PageRenderTime 510ms CodeModel.GetById 20ms app.highlight 126ms RepoModel.GetById 15ms app.codeStats 1ms

/wp-includes/ID3/getid3.lib.php

https://github.com/jezard/susiesummers
PHP | 1341 lines | 1070 code | 153 blank | 118 comment | 264 complexity | 9c4a8d5e262a1f8876bafdc364f907e2 MD5 | raw file
   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
  14class 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')) {
 523			if (function_exists('get_object_vars')) {
 524				$XMLobject = simplexml_load_string($XMLstring);
 525				return self::SimpleXMLelement2array($XMLobject);
 526			}
 527		}
 528		return false;
 529	}
 530
 531	public static function SimpleXMLelement2array($XMLobject) {
 532		if (!is_object($XMLobject) && !is_array($XMLobject)) {
 533			return $XMLobject;
 534		}
 535		$XMLarray = (is_object($XMLobject) ? get_object_vars($XMLobject) : $XMLobject);
 536		foreach ($XMLarray as $key => $value) {
 537			$XMLarray[$key] = self::SimpleXMLelement2array($value);
 538		}
 539		return $XMLarray;
 540	}
 541
 542
 543	// Allan Hansen <ahØartemis*dk>
 544	// self::md5_data() - returns md5sum for a file from startuing position to absolute end position
 545	public static function hash_data($file, $offset, $end, $algorithm) {
 546		static $tempdir = '';
 547		if (!self::intValueSupported($end)) {
 548			return false;
 549		}
 550		switch ($algorithm) {
 551			case 'md5':
 552				$hash_function = 'md5_file';
 553				$unix_call     = 'md5sum';
 554				$windows_call  = 'md5sum.exe';
 555				$hash_length   = 32;
 556				break;
 557
 558			case 'sha1':
 559				$hash_function = 'sha1_file';
 560				$unix_call     = 'sha1sum';
 561				$windows_call  = 'sha1sum.exe';
 562				$hash_length   = 40;
 563				break;
 564
 565			default:
 566				throw new Exception('Invalid algorithm ('.$algorithm.') in self::hash_data()');
 567				break;
 568		}
 569		$size = $end - $offset;
 570		while (true) {
 571			if (GETID3_OS_ISWINDOWS) {
 572
 573				// It seems that sha1sum.exe for Windows only works on physical files, does not accept piped data
 574				// Fall back to create-temp-file method:
 575				if ($algorithm == 'sha1') {
 576					break;
 577				}
 578
 579				$RequiredFiles = array('cygwin1.dll', 'head.exe', 'tail.exe', $windows_call);
 580				foreach ($RequiredFiles as $required_file) {
 581					if (!is_readable(GETID3_HELPERAPPSDIR.$required_file)) {
 582						// helper apps not available - fall back to old method
 583						break 2;
 584					}
 585				}
 586				$commandline  = GETID3_HELPERAPPSDIR.'head.exe -c '.$end.' '.escapeshellarg(str_replace('/', DIRECTORY_SEPARATOR, $file)).' | ';
 587				$commandline .= GETID3_HELPERAPPSDIR.'tail.exe -c '.$size.' | ';
 588				$commandline .= GETID3_HELPERAPPSDIR.$windows_call;
 589
 590			} else {
 591
 592				$commandline  = 'head -c'.$end.' '.escapeshellarg($file).' | ';
 593				$commandline .= 'tail -c'.$size.' | ';
 594				$commandline .= $unix_call;
 595
 596			}
 597			if (preg_match('#(1|ON)#i', ini_get('safe_mode'))) {
 598				//throw new Exception('PHP running in Safe Mode - backtick operator not available, using slower non-system-call '.$algorithm.' algorithm');
 599				break;
 600			}
 601			return substr(`$commandline`, 0, $hash_length);
 602		}
 603
 604		if (empty($tempdir)) {
 605			// yes this is ugly, feel free to suggest a better way
 606			require_once(dirname(__FILE__).'/getid3.php');
 607			$getid3_temp = new getID3();
 608			$tempdir = $getid3_temp->tempdir;
 609			unset($getid3_temp);
 610		}
 611		// try to create a temporary file in the system temp directory - invalid dirname should force to system temp dir
