WordPress 3.9.2
[autoinstalls/wordpress.git] / wp-includes / ID3 / getid3.lib.php
1 <?php
2 /////////////////////////////////////////////////////////////////
3 /// getID3() by James Heinrich <info@getid3.org>               //
4 //  available at http://getid3.sourceforge.net                 //
5 //            or http://www.getid3.org                         //
6 /////////////////////////////////////////////////////////////////
7 //                                                             //
8 // getid3.lib.php - part of getID3()                           //
9 // See readme.txt for more details                             //
10 //                                                            ///
11 /////////////////////////////////////////////////////////////////
12
13
14 class getid3_lib
15 {
16
17         public static function PrintHexBytes($string, $hex=true, $spaces=true, $htmlencoding='UTF-8') {
18                 $returnstring = '';
19                 for ($i = 0; $i < strlen($string); $i++) {
20                         if ($hex) {
21                                 $returnstring .= str_pad(dechex(ord($string{$i})), 2, '0', STR_PAD_LEFT);
22                         } else {
23                                 $returnstring .= ' '.(preg_match("#[\x20-\x7E]#", $string{$i}) ? $string{$i} : '¤');
24                         }
25                         if ($spaces) {
26                                 $returnstring .= ' ';
27                         }
28                 }
29                 if (!empty($htmlencoding)) {
30                         if ($htmlencoding === true) {
31                                 $htmlencoding = 'UTF-8'; // prior to getID3 v1.9.0 the function's 4th parameter was boolean
32                         }
33                         $returnstring = htmlentities($returnstring, ENT_QUOTES, $htmlencoding);
34                 }
35                 return $returnstring;
36         }
37
38         public static function trunc($floatnumber) {
39                 // truncates a floating-point number at the decimal point
40                 // returns int (if possible, otherwise float)
41                 if ($floatnumber >= 1) {
42                         $truncatednumber = floor($floatnumber);
43                 } elseif ($floatnumber <= -1) {
44                         $truncatednumber = ceil($floatnumber);
45                 } else {
46                         $truncatednumber = 0;
47                 }
48                 if (self::intValueSupported($truncatednumber)) {
49                         $truncatednumber = (int) $truncatednumber;
50                 }
51                 return $truncatednumber;
52         }
53
54
55         public static function safe_inc(&$variable, $increment=1) {
56                 if (isset($variable)) {
57                         $variable += $increment;
58                 } else {
59                         $variable = $increment;
60                 }
61                 return true;
62         }
63
64         public static function CastAsInt($floatnum) {
65                 // convert to float if not already
66                 $floatnum = (float) $floatnum;
67
68                 // convert a float to type int, only if possible
69                 if (self::trunc($floatnum) == $floatnum) {
70                         // it's not floating point
71                         if (self::intValueSupported($floatnum)) {
72                                 // it's within int range
73                                 $floatnum = (int) $floatnum;
74                         }
75                 }
76                 return $floatnum;
77         }
78
79         public static function intValueSupported($num) {
80                 // check if integers are 64-bit
81                 static $hasINT64 = null;
82                 if ($hasINT64 === null) { // 10x faster than is_null()
83                         $hasINT64 = is_int(pow(2, 31)); // 32-bit int are limited to (2^31)-1
84                         if (!$hasINT64 && !defined('PHP_INT_MIN')) {
85                                 define('PHP_INT_MIN', ~PHP_INT_MAX);
86                         }
87                 }
88                 // if integers are 64-bit - no other check required
89                 if ($hasINT64 || (($num <= PHP_INT_MAX) && ($num >= PHP_INT_MIN))) {
90                         return true;
91                 }
92                 return false;
93         }
94
95         public static function DecimalizeFraction($fraction) {
96                 list($numerator, $denominator) = explode('/', $fraction);
97                 return $numerator / ($denominator ? $denominator : 1);
98         }
99
100
101         public static function DecimalBinary2Float($binarynumerator) {
102                 $numerator   = self::Bin2Dec($binarynumerator);
103                 $denominator = self::Bin2Dec('1'.str_repeat('0', strlen($binarynumerator)));
104                 return ($numerator / $denominator);
105         }
106
107
108         public static function NormalizeBinaryPoint($binarypointnumber, $maxbits=52) {
109                 // http://www.scri.fsu.edu/~jac/MAD3401/Backgrnd/binary.html
110                 if (strpos($binarypointnumber, '.') === false) {
111                         $binarypointnumber = '0.'.$binarypointnumber;
112                 } elseif ($binarypointnumber{0} == '.') {
113                         $binarypointnumber = '0'.$binarypointnumber;
114                 }
115                 $exponent = 0;
116                 while (($binarypointnumber{0} != '1') || (substr($binarypointnumber, 1, 1) != '.')) {
117                         if (substr($binarypointnumber, 1, 1) == '.') {
118                                 $exponent--;
119                                 $binarypointnumber = substr($binarypointnumber, 2, 1).'.'.substr($binarypointnumber, 3);
120                         } else {
121                                 $pointpos = strpos($binarypointnumber, '.');
122                                 $exponent += ($pointpos - 1);
123                                 $binarypointnumber = str_replace('.', '', $binarypointnumber);
124                                 $binarypointnumber = $binarypointnumber{0}.'.'.substr($binarypointnumber, 1);
125                         }
126                 }
127                 $binarypointnumber = str_pad(substr($binarypointnumber, 0, $maxbits + 2), $maxbits + 2, '0', STR_PAD_RIGHT);
128                 return array('normalized'=>$binarypointnumber, 'exponent'=>(int) $exponent);
129         }
130
131
132         public static function Float2BinaryDecimal($floatvalue) {
133                 // http://www.scri.fsu.edu/~jac/MAD3401/Backgrnd/binary.html
134                 $maxbits = 128; // to how many bits of precision should the calculations be taken?
