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Source: /modules/getid3/getid3.lib.php - 1379 lines - 44677 bytes - Summary - Text - Print

Description: part of getID3()                           //

   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  //          also https://github.com/JamesHeinrich/getID3       //
   7  /////////////////////////////////////////////////////////////////
   8  //                                                             //
   9  // getid3.lib.php - part of getID3()                           //
  10  // See readme.txt for more details                             //
  11  //                                                            ///
  12  /////////////////////////////////////////////////////////////////
  13  
  14  
  15  class getid3_lib
  16  {
  17  
  18  	public static function PrintHexBytes($string, $hex=true, $spaces=true, $htmlencoding='UTF-8') {
  19          $returnstring = '';
  20          for ($i = 0; $i < strlen($string); $i++) {
  21              if ($hex) {
  22                  $returnstring .= str_pad(dechex(ord($string{$i})), 2, '0', STR_PAD_LEFT);
  23              } else {
  24                  $returnstring .= ' '.(preg_match("#[\x20-\x7E]#", $string{$i}) ? $string{$i} : '¤');
  25              }
  26              if ($spaces) {
  27                  $returnstring .= ' ';
  28              }
  29          }
  30          if (!empty($htmlencoding)) {
  31              if ($htmlencoding === true) {
  32                  $htmlencoding = 'UTF-8'; // prior to getID3 v1.9.0 the function's 4th parameter was boolean
  33              }
  34              $returnstring = htmlentities($returnstring, ENT_QUOTES, $htmlencoding);
  35          }
  36          return $returnstring;
  37      }
  38  
  39  	public static function trunc($floatnumber) {
  40          // truncates a floating-point number at the decimal point
  41          // returns int (if possible, otherwise float)
  42          if ($floatnumber >= 1) {
  43              $truncatednumber = floor($floatnumber);
  44          } elseif ($floatnumber <= -1) {
  45              $truncatednumber = ceil($floatnumber);
  46          } else {
  47              $truncatednumber = 0;
  48          }
  49          if (self::intValueSupported($truncatednumber)) {
  50              $truncatednumber = (int) $truncatednumber;
  51          }
  52          return $truncatednumber;
  53      }
  54  
  55  
  56  	public static function safe_inc(&$variable, $increment=1) {
  57          if (isset($variable)) {
  58              $variable += $increment;
  59          } else {
  60              $variable = $increment;
  61          }
  62          return true;
  63      }
  64  
  65  	public static function CastAsInt($floatnum) {
  66          // convert to float if not already
  67          $floatnum = (float) $floatnum;
  68  
  69          // convert a float to type int, only if possible
  70          if (self::trunc($floatnum) == $floatnum) {
  71              // it's not floating point
  72              if (self::intValueSupported($floatnum)) {
  73                  // it's within int range
  74                  $floatnum = (int) $floatnum;
  75              }
  76          }
  77          return $floatnum;
  78      }
  79  
  80  	public static function intValueSupported($num) {
  81          // check if integers are 64-bit
  82          static $hasINT64 = null;
  83          if ($hasINT64 === null) { // 10x faster than is_null()
  84              $hasINT64 = is_int(pow(2, 31)); // 32-bit int are limited to (2^31)-1
  85              if (!$hasINT64 && !defined('PHP_INT_MIN')) {
  86                  define('PHP_INT_MIN', ~PHP_INT_MAX);
  87              }
  88          }
  89          // if integers are 64-bit - no other check required
  90          if ($hasINT64 || (($num <= PHP_INT_MAX) && ($num >= PHP_INT_MIN))) {
  91              return true;
  92          }
  93          return false;
  94      }
  95  
  96  	public static function DecimalizeFraction($fraction) {
  97          list($numerator, $denominator) = explode('/', $fraction);
  98          return $numerator / ($denominator ? $denominator : 1);
  99      }
 100  
 101  
 102  	public static function DecimalBinary2Float($binarynumerator) {
 103          $numerator   = self::Bin2Dec($binarynumerator);
 104          $denominator = self::Bin2Dec('1'.str_repeat('0', strlen($binarynumerator)));
 105          return ($numerator / $denominator);
 106      }
 107  
 108  
 109  	public static function NormalizeBinaryPoint($binarypointnumber, $maxbits=52) {
 110          // http://www.scri.fsu.edu/~jac/MAD3401/Backgrnd/binary.html
 111          if (strpos($binarypointnumber, '.') === false) {
 112              $binarypointnumber = '0.'.$binarypointnumber;
 113          } elseif ($binarypointnumber{0} == '.') {
 114              $binarypointnumber = '0'.$binarypointnumber;
 115          }
 116          $exponent = 0;
 117          while (($binarypointnumber{0} != '1') || (substr($binarypointnumber, 1, 1) != '.')) {
 118              if (substr($binarypointnumber, 1, 1) == '.') {
 119                  $exponent--;
 120                  $binarypointnumber = substr($binarypointnumber, 2, 1).'.'.substr($binarypointnumber, 3);
 121              } else {
 122                  $pointpos = strpos($binarypointnumber, '.');
 123                  $exponent += ($pointpos - 1);
 124                  $binarypointnumber = str_replace('.', '', $binarypointnumber);
 125                  $binarypointnumber = $binarypointnumber{0}.'.'.substr($binarypointnumber, 1);
 126              }
 127          }
 128          $binarypointnumber = str_pad(substr($binarypointnumber, 0, $maxbits + 2), $maxbits + 2, '0', STR_PAD_RIGHT);
 129          return array('normalized'=>$binarypointnumber, 'exponent'=>(int) $exponent);
 130      }
 131  
 132  
 133  	public static function Float2BinaryDecimal($floatvalue) {
 134          // http://www.scri.fsu.edu/~jac/MAD3401/Backgrnd/binary.html
 135          $maxbits = 128; // to how many bits of precision should the calculations be taken?