 612		if (($data_filename = tempnam($tempdir, 'gI3')) === false) {
 613			// can't find anywhere to create a temp file, just fail
 614			return false;
 615		}
 616
 617		// Init
 618		$result = false;
 619
 620		// copy parts of file
 621		try {
 622			self::CopyFileParts($file, $data_filename, $offset, $end - $offset);
 623			$result = $hash_function($data_filename);
 624		} catch (Exception $e) {
 625			throw new Exception('self::CopyFileParts() failed in getid_lib::hash_data(): '.$e->getMessage());
 626		}
 627		unlink($data_filename);
 628		return $result;
 629	}
 630
 631	public static function CopyFileParts($filename_source, $filename_dest, $offset, $length) {
 632		if (!self::intValueSupported($offset + $length)) {
 633			throw new Exception('cannot copy file portion, it extends beyond the '.round(PHP_INT_MAX / 1073741824).'GB limit');
 634		}
 635		if (is_readable($filename_source) && is_file($filename_source) && ($fp_src = fopen($filename_source, 'rb'))) {
 636			if (($fp_dest = fopen($filename_dest, 'wb'))) {
 637				if (fseek($fp_src, $offset, SEEK_SET) == 0) {
 638					$byteslefttowrite = $length;
 639					while (($byteslefttowrite > 0) && ($buffer = fread($fp_src, min($byteslefttowrite, getID3::FREAD_BUFFER_SIZE)))) {
 640						$byteswritten = fwrite($fp_dest, $buffer, $byteslefttowrite);
 641						$byteslefttowrite -= $byteswritten;
 642					}
 643					return true;
 644				} else {
 645					throw new Exception('failed to seek to offset '.$offset.' in '.$filename_source);
 646				}
 647				fclose($fp_dest);
 648			} else {
 649				throw new Exception('failed to create file for writing '.$filename_dest);
 650			}
 651			fclose($fp_src);
 652		} else {
 653			throw new Exception('failed to open file for reading '.$filename_source);
 654		}
 655		return false;
 656	}
 657
 658	public static function iconv_fallback_int_utf8($charval) {
 659		if ($charval < 128) {
 660			// 0bbbbbbb
 661			$newcharstring = chr($charval);
 662		} elseif ($charval < 2048) {
 663			// 110bbbbb 10bbbbbb
 664			$newcharstring  = chr(($charval >>   6) | 0xC0);
 665			$newcharstring .= chr(($charval & 0x3F) | 0x80);
 666		} elseif ($charval < 65536) {
 667			// 1110bbbb 10bbbbbb 10bbbbbb
 668			$newcharstring  = chr(($charval >>  12) | 0xE0);
 669			$newcharstring .= chr(($charval >>   6) | 0xC0);
 670			$newcharstring .= chr(($charval & 0x3F) | 0x80);
 671		} else {
 672			// 11110bbb 10bbbbbb 10bbbbbb 10bbbbbb
 673			$newcharstring  = chr(($charval >>  18) | 0xF0);
 674			$newcharstring .= chr(($charval >>  12) | 0xC0);
 675			$newcharstring .= chr(($charval >>   6) | 0xC0);
 676			$newcharstring .= chr(($charval & 0x3F) | 0x80);
 677		}
 678		return $newcharstring;
 679	}
 680
 681	// ISO-8859-1 => UTF-8
 682	public static function iconv_fallback_iso88591_utf8($string, $bom=false) {
 683		if (function_exists('utf8_encode')) {
 684			return utf8_encode($string);
 685		}
 686		// utf8_encode() unavailable, use getID3()'s iconv_fallback() conversions (possibly PHP is compiled without XML support)
 687		$newcharstring = '';
 688		if ($bom) {
 689			$newcharstring .= "\xEF\xBB\xBF";
 690		}
 691		for ($i = 0; $i < strlen($string); $i++) {
 692			$charval = ord($string{$i});
 693			$newcharstring .= self::iconv_fallback_int_utf8($charval);
 694		}
 695		return $newcharstring;
 696	}
 697
 698	// ISO-8859-1 => UTF-16BE
 699	public static function iconv_fallback_iso88591_utf16be($string, $bom=false) {
 700		$newcharstring = '';
 701		if ($bom) {
 702			$newcharstring .= "\xFE\xFF";
 703		}
 704		for ($i = 0; $i < strlen($string); $i++) {
 705			$newcharstring .= "\x00".$string{$i};
 706		}
 707		return $newcharstring;
 708	}
