<?php
  /////////////////////////////////////////////////////////////////
  /// getID3() by James Heinrich <info@getid3.org>               //
  //  available at http://getid3.sourceforge.net                 //
  //            or http://www.getid3.org                         //
  /////////////////////////////////////////////////////////////////
  //                                                             //
  // getid3.lib.php - part of getID3()                           //
  // See readme.txt for more details                             //
  //                                                            ///
  /////////////////////////////////////////////////////////////////
  
  
  class getid3_lib
  {

  	public static function PrintHexBytes($string, $hex=true, $spaces=true, $htmlencoding='UTF-8') {

  		$returnstring = '';
  		for ($i = 0; $i < strlen($string); $i++) {
  			if ($hex) {
  				$returnstring .= str_pad(dechex(ord($string{$i})), 2, '0', STR_PAD_LEFT);
  			} else {
  				$returnstring .= ' '.(preg_match("#[\x20-\x7E]#", $string{$i}) ? $string{$i} : '¤');
  			}
  			if ($spaces) {
  				$returnstring .= ' ';
  			}
  		}
  		if (!empty($htmlencoding)) {
  			if ($htmlencoding === true) {
  				$htmlencoding = 'UTF-8'; // prior to getID3 v1.9.0 the function's 4th parameter was boolean
  			}
  			$returnstring = htmlentities($returnstring, ENT_QUOTES, $htmlencoding);
  		}
  		return $returnstring;
  	}

  	public static function trunc($floatnumber) {

  		// truncates a floating-point number at the decimal point
  		// returns int (if possible, otherwise float)
  		if ($floatnumber >= 1) {
  			$truncatednumber = floor($floatnumber);
  		} elseif ($floatnumber <= -1) {
  			$truncatednumber = ceil($floatnumber);
  		} else {
  			$truncatednumber = 0;
  		}

  		if (self::intValueSupported($truncatednumber)) {

  			$truncatednumber = (int) $truncatednumber;
  		}
  		return $truncatednumber;
  	}

  	public static function safe_inc(&$variable, $increment=1) {

  		if (isset($variable)) {
  			$variable += $increment;
  		} else {
  			$variable = $increment;
  		}
  		return true;
  	}

  	public static function CastAsInt($floatnum) {

  		// convert to float if not already
  		$floatnum = (float) $floatnum;
  
  		// convert a float to type int, only if possible

  		if (self::trunc($floatnum) == $floatnum) {

  			// it's not floating point

  			if (self::intValueSupported($floatnum)) {

  				// it's within int range
  				$floatnum = (int) $floatnum;
  			}
  		}
  		return $floatnum;
  	}
  
  	public static function intValueSupported($num) {
  		// check if integers are 64-bit
  		static $hasINT64 = null;
  		if ($hasINT64 === null) { // 10x faster than is_null()
  			$hasINT64 = is_int(pow(2, 31)); // 32-bit int are limited to (2^31)-1
  			if (!$hasINT64 && !defined('PHP_INT_MIN')) {
  				define('PHP_INT_MIN', ~PHP_INT_MAX);
  			}
  		}
  		// if integers are 64-bit - no other check required
  		if ($hasINT64 || (($num <= PHP_INT_MAX) && ($num >= PHP_INT_MIN))) {
  			return true;
  		}
  		return false;
  	}

  	public static function DecimalizeFraction($fraction) {

  		list($numerator, $denominator) = explode('/', $fraction);
  		return $numerator / ($denominator ? $denominator : 1);
  	}

  	public static function DecimalBinary2Float($binarynumerator) {
  		$numerator   = self::Bin2Dec($binarynumerator);
  		$denominator = self::Bin2Dec('1'.str_repeat('0', strlen($binarynumerator)));

  		return ($numerator / $denominator);
  	}

  	public static function NormalizeBinaryPoint($binarypointnumber, $maxbits=52) {

  		// http://www.scri.fsu.edu/~jac/MAD3401/Backgrnd/binary.html
  		if (strpos($binarypointnumber, '.') === false) {
  			$binarypointnumber = '0.'.$binarypointnumber;
  		} elseif ($binarypointnumber{0} == '.') {
  			$binarypointnumber = '0'.$binarypointnumber;
  		}
  		$exponent = 0;
  		while (($binarypointnumber{0} != '1') || (substr($binarypointnumber, 1, 1) != '.')) {
  			if (substr($binarypointnumber, 1, 1) == '.') {
  				$exponent--;
  				$binarypointnumber = substr($binarypointnumber, 2, 1).'.'.substr($binarypointnumber, 3);
  			} else {
  				$pointpos = strpos($binarypointnumber, '.');
  				$exponent += ($pointpos - 1);
  				$binarypointnumber = str_replace('.', '', $binarypointnumber);
  				$binarypointnumber = $binarypointnumber{0}.'.'.substr($binarypointnumber, 1);
  			}
  		}
  		$binarypointnumber = str_pad(substr($binarypointnumber, 0, $maxbits + 2), $maxbits + 2, '0', STR_PAD_RIGHT);
  		return array('normalized'=>$binarypointnumber, 'exponent'=>(int) $exponent);
  	}

  	public static function Float2BinaryDecimal($floatvalue) {

  		// http://www.scri.fsu.edu/~jac/MAD3401/Backgrnd/binary.html
  		$maxbits = 128; // to how many bits of precision should the calculations be taken?

  		$intpart   = self::trunc($floatvalue);

  		$floatpart = abs($floatvalue - $intpart);
  		$pointbitstring = '';
  		while (($floatpart != 0) && (strlen($pointbitstring) < $maxbits)) {
  			$floatpart *= 2;

  			$pointbitstring .= (string) self::trunc($floatpart);
  			$floatpart -= self::trunc($floatpart);

  		}
  		$binarypointnumber = decbin($intpart).'.'.$pointbitstring;
  		return $binarypointnumber;
  	}

  	public static function Float2String($floatvalue, $bits) {

  		// http://www.scri.fsu.edu/~jac/MAD3401/Backgrnd/ieee-expl.html
  		switch ($bits) {
  			case 32:
  				$exponentbits = 8;
  				$fractionbits = 23;
  				break;
  
  			case 64:
  				$exponentbits = 11;
  				$fractionbits = 52;
  				break;
  
  			default:
  				return false;
  				break;
  		}
  		if ($floatvalue >= 0) {
  			$signbit = '0';
  		} else {
  			$signbit = '1';
  		}

  		$normalizedbinary  = self::NormalizeBinaryPoint(self::Float2BinaryDecimal($floatvalue), $fractionbits);

  		$biasedexponent    = pow(2, $exponentbits - 1) - 1 + $normalizedbinary['exponent']; // (127 or 1023) +/- exponent
  		$exponentbitstring = str_pad(decbin($biasedexponent), $exponentbits, '0', STR_PAD_LEFT);
  		$fractionbitstring = str_pad(substr($normalizedbinary['normalized'], 2), $fractionbits, '0', STR_PAD_RIGHT);

  		return self::BigEndian2String(self::Bin2Dec($signbit.$exponentbitstring.$fractionbitstring), $bits % 8, false);