 136          $intpart   = self::trunc($floatvalue);
 137          $floatpart = abs($floatvalue - $intpart);
 138          $pointbitstring = '';
 139          while (($floatpart != 0) && (strlen($pointbitstring) < $maxbits)) {
 140              $floatpart *= 2;
 141              $pointbitstring .= (string) self::trunc($floatpart);
 142              $floatpart -= self::trunc($floatpart);
 143          }
 144          $binarypointnumber = decbin($intpart).'.'.$pointbitstring;
 145          return $binarypointnumber;
 146      }
 147  
 148  
 149  	public static function Float2String($floatvalue, $bits) {
 150          // http://www.scri.fsu.edu/~jac/MAD3401/Backgrnd/ieee-expl.html
 151          switch ($bits) {
 152              case 32:
 153                  $exponentbits = 8;
 154                  $fractionbits = 23;
 155                  break;
 156  
 157              case 64:
 158                  $exponentbits = 11;
 159                  $fractionbits = 52;
 160                  break;
 161  
 162              default:
 163                  return false;
 164                  break;
 165          }
 166          if ($floatvalue >= 0) {
 167              $signbit = '0';
 168          } else {
 169              $signbit = '1';
 170          }
 171          $normalizedbinary  = self::NormalizeBinaryPoint(self::Float2BinaryDecimal($floatvalue), $fractionbits);
 172          $biasedexponent    = pow(2, $exponentbits - 1) - 1 + $normalizedbinary['exponent']; // (127 or 1023) +/- exponent
 173          $exponentbitstring = str_pad(decbin($biasedexponent), $exponentbits, '0', STR_PAD_LEFT);
 174          $fractionbitstring = str_pad(substr($normalizedbinary['normalized'], 2), $fractionbits, '0', STR_PAD_RIGHT);
 175  
 176          return self::BigEndian2String(self::Bin2Dec($signbit.$exponentbitstring.$fractionbitstring), $bits % 8, false);
 177      }
 178  
 179  
 180  	public static function LittleEndian2Float($byteword) {
 181          return self::BigEndian2Float(strrev($byteword));
 182      }
 183  
 184  
 185  	public static function BigEndian2Float($byteword) {
 186          // ANSI/IEEE Standard 754-1985, Standard for Binary Floating Point Arithmetic
 187          // http://www.psc.edu/general/software/packages/ieee/ieee.html
 188          // http://www.scri.fsu.edu/~jac/MAD3401/Backgrnd/ieee.html
 189  
 190          $bitword = self::BigEndian2Bin($byteword);
 191          if (!$bitword) {
 192              return 0;
 193          }
 194          $signbit = $bitword{0};
 195  
 196          switch (strlen($byteword) * 8) {
 197              case 32:
 198                  $exponentbits = 8;
 199                  $fractionbits = 23;
 200                  break;
 201  
 202              case 64:
 203                  $exponentbits = 11;
 204                  $fractionbits = 52;
 205                  break;
 206  
 207              case 80:
 208                  // 80-bit Apple SANE format
 209                  // http://www.mactech.com/articles/mactech/Vol.06/06.01/SANENormalized/
 210                  $exponentstring = substr($bitword, 1, 15);
 211                  $isnormalized = intval($bitword{16});
 212                  $fractionstring = substr($bitword, 17, 63);
 213                  $exponent = pow(2, self::Bin2Dec($exponentstring) - 16383);
 214                  $fraction = $isnormalized + self::DecimalBinary2Float($fractionstring);
 215                  $floatvalue = $exponent * $fraction;
 216                  if ($signbit == '1') {
 217                      $floatvalue *= -1;
 218                  }
 219                  return $floatvalue;
 220                  break;
 221  
 222              default:
 223                  return false;
 224                  break;
 225          }
 226          $exponentstring = substr($bitword, 1, $exponentbits);
 227          $fractionstring = substr($bitword, $exponentbits + 1, $fractionbits);
 228          $exponent = self::Bin2Dec($exponentstring);
 229          $fraction = self::Bin2Dec($fractionstring);
 230  
 231          if (($exponent == (pow(2, $exponentbits) - 1)) && ($fraction != 0)) {
 232              // Not a Number
 233              $floatvalue = false;
 234          } elseif (($exponent == (pow(2, $exponentbits) - 1)) && ($fraction == 0)) {
 235              if ($signbit == '1') {
 236                  $floatvalue = '-infinity';
 237              } else {
 238                  $floatvalue = '+infinity';
 239              }
 240          } elseif (($exponent == 0) && ($fraction == 0)) {
 241              if ($signbit == '1') {
 242                  $floatvalue = -0;
 243              } else {
 244                  $floatvalue = 0;
 245              }
 246              $floatvalue = ($signbit ? 0 : -0);
 247          } elseif (($exponent == 0) && ($fraction != 0)) {
 248              // These are 'unnormalized' values
 249              $floatvalue = pow(2, (-1 * (pow(2, $exponentbits - 1) - 2))) * self::DecimalBinary2Float($fractionstring);
 250              if ($signbit == '1') {
 251                  $floatvalue *= -1;
 252              }
 253          } elseif ($exponent != 0) {
 254              $floatvalue = pow(2, ($exponent - (pow(2, $exponentbits - 1) - 1))) * (1 + self::DecimalBinary2Float($fractionstring));
 255              if ($signbit == '1') {
 256                  $floatvalue *= -1;
 257              }
 258          }
 259          return (float) $floatvalue;
 260      }
 261  
 262  
 263  	public static function BigEndian2Int($byteword, $synchsafe=false, $signed=false) {
 264          $intvalue = 0;
 265          $bytewordlen = strlen($byteword);
 266          if ($bytewordlen == 0) {
 267              return false;
 268          }
 269          for ($i = 0; $i < $bytewordlen; $i++) {
 270              if ($synchsafe) { // disregard MSB, effectively 7-bit bytes
 271                  //$intvalue = $intvalue | (ord($byteword{$i}) & 0x7F) << (($bytewordlen - 1 - $i) * 7); // faster, but runs into problems past 2^31 on 32-bit systems
 272                  $intvalue += (ord($byteword{$i}) & 0x7F) * pow(2, ($bytewordlen - 1 - $i) * 7);
 273              } else {
 274                  $intvalue += ord($byteword{$i}) * pow(256, ($bytewordlen - 1 - $i));
 275              }
 276          }
 277          if ($signed && !$synchsafe) {
 278              // synchsafe ints are not allowed to be signed
 279              if ($bytewordlen <= PHP_INT_SIZE) {
 280                  $signMaskBit = 0x80 << (8 * ($bytewordlen - 1));
 281                  if ($intvalue & $signMaskBit) {
 282                      $intvalue = 0 - ($intvalue & ($signMaskBit - 1));
 283                  }
 284              } else {
 285                  throw new Exception('ERROR: Cannot have signed integers larger than '.(8 * PHP_INT_SIZE).'-bits ('.strlen($byteword).') in self::BigEndian2Int()');