135                 $intpart   = self::trunc($floatvalue);
136                 $floatpart = abs($floatvalue - $intpart);
137                 $pointbitstring = '';
138                 while (($floatpart != 0) && (strlen($pointbitstring) < $maxbits)) {
139                         $floatpart *= 2;
140                         $pointbitstring .= (string) self::trunc($floatpart);
141                         $floatpart -= self::trunc($floatpart);
142                 }
143                 $binarypointnumber = decbin($intpart).'.'.$pointbitstring;
144                 return $binarypointnumber;
145         }
146
147
148         public static function Float2String($floatvalue, $bits) {
149                 // http://www.scri.fsu.edu/~jac/MAD3401/Backgrnd/ieee-expl.html
150                 switch ($bits) {
151                         case 32:
152                                 $exponentbits = 8;
153                                 $fractionbits = 23;
154                                 break;
155
156                         case 64:
157                                 $exponentbits = 11;
158                                 $fractionbits = 52;
159                                 break;
160
161                         default:
162                                 return false;
163                                 break;
164                 }
165                 if ($floatvalue >= 0) {
166                         $signbit = '0';
167                 } else {
168                         $signbit = '1';
169                 }
170                 $normalizedbinary  = self::NormalizeBinaryPoint(self::Float2BinaryDecimal($floatvalue), $fractionbits);
171                 $biasedexponent    = pow(2, $exponentbits - 1) - 1 + $normalizedbinary['exponent']; // (127 or 1023) +/- exponent
172                 $exponentbitstring = str_pad(decbin($biasedexponent), $exponentbits, '0', STR_PAD_LEFT);
173                 $fractionbitstring = str_pad(substr($normalizedbinary['normalized'], 2), $fractionbits, '0', STR_PAD_RIGHT);
174
175                 return self::BigEndian2String(self::Bin2Dec($signbit.$exponentbitstring.$fractionbitstring), $bits % 8, false);
176         }
177
178
179         public static function LittleEndian2Float($byteword) {
180                 return self::BigEndian2Float(strrev($byteword));
181         }
182
183
184         public static function BigEndian2Float($byteword) {
185                 // ANSI/IEEE Standard 754-1985, Standard for Binary Floating Point Arithmetic
186                 // http://www.psc.edu/general/software/packages/ieee/ieee.html
187                 // http://www.scri.fsu.edu/~jac/MAD3401/Backgrnd/ieee.html
188
189                 $bitword = self::BigEndian2Bin($byteword);
190                 if (!$bitword) {
191                         return 0;
192                 }
193                 $signbit = $bitword{0};
194
195                 switch (strlen($byteword) * 8) {
196                         case 32:
197                                 $exponentbits = 8;
198                                 $fractionbits = 23;
199                                 break;
200
201                         case 64:
202                                 $exponentbits = 11;
203                                 $fractionbits = 52;
204                                 break;
205
206                         case 80:
207                                 // 80-bit Apple SANE format
208                                 // http://www.mactech.com/articles/mactech/Vol.06/06.01/SANENormalized/
209                                 $exponentstring = substr($bitword, 1, 15);
210                                 $isnormalized = intval($bitword{16});
211                                 $fractionstring = substr($bitword, 17, 63);
212                                 $exponent = pow(2, self::Bin2Dec($exponentstring) - 16383);
213                                 $fraction = $isnormalized + self::DecimalBinary2Float($fractionstring);
214                                 $floatvalue = $exponent * $fraction;
215                                 if ($signbit == '1') {
216                                         $floatvalue *= -1;
217                                 }
218                                 return $floatvalue;
219                                 break;
220
221                         default:
222                                 return false;
223                                 break;
224                 }
225                 $exponentstring = substr($bitword, 1, $exponentbits);
226                 $fractionstring = substr($bitword, $exponentbits + 1, $fractionbits);
227                 $exponent = self::Bin2Dec($exponentstring);
228                 $fraction = self::Bin2Dec($fractionstring);
229
230                 if (($exponent == (pow(2, $exponentbits) - 1)) && ($fraction != 0)) {
231                         // Not a Number
232                         $floatvalue = false;
233                 } elseif (($exponent == (pow(2, $exponentbits) - 1)) && ($fraction == 0)) {
234                         if ($signbit == '1') {
235                                 $floatvalue = '-infinity';
236                         } else {
237                                 $floatvalue = '+infinity';
238                         }
239                 } elseif (($exponent == 0) && ($fraction == 0)) {
240                         if ($signbit == '1') {
241                                 $floatvalue = -0;
242                         } else {
243                                 $floatvalue = 0;
244                         }
245                         $floatvalue = ($signbit ? 0 : -0);
246                 } elseif (($exponent == 0) && ($fraction != 0)) {
247                         // These are 'unnormalized' values
248                         $floatvalue = pow(2, (-1 * (pow(2, $exponentbits - 1) - 2))) * self::DecimalBinary2Float($fractionstring);
249                         if ($signbit == '1') {
250                                 $floatvalue *= -1;
251                         }
252                 } elseif ($exponent != 0) {
253                         $floatvalue = pow(2, ($exponent - (pow(2, $exponentbits - 1) - 1))) * (1 + self::DecimalBinary2Float($fractionstring));
254                         if ($signbit == '1') {
255                                 $floatvalue *= -1;
256                         }
257                 }
258                 return (float) $floatvalue;
259         }
260
261
262         public static function BigEndian2Int($byteword, $synchsafe=false, $signed=false) {
263                 $intvalue = 0;
264                 $bytewordlen = strlen($byteword);
265                 if ($bytewordlen == 0) {
266                         return false;
267                 }
268                 for ($i = 0; $i < $bytewordlen; $i++) {
269                         if ($synchsafe) { // disregard MSB, effectively 7-bit bytes
270                                 //$intvalue = $intvalue | (ord($byteword{$i}) & 0x7F) << (($bytewordlen - 1 - $i) * 7); // faster, but runs into problems past 2^31 on 32-bit systems
271                                 $intvalue += (ord($byteword{$i}) & 0x7F) * pow(2, ($bytewordlen - 1 - $i) * 7);
272                         } else {
273                                 $intvalue += ord($byteword{$i}) * pow(256, ($bytewordlen - 1 - $i));
274                         }
275                 }
276                 if ($signed && !$synchsafe) {
277                         // synchsafe ints are not allowed to be signed
278                         if ($bytewordlen <= PHP_INT_SIZE) {
279                                 $signMaskBit = 0x80 << (8 * ($bytewordlen - 1));
280                                 if ($intvalue & $signMaskBit) {
281                                         $intvalue = 0 - ($intvalue & ($signMaskBit - 1));
282                                 }
283                         } else {
284                                 throw new Exception('ERROR: Cannot have signed integers larger than '.(8 * PHP_INT_SIZE).'-bits ('.strlen($byteword).') in self::BigEndian2Int()');
285                                 break;
286                         }
287                 }
288                 return self::CastAsInt($intvalue);
289         }
290
291
292         public static function LittleEndian2Int($byteword, $signed=false) {
293                 return self::BigEndian2Int(strrev($byteword), false, $signed);
294         }
295
296
297         public static function BigEndian2Bin($byteword) {
298                 $binvalue = '';
299                 $bytewordlen = strlen($byteword);
300                 for ($i = 0; $i < $bytewordlen; $i++) {
301                         $binvalue .= str_pad(decbin(ord($byteword{$i})), 8, '0', STR_PAD_LEFT);
302                 }
303                 return $binvalue;
304         }
305
306
307         public static function BigEndian2String($number, $minbytes=1, $synchsafe=false, $signed=false) {
308                 if ($number < 0) {
309                         throw new Exception('ERROR: self::BigEndian2String() does not support negative numbers');
310                 }
311                 $maskbyte = (($synchsafe || $signed) ? 0x7F : 0xFF);
312                 $intstring = '';
313                 if ($signed) {
314                         if ($minbytes > PHP_INT_SIZE) {
315                                 throw new Exception('ERROR: Cannot have signed integers larger than '.(8 * PHP_INT_SIZE).'-bits in self::BigEndian2String()');