 709
 710	// ISO-8859-1 => UTF-16LE
 711	public static function iconv_fallback_iso88591_utf16le($string, $bom=false) {
 712		$newcharstring = '';
 713		if ($bom) {
 714			$newcharstring .= "\xFF\xFE";
 715		}
 716		for ($i = 0; $i < strlen($string); $i++) {
 717			$newcharstring .= $string{$i}."\x00";
 718		}
 719		return $newcharstring;
 720	}
 721
 722	// ISO-8859-1 => UTF-16LE (BOM)
 723	public static function iconv_fallback_iso88591_utf16($string) {
 724		return self::iconv_fallback_iso88591_utf16le($string, true);
 725	}
 726
 727	// UTF-8 => ISO-8859-1
 728	public static function iconv_fallback_utf8_iso88591($string) {
 729		if (function_exists('utf8_decode')) {
 730			return utf8_decode($string);
 731		}
 732		// utf8_decode() unavailable, use getID3()'s iconv_fallback() conversions (possibly PHP is compiled without XML support)
 733		$newcharstring = '';
 734		$offset = 0;
 735		$stringlength = strlen($string);
 736		while ($offset < $stringlength) {
 737			if ((ord($string{$offset}) | 0x07) == 0xF7) {
 738				// 11110bbb 10bbbbbb 10bbbbbb 10bbbbbb
 739				$charval = ((ord($string{($offset + 0)}) & 0x07) << 18) &
 740						   ((ord($string{($offset + 1)}) & 0x3F) << 12) &
 741						   ((ord($string{($offset + 2)}) & 0x3F) <<  6) &
 742							(ord($string{($offset + 3)}) & 0x3F);
 743				$offset += 4;
 744			} elseif ((ord($string{$offset}) | 0x0F) == 0xEF) {
 745				// 1110bbbb 10bbbbbb 10bbbbbb
 746				$charval = ((ord($string{($offset + 0)}) & 0x0F) << 12) &
 747						   ((ord($string{($offset + 1)}) & 0x3F) <<  6) &
 748							(ord($string{($offset + 2)}) & 0x3F);
 749				$offset += 3;
 750			} elseif ((ord($string{$offset}) | 0x1F) == 0xDF) {
 751				// 110bbbbb 10bbbbbb
 752				$charval = ((ord($string{($offset + 0)}) & 0x1F) <<  6) &
 753							(ord($string{($offset + 1)}) & 0x3F);
 754				$offset += 2;
 755			} elseif ((ord($string{$offset}) | 0x7F) == 0x7F) {
 756				// 0bbbbbbb
 757				$charval = ord($string{$offset});
 758				$offset += 1;
 759			} else {
 760				// error? throw some kind of warning here?
 761				$charval = false;
 762				$offset += 1;
 763			}
 764			if ($charval !== false) {
 765				$newcharstring .= (($charval < 256) ? chr($charval) : '?');
 766			}
 767		}
 768		return $newcharstring;
 769	}
 770
 771	// UTF-8 => UTF-16BE
 772	public static function iconv_fallback_utf8_utf16be($string, $bom=false) {
 773		$newcharstring = '';
 774		if ($bom) {
 775			$newcharstring .= "\xFE\xFF";
 776		}
 777		$offset = 0;
 778		$stringlength = strlen($string);
 779		while ($offset < $stringlength) {
 780			if ((ord($string{$offset}) | 0x07) == 0xF7) {
 781				// 11110bbb 10bbbbbb 10bbbbbb 10bbbbbb
 782				$charval = ((ord($string{($offset + 0)}) & 0x07) << 18) &
 783						   ((ord($string{($offset + 1)}) & 0x3F) << 12) &
 784						   ((ord($string{($offset + 2)}) & 0x3F) <<  6) &
 785							(ord($string{($offset + 3)}) & 0x3F);
 786				$offset += 4;
 787			} elseif ((ord($string{$offset}) | 0x0F) == 0xEF) {
 788				// 1110bbbb 10bbbbbb 10bbbbbb
 789				$charval = ((ord($string{($offset + 0)}) & 0x0F) << 12) &
 790						   ((ord($string{($offset + 1)}) & 0x3F) <<  6) &
 791							(ord($string{($offset + 2)}) & 0x3F);
 792				$offset += 3;
 793			} elseif ((ord($string{$offset}) | 0x1F) == 0xDF) {
 794				// 110bbbbb 10bbbbbb
 795				$charval = ((ord($string{($offset + 0)}) & 0x1F) <<  6) &
 796							(ord($string{($offset + 1)}) & 0x3F);
 797				$offset += 2;
 798			} elseif ((ord($string{$offset}) | 0x7F) == 0x7F) {
 799				// 0bbbbbbb
 800				$charval = ord($string{$offset});
 801				$offset += 1;
 802			} else {
 803				// error? throw some kind of warning here?