  	}

  	public static function LittleEndian2Float($byteword) {
  		return self::BigEndian2Float(strrev($byteword));

  	}

  	public static function BigEndian2Float($byteword) {

  		// ANSI/IEEE Standard 754-1985, Standard for Binary Floating Point Arithmetic
  		// http://www.psc.edu/general/software/packages/ieee/ieee.html
  		// http://www.scri.fsu.edu/~jac/MAD3401/Backgrnd/ieee.html

  		$bitword = self::BigEndian2Bin($byteword);

  		if (!$bitword) {
  			return 0;
  		}
  		$signbit = $bitword{0};
  
  		switch (strlen($byteword) * 8) {
  			case 32:
  				$exponentbits = 8;
  				$fractionbits = 23;
  				break;
  
  			case 64:
  				$exponentbits = 11;
  				$fractionbits = 52;
  				break;
  
  			case 80:
  				// 80-bit Apple SANE format
  				// http://www.mactech.com/articles/mactech/Vol.06/06.01/SANENormalized/
  				$exponentstring = substr($bitword, 1, 15);
  				$isnormalized = intval($bitword{16});
  				$fractionstring = substr($bitword, 17, 63);

  				$exponent = pow(2, self::Bin2Dec($exponentstring) - 16383);
  				$fraction = $isnormalized + self::DecimalBinary2Float($fractionstring);

  				$floatvalue = $exponent * $fraction;
  				if ($signbit == '1') {
  					$floatvalue *= -1;
  				}
  				return $floatvalue;
  				break;
  
  			default:
  				return false;
  				break;
  		}
  		$exponentstring = substr($bitword, 1, $exponentbits);
  		$fractionstring = substr($bitword, $exponentbits + 1, $fractionbits);

  		$exponent = self::Bin2Dec($exponentstring);
  		$fraction = self::Bin2Dec($fractionstring);

  
  		if (($exponent == (pow(2, $exponentbits) - 1)) && ($fraction != 0)) {
  			// Not a Number
  			$floatvalue = false;
  		} elseif (($exponent == (pow(2, $exponentbits) - 1)) && ($fraction == 0)) {
  			if ($signbit == '1') {
  				$floatvalue = '-infinity';
  			} else {
  				$floatvalue = '+infinity';
  			}
  		} elseif (($exponent == 0) && ($fraction == 0)) {
  			if ($signbit == '1') {
  				$floatvalue = -0;
  			} else {
  				$floatvalue = 0;
  			}
  			$floatvalue = ($signbit ? 0 : -0);
  		} elseif (($exponent == 0) && ($fraction != 0)) {
  			// These are 'unnormalized' values

  			$floatvalue = pow(2, (-1 * (pow(2, $exponentbits - 1) - 2))) * self::DecimalBinary2Float($fractionstring);

  			if ($signbit == '1') {
  				$floatvalue *= -1;
  			}
  		} elseif ($exponent != 0) {

  			$floatvalue = pow(2, ($exponent - (pow(2, $exponentbits - 1) - 1))) * (1 + self::DecimalBinary2Float($fractionstring));

  			if ($signbit == '1') {
  				$floatvalue *= -1;
  			}
  		}
  		return (float) $floatvalue;
  	}

  	public static function BigEndian2Int($byteword, $synchsafe=false, $signed=false) {

  		$intvalue = 0;
  		$bytewordlen = strlen($byteword);
  		if ($bytewordlen == 0) {
  			return false;
  		}
  		for ($i = 0; $i < $bytewordlen; $i++) {
  			if ($synchsafe) { // disregard MSB, effectively 7-bit bytes
  				//$intvalue = $intvalue | (ord($byteword{$i}) & 0x7F) << (($bytewordlen - 1 - $i) * 7); // faster, but runs into problems past 2^31 on 32-bit systems
  				$intvalue += (ord($byteword{$i}) & 0x7F) * pow(2, ($bytewordlen - 1 - $i) * 7);
  			} else {
  				$intvalue += ord($byteword{$i}) * pow(256, ($bytewordlen - 1 - $i));
  			}
  		}
  		if ($signed && !$synchsafe) {
  			// synchsafe ints are not allowed to be signed
  			if ($bytewordlen <= PHP_INT_SIZE) {
  				$signMaskBit = 0x80 << (8 * ($bytewordlen - 1));
  				if ($intvalue & $signMaskBit) {
  					$intvalue = 0 - ($intvalue & ($signMaskBit - 1));
  				}
  			} else {

  				throw new Exception('ERROR: Cannot have signed integers larger than '.(8 * PHP_INT_SIZE).'-bits ('.strlen($byteword).') in self::BigEndian2Int()');

  				break;
  			}
  		}

  		return self::CastAsInt($intvalue);

  	}

  	public static function LittleEndian2Int($byteword, $signed=false) {
  		return self::BigEndian2Int(strrev($byteword), false, $signed);

  	}

  	public static function BigEndian2Bin($byteword) {

  		$binvalue = '';
  		$bytewordlen = strlen($byteword);
  		for ($i = 0; $i < $bytewordlen; $i++) {
  			$binvalue .= str_pad(decbin(ord($byteword{$i})), 8, '0', STR_PAD_LEFT);
  		}
  		return $binvalue;
  	}

  	public static function BigEndian2String($number, $minbytes=1, $synchsafe=false, $signed=false) {

  		if ($number < 0) {

  			throw new Exception('ERROR: self::BigEndian2String() does not support negative numbers');

  		}
  		$maskbyte = (($synchsafe || $signed) ? 0x7F : 0xFF);
  		$intstring = '';
  		if ($signed) {
  			if ($minbytes > PHP_INT_SIZE) {

  				throw new Exception('ERROR: Cannot have signed integers larger than '.(8 * PHP_INT_SIZE).'-bits in self::BigEndian2String()');

  			}
  			$number = $number & (0x80 << (8 * ($minbytes - 1)));
  		}
  		while ($number != 0) {
  			$quotient = ($number / ($maskbyte + 1));
  			$intstring = chr(ceil(($quotient - floor($quotient)) * $maskbyte)).$intstring;
  			$number = floor($quotient);
  		}
  		return str_pad($intstring, $minbytes, "\x00", STR_PAD_LEFT);
  	}

  	public static function Dec2Bin($number) {

  		while ($number >= 256) {
  			$bytes[] = (($number / 256) - (floor($number / 256))) * 256;
  			$number = floor($number / 256);
  		}
  		$bytes[] = $number;
  		$binstring = '';
  		for ($i = 0; $i < count($bytes); $i++) {
  			$binstring = (($i == count($bytes) - 1) ? decbin($bytes[$i]) : str_pad(decbin($bytes[$i]), 8, '0', STR_PAD_LEFT)).$binstring;
  		}
  		return $binstring;
  	}

  	public static function Bin2Dec($binstring, $signed=false) {

  		$signmult = 1;
  		if ($signed) {
  			if ($binstring{0} == '1') {
  				$signmult = -1;
  			}
  			$binstring = substr($binstring, 1);
  		}
  		$decvalue = 0;
  		for ($i = 0; $i < strlen($binstring); $i++) {
  			$decvalue += ((int) substr($binstring, strlen($binstring) - $i - 1, 1)) * pow(2, $i);
  		}

  		return self::CastAsInt($decvalue * $signmult);