 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')) {
 523              if (function_exists('get_object_vars')) {
 524                  if (function_exists('libxml_disable_entity_loader')) { // (PHP 5 >= 5.2.11)
 525                      // http://websec.io/2012/08/27/Preventing-XEE-in-PHP.html
 526                      libxml_disable_entity_loader(true);
 527                  }
 528                  $XMLobject = simplexml_load_string($XMLstring);
 529                  return self::SimpleXMLelement2array($XMLobject);
 530              }
 531          }
 532          return false;
 533      }
 534  
 535  	public static function SimpleXMLelement2array($XMLobject) {
 536          if (!is_object($XMLobject) && !is_array($XMLobject)) {
 537              return $XMLobject;
 538          }
 539          $XMLarray = (is_object($XMLobject) ? get_object_vars($XMLobject) : $XMLobject);
 540          foreach ($XMLarray as $key => $value) {
 541              $XMLarray[$key] = self::SimpleXMLelement2array($value);
 542          }
 543          return $XMLarray;
 544      }
 545  
 546  
 547      // Allan Hansen <ahØartemis*dk>
 548      // self::md5_data() - returns md5sum for a file from startuing position to absolute end position
 549  	public static function hash_data($file, $offset, $end, $algorithm) {
 550          static $tempdir = '';
 551          if (!self::intValueSupported($end)) {
 552              return false;
 553          }
 554          switch ($algorithm) {
 555              case 'md5':
 556                  $hash_function = 'md5_file';
 557                  $unix_call     = 'md5sum';
 558                  $windows_call  = 'md5sum.exe';
 559                  $hash_length   = 32;
 560                  break;
 561  
 562              case 'sha1':
 563                  $hash_function = 'sha1_file';
 564                  $unix_call     = 'sha1sum';
 565                  $windows_call  = 'sha1sum.exe';
 566                  $hash_length   = 40;
 567                  break;
 568  
 569              default:
 570                  throw new Exception('Invalid algorithm ('.$algorithm.') in self::hash_data()');
 571                  break;
 572          }
 573          $size = $end - $offset;
 574          while (true) {
 575              if (GETID3_OS_ISWINDOWS) {
 576  
 577                  // It seems that sha1sum.exe for Windows only works on physical files, does not accept piped data
 578                  // Fall back to create-temp-file method:
 579                  if ($algorithm == 'sha1') {
 580                      break;
 581                  }
 582  
 583                  $RequiredFiles = array('cygwin1.dll', 'head.exe', 'tail.exe', $windows_call);
 584                  foreach ($RequiredFiles as $required_file) {
 585                      if (!is_readable(GETID3_HELPERAPPSDIR.$required_file)) {
 586                          // helper apps not available - fall back to old method
 587                          break 2;
 588                      }
 589                  }
 590                  $commandline  = GETID3_HELPERAPPSDIR.'head.exe -c '.$end.' '.escapeshellarg(str_replace('/', DIRECTORY_SEPARATOR, $file)).' | ';
 591                  $commandline .= GETID3_HELPERAPPSDIR.'tail.exe -c '.$size.' | ';
 592                  $commandline .= GETID3_HELPERAPPSDIR.$windows_call;
 593  
 594              } else {
 595  
 596                  $commandline  = 'head -c'.$end.' '.escapeshellarg($file).' | ';
 597                  $commandline .= 'tail -c'.$size.' | ';
 598                  $commandline .= $unix_call;
 599  
 600              }
 601              if (preg_match('#(1|ON)#i', ini_get('safe_mode'))) {
 602                  //throw new Exception('PHP running in Safe Mode - backtick operator not available, using slower non-system-call '.$algorithm.' algorithm');
 603                  break;
 604              }
 605              return substr(`$commandline`, 0, $hash_length);
 606          }
 607  
 608          if (empty($tempdir)) {
 609              // yes this is ugly, feel free to suggest a better way
 610              require_once(dirname(__FILE__).'/getid3.php');
 611              $getid3_temp = new getID3();
 612              $tempdir = $getid3_temp->tempdir;
 613              unset($getid3_temp);
 614          }
 615          // try to create a temporary file in the system temp directory - invalid dirname should force to system temp dir
 616          if (($data_filename = tempnam($tempdir, 'gI3')) === false) {
 617              // can't find anywhere to create a temp file, just fail
 618              return false;
 619          }
 620  
 621          // Init
 622          $result = false;
 623  
 624          // copy parts of file
 625          try {
 626              self::CopyFileParts($file, $data_filename, $offset, $end - $offset);
 627              $result = $hash_function($data_filename);
 628          } catch (Exception $e) {
 629              throw new Exception('self::CopyFileParts() failed in getid_lib::hash_data(): '.$e->getMessage());
 630          }
 631          unlink($data_filename);
 632          return $result;
 633      }
 634  
 635  	public static function CopyFileParts($filename_source, $filename_dest, $offset, $length) {
 636          if (!self::intValueSupported($offset + $length)) {
 637              throw new Exception('cannot copy file portion, it extends beyond the '.round(PHP_INT_MAX / 1073741824).'GB limit');
 638          }
 639          if (is_readable($filename_source) && is_file($filename_source) && ($fp_src = fopen($filename_source, 'rb'))) {
 640              if (($fp_dest = fopen($filename_dest, 'wb'))) {
 641                  if (fseek($fp_src, $offset) == 0) {
 642                      $byteslefttowrite = $length;
 643                      while (($byteslefttowrite > 0) && ($buffer = fread($fp_src, min($byteslefttowrite, getID3::FREAD_BUFFER_SIZE)))) {
 644                          $byteswritten = fwrite($fp_dest, $buffer, $byteslefttowrite);
 645                          $byteslefttowrite -= $byteswritten;
 646                      }
 647                      return true;
 648                  } else {
 649                      throw new Exception('failed to seek to offset '.$offset.' in '.$filename_source);
 650                  }
 651                  fclose($fp_dest);
 652              } else {
 653                  throw new Exception('failed to create file for writing '.$filename_dest);
 654              }
 655              fclose($fp_src);
 656          } else {
 657              throw new Exception('failed to open file for reading '.$filename_source);
 658          }
 659          return false;
 660      }
 661  
 662  	public static function iconv_fallback_int_utf8($charval) {
 663          if ($charval < 128) {
 664              // 0bbbbbbb
