2, 2));
238  $B = hexdec(substr($HexColorString, 4, 2));
239  return phpthumb_functions::ImageColorAllocateAlphaSafe($gdimg_hexcolorallocate, $R, $G, $B, $alpha);
240  }
241  if ($dieOnInvalid) {
242  die('Invalid hex color string: "'.$HexColorString.'"');
243  }
244  return ImageColorAllocate($gdimg_hexcolorallocate, 0x00, 0x00, 0x00);
245  }
246 
247 
248  static function HexColorXOR($hexcolor) {
249  return strtoupper(str_pad(dechex(~hexdec($hexcolor) & 0xFFFFFF), 6, '0', STR_PAD_LEFT));
250  }
251 
252 
253  static function GetPixelColor(&$img, $x, $y) {
254  if (!is_resource($img)) {
255  return false;
256  }
257  return @ImageColorsForIndex($img, @ImageColorAt($img, $x, $y));
258  }
259 
260 
261  static function PixelColorDifferencePercent($currentPixel, $targetPixel) {
262  $diff = 0;
263  foreach ($targetPixel as $channel => $currentvalue) {
264  $diff = max($diff, (max($currentPixel[$channel], $targetPixel[$channel]) - min($currentPixel[$channel], $targetPixel[$channel])) / 255);
265  }
266  return $diff * 100;
267  }
268 
269  static function GrayscaleValue($r, $g, $b) {
270  return round(($r * 0.30) + ($g * 0.59) + ($b * 0.11));
271  }
272 
273 
274  static function GrayscalePixel($OriginalPixel) {
275  $gray = phpthumb_functions::GrayscaleValue($OriginalPixel['red'], $OriginalPixel['green'], $OriginalPixel['blue']);
276  return array('red'=>$gray, 'green'=>$gray, 'blue'=>$gray);
277  }
278 
279 
280  static function GrayscalePixelRGB($rgb) {
281  $r = ($rgb >> 16) & 0xFF;
282  $g = ($rgb >> 8) & 0xFF;
283  $b = $rgb & 0xFF;
284  return ($r * 0.299) + ($g * 0.587) + ($b * 0.114);
285  }
286 
287 
288  static function ScaleToFitInBox($width, $height, $maxwidth=null, $maxheight=null, $allow_enlarge=true, $allow_reduce=true) {
289  $maxwidth = (is_null($maxwidth) ? $width : $maxwidth);
290  $maxheight = (is_null($maxheight) ? $height : $maxheight);
291  $scale_x = 1;
292  $scale_y = 1;
293  if (($width > $maxwidth) || ($width < $maxwidth)) {
294  $scale_x = ($maxwidth / $width);
295  }
296  if (($height > $maxheight) || ($height < $maxheight)) {
297  $scale_y = ($maxheight / $height);
298  }
299  $scale = min($scale_x, $scale_y);
300  if (!$allow_enlarge) {
301  $scale = min($scale, 1);
302  }
303  if (!$allow_reduce) {
304  $scale = max($scale, 1);
305  }
306  return $scale;
307  }
308 
309  static function ImageCopyResampleBicubic($dst_img, $src_img, $dst_x, $dst_y, $src_x, $src_y, $dst_w, $dst_h, $src_w, $src_h) {
310  // ron at korving dot demon dot nl
311  // http://www.php.net/imagecopyresampled
312 
313  $scaleX = ($src_w - 1) / $dst_w;
314  $scaleY = ($src_h - 1) / $dst_h;
315 
316  $scaleX2 = $scaleX / 2.0;
317  $scaleY2 = $scaleY / 2.0;
318 
319  $isTrueColor = ImageIsTrueColor($src_img);
320 
321  for ($y = $src_y; $y < $src_y + $dst_h; $y++) {
322  $sY = $y * $scaleY;
323  $siY = (int) $sY;
324  $siY2 = (int) $sY + $scaleY2;
325 
326  for ($x = $src_x; $x < $src_x + $dst_w; $x++) {
