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/sys/plugins/id3/getid3/getid3.lib.php

https://bitbucket.org/DESURE/dcms
PHP | 1379 lines | 1094 code | 157 blank | 128 comment | 270 complexity | d8424af6543fc49593af3a4e2bf37e9a 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')) {
 523			if (function_exists('get_object_vars')) {
 524				if (function_exists('libxml_disable_entity_loader')) { // (PHP 5 >= 5.2.11)
 525					// http://websec.io/2012/08/27/Preventing-XEE-in-PHP.html
 526					libxml_disable_entity_loader(true);
 527				}
 528				$XMLobject = simplexml_load_string($XMLstring);
 529				return self::SimpleXMLelement2array($XMLobject);
 530			}
 531		}
 532		return false;
 533	}
 534
 535	public static function SimpleXMLelement2array($XMLobject) {
 536		if (!is_object($XMLobject) && !is_array($XMLobject)) {
 537			return $XMLobject;
 538		}
 539		$XMLarray = (is_object($XMLobject) ? get_object_vars($XMLobject) : $XMLobject);
 540		foreach ($XMLarray as $key => $value) {
 541			$XMLarray[$key] = self::SimpleXMLelement2array($value);
 542		}
 543		return $XMLarray;
 544	}
 545
 546
 547	// Allan Hansen <ahØartemis*dk>
 548	// self::md5_data() - returns md5sum for a file from startuing position to absolute end position
 549	public static function hash_data($file, $offset, $end, $algorithm) {
 550		static $tempdir = '';
 551		if (!self::intValueSupported($end)) {
 552			return false;
 553		}
 554		switch ($algorithm) {
 555			case 'md5':
 556				$hash_function = 'md5_file';
 557				$unix_call     = 'md5sum';
 558				$windows_call  = 'md5sum.exe';
 559				$hash_length   = 32;
 560				break;
 561
 562			case 'sha1':
 563				$hash_function = 'sha1_file';
 564				$unix_call     = 'sha1sum';
 565				$windows_call  = 'sha1sum.exe';
 566				$hash_length   = 40;
 567				break;
 568
 569			default:
 570				throw new Exception('Invalid algorithm ('.$algorithm.') in self::hash_data()');
 571				break;
 572		}
 573		$size = $end - $offset;
 574		while (true) {
 575			if (GETID3_OS_ISWINDOWS) {
 576
 577				// It seems that sha1sum.exe for Windows only works on physical files, does not accept piped data
 578				// Fall back to create-temp-file method:
 579				if ($algorithm == 'sha1') {
 580					break;
 581				}
 582
 583				$RequiredFiles = array('cygwin1.dll', 'head.exe', 'tail.exe', $windows_call);
 584				foreach ($RequiredFiles as $required_file) {
 585					if (!is_readable(GETID3_HELPERAPPSDIR.$required_file)) {
 586						// helper apps not available - fall back to old method
 587						break 2;
 588					}
 589				}
 590				$commandline  = GETID3_HELPERAPPSDIR.'head.exe -c '.$end.' '.escapeshellarg(str_replace('/', DIRECTORY_SEPARATOR, $file)).' | ';
 591				$commandline .= GETID3_HELPERAPPSDIR.'tail.exe -c '.$size.' | ';
 592				$commandline .= GETID3_HELPERAPPSDIR.$windows_call;
 593
 594			} else {
 595
 596				$commandline  = 'head -c'.$end.' '.escapeshellarg($file).' | ';
 597				$commandline .= 'tail -c'.$size.' | ';
 598				$commandline .= $unix_call;
 599
 600			}
 601			if (preg_match('#(1|ON)#i', ini_get('safe_mode'))) {
 602				//throw new Exception('PHP running in Safe Mode - backtick operator not available, using slower non-system-call '.$algorithm.' algorithm');
 603				break;
 604			}
 605			return substr(`$commandline`, 0, $hash_length);
 606		}
 607
 608		if (empty($tempdir)) {
 609			// yes this is ugly, feel free to suggest a better way
 610			require_once(dirname(__FILE__).'/getid3.php');
 611			$getid3_temp = new getID3();
 612			$tempdir = $getid3_temp->tempdir;
 613			unset($getid3_temp);
 614		}
 615		// try to create a temporary file in the system temp directory - invalid dirname should force to system temp dir
