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/sites/all/modules/getid3/getid3/getid3/getid3.lib.php

https://bitbucket.org/norvin/mingen_dts
PHP | 1309 lines | 1019 code | 173 blank | 117 comment | 243 complexity | b811d3f7828951aed176fedc57ad6860 MD5 | raw file
   1<?php
   2/////////////////////////////////////////////////////////////////
   3/// getID3() by James Heinrich <info@getid3.org>               //
   4//  available at http://getid3.sourceforge.net                 //
   5//            or http://www.getid3.org                         //
   6/////////////////////////////////////////////////////////////////
   7//                                                             //
   8// getid3.lib.php - part of getID3()                           //
   9// See readme.txt for more details                             //
  10//                                                            ///
  11/////////////////////////////////////////////////////////////////
  12
  13
  14class getid3_lib
  15{
  16
  17	function PrintHexBytes($string, $hex=true, $spaces=true, $htmlsafe=true) {
  18		$returnstring = '';
  19		for ($i = 0; $i < strlen($string); $i++) {
  20			if ($hex) {
  21				$returnstring .= str_pad(dechex(ord($string{$i})), 2, '0', STR_PAD_LEFT);
  22			} else {
  23				$returnstring .= ' '.(ereg("[\x20-\x7E]", $string{$i}) ? $string{$i} : '¤');
  24			}
  25			if ($spaces) {
  26				$returnstring .= ' ';
  27			}
  28		}
  29		if ($htmlsafe) {
  30			$returnstring = htmlentities($returnstring);
  31		}
  32		return $returnstring;
  33	}
  34
  35	function SafeStripSlashes($text) {
  36		if (get_magic_quotes_gpc()) {
  37			return stripslashes($text);
  38		}
  39		return $text;
  40	}
  41
  42
  43	function trunc($floatnumber) {
  44		// truncates a floating-point number at the decimal point
  45		// returns int (if possible, otherwise float)
  46		if ($floatnumber >= 1) {
  47			$truncatednumber = floor($floatnumber);
  48		} elseif ($floatnumber <= -1) {
  49			$truncatednumber = ceil($floatnumber);
  50		} else {
  51			$truncatednumber = 0;
  52		}
  53		if ($truncatednumber <= 1073741824) { // 2^30
  54			$truncatednumber = (int) $truncatednumber;
  55		}
  56		return $truncatednumber;
  57	}
  58
  59
  60	function CastAsInt($floatnum) {
  61		// convert to float if not already
  62		$floatnum = (float) $floatnum;
  63
  64		// convert a float to type int, only if possible
  65		if (getid3_lib::trunc($floatnum) == $floatnum) {
  66			// it's not floating point
  67			if ($floatnum <= 2147483647) { // 2^31
  68				// it's within int range
  69				$floatnum = (int) $floatnum;
  70			}
  71		}
  72		return $floatnum;
  73	}
  74
  75
  76	function DecimalBinary2Float($binarynumerator) {
  77		$numerator   = getid3_lib::Bin2Dec($binarynumerator);
  78		$denominator = getid3_lib::Bin2Dec('1'.str_repeat('0', strlen($binarynumerator)));
  79		return ($numerator / $denominator);
  80	}
  81
  82
  83	function NormalizeBinaryPoint($binarypointnumber, $maxbits=52) {
  84		// http://www.scri.fsu.edu/~jac/MAD3401/Backgrnd/binary.html
  85		if (strpos($binarypointnumber, '.') === false) {
  86			$binarypointnumber = '0.'.$binarypointnumber;
  87		} elseif ($binarypointnumber{0} == '.') {
  88			$binarypointnumber = '0'.$binarypointnumber;
  89		}
  90		$exponent = 0;
  91		while (($binarypointnumber{0} != '1') || (substr($binarypointnumber, 1, 1) != '.')) {
  92			if (substr($binarypointnumber, 1, 1) == '.') {
  93				$exponent--;
  94				$binarypointnumber = substr($binarypointnumber, 2, 1).'.'.substr($binarypointnumber, 3);
  95			} else {
  96				$pointpos = strpos($binarypointnumber, '.');
  97				$exponent += ($pointpos - 1);
  98				$binarypointnumber = str_replace('.', '', $binarypointnumber);
  99				$binarypointnumber = $binarypointnumber{0}.'.'.substr($binarypointnumber, 1);
 100			}
 101		}
 102		$binarypointnumber = str_pad(substr($binarypointnumber, 0, $maxbits + 2), $maxbits + 2, '0', STR_PAD_RIGHT);
 103		return array('normalized'=>$binarypointnumber, 'exponent'=>(int) $exponent);
 104	}
 105
 106
 107	function Float2BinaryDecimal($floatvalue) {
 108		// http://www.scri.fsu.edu/~jac/MAD3401/Backgrnd/binary.html
 109		$maxbits = 128; // to how many bits of precision should the calculations be taken?
