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/Vendor/getid3/getid3.lib.php

https://bitbucket.org/nova-atlantis/simple-server-media-player
PHP | 1380 lines | 1094 code | 157 blank | 129 comment | 269 complexity | f5dc3ceece3c4f8307b87057a0985e57 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//          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
  15class 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') && function_exists('libxml_disable_entity_loader')) {
 523			// http://websec.io/2012/08/27/Preventing-XEE-in-PHP.html
 524			// https://core.trac.wordpress.org/changeset/29378
 525			$loader = libxml_disable_entity_loader(true); 
 526			$XMLobject = simplexml_load_string($XMLstring, 'SimpleXMLElement', LIBXML_NOENT); 
 527			$return = self::SimpleXMLelement2array($XMLobject); 
 528			libxml_disable_entity_loader($loader); 
 529			return $return; 
 530		} 
 531		return false;
 532	}
 533
 534	public static function SimpleXMLelement2array($XMLobject) {
 535		if (!is_object($XMLobject) && !is_array($XMLobject)) {
 536			return $XMLobject;
 537		}
 538		$XMLarray = (is_object($XMLobject) ? get_object_vars($XMLobject) : $XMLobject);
 539		foreach ($XMLarray as $key => $value) {
 540			$XMLarray[$key] = self::SimpleXMLelement2array($value);
 541		}
 542		return $XMLarray;
 543	}
 544
 545
 546	// Allan Hansen <ahØartemis*dk>
 547	// self::md5_data() - returns md5sum for a file from startuing position to absolute end position
 548	public static function hash_data($file, $offset, $end, $algorithm) {
 549		static $tempdir = '';
 550		if (!self::intValueSupported($end)) {
 551			return false;
 552		}
 553		switch ($algorithm) {
 554			case 'md5':
 555				$hash_function = 'md5_file';
 556				$unix_call     = 'md5sum';
 557				$windows_call  = 'md5sum.exe';
 558				$hash_length   = 32;
 559				break;
 560
 561			case 'sha1':
 562				$hash_function = 'sha1_file';
 563				$unix_call     = 'sha1sum';
 564				$windows_call  = 'sha1sum.exe';
 565				$hash_length   = 40;
 566				break;
 567
 568			default:
 569				throw new Exception('Invalid algorithm ('.$algorithm.') in self::hash_data()');
 570				break;
 571		}
 572		$size = $end - $offset;
 573		while (true) {
 574			if (GETID3_OS_ISWINDOWS) {
 575
 576				// It seems that sha1sum.exe for Windows only works on physical files, does not accept piped data
 577				// Fall back to create-temp-file method:
 578				if ($algorithm == 'sha1') {
 579					break;
 580				}
 581
 582				$RequiredFiles = array('cygwin1.dll', 'head.exe', 'tail.exe', $windows_call);
 583				foreach ($RequiredFiles as $required_file) {
 584					if (!is_readable(GETID3_HELPERAPPSDIR.$required_file)) {
 585						// helper apps not available - fall back to old method
 586						break 2;
 587					}
 588				}
 589				$commandline  = GETID3_HELPERAPPSDIR.'head.exe -c '.$end.' '.escapeshellarg(str_replace('/', DIRECTORY_SEPARATOR, $file)).' | ';
 590				$commandline .= GETID3_HELPERAPPSDIR.'tail.exe -c '.$size.' | ';
 591				$commandline .= GETID3_HELPERAPPSDIR.$windows_call;
 592
 593			} else {
 594
 595				$commandline  = 'head -c'.$end.' '.escapeshellarg($file).' | ';
 596				$commandline .= 'tail -c'.$size.' | ';
 597				$commandline .= $unix_call;
 598
 599			}
 600			if (preg_match('#(1|ON)#i', ini_get('safe_mode'))) {
 601				//throw new Exception('PHP running in Safe Mode - backtick operator not available, using slower non-system-call '.$algorithm.' algorithm');
 602				break;
 603			}
 604			return substr(`$commandline`, 0, $hash_length);
 605		}
 606
 607		if (empty($tempdir)) {
 608			// yes this is ugly, feel free to suggest a better way
 609			require_once(dirname(__FILE__).'/getid3.php');
 610			$getid3_temp = new getID3();