 616		if (($data_filename = tempnam($tempdir, 'gI3')) === false) {
 617			// can't find anywhere to create a temp file, just fail
 618			return false;
 619		}
 620
 621		// Init
 622		$result = false;
 623
 624		// copy parts of file
 625		try {
 626			self::CopyFileParts($file, $data_filename, $offset, $end - $offset);
 627			$result = $hash_function($data_filename);
 628		} catch (Exception $e) {
 629			throw new Exception('self::CopyFileParts() failed in getid_lib::hash_data(): '.$e->getMessage());
 630		}
 631		unlink($data_filename);
 632		return $result;
 633	}
 634
 635	public static function CopyFileParts($filename_source, $filename_dest, $offset, $length) {
 636		if (!self::intValueSupported($offset + $length)) {
 637			throw new Exception('cannot copy file portion, it extends beyond the '.round(PHP_INT_MAX / 1073741824).'GB limit');
 638		}
 639		if (is_readable($filename_source) && is_file($filename_source) && ($fp_src = fopen($filename_source, 'rb'))) {
 640			if (($fp_dest = fopen($filename_dest, 'wb'))) {
 641				if (fseek($fp_src, $offset) == 0) {
 642					$byteslefttowrite = $length;
 643					while (($byteslefttowrite > 0) && ($buffer = fread($fp_src, min($byteslefttowrite, getID3::FREAD_BUFFER_SIZE)))) {
 644						$byteswritten = fwrite($fp_dest, $buffer, $byteslefttowrite);
 645						$byteslefttowrite -= $byteswritten;
 646					}
 647					return true;
 648				} else {
 649					throw new Exception('failed to seek to offset '.$offset.' in '.$filename_source);
 650				}
 651				fclose($fp_dest);
 652			} else {
 653				throw new Exception('failed to create file for writing '.$filename_dest);
 654			}
 655			fclose($fp_src);
 656		} else {
 657			throw new Exception('failed to open file for reading '.$filename_source);
 658		}
 659		return false;
 660	}
 661
 662	public static function iconv_fallback_int_utf8($charval) {
 663		if ($charval < 128) {
 664			// 0bbbbbbb
 665			$newcharstring = chr($charval);
 666		} elseif ($charval < 2048) {
 667			// 110bbbbb 10bbbbbb
 668			$newcharstring  = chr(($charval >>   6) | 0xC0);
 669			$newcharstring .= chr(($charval & 0x3F) | 0x80);
 670		} elseif ($charval < 65536) {
 671			// 1110bbbb 10bbbbbb 10bbbbbb
 672			$newcharstring  = chr(($charval >>  12) | 0xE0);
 673			$newcharstring .= chr(($charval >>   6) | 0xC0);
 674			$newcharstring .= chr(($charval & 0x3F) | 0x80);
 675		} else {
 676			// 11110bbb 10bbbbbb 10bbbbbb 10bbbbbb
 677			$newcharstring  = chr(($charval >>  18) | 0xF0);
 678			$newcharstring .= chr(($charval >>  12) | 0xC0);
 679			$newcharstring .= chr(($charval >>   6) | 0xC0);
 680			$newcharstring .= chr(($charval & 0x3F) | 0x80);
 681		}
 682		return $newcharstring;
 683	}
 684
 685	// ISO-8859-1 => UTF-8
 686	public static function iconv_fallback_iso88591_utf8($string, $bom=false) {
 687		if (function_exists('utf8_encode')) {
 688			return utf8_encode($string);
 689		}
 690		// utf8_encode() unavailable, use getID3()'s iconv_fallback() conversions (possibly PHP is compiled without XML support)
 691		$newcharstring = '';
 692		if ($bom) {
 693			$newcharstring .= "\xEF\xBB\xBF";
 694		}
 695		for ($i = 0; $i < strlen($string); $i++) {
 696			$charval = ord($string{$i});
 697			$newcharstring .= self::iconv_fallback_int_utf8($charval);
 698		}
 699		return $newcharstring;
 700	}
 701
 702	// ISO-8859-1 => UTF-16BE
 703	public static function iconv_fallback_iso88591_utf16be($string, $bom=false) {
 704		$newcharstring = '';
 705		if ($bom) {
 706			$newcharstring .= "\xFE\xFF";
 707		}
 708		for ($i = 0; $i < strlen($string); $i++) {
 709			$newcharstring .= "\x00".$string{$i};
 710		}
 711		return $newcharstring;