316                         }
317                         $number = $number & (0x80 << (8 * ($minbytes - 1)));
318                 }
319                 while ($number != 0) {
320                         $quotient = ($number / ($maskbyte + 1));
321                         $intstring = chr(ceil(($quotient - floor($quotient)) * $maskbyte)).$intstring;
322                         $number = floor($quotient);
323                 }
324                 return str_pad($intstring, $minbytes, "\x00", STR_PAD_LEFT);
325         }
326
327
328         public static function Dec2Bin($number) {
329                 while ($number >= 256) {
330                         $bytes[] = (($number / 256) - (floor($number / 256))) * 256;
331                         $number = floor($number / 256);
332                 }
333                 $bytes[] = $number;
334                 $binstring = '';
335                 for ($i = 0; $i < count($bytes); $i++) {
336                         $binstring = (($i == count($bytes) - 1) ? decbin($bytes[$i]) : str_pad(decbin($bytes[$i]), 8, '0', STR_PAD_LEFT)).$binstring;
337                 }
338                 return $binstring;
339         }
340
341
342         public static function Bin2Dec($binstring, $signed=false) {
343                 $signmult = 1;
344                 if ($signed) {
345                         if ($binstring{0} == '1') {
346                                 $signmult = -1;
347                         }
348                         $binstring = substr($binstring, 1);
349                 }
350                 $decvalue = 0;
351                 for ($i = 0; $i < strlen($binstring); $i++) {
352                         $decvalue += ((int) substr($binstring, strlen($binstring) - $i - 1, 1)) * pow(2, $i);
353                 }
354                 return self::CastAsInt($decvalue * $signmult);
355         }
356
357
358         public static function Bin2String($binstring) {
359                 // return 'hi' for input of '0110100001101001'
360                 $string = '';
361                 $binstringreversed = strrev($binstring);
362                 for ($i = 0; $i < strlen($binstringreversed); $i += 8) {
363                         $string = chr(self::Bin2Dec(strrev(substr($binstringreversed, $i, 8)))).$string;
364                 }
365                 return $string;
366         }
367
368
369         public static function LittleEndian2String($number, $minbytes=1, $synchsafe=false) {
370                 $intstring = '';
371                 while ($number > 0) {
372                         if ($synchsafe) {
373                                 $intstring = $intstring.chr($number & 127);
374                                 $number >>= 7;
375                         } else {
376                                 $intstring = $intstring.chr($number & 255);
377                                 $number >>= 8;
378                         }
379                 }
380                 return str_pad($intstring, $minbytes, "\x00", STR_PAD_RIGHT);
381         }
382
383
384         public static function array_merge_clobber($array1, $array2) {
385                 // written by kcØhireability*com
386                 // taken from http://www.php.net/manual/en/function.array-merge-recursive.php
387                 if (!is_array($array1) || !is_array($array2)) {
388                         return false;
389                 }
390                 $newarray = $array1;
391                 foreach ($array2 as $key => $val) {
392                         if (is_array($val) && isset($newarray[$key]) && is_array($newarray[$key])) {
393                                 $newarray[$key] = self::array_merge_clobber($newarray[$key], $val);
394                         } else {
395                                 $newarray[$key] = $val;
396                         }
397                 }
398                 return $newarray;
399         }
400
401
402         public static function array_merge_noclobber($array1, $array2) {
403                 if (!is_array($array1) || !is_array($array2)) {
404                         return false;
405                 }
406                 $newarray = $array1;
407                 foreach ($array2 as $key => $val) {
408                         if (is_array($val) && isset($newarray[$key]) && is_array($newarray[$key])) {
409                                 $newarray[$key] = self::array_merge_noclobber($newarray[$key], $val);
410                         } elseif (!isset($newarray[$key])) {
411                                 $newarray[$key] = $val;
412                         }
413                 }
414                 return $newarray;
415         }
416
417
418         public static function ksort_recursive(&$theArray) {
419                 ksort($theArray);
420                 foreach ($theArray as $key => $value) {
421                         if (is_array($value)) {
422                                 self::ksort_recursive($theArray[$key]);
423                         }
424                 }
425                 return true;
426         }
427
428         public static function fileextension($filename, $numextensions=1) {
429                 if (strstr($filename, '.')) {
430                         $reversedfilename = strrev($filename);
431                         $offset = 0;
432                         for ($i = 0; $i < $numextensions; $i++) {
433                                 $offset = strpos($reversedfilename, '.', $offset + 1);
434                                 if ($offset === false) {
435                                         return '';
436                                 }
437                         }
438                         return strrev(substr($reversedfilename, 0, $offset));
439                 }
440                 return '';
441         }
442
443
444         public static function PlaytimeString($seconds) {
445                 $sign = (($seconds < 0) ? '-' : '');
446                 $seconds = round(abs($seconds));
447                 $H = (int) floor( $seconds                            / 3600);
448                 $M = (int) floor(($seconds - (3600 * $H)            ) /   60);
449                 $S = (int) round( $seconds - (3600 * $H) - (60 * $M)        );
450                 return $sign.($H ? $H.':' : '').($H ? str_pad($M, 2, '0', STR_PAD_LEFT) : intval($M)).':'.str_pad($S, 2, 0, STR_PAD_LEFT);
451         }
452
453
454         public static function DateMac2Unix($macdate) {
455                 // Macintosh timestamp: seconds since 00:00h January 1, 1904
456                 // UNIX timestamp:      seconds since 00:00h January 1, 1970
457                 return self::CastAsInt($macdate - 2082844800);
458         }
459
460
461         public static function FixedPoint8_8($rawdata) {
462                 return self::BigEndian2Int(substr($rawdata, 0, 1)) + (float) (self::BigEndian2Int(substr($rawdata, 1, 1)) / pow(2, 8));
463         }
464
465
466         public static function FixedPoint16_16($rawdata) {
467                 return self::BigEndian2Int(substr($rawdata, 0, 2)) + (float) (self::BigEndian2Int(substr($rawdata, 2, 2)) / pow(2, 16));
468         }
469
470
471         public static function FixedPoint2_30($rawdata) {
472                 $binarystring = self::BigEndian2Bin($rawdata);
473                 return self::Bin2Dec(substr($binarystring, 0, 2)) + (float) (self::Bin2Dec(substr($binarystring, 2, 30)) / pow(2, 30));
474         }
475
476
477         public static function CreateDeepArray($ArrayPath, $Separator, $Value) {
478                 // assigns $Value to a nested array path:
479                 //   $foo = self::CreateDeepArray('/path/to/my', '/', 'file.txt')
480                 // is the same as:
481                 //   $foo = array('path'=>array('to'=>'array('my'=>array('file.txt'))));
482                 // or
483                 //   $foo['path']['to']['my'] = 'file.txt';
484                 $ArrayPath = ltrim($ArrayPath, $Separator);
485                 if (($pos = strpos($ArrayPath, $Separator)) !== false) {
486                         $ReturnedArray[substr($ArrayPath, 0, $pos)] = self::CreateDeepArray(substr($ArrayPath, $pos + 1), $Separator, $Value);
487                 } else {
488                         $ReturnedArray[$ArrayPath] = $Value;
489                 }
490                 return $ReturnedArray;
491         }
492
493         public static function array_max($arraydata, $returnkey=false) {
494                 $maxvalue = false;
495                 $maxkey = false;
496                 foreach ($arraydata as $key => $value) {
497                         if (!is_array($value)) {
498                                 if ($value > $maxvalue) {
499                                         $maxvalue = $value;
500                                         $maxkey = $key;
501                                 }
502                         }
503                 }
504                 return ($returnkey ? $maxkey : $maxvalue);
505         }
506
507         public static function array_min($arraydata, $returnkey=false) {
508                 $minvalue = false;
509                 $minkey = false;
510                 foreach ($arraydata as $key => $value) {
511                         if (!is_array($value)) {
512                                 if ($value > $minvalue) {
513                                         $minvalue = $value;
514                                         $minkey = $key;
515                                 }
516                         }
517                 }