 611			$tempdir = $getid3_temp->tempdir;
 612			unset($getid3_temp);
 613		}
 614		// try to create a temporary file in the system temp directory - invalid dirname should force to system temp dir
 615		if (($data_filename = tempnam($tempdir, 'gI3')) === false) {
 616			// can't find anywhere to create a temp file, just fail
 617			return false;
 618		}
 619
 620		// Init
 621		$result = false;
 622
 623		// copy parts of file
 624		try {
 625			self::CopyFileParts($file, $data_filename, $offset, $end - $offset);
 626			$result = $hash_function($data_filename);
 627		} catch (Exception $e) {
 628			throw new Exception('self::CopyFileParts() failed in getid_lib::hash_data(): '.$e->getMessage());
 629		}
 630		unlink($data_filename);
 631		return $result;
 632	}
 633
 634	public static function CopyFileParts($filename_source, $filename_dest, $offset, $length) {
 635		if (!self::intValueSupported($offset + $length)) {
 636			throw new Exception('cannot copy file portion, it extends beyond the '.round(PHP_INT_MAX / 1073741824).'GB limit');
 637		}
 638		if (is_readable($filename_source) && is_file($filename_source) && ($fp_src = fopen($filename_source, 'rb'))) {
 639			if (($fp_dest = fopen($filename_dest, 'wb'))) {
 640				if (fseek($fp_src, $offset) == 0) {
 641					$byteslefttowrite = $length;
 642					while (($byteslefttowrite > 0) && ($buffer = fread($fp_src, min($byteslefttowrite, getID3::FREAD_BUFFER_SIZE)))) {
 643						$byteswritten = fwrite($fp_dest, $buffer, $byteslefttowrite);
 644						$byteslefttowrite -= $byteswritten;
 645					}
 646					return true;
 647				} else {
 648					throw new Exception('failed to seek to offset '.$offset.' in '.$filename_source);
 649				}
 650				fclose($fp_dest);
 651			} else {
 652				throw new Exception('failed to create file for writing '.$filename_dest);
 653			}
 654			fclose($fp_src);
 655		} else {
 656			throw new Exception('failed to open file for reading '.$filename_source);
 657		}
 658		return false;
 659	}
 660
 661	public static function iconv_fallback_int_utf8($charval) {
 662		if ($charval < 128) {
 663			// 0bbbbbbb
 664			$newcharstring = chr($charval);
 665		} elseif ($charval < 2048) {
 666			// 110bbbbb 10bbbbbb
 667			$newcharstring  = chr(($charval >>   6) | 0xC0);
 668			$newcharstring .= chr(($charval & 0x3F) | 0x80);
 669		} elseif ($charval < 65536) {
 670			// 1110bbbb 10bbbbbb 10bbbbbb
 671			$newcharstring  = chr(($charval >>  12) | 0xE0);
 672			$newcharstring .= chr(($charval >>   6) | 0xC0);
 673			$newcharstring .= chr(($charval & 0x3F) | 0x80);
 674		} else {
 675			// 11110bbb 10bbbbbb 10bbbbbb 10bbbbbb
 676			$newcharstring  = chr(($charval >>  18) | 0xF0);
 677			$newcharstring .= chr(($charval >>  12) | 0xC0);
 678			$newcharstring .= chr(($charval >>   6) | 0xC0);
 679			$newcharstring .= chr(($charval & 0x3F) | 0x80);
 680		}
 681		return $newcharstring;
 682	}
 683
 684	// ISO-8859-1 => UTF-8
 685	public static function iconv_fallback_iso88591_utf8($string, $bom=false) {
 686		if (function_exists('utf8_encode')) {
 687			return utf8_encode($string);
 688		}
 689		// utf8_encode() unavailable, use getID3()'s iconv_fallback() conversions (possibly PHP is compiled without XML support)
 690		$newcharstring = '';
 691		if ($bom) {
 692			$newcharstring .= "\xEF\xBB\xBF";
 693		}
 694		for ($i = 0; $i < strlen($string); $i++) {
 695			$charval = ord($string{$i});
 696			$newcharstring .= self::iconv_fallback_int_utf8($charval);
 697		}
 698		return $newcharstring;
 699	}
 700
 701	// ISO-8859-1 => UTF-16BE
 702	public static function iconv_fallback_iso88591_utf16be($string, $bom=false) {
 703		$newcharstring = '';
 704		if ($bom) {
 705			$newcharstring .= "\xFE\xFF";
 706		}
 707		for ($i = 0; $i < strlen($string); $i++) {