 665              $newcharstring = chr($charval);
 666          } elseif ($charval < 2048) {
 667              // 110bbbbb 10bbbbbb
 668              $newcharstring  = chr(($charval >>   6) | 0xC0);
 669              $newcharstring .= chr(($charval & 0x3F) | 0x80);
 670          } elseif ($charval < 65536) {
 671              // 1110bbbb 10bbbbbb 10bbbbbb
 672              $newcharstring  = chr(($charval >>  12) | 0xE0);
 673              $newcharstring .= chr(($charval >>   6) | 0xC0);
 674              $newcharstring .= chr(($charval & 0x3F) | 0x80);
 675          } else {
 676              // 11110bbb 10bbbbbb 10bbbbbb 10bbbbbb
 677              $newcharstring  = chr(($charval >>  18) | 0xF0);
 678              $newcharstring .= chr(($charval >>  12) | 0xC0);
 679              $newcharstring .= chr(($charval >>   6) | 0xC0);
 680              $newcharstring .= chr(($charval & 0x3F) | 0x80);
 681          }
 682          return $newcharstring;
 683      }
 684  
 685      // ISO-8859-1 => UTF-8
 686  	public static function iconv_fallback_iso88591_utf8($string, $bom=false) {
 687          if (function_exists('utf8_encode')) {
 688              return utf8_encode($string);
 689          }
 690          // utf8_encode() unavailable, use getID3()'s iconv_fallback() conversions (possibly PHP is compiled without XML support)
 691          $newcharstring = '';
 692          if ($bom) {
 693              $newcharstring .= "\xEF\xBB\xBF";
 694          }
 695          for ($i = 0; $i < strlen($string); $i++) {
 696              $charval = ord($string{$i});
 697              $newcharstring .= self::iconv_fallback_int_utf8($charval);
 698          }
 699          return $newcharstring;
 700      }
 701  
 702      // ISO-8859-1 => UTF-16BE
 703  	public static function iconv_fallback_iso88591_utf16be($string, $bom=false) {
 704          $newcharstring = '';
 705          if ($bom) {
 706              $newcharstring .= "\xFE\xFF";
 707          }
 708          for ($i = 0; $i < strlen($string); $i++) {
 709              $newcharstring .= "\x00".$string{$i};
 710          }
 711          return $newcharstring;
 712      }
 713  
 714      // ISO-8859-1 => UTF-16LE
 715  	public static function iconv_fallback_iso88591_utf16le($string, $bom=false) {
 716          $newcharstring = '';
 717          if ($bom) {
 718              $newcharstring .= "\xFF\xFE";
 719          }
 720          for ($i = 0; $i < strlen($string); $i++) {
 721              $newcharstring .= $string{$i}."\x00";
 722          }
 723          return $newcharstring;
 724      }
 725  
 726      // ISO-8859-1 => UTF-16LE (BOM)
 727  	public static function iconv_fallback_iso88591_utf16($string) {
 728          return self::iconv_fallback_iso88591_utf16le($string, true);
 729      }
 730  
 731      // UTF-8 => ISO-8859-1
 732  	public static function iconv_fallback_utf8_iso88591($string) {
 733          if (function_exists('utf8_decode')) {
 734              return utf8_decode($string);
 735          }
 736          // utf8_decode() unavailable, use getID3()'s iconv_fallback() conversions (possibly PHP is compiled without XML support)
 737          $newcharstring = '';
 738          $offset = 0;
 739          $stringlength = strlen($string);
 740          while ($offset < $stringlength) {
 741              if ((ord($string{$offset}) | 0x07) == 0xF7) {
 742                  // 11110bbb 10bbbbbb 10bbbbbb 10bbbbbb
 743                  $charval = ((ord($string{($offset + 0)}) & 0x07) << 18) &
 744                             ((ord($string{($offset + 1)}) & 0x3F) << 12) &
 745                             ((ord($string{($offset + 2)}) & 0x3F) <<  6) &
 746                              (ord($string{($offset + 3)}) & 0x3F);
 747                  $offset += 4;
 748              } elseif ((ord($string{$offset}) | 0x0F) == 0xEF) {
 749                  // 1110bbbb 10bbbbbb 10bbbbbb
 750                  $charval = ((ord($string{($offset + 0)}) & 0x0F) << 12) &
 751                             ((ord($string{($offset + 1)}) & 0x3F) <<  6) &
 752                              (ord($string{($offset + 2)}) & 0x3F);
 753                  $offset += 3;
 754              } elseif ((ord($string{$offset}) | 0x1F) == 0xDF) {
 755                  // 110bbbbb 10bbbbbb
 756                  $charval = ((ord($string{($offset + 0)}) & 0x1F) <<  6) &
 757                              (ord($string{($offset + 1)}) & 0x3F);
 758                  $offset += 2;
 759              } elseif ((ord($string{$offset}) | 0x7F) == 0x7F) {
 760                  // 0bbbbbbb
 761                  $charval = ord($string{$offset});
 762                  $offset += 1;
 763              } else {
 764                  // error? throw some kind of warning here?
 765                  $charval = false;
 766                  $offset += 1;
 767              }
 768              if ($charval !== false) {
 769                  $newcharstring .= (($charval < 256) ? chr($charval) : '?');
 770              }
 771          }
 772          return $newcharstring;
 773      }
 774  
 775      // UTF-8 => UTF-16BE
 776  	public static function iconv_fallback_utf8_utf16be($string, $bom=false) {
 777          $newcharstring = '';
 778          if ($bom) {
 779              $newcharstring .= "\xFE\xFF";
 780          }
 781          $offset = 0;
 782          $stringlength = strlen($string);
 783          while ($offset < $stringlength) {
 784              if ((ord($string{$offset}) | 0x07) == 0xF7) {
 785                  // 11110bbb 10bbbbbb 10bbbbbb 10bbbbbb
 786                  $charval = ((ord($string{($offset + 0)}) & 0x07) << 18) &
 787                             ((ord($string{($offset + 1)}) & 0x3F) << 12) &
 788                             ((ord($string{($offset + 2)}) & 0x3F) <<  6) &
 789                              (ord($string{($offset + 3)}) & 0x3F);
 790                  $offset += 4;
 791              } elseif ((ord($string{$offset}) | 0x0F) == 0xEF) {
 792                  // 1110bbbb 10bbbbbb 10bbbbbb
 793                  $charval = ((ord($string{($offset + 0)}) & 0x0F) << 12) &
 794                             ((ord($string{($offset + 1)}) & 0x3F) <<  6) &
 795                              (ord($string{($offset + 2)}) & 0x3F);
 796                  $offset += 3;
 797              } elseif ((ord($string{$offset}) | 0x1F) == 0xDF) {
 798                  // 110bbbbb 10bbbbbb
 799                  $charval = ((ord($string{($offset + 0)}) & 0x1F) <<  6) &
 800                              (ord($string{($offset + 1)}) & 0x3F);
 801                  $offset += 2;
 802              } elseif ((ord($string{$offset}) | 0x7F) == 0x7F) {
 803                  // 0bbbbbbb
 804                  $charval = ord($string{$offset});
 805                  $offset += 1;
 806              } else {
 807                  // error? throw some kind of warning here?