518                 return ($returnkey ? $minkey : $minvalue);
519         }
520
521         public static function XML2array($XMLstring) {
522                 if ( function_exists( 'simplexml_load_string' ) && function_exists( 'libxml_disable_entity_loader' ) ) {
523                         $loader = libxml_disable_entity_loader( true );
524                         $XMLobject = simplexml_load_string( $XMLstring, 'SimpleXMLElement', LIBXML_NOENT );
525                         $return = self::SimpleXMLelement2array( $XMLobject );
526                         libxml_disable_entity_loader( $loader );
527                         return $return;
528                 }
529                 return false;
530         }
531
532         public static function SimpleXMLelement2array($XMLobject) {
533                 if (!is_object($XMLobject) && !is_array($XMLobject)) {
534                         return $XMLobject;
535                 }
536                 $XMLarray = (is_object($XMLobject) ? get_object_vars($XMLobject) : $XMLobject);
537                 foreach ($XMLarray as $key => $value) {
538                         $XMLarray[$key] = self::SimpleXMLelement2array($value);
539                 }
540                 return $XMLarray;
541         }
542
543
544         // Allan Hansen <ahØartemis*dk>
545         // self::md5_data() - returns md5sum for a file from startuing position to absolute end position
546         public static function hash_data($file, $offset, $end, $algorithm) {
547                 static $tempdir = '';
548                 if (!self::intValueSupported($end)) {
549                         return false;
550                 }
551                 switch ($algorithm) {
552                         case 'md5':
553                                 $hash_function = 'md5_file';
554                                 $unix_call     = 'md5sum';
555                                 $windows_call  = 'md5sum.exe';
556                                 $hash_length   = 32;
557                                 break;
558
559                         case 'sha1':
560                                 $hash_function = 'sha1_file';
561                                 $unix_call     = 'sha1sum';
562                                 $windows_call  = 'sha1sum.exe';
563                                 $hash_length   = 40;
564                                 break;
565
566                         default:
567                                 throw new Exception('Invalid algorithm ('.$algorithm.') in self::hash_data()');
568                                 break;
569                 }
570                 $size = $end - $offset;
571                 while (true) {
572                         if (GETID3_OS_ISWINDOWS) {
573
574                                 // It seems that sha1sum.exe for Windows only works on physical files, does not accept piped data
575                                 // Fall back to create-temp-file method:
576                                 if ($algorithm == 'sha1') {
577                                         break;
578                                 }
579
580                                 $RequiredFiles = array('cygwin1.dll', 'head.exe', 'tail.exe', $windows_call);
581                                 foreach ($RequiredFiles as $required_file) {
582                                         if (!is_readable(GETID3_HELPERAPPSDIR.$required_file)) {
583                                                 // helper apps not available - fall back to old method
584                                                 break 2;
585                                         }
586                                 }
587                                 $commandline  = GETID3_HELPERAPPSDIR.'head.exe -c '.$end.' '.escapeshellarg(str_replace('/', DIRECTORY_SEPARATOR, $file)).' | ';
588                                 $commandline .= GETID3_HELPERAPPSDIR.'tail.exe -c '.$size.' | ';
589                                 $commandline .= GETID3_HELPERAPPSDIR.$windows_call;
590
591                         } else {
592
593                                 $commandline  = 'head -c'.$end.' '.escapeshellarg($file).' | ';
594                                 $commandline .= 'tail -c'.$size.' | ';
595                                 $commandline .= $unix_call;
596
597                         }
598                         if (preg_match('#(1|ON)#i', ini_get('safe_mode'))) {
599                                 //throw new Exception('PHP running in Safe Mode - backtick operator not available, using slower non-system-call '.$algorithm.' algorithm');
600                                 break;
601                         }
602                         return substr(`$commandline`, 0, $hash_length);
603                 }
604
605                 if (empty($tempdir)) {
606                         // yes this is ugly, feel free to suggest a better way
607                         require_once(dirname(__FILE__).'/getid3.php');
608                         $getid3_temp = new getID3();
609                         $tempdir = $getid3_temp->tempdir;
610                         unset($getid3_temp);
611                 }
612                 // try to create a temporary file in the system temp directory - invalid dirname should force to system temp dir
613                 if (($data_filename = tempnam($tempdir, 'gI3')) === false) {
614                         // can't find anywhere to create a temp file, just fail
615                         return false;
616                 }
617
618                 // Init
619                 $result = false;
620
621                 // copy parts of file
622                 try {
623                         self::CopyFileParts($file, $data_filename, $offset, $end - $offset);
624                         $result = $hash_function($data_filename);
625                 } catch (Exception $e) {
626                         throw new Exception('self::CopyFileParts() failed in getid_lib::hash_data(): '.$e->getMessage());
627                 }
628                 unlink($data_filename);
629                 return $result;
630         }
631
632         public static function CopyFileParts($filename_source, $filename_dest, $offset, $length) {
633                 if (!self::intValueSupported($offset + $length)) {
634                         throw new Exception('cannot copy file portion, it extends beyond the '.round(PHP_INT_MAX / 1073741824).'GB limit');
635                 }
636                 if (is_readable($filename_source) && is_file($filename_source) && ($fp_src = fopen($filename_source, 'rb'))) {
637                         if (($fp_dest = fopen($filename_dest, 'wb'))) {
638                                 if (fseek($fp_src, $offset, SEEK_SET) == 0) {
639                                         $byteslefttowrite = $length;
640                                         while (($byteslefttowrite > 0) && ($buffer = fread($fp_src, min($byteslefttowrite, getID3::FREAD_BUFFER_SIZE)))) {
641                                                 $byteswritten = fwrite($fp_dest, $buffer, $byteslefttowrite);
642                                                 $byteslefttowrite -= $byteswritten;
643                                         }
644                                         return true;
645                                 } else {
646                                         throw new Exception('failed to seek to offset '.$offset.' in '.$filename_source);
647                                 }
648                                 fclose($fp_dest);
649                         } else {
650                                 throw new Exception('failed to create file for writing '.$filename_dest);
651                         }
652                         fclose($fp_src);
653                 } else {
654                         throw new Exception('failed to open file for reading '.$filename_source);
655                 }
656                 return false;
657         }
658
659         public static function iconv_fallback_int_utf8($charval) {
660                 if ($charval < 128) {
661                         // 0bbbbbbb
662                         $newcharstring = chr($charval);
663                 } elseif ($charval < 2048) {
664                         // 110bbbbb 10bbbbbb
665                         $newcharstring  = chr(($charval >>   6) | 0xC0);
666                         $newcharstring .= chr(($charval & 0x3F) | 0x80);
667                 } elseif ($charval < 65536) {
668                         // 1110bbbb 10bbbbbb 10bbbbbb
669                         $newcharstring  = chr(($charval >>  12) | 0xE0);
670                         $newcharstring .= chr(($charval >>   6) | 0xC0);
671                         $newcharstring .= chr(($charval & 0x3F) | 0x80);
672                 } else {
673                         // 11110bbb 10bbbbbb 10bbbbbb 10bbbbbb
674                         $newcharstring  = chr(($charval >>  18) | 0xF0);
675                         $newcharstring .= chr(($charval >>  12) | 0xC0);
676                         $newcharstring .= chr(($charval >>   6) | 0xC0);
677                         $newcharstring .= chr(($charval & 0x3F) | 0x80);
678                 }
679                 return $newcharstring;
680         }
681
682         // ISO-8859-1 => UTF-8
683         public static function iconv_fallback_iso88591_utf8($string, $bom=false) {
684                 if (function_exists('utf8_encode')) {
685                         return utf8_encode($string);