 708			$newcharstring .= "\x00".$string{$i};
 709		}
 710		return $newcharstring;
 711	}
 712
 713	// ISO-8859-1 => UTF-16LE
 714	public static function iconv_fallback_iso88591_utf16le($string, $bom=false) {
 715		$newcharstring = '';
 716		if ($bom) {
 717			$newcharstring .= "\xFF\xFE";
 718		}
 719		for ($i = 0; $i < strlen($string); $i++) {
 720			$newcharstring .= $string{$i}."\x00";
 721		}
 722		return $newcharstring;
 723	}
 724
 725	// ISO-8859-1 => UTF-16LE (BOM)
 726	public static function iconv_fallback_iso88591_utf16($string) {
 727		return self::iconv_fallback_iso88591_utf16le($string, true);
 728	}
 729
 730	// UTF-8 => ISO-8859-1
 731	public static function iconv_fallback_utf8_iso88591($string) {
 732		if (function_exists('utf8_decode')) {
 733			return utf8_decode($string);
 734		}
 735		// utf8_decode() unavailable, use getID3()'s iconv_fallback() conversions (possibly PHP is compiled without XML support)
 736		$newcharstring = '';
 737		$offset = 0;
 738		$stringlength = strlen($string);
 739		while ($offset < $stringlength) {
 740			if ((ord($string{$offset}) | 0x07) == 0xF7) {
 741				// 11110bbb 10bbbbbb 10bbbbbb 10bbbbbb
 742				$charval = ((ord($string{($offset + 0)}) & 0x07) << 18) &
 743						   ((ord($string{($offset + 1)}) & 0x3F) << 12) &
 744						   ((ord($string{($offset + 2)}) & 0x3F) <<  6) &
 745							(ord($string{($offset + 3)}) & 0x3F);
 746				$offset += 4;
 747			} elseif ((ord($string{$offset}) | 0x0F) == 0xEF) {
 748				// 1110bbbb 10bbbbbb 10bbbbbb
 749				$charval = ((ord($string{($offset + 0)}) & 0x0F) << 12) &
 750						   ((ord($string{($offset + 1)}) & 0x3F) <<  6) &
 751							(ord($string{($offset + 2)}) & 0x3F);
 752				$offset += 3;
 753			} elseif ((ord($string{$offset}) | 0x1F) == 0xDF) {
 754				// 110bbbbb 10bbbbbb
 755				$charval = ((ord($string{($offset + 0)}) & 0x1F) <<  6) &
 756							(ord($string{($offset + 1)}) & 0x3F);
 757				$offset += 2;
 758			} elseif ((ord($string{$offset}) | 0x7F) == 0x7F) {
 759				// 0bbbbbbb
 760				$charval = ord($string{$offset});
 761				$offset += 1;
 762			} else {
 763				// error? throw some kind of warning here?
 764				$charval = false;
 765				$offset += 1;
 766			}
 767			if ($charval !== false) {
 768				$newcharstring .= (($charval < 256) ? chr($charval) : '?');
 769			}
 770		}
 771		return $newcharstring;
 772	}
 773
 774	// UTF-8 => UTF-16BE
 775	public static function iconv_fallback_utf8_utf16be($string, $bom=false) {
 776		$newcharstring = '';
 777		if ($bom) {
 778			$newcharstring .= "\xFE\xFF";
 779		}
 780		$offset = 0;
 781		$stringlength = strlen($string);
 782		while ($offset < $stringlength) {
 783			if ((ord($string{$offset}) | 0x07) == 0xF7) {
 784				// 11110bbb 10bbbbbb 10bbbbbb 10bbbbbb
 785				$charval = ((ord($string{($offset + 0)}) & 0x07) << 18) &
 786						   ((ord($string{($offset + 1)}) & 0x3F) << 12) &
 787						   ((ord($string{($offset + 2)}) & 0x3F) <<  6) &
 788							(ord($string{($offset + 3)}) & 0x3F);
 789				$offset += 4;
 790			} elseif ((ord($string{$offset}) | 0x0F) == 0xEF) {
 791				// 1110bbbb 10bbbbbb 10bbbbbb
 792				$charval = ((ord($string{($offset + 0)}) & 0x0F) << 12) &
 793						   ((ord($string{($offset + 1)}) & 0x3F) <<  6) &
 794							(ord($string{($offset + 2)}) & 0x3F);
 795				$offset += 3;
 796			} elseif ((ord($string{$offset}) | 0x1F) == 0xDF) {
 797				// 110bbbbb 10bbbbbb
 798				$charval = ((ord($string{($offset + 0)}) & 0x1F) <<  6) &
 799							(ord($string{($offset + 1)}) & 0x3F);
 800				$offset += 2;
 801			} elseif ((ord($string{$offset}) | 0x7F) == 0x7F) {
 802				// 0bbbbbbb
 803				$charval = ord($string{$offset});
 804				$offset += 1;
 805			} else {
 806				// error? throw some kind of warning here?