 808                  $charval = false;
 809                  $offset += 1;
 810              }
 811              if ($charval !== false) {
 812                  $newcharstring .= (($charval < 65536) ? self::BigEndian2String($charval, 2) : "\x00".'?');
 813              }
 814          }
 815          return $newcharstring;
 816      }
 817  
 818      // UTF-8 => UTF-16LE
 819  	public static function iconv_fallback_utf8_utf16le($string, $bom=false) {
 820          $newcharstring = '';
 821          if ($bom) {
 822              $newcharstring .= "\xFF\xFE";
 823          }
 824          $offset = 0;
 825          $stringlength = strlen($string);
 826          while ($offset < $stringlength) {
 827              if ((ord($string{$offset}) | 0x07) == 0xF7) {
 828                  // 11110bbb 10bbbbbb 10bbbbbb 10bbbbbb
 829                  $charval = ((ord($string{($offset + 0)}) & 0x07) << 18) &
 830                             ((ord($string{($offset + 1)}) & 0x3F) << 12) &
 831                             ((ord($string{($offset + 2)}) & 0x3F) <<  6) &
 832                              (ord($string{($offset + 3)}) & 0x3F);
 833                  $offset += 4;
 834              } elseif ((ord($string{$offset}) | 0x0F) == 0xEF) {
 835                  // 1110bbbb 10bbbbbb 10bbbbbb
 836                  $charval = ((ord($string{($offset + 0)}) & 0x0F) << 12) &
 837                             ((ord($string{($offset + 1)}) & 0x3F) <<  6) &
 838                              (ord($string{($offset + 2)}) & 0x3F);
 839                  $offset += 3;
 840              } elseif ((ord($string{$offset}) | 0x1F) == 0xDF) {
 841                  // 110bbbbb 10bbbbbb
 842                  $charval = ((ord($string{($offset + 0)}) & 0x1F) <<  6) &
 843                              (ord($string{($offset + 1)}) & 0x3F);
 844                  $offset += 2;
 845              } elseif ((ord($string{$offset}) | 0x7F) == 0x7F) {
 846                  // 0bbbbbbb
 847                  $charval = ord($string{$offset});
 848                  $offset += 1;
 849              } else {
 850                  // error? maybe throw some warning here?
 851                  $charval = false;
 852                  $offset += 1;
 853              }
 854              if ($charval !== false) {
 855                  $newcharstring .= (($charval < 65536) ? self::LittleEndian2String($charval, 2) : '?'."\x00");
 856              }
 857          }
 858          return $newcharstring;
 859      }
 860  
 861      // UTF-8 => UTF-16LE (BOM)
 862  	public static function iconv_fallback_utf8_utf16($string) {
 863          return self::iconv_fallback_utf8_utf16le($string, true);
 864      }
 865  
 866      // UTF-16BE => UTF-8
 867  	public static function iconv_fallback_utf16be_utf8($string) {
 868          if (substr($string, 0, 2) == "\xFE\xFF") {
 869              // strip BOM
 870              $string = substr($string, 2);
 871          }
 872          $newcharstring = '';
 873          for ($i = 0; $i < strlen($string); $i += 2) {
 874              $charval = self::BigEndian2Int(substr($string, $i, 2));
 875              $newcharstring .= self::iconv_fallback_int_utf8($charval);
 876          }
 877          return $newcharstring;
 878      }
 879  
 880      // UTF-16LE => UTF-8
 881  	public static function iconv_fallback_utf16le_utf8($string) {
 882          if (substr($string, 0, 2) == "\xFF\xFE") {
 883              // strip BOM
 884              $string = substr($string, 2);
 885          }
 886          $newcharstring = '';
 887          for ($i = 0; $i < strlen($string); $i += 2) {
 888              $charval = self::LittleEndian2Int(substr($string, $i, 2));
 889              $newcharstring .= self::iconv_fallback_int_utf8($charval);
 890          }
 891          return $newcharstring;
 892      }
 893  
 894      // UTF-16BE => ISO-8859-1
 895  	public static function iconv_fallback_utf16be_iso88591($string) {
 896          if (substr($string, 0, 2) == "\xFE\xFF") {
 897              // strip BOM
 898              $string = substr($string, 2);
 899          }
 900          $newcharstring = '';
 901          for ($i = 0; $i < strlen($string); $i += 2) {
 902              $charval = self::BigEndian2Int(substr($string, $i, 2));
 903              $newcharstring .= (($charval < 256) ? chr($charval) : '?');
 904          }
 905          return $newcharstring;
 906      }
 907  
 908      // UTF-16LE => ISO-8859-1
 909  	public static function iconv_fallback_utf16le_iso88591($string) {
 910          if (substr($string, 0, 2) == "\xFF\xFE") {
 911              // strip BOM
 912              $string = substr($string, 2);
 913          }
 914          $newcharstring = '';
 915          for ($i = 0; $i < strlen($string); $i += 2) {
 916              $charval = self::LittleEndian2Int(substr($string, $i, 2));
 917              $newcharstring .= (($charval < 256) ? chr($charval) : '?');
 918          }
 919          return $newcharstring;
 920      }
 921  
 922      // UTF-16 (BOM) => ISO-8859-1
 923  	public static function iconv_fallback_utf16_iso88591($string) {
 924          $bom = substr($string, 0, 2);
 925          if ($bom == "\xFE\xFF") {
 926              return self::iconv_fallback_utf16be_iso88591(substr($string, 2));
 927          } elseif ($bom == "\xFF\xFE") {
 928              return self::iconv_fallback_utf16le_iso88591(substr($string, 2));
 929          }
 930          return $string;
 931      }
 932  
 933      // UTF-16 (BOM) => UTF-8
 934  	public static function iconv_fallback_utf16_utf8($string) {
 935          $bom = substr($string, 0, 2);
 936          if ($bom == "\xFE\xFF") {
 937              return self::iconv_fallback_utf16be_utf8(substr($string, 2));
 938          } elseif ($bom == "\xFF\xFE") {
 939              return self::iconv_fallback_utf16le_utf8(substr($string, 2));
 940          }
 941          return $string;
 942      }
 943  
 944  	public static function iconv_fallback($in_charset, $out_charset, $string) {
 945  
 946          if ($in_charset == $out_charset) {
 947              return $string;
 948          }
 949  
 950          // iconv() availble
 951          if (function_exists('iconv')) {
 952              if ($converted_string = @iconv($in_charset, $out_charset.'//TRANSLIT', $string)) {
 953                  switch ($out_charset) {
 954                      case 'ISO-8859-1':
 955                          $converted_string = rtrim($converted_string, "\x00");
 956                          break;
 957                  }
 958                  return $converted_string;
 959              }
 960  
 961              // iconv() may sometimes fail with "illegal character in input string" error message