327  $sX = $x * $scaleX;
328  $siX = (int) $sX;
329  $siX2 = (int) $sX + $scaleX2;
330 
331  if ($isTrueColor) {
332 
333  $c1 = ImageColorAt($src_img, $siX, $siY2);
334  $c2 = ImageColorAt($src_img, $siX, $siY);
335  $c3 = ImageColorAt($src_img, $siX2, $siY2);
336  $c4 = ImageColorAt($src_img, $siX2, $siY);
337 
338  $r = (( $c1 + $c2 + $c3 + $c4 ) >> 2) & 0xFF0000;
339  $g = ((($c1 & 0x00FF00) + ($c2 & 0x00FF00) + ($c3 & 0x00FF00) + ($c4 & 0x00FF00)) >> 2) & 0x00FF00;
340  $b = ((($c1 & 0x0000FF) + ($c2 & 0x0000FF) + ($c3 & 0x0000FF) + ($c4 & 0x0000FF)) >> 2);
341 
342  } else {
343 
344  $c1 = ImageColorsForIndex($src_img, ImageColorAt($src_img, $siX, $siY2));
345  $c2 = ImageColorsForIndex($src_img, ImageColorAt($src_img, $siX, $siY));
346  $c3 = ImageColorsForIndex($src_img, ImageColorAt($src_img, $siX2, $siY2));
347  $c4 = ImageColorsForIndex($src_img, ImageColorAt($src_img, $siX2, $siY));
348 
349  $r = ($c1['red'] + $c2['red'] + $c3['red'] + $c4['red'] ) << 14;
350  $g = ($c1['green'] + $c2['green'] + $c3['green'] + $c4['green']) << 6;
351  $b = ($c1['blue'] + $c2['blue'] + $c3['blue'] + $c4['blue'] ) >> 2;
352 
353  }
354  ImageSetPixel($dst_img, $dst_x + $x - $src_x, $dst_y + $y - $src_y, $r+$g+$b);
355  }
356  }
357  return true;
358  }
359 
360 
361  static function ImageCreateFunction($x_size, $y_size) {
362  $ImageCreateFunction = 'ImageCreate';
363  if (phpthumb_functions::gd_version() >= 2.0) {
364  $ImageCreateFunction = 'ImageCreateTrueColor';
365  }
366  if (!function_exists($ImageCreateFunction)) {
367  return phpthumb::ErrorImage($ImageCreateFunction.'() does not exist - no GD support?');
368  }
369  if (($x_size <= 0) || ($y_size <= 0)) {
370  return phpthumb::ErrorImage('Invalid image dimensions: '.$ImageCreateFunction.'('.$x_size.', '.$y_size.')');
371  }
372  return $ImageCreateFunction(round($x_size), round($y_size));
373  }
374 
375 
376  static function ImageCopyRespectAlpha(&$dst_im, &$src_im, $dst_x, $dst_y, $src_x, $src_y, $src_w, $src_h, $opacity_pct=100) {
377  $opacipct = $opacity_pct / 100;
378  for ($x = $src_x; $x < $src_w; $x++) {
379  for ($y = $src_y; $y < $src_h; $y++) {
380  $RealPixel = phpthumb_functions::GetPixelColor($dst_im, $dst_x + $x, $dst_y + $y);
381  $OverlayPixel = phpthumb_functions::GetPixelColor($src_im, $x, $y);
382  $alphapct = $OverlayPixel['alpha'] / 127;
383  $overlaypct = (1 - $alphapct) * $opacipct;
384 
385  $newcolor = phpthumb_functions::ImageColorAllocateAlphaSafe(
386  $dst_im,
387  round($RealPixel['red'] * (1 - $overlaypct)) + ($OverlayPixel['red'] * $overlaypct),
388  round($RealPixel['green'] * (1 - $overlaypct)) + ($OverlayPixel['green'] * $overlaypct),
389  round($RealPixel['blue'] * (1 - $overlaypct)) + ($OverlayPixel['blue'] * $overlaypct),
390  //$RealPixel['alpha']);
391  0);
392 
393  ImageSetPixel($dst_im, $dst_x + $x, $dst_y + $y, $newcolor);
394  }
395  }
396  return true;
397  }
398 
399 