  	}

  	public static function Bin2String($binstring) {

  		// return 'hi' for input of '0110100001101001'
  		$string = '';
  		$binstringreversed = strrev($binstring);
  		for ($i = 0; $i < strlen($binstringreversed); $i += 8) {

  			$string = chr(self::Bin2Dec(strrev(substr($binstringreversed, $i, 8)))).$string;

  		}
  		return $string;
  	}

  	public static function LittleEndian2String($number, $minbytes=1, $synchsafe=false) {

  		$intstring = '';
  		while ($number > 0) {
  			if ($synchsafe) {
  				$intstring = $intstring.chr($number & 127);
  				$number >>= 7;
  			} else {
  				$intstring = $intstring.chr($number & 255);
  				$number >>= 8;
  			}
  		}
  		return str_pad($intstring, $minbytes, "\x00", STR_PAD_RIGHT);
  	}

  	public static function array_merge_clobber($array1, $array2) {

  		// written by kcŘhireability*com
  		// taken from http://www.php.net/manual/en/function.array-merge-recursive.php
  		if (!is_array($array1) || !is_array($array2)) {
  			return false;
  		}
  		$newarray = $array1;
  		foreach ($array2 as $key => $val) {
  			if (is_array($val) && isset($newarray[$key]) && is_array($newarray[$key])) {

  				$newarray[$key] = self::array_merge_clobber($newarray[$key], $val);

  			} else {
  				$newarray[$key] = $val;
  			}
  		}
  		return $newarray;
  	}

  	public static function array_merge_noclobber($array1, $array2) {

  		if (!is_array($array1) || !is_array($array2)) {
  			return false;
  		}
  		$newarray = $array1;
  		foreach ($array2 as $key => $val) {
  			if (is_array($val) && isset($newarray[$key]) && is_array($newarray[$key])) {

  				$newarray[$key] = self::array_merge_noclobber($newarray[$key], $val);

  			} elseif (!isset($newarray[$key])) {
  				$newarray[$key] = $val;
  			}
  		}
  		return $newarray;
  	}

  	public static function ksort_recursive(&$theArray) {

  		ksort($theArray);
  		foreach ($theArray as $key => $value) {
  			if (is_array($value)) {
  				self::ksort_recursive($theArray[$key]);
  			}
  		}
  		return true;
  	}

  	public static function fileextension($filename, $numextensions=1) {

  		if (strstr($filename, '.')) {
  			$reversedfilename = strrev($filename);
  			$offset = 0;
  			for ($i = 0; $i < $numextensions; $i++) {
  				$offset = strpos($reversedfilename, '.', $offset + 1);
  				if ($offset === false) {
  					return '';
  				}
  			}
  			return strrev(substr($reversedfilename, 0, $offset));
  		}
  		return '';
  	}

  	public static function PlaytimeString($seconds) {

  		$sign = (($seconds < 0) ? '-' : '');

  		$seconds = round(abs($seconds));
  		$H = (int) floor( $seconds                            / 3600);
  		$M = (int) floor(($seconds - (3600 * $H)            ) /   60);
  		$S = (int) round( $seconds - (3600 * $H) - (60 * $M)        );

  		return $sign.($H ? $H.':' : '').($H ? str_pad($M, 2, '0', STR_PAD_LEFT) : intval($M)).':'.str_pad($S, 2, 0, STR_PAD_LEFT);
  	}

  	public static function DateMac2Unix($macdate) {

  		// Macintosh timestamp: seconds since 00:00h January 1, 1904
  		// UNIX timestamp:      seconds since 00:00h January 1, 1970

  		return self::CastAsInt($macdate - 2082844800);

  	}

  	public static function FixedPoint8_8($rawdata) {
  		return self::BigEndian2Int(substr($rawdata, 0, 1)) + (float) (self::BigEndian2Int(substr($rawdata, 1, 1)) / pow(2, 8));

  	}

  	public static function FixedPoint16_16($rawdata) {
  		return self::BigEndian2Int(substr($rawdata, 0, 2)) + (float) (self::BigEndian2Int(substr($rawdata, 2, 2)) / pow(2, 16));

  	}

  	public static function FixedPoint2_30($rawdata) {
  		$binarystring = self::BigEndian2Bin($rawdata);
  		return self::Bin2Dec(substr($binarystring, 0, 2)) + (float) (self::Bin2Dec(substr($binarystring, 2, 30)) / pow(2, 30));

  	}

  	public static function CreateDeepArray($ArrayPath, $Separator, $Value) {

  		// assigns $Value to a nested array path:

  		//   $foo = self::CreateDeepArray('/path/to/my', '/', 'file.txt')

  		// is the same as:
  		//   $foo = array('path'=>array('to'=>'array('my'=>array('file.txt'))));
  		// or
  		//   $foo['path']['to']['my'] = 'file.txt';

  		$ArrayPath = ltrim($ArrayPath, $Separator);

  		if (($pos = strpos($ArrayPath, $Separator)) !== false) {

  			$ReturnedArray[substr($ArrayPath, 0, $pos)] = self::CreateDeepArray(substr($ArrayPath, $pos + 1), $Separator, $Value);

  		} else {
  			$ReturnedArray[$ArrayPath] = $Value;
  		}
  		return $ReturnedArray;
  	}

  	public static function array_max($arraydata, $returnkey=false) {

  		$maxvalue = false;
  		$maxkey = false;
  		foreach ($arraydata as $key => $value) {
  			if (!is_array($value)) {
  				if ($value > $maxvalue) {
  					$maxvalue = $value;
  					$maxkey = $key;
  				}
  			}
  		}
  		return ($returnkey ? $maxkey : $maxvalue);
  	}

  	public static function array_min($arraydata, $returnkey=false) {

  		$minvalue = false;
  		$minkey = false;
  		foreach ($arraydata as $key => $value) {
  			if (!is_array($value)) {
  				if ($value > $minvalue) {
  					$minvalue = $value;
  					$minkey = $key;
  				}
  			}
  		}
  		return ($returnkey ? $minkey : $minvalue);
  	}

  	public static function XML2array($XMLstring) {

  		if (function_exists('simplexml_load_string')) {
  			if (function_exists('get_object_vars')) {
  				$XMLobject = simplexml_load_string($XMLstring);
  				return self::SimpleXMLelement2array($XMLobject);
  			}
  		}
  		return false;
  	}

  	public static function SimpleXMLelement2array($XMLobject) {

  		if (!is_object($XMLobject) && !is_array($XMLobject)) {
  			return $XMLobject;
  		}
  		$XMLarray = (is_object($XMLobject) ? get_object_vars($XMLobject) : $XMLobject);
  		foreach ($XMLarray as $key => $value) {
  			$XMLarray[$key] = self::SimpleXMLelement2array($value);
  		}
  		return $XMLarray;
  	}
  