 804				$charval = false;
 805				$offset += 1;
 806			}
 807			if ($charval !== false) {
 808				$newcharstring .= (($charval < 65536) ? self::BigEndian2String($charval, 2) : "\x00".'?');
 809			}
 810		}
 811		return $newcharstring;
 812	}
 813
 814	// UTF-8 => UTF-16LE
 815	public static function iconv_fallback_utf8_utf16le($string, $bom=false) {
 816		$newcharstring = '';
 817		if ($bom) {
 818			$newcharstring .= "\xFF\xFE";
 819		}
 820		$offset = 0;
 821		$stringlength = strlen($string);
 822		while ($offset < $stringlength) {
 823			if ((ord($string{$offset}) | 0x07) == 0xF7) {
 824				// 11110bbb 10bbbbbb 10bbbbbb 10bbbbbb
 825				$charval = ((ord($string{($offset + 0)}) & 0x07) << 18) &
 826						   ((ord($string{($offset + 1)}) & 0x3F) << 12) &
 827						   ((ord($string{($offset + 2)}) & 0x3F) <<  6) &
 828							(ord($string{($offset + 3)}) & 0x3F);
 829				$offset += 4;
 830			} elseif ((ord($string{$offset}) | 0x0F) == 0xEF) {
 831				// 1110bbbb 10bbbbbb 10bbbbbb
 832				$charval = ((ord($string{($offset + 0)}) & 0x0F) << 12) &
 833						   ((ord($string{($offset + 1)}) & 0x3F) <<  6) &
 834							(ord($string{($offset + 2)}) & 0x3F);
 835				$offset += 3;
 836			} elseif ((ord($string{$offset}) | 0x1F) == 0xDF) {
 837				// 110bbbbb 10bbbbbb
 838				$charval = ((ord($string{($offset + 0)}) & 0x1F) <<  6) &
 839							(ord($string{($offset + 1)}) & 0x3F);
 840				$offset += 2;
 841			} elseif ((ord($string{$offset}) | 0x7F) == 0x7F) {
 842				// 0bbbbbbb
 843				$charval = ord($string{$offset});
 844				$offset += 1;
 845			} else {
 846				// error? maybe throw some warning here?
 847				$charval = false;
 848				$offset += 1;
 849			}
 850			if ($charval !== false) {
 851				$newcharstring .= (($charval < 65536) ? self::LittleEndian2String($charval, 2) : '?'."\x00");
 852			}
 853		}
 854		return $newcharstring;
 855	}
 856
 857	// UTF-8 => UTF-16LE (BOM)
 858	public static function iconv_fallback_utf8_utf16($string) {
 859		return self::iconv_fallback_utf8_utf16le($string, true);
 860	}
 861
 862	// UTF-16BE => UTF-8
 863	public static function iconv_fallback_utf16be_utf8($string) {
 864		if (substr($string, 0, 2) == "\xFE\xFF") {
 865			// strip BOM
 866			$string = substr($string, 2);
 867		}
 868		$newcharstring = '';
 869		for ($i = 0; $i < strlen($string); $i += 2) {
 870			$charval = self::BigEndian2Int(substr($string, $i, 2));
 871			$newcharstring .= self::iconv_fallback_int_utf8($charval);
 872		}
 873		return $newcharstring;
 874	}
 875
 876	// UTF-16LE => UTF-8
 877	public static function iconv_fallback_utf16le_utf8($string) {
 878		if (substr($string, 0, 2) == "\xFF\xFE") {
 879			// strip BOM
 880			$string = substr($string, 2);
 881		}
 882		$newcharstring = '';
 883		for ($i = 0; $i < strlen($string); $i += 2) {
 884			$charval = self::LittleEndian2Int(substr($string, $i, 2));
 885			$newcharstring .= self::iconv_fallback_int_utf8($charval);
 886		}
 887		return $newcharstring;
 888	}
 889
 890	// UTF-16BE => ISO-8859-1
 891	public static function iconv_fallback_utf16be_iso88591($string) {
 892		if (substr($string, 0, 2) == "\xFE\xFF") {
 893			// strip BOM
 894			$string = substr($string, 2);
 895		}
 896		$newcharstring = '';
 897		for ($i = 0; $i < strlen($string); $i += 2) {
 898			$charval = self::BigEndian2Int(substr($string, $i, 2));
 899			$newcharstring .= (($charval < 256) ? chr($charval) : '?');
 900		}
 901		return $newcharstring;
 902	}
 903
 904	// UTF-16LE => ISO-8859-1
 905	public static function iconv_fallback_utf16le_iso88591($string) {
 906		if (substr($string, 0, 2) == "\xFF\xFE") {
 907			// strip BOM
 908			$string = substr($string, 2);
 909		}
 910		$newcharstring = '';
 911		for ($i = 0; $i < strlen($string); $i += 2) {
 912			$charval = self::LittleEndian2Int(substr($string, $i, 2));
 913			$newcharstring .= (($charval < 256) ? chr($charval) : '?');
 914		}
 915		return $newcharstring;