 807				$charval = false;
 808				$offset += 1;
 809			}
 810			if ($charval !== false) {
 811				$newcharstring .= (($charval < 65536) ? self::BigEndian2String($charval, 2) : "\x00".'?');
 812			}
 813		}
 814		return $newcharstring;
 815	}
 816
 817	// UTF-8 => UTF-16LE
 818	public static function iconv_fallback_utf8_utf16le($string, $bom=false) {
 819		$newcharstring = '';
 820		if ($bom) {
 821			$newcharstring .= "\xFF\xFE";
 822		}
 823		$offset = 0;
 824		$stringlength = strlen($string);
 825		while ($offset < $stringlength) {
 826			if ((ord($string{$offset}) | 0x07) == 0xF7) {
 827				// 11110bbb 10bbbbbb 10bbbbbb 10bbbbbb
 828				$charval = ((ord($string{($offset + 0)}) & 0x07) << 18) &
 829						   ((ord($string{($offset + 1)}) & 0x3F) << 12) &
 830						   ((ord($string{($offset + 2)}) & 0x3F) <<  6) &
 831							(ord($string{($offset + 3)}) & 0x3F);
 832				$offset += 4;
 833			} elseif ((ord($string{$offset}) | 0x0F) == 0xEF) {
 834				// 1110bbbb 10bbbbbb 10bbbbbb
 835				$charval = ((ord($string{($offset + 0)}) & 0x0F) << 12) &
 836						   ((ord($string{($offset + 1)}) & 0x3F) <<  6) &
 837							(ord($string{($offset + 2)}) & 0x3F);
 838				$offset += 3;
 839			} elseif ((ord($string{$offset}) | 0x1F) == 0xDF) {
 840				// 110bbbbb 10bbbbbb
 841				$charval = ((ord($string{($offset + 0)}) & 0x1F) <<  6) &
 842							(ord($string{($offset + 1)}) & 0x3F);
 843				$offset += 2;
 844			} elseif ((ord($string{$offset}) | 0x7F) == 0x7F) {
 845				// 0bbbbbbb
 846				$charval = ord($string{$offset});
 847				$offset += 1;
 848			} else {
 849				// error? maybe throw some warning here?
 850				$charval = false;
 851				$offset += 1;
 852			}
 853			if ($charval !== false) {
 854				$newcharstring .= (($charval < 65536) ? self::LittleEndian2String($charval, 2) : '?'."\x00");
 855			}
 856		}
 857		return $newcharstring;
 858	}
 859
 860	// UTF-8 => UTF-16LE (BOM)
 861	public static function iconv_fallback_utf8_utf16($string) {
 862		return self::iconv_fallback_utf8_utf16le($string, true);
 863	}
 864
 865	// UTF-16BE => UTF-8
 866	public static function iconv_fallback_utf16be_utf8($string) {
 867		if (substr($string, 0, 2) == "\xFE\xFF") {
 868			// strip BOM
 869			$string = substr($string, 2);
 870		}
 871		$newcharstring = '';
 872		for ($i = 0; $i < strlen($string); $i += 2) {
 873			$charval = self::BigEndian2Int(substr($string, $i, 2));
 874			$newcharstring .= self::iconv_fallback_int_utf8($charval);
 875		}
 876		return $newcharstring;
 877	}
 878
 879	// UTF-16LE => UTF-8
 880	public static function iconv_fallback_utf16le_utf8($string) {
 881		if (substr($string, 0, 2) == "\xFF\xFE") {
 882			// strip BOM
 883			$string = substr($string, 2);
 884		}
 885		$newcharstring = '';
 886		for ($i = 0; $i < strlen($string); $i += 2) {
 887			$charval = self::LittleEndian2Int(substr($string, $i, 2));
 888			$newcharstring .= self::iconv_fallback_int_utf8($charval);
 889		}
 890		return $newcharstring;
 891	}
 892
 893	// UTF-16BE => ISO-8859-1
 894	public static function iconv_fallback_utf16be_iso88591($string) {
 895		if (substr($string, 0, 2) == "\xFE\xFF") {
 896			// strip BOM
 897			$string = substr($string, 2);
 898		}
 899		$newcharstring = '';
 900		for ($i = 0; $i < strlen($string); $i += 2) {
 901			$charval = self::BigEndian2Int(substr($string, $i, 2));
 902			$newcharstring .= (($charval < 256) ? chr($charval) : '?');
 903		}
 904		return $newcharstring;
 905	}
 906
 907	// UTF-16LE => ISO-8859-1
 908	public static function iconv_fallback_utf16le_iso88591($string) {
 909		if (substr($string, 0, 2) == "\xFF\xFE") {
 910			// strip BOM
 911			$string = substr($string, 2);
 912		}
 913		$newcharstring = '';
 914		for ($i = 0; $i < strlen($string); $i += 2) {
 915			$charval = self::LittleEndian2Int(substr($string, $i, 2));
 916			$newcharstring .= (($charval < 256) ? chr($charval) : '?');
 917		}
 918		return $newcharstring;
 919	}
 920
 921	// UTF-16 (BOM) => ISO-8859-1
 922	public static function iconv_fallback_utf16_iso88591($string) {
 923		$bom = substr($string, 0, 2);
 924		if ($bom == "\xFE\xFF") {
 925			return self::iconv_fallback_utf16be_iso88591(substr($string, 2));