 962              // and return an empty string, but returning the unconverted string is more useful
 963              return $string;
 964          }
 965  
 966  
 967          // iconv() not available
 968          static $ConversionFunctionList = array();
 969          if (empty($ConversionFunctionList)) {
 970              $ConversionFunctionList['ISO-8859-1']['UTF-8']    = 'iconv_fallback_iso88591_utf8';
 971              $ConversionFunctionList['ISO-8859-1']['UTF-16']   = 'iconv_fallback_iso88591_utf16';
 972              $ConversionFunctionList['ISO-8859-1']['UTF-16BE'] = 'iconv_fallback_iso88591_utf16be';
 973              $ConversionFunctionList['ISO-8859-1']['UTF-16LE'] = 'iconv_fallback_iso88591_utf16le';
 974              $ConversionFunctionList['UTF-8']['ISO-8859-1']    = 'iconv_fallback_utf8_iso88591';
 975              $ConversionFunctionList['UTF-8']['UTF-16']        = 'iconv_fallback_utf8_utf16';
 976              $ConversionFunctionList['UTF-8']['UTF-16BE']      = 'iconv_fallback_utf8_utf16be';
 977              $ConversionFunctionList['UTF-8']['UTF-16LE']      = 'iconv_fallback_utf8_utf16le';
 978              $ConversionFunctionList['UTF-16']['ISO-8859-1']   = 'iconv_fallback_utf16_iso88591';
 979              $ConversionFunctionList['UTF-16']['UTF-8']        = 'iconv_fallback_utf16_utf8';
 980              $ConversionFunctionList['UTF-16LE']['ISO-8859-1'] = 'iconv_fallback_utf16le_iso88591';
 981              $ConversionFunctionList['UTF-16LE']['UTF-8']      = 'iconv_fallback_utf16le_utf8';
 982              $ConversionFunctionList['UTF-16BE']['ISO-8859-1'] = 'iconv_fallback_utf16be_iso88591';
 983              $ConversionFunctionList['UTF-16BE']['UTF-8']      = 'iconv_fallback_utf16be_utf8';
 984          }
 985          if (isset($ConversionFunctionList[strtoupper($in_charset)][strtoupper($out_charset)])) {
 986              $ConversionFunction = $ConversionFunctionList[strtoupper($in_charset)][strtoupper($out_charset)];
 987              return self::$ConversionFunction($string);
 988          }
 989          throw new Exception('PHP does not have iconv() support - cannot convert from '.$in_charset.' to '.$out_charset);
 990      }
 991  
 992  	public static function recursiveMultiByteCharString2HTML($data, $charset='ISO-8859-1') {
 993          if (is_string($data)) {
 994              return self::MultiByteCharString2HTML($data, $charset);
 995          } elseif (is_array($data)) {
 996              $return_data = array();
 997              foreach ($data as $key => $value) {
 998                  $return_data[$key] = self::recursiveMultiByteCharString2HTML($value, $charset);
 999              }
1000              return $return_data;
1001          }
1002          // integer, float, objects, resources, etc
1003          return $data;
1004      }
1005  
1006  	public static function MultiByteCharString2HTML($string, $charset='ISO-8859-1') {
1007          $string = (string) $string; // in case trying to pass a numeric (float, int) string, would otherwise return an empty string
1008          $HTMLstring = '';
1009  
1010          switch ($charset) {
1011              case '1251':
1012              case '1252':
1013              case '866':
1014              case '932':
1015              case '936':
1016              case '950':
1017              case 'BIG5':
1018              case 'BIG5-HKSCS':
1019              case 'cp1251':
1020              case 'cp1252':
1021              case 'cp866':
1022              case 'EUC-JP':
1023              case 'EUCJP':
1024              case 'GB2312':
1025              case 'ibm866':
1026              case 'ISO-8859-1':
1027              case 'ISO-8859-15':
1028              case 'ISO8859-1':
1029              case 'ISO8859-15':
1030              case 'KOI8-R':
1031              case 'koi8-ru':
1032              case 'koi8r':
1033              case 'Shift_JIS':
1034              case 'SJIS':
1035              case 'win-1251':
1036              case 'Windows-1251':
1037              case 'Windows-1252':
1038                  $HTMLstring = htmlentities($string, ENT_COMPAT, $charset);
1039                  break;
1040  
1041              case 'UTF-8':
1042                  $strlen = strlen($string);
1043                  for ($i = 0; $i < $strlen; $i++) {
1044                      $char_ord_val = ord($string{$i});
1045                      $charval = 0;
1046                      if ($char_ord_val < 0x80) {
1047                          $charval = $char_ord_val;
1048                      } elseif ((($char_ord_val & 0xF0) >> 4) == 0x0F  &&  $i+3 < $strlen) {
1049                          $charval  = (($char_ord_val & 0x07) << 18);
1050                          $charval += ((ord($string{++$i}) & 0x3F) << 12);
1051                          $charval += ((ord($string{++$i}) & 0x3F) << 6);
1052                          $charval +=  (ord($string{++$i}) & 0x3F);
1053                      } elseif ((($char_ord_val & 0xE0) >> 5) == 0x07  &&  $i+2 < $strlen) {
1054                          $charval  = (($char_ord_val & 0x0F) << 12);
1055                          $charval += ((ord($string{++$i}) & 0x3F) << 6);
1056                          $charval +=  (ord($string{++$i}) & 0x3F);
1057                      } elseif ((($char_ord_val & 0xC0) >> 6) == 0x03  &&  $i+1 < $strlen) {
1058                          $charval  = (($char_ord_val & 0x1F) << 6);
1059                          $charval += (ord($string{++$i}) & 0x3F);
1060                      }
1061                      if (($charval >= 32) && ($charval <= 127)) {
1062                          $HTMLstring .= htmlentities(chr($charval));
1063                      } else {
1064                          $HTMLstring .= '&#'.$charval.';';
1065                      }
1066                  }
1067                  break;
1068  
1069              case 'UTF-16LE':
1070                  for ($i = 0; $i < strlen($string); $i += 2) {
1071                      $charval = self::LittleEndian2Int(substr($string, $i, 2));
1072                      if (($charval >= 32) && ($charval <= 127)) {
1073                          $HTMLstring .= chr($charval);
1074                      } else {
1075                          $HTMLstring .= '&#'.$charval.';';
1076                      }
1077                  }
1078                  break;
1079  
1080              case 'UTF-16BE':
1081                  for ($i = 0; $i < strlen($string); $i += 2) {
1082                      $charval = self::BigEndian2Int(substr($string, $i, 2));
1083                      if (($charval >= 32) && ($charval <= 127)) {
1084                          $HTMLstring .= chr($charval);