 916	}
 917
 918	// UTF-16 (BOM) => ISO-8859-1
 919	public static function iconv_fallback_utf16_iso88591($string) {
 920		$bom = substr($string, 0, 2);
 921		if ($bom == "\xFE\xFF") {
 922			return self::iconv_fallback_utf16be_iso88591(substr($string, 2));
 923		} elseif ($bom == "\xFF\xFE") {
 924			return self::iconv_fallback_utf16le_iso88591(substr($string, 2));
 925		}
 926		return $string;
 927	}
 928
 929	// UTF-16 (BOM) => UTF-8
 930	public static function iconv_fallback_utf16_utf8($string) {
 931		$bom = substr($string, 0, 2);
 932		if ($bom == "\xFE\xFF") {
 933			return self::iconv_fallback_utf16be_utf8(substr($string, 2));
 934		} elseif ($bom == "\xFF\xFE") {
 935			return self::iconv_fallback_utf16le_utf8(substr($string, 2));
 936		}
 937		return $string;
 938	}
 939
 940	public static function iconv_fallback($in_charset, $out_charset, $string) {
 941
 942		if ($in_charset == $out_charset) {
 943			return $string;
 944		}
 945
 946		// iconv() availble
 947		if (function_exists('iconv')) {
 948			if ($converted_string = @iconv($in_charset, $out_charset.'//TRANSLIT', $string)) {
 949				switch ($out_charset) {
 950					case 'ISO-8859-1':
 951						$converted_string = rtrim($converted_string, "\x00");
 952						break;
 953				}
 954				return $converted_string;
 955			}
 956
 957			// iconv() may sometimes fail with "illegal character in input string" error message
 958			// and return an empty string, but returning the unconverted string is more useful
 959			return $string;
 960		}
 961
 962
 963		// iconv() not available
 964		static $ConversionFunctionList = array();
 965		if (empty($ConversionFunctionList)) {
 966			$ConversionFunctionList['ISO-8859-1']['UTF-8']    = 'iconv_fallback_iso88591_utf8';
 967			$ConversionFunctionList['ISO-8859-1']['UTF-16']   = 'iconv_fallback_iso88591_utf16';
 968			$ConversionFunctionList['ISO-8859-1']['UTF-16BE'] = 'iconv_fallback_iso88591_utf16be';
 969			$ConversionFunctionList['ISO-8859-1']['UTF-16LE'] = 'iconv_fallback_iso88591_utf16le';
 970			$ConversionFunctionList['UTF-8']['ISO-8859-1']    = 'iconv_fallback_utf8_iso88591';
 971			$ConversionFunctionList['UTF-8']['UTF-16']        = 'iconv_fallback_utf8_utf16';
 972			$ConversionFunctionList['UTF-8']['UTF-16BE']      = 'iconv_fallback_utf8_utf16be';
 973			$ConversionFunctionList['UTF-8']['UTF-16LE']      = 'iconv_fallback_utf8_utf16le';
 974			$ConversionFunctionList['UTF-16']['ISO-8859-1']   = 'iconv_fallback_utf16_iso88591';
 975			$ConversionFunctionList['UTF-16']['UTF-8']        = 'iconv_fallback_utf16_utf8';
 976			$ConversionFunctionList['UTF-16LE']['ISO-8859-1'] = 'iconv_fallback_utf16le_iso88591';
 977			$ConversionFunctionList['UTF-16LE']['UTF-8']      = 'iconv_fallback_utf16le_utf8';
 978			$ConversionFunctionList['UTF-16BE']['ISO-8859-1'] = 'iconv_fallback_utf16be_iso88591';
 979			$ConversionFunctionList['UTF-16BE']['UTF-8']      = 'iconv_fallback_utf16be_utf8';
 980		}
 981		if (isset($ConversionFunctionList[strtoupper($in_charset)][strtoupper($out_charset)])) {
 982			$ConversionFunction = $ConversionFunctionList[strtoupper($in_charset)][strtoupper($out_charset)];
 983			return self::$ConversionFunction($string);
 984		}
 985		throw new Exception('PHP does not have iconv() support - cannot convert from '.$in_charset.' to '.$out_charset);
 986	}
 987
 988
 989	public static function MultiByteCharString2HTML($string, $charset='ISO-8859-1') {
 990		$string = (string) $string; // in case trying to pass a numeric (float, int) string, would otherwise return an empty string
 991		$HTMLstring = '';
 992
 993		switch ($charset) {
 994			case '1251':
 995			case '1252':
 996			case '866':
 997			case '932':
 998			case '936':
 999			case '950':
1000			case 'BIG5':
1001			case 'BIG5-HKSCS':
1002			case 'cp1251':
1003			case 'cp1252':
1004			case 'cp866':
1005			case 'EUC-JP':
1006			case 'EUCJP':
1007			case 'GB2312':