400  static function ProportionalResize($old_width, $old_height, $new_width=false, $new_height=false) {
401  $old_aspect_ratio = $old_width / $old_height;
402  if (($new_width === false) && ($new_height === false)) {
403  return false;
404  } elseif ($new_width === false) {
405  $new_width = $new_height * $old_aspect_ratio;
406  } elseif ($new_height === false) {
407  $new_height = $new_width / $old_aspect_ratio;
408  }
409  $new_aspect_ratio = $new_width / $new_height;
410  if ($new_aspect_ratio == $old_aspect_ratio) {
411  // great, done
412  } elseif ($new_aspect_ratio < $old_aspect_ratio) {
413  // limited by width
414  $new_height = $new_width / $old_aspect_ratio;
415  } elseif ($new_aspect_ratio > $old_aspect_ratio) {
416  // limited by height
417  $new_width = $new_height * $old_aspect_ratio;
418  }
419  return array(intval(round($new_width)), intval(round($new_height)));
420  }
421 
422 
423  static function FunctionIsDisabled($function) {
424  static $DisabledFunctions = null;
425  if (is_null($DisabledFunctions)) {
426  $disable_functions_local = explode(',', strtolower(@ini_get('disable_functions')));
427  $disable_functions_global = explode(',', strtolower(@get_cfg_var('disable_functions')));
428  foreach ($disable_functions_local as $key => $value) {
429  $DisabledFunctions[trim($value)] = 'local';
430  }
431  foreach ($disable_functions_global as $key => $value) {
432  $DisabledFunctions[trim($value)] = 'global';
433  }
434  if (@ini_get('safe_mode')) {
435  $DisabledFunctions['shell_exec'] = 'local';
436  $DisabledFunctions['set_time_limit'] = 'local';
437  }
438  }
439  return isset($DisabledFunctions[strtolower($function)]);
440  }
441 
442 
443  static function SafeExec($command) {
444  static $AllowedExecFunctions = array();
445  if (empty($AllowedExecFunctions)) {
446  $AllowedExecFunctions = array('shell_exec'=>true, 'passthru'=>true, 'system'=>true, 'exec'=>true);
447  foreach ($AllowedExecFunctions as $key => $value) {
448  $AllowedExecFunctions[$key] = !phpthumb_functions::FunctionIsDisabled($key);
449  }
450  }
451  $command .= ' 2>&1'; // force redirect stderr to stdout
452  foreach ($AllowedExecFunctions as $execfunction => $is_allowed) {
453  if (!$is_allowed) {
454  continue;
455  }
456  $returnvalue = false;
457  switch ($execfunction) {
458  case 'passthru':
459  case 'system':
460  ob_start();
461  $execfunction($command);
462  $returnvalue = ob_get_contents();
463  ob_end_clean();
464  break;
465 
466  case 'exec':
467  $output = array();
468  $lastline = $execfunction($command, $output);
469  $returnvalue = implode("\n", $output);
470  break;
471 
472  case 'shell_exec':
473  ob_start();
474  $returnvalue = $execfunction($command);
475  ob_end_clean();
476  break;
477  }
478  return $returnvalue;
479  }
480  return false;
481  }
482 
483 
484  static function ApacheLookupURIarray($filename) {
485  // apache_lookup_uri() only works when PHP is installed as an Apache module.