1085                      } else {
1086                          $HTMLstring .= '&#'.$charval.';';
1087                      }
1088                  }
1089                  break;
1090  
1091              default:
1092                  $HTMLstring = 'ERROR: Character set "'.$charset.'" not supported in MultiByteCharString2HTML()';
1093                  break;
1094          }
1095          return $HTMLstring;
1096      }
1097  
1098  
1099  
1100  	public static function RGADnameLookup($namecode) {
1101          static $RGADname = array();
1102          if (empty($RGADname)) {
1103              $RGADname[0] = 'not set';
1104              $RGADname[1] = 'Track Gain Adjustment';
1105              $RGADname[2] = 'Album Gain Adjustment';
1106          }
1107  
1108          return (isset($RGADname[$namecode]) ? $RGADname[$namecode] : '');
1109      }
1110  
1111  
1112  	public static function RGADoriginatorLookup($originatorcode) {
1113          static $RGADoriginator = array();
1114          if (empty($RGADoriginator)) {
1115              $RGADoriginator[0] = 'unspecified';
1116              $RGADoriginator[1] = 'pre-set by artist/producer/mastering engineer';
1117              $RGADoriginator[2] = 'set by user';
1118              $RGADoriginator[3] = 'determined automatically';
1119          }
1120  
1121          return (isset($RGADoriginator[$originatorcode]) ? $RGADoriginator[$originatorcode] : '');
1122      }
1123  
1124  
1125  	public static function RGADadjustmentLookup($rawadjustment, $signbit) {
1126          $adjustment = $rawadjustment / 10;
1127          if ($signbit == 1) {
1128              $adjustment *= -1;
1129          }
1130          return (float) $adjustment;
1131      }
1132  
1133  
1134  	public static function RGADgainString($namecode, $originatorcode, $replaygain) {
1135          if ($replaygain < 0) {
1136              $signbit = '1';
1137          } else {
1138              $signbit = '0';
1139          }
1140          $storedreplaygain = intval(round($replaygain * 10));
1141          $gainstring  = str_pad(decbin($namecode), 3, '0', STR_PAD_LEFT);
1142          $gainstring .= str_pad(decbin($originatorcode), 3, '0', STR_PAD_LEFT);
1143          $gainstring .= $signbit;
1144          $gainstring .= str_pad(decbin($storedreplaygain), 9, '0', STR_PAD_LEFT);
1145  
1146          return $gainstring;
1147      }
1148  
1149  	public static function RGADamplitude2dB($amplitude) {
1150          return 20 * log10($amplitude);
1151      }
1152  
1153  
1154  	public static function GetDataImageSize($imgData, &$imageinfo=array()) {
1155          static $tempdir = '';
1156          if (empty($tempdir)) {
1157              // yes this is ugly, feel free to suggest a better way
1158              require_once(dirname(__FILE__).'/getid3.php');
1159              $getid3_temp = new getID3();
1160              $tempdir = $getid3_temp->tempdir;
1161              unset($getid3_temp);
1162          }
1163          $GetDataImageSize = false;
1164          if ($tempfilename = tempnam($tempdir, 'gI3')) {
1165              if (is_writable($tempfilename) && is_file($tempfilename) && ($tmp = fopen($tempfilename, 'wb'))) {
1166                  fwrite($tmp, $imgData);
1167                  fclose($tmp);
1168                  $GetDataImageSize = @getimagesize($tempfilename, $imageinfo);
1169              }
1170              unlink($tempfilename);
1171          }
1172          return $GetDataImageSize;
1173      }
1174  
1175  	public static function ImageExtFromMime($mime_type) {
1176          // temporary way, works OK for now, but should be reworked in the future
1177          return str_replace(array('image/', 'x-', 'jpeg'), array('', '', 'jpg'), $mime_type);
1178      }
1179  
1180  	public static function ImageTypesLookup($imagetypeid) {
1181          static $ImageTypesLookup = array();
1182          if (empty($ImageTypesLookup)) {
1183              $ImageTypesLookup[1]  = 'gif';
1184              $ImageTypesLookup[2]  = 'jpeg';
1185              $ImageTypesLookup[3]  = 'png';
1186              $ImageTypesLookup[4]  = 'swf';
1187              $ImageTypesLookup[5]  = 'psd';
1188              $ImageTypesLookup[6]  = 'bmp';
1189              $ImageTypesLookup[7]  = 'tiff (little-endian)';
1190              $ImageTypesLookup[8]  = 'tiff (big-endian)';
1191              $ImageTypesLookup[9]  = 'jpc';
1192              $ImageTypesLookup[10] = 'jp2';
1193              $ImageTypesLookup[11] = 'jpx';
1194              $ImageTypesLookup[12] = 'jb2';
1195              $ImageTypesLookup[13] = 'swc';
1196              $ImageTypesLookup[14] = 'iff';
1197          }
1198          return (isset($ImageTypesLookup[$imagetypeid]) ? $ImageTypesLookup[$imagetypeid] : '');
1199      }
1200  
1201  	public static function CopyTagsToComments(&$ThisFileInfo) {
1202  
1203          // Copy all entries from ['tags'] into common ['comments']
1204          if (!empty($ThisFileInfo['tags'])) {
1205              foreach ($ThisFileInfo['tags'] as $tagtype => $tagarray) {
1206                  foreach ($tagarray as $tagname => $tagdata) {
1207                      foreach ($tagdata as $key => $value) {
1208                          if (!empty($value)) {
1209                              if (empty($ThisFileInfo['comments'][$tagname])) {
1210  
1211                                  // fall through and append value
1212  
1213                              } elseif ($tagtype == 'id3v1') {
1214  
1215                                  $newvaluelength = strlen(trim($value));
1216                                  foreach ($ThisFileInfo['comments'][$tagname] as $existingkey => $existingvalue) {
1217                                      $oldvaluelength = strlen(trim($existingvalue));
1218                                      if (($newvaluelength <= $oldvaluelength) && (substr($existingvalue, 0, $newvaluelength) == trim($value))) {
1219                                          // new value is identical but shorter-than (or equal-length to) one already in comments - skip
1220                                          break 2;
1221                                      }
1222                                  }
1223  
1224                              } elseif (!is_array($value)) {
1225  
1226                                  $newvaluelength = strlen(trim($value));
1227                                  foreach ($ThisFileInfo['comments'][$tagname] as $existingkey => $existingvalue) {
1228                                      $oldvaluelength = strlen(trim($existingvalue));
1229                                      if ((strlen($existingvalue) > 10) && ($newvaluelength > $oldvaluelength) && (substr(trim($value), 0, strlen($existingvalue)) == $existingvalue)) {