1008			case 'ibm866':
1009			case 'ISO-8859-1':
1010			case 'ISO-8859-15':
1011			case 'ISO8859-1':
1012			case 'ISO8859-15':
1013			case 'KOI8-R':
1014			case 'koi8-ru':
1015			case 'koi8r':
1016			case 'Shift_JIS':
1017			case 'SJIS':
1018			case 'win-1251':
1019			case 'Windows-1251':
1020			case 'Windows-1252':
1021				$HTMLstring = htmlentities($string, ENT_COMPAT, $charset);
1022				break;
1023
1024			case 'UTF-8':
1025				$strlen = strlen($string);
1026				for ($i = 0; $i < $strlen; $i++) {
1027					$char_ord_val = ord($string{$i});
1028					$charval = 0;
1029					if ($char_ord_val < 0x80) {
1030						$charval = $char_ord_val;
1031					} elseif ((($char_ord_val & 0xF0) >> 4) == 0x0F  &&  $i+3 < $strlen) {
1032						$charval  = (($char_ord_val & 0x07) << 18);
1033						$charval += ((ord($string{++$i}) & 0x3F) << 12);
1034						$charval += ((ord($string{++$i}) & 0x3F) << 6);
1035						$charval +=  (ord($string{++$i}) & 0x3F);
1036					} elseif ((($char_ord_val & 0xE0) >> 5) == 0x07  &&  $i+2 < $strlen) {
1037						$charval  = (($char_ord_val & 0x0F) << 12);
1038						$charval += ((ord($string{++$i}) & 0x3F) << 6);
1039						$charval +=  (ord($string{++$i}) & 0x3F);
1040					} elseif ((($char_ord_val & 0xC0) >> 6) == 0x03  &&  $i+1 < $strlen) {
1041						$charval  = (($char_ord_val & 0x1F) << 6);
1042						$charval += (ord($string{++$i}) & 0x3F);
1043					}
1044					if (($charval >= 32) && ($charval <= 127)) {
1045						$HTMLstring .= htmlentities(chr($charval));
1046					} else {
1047						$HTMLstring .= '&#'.$charval.';';
1048					}
1049				}
1050				break;
1051
1052			case 'UTF-16LE':
1053				for ($i = 0; $i < strlen($string); $i += 2) {
1054					$charval = self::LittleEndian2Int(substr($string, $i, 2));
1055					if (($charval >= 32) && ($charval <= 127)) {
1056						$HTMLstring .= chr($charval);
1057					} else {
1058						$HTMLstring .= '&#'.$charval.';';
1059					}
1060				}
1061				break;
1062
1063			case 'UTF-16BE':
1064				for ($i = 0; $i < strlen($string); $i += 2) {
1065					$charval = self::BigEndian2Int(substr($string, $i, 2));
1066					if (($charval >= 32) && ($charval <= 127)) {
1067						$HTMLstring .= chr($charval);
1068					} else {
1069						$HTMLstring .= '&#'.$charval.';';
1070					}
1071				}
1072				break;
1073
1074			default:
1075				$HTMLstring = 'ERROR: Character set "'.$charset.'" not supported in MultiByteCharString2HTML()';
1076				break;
1077		}
1078		return $HTMLstring;
1079	}
1080
1081
1082
1083	public static function RGADnameLookup($namecode) {
1084		static $RGADname = array();
1085		if (empty($RGADname)) {
1086			$RGADname[0] = 'not set';
1087			$RGADname[1] = 'Track Gain Adjustment';
1088			$RGADname[2] = 'Album Gain Adjustment';
1089		}
1090
1091		return (isset($RGADname[$namecode]) ? $RGADname[$namecode] : '');
1092	}
1093
1094
1095	public static function RGADoriginatorLookup($originatorcode) {
1096		static $RGADoriginator = array();
1097		if (empty($RGADoriginator)) {
1098			$RGADoriginator[0] = 'unspecified';
1099			$RGADoriginator[1] = 'pre-set by artist/producer/mastering engineer';
1100			$RGADoriginator[2] = 'set by user';
1101			$RGADoriginator[3] = 'determined automatically';
1102		}
1103
1104		return (isset($RGADoriginator[$originatorcode]) ? $RGADoriginator[$originatorcode] : '');
1105	}
1106
1107
1108	public static function RGADadjustmentLookup($rawadjustment, $signbit) {
1109		$adjustment = $rawadjustment / 10;
1110		if ($signbit == 1) {
1111			$adjustment *= -1;
1112		}
1113		return (float) $adjustment;
1114	}
1115
1116
1117	public static function RGADgainString($namecode, $originatorcode, $replaygain) {
1118		if ($replaygain < 0) {
1119			$signbit = '1';
1120		} else {
1121			$signbit = '0';
1122		}
1123		$storedreplaygain = intval(round($replaygain * 10));
1124		$gainstring  = str_pad(decbin($namecode), 3, '0', STR_PAD_LEFT);
1125		$gainstring .= str_pad(decbin($originatorcode), 3, '0', STR_PAD_LEFT);