 712	}
 713
 714	// ISO-8859-1 => UTF-16LE
 715	public static function iconv_fallback_iso88591_utf16le($string, $bom=false) {
 716		$newcharstring = '';
 717		if ($bom) {
 718			$newcharstring .= "\xFF\xFE";
 719		}
 720		for ($i = 0; $i < strlen($string); $i++) {
 721			$newcharstring .= $string{$i}."\x00";
 722		}
 723		return $newcharstring;
 724	}
 725
 726	// ISO-8859-1 => UTF-16LE (BOM)
 727	public static function iconv_fallback_iso88591_utf16($string) {
 728		return self::iconv_fallback_iso88591_utf16le($string, true);
 729	}
 730
 731	// UTF-8 => ISO-8859-1
 732	public static function iconv_fallback_utf8_iso88591($string) {
 733		if (function_exists('utf8_decode')) {
 734			return utf8_decode($string);
 735		}
 736		// utf8_decode() unavailable, use getID3()'s iconv_fallback() conversions (possibly PHP is compiled without XML support)
 737		$newcharstring = '';
 738		$offset = 0;
 739		$stringlength = strlen($string);
 740		while ($offset < $stringlength) {
 741			if ((ord($string{$offset}) | 0x07) == 0xF7) {
 742				// 11110bbb 10bbbbbb 10bbbbbb 10bbbbbb
 743				$charval = ((ord($string{($offset + 0)}) & 0x07) << 18) &
 744						   ((ord($string{($offset + 1)}) & 0x3F) << 12) &
 745						   ((ord($string{($offset + 2)}) & 0x3F) <<  6) &
 746							(ord($string{($offset + 3)}) & 0x3F);
 747				$offset += 4;
 748			} elseif ((ord($string{$offset}) | 0x0F) == 0xEF) {
 749				// 1110bbbb 10bbbbbb 10bbbbbb
 750				$charval = ((ord($string{($offset + 0)}) & 0x0F) << 12) &
 751						   ((ord($string{($offset + 1)}) & 0x3F) <<  6) &
 752							(ord($string{($offset + 2)}) & 0x3F);
 753				$offset += 3;
 754			} elseif ((ord($string{$offset}) | 0x1F) == 0xDF) {
 755				// 110bbbbb 10bbbbbb
 756				$charval = ((ord($string{($offset + 0)}) & 0x1F) <<  6) &
 757							(ord($string{($offset + 1)}) & 0x3F);
 758				$offset += 2;
 759			} elseif ((ord($string{$offset}) | 0x7F) == 0x7F) {
 760				// 0bbbbbbb
 761				$charval = ord($string{$offset});
 762				$offset += 1;
 763			} else {
 764				// error? throw some kind of warning here?
 765				$charval = false;
 766				$offset += 1;
 767			}
 768			if ($charval !== false) {
 769				$newcharstring .= (($charval < 256) ? chr($charval) : '?');
 770			}
 771		}
 772		return $newcharstring;
 773	}
 774
 775	// UTF-8 => UTF-16BE
 776	public static function iconv_fallback_utf8_utf16be($string, $bom=false) {
 777		$newcharstring = '';
 778		if ($bom) {
 779			$newcharstring .= "\xFE\xFF";
 780		}
 781		$offset = 0;
 782		$stringlength = strlen($string);
 783		while ($offset < $stringlength) {
 784			if ((ord($string{$offset}) | 0x07) == 0xF7) {
 785				// 11110bbb 10bbbbbb 10bbbbbb 10bbbbbb
 786				$charval = ((ord($string{($offset + 0)}) & 0x07) << 18) &
 787						   ((ord($string{($offset + 1)}) & 0x3F) << 12) &
 788						   ((ord($string{($offset + 2)}) & 0x3F) <<  6) &
 789							(ord($string{($offset + 3)}) & 0x3F);
 790				$offset += 4;
 791			} elseif ((ord($string{$offset}) | 0x0F) == 0xEF) {
 792				// 1110bbbb 10bbbbbb 10bbbbbb
 793				$charval = ((ord($string{($offset + 0)}) & 0x0F) << 12) &
 794						   ((ord($string{($offset + 1)}) & 0x3F) <<  6) &
 795							(ord($string{($offset + 2)}) & 0x3F);
 796				$offset += 3;
 797			} elseif ((ord($string{$offset}) | 0x1F) == 0xDF) {
 798				// 110bbbbb 10bbbbbb
 799				$charval = ((ord($string{($offset + 0)}) & 0x1F) <<  6) &
 800							(ord($string{($offset + 1)}) & 0x3F);
 801				$offset += 2;
 802			} elseif ((ord($string{$offset}) | 0x7F) == 0x7F) {
 803				// 0bbbbbbb
 804				$charval = ord($string{$offset});
 805				$offset += 1;
 806			} else {
 807				// error? throw some kind of warning here?