 110		$intpart   = getid3_lib::trunc($floatvalue);
 111		$floatpart = abs($floatvalue - $intpart);
 112		$pointbitstring = '';
 113		while (($floatpart != 0) && (strlen($pointbitstring) < $maxbits)) {
 114			$floatpart *= 2;
 115			$pointbitstring .= (string) getid3_lib::trunc($floatpart);
 116			$floatpart -= getid3_lib::trunc($floatpart);
 117		}
 118		$binarypointnumber = decbin($intpart).'.'.$pointbitstring;
 119		return $binarypointnumber;
 120	}
 121
 122
 123	function Float2String($floatvalue, $bits) {
 124		// http://www.scri.fsu.edu/~jac/MAD3401/Backgrnd/ieee-expl.html
 125		switch ($bits) {
 126			case 32:
 127				$exponentbits = 8;
 128				$fractionbits = 23;
 129				break;
 130
 131			case 64:
 132				$exponentbits = 11;
 133				$fractionbits = 52;
 134				break;
 135
 136			default:
 137				return false;
 138				break;
 139		}
 140		if ($floatvalue >= 0) {
 141			$signbit = '0';
 142		} else {
 143			$signbit = '1';
 144		}
 145		$normalizedbinary  = getid3_lib::NormalizeBinaryPoint(getid3_lib::Float2BinaryDecimal($floatvalue), $fractionbits);
 146		$biasedexponent    = pow(2, $exponentbits - 1) - 1 + $normalizedbinary['exponent']; // (127 or 1023) +/- exponent
 147		$exponentbitstring = str_pad(decbin($biasedexponent), $exponentbits, '0', STR_PAD_LEFT);
 148		$fractionbitstring = str_pad(substr($normalizedbinary['normalized'], 2), $fractionbits, '0', STR_PAD_RIGHT);
 149
 150		return getid3_lib::BigEndian2String(getid3_lib::Bin2Dec($signbit.$exponentbitstring.$fractionbitstring), $bits % 8, false);
 151	}
 152
 153
 154	function LittleEndian2Float($byteword) {
 155		return getid3_lib::BigEndian2Float(strrev($byteword));
 156	}
 157
 158
 159	function BigEndian2Float($byteword) {
 160		// ANSI/IEEE Standard 754-1985, Standard for Binary Floating Point Arithmetic
 161		// http://www.psc.edu/general/software/packages/ieee/ieee.html
 162		// http://www.scri.fsu.edu/~jac/MAD3401/Backgrnd/ieee.html
 163
 164		$bitword = getid3_lib::BigEndian2Bin($byteword);
 165		if (!$bitword) {
 166            return 0;
 167        }
 168		$signbit = $bitword{0};
 169
 170		switch (strlen($byteword) * 8) {
 171			case 32:
 172				$exponentbits = 8;
 173				$fractionbits = 23;
 174				break;
 175
 176			case 64:
 177				$exponentbits = 11;
 178				$fractionbits = 52;
 179				break;
 180
 181			case 80:
 182				// 80-bit Apple SANE format
 183				// http://www.mactech.com/articles/mactech/Vol.06/06.01/SANENormalized/
 184				$exponentstring = substr($bitword, 1, 15);
 185				$isnormalized = intval($bitword{16});
 186				$fractionstring = substr($bitword, 17, 63);
 187				$exponent = pow(2, getid3_lib::Bin2Dec($exponentstring) - 16383);
 188				$fraction = $isnormalized + getid3_lib::DecimalBinary2Float($fractionstring);
 189				$floatvalue = $exponent * $fraction;
 190				if ($signbit == '1') {
 191					$floatvalue *= -1;
 192				}
 193				return $floatvalue;
 194				break;
 195
 196			default:
 197				return false;
 198				break;
 199		}
 200		$exponentstring = substr($bitword, 1, $exponentbits);
 201		$fractionstring = substr($bitword, $exponentbits + 1, $fractionbits);
 202		$exponent = getid3_lib::Bin2Dec($exponentstring);
 203		$fraction = getid3_lib::Bin2Dec($fractionstring);
 204
 205		if (($exponent == (pow(2, $exponentbits) - 1)) && ($fraction != 0)) {
 206			// Not a Number
 207			$floatvalue = false;
 208		} elseif (($exponent == (pow(2, $exponentbits) - 1)) && ($fraction == 0)) {
 209			if ($signbit == '1') {
 210				$floatvalue = '-infinity';
 211			} else {
 212				$floatvalue = '+infinity';
 213			}
 214		} elseif (($exponent == 0) && ($fraction == 0)) {
 215			if ($signbit == '1') {
 216				$floatvalue = -0;
 217			} else {
 218				$floatvalue = 0;
 219			}
 220			$floatvalue = ($signbit ? 0 : -0);
 221		} elseif (($exponent == 0) && ($fraction != 0)) {
 222			// These are 'unnormalized' values
 223			$floatvalue = pow(2, (-1 * (pow(2, $exponentbits - 1) - 2))) * getid3_lib::DecimalBinary2Float($fractionstring);
 224			if ($signbit == '1') {
 225				$floatvalue *= -1;
 226			}
 227		} elseif ($exponent != 0) {
 228			$floatvalue = pow(2, ($exponent - (pow(2, $exponentbits - 1) - 1))) * (1 + getid3_lib::DecimalBinary2Float($fractionstring));
 229			if ($signbit == '1') {
 230				$floatvalue *= -1;
 231			}
 232		}
 233		return (float) $floatvalue;
 234	}
 235
 236
 237	function BigEndian2Int($byteword, $synchsafe=false, $signed=false) {
 238		$intvalue = 0;
 239		$bytewordlen = strlen($byteword);
 240		for ($i = 0; $i < $bytewordlen; $i++) {
 241			if ($synchsafe) { // disregard MSB, effectively 