486  if (php_sapi_name() == 'apache') {
487  //$property_exists_exists = function_exists('property_exists');
488  $keys = array('status', 'the_request', 'status_line', 'method', 'content_type', 'handler', 'uri', 'filename', 'path_info', 'args', 'boundary', 'no_cache', 'no_local_copy', 'allowed', 'send_bodyct', 'bytes_sent', 'byterange', 'clength', 'unparsed_uri', 'mtime', 'request_time');
489  if ($apacheLookupURIobject = @apache_lookup_uri($filename)) {
490  $apacheLookupURIarray = array();
491  foreach ($keys as $key) {
492  $apacheLookupURIarray[$key] = @$apacheLookupURIobject->$key;
493  }
494  return $apacheLookupURIarray;
495  }
496  }
497  return false;
498  }
499 
500 
501  static function gd_is_bundled() {
502  static $isbundled = null;
503  if (is_null($isbundled)) {
504  $gd_info = gd_info();
505  $isbundled = (strpos($gd_info['GD Version'], 'bundled') !== false);
506  }
507  return $isbundled;
508  }
509 
510 
511  static function gd_version($fullstring=false) {
512  static $cache_gd_version = array();
513  if (empty($cache_gd_version)) {
514  $gd_info = gd_info();
515  if (preg_match('#bundled \((.+)\)$#i', $gd_info['GD Version'], $matches)) {
516  $cache_gd_version[1] = $gd_info['GD Version']; // e.g. "bundled (2.0.15 compatible)"
517  $cache_gd_version[0] = (float) $matches[1]; // e.g. "2.0" (not "bundled (2.0.15 compatible)")
518  } else {
519  $cache_gd_version[1] = $gd_info['GD Version']; // e.g. "1.6.2 or higher"
520  $cache_gd_version[0] = (float) substr($gd_info['GD Version'], 0, 3); // e.g. "1.6" (not "1.6.2 or higher")
521  }
522  }
523  return $cache_gd_version[intval($fullstring)];
524  }
525 
526 
527  static function filesize_remote($remotefile, $timeout=10) {
528  $size = false;
529  $url = phpthumb_functions::ParseURLbetter($remotefile);
530  if ($fp = @fsockopen($url['host'], ($url['port'] ? $url['port'] : 80), $errno, $errstr, $timeout)) {
531  fwrite($fp, 'HEAD '.@$url['path'].@$url['query'].' HTTP/1.0'."\r\n".'Host: '.@$url['host']."\r\n\r\n");
532  if (phpthumb_functions::version_compare_replacement(phpversion(), '4.3.0', '>=')) {
533  stream_set_timeout($fp, $timeout);
534  }
535  while (!feof($fp)) {
536  $headerline = fgets($fp, 4096);
537  if (preg_match('#^Content-Length: (.*)#i', $headerline, $matches)) {
538  $size = intval($matches[1]);
539  break;
540  }
541  }
542  fclose ($fp);
543  }
544  return $size;
545  }
546 
547 
548  static function filedate_remote($remotefile, $timeout=10) {
549  $date = false;
550  $url = phpthumb_functions::ParseURLbetter($remotefile);
551  if ($fp = @fsockopen($url['host'], ($url['port'] ? $url['port'] : 80), $errno, $errstr, $timeout)) {
552  fwrite($fp, 'HEAD '.@$url['path'].@$url['query'].' HTTP/1.0'."\r\n".'Host: '.@$url['host']."\r\n\r\n");
553  if (phpthumb_functions::version_compare_replacement(phpversion(), '4.3.0', '>=')) {
554  stream_set_timeout($fp, $timeout);
555  }
556  while (!feof($fp)) {
557  $headerline = fgets($fp, 4096);
558  if (preg_match('#^Last-Modified: (.*)#i', $headerline, $matches)) {
559  $date = strtotime($matches[1]) - date('Z');
560  break;
561  }
562  }
563  fclose ($fp);
564  }
565  return $date;
566  }
567 
568 
569  static function md5_file_safe($filename) {
570  // md5_file() doesn't exist in PHP < 4.2.0
571  if (function_exists('md5_file')) {
572  return md5_file($filename);
573  }
574  if ($fp = @fopen($filename, 'rb')) {
575  $rawData = '';
576  do {
577  $buffer = fread($fp, 8192);
578  $rawData .= $buffer;
579  } while (strlen($buffer) > 0);
580  fclose($fp);
581  return md5($rawData);
582  }
583  return false;
584  }
585 
586 
587  static function nonempty_min() {
588  $arg_list = func_get_args();
589  $acceptable = array();
590  foreach ($arg_list as $arg) {
591  if ($arg) {
592  $acceptable[] = $arg;
593  }
594  }
595  return min($acceptable);
596  }
597 
598 
599  static function LittleEndian2String($number, $minbytes=1) {
600  $intstring = '';
601  while ($number > 0) {
602  $intstring = $intstring.chr($number & 255);
603  $number >>= 8;
604  }
605  return str_pad($intstring, $minbytes, "\x00", STR_PAD_RIGHT);
606  }
607 
608  static function OneOfThese() {
609  // return the first useful (non-empty/non-zero/non-false) value from those passed
610  $arg_list = func_get_args();
611  foreach ($arg_list as $key => $value) {
612  if ($value) {
613  return $value;
614  }
615  }
616  return false;
617  }
618 
619  static function CaseInsensitiveInArray($needle, $haystack) {
620  $needle = strtolower($needle);
621  foreach ($haystack as $key => $value) {
622  if (is_array($value)) {
623  // skip?