 808				$charval = false;
 809				$offset += 1;
 810			}
 811			if ($charval !== false) {
 812				$newcharstring .= (($charval < 65536) ? self::BigEndian2String($charval, 2) : "\x00".'?');
 813			}
 814		}
 815		return $newcharstring;
 816	}
 817
 818	// UTF-8 => UTF-16LE
 819	public static function iconv_fallback_utf8_utf16le($string, $bom=false) {
 820		$newcharstring = '';
 821		if ($bom) {
 822			$newcharstring .= "\xFF\xFE";
 823		}
 824		$offset = 0;
 825		$stringlength = strlen($string);
 826		while ($offset < $stringlength) {
 827			if ((ord($string{$offset}) | 0x07) == 0xF7) {
 828				// 11110bbb 10bbbbbb 10bbbbbb 10bbbbbb
 829				$charval = ((ord($string{($offset + 0)}) & 0x07) << 18) &
 830						   ((ord($string{($offset + 1)}) & 0x3F) << 12) &
 831						   ((ord($string{($offset + 2)}) & 0x3F) <<  6) &
 832							(ord($string{($offset + 3)}) & 0x3F);
 833				$offset += 4;
 834			} elseif ((ord($string{$offset}) | 0x0F) == 0xEF) {
 835				// 1110bbbb 10bbbbbb 10bbbbbb
 836				$charval = ((ord($string{($offset + 0)}) & 0x0F) << 12) &
 837						   ((ord($string{($offset + 1)}) & 0x3F) <<  6) &
 838							(ord($string{($offset + 2)}) & 0x3F);
 839				$offset += 3;
 840			} elseif ((ord($string{$offset}) | 0x1F) == 0xDF) {
 841				// 110bbbbb 10bbbbbb
 842				$charval = ((ord($string{($offset + 0)}) & 0x1F) <<  6) &
 843							(ord($string{($offset + 1)}) & 0x3F);
 844				$offset += 2;
 845			} elseif ((ord($string{$offset}) | 0x7F) == 0x7F) {
 846				// 0bbbbbbb
 847				$charval = ord($string{$offset});
 848				$offset += 1;
 849			} else {
 850				// error? maybe throw some warning here?
 851				$charval = false;
 852				$offset += 1;
 853			}
 854			if ($charval !== false) {
 855				$newcharstring .= (($charval < 65536) ? self::LittleEndian2String($charval, 2) : '?'."\x00");
 856			}
 857		}
 858		return $newcharstring;
 859	}
 860
 861	// UTF-8 => UTF-16LE (BOM)
 862	public static function iconv_fallback_utf8_utf16($string) {
 863		return self::iconv_fallback_utf8_utf16le($string, true);
 864	}
 865
 866	// UTF-16BE => UTF-8
 867	public static function iconv_fallback_utf16be_utf8($string) {
 868		if (substr($string, 0, 2) == "\xFE\xFF") {
 869			// strip BOM
 870			$string = substr($string, 2);
 871		}
 872		$newcharstring = '';
 873		for ($i = 0; $i < strlen($string); $i += 2) {
 874			$charval = self::BigEndian2Int(substr($string, $i, 2));
 875			$newcharstring .= self::iconv_fallback_int_utf8($charval);
 876		}
 877		return $newcharstring;
 878	}
 879
 880	// UTF-16LE => UTF-8
 881	public static function iconv_fallback_utf16le_utf8($string) {
 882		if (substr($string, 0, 2) == "\xFF\xFE") {
 883			// strip BOM
 884			$string = substr($string, 2);
 885		}
 886		$newcharstring = '';
 887		for ($i = 0; $i < strlen($string); $i += 2) {
 888			$charval = self::LittleEndian2Int(substr($string, $i, 2));
 889			$newcharstring .= self::iconv_fallback_int_utf8($charval);
 890		}
 891		return $newcharstring;
 892	}
 893
 894	// UTF-16BE => ISO-8859-1
 895	public static function iconv_fallback_utf16be_iso88591($string) {
 896		if (substr($string, 0, 2) == "\xFE\xFF") {
 897			// strip BOM
 898			$string = substr($string, 2);
 899		}
 900		$newcharstring = '';
 901		for ($i = 0; $i < strlen($string); $i += 2) {
 902			$charval = self::BigEndian2Int(substr($string, $i, 2));
 903			$newcharstring .= (($charval < 256) ? chr($charval) : '?');
 904		}
 905		return $newcharstring;
 906	}
 907
 908	// UTF-16LE => ISO-8859-1
 909	public static function iconv_fallback_utf16le_iso88591($string) {
 910		if (substr($string, 0, 2) == "\xFF\xFE") {
 911			// strip BOM
 912			$string = substr($string, 2);
 913		}
 914		$newcharstring = '';
 915		for ($i = 0; $i < strlen($string); $i += 2) {
 916			$charval = self::LittleEndian2Int(substr($string, $i, 2));
 917			$newcharstring .= (($charval < 256) ? chr($charval) : '?');
 918		}
 919		return $newcharstring;
 920	}
 921
 922	// UTF-16 (BOM) => ISO-8859-1
 923	public static function iconv_fallback_utf16_iso88591($string) {
 924		$bom = substr($string, 0, 2);
 925		if ($bom == "\xFE\xFF") {
 926			return self::iconv_fallback_utf16be_iso88591(substr($string, 2));