 926		} elseif ($bom == "\xFF\xFE") {
 927			return self::iconv_fallback_utf16le_iso88591(substr($string, 2));
 928		}
 929		return $string;
 930	}
 931
 932	// UTF-16 (BOM) => UTF-8
 933	public static function iconv_fallback_utf16_utf8($string) {
 934		$bom = substr($string, 0, 2);
 935		if ($bom == "\xFE\xFF") {
 936			return self::iconv_fallback_utf16be_utf8(substr($string, 2));
 937		} elseif ($bom == "\xFF\xFE") {
 938			return self::iconv_fallback_utf16le_utf8(substr($string, 2));
 939		}
 940		return $string;
 941	}
 942
 943	public static function iconv_fallback($in_charset, $out_charset, $string) {
 944
 945		if ($in_charset == $out_charset) {
 946			return $string;
 947		}
 948
 949		// iconv() availble
 950		if (function_exists('iconv')) {
 951			if ($converted_string = @iconv($in_charset, $out_charset.'//TRANSLIT', $string)) {
 952				switch ($out_charset) {
 953					case 'ISO-8859-1':
 954						$converted_string = rtrim($converted_string, "\x00");
 955						break;
 956				}
 957				return $converted_string;
 958			}
 959
 960			// iconv() may sometimes fail with "illegal character in input string" error message
 961			// and return an empty string, but returning the unconverted string is more useful
 962			return $string;
 963		}
 964
 965
 966		// iconv() not available
 967		static $ConversionFunctionList = array();
 968		if (empty($ConversionFunctionList)) {
 969			$ConversionFunctionList['ISO-8859-1']['UTF-8']    = 'iconv_fallback_iso88591_utf8';
 970			$ConversionFunctionList['ISO-8859-1']['UTF-16']   = 'iconv_fallback_iso88591_utf16';
 971			$ConversionFunctionList['ISO-8859-1']['UTF-16BE'] = 'iconv_fallback_iso88591_utf16be';
 972			$ConversionFunctionList['ISO-8859-1']['UTF-16LE'] = 'iconv_fallback_iso88591_utf16le';
 973			$ConversionFunctionList['UTF-8']['ISO-8859-1']    = 'iconv_fallback_utf8_iso88591';
 974			$ConversionFunctionList['UTF-8']['UTF-16']        = 'iconv_fallback_utf8_utf16';
 975			$ConversionFunctionList['UTF-8']['UTF-16BE']      = 'iconv_fallback_utf8_utf16be';
 976			$ConversionFunctionList['UTF-8']['UTF-16LE']      = 'iconv_fallback_utf8_utf16le';
 977			$ConversionFunctionList['UTF-16']['ISO-8859-1']   = 'iconv_fallback_utf16_iso88591';
 978			$ConversionFunctionList['UTF-16']['UTF-8']        = 'iconv_fallback_utf16_utf8';
 979			$ConversionFunctionList['UTF-16LE']['ISO-8859-1'] = 'iconv_fallback_utf16le_iso88591';
 980			$ConversionFunctionList['UTF-16LE']['UTF-8']      = 'iconv_fallback_utf16le_utf8';
 981			$ConversionFunctionList['UTF-16BE']['ISO-8859-1'] = 'iconv_fallback_utf16be_iso88591';
 982			$ConversionFunctionList['UTF-16BE']['UTF-8']      = 'iconv_fallback_utf16be_utf8';
 983		}
 984		if (isset($ConversionFunctionList[strtoupper($in_charset)][strtoupper($out_charset)])) {
 985			$ConversionFunction = $ConversionFunctionList[strtoupper($in_charset)][strtoupper($out_charset)];
 986			return self::$ConversionFunction($string);
 987		}
 988		throw new Exception('PHP does not have iconv() support - cannot convert from '.$in_charset.' to '.$out_charset);
 989	}
 990
 991	public static function recursiveMultiByteCharString2HTML($data, $charset='ISO-8859-1') {
 992		if (is_string($data)) {
 993			return self::MultiByteCharString2HTML($data, $charset);
 994		} elseif (is_array($data)) {
 995			$return_data = array();
 996			foreach ($data as $key => $value) {
 997				$return_data[$key] = self::recursiveMultiByteCharString2HTML($value, $charset);
 998			}
 999			return $return_data;
1000		}
1001		// integer, float, objects, resources, etc
1002		return $data;
1003	}
1004
1005	public static function MultiByteCharString2HTML($string, $charset='ISO-8859-1') {
1006		$string = (string) $string; // in case trying to pass a numeric (float, int) string, would otherwise return an empty string
1007		$HTMLstring = '';
1008
1009		switch ($charset) {
1010			case '1251':
1011			case '1252':
1012			case '866':
1013			case '932':
1014			case '936':
1015			case '950':
1016			case 'BIG5':
1017			case 'BIG5-HKSCS':
1018			case 'cp1251':
1019			case 'cp1252':
1020			case 'cp866':
1021			case 'EUC-JP':
1022			case 'EUCJP':
1023			case 'GB2312':
1024			case 'ibm866':
1025			case 'ISO-8859-1':