  
  	// Allan Hansen <ahŘartemis*dk>

  	// self::md5_data() - returns md5sum for a file from startuing position to absolute end position
  	public static function hash_data($file, $offset, $end, $algorithm) {

  		static $tempdir = '';

  		if (!self::intValueSupported($end)) {

  			return false;
  		}
  		switch ($algorithm) {
  			case 'md5':
  				$hash_function = 'md5_file';
  				$unix_call     = 'md5sum';
  				$windows_call  = 'md5sum.exe';
  				$hash_length   = 32;
  				break;
  
  			case 'sha1':
  				$hash_function = 'sha1_file';
  				$unix_call     = 'sha1sum';
  				$windows_call  = 'sha1sum.exe';
  				$hash_length   = 40;
  				break;
  
  			default:

  				throw new Exception('Invalid algorithm ('.$algorithm.') in self::hash_data()');

  				break;
  		}
  		$size = $end - $offset;
  		while (true) {
  			if (GETID3_OS_ISWINDOWS) {
  
  				// It seems that sha1sum.exe for Windows only works on physical files, does not accept piped data
  				// Fall back to create-temp-file method:
  				if ($algorithm == 'sha1') {
  					break;
  				}
  
  				$RequiredFiles = array('cygwin1.dll', 'head.exe', 'tail.exe', $windows_call);
  				foreach ($RequiredFiles as $required_file) {
  					if (!is_readable(GETID3_HELPERAPPSDIR.$required_file)) {
  						// helper apps not available - fall back to old method

  						break 2;

  					}
  				}

  				$commandline  = GETID3_HELPERAPPSDIR.'head.exe -c '.$end.' '.escapeshellarg(str_replace('/', DIRECTORY_SEPARATOR, $file)).' | ';

  				$commandline .= GETID3_HELPERAPPSDIR.'tail.exe -c '.$size.' | ';
  				$commandline .= GETID3_HELPERAPPSDIR.$windows_call;
  
  			} else {
  
  				$commandline  = 'head -c'.$end.' '.escapeshellarg($file).' | ';
  				$commandline .= 'tail -c'.$size.' | ';
  				$commandline .= $unix_call;
  
  			}
  			if (preg_match('#(1|ON)#i', ini_get('safe_mode'))) {
  				//throw new Exception('PHP running in Safe Mode - backtick operator not available, using slower non-system-call '.$algorithm.' algorithm');
  				break;
  			}
  			return substr(`$commandline`, 0, $hash_length);
  		}
  
  		if (empty($tempdir)) {
  			// yes this is ugly, feel free to suggest a better way
  			require_once(dirname(__FILE__).'/getid3.php');
  			$getid3_temp = new getID3();
  			$tempdir = $getid3_temp->tempdir;
  			unset($getid3_temp);
  		}
  		// try to create a temporary file in the system temp directory - invalid dirname should force to system temp dir
  		if (($data_filename = tempnam($tempdir, 'gI3')) === false) {
  			// can't find anywhere to create a temp file, just fail
  			return false;
  		}
  
  		// Init
  		$result = false;
  
  		// copy parts of file
  		try {

  			self::CopyFileParts($file, $data_filename, $offset, $end - $offset);

  			$result = $hash_function($data_filename);
  		} catch (Exception $e) {

  			throw new Exception('self::CopyFileParts() failed in getid_lib::hash_data(): '.$e->getMessage());

  		}
  		unlink($data_filename);
  		return $result;
  	}

  	public static function CopyFileParts($filename_source, $filename_dest, $offset, $length) {
  		if (!self::intValueSupported($offset + $length)) {

  			throw new Exception('cannot copy file portion, it extends beyond the '.round(PHP_INT_MAX / 1073741824).'GB limit');
  		}
  		if (is_readable($filename_source) && is_file($filename_source) && ($fp_src = fopen($filename_source, 'rb'))) {
  			if (($fp_dest = fopen($filename_dest, 'wb'))) {
  				if (fseek($fp_src, $offset, SEEK_SET) == 0) {
  					$byteslefttowrite = $length;
  					while (($byteslefttowrite > 0) && ($buffer = fread($fp_src, min($byteslefttowrite, getID3::FREAD_BUFFER_SIZE)))) {
  						$byteswritten = fwrite($fp_dest, $buffer, $byteslefttowrite);
  						$byteslefttowrite -= $byteswritten;
  					}
  					return true;
  				} else {
  					throw new Exception('failed to seek to offset '.$offset.' in '.$filename_source);
  				}
  				fclose($fp_dest);
  			} else {
  				throw new Exception('failed to create file for writing '.$filename_dest);
  			}
  			fclose($fp_src);
  		} else {
  			throw new Exception('failed to open file for reading '.$filename_source);
  		}
  		return false;
  	}

  	public static function iconv_fallback_int_utf8($charval) {

  		if ($charval < 128) {
  			// 0bbbbbbb
  			$newcharstring = chr($charval);
  		} elseif ($charval < 2048) {
  			// 110bbbbb 10bbbbbb
  			$newcharstring  = chr(($charval >>   6) | 0xC0);
  			$newcharstring .= chr(($charval & 0x3F) | 0x80);
  		} elseif ($charval < 65536) {
  			// 1110bbbb 10bbbbbb 10bbbbbb
  			$newcharstring  = chr(($charval >>  12) | 0xE0);
  			$newcharstring .= chr(($charval >>   6) | 0xC0);
  			$newcharstring .= chr(($charval & 0x3F) | 0x80);
  		} else {
  			// 11110bbb 10bbbbbb 10bbbbbb 10bbbbbb
  			$newcharstring  = chr(($charval >>  18) | 0xF0);
  			$newcharstring .= chr(($charval >>  12) | 0xC0);
  			$newcharstring .= chr(($charval >>   6) | 0xC0);
  			$newcharstring .= chr(($charval & 0x3F) | 0x80);
  		}
  		return $newcharstring;
  	}
  
  	// ISO-8859-1 => UTF-8

  	public static function iconv_fallback_iso88591_utf8($string, $bom=false) {

  		if (function_exists('utf8_encode')) {
  			return utf8_encode($string);
  		}
  		// utf8_encode() unavailable, use getID3()'s iconv_fallback() conversions (possibly PHP is compiled without XML support)
  		$newcharstring = '';
  		if ($bom) {
  			$newcharstring .= "\xEF\xBB\xBF";
  		}
  		for ($i = 0; $i < strlen($string); $i++) {
  			$charval = ord($string{$i});