624  } elseif ($needle == strtolower($value)) {
625  return true;
626  }
627  }
628  return false;
629  }
630 
631  static function URLreadFsock($host, $file, &$errstr, $successonly=true, $port=80, $timeout=10) {
632  if (!function_exists('fsockopen') || phpthumb_functions::FunctionIsDisabled('fsockopen')) {
633  $errstr = 'fsockopen() unavailable';
634  return false;
635  }
636  if ($fp = @fsockopen($host, $port, $errno, $errstr, $timeout)) {
637  $out = 'GET '.$file.' HTTP/1.0'."\r\n";
638  $out .= 'Host: '.$host."\r\n";
639  $out .= 'Connection: Close'."\r\n\r\n";
640  fwrite($fp, $out);
641 
642  $isHeader = true;
643  $Data_header = '';
644  $Data_body = '';
645  $header_newlocation = '';
646  while (!feof($fp)) {
647  $line = fgets($fp, 1024);
648  if ($isHeader) {
649  $Data_header .= $line;
650  } else {
651  $Data_body .= $line;
652  }
653  if (preg_match('#^HTTP/[\\.0-9]+ ([0-9]+) (.+)$#i', rtrim($line), $matches)) {
654  list($dummy, $errno, $errstr) = $matches;
655  $errno = intval($errno);
656  } elseif (preg_match('#^Location: (.*)$#i', rtrim($line), $matches)) {
657  $header_newlocation = $matches[1];
658  }
659  if ($isHeader && ($line == "\r\n")) {
660  $isHeader = false;
661  if ($successonly) {
662  switch ($errno) {
663  case 200:
664  // great, continue
665  break;
666 
667  default:
668  $errstr = $errno.' '.$errstr.($header_newlocation ? '; Location: '.$header_newlocation : '');
669  fclose($fp);
670  return false;
671  break;
672  }
673  }
674  }
675  }
676  fclose($fp);
677  return $Data_body;
678  }
679  return null;
680  }
681 
682  static function CleanUpURLencoding($url, $queryseperator='&') {
683  if (!preg_match('#^http#i', $url)) {
684  return $url;
685  }
686  $parse_url = phpthumb_functions::ParseURLbetter($url);
687  $pathelements = explode('/', $parse_url['path']);
688  $CleanPathElements = array();
689  $TranslationMatrix = array(' '=>'%20');
690  foreach ($pathelements as $key => $pathelement) {
691  $CleanPathElements[] = strtr($pathelement, $TranslationMatrix);
692  }
693  foreach ($CleanPathElements as $key => $value) {
694  if ($value === '') {
695  unset($CleanPathElements[$key]);
696  }
697  }
698 
699  $queries = explode($queryseperator, (isset($parse_url['query']) ? $parse_url['query'] : ''));
700  $CleanQueries = array();
701  foreach ($queries as $key => $query) {
702  @list($param, $value) = explode('=', $query);
703  $CleanQueries[] = strtr($param, $TranslationMatrix).($value ? '='.strtr($value, $TranslationMatrix) : '');
704  }
705  foreach ($CleanQueries as $key => $value) {
706  if ($value === '') {
707  unset($CleanQueries[$key]);
708  }
709  }
710 
711  $cleaned_url = $parse_url['scheme'].'://';
712  $cleaned_url .= (@$parse_url['username'] ? $parse_url['host'].(@$parse_url['password'] ? ':'.$parse_url['password'] : '').'@' : '');
713  $cleaned_url .= $parse_url['host'];
714  $cleaned_url .= ((!empty($parse_url['port']) && ($parse_url['port'] != 80)) ? ':'.$parse_url['port'] : '');
715  $cleaned_url .= '/'.implode('/', $CleanPathElements);
716  $cleaned_url .= (@$CleanQueries ? '?'.implode($queryseperator, $CleanQueries) : '');
717  return $cleaned_url;
718  }
719 
720  static function ParseURLbetter($url) {
721  $parsedURL = @parse_url($url);
722  if (!@$parsedURL['port']) {
723  switch (strtolower(@$parsedURL['scheme'])) {
724  case 'ftp':
725  $parsedURL['port'] = 21;