686                 }
687                 // utf8_encode() unavailable, use getID3()'s iconv_fallback() conversions (possibly PHP is compiled without XML support)
688                 $newcharstring = '';
689                 if ($bom) {
690                         $newcharstring .= "\xEF\xBB\xBF";
691                 }
692                 for ($i = 0; $i < strlen($string); $i++) {
693                         $charval = ord($string{$i});
694                         $newcharstring .= self::iconv_fallback_int_utf8($charval);
695                 }
696                 return $newcharstring;
697         }
698
699         // ISO-8859-1 => UTF-16BE
700         public static function iconv_fallback_iso88591_utf16be($string, $bom=false) {
701                 $newcharstring = '';
702                 if ($bom) {
703                         $newcharstring .= "\xFE\xFF";
704                 }
705                 for ($i = 0; $i < strlen($string); $i++) {
706                         $newcharstring .= "\x00".$string{$i};
707                 }
708                 return $newcharstring;
709         }
710
711         // ISO-8859-1 => UTF-16LE
712         public static function iconv_fallback_iso88591_utf16le($string, $bom=false) {
713                 $newcharstring = '';
714                 if ($bom) {
715                         $newcharstring .= "\xFF\xFE";
716                 }
717                 for ($i = 0; $i < strlen($string); $i++) {
718                         $newcharstring .= $string{$i}."\x00";
719                 }
720                 return $newcharstring;
721         }
722
723         // ISO-8859-1 => UTF-16LE (BOM)
724         public static function iconv_fallback_iso88591_utf16($string) {
725                 return self::iconv_fallback_iso88591_utf16le($string, true);
726         }
727
728         // UTF-8 => ISO-8859-1
729         public static function iconv_fallback_utf8_iso88591($string) {
730                 if (function_exists('utf8_decode')) {
731                         return utf8_decode($string);
732                 }
733                 // utf8_decode() unavailable, use getID3()'s iconv_fallback() conversions (possibly PHP is compiled without XML support)
734                 $newcharstring = '';
735                 $offset = 0;
736                 $stringlength = strlen($string);
737                 while ($offset < $stringlength) {
738                         if ((ord($string{$offset}) | 0x07) == 0xF7) {
739                                 // 11110bbb 10bbbbbb 10bbbbbb 10bbbbbb
740                                 $charval = ((ord($string{($offset + 0)}) & 0x07) << 18) &
741                                                    ((ord($string{($offset + 1)}) & 0x3F) << 12) &
742                                                    ((ord($string{($offset + 2)}) & 0x3F) <<  6) &
743                                                         (ord($string{($offset + 3)}) & 0x3F);
744                                 $offset += 4;
745                         } elseif ((ord($string{$offset}) | 0x0F) == 0xEF) {
746                                 // 1110bbbb 10bbbbbb 10bbbbbb
747                                 $charval = ((ord($string{($offset + 0)}) & 0x0F) << 12) &
748                                                    ((ord($string{($offset + 1)}) & 0x3F) <<  6) &
749                                                         (ord($string{($offset + 2)}) & 0x3F);
750                                 $offset += 3;
751                         } elseif ((ord($string{$offset}) | 0x1F) == 0xDF) {
752                                 // 110bbbbb 10bbbbbb
753                                 $charval = ((ord($string{($offset + 0)}) & 0x1F) <<  6) &
754                                                         (ord($string{($offset + 1)}) & 0x3F);
755                                 $offset += 2;
756                         } elseif ((ord($string{$offset}) | 0x7F) == 0x7F) {
757                                 // 0bbbbbbb
758                                 $charval = ord($string{$offset});
759                                 $offset += 1;
760                         } else {
761                                 // error? throw some kind of warning here?
762                                 $charval = false;
763                                 $offset += 1;
764                         }
765                         if ($charval !== false) {
766                                 $newcharstring .= (($charval < 256) ? chr($charval) : '?');
767                         }
768                 }
769                 return $newcharstring;
770         }
771
772         // UTF-8 => UTF-16BE
773         public static function iconv_fallback_utf8_utf16be($string, $bom=false) {
774                 $newcharstring = '';
775                 if ($bom) {
776                         $newcharstring .= "\xFE\xFF";
777                 }
778                 $offset = 0;
779                 $stringlength = strlen($string);
780                 while ($offset < $stringlength) {
781                         if ((ord($string{$offset}) | 0x07) == 0xF7) {
782                                 // 11110bbb 10bbbbbb 10bbbbbb 10bbbbbb
783                                 $charval = ((ord($string{($offset + 0)}) & 0x07) << 18) &
784                                                    ((ord($string{($offset + 1)}) & 0x3F) << 12) &
785                                                    ((ord($string{($offset + 2)}) & 0x3F) <<  6) &
786                                                         (ord($string{($offset + 3)}) & 0x3F);
787                                 $offset += 4;
788                         } elseif ((ord($string{$offset}) | 0x0F) == 0xEF) {
789                                 // 1110bbbb 10bbbbbb 10bbbbbb
790                                 $charval = ((ord($string{($offset + 0)}) & 0x0F) << 12) &
791                                                    ((ord($string{($offset + 1)}) & 0x3F) <<  6) &
792                                                         (ord($string{($offset + 2)}) & 0x3F);
793                                 $offset += 3;
794                         } elseif ((ord($string{$offset}) | 0x1F) == 0xDF) {
795                                 // 110bbbbb 10bbbbbb
796                                 $charval = ((ord($string{($offset + 0)}) & 0x1F) <<  6) &
797                                                         (ord($string{($offset + 1)}) & 0x3F);
798                                 $offset += 2;
799                         } elseif ((ord($string{$offset}) | 0x7F) == 0x7F) {
800                                 // 0bbbbbbb
801                                 $charval = ord($string{$offset});
802                                 $offset += 1;
803                         } else {
804                                 // error? throw some kind of warning here?
805                                 $charval = false;
806                                 $offset += 1;
807                         }
808                         if ($charval !== false) {
809                                 $newcharstring .= (($charval < 65536) ? self::BigEndian2String($charval, 2) : "\x00".'?');
810                         }
811                 }
812                 return $newcharstring;
813         }
814
815         // UTF-8 => UTF-16LE
816         public static function iconv_fallback_utf8_utf16le($string, $bom=false) {
817                 $newcharstring = '';
818                 if ($bom) {
819                         $newcharstring .= "\xFF\xFE";
820                 }
821                 $offset = 0;
822                 $stringlength = strlen($string);
823                 while ($offset < $stringlength) {
824                         if ((ord($string{$offset}) | 0x07) == 0xF7) {
825                                 // 11110bbb 10bbbbbb 10bbbbbb 10bbbbbb
826                                 $charval = ((ord($string{($offset + 0)}) & 0x07) << 18) &
827                                                    ((ord($string{($offset + 1)}) & 0x3F) << 12) &
828                                                    ((ord($string{($offset + 2)}) & 0x3F) <<  6) &
829                                                         (ord($string{($offset + 3)}) & 0x3F);
830                                 $offset += 4;
831                         } elseif ((ord($string{$offset}) | 0x0F) == 0xEF) {
832                                 // 1110bbbb 10bbbbbb 10bbbbbb
833                                 $charval = ((ord($string{($offset + 0)}) & 0x0F) << 12) &
834                                                    ((ord($string{($offset + 1)}) & 0x3F) <<  6) &
835                                                         (ord($string{($offset + 2)}) & 0x3F);
836                                 $offset += 3;
837                         } elseif ((ord($string{$offset}) | 0x1F) == 0xDF) {
838                                 // 110bbbbb 10bbbbbb
839                                 $charval = ((ord($string{($offset + 0)}) & 0x1F) <<  6) &
840                                                         (ord($string{($offset + 1)}) & 0x3F);
841                                 $offset += 2;
842                         } elseif ((ord($string{$offset}) | 0x7F) == 0x7F) {
843                                 // 0bbbbbbb
844                                 $charval = ord($string{$offset});
845                                 $offset += 1;
846                         } else {
847                                 // error? maybe throw some warning here?