 927		} elseif ($bom == "\xFF\xFE") {
 928			return self::iconv_fallback_utf16le_iso88591(substr($string, 2));
 929		}
 930		return $string;
 931	}
 932
 933	// UTF-16 (BOM) => UTF-8
 934	public static function iconv_fallback_utf16_utf8($string) {
 935		$bom = substr($string, 0, 2);
 936		if ($bom == "\xFE\xFF") {
 937			return self::iconv_fallback_utf16be_utf8(substr($string, 2));
 938		} elseif ($bom == "\xFF\xFE") {
 939			return self::iconv_fallback_utf16le_utf8(substr($string, 2));
 940		}
 941		return $string;
 942	}
 943
 944	public static function iconv_fallback($in_charset, $out_charset, $string) {
 945
 946		if ($in_charset == $out_charset) {
 947			return $string;
 948		}
 949
 950		// iconv() availble
 951		if (function_exists('iconv')) {
 952			if ($converted_string = @iconv($in_charset, $out_charset.'//TRANSLIT', $string)) {
 953				switch ($out_charset) {
 954					case 'ISO-8859-1':
 955						$converted_string = rtrim($converted_string, "\x00");
 956						break;
 957				}
 958				return $converted_string;
 959			}
 960
 961			// iconv() may sometimes fail with "illegal character in input string" error message
 962			// and return an empty string, but returning the unconverted string is more useful
 963			return $string;
 964		}
 965
 966
 967		// iconv() not available
 968		static $ConversionFunctionList = array();
 969		if (empty($ConversionFunctionList)) {
 970			$ConversionFunctionList['ISO-8859-1']['UTF-8']    = 'iconv_fallback_iso88591_utf8';
 971			$ConversionFunctionList['ISO-8859-1']['UTF-16']   = 'iconv_fallback_iso88591_utf16';
 972			$ConversionFunctionList['ISO-8859-1']['UTF-16BE'] = 'iconv_fallback_iso88591_utf16be';
 973			$ConversionFunctionList['ISO-8859-1']['UTF-16LE'] = 'iconv_fallback_iso88591_utf16le';
 974			$ConversionFunctionList['UTF-8']['ISO-8859-1']    = 'iconv_fallback_utf8_iso88591';
 975			$ConversionFunctionList['UTF-8']['UTF-16']        = 'iconv_fallback_utf8_utf16';
 976			$ConversionFunctionList['UTF-8']['UTF-16BE']      = 'iconv_fallback_utf8_utf16be';
 977			$ConversionFunctionList['UTF-8']['UTF-16LE']      = 'iconv_fallback_utf8_utf16le';
 978			$ConversionFunctionList['UTF-16']['ISO-8859-1']   = 'iconv_fallback_utf16_iso88591';
 979			$ConversionFunctionList['UTF-16']['UTF-8']        = 'iconv_fallback_utf16_utf8';
 980			$ConversionFunctionList['UTF-16LE']['ISO-8859-1'] = 'iconv_fallback_utf16le_iso88591';
 981			$ConversionFunctionList['UTF-16LE']['UTF-8']      = 'iconv_fallback_utf16le_utf8';
 982			$ConversionFunctionList['UTF-16BE']['ISO-8859-1'] = 'iconv_fallback_utf16be_iso88591';
 983			$ConversionFunctionList['UTF-16BE']['UTF-8']      = 'iconv_fallback_utf16be_utf8';
 984		}
 985		if (isset($ConversionFunctionList[strtoupper($in_charset)][strtoupper($out_charset)])) {
 986			$ConversionFunction = $ConversionFunctionList[strtoupper($in_charset)][strtoupper($out_charset)];
 987			return self::$ConversionFunction($string);
 988		}
 989		throw new Exception('PHP does not have iconv() support - cannot convert from '.$in_charset.' to '.$out_charset);
 990	}
 991
 992	public static function recursiveMultiByteCharString2HTML($data, $charset='ISO-8859-1') {
 993		if (is_string($data)) {
 994			return self::MultiByteCharString2HTML($data, $charset);
 995		} elseif (is_array($data)) {
 996			$return_data = array();
 997			foreach ($data as $key => $value) {
 998				$return_data[$key] = self::recursiveMultiByteCharString2HTML($value, $charset);
 999			}
1000			return $return_data;
1001		}
1002		// integer, float, objects, resources, etc
1003		return $data;
1004	}
1005
1006	public static function MultiByteCharString2HTML($string, $charset='ISO-8859-1') {
1007		$string = (string) $string; // in case trying to pass a numeric (float, int) string, would otherwise return an empty string
1008		$HTMLstring = '';
1009
1010		switch ($charset) {
1011			case '1251':
1012			case '1252':
1013			case '866':
1014			case '932':
1015			case '936':
1016			case '950':
1017			case 'BIG5':
1018			case 'BIG5-HKSCS':
1019			case 'cp1251':
1020			case 'cp1252':
1021			case 'cp866':
1022			case 'EUC-JP':
1023			case 'EUCJP':
1024			case 'GB2312':
1025			case 'ibm866':