726  break;
727  case 'https':
728  $parsedURL['port'] = 443;
729  break;
730  case 'http':
731  $parsedURL['port'] = 80;
732  break;
733  }
734  }
735  return $parsedURL;
736  }
737 
738  static function SafeURLread($url, &$error, $timeout=10, $followredirects=true) {
739  $error = '';
740 
741  $parsed_url = phpthumb_functions::ParseURLbetter($url);
742  $alreadyLookedAtURLs[trim($url)] = true;
743 
744  while (true) {
745  $tryagain = false;
746  $rawData = phpthumb_functions::URLreadFsock(@$parsed_url['host'], @$parsed_url['path'].'?'.@$parsed_url['query'], $errstr, true, (@$parsed_url['port'] ? @$parsed_url['port'] : 80), $timeout);
747  if (preg_match('#302 [a-z ]+; Location\\: (http.*)#i', $errstr, $matches)) {
748  $matches[1] = trim(@$matches[1]);
749  if (!@$alreadyLookedAtURLs[$matches[1]]) {
750  // loop through and examine new URL
751  $error .= 'URL "'.$url.'" redirected to "'.$matches[1].'"';
752 
753  $tryagain = true;
754  $alreadyLookedAtURLs[$matches[1]] = true;
755  $parsed_url = phpthumb_functions::ParseURLbetter($matches[1]);
756  }
757  }
758  if (!$tryagain) {
759  break;
760  }
761  }
762 
763  if ($rawData === false) {
764  $error .= 'Error opening "'.$url.'":'."\n\n".$errstr;
765  return false;
766  } elseif ($rawData === null) {
767  // fall through
768  $error .= 'Error opening "'.$url.'":'."\n\n".$errstr;
769  } else {
770  return $rawData;
771  }
772 
773  if (function_exists('curl_version') && !phpthumb_functions::FunctionIsDisabled('curl_exec')) {
774  $ch = curl_init();
775  curl_setopt($ch, CURLOPT_URL, $url);
776  curl_setopt($ch, CURLOPT_HEADER, false);
777  curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
778  curl_setopt($ch, CURLOPT_BINARYTRANSFER, true);
779  curl_setopt($ch, CURLOPT_TIMEOUT, $timeout);
780  $rawData = curl_exec($ch);
781  curl_close($ch);
782  if (strlen($rawData) > 0) {
783  $error .= 'CURL succeeded ('.strlen($rawData).' bytes); ';
784  return $rawData;
785  }
786  $error .= 'CURL available but returned no data; ';
787  } else {
788  $error .= 'CURL unavailable; ';
789  }
790 
791  $BrokenURLfopenPHPversions = array('4.4.2');
792  if (in_array(phpversion(), $BrokenURLfopenPHPversions)) {
793  $error .= 'fopen(URL) broken in PHP v'.phpversion().'; ';
794  } elseif (@ini_get('allow_url_fopen')) {
795  $rawData = '';
796  $error_fopen = '';
797  ob_start();
798  if ($fp = fopen($url, 'rb')) {
799  do {
800  $buffer = fread($fp, 8192);
801  $rawData .= $buffer;
802  } while (strlen($buffer) > 0);
803  fclose($fp);
804  } else {
805  $error_fopen .= trim(strip_tags(ob_get_contents()));
806  }
807  ob_end_clean();
808  $error .= $error_fopen;
809  if (!$error_fopen) {
810  $error .= '; "allow_url_fopen" succeeded ('.strlen($rawData).' bytes); ';
811  return $rawData;
812  }
813  $error .= '; "allow_url_fopen" enabled but returned no data ('.$error_fopen.'); ';
814  } else {
815  $error .= '"allow_url_fopen" disabled; ';
816  }
817 
818  return false;
819  }
820 
821  static function EnsureDirectoryExists($dirname) {
822  $directory_elements = explode(DIRECTORY_SEPARATOR, $dirname);
823  $startoffset = (!$directory_elements[0] ? 2 : 1); // unix with leading "/" then start with 2nd element; Windows with leading "c:\" then start with 1st element
824  $open_basedirs = preg_split('#[;:]#', ini_get('open_basedir'));
825  foreach ($open_basedirs as $key => $open_basedir) {