1230                                          $ThisFileInfo['comments'][$tagname][$existingkey] = trim($value);
1231                                          //break 2;
1232                                          break;
1233                                      }
1234                                  }
1235  
1236                              }
1237                              if (is_array($value) || empty($ThisFileInfo['comments'][$tagname]) || !in_array(trim($value), $ThisFileInfo['comments'][$tagname])) {
1238                                  $value = (is_string($value) ? trim($value) : $value);
1239                                  if (!is_numeric($key)) {
1240                                      $ThisFileInfo['comments'][$tagname][$key] = $value;
1241                                  } else {
1242                                      $ThisFileInfo['comments'][$tagname][]     = $value;
1243                                  }
1244                              }
1245                          }
1246                      }
1247                  }
1248              }
1249  
1250              // Copy to ['comments_html']
1251              if (!empty($ThisFileInfo['comments'])) {
1252                  foreach ($ThisFileInfo['comments'] as $field => $values) {
1253                      if ($field == 'picture') {
1254                          // pictures can take up a lot of space, and we don't need multiple copies of them
1255                          // let there be a single copy in [comments][picture], and not elsewhere
1256                          continue;
1257                      }
1258                      foreach ($values as $index => $value) {
1259                          if (is_array($value)) {
1260                              $ThisFileInfo['comments_html'][$field][$index] = $value;
1261                          } else {
1262                              $ThisFileInfo['comments_html'][$field][$index] = str_replace('&#0;', '', self::MultiByteCharString2HTML($value, $ThisFileInfo['encoding']));
1263                          }
1264                      }
1265                  }
1266              }
1267  
1268          }
1269          return true;
1270      }
1271  
1272  
1273  	public static function EmbeddedLookup($key, $begin, $end, $file, $name) {
1274  
1275          // Cached
1276          static $cache;
1277          if (isset($cache[$file][$name])) {
1278              return (isset($cache[$file][$name][$key]) ? $cache[$file][$name][$key] : '');
1279          }
1280  
1281          // Init
1282          $keylength  = strlen($key);
1283          $line_count = $end - $begin - 7;
1284  
1285          // Open php file
1286          $fp = fopen($file, 'r');
1287  
1288          // Discard $begin lines
1289          for ($i = 0; $i < ($begin + 3); $i++) {
1290              fgets($fp, 1024);
1291          }
1292  
1293          // Loop thru line
1294          while (0 < $line_count--) {
1295  
1296              // Read line
1297              $line = ltrim(fgets($fp, 1024), "\t ");
1298  
1299              // METHOD A: only cache the matching key - less memory but slower on next lookup of not-previously-looked-up key
1300              //$keycheck = substr($line, 0, $keylength);
1301              //if ($key == $keycheck)  {
1302              //    $cache[$file][$name][$keycheck] = substr($line, $keylength + 1);
1303              //    break;
1304              //}
1305  
1306              // METHOD B: cache all keys in this lookup - more memory but faster on next lookup of not-previously-looked-up key
1307              //$cache[$file][$name][substr($line, 0, $keylength)] = trim(substr($line, $keylength + 1));
1308              $explodedLine = explode("\t", $line, 2);
1309              $ThisKey   = (isset($explodedLine[0]) ? $explodedLine[0] : '');
1310              $ThisValue = (isset($explodedLine[1]) ? $explodedLine[1] : '');
1311              $cache[$file][$name][$ThisKey] = trim($ThisValue);
1312          }
1313  
1314          // Close and return
1315          fclose($fp);
1316          return (isset($cache[$file][$name][$key]) ? $cache[$file][$name][$key] : '');
1317      }
1318  
1319  	public static function IncludeDependency($filename, $sourcefile, $DieOnFailure=false) {
1320          global $GETID3_ERRORARRAY;
1321  
1322          if (file_exists($filename)) {
1323              if (include_once($filename)) {
1324                  return true;
1325              } else {
1326                  $diemessage = basename($sourcefile).' depends on '.$filename.', which has errors';
1327              }
1328          } else {
1329              $diemessage = basename($sourcefile).' depends on '.$filename.', which is missing';
1330          }
1331          if ($DieOnFailure) {
1332              throw new Exception($diemessage);
1333          } else {
1334              $GETID3_ERRORARRAY[] = $diemessage;
1335          }
1336          return false;
1337      }
1338  
1339  	public static function trimNullByte($string) {
1340          return trim($string, "\x00");
1341      }
1342  
1343  	public static function getFileSizeSyscall($path) {
1344          $filesize = false;
1345  
1346          if (GETID3_OS_ISWINDOWS) {
1347              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:
1348                  $filesystem = new COM('Scripting.FileSystemObject');
1349                  $file = $filesystem->GetFile($path);
1350                  $filesize = $file->Size();
1351                  unset($filesystem, $file);
1352              } else {
1353                  $commandline = 'for %I in ('.escapeshellarg($path).') do @echo %~zI';
1354              }
1355          } else {
1356              $commandline = 'ls -l '.escapeshellarg($path).' | awk \'{print $5}\'';
1357          }
1358          if (isset($commandline)) {
1359              $output = trim(`$commandline`);
1360              if (ctype_digit($output)) {
1361                  $filesize = (float) $output;
1362              }
1363          }
1364          return $filesize;
1365      }
1366  
1367  
1368      /**
1369      * Workaround for Bug #37268 (https://bugs.php.net/bug.php?id=37268)
1370      * @param string $path A path.
1371      * @param string $suffix If the name component ends in suffix this will also be cut off.
1372      * @return string
1373      */
1374  	public static function mb_basename($path, $suffix = null) {
1375          $splited = preg_split('#/#', rtrim($path, '/ '));
1376          return substr(basename('X'.$splited[count($splited) - 1], $suffix), 1);
1377      }
1378  
1379  }

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