1026			case 'ISO-8859-15':
1027			case 'ISO8859-1':
1028			case 'ISO8859-15':
1029			case 'KOI8-R':
1030			case 'koi8-ru':
1031			case 'koi8r':
1032			case 'Shift_JIS':
1033			case 'SJIS':
1034			case 'win-1251':
1035			case 'Windows-1251':
1036			case 'Windows-1252':
1037				$HTMLstring = htmlentities($string, ENT_COMPAT, $charset);
1038				break;
1039
1040			case 'UTF-8':
1041				$strlen = strlen($string);
1042				for ($i = 0; $i < $strlen; $i++) {
1043					$char_ord_val = ord($string{$i});
1044					$charval = 0;
1045					if ($char_ord_val < 0x80) {
1046						$charval = $char_ord_val;
1047					} elseif ((($char_ord_val & 0xF0) >> 4) == 0x0F  &&  $i+3 < $strlen) {
1048						$charval  = (($char_ord_val & 0x07) << 18);
1049						$charval += ((ord($string{++$i}) & 0x3F) << 12);
1050						$charval += ((ord($string{++$i}) & 0x3F) << 6);
1051						$charval +=  (ord($string{++$i}) & 0x3F);
1052					} elseif ((($char_ord_val & 0xE0) >> 5) == 0x07  &&  $i+2 < $strlen) {
1053						$charval  = (($char_ord_val & 0x0F) << 12);
1054						$charval += ((ord($string{++$i}) & 0x3F) << 6);
1055						$charval +=  (ord($string{++$i}) & 0x3F);
1056					} elseif ((($char_ord_val & 0xC0) >> 6) == 0x03  &&  $i+1 < $strlen) {
1057						$charval  = (($char_ord_val & 0x1F) << 6);
1058						$charval += (ord($string{++$i}) & 0x3F);
1059					}
1060					if (($charval >= 32) && ($charval <= 127)) {
1061						$HTMLstring .= htmlentities(chr($charval));
1062					} else {
1063						$HTMLstring .= '&#'.$charval.';';
1064					}
1065				}
1066				break;
1067
1068			case 'UTF-16LE':
1069				for ($i = 0; $i < strlen($string); $i += 2) {
1070					$charval = self::LittleEndian2Int(substr($string, $i, 2));
1071					if (($charval >= 32) && ($charval <= 127)) {
1072						$HTMLstring .= chr($charval);
1073					} else {
1074						$HTMLstring .= '&#'.$charval.';';
1075					}
1076				}
1077				break;
1078
1079			case 'UTF-16BE':
1080				for ($i = 0; $i < strlen($string); $i += 2) {
1081					$charval = self::BigEndian2Int(substr($string, $i, 2));
1082					if (($charval >= 32) && ($charval <= 127)) {
1083						$HTMLstring .= chr($charval);
1084					} else {
1085						$HTMLstring .= '&#'.$charval.';';
1086					}
1087				}
1088				break;
1089
1090			default:
1091				$HTMLstring = 'ERROR: Character set "'.$charset.'" not supported in MultiByteCharString2HTML()';
1092				break;
1093		}
1094		return $HTMLstring;
1095	}
1096
1097
1098
1099	public static function RGADnameLookup($namecode) {
1100		static $RGADname = array();
1101		if (empty($RGADname)) {
1102			$RGADname[0] = 'not set';
1103			$RGADname[1] = 'Track Gain Adjustment';
1104			$RGADname[2] = 'Album Gain Adjustment';
1105		}
1106
1107		return (isset($RGADname[$namecode]) ? $RGADname[$namecode] : '');
1108	}
1109
1110
1111	public static function RGADoriginatorLookup($originatorcode) {
1112		static $RGADoriginator = array();
1113		if (empty($RGADoriginator)) {
1114			$RGADoriginator[0] = 'unspecified';
1115			$RGADoriginator[1] = 'pre-set by artist/producer/mastering engineer';
1116			$RGADoriginator[2] = 'set by user';
1117			$RGADoriginator[3] = 'determined automatically';
1118		}
1119
1120		return (isset($RGADoriginator[$originatorcode]) ? $RGADoriginator[$originatorcode] : '');
1121	}
1122
1123
1124	public static function RGADadjustmentLookup($rawadjustment, $signbit) {
1125		$adjustment = $rawadjustment / 10;
1126		if ($signbit == 1) {
1127			$adjustment *= -1;
1128		}
1129		return (float) $adjustment;
1130	}
1131
1132
1133	public static function RGADgainString($namecode, $originatorcode, $replaygain) {
1134		if ($replaygain < 0) {
1135			$signbit = '1';
1136		} else {
1137			$signbit = '0';
1138		}
1139		$storedreplaygain = intval(round($replaygain * 10));
1140		$gainstring  = str_pad(decbin($namecode), 3, '0', STR_PAD_LEFT);
1141		$gainstring .= str_pad(decbin($originatorcode), 3, '0', STR_PAD_LEFT);
1142		$gainstring .= $signbit;
1143		$gainstring .= str_pad(decbin($storedreplaygain), 9, '0', STR_PAD_LEFT);
1144
1145		return $gainstring;
1146	}
1147
1148	public static function RGADamplitude2dB($amplitude) {
1149		return 20 * log10($amplitude);
1150	}
1151
1152