1126		$gainstring .= $signbit;
1127		$gainstring .= str_pad(decbin($storedreplaygain), 9, '0', STR_PAD_LEFT);
1128
1129		return $gainstring;
1130	}
1131
1132	public static function RGADamplitude2dB($amplitude) {
1133		return 20 * log10($amplitude);
1134	}
1135
1136
1137	public static function GetDataImageSize($imgData, &$imageinfo=array()) {
1138		static $tempdir = '';
1139		if (empty($tempdir)) {
1140			// yes this is ugly, feel free to suggest a better way
1141			require_once(dirname(__FILE__).'/getid3.php');
1142			$getid3_temp = new getID3();
1143			$tempdir = $getid3_temp->tempdir;
1144			unset($getid3_temp);
1145		}
1146		$GetDataImageSize = false;
1147		if ($tempfilename = tempnam($tempdir, 'gI3')) {
1148			if (is_writable($tempfilename) && is_file($tempfilename) && ($tmp = fopen($tempfilename, 'wb'))) {
1149				fwrite($tmp, $imgData);
1150				fclose($tmp);
1151				$GetDataImageSize = @getimagesize($tempfilename, $imageinfo);
1152			}
1153			unlink($tempfilename);
1154		}
1155		return $GetDataImageSize;
1156	}
1157
1158	public static function ImageExtFromMime($mime_type) {
1159		// temporary way, works OK for now, but should be reworked in the future
1160		return str_replace(array('image/', 'x-', 'jpeg'), array('', '', 'jpg'), $mime_type);
1161	}
1162
1163	public static function ImageTypesLookup($imagetypeid) {
1164		static $ImageTypesLookup = array();
1165		if (empty($ImageTypesLookup)) {
1166			$ImageTypesLookup[1]  = 'gif';
1167			$ImageTypesLookup[2]  = 'jpeg';
1168			$ImageTypesLookup[3]  = 'png';
1169			$ImageTypesLookup[4]  = 'swf';
1170			$ImageTypesLookup[5]  = 'psd';
1171			$ImageTypesLookup[6]  = 'bmp';
1172			$ImageTypesLookup[7]  = 'tiff (little-endian)';
1173			$ImageTypesLookup[8]  = 'tiff (big-endian)';
1174			$ImageTypesLookup[9]  = 'jpc';
1175			$ImageTypesLookup[10] = 'jp2';
1176			$ImageTypesLookup[11] = 'jpx';
1177			$ImageTypesLookup[12] = 'jb2';
1178			$ImageTypesLookup[13] = 'swc';
1179			$ImageTypesLookup[14] = 'iff';
1180		}
1181		return (isset($ImageTypesLookup[$imagetypeid]) ? $ImageTypesLookup[$imagetypeid] : '');
1182	}
1183
1184	public static function CopyTagsToComments(&$ThisFileInfo) {
1185
1186		// Copy all entries from ['tags'] into common ['comments']
1187		if (!empty($ThisFileInfo['tags'])) {
1188			foreach ($ThisFileInfo['tags'] as $tagtype => $tagarray) {
1189				foreach ($tagarray as $tagname => $tagdata) {
1190					foreach ($tagdata as $key => $value) {
1191						if (!empty($value)) {
1192							if (empty($ThisFileInfo['comments'][$tagname])) {
1193
1194								// fall through and append value
1195
1196							} elseif ($tagtype == 'id3v1') {
1197
1198								$newvaluelength = strlen(trim($value));
1199								foreach ($ThisFileInfo['comments'][$tagname] as $existingkey => $existingvalue) {
1200									$oldvaluelength = strlen(trim($existingvalue));
1201									if (($newvaluelength <= $oldvaluelength) && (substr($existingvalue, 0, $newvaluelength) == trim($value))) {
1202										// new value is identical but shorter-than (or equal-length to) one already in comments - skip
1203										break 2;
1204									}
1205								}
1206
1207							} elseif (!is_array($value)) {
1208
1209								$newvaluelength = strlen(trim($value));
1210								foreach ($ThisFileInfo['comments'][$tagname] as $existingkey => $existingvalue) {
1211									$oldvaluelength = strlen(trim($existingvalue));
1212									if (($newvaluelength > $oldvaluelength) && (substr(trim($value), 0, strlen($existingvalue)) == $existingvalue)) {
1213										$ThisFileInfo['comments'][$tagname][$existingkey] = trim($value);
1214										break 2;
1215									}
1216								}
1217
1218							}
1219							if (is_array($value) || empty($ThisFileInfo['comments'][$tagname]) || !in_array(trim($value), $ThisFileInfo['comments'][$tagname])) {
1220								$value = (is_string($value) ? trim($value) : $value);