  			$newcharstring .= self::iconv_fallback_int_utf8($charval);

  		}
  		return $newcharstring;
  	}
  
  	// ISO-8859-1 => UTF-16BE

  	public static function iconv_fallback_iso88591_utf16be($string, $bom=false) {

  		$newcharstring = '';
  		if ($bom) {
  			$newcharstring .= "\xFE\xFF";
  		}
  		for ($i = 0; $i < strlen($string); $i++) {
  			$newcharstring .= "\x00".$string{$i};
  		}
  		return $newcharstring;
  	}
  
  	// ISO-8859-1 => UTF-16LE

  	public static function iconv_fallback_iso88591_utf16le($string, $bom=false) {

  		$newcharstring = '';
  		if ($bom) {
  			$newcharstring .= "\xFF\xFE";
  		}
  		for ($i = 0; $i < strlen($string); $i++) {
  			$newcharstring .= $string{$i}."\x00";
  		}
  		return $newcharstring;
  	}
  
  	// ISO-8859-1 => UTF-16LE (BOM)

  	public static function iconv_fallback_iso88591_utf16($string) {
  		return self::iconv_fallback_iso88591_utf16le($string, true);

  	}
  
  	// UTF-8 => ISO-8859-1

  	public static function iconv_fallback_utf8_iso88591($string) {

  		if (function_exists('utf8_decode')) {
  			return utf8_decode($string);
  		}
  		// utf8_decode() unavailable, use getID3()'s iconv_fallback() conversions (possibly PHP is compiled without XML support)
  		$newcharstring = '';
  		$offset = 0;
  		$stringlength = strlen($string);
  		while ($offset < $stringlength) {
  			if ((ord($string{$offset}) | 0x07) == 0xF7) {
  				// 11110bbb 10bbbbbb 10bbbbbb 10bbbbbb
  				$charval = ((ord($string{($offset + 0)}) & 0x07) << 18) &
  						   ((ord($string{($offset + 1)}) & 0x3F) << 12) &
  						   ((ord($string{($offset + 2)}) & 0x3F) <<  6) &
  							(ord($string{($offset + 3)}) & 0x3F);
  				$offset += 4;
  			} elseif ((ord($string{$offset}) | 0x0F) == 0xEF) {
  				// 1110bbbb 10bbbbbb 10bbbbbb
  				$charval = ((ord($string{($offset + 0)}) & 0x0F) << 12) &
  						   ((ord($string{($offset + 1)}) & 0x3F) <<  6) &
  							(ord($string{($offset + 2)}) & 0x3F);
  				$offset += 3;
  			} elseif ((ord($string{$offset}) | 0x1F) == 0xDF) {
  				// 110bbbbb 10bbbbbb
  				$charval = ((ord($string{($offset + 0)}) & 0x1F) <<  6) &
  							(ord($string{($offset + 1)}) & 0x3F);
  				$offset += 2;
  			} elseif ((ord($string{$offset}) | 0x7F) == 0x7F) {
  				// 0bbbbbbb
  				$charval = ord($string{$offset});
  				$offset += 1;
  			} else {
  				// error? throw some kind of warning here?
  				$charval = false;
  				$offset += 1;
  			}
  			if ($charval !== false) {
  				$newcharstring .= (($charval < 256) ? chr($charval) : '?');
  			}
  		}
  		return $newcharstring;
  	}
  
  	// UTF-8 => UTF-16BE

  	public static function iconv_fallback_utf8_utf16be($string, $bom=false) {

  		$newcharstring = '';
  		if ($bom) {
  			$newcharstring .= "\xFE\xFF";
  		}
  		$offset = 0;
  		$stringlength = strlen($string);
  		while ($offset < $stringlength) {
  			if ((ord($string{$offset}) | 0x07) == 0xF7) {
  				// 11110bbb 10bbbbbb 10bbbbbb 10bbbbbb
  				$charval = ((ord($string{($offset + 0)}) & 0x07) << 18) &
  						   ((ord($string{($offset + 1)}) & 0x3F) << 12) &
  						   ((ord($string{($offset + 2)}) & 0x3F) <<  6) &
  							(ord($string{($offset + 3)}) & 0x3F);
  				$offset += 4;
  			} elseif ((ord($string{$offset}) | 0x0F) == 0xEF) {
  				// 1110bbbb 10bbbbbb 10bbbbbb
  				$charval = ((ord($string{($offset + 0)}) & 0x0F) << 12) &
  						   ((ord($string{($offset + 1)}) & 0x3F) <<  6) &
  							(ord($string{($offset + 2)}) & 0x3F);
  				$offset += 3;
  			} elseif ((ord($string{$offset}) | 0x1F) == 0xDF) {
  				// 110bbbbb 10bbbbbb
  				$charval = ((ord($string{($offset + 0)}) & 0x1F) <<  6) &
  							(ord($string{($offset + 1)}) & 0x3F);
  				$offset += 2;
  			} elseif ((ord($string{$offset}) | 0x7F) == 0x7F) {
  				// 0bbbbbbb
  				$charval = ord($string{$offset});
  				$offset += 1;
  			} else {
  				// error? throw some kind of warning here?
  				$charval = false;
  				$offset += 1;
  			}
  			if ($charval !== false) {

  				$newcharstring .= (($charval < 65536) ? self::BigEndian2String($charval, 2) : "\x00".'?');

  			}
  		}
  		return $newcharstring;
  	}
  
  	// UTF-8 => UTF-16LE

  	public static function iconv_fallback_utf8_utf16le($string, $bom=false) {

  		$newcharstring = '';
  		if ($bom) {
  			$newcharstring .= "\xFF\xFE";
  		}
  		$offset = 0;
  		$stringlength = strlen($string);
  		while ($offset < $stringlength) {
  			if ((ord($string{$offset}) | 0x07) == 0xF7) {
  				// 11110bbb 10bbbbbb 10bbbbbb 10bbbbbb
  				$charval = ((ord($string{($offset + 0)}) & 0x07) << 18) &
  						   ((ord($string{($offset + 1)}) & 0x3F) << 12) &
  						   ((ord($string{($offset + 2)}) & 0x3F) <<  6) &
  							(ord($string{($offset + 3)}) & 0x3F);
  				$offset += 4;
  			} elseif ((ord($string{$offset}) | 0x0F) == 0xEF) {
  				// 1110bbbb 10bbbbbb 10bbbbbb
  				$charval = ((ord($string{($offset + 0)}) & 0x0F) << 12) &
  						   ((ord($string{($offset + 1)}) & 0x3F) <<  6) &
  							(ord($string{($offset + 2)}) & 0x3F);
  				$offset += 3;
  			} elseif ((ord($string{$offset}) | 0x1F) == 0xDF) {
  				// 110bbbbb 10bbbbbb
  				$charval = ((ord($string{($offset + 0)}) & 0x1F) <<  6) &
  							(ord($string{($offset + 1)}) & 0x3F);
  				$offset += 2;
  			} elseif ((ord($string{$offset}) | 0x7F) == 0x7F) {
  				// 0bbbbbbb
  				$charval = ord($string{$offset});
  				$offset += 1;
  			} else {
  				// error? maybe throw some warning here?
  				$charval = false;
  				$offset += 1;
  			}
  			if ($charval !== false) {