826  if (preg_match('#^'.preg_quote($open_basedir).'#', $dirname) && (strlen($dirname) > strlen($open_basedir))) {
827  $startoffset = count(explode(DIRECTORY_SEPARATOR, $open_basedir));
828  break;
829  }
830  }
831  $i = $startoffset;
832  $endoffset = count($directory_elements);
833  for ($i = $startoffset; $i <= $endoffset; $i++) {
834  $test_directory = implode(DIRECTORY_SEPARATOR, array_slice($directory_elements, 0, $i));
835  if (!$test_directory) {
836  continue;
837  }
838  if (!@is_dir($test_directory)) {
839  if (@file_exists($test_directory)) {
840  // directory name already exists as a file
841  return false;
842  }
843  @mkdir($test_directory, 0755);
844  @chmod($test_directory, 0755);
845  if (!@is_dir($test_directory) || !@is_writeable($test_directory)) {
846  return false;
847  }
848  }
849  }
850  return true;
851  }
852 
853 
854  static function GetAllFilesInSubfolders($dirname) {
855  $AllFiles = array();
856  $dirname = rtrim(realpath($dirname), '/\\');
857  if ($dirhandle = @opendir($dirname)) {
858  while (($file = readdir($dirhandle)) !== false) {
859  $fullfilename = $dirname.DIRECTORY_SEPARATOR.$file;
860  if (is_file($fullfilename)) {
861  $AllFiles[] = $fullfilename;
862  } elseif (is_dir($fullfilename)) {
863  switch ($file) {
864  case '.':
865  case '..':
866  break;
867 
868  default:
869  $AllFiles[] = $fullfilename;
870  $subfiles = phpthumb_functions::GetAllFilesInSubfolders($fullfilename);
871  foreach ($subfiles as $filename) {
872  $AllFiles[] = $filename;
873  }
874  break;
875  }
876  } else {
877  // ignore?
878  }
879  }
880  closedir($dirhandle);
881  }
882  sort($AllFiles);
883  return array_unique($AllFiles);
884  }
885 
886 
887  static function SanitizeFilename($filename) {
888  $filename = preg_replace('/[^'.preg_quote(' !#$%^()+,-.;<>=@[]_{}').'a-zA-Z0-9]/', '_', $filename);
889  if (phpthumb_functions::version_compare_replacement(phpversion(), '4.1.0', '>=')) {
890  $filename = trim($filename, '.');
891  }
892  return $filename;
893  }
894 
895 }
896 
897 
899 
900 
901 if (!function_exists('gd_info')) {
902  // built into PHP v4.3.0+ (with bundled GD2 library)
903  function gd_info() {
904  static $gd_info = array();
905  if (empty($gd_info)) {
906  // based on code by johnschaefer at gmx dot de
907  // from PHP help on gd_info()
908  $gd_info = array(
909  'GD Version' => '',
910  'FreeType Support' => false,
911  'FreeType Linkage' => '',
912  'T1Lib Support' => false,
913  'GIF Read Support' => false,
914  'GIF Create Support' => false,
915  'JPG Support' => false,
916  'PNG Support' => false,
917  'WBMP Support' => false,
918  'XBM Support' => false
919  );
920  $phpinfo_array = phpthumb_functions::phpinfo_array();
921  foreach ($phpinfo_array as $line) {
922  $line = trim(strip_tags($line));
923  foreach ($gd_info as $key => $value) {
924  //if (strpos($line, $key) !== false) {
925  if (strpos($line, $key) === 0) {
926  $newvalue = trim(str_replace($key, '', $line));
927  $gd_info[$key] = $newvalue;
928  }
929  }
930  }
931  if (empty($gd_info['GD Version'])) {
932  // probable cause: "phpinfo() disabled for security reasons"
933  if (function_exists('ImageTypes')) {
934  $imagetypes = ImageTypes();
935  if ($imagetypes & IMG_PNG) {
936  $gd_info['PNG Support'] = true;
937  }
938  if ($imagetypes & IMG_GIF) {
939  $gd_info['GIF Create Support'] = true;