848                                 $charval = false;
849                                 $offset += 1;
850                         }
851                         if ($charval !== false) {
852                                 $newcharstring .= (($charval < 65536) ? self::LittleEndian2String($charval, 2) : '?'."\x00");
853                         }
854                 }
855                 return $newcharstring;
856         }
857
858         // UTF-8 => UTF-16LE (BOM)
859         public static function iconv_fallback_utf8_utf16($string) {
860                 return self::iconv_fallback_utf8_utf16le($string, true);
861         }
862
863         // UTF-16BE => UTF-8
864         public static function iconv_fallback_utf16be_utf8($string) {
865                 if (substr($string, 0, 2) == "\xFE\xFF") {
866                         // strip BOM
867                         $string = substr($string, 2);
868                 }
869                 $newcharstring = '';
870                 for ($i = 0; $i < strlen($string); $i += 2) {
871                         $charval = self::BigEndian2Int(substr($string, $i, 2));
872                         $newcharstring .= self::iconv_fallback_int_utf8($charval);
873                 }
874                 return $newcharstring;
875         }
876
877         // UTF-16LE => UTF-8
878         public static function iconv_fallback_utf16le_utf8($string) {
879                 if (substr($string, 0, 2) == "\xFF\xFE") {
880                         // strip BOM
881                         $string = substr($string, 2);
882                 }
883                 $newcharstring = '';
884                 for ($i = 0; $i < strlen($string); $i += 2) {
885                         $charval = self::LittleEndian2Int(substr($string, $i, 2));
886                         $newcharstring .= self::iconv_fallback_int_utf8($charval);
887                 }
888                 return $newcharstring;
889         }
890
891         // UTF-16BE => ISO-8859-1
892         public static function iconv_fallback_utf16be_iso88591($string) {
893                 if (substr($string, 0, 2) == "\xFE\xFF") {
894                         // strip BOM
895                         $string = substr($string, 2);
896                 }
897                 $newcharstring = '';
898                 for ($i = 0; $i < strlen($string); $i += 2) {
899                         $charval = self::BigEndian2Int(substr($string, $i, 2));
900                         $newcharstring .= (($charval < 256) ? chr($charval) : '?');
901                 }
902                 return $newcharstring;
903         }
904
905         // UTF-16LE => ISO-8859-1
906         public static function iconv_fallback_utf16le_iso88591($string) {
907                 if (substr($string, 0, 2) == "\xFF\xFE") {
908                         // strip BOM
909                         $string = substr($string, 2);
910                 }
911                 $newcharstring = '';
912                 for ($i = 0; $i < strlen($string); $i += 2) {
913                         $charval = self::LittleEndian2Int(substr($string, $i, 2));
914                         $newcharstring .= (($charval < 256) ? chr($charval) : '?');
915                 }
916                 return $newcharstring;
917         }
918
919         // UTF-16 (BOM) => ISO-8859-1
920         public static function iconv_fallback_utf16_iso88591($string) {
921                 $bom = substr($string, 0, 2);
922                 if ($bom == "\xFE\xFF") {
923                         return self::iconv_fallback_utf16be_iso88591(substr($string, 2));
924                 } elseif ($bom == "\xFF\xFE") {
925                         return self::iconv_fallback_utf16le_iso88591(substr($string, 2));
926                 }
927                 return $string;
928         }
929
930         // UTF-16 (BOM) => UTF-8
931         public static function iconv_fallback_utf16_utf8($string) {
932                 $bom = substr($string, 0, 2);
933                 if ($bom == "\xFE\xFF") {
934                         return self::iconv_fallback_utf16be_utf8(substr($string, 2));
935                 } elseif ($bom == "\xFF\xFE") {
936                         return self::iconv_fallback_utf16le_utf8(substr($string, 2));
937                 }
938                 return $string;
939         }
940
941         public static function iconv_fallback($in_charset, $out_charset, $string) {
942
943                 if ($in_charset == $out_charset) {
944                         return $string;
945                 }
946
947                 // iconv() availble
948                 if (function_exists('iconv')) {
949                         if ($converted_string = @iconv($in_charset, $out_charset.'//TRANSLIT', $string)) {
950                                 switch ($out_charset) {
951                                         case 'ISO-8859-1':
952                                                 $converted_string = rtrim($converted_string, "\x00");
953                                                 break;
954                                 }
955                                 return $converted_string;
956                         }
957
958                         // iconv() may sometimes fail with "illegal character in input string" error message
959                         // and return an empty string, but returning the unconverted string is more useful
960                         return $string;
961                 }
962
963
964                 // iconv() not available
965                 static $ConversionFunctionList = array();
966                 if (empty($ConversionFunctionList)) {
967                         $ConversionFunctionList['ISO-8859-1']['UTF-8']    = 'iconv_fallback_iso88591_utf8';
968                         $ConversionFunctionList['ISO-8859-1']['UTF-16']   = 'iconv_fallback_iso88591_utf16';
969                         $ConversionFunctionList['ISO-8859-1']['UTF-16BE'] = 'iconv_fallback_iso88591_utf16be';
970                         $ConversionFunctionList['ISO-8859-1']['UTF-16LE'] = 'iconv_fallback_iso88591_utf16le';
971                         $ConversionFunctionList['UTF-8']['ISO-8859-1']    = 'iconv_fallback_utf8_iso88591';
972                         $ConversionFunctionList['UTF-8']['UTF-16']        = 'iconv_fallback_utf8_utf16';
973                         $ConversionFunctionList['UTF-8']['UTF-16BE']      = 'iconv_fallback_utf8_utf16be';
974                         $ConversionFunctionList['UTF-8']['UTF-16LE']      = 'iconv_fallback_utf8_utf16le';
975                         $ConversionFunctionList['UTF-16']['ISO-8859-1']   = 'iconv_fallback_utf16_iso88591';
976                         $ConversionFunctionList['UTF-16']['UTF-8']        = 'iconv_fallback_utf16_utf8';
977                         $ConversionFunctionList['UTF-16LE']['ISO-8859-1'] = 'iconv_fallback_utf16le_iso88591';
978                         $ConversionFunctionList['UTF-16LE']['UTF-8']      = 'iconv_fallback_utf16le_utf8';
979                         $ConversionFunctionList['UTF-16BE']['ISO-8859-1'] = 'iconv_fallback_utf16be_iso88591';
980                         $ConversionFunctionList['UTF-16BE']['UTF-8']      = 'iconv_fallback_utf16be_utf8';
981                 }
982                 if (isset($ConversionFunctionList[strtoupper($in_charset)][strtoupper($out_charset)])) {
983                         $ConversionFunction = $ConversionFunctionList[strtoupper($in_charset)][strtoupper($out_charset)];
984                         return self::$ConversionFunction($string);
985                 }
986                 throw new Exception('PHP does not have iconv() support - cannot convert from '.$in_charset.' to '.$out_charset);
987         }
988
989
990         public static function MultiByteCharString2HTML($string, $charset='ISO-8859-1') {
991                 $string = (string) $string; // in case trying to pass a numeric (float, int) string, would otherwise return an empty string
992                 $HTMLstring = '';
993
994                 switch ($charset) {
995                         case '1251':
996                         case '1252':
997                         case '866':
998                         case '932':
999                         case '936':
1000                         case '950':
1001                         case 'BIG5':
1002                         case 'BIG5-HKSCS':
1003                         case 'cp1251':
1004                         case 'cp1252':
1005                         case 'cp866':
1006                         case 'EUC-JP':
1007                         case 'EUCJP':
1008                         case 'GB2312':
1009                         case 'ibm866':
1010                         case 'ISO-8859-1':
1011                         case 'ISO-8859-15':
1012                         case 'ISO8859-1':
1013                         case 'ISO8859-15':
1014                         case 'KOI8-R':
1015                         case 'koi8-ru':
1016                         case 'koi8r':
1017                         case 'Shift_JIS':
1018                         case 'SJIS':
1019                         case 'win-1251':
1020                         case 'Windows-1251':
1021                         case 'Windows-1252':
1022                                 $HTMLstring = htmlentities($string, ENT_COMPAT, $charset);