  				$newcharstring .= (($charval < 65536) ? self::LittleEndian2String($charval, 2) : '?'."\x00");

  			}
  		}
  		return $newcharstring;
  	}
  
  	// UTF-8 => UTF-16LE (BOM)

  	public static function iconv_fallback_utf8_utf16($string) {
  		return self::iconv_fallback_utf8_utf16le($string, true);

  	}
  
  	// UTF-16BE => UTF-8

  	public static function iconv_fallback_utf16be_utf8($string) {

  		if (substr($string, 0, 2) == "\xFE\xFF") {
  			// strip BOM
  			$string = substr($string, 2);
  		}
  		$newcharstring = '';
  		for ($i = 0; $i < strlen($string); $i += 2) {

  			$charval = self::BigEndian2Int(substr($string, $i, 2));
  			$newcharstring .= self::iconv_fallback_int_utf8($charval);

  		}
  		return $newcharstring;
  	}
  
  	// UTF-16LE => UTF-8

  	public static function iconv_fallback_utf16le_utf8($string) {

  		if (substr($string, 0, 2) == "\xFF\xFE") {
  			// strip BOM
  			$string = substr($string, 2);
  		}
  		$newcharstring = '';
  		for ($i = 0; $i < strlen($string); $i += 2) {

  			$charval = self::LittleEndian2Int(substr($string, $i, 2));
  			$newcharstring .= self::iconv_fallback_int_utf8($charval);

  		}
  		return $newcharstring;
  	}
  
  	// UTF-16BE => ISO-8859-1

  	public static function iconv_fallback_utf16be_iso88591($string) {

  		if (substr($string, 0, 2) == "\xFE\xFF") {
  			// strip BOM
  			$string = substr($string, 2);
  		}
  		$newcharstring = '';
  		for ($i = 0; $i < strlen($string); $i += 2) {

  			$charval = self::BigEndian2Int(substr($string, $i, 2));

  			$newcharstring .= (($charval < 256) ? chr($charval) : '?');
  		}
  		return $newcharstring;
  	}
  
  	// UTF-16LE => ISO-8859-1

  	public static function iconv_fallback_utf16le_iso88591($string) {

  		if (substr($string, 0, 2) == "\xFF\xFE") {
  			// strip BOM
  			$string = substr($string, 2);
  		}
  		$newcharstring = '';
  		for ($i = 0; $i < strlen($string); $i += 2) {

  			$charval = self::LittleEndian2Int(substr($string, $i, 2));

  			$newcharstring .= (($charval < 256) ? chr($charval) : '?');
  		}
  		return $newcharstring;
  	}
  
  	// UTF-16 (BOM) => ISO-8859-1

  	public static function iconv_fallback_utf16_iso88591($string) {

  		$bom = substr($string, 0, 2);
  		if ($bom == "\xFE\xFF") {

  			return self::iconv_fallback_utf16be_iso88591(substr($string, 2));

  		} elseif ($bom == "\xFF\xFE") {

  			return self::iconv_fallback_utf16le_iso88591(substr($string, 2));

  		}
  		return $string;
  	}
  
  	// UTF-16 (BOM) => UTF-8

  	public static function iconv_fallback_utf16_utf8($string) {

  		$bom = substr($string, 0, 2);
  		if ($bom == "\xFE\xFF") {

  			return self::iconv_fallback_utf16be_utf8(substr($string, 2));

  		} elseif ($bom == "\xFF\xFE") {

  			return self::iconv_fallback_utf16le_utf8(substr($string, 2));

  		}
  		return $string;
  	}

  	public static function iconv_fallback($in_charset, $out_charset, $string) {

  
  		if ($in_charset == $out_charset) {
  			return $string;
  		}
  
  		// iconv() availble
  		if (function_exists('iconv')) {
  			if ($converted_string = @iconv($in_charset, $out_charset.'//TRANSLIT', $string)) {
  				switch ($out_charset) {
  					case 'ISO-8859-1':
  						$converted_string = rtrim($converted_string, "\x00");
  						break;
  				}
  				return $converted_string;
  			}
  
  			// iconv() may sometimes fail with "illegal character in input string" error message
  			// and return an empty string, but returning the unconverted string is more useful
  			return $string;
  		}
  
  
  		// iconv() not available
  		static $ConversionFunctionList = array();
  		if (empty($ConversionFunctionList)) {
  			$ConversionFunctionList['ISO-8859-1']['UTF-8']    = 'iconv_fallback_iso88591_utf8';
  			$ConversionFunctionList['ISO-8859-1']['UTF-16']   = 'iconv_fallback_iso88591_utf16';
  			$ConversionFunctionList['ISO-8859-1']['UTF-16BE'] = 'iconv_fallback_iso88591_utf16be';
  			$ConversionFunctionList['ISO-8859-1']['UTF-16LE'] = 'iconv_fallback_iso88591_utf16le';
  			$ConversionFunctionList['UTF-8']['ISO-8859-1']    = 'iconv_fallback_utf8_iso88591';
  			$ConversionFunctionList['UTF-8']['UTF-16']        = 'iconv_fallback_utf8_utf16';
  			$ConversionFunctionList['UTF-8']['UTF-16BE']      = 'iconv_fallback_utf8_utf16be';
  			$ConversionFunctionList['UTF-8']['UTF-16LE']      = 'iconv_fallback_utf8_utf16le';
  			$ConversionFunctionList['UTF-16']['ISO-8859-1']   = 'iconv_fallback_utf16_iso88591';
  			$ConversionFunctionList['UTF-16']['UTF-8']        = 'iconv_fallback_utf16_utf8';
  			$ConversionFunctionList['UTF-16LE']['ISO-8859-1'] = 'iconv_fallback_utf16le_iso88591';
  			$ConversionFunctionList['UTF-16LE']['UTF-8']      = 'iconv_fallback_utf16le_utf8';
  			$ConversionFunctionList['UTF-16BE']['ISO-8859-1'] = 'iconv_fallback_utf16be_iso88591';
  			$ConversionFunctionList['UTF-16BE']['UTF-8']      = 'iconv_fallback_utf16be_utf8';
  		}
  		if (isset($ConversionFunctionList[strtoupper($in_charset)][strtoupper($out_charset)])) {
  			$ConversionFunction = $ConversionFunctionList[strtoupper($in_charset)][strtoupper($out_charset)];

  			return self::$ConversionFunction($string);