1026			case 'ISO-8859-1':
1027			case 'ISO-8859-15':
1028			case 'ISO8859-1':
1029			case 'ISO8859-15':
1030			case 'KOI8-R':
1031			case 'koi8-ru':
1032			case 'koi8r':
1033			case 'Shift_JIS':
1034			case 'SJIS':
1035			case 'win-1251':
1036			case 'Windows-1251':
1037			case 'Windows-1252':
1038				$HTMLstring = htmlentities($string, ENT_COMPAT, $charset);
1039				break;
1040
1041			case 'UTF-8':
1042				$strlen = strlen($string);
1043				for ($i = 0; $i < $strlen; $i++) {
1044					$char_ord_val = ord($string{$i});
1045					$charval = 0;
1046					if ($char_ord_val < 0x80) {
1047						$charval = $char_ord_val;
1048					} elseif ((($char_ord_val & 0xF0) >> 4) == 0x0F  &&  $i+3 < $strlen) {
1049						$charval  = (($char_ord_val & 0x07) << 18);
1050						$charval += ((ord($string{++$i}) & 0x3F) << 12);
1051						$charval += ((ord($string{++$i}) & 0x3F) << 6);
1052						$charval +=  (ord($string{++$i}) & 0x3F);
1053					} elseif ((($char_ord_val & 0xE0) >> 5) == 0x07  &&  $i+2 < $strlen) {
1054						$charval  = (($char_ord_val & 0x0F) << 12);
1055						$charval += ((ord($string{++$i}) & 0x3F) << 6);
1056						$charval +=  (ord($string{++$i}) & 0x3F);
1057					} elseif ((($char_ord_val & 0xC0) >> 6) == 0x03  &&  $i+1 < $strlen) {
1058						$charval  = (($char_ord_val & 0x1F) << 6);
1059						$charval += (ord($string{++$i}) & 0x3F);
1060					}
1061					if (($charval >= 32) && ($charval <= 127)) {
1062						$HTMLstring .= htmlentities(chr($charval));
1063					} else {
1064						$HTMLstring .= '&#'.$charval.';';
1065					}
1066				}
1067				break;
1068
1069			case 'UTF-16LE':
1070				for ($i = 0; $i < strlen($string); $i += 2) {
1071					$charval = self::LittleEndian2Int(substr($string, $i, 2));
1072					if (($charval >= 32) && ($charval <= 127)) {
1073						$HTMLstring .= chr($charval);
1074					} else {
1075						$HTMLstring .= '&#'.$charval.';';
1076					}
1077				}
1078				break;
1079
1080			case 'UTF-16BE':
1081				for ($i = 0; $i < strlen($string); $i += 2) {
1082					$charval = self::BigEndian2Int(substr($string, $i, 2));
1083					if (($charval >= 32) && ($charval <= 127)) {
1084						$HTMLstring .= chr($charval);
1085					} else {
1086						$HTMLstring .= '&#'.$charval.';';
1087					}
1088				}
1089				break;
1090
1091			default:
1092				$HTMLstring = 'ERROR: Character set "'.$charset.'" not supported in MultiByteCharString2HTML()';
1093				break;
1094		}
1095		return $HTMLstring;
1096	}
1097
1098
1099
1100	public static function RGADnameLookup($namecode) {
1101		static $RGADname = array();
1102		if (empty($RGADname)) {
1103			$RGADname[0] = 'not set';
1104			$RGADname[1] = 'Track Gain Adjustment';
1105			$RGADname[2] = 'Album Gain Adjustment';
1106		}
1107
1108		return (isset($RGADname[$namecode]) ? $RGADname[$namecode] : '');
1109	}
1110
1111
1112	public static function RGADoriginatorLookup($originatorcode) {
1113		static $RGADoriginator = array();
1114		if (empty($RGADoriginator)) {
1115			$RGADoriginator[0] = 'unspecified';
1116			$RGADoriginator[1] = 'pre-set by artist/producer/mastering engineer';
1117			$RGADoriginator[2] = 'set by user';
1118			$RGADoriginator[3] = 'determined automatically';
1119		}
1120
1121		return (isset($RGADoriginator[$originatorcode]) ? $RGADoriginator[$originatorcode] : '');
1122	}
1123
1124
1125	public static function RGADadjustmentLookup($rawadjustment, $signbit) {
1126		$adjustment = $rawadjustment / 10;
1127		if ($signbit == 1) {
1128			$adjustment *= -1;
1129		}
1130		return (float) $adjustment;
1131	}
1132
1133
1134	public static function RGADgainString($namecode, $originatorcode, $replaygain) {
1135		if ($replaygain < 0) {
1136			$signbit = '1';
1137		} else {
1138			$signbit = '0';
1139		}
1140		$storedreplaygain = intval(round($replaygain * 10));
1141		$gainstring  = str_pad(decbin($namecode), 3, '0', STR_PAD_LEFT);
1142		$gainstring .= str_pad(decbin($originatorcode), 3, '0', STR_PAD_LEFT);
1143		$gainstring .= $signbit;
1144		$gainstring .= str_pad(decbin($storedreplaygain), 9, '0', STR_PAD_LEFT);
1145
1146		return $gainstring;
1147	}
1148
1149	public static function RGADamplitude2dB($amplitude) {
1150		return 20 * log10($amplitude);
1151	}
1152
1153