1023                                 break;
1024
1025                         case 'UTF-8':
1026                                 $strlen = strlen($string);
1027                                 for ($i = 0; $i < $strlen; $i++) {
1028                                         $char_ord_val = ord($string{$i});
1029                                         $charval = 0;
1030                                         if ($char_ord_val < 0x80) {
1031                                                 $charval = $char_ord_val;
1032                                         } elseif ((($char_ord_val & 0xF0) >> 4) == 0x0F  &&  $i+3 < $strlen) {
1033                                                 $charval  = (($char_ord_val & 0x07) << 18);
1034                                                 $charval += ((ord($string{++$i}) & 0x3F) << 12);
1035                                                 $charval += ((ord($string{++$i}) & 0x3F) << 6);
1036                                                 $charval +=  (ord($string{++$i}) & 0x3F);
1037                                         } elseif ((($char_ord_val & 0xE0) >> 5) == 0x07  &&  $i+2 < $strlen) {
1038                                                 $charval  = (($char_ord_val & 0x0F) << 12);
1039                                                 $charval += ((ord($string{++$i}) & 0x3F) << 6);
1040                                                 $charval +=  (ord($string{++$i}) & 0x3F);
1041                                         } elseif ((($char_ord_val & 0xC0) >> 6) == 0x03  &&  $i+1 < $strlen) {
1042                                                 $charval  = (($char_ord_val & 0x1F) << 6);
1043                                                 $charval += (ord($string{++$i}) & 0x3F);
1044                                         }
1045                                         if (($charval >= 32) && ($charval <= 127)) {
1046                                                 $HTMLstring .= htmlentities(chr($charval));
1047                                         } else {
1048                                                 $HTMLstring .= '&#'.$charval.';';
1049                                         }
1050                                 }
1051                                 break;
1052
1053                         case 'UTF-16LE':
1054                                 for ($i = 0; $i < strlen($string); $i += 2) {
1055                                         $charval = self::LittleEndian2Int(substr($string, $i, 2));
1056                                         if (($charval >= 32) && ($charval <= 127)) {
1057                                                 $HTMLstring .= chr($charval);
1058                                         } else {
1059                                                 $HTMLstring .= '&#'.$charval.';';
1060                                         }
1061                                 }
1062                                 break;
1063
1064                         case 'UTF-16BE':
1065                                 for ($i = 0; $i < strlen($string); $i += 2) {
1066                                         $charval = self::BigEndian2Int(substr($string, $i, 2));
1067                                         if (($charval >= 32) && ($charval <= 127)) {
1068                                                 $HTMLstring .= chr($charval);
1069                                         } else {
1070                                                 $HTMLstring .= '&#'.$charval.';';
1071                                         }
1072                                 }
1073                                 break;
1074
1075                         default:
1076                                 $HTMLstring = 'ERROR: Character set "'.$charset.'" not supported in MultiByteCharString2HTML()';
1077                                 break;
1078                 }
1079                 return $HTMLstring;
1080         }
1081
1082
1083
1084         public static function RGADnameLookup($namecode) {
1085                 static $RGADname = array();
1086                 if (empty($RGADname)) {
1087                         $RGADname[0] = 'not set';
1088                         $RGADname[1] = 'Track Gain Adjustment';
1089                         $RGADname[2] = 'Album Gain Adjustment';
1090                 }
1091
1092                 return (isset($RGADname[$namecode]) ? $RGADname[$namecode] : '');
1093         }
1094
1095
1096         public static function RGADoriginatorLookup($originatorcode) {
1097                 static $RGADoriginator = array();
1098                 if (empty($RGADoriginator)) {
1099                         $RGADoriginator[0] = 'unspecified';
1100                         $RGADoriginator[1] = 'pre-set by artist/producer/mastering engineer';
1101                         $RGADoriginator[2] = 'set by user';
1102                         $RGADoriginator[3] = 'determined automatically';
1103                 }
1104
1105                 return (isset($RGADoriginator[$originatorcode]) ? $RGADoriginator[$originatorcode] : '');
1106         }
1107
1108
1109         public static function RGADadjustmentLookup($rawadjustment, $signbit) {
1110                 $adjustment = $rawadjustment / 10;
1111                 if ($signbit == 1) {
1112                         $adjustment *= -1;
1113                 }
1114                 return (float) $adjustment;
1115         }
1116
1117
1118         public static function RGADgainString($namecode, $originatorcode, $replaygain) {
1119                 if ($replaygain < 0) {
1120                         $signbit = '1';
1121                 } else {
1122                         $signbit = '0';
1123                 }
1124                 $storedreplaygain = intval(round($replaygain * 10));
1125                 $gainstring  = str_pad(decbin($namecode), 3, '0', STR_PAD_LEFT);
1126                 $gainstring .= str_pad(decbin($originatorcode), 3, '0', STR_PAD_LEFT);
1127                 $gainstring .= $signbit;
1128                 $gainstring .= str_pad(decbin($storedreplaygain), 9, '0', STR_PAD_LEFT);
1129
1130                 return $gainstring;
1131         }
1132
1133         public static function RGADamplitude2dB($amplitude) {
1134                 return 20 * log10($amplitude);
1135         }
1136
1137
1138         public static function GetDataImageSize($imgData, &$imageinfo=array()) {
1139                 static $tempdir = '';
1140                 if (empty($tempdir)) {
1141                         // yes this is ugly, feel free to suggest a better way
1142                         require_once(dirname(__FILE__).'/getid3.php');
1143                         $getid3_temp = new getID3();
1144                         $tempdir = $getid3_temp->tempdir;
1145                         unset($getid3_temp);
1146                 }
1147                 $GetDataImageSize = false;
1148                 if ($tempfilename = tempnam($tempdir, 'gI3')) {
1149                         if (is_writable($tempfilename) && is_file($tempfilename) && ($tmp = fopen($tempfilename, 'wb'))) {
1150                                 fwrite($tmp, $imgData);
1151                                 fclose($tmp);
1152                                 $GetDataImageSize = @getimagesize($tempfilename, $imageinfo);
1153                         }
1154                         unlink($tempfilename);
1155                 }
1156                 return $GetDataImageSize;
1157         }
1158
1159         public static function ImageExtFromMime($mime_type) {
1160                 // temporary way, works OK for now, but should be reworked in the future
1161                 return str_replace(array('image/', 'x-', 'jpeg'), array('', '', 'jpg'), $mime_type);
1162         }
1163
1164         public static function ImageTypesLookup($imagetypeid) {
1165                 static $ImageTypesLookup = array();
1166                 if (empty($ImageTypesLookup)) {
1167                         $ImageTypesLookup[1]  = 'gif';
1168                         $ImageTypesLookup[2]  = 'jpeg';
1169                         $ImageTypesLookup[3]  = 'png';
1170                         $ImageTypesLookup[4]  = 'swf';
1171                         $ImageTypesLookup[5]  = 'psd';
1172                         $ImageTypesLookup[6]  = 'bmp';
1173                         $ImageTypesLookup[7]  = 'tiff (little-endian)';
1174                         $ImageTypesLookup[8]  = 'tiff (big-endian)';
1175                         $ImageTypesLookup[9]  = 'jpc';
1176                         $ImageTypesLookup[10] = 'jp2';
1177                         $ImageTypesLookup[11] = 'jpx';
1178                         $ImageTypesLookup[12] = 'jb2';
1179                         $ImageTypesLookup[13] = 'swc';
1180                         $ImageTypesLookup[14] = 'iff';
1181                 }
1182                 return (isset($ImageTypesLookup[$imagetypeid]) ? $ImageTypesLookup[$imagetypeid] : '');
1183         }
1184
1185         public static function CopyTagsToComments(&$ThisFileInfo) {
1186
1187                 // Copy all entries from ['tags'] into common ['comments']
1188                 if (!empty($ThisFileInfo['tags'])) {
1189                         foreach ($ThisFileInfo['tags'] as $tagtype => $tagarray) {