1153	public static function GetDataImageSize($imgData, &$imageinfo=array()) {
1154		static $tempdir = '';
1155		if (empty($tempdir)) {
1156			// yes this is ugly, feel free to suggest a better way
1157			require_once(dirname(__FILE__).'/getid3.php');
1158			$getid3_temp = new getID3();
1159			$tempdir = $getid3_temp->tempdir;
1160			unset($getid3_temp);
1161		}
1162		$GetDataImageSize = false;
1163		if ($tempfilename = tempnam($tempdir, 'gI3')) {
1164			if (is_writable($tempfilename) && is_file($tempfilename) && ($tmp = fopen($tempfilename, 'wb'))) {
1165				fwrite($tmp, $imgData);
1166				fclose($tmp);
1167				$GetDataImageSize = @getimagesize($tempfilename, $imageinfo);
1168				$GetDataImageSize['height'] = $GetDataImageSize[0];
1169				$GetDataImageSize['width']  = $GetDataImageSize[1];
1170			}
1171			unlink($tempfilename);
1172		}
1173		return $GetDataImageSize;
1174	}
1175
1176	public static function ImageExtFromMime($mime_type) {
1177		// temporary way, works OK for now, but should be reworked in the future
1178		return str_replace(array('image/', 'x-', 'jpeg'), array('', '', 'jpg'), $mime_type);
1179	}
1180
1181	public static function ImageTypesLookup($imagetypeid) {
1182		static $ImageTypesLookup = array();
1183		if (empty($ImageTypesLookup)) {
1184			$ImageTypesLookup[1]  = 'gif';
1185			$ImageTypesLookup[2]  = 'jpeg';
1186			$ImageTypesLookup[3]  = 'png';
1187			$ImageTypesLookup[4]  = 'swf';
1188			$ImageTypesLookup[5]  = 'psd';
1189			$ImageTypesLookup[6]  = 'bmp';
1190			$ImageTypesLookup[7]  = 'tiff (little-endian)';
1191			$ImageTypesLookup[8]  = 'tiff (big-endian)';
1192			$ImageTypesLookup[9]  = 'jpc';
1193			$ImageTypesLookup[10] = 'jp2';
1194			$ImageTypesLookup[11] = 'jpx';
1195			$ImageTypesLookup[12] = 'jb2';
1196			$ImageTypesLookup[13] = 'swc';
1197			$ImageTypesLookup[14] = 'iff';
1198		}
1199		return (isset($ImageTypesLookup[$imagetypeid]) ? $ImageTypesLookup[$imagetypeid] : '');
1200	}
1201
1202	public static function CopyTagsToComments(&$ThisFileInfo) {
1203
1204		// Copy all entries from ['tags'] into common ['comments']
1205		if (!empty($ThisFileInfo['tags'])) {
1206			foreach ($ThisFileInfo['tags'] as $tagtype => $tagarray) {
1207				foreach ($tagarray as $tagname => $tagdata) {
1208					foreach ($tagdata as $key => $value) {
1209						if (!empty($value)) {
1210							if (empty($ThisFileInfo['comments'][$tagname])) {
1211
1212								// fall through and append value
1213
1214							} elseif ($tagtype == 'id3v1') {
1215
1216								$newvaluelength = strlen(trim($value));
1217								foreach ($ThisFileInfo['comments'][$tagname] as $existingkey => $existingvalue) {
1218									$oldvaluelength = strlen(trim($existingvalue));
1219									if (($newvaluelength <= $oldvaluelength) && (substr($existingvalue, 0, $newvaluelength) == trim($value))) {
1220										// new value is identical but shorter-than (or equal-length to) one already in comments - skip
1221										break 2;
1222									}
1223								}
1224
1225							} elseif (!is_array($value)) {
1226
1227								$newvaluelength = strlen(trim($value));
1228								foreach ($ThisFileInfo['comments'][$tagname] as $existingkey => $existingvalue) {
1229									$oldvaluelength = strlen(trim($existingvalue));
1230									if ((strlen($existingvalue) > 10) && ($newvaluelength > $oldvaluelength) && (substr(trim($value), 0, strlen($existingvalue)) == $existingvalue)) {
1231										$ThisFileInfo['comments'][$tagname][$existingkey] = trim($value);
1232										//break 2;
1233										break;
1234									}
1235								}
1236
1237							}
1238							if (is_array($value) || empty($ThisFileInfo['comments'][$tagname]) || !in_array(trim($value), $ThisFileInfo['comments'][$tagname])) {
1239								$value = (is_string($value) ? trim($value) : $value);
1240								if (!is_numeric($key)) {
1241									$ThisFileInfo['comments'][$tagname][$key] = $value;
1242								} else {
1243									$ThisFileInfo['comments'][$tagname][]     = $value;
1244								}
1245							}
1246						}
1247					}
1248				}
1249			}
1250
1251			// Copy to ['comments_html']
1252			if (!empty($ThisFileInfo['comments'])) {
1253				foreach ($ThisFileInfo['comments'] as $field => $values) {