1154	public static function GetDataImageSize($imgData, &$imageinfo=array()) {
1155		static $tempdir = '';
1156		if (empty($tempdir)) {
1157			// yes this is ugly, feel free to suggest a better way
1158			require_once(dirname(__FILE__).'/getid3.php');
1159			$getid3_temp = new getID3();
1160			$tempdir = $getid3_temp->tempdir;
1161			unset($getid3_temp);
1162		}
1163		$GetDataImageSize = false;
1164		if ($tempfilename = tempnam($tempdir, 'gI3')) {
1165			if (is_writable($tempfilename) && is_file($tempfilename) && ($tmp = fopen($tempfilename, 'wb'))) {
1166				fwrite($tmp, $imgData);
1167				fclose($tmp);
1168				$GetDataImageSize = @getimagesize($tempfilename, $imageinfo);
1169			}
1170			unlink($tempfilename);
1171		}
1172		return $GetDataImageSize;
1173	}
1174
1175	public static function ImageExtFromMime($mime_type) {
1176		// temporary way, works OK for now, but should be reworked in the future
1177		return str_replace(array('image/', 'x-', 'jpeg'), array('', '', 'jpg'), $mime_type);
1178	}
1179
1180	public static function ImageTypesLookup($imagetypeid) {
1181		static $ImageTypesLookup = array();
1182		if (empty($ImageTypesLookup)) {
1183			$ImageTypesLookup[1]  = 'gif';
1184			$ImageTypesLookup[2]  = 'jpeg';
1185			$ImageTypesLookup[3]  = 'png';
1186			$ImageTypesLookup[4]  = 'swf';
1187			$ImageTypesLookup[5]  = 'psd';
1188			$ImageTypesLookup[6]  = 'bmp';
1189			$ImageTypesLookup[7]  = 'tiff (little-endian)';
1190			$ImageTypesLookup[8]  = 'tiff (big-endian)';
1191			$ImageTypesLookup[9]  = 'jpc';
1192			$ImageTypesLookup[10] = 'jp2';
1193			$ImageTypesLookup[11] = 'jpx';
1194			$ImageTypesLookup[12] = 'jb2';
1195			$ImageTypesLookup[13] = 'swc';
1196			$ImageTypesLookup[14] = 'iff';
1197		}
1198		return (isset($ImageTypesLookup[$imagetypeid]) ? $ImageTypesLookup[$imagetypeid] : '');
1199	}
1200
1201	public static function CopyTagsToComments(&$ThisFileInfo) {
1202
1203		// Copy all entries from ['tags'] into common ['comments']
1204		if (!empty($ThisFileInfo['tags'])) {
1205			foreach ($ThisFileInfo['tags'] as $tagtype => $tagarray) {
1206				foreach ($tagarray as $tagname => $tagdata) {
1207					foreach ($tagdata as $key => $value) {
1208						if (!empty($value)) {
1209							if (empty($ThisFileInfo['comments'][$tagname])) {
1210
1211								// fall through and append value
1212
1213							} elseif ($tagtype == 'id3v1') {
1214
1215								$newvaluelength = strlen(trim($value));
1216								foreach ($ThisFileInfo['comments'][$tagname] as $existingkey => $existingvalue) {
1217									$oldvaluelength = strlen(trim($existingvalue));
1218									if (($newvaluelength <= $oldvaluelength) && (substr($existingvalue, 0, $newvaluelength) == trim($value))) {
1219										// new value is identical but shorter-than (or equal-length to) one already in comments - skip
1220										break 2;
1221									}
1222								}
1223
1224							} elseif (!is_array($value)) {
1225
1226								$newvaluelength = strlen(trim($value));
1227								foreach ($ThisFileInfo['comments'][$tagname] as $existingkey => $existingvalue) {
1228									$oldvaluelength = strlen(trim($existingvalue));
1229									if ((strlen($existingvalue) > 10) && ($newvaluelength > $oldvaluelength) && (substr(trim($value), 0, strlen($existingvalue)) == $existingvalue)) {
1230										$ThisFileInfo['comments'][$tagname][$existingkey] = trim($value);
1231										//break 2;
1232										break;
1233									}
1234								}
1235
1236							}
1237							if (is_array($value) || empty($ThisFileInfo['comments'][$tagname]) || !in_array(trim($value), $ThisFileInfo['comments'][$tagname])) {
1238								$value = (is_string($value) ? trim($value) : $value);
1239								if (!is_numeric($key)) {
1240									$ThisFileInfo['comments'][$tagname][$key] = $value;
1241								} else {
1242									$ThisFileInfo['comments'][$tagname][]     = $value;
1243								}
1244							}
1245						}
1246					}
1247				}
1248			}
1249
1250			// Copy to ['comments_html']
1251			if (!empty($ThisFileInfo['comments'])) {
1252				foreach ($ThisFileInfo['comments'] as $field => $values) {
1253					if ($field == 'picture') {
1254						// pictures can take up a lot of space, and we don't need multiple copies of them