  		}
  		throw new Exception('PHP does not have iconv() support - cannot convert from '.$in_charset.' to '.$out_charset);
  	}

  	public static function MultiByteCharString2HTML($string, $charset='ISO-8859-1') {

  		$string = (string) $string; // in case trying to pass a numeric (float, int) string, would otherwise return an empty string
  		$HTMLstring = '';
  
  		switch ($charset) {
  			case '1251':
  			case '1252':
  			case '866':
  			case '932':
  			case '936':
  			case '950':
  			case 'BIG5':
  			case 'BIG5-HKSCS':
  			case 'cp1251':
  			case 'cp1252':
  			case 'cp866':
  			case 'EUC-JP':
  			case 'EUCJP':
  			case 'GB2312':
  			case 'ibm866':
  			case 'ISO-8859-1':
  			case 'ISO-8859-15':
  			case 'ISO8859-1':
  			case 'ISO8859-15':
  			case 'KOI8-R':
  			case 'koi8-ru':
  			case 'koi8r':
  			case 'Shift_JIS':
  			case 'SJIS':
  			case 'win-1251':
  			case 'Windows-1251':
  			case 'Windows-1252':
  				$HTMLstring = htmlentities($string, ENT_COMPAT, $charset);
  				break;
  
  			case 'UTF-8':
  				$strlen = strlen($string);
  				for ($i = 0; $i < $strlen; $i++) {
  					$char_ord_val = ord($string{$i});
  					$charval = 0;
  					if ($char_ord_val < 0x80) {
  						$charval = $char_ord_val;
  					} elseif ((($char_ord_val & 0xF0) >> 4) == 0x0F  &&  $i+3 < $strlen) {
  						$charval  = (($char_ord_val & 0x07) << 18);
  						$charval += ((ord($string{++$i}) & 0x3F) << 12);
  						$charval += ((ord($string{++$i}) & 0x3F) << 6);
  						$charval +=  (ord($string{++$i}) & 0x3F);
  					} elseif ((($char_ord_val & 0xE0) >> 5) == 0x07  &&  $i+2 < $strlen) {
  						$charval  = (($char_ord_val & 0x0F) << 12);
  						$charval += ((ord($string{++$i}) & 0x3F) << 6);
  						$charval +=  (ord($string{++$i}) & 0x3F);
  					} elseif ((($char_ord_val & 0xC0) >> 6) == 0x03  &&  $i+1 < $strlen) {
  						$charval  = (($char_ord_val & 0x1F) << 6);
  						$charval += (ord($string{++$i}) & 0x3F);
  					}
  					if (($charval >= 32) && ($charval <= 127)) {
  						$HTMLstring .= htmlentities(chr($charval));
  					} else {
  						$HTMLstring .= '&#'.$charval.';';
  					}
  				}
  				break;
  
  			case 'UTF-16LE':
  				for ($i = 0; $i < strlen($string); $i += 2) {

  					$charval = self::LittleEndian2Int(substr($string, $i, 2));

  					if (($charval >= 32) && ($charval <= 127)) {
  						$HTMLstring .= chr($charval);
  					} else {
  						$HTMLstring .= '&#'.$charval.';';
  					}
  				}
  				break;
  
  			case 'UTF-16BE':
  				for ($i = 0; $i < strlen($string); $i += 2) {

  					$charval = self::BigEndian2Int(substr($string, $i, 2));

  					if (($charval >= 32) && ($charval <= 127)) {
  						$HTMLstring .= chr($charval);
  					} else {
  						$HTMLstring .= '&#'.$charval.';';
  					}
  				}
  				break;
  
  			default:
  				$HTMLstring = 'ERROR: Character set "'.$charset.'" not supported in MultiByteCharString2HTML()';
  				break;
  		}
  		return $HTMLstring;
  	}

  	public static function RGADnameLookup($namecode) {

  		static $RGADname = array();
  		if (empty($RGADname)) {
  			$RGADname[0] = 'not set';
  			$RGADname[1] = 'Track Gain Adjustment';
  			$RGADname[2] = 'Album Gain Adjustment';
  		}
  
  		return (isset($RGADname[$namecode]) ? $RGADname[$namecode] : '');
  	}

  	public static function RGADoriginatorLookup($originatorcode) {

  		static $RGADoriginator = array();
  		if (empty($RGADoriginator)) {
  			$RGADoriginator[0] = 'unspecified';
  			$RGADoriginator[1] = 'pre-set by artist/producer/mastering engineer';
  			$RGADoriginator[2] = 'set by user';
  			$RGADoriginator[3] = 'determined automatically';
  		}
  
  		return (isset($RGADoriginator[$originatorcode]) ? $RGADoriginator[$originatorcode] : '');
  	}

  	public static function RGADadjustmentLookup($rawadjustment, $signbit) {

  		$adjustment = $rawadjustment / 10;
  		if ($signbit == 1) {
  			$adjustment *= -1;
  		}
  		return (float) $adjustment;
  	}

  	public static function RGADgainString($namecode, $originatorcode, $replaygain) {

  		if ($replaygain < 0) {
  			$signbit = '1';
  		} else {
  			$signbit = '0';
  		}
  		$storedreplaygain = intval(round($replaygain * 10));
  		$gainstring  = str_pad(decbin($namecode), 3, '0', STR_PAD_LEFT);
  		$gainstring .= str_pad(decbin($originatorcode), 3, '0', STR_PAD_LEFT);
  		$gainstring .= $signbit;
  		$gainstring .= str_pad(decbin($storedreplaygain), 9, '0', STR_PAD_LEFT);
  
  		return $gainstring;
  	}

  	public static function RGADamplitude2dB($amplitude) {

  		return 20 * log10($amplitude);
  	}

  	public static function GetDataImageSize($imgData, &$imageinfo=array()) {

  		static $tempdir = '';
  		if (empty($tempdir)) {
  			// yes this is ugly, feel free to suggest a better way
  			require_once(dirname(__FILE__).'/getid3.php');
  			$getid3_temp = new getID3();
  			$tempdir = $getid3_temp->tempdir;
  			unset($getid3_temp);
  		}
  		$GetDataImageSize = false;
  		if ($tempfilename = tempnam($tempdir, 'gI3')) {
  			if (is_writable($tempfilename) && is_file($tempfilename) && ($tmp = fopen($tempfilename, 'wb'))) {
  				fwrite($tmp, $imgData);
  				fclose($tmp);

  				$GetDataImageSize = @getimagesize($tempfilename, $imageinfo);