1254					if ($field == 'picture') {
1255						// pictures can take up a lot of space, and we don't need multiple copies of them
1256						// let there be a single copy in [comments][picture], and not elsewhere
1257						continue;
1258					}
1259					foreach ($values as $index => $value) {
1260						if (is_array($value)) {
1261							$ThisFileInfo['comments_html'][$field][$index] = $value;
1262						} else {
1263							$ThisFileInfo['comments_html'][$field][$index] = str_replace('&#0;', '', self::MultiByteCharString2HTML($value, $ThisFileInfo['encoding']));
1264						}
1265					}
1266				}
1267			}
1268
1269		}
1270		return true;
1271	}
1272
1273
1274	public static function EmbeddedLookup($key, $begin, $end, $file, $name) {
1275
1276		// Cached
1277		static $cache;
1278		if (isset($cache[$file][$name])) {
1279			return (isset($cache[$file][$name][$key]) ? $cache[$file][$name][$key] : '');
1280		}
1281
1282		// Init
1283		$keylength  = strlen($key);
1284		$line_count = $end - $begin - 7;
1285
1286		// Open php file
1287		$fp = fopen($file, 'r');
1288
1289		// Discard $begin lines
1290		for ($i = 0; $i < ($begin + 3); $i++) {
1291			fgets($fp, 1024);
1292		}
1293
1294		// Loop thru line
1295		while (0 < $line_count--) {
1296
1297			// Read line
1298			$line = ltrim(fgets($fp, 1024), "\t ");
1299
1300			// METHOD A: only cache the matching key - less memory but slower on next lookup of not-previously-looked-up key
1301			//$keycheck = substr($line, 0, $keylength);
1302			//if ($key == $keycheck)  {
1303			//	$cache[$file][$name][$keycheck] = substr($line, $keylength + 1);
1304			//	break;
1305			//}
1306
1307			// METHOD B: cache all keys in this lookup - more memory but faster on next lookup of not-previously-looked-up key
1308			//$cache[$file][$name][substr($line, 0, $keylength)] = trim(substr($line, $keylength + 1));
1309			$explodedLine = explode("\t", $line, 2);
1310			$ThisKey   = (isset($explodedLine[0]) ? $explodedLine[0] : '');
1311			$ThisValue = (isset($explodedLine[1]) ? $explodedLine[1] : '');
1312			$cache[$file][$name][$ThisKey] = trim($ThisValue);
1313		}
1314
1315		// Close and return
1316		fclose($fp);
1317		return (isset($cache[$file][$name][$key]) ? $cache[$file][$name][$key] : '');
1318	}
1319
1320	public static function IncludeDependency($filename, $sourcefile, $DieOnFailure=false) {
1321		global $GETID3_ERRORARRAY;
1322
1323		if (file_exists($filename)) {
1324			if (include_once($filename)) {
1325				return true;
1326			} else {
1327				$diemessage = basename($sourcefile).' depends on '.$filename.', which has errors';
1328			}
1329		} else {
1330			$diemessage = basename($sourcefile).' depends on '.$filename.', which is missing';
1331		}
1332		if ($DieOnFailure) {
1333			throw new Exception($diemessage);
1334		} else {
1335			$GETID3_ERRORARRAY[] = $diemessage;
1336		}
1337		return false;
1338	}
1339
1340	public static function trimNullByte($string) {
1341		return trim($string, "\x00");
1342	}
1343
1344	public static function getFileSizeSyscall($path) {
1345		$filesize = false;
1346
1347		if (GETID3_OS_ISWINDOWS) {
1348			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:
1349				$filesystem = new COM('Scripting.FileSystemObject');
1350				$file = $filesystem->GetFile($path);
1351				$filesize = $file->Size();
1352				unset($filesystem, $file);
1353			} else {
1354				$commandline = 'for %I in ('.escapeshellarg($path).') do @echo %~zI';
1355			}
1356		} else {
1357			$commandline = 'ls -l '.escapeshellarg($path).' | awk \'{print $5}\'';
1358		}
1359		if (isset($commandline)) {
1360			$output = trim(`$commandline`);
1361			if (ctype_digit($output)) {
1362				$filesize = (float) $output;
1363			}
1364		}
1365		return $filesize;
1366	}
1367
1368
1369	/**
1370	* Workaround for Bug #37268 (https://bugs.php.net/bug.php?id=37268)
1371	* @param string $path A path.
1372	* @param string $suffix If the name component ends in suffix this will also be cut off.
1373	* @return string
1374	*/
1375	public static function mb_basename($path, $suffix = null) {
1376		$splited = preg_split('#/#', rtrim($path, '/ '));
1377		return substr(basename('X'.$splited[count($splited) - 1], $suffix), 1);
1378	}
1379
1380}