1221								$ThisFileInfo['comments'][$tagname][] = $value;
1222							}
1223						}
1224					}
1225				}
1226			}
1227
1228			// Copy to ['comments_html']
1229			foreach ($ThisFileInfo['comments'] as $field => $values) {
1230				if ($field == 'picture') {
1231					// pictures can take up a lot of space, and we don't need multiple copies of them
1232					// let there be a single copy in [comments][picture], and not elsewhere
1233					continue;
1234				}
1235				foreach ($values as $index => $value) {
1236					if (is_array($value)) {
1237						$ThisFileInfo['comments_html'][$field][$index] = $value;
1238					} else {
1239						$ThisFileInfo['comments_html'][$field][$index] = str_replace('&#0;', '', self::MultiByteCharString2HTML($value, $ThisFileInfo['encoding']));
1240					}
1241				}
1242			}
1243		}
1244		return true;
1245	}
1246
1247
1248	public static function EmbeddedLookup($key, $begin, $end, $file, $name) {
1249
1250		// Cached
1251		static $cache;
1252		if (isset($cache[$file][$name])) {
1253			return (isset($cache[$file][$name][$key]) ? $cache[$file][$name][$key] : '');
1254		}
1255
1256		// Init
1257		$keylength  = strlen($key);
1258		$line_count = $end - $begin - 7;
1259
1260		// Open php file
1261		$fp = fopen($file, 'r');
1262
1263		// Discard $begin lines
1264		for ($i = 0; $i < ($begin + 3); $i++) {
1265			fgets($fp, 1024);
1266		}
1267
1268		// Loop thru line
1269		while (0 < $line_count--) {
1270
1271			// Read line
1272			$line = ltrim(fgets($fp, 1024), "\t ");
1273
1274			// METHOD A: only cache the matching key - less memory but slower on next lookup of not-previously-looked-up key
1275			//$keycheck = substr($line, 0, $keylength);
1276			//if ($key == $keycheck)  {
1277			//	$cache[$file][$name][$keycheck] = substr($line, $keylength + 1);
1278			//	break;
1279			//}
1280
1281			// METHOD B: cache all keys in this lookup - more memory but faster on next lookup of not-previously-looked-up key
1282			//$cache[$file][$name][substr($line, 0, $keylength)] = trim(substr($line, $keylength + 1));
1283			$explodedLine = explode("\t", $line, 2);
1284			$ThisKey   = (isset($explodedLine[0]) ? $explodedLine[0] : '');
1285			$ThisValue = (isset($explodedLine[1]) ? $explodedLine[1] : '');
1286			$cache[$file][$name][$ThisKey] = trim($ThisValue);
1287		}
1288
1289		// Close and return
1290		fclose($fp);
1291		return (isset($cache[$file][$name][$key]) ? $cache[$file][$name][$key] : '');
1292	}
1293
1294	public static function IncludeDependency($filename, $sourcefile, $DieOnFailure=false) {
1295		global $GETID3_ERRORARRAY;
1296
1297		if (file_exists($filename)) {
1298			if (include_once($filename)) {
1299				return true;
1300			} else {
1301				$diemessage = basename($sourcefile).' depends on '.$filename.', which has errors';
1302			}
1303		} else {
1304			$diemessage = basename($sourcefile).' depends on '.$filename.', which is missing';
1305		}
1306		if ($DieOnFailure) {
1307			throw new Exception($diemessage);
1308		} else {
1309			$GETID3_ERRORARRAY[] = $diemessage;
1310		}
1311		return false;
1312	}
1313
1314	public static function trimNullByte($string) {
1315		return trim($string, "\x00");
1316	}
1317
1318	public static function getFileSizeSyscall($path) {
1319		$filesize = false;
1320
1321		if (GETID3_OS_ISWINDOWS) {
1322			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:
1323				$filesystem = new COM('Scripting.FileSystemObject');
1324				$file = $filesystem->GetFile($path);
1325				$filesize = $file->Size();
1326				unset($filesystem, $file);
1327			} else {
1328				$commandline = 'for %I in ('.escapeshellarg($path).') do @echo %~zI';
1329			}
1330		} else {
1331			$commandline = 'ls -l '.escapeshellarg($path).' | awk \'{print $5}\'';
1332		}
1333		if (isset($commandline)) {
1334			$output = trim(`$commandline`);
1335			if (ctype_digit($output)) {
1336				$filesize = (float) $output;
1337			}
1338		}
1339		return $filesize;
1340	}
1341}