  			}
  			unlink($tempfilename);
  		}
  		return $GetDataImageSize;
  	}

  	public static function ImageExtFromMime($mime_type) {
  		// temporary way, works OK for now, but should be reworked in the future
  		return str_replace(array('image/', 'x-', 'jpeg'), array('', '', 'jpg'), $mime_type);
  	}
  
  	public static function ImageTypesLookup($imagetypeid) {

  		static $ImageTypesLookup = array();
  		if (empty($ImageTypesLookup)) {
  			$ImageTypesLookup[1]  = 'gif';
  			$ImageTypesLookup[2]  = 'jpeg';
  			$ImageTypesLookup[3]  = 'png';
  			$ImageTypesLookup[4]  = 'swf';
  			$ImageTypesLookup[5]  = 'psd';
  			$ImageTypesLookup[6]  = 'bmp';
  			$ImageTypesLookup[7]  = 'tiff (little-endian)';
  			$ImageTypesLookup[8]  = 'tiff (big-endian)';
  			$ImageTypesLookup[9]  = 'jpc';
  			$ImageTypesLookup[10] = 'jp2';
  			$ImageTypesLookup[11] = 'jpx';
  			$ImageTypesLookup[12] = 'jb2';
  			$ImageTypesLookup[13] = 'swc';
  			$ImageTypesLookup[14] = 'iff';
  		}
  		return (isset($ImageTypesLookup[$imagetypeid]) ? $ImageTypesLookup[$imagetypeid] : '');
  	}

  	public static function CopyTagsToComments(&$ThisFileInfo) {

  
  		// Copy all entries from ['tags'] into common ['comments']
  		if (!empty($ThisFileInfo['tags'])) {
  			foreach ($ThisFileInfo['tags'] as $tagtype => $tagarray) {
  				foreach ($tagarray as $tagname => $tagdata) {
  					foreach ($tagdata as $key => $value) {
  						if (!empty($value)) {
  							if (empty($ThisFileInfo['comments'][$tagname])) {
  
  								// fall through and append value
  
  							} elseif ($tagtype == 'id3v1') {
  
  								$newvaluelength = strlen(trim($value));
  								foreach ($ThisFileInfo['comments'][$tagname] as $existingkey => $existingvalue) {
  									$oldvaluelength = strlen(trim($existingvalue));
  									if (($newvaluelength <= $oldvaluelength) && (substr($existingvalue, 0, $newvaluelength) == trim($value))) {
  										// new value is identical but shorter-than (or equal-length to) one already in comments - skip
  										break 2;
  									}
  								}
  
  							} elseif (!is_array($value)) {
  
  								$newvaluelength = strlen(trim($value));
  								foreach ($ThisFileInfo['comments'][$tagname] as $existingkey => $existingvalue) {
  									$oldvaluelength = strlen(trim($existingvalue));
  									if (($newvaluelength > $oldvaluelength) && (substr(trim($value), 0, strlen($existingvalue)) == $existingvalue)) {
  										$ThisFileInfo['comments'][$tagname][$existingkey] = trim($value);
  										break 2;
  									}
  								}
  
  							}
  							if (is_array($value) || empty($ThisFileInfo['comments'][$tagname]) || !in_array(trim($value), $ThisFileInfo['comments'][$tagname])) {
  								$value = (is_string($value) ? trim($value) : $value);
  								$ThisFileInfo['comments'][$tagname][] = $value;
  							}
  						}
  					}
  				}
  			}
  
  			// Copy to ['comments_html']
  			foreach ($ThisFileInfo['comments'] as $field => $values) {
  				if ($field == 'picture') {
  					// pictures can take up a lot of space, and we don't need multiple copies of them
  					// let there be a single copy in [comments][picture], and not elsewhere
  					continue;
  				}
  				foreach ($values as $index => $value) {
  					if (is_array($value)) {
  						$ThisFileInfo['comments_html'][$field][$index] = $value;
  					} else {

  						$ThisFileInfo['comments_html'][$field][$index] = str_replace('�', '', self::MultiByteCharString2HTML($value, $ThisFileInfo['encoding']));

  					}
  				}
  			}
  		}
  		return true;
  	}

  	public static function EmbeddedLookup($key, $begin, $end, $file, $name) {

  
  		// Cached
  		static $cache;
  		if (isset($cache[$file][$name])) {
  			return (isset($cache[$file][$name][$key]) ? $cache[$file][$name][$key] : '');
  		}
  
  		// Init
  		$keylength  = strlen($key);
  		$line_count = $end - $begin - 7;
  
  		// Open php file
  		$fp = fopen($file, 'r');
  
  		// Discard $begin lines
  		for ($i = 0; $i < ($begin + 3); $i++) {
  			fgets($fp, 1024);
  		}
  
  		// Loop thru line
  		while (0 < $line_count--) {
  
  			// Read line
  			$line = ltrim(fgets($fp, 1024), "\t ");
  
  			// METHOD A: only cache the matching key - less memory but slower on next lookup of not-previously-looked-up key
  			//$keycheck = substr($line, 0, $keylength);
  			//if ($key == $keycheck)  {
  			//	$cache[$file][$name][$keycheck] = substr($line, $keylength + 1);
  			//	break;
  			//}
  
  			// METHOD B: cache all keys in this lookup - more memory but faster on next lookup of not-previously-looked-up key
  			//$cache[$file][$name][substr($line, 0, $keylength)] = trim(substr($line, $keylength + 1));
  			$explodedLine = explode("\t", $line, 2);
  			$ThisKey   = (isset($explodedLine[0]) ? $explodedLine[0] : '');
  			$ThisValue = (isset($explodedLine[1]) ? $explodedLine[1] : '');
  			$cache[$file][$name][$ThisKey] = trim($ThisValue);
  		}
  
  		// Close and return
  		fclose($fp);
  		return (isset($cache[$file][$name][$key]) ? $cache[$file][$name][$key] : '');
  	}

  	public static function IncludeDependency($filename, $sourcefile, $DieOnFailure=false) {

  		global $GETID3_ERRORARRAY;
  
  		if (file_exists($filename)) {
  			if (include_once($filename)) {
  				return true;
  			} else {
  				$diemessage = basename($sourcefile).' depends on '.$filename.', which has errors';
  			}
  		} else {
  			$diemessage = basename($sourcefile).' depends on '.$filename.', which is missing';
  		}
  		if ($DieOnFailure) {
  			throw new Exception($diemessage);
  		} else {
  			$GETID3_ERRORARRAY[] = $diemessage;
  		}
  		return false;
  	}
  
  	public static function trimNullByte($string) {
  		return trim($string, "\x00");
  	}

  	public static function getFileSizeSyscall($path) {
  		$filesize = false;
  
  		if (GETID3_OS_ISWINDOWS) {
  			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:
  				$filesystem = new COM('Scripting.FileSystemObject');
  				$file = $filesystem->GetFile($path);
  				$filesize = $file->Size();
  				unset($filesystem, $file);
  			} else {
  				$commandline = 'for %I in ('.escapeshellarg($path).') do @echo %~zI';
  			}
  		} else {
  			$commandline = 'ls -l '.escapeshellarg($path).' | awk \'{print $5}\'';
  		}
  		if (isset($commandline)) {
  			$output = trim(`$commandline`);
  			if (ctype_digit($output)) {
  				$filesize = (float) $output;
  			}
  		}
  		return $filesize;
  	}

  }