1255						// let there be a single copy in [comments][picture], and not elsewhere
1256						continue;
1257					}
1258					foreach ($values as $index => $value) {
1259						if (is_array($value)) {
1260							$ThisFileInfo['comments_html'][$field][$index] = $value;
1261						} else {
1262							$ThisFileInfo['comments_html'][$field][$index] = str_replace('&#0;', '', self::MultiByteCharString2HTML($value, $ThisFileInfo['encoding']));
1263						}
1264					}
1265				}
1266			}
1267
1268		}
1269		return true;
1270	}
1271
1272
1273	public static function EmbeddedLookup($key, $begin, $end, $file, $name) {
1274
1275		// Cached
1276		static $cache;
1277		if (isset($cache[$file][$name])) {
1278			return (isset($cache[$file][$name][$key]) ? $cache[$file][$name][$key] : '');
1279		}
1280
1281		// Init
1282		$keylength  = strlen($key);
1283		$line_count = $end - $begin - 7;
1284
1285		// Open php file
1286		$fp = fopen($file, 'r');
1287
1288		// Discard $begin lines
1289		for ($i = 0; $i < ($begin + 3); $i++) {
1290			fgets($fp, 1024);
1291		}
1292
1293		// Loop thru line
1294		while (0 < $line_count--) {
1295
1296			// Read line
1297			$line = ltrim(fgets($fp, 1024), "\t ");
1298
1299			// METHOD A: only cache the matching key - less memory but slower on next lookup of not-previously-looked-up key
1300			//$keycheck = substr($line, 0, $keylength);
1301			//if ($key == $keycheck)  {
1302			//	$cache[$file][$name][$keycheck] = substr($line, $keylength + 1);
1303			//	break;
1304			//}
1305
1306			// METHOD B: cache all keys in this lookup - more memory but faster on next lookup of not-previously-looked-up key
1307			//$cache[$file][$name][substr($line, 0, $keylength)] = trim(substr($line, $keylength + 1));
1308			$explodedLine = explode("\t", $line, 2);
1309			$ThisKey   = (isset($explodedLine[0]) ? $explodedLine[0] : '');
1310			$ThisValue = (isset($explodedLine[1]) ? $explodedLine[1] : '');
1311			$cache[$file][$name][$ThisKey] = trim($ThisValue);
1312		}
1313
1314		// Close and return
1315		fclose($fp);
1316		return (isset($cache[$file][$name][$key]) ? $cache[$file][$name][$key] : '');
1317	}
1318
1319	public static function IncludeDependency($filename, $sourcefile, $DieOnFailure=false) {
1320		global $GETID3_ERRORARRAY;
1321
1322		if (file_exists($filename)) {
1323			if (include_once($filename)) {
1324				return true;
1325			} else {
1326				$diemessage = basename($sourcefile).' depends on '.$filename.', which has errors';
1327			}
1328		} else {
1329			$diemessage = basename($sourcefile).' depends on '.$filename.', which is missing';
1330		}
1331		if ($DieOnFailure) {
1332			throw new Exception($diemessage);
1333		} else {
1334			$GETID3_ERRORARRAY[] = $diemessage;
1335		}
1336		return false;
1337	}
1338
1339	public static function trimNullByte($string) {
1340		return trim($string, "\x00");
1341	}
1342
1343	public static function getFileSizeSyscall($path) {
1344		$filesize = false;
1345
1346		if (GETID3_OS_ISWINDOWS) {
1347			if (class_exists('COM')) { // From PHP 5.3.15 and 5.4.5, COM and DOTNET is no longer built into the php core.you have to add COM support in php.ini:
1348				$filesystem = new COM('Scripting.FileSystemObject');
1349				$file = $filesystem->GetFile($path);
1350				$filesize = $file->Size();
1351				unset($filesystem, $file);
1352			} else {
1353				$commandline = 'for %I in ('.escapeshellarg($path).') do @echo %~zI';
1354			}
1355		} else {
1356			$commandline = 'ls -l '.escapeshellarg($path).' | awk \'{print $5}\'';
1357		}
1358		if (isset($commandline)) {
1359			$output = trim(`$commandline`);
1360			if (ctype_digit($output)) {
1361				$filesize = (float) $output;
1362			}
1363		}
1364		return $filesize;
1365	}
1366
1367
1368	/**
1369	* Workaround for Bug #37268 (https://bugs.php.net/bug.php?id=37268)
1370	* @param string $path A path.
1371	* @param string $suffix If the name component ends in suffix this will also be cut off.
1372	* @return string
1373	*/
1374	public static function mb_basename($path, $suffix = null) {
1375		$splited = preg_split('#/#', rtrim($path, '/ '));
1376		return substr(basename('X'.$splited[count($splited) - 1], $suffix), 1);
1377	}
1378
1379}