940  }
941  if ($imagetypes & IMG_JPG) {
942  $gd_info['JPG Support'] = true;
943  }
944  if ($imagetypes & IMG_WBMP) {
945  $gd_info['WBMP Support'] = true;
946  }
947  }
948  // to determine capability of GIF creation, try to use ImageCreateFromGIF on a 1px GIF
949  if (function_exists('ImageCreateFromGIF')) {
950  if ($tempfilename = phpthumb::phpThumb_tempnam()) {
951  if ($fp_tempfile = @fopen($tempfilename, 'wb')) {
952  fwrite($fp_tempfile, base64_decode('R0lGODlhAQABAIAAAH//AP///ywAAAAAAQABAAACAUQAOw==')); // very simple 1px GIF file base64-encoded as string
953  fclose($fp_tempfile);
954 
955  // if we can convert the GIF file to a GD image then GIF create support must be enabled, otherwise it's not
956  $gd_info['GIF Read Support'] = (bool) @ImageCreateFromGIF($tempfilename);
957  }
958  unlink($tempfilename);
959  }
960  }
961  if (function_exists('ImageCreateTrueColor') && @ImageCreateTrueColor(1, 1)) {
962  $gd_info['GD Version'] = '2.0.1 or higher (assumed)';
963  } elseif (function_exists('ImageCreate') && @ImageCreate(1, 1)) {
964  $gd_info['GD Version'] = '1.6.0 or higher (assumed)';
965  }
966  }
967  }
968  return $gd_info;
969  }
970 }
971 
972 
973 if (!function_exists('is_executable')) {
974  // in PHP v3+, but v5.0+ for Windows
975  function is_executable($filename) {
976  // poor substitute, but better than nothing
977  return file_exists($filename);
978  }
979 }
980 
981 
982 if (!function_exists('preg_quote')) {
983  // included in PHP v3.0.9+, but may be unavailable if not compiled in
984  function preg_quote($string, $delimiter='\\') {
985  static $preg_quote_array = array();
986  if (empty($preg_quote_array)) {
987  $escapeables = '.\\+*?[^]$(){}=!<>|:';
988  for ($i = 0; $i < strlen($escapeables); $i++) {
989  $strtr_preg_quote[$escapeables{$i}] = $delimiter.$escapeables{$i};
990  }
991  }
992  return strtr($string, $strtr_preg_quote);
993  }
994 }
995 
996 if (!function_exists('file_get_contents')) {
997  // included in PHP v4.3.0+
998  function file_get_contents($filename) {
999  if (preg_match('#^(f|ht)tp\://#i', $filename)) {
1000  return SafeURLread($filename, $error);
1001  }
1002  if ($fp = @fopen($filename, 'rb')) {
1003  $rawData = '';
1004  do {
1005  $buffer = fread($fp, 8192);
1006  $rawData .= $buffer;
1007  } while (strlen($buffer) > 0);
1008  fclose($fp);
1009  return $rawData;
1010  }
1011  return false;
1012  }
1013 }
1014 
1015 
1016 if (!function_exists('file_put_contents')) {
1017  // included in PHP v5.0.0+
1018  function file_put_contents($filename, $filedata) {
1019  if ($fp = @fopen($filename, 'wb')) {
1020  fwrite($fp, $filedata);
1021  fclose($fp);
1022  return true;
1023  }
1024  return false;
1025  }
1026 }
1027 
1028 if (!function_exists('imagealphablending')) {
1029  // built-in function requires PHP v4.0.6+ *and* GD v2.0.1+
1030  function imagealphablending(&$img, $blendmode=true) {
1031  // do nothing, this function is declared here just to
1032  // prevent runtime errors if GD2 is not available
1033  return true;
1034  }
1035 }
1036 
1037 if (!function_exists('imagesavealpha')) {
1038  // built-in function requires PHP v4.3.2+ *and* GD v2.0.1+
1039  function imagesavealpha(&$img, $blendmode=true) {
1040  // do nothing, this function is declared here just to
1041  // prevent runtime errors if GD2 is not available
1042  return true;
1043  }
1044 }
1045 
1046 ?>