1190                                 foreach ($tagarray as $tagname => $tagdata) {
1191                                         foreach ($tagdata as $key => $value) {
1192                                                 if (!empty($value)) {
1193                                                         if (empty($ThisFileInfo['comments'][$tagname])) {
1194
1195                                                                 // fall through and append value
1196
1197                                                         } elseif ($tagtype == 'id3v1') {
1198
1199                                                                 $newvaluelength = strlen(trim($value));
1200                                                                 foreach ($ThisFileInfo['comments'][$tagname] as $existingkey => $existingvalue) {
1201                                                                         $oldvaluelength = strlen(trim($existingvalue));
1202                                                                         if (($newvaluelength <= $oldvaluelength) && (substr($existingvalue, 0, $newvaluelength) == trim($value))) {
1203                                                                                 // new value is identical but shorter-than (or equal-length to) one already in comments - skip
1204                                                                                 break 2;
1205                                                                         }
1206                                                                 }
1207
1208                                                         } elseif (!is_array($value)) {
1209
1210                                                                 $newvaluelength = strlen(trim($value));
1211                                                                 foreach ($ThisFileInfo['comments'][$tagname] as $existingkey => $existingvalue) {
1212                                                                         $oldvaluelength = strlen(trim($existingvalue));
1213                                                                         if (($newvaluelength > $oldvaluelength) && (substr(trim($value), 0, strlen($existingvalue)) == $existingvalue)) {
1214                                                                                 $ThisFileInfo['comments'][$tagname][$existingkey] = trim($value);
1215                                                                                 break 2;
1216                                                                         }
1217                                                                 }
1218
1219                                                         }
1220                                                         if (is_array($value) || empty($ThisFileInfo['comments'][$tagname]) || !in_array(trim($value), $ThisFileInfo['comments'][$tagname])) {
1221                                                                 $value = (is_string($value) ? trim($value) : $value);
1222                                                                 $ThisFileInfo['comments'][$tagname][] = $value;
1223                                                         }
1224                                                 }
1225                                         }
1226                                 }
1227                         }
1228
1229                         // Copy to ['comments_html']
1230                         foreach ($ThisFileInfo['comments'] as $field => $values) {
1231                                 if ($field == 'picture') {
1232                                         // pictures can take up a lot of space, and we don't need multiple copies of them
1233                                         // let there be a single copy in [comments][picture], and not elsewhere
1234                                         continue;
1235                                 }
1236                                 foreach ($values as $index => $value) {
1237                                         if (is_array($value)) {
1238                                                 $ThisFileInfo['comments_html'][$field][$index] = $value;
1239                                         } else {
1240                                                 $ThisFileInfo['comments_html'][$field][$index] = str_replace('&#0;', '', self::MultiByteCharString2HTML($value, $ThisFileInfo['encoding']));
1241                                         }
1242                                 }
1243                         }
1244                 }
1245                 return true;
1246         }
1247
1248
1249         public static function EmbeddedLookup($key, $begin, $end, $file, $name) {
1250
1251                 // Cached
1252                 static $cache;
1253                 if (isset($cache[$file][$name])) {
1254                         return (isset($cache[$file][$name][$key]) ? $cache[$file][$name][$key] : '');
1255                 }
1256
1257                 // Init
1258                 $keylength  = strlen($key);
1259                 $line_count = $end - $begin - 7;
1260
1261                 // Open php file
1262                 $fp = fopen($file, 'r');
1263
1264                 // Discard $begin lines
1265                 for ($i = 0; $i < ($begin + 3); $i++) {
1266                         fgets($fp, 1024);
1267                 }
1268
1269                 // Loop thru line
1270                 while (0 < $line_count--) {
1271
1272                         // Read line
1273                         $line = ltrim(fgets($fp, 1024), "\t ");
1274
1275                         // METHOD A: only cache the matching key - less memory but slower on next lookup of not-previously-looked-up key
1276                         //$keycheck = substr($line, 0, $keylength);
1277                         //if ($key == $keycheck)  {
1278                         //      $cache[$file][$name][$keycheck] = substr($line, $keylength + 1);
1279                         //      break;
1280                         //}
1281
1282                         // METHOD B: cache all keys in this lookup - more memory but faster on next lookup of not-previously-looked-up key
1283                         //$cache[$file][$name][substr($line, 0, $keylength)] = trim(substr($line, $keylength + 1));
1284                         $explodedLine = explode("\t", $line, 2);
1285                         $ThisKey   = (isset($explodedLine[0]) ? $explodedLine[0] : '');
1286                         $ThisValue = (isset($explodedLine[1]) ? $explodedLine[1] : '');
1287                         $cache[$file][$name][$ThisKey] = trim($ThisValue);
1288                 }
1289
1290                 // Close and return
1291                 fclose($fp);
1292                 return (isset($cache[$file][$name][$key]) ? $cache[$file][$name][$key] : '');
1293         }
1294
1295         public static function IncludeDependency($filename, $sourcefile, $DieOnFailure=false) {
1296                 global $GETID3_ERRORARRAY;
1297
1298                 if (file_exists($filename)) {
1299                         if (include_once($filename)) {
1300                                 return true;
1301                         } else {
1302                                 $diemessage = basename($sourcefile).' depends on '.$filename.', which has errors';
1303                         }
1304                 } else {
1305                         $diemessage = basename($sourcefile).' depends on '.$filename.', which is missing';
1306                 }
1307                 if ($DieOnFailure) {
1308                         throw new Exception($diemessage);
1309                 } else {
1310                         $GETID3_ERRORARRAY[] = $diemessage;
1311                 }
1312                 return false;
1313         }
1314
1315         public static function trimNullByte($string) {
1316                 return trim($string, "\x00");
1317         }
1318
1319         public static function getFileSizeSyscall($path) {
1320                 $filesize = false;
1321
1322                 if (GETID3_OS_ISWINDOWS) {
1323                         if (class_exists('COM')) { // From PHP 5.3.15 and 5.4.5, COM and DOTNET is no longer built into the php core.you have to add COM support in php.ini:
1324                                 $filesystem = new COM('Scripting.FileSystemObject');
1325                                 $file = $filesystem->GetFile($path);
1326                                 $filesize = $file->Size();
1327                                 unset($filesystem, $file);
1328                         } else {
1329                                 $commandline = 'for %I in ('.escapeshellarg($path).') do @echo %~zI';
1330                         }
1331                 } else {
1332                         $commandline = 'ls -l '.escapeshellarg($path).' | awk \'{print $5}\'';
1333                 }
1334                 if (isset($commandline)) {
1335                         $output = trim(`$commandline`);
1336                         if (ctype_digit($output)) {
1337                                 $filesize = (float) $output;
1338                         }
1339                 }
1340                 return $filesize;
1341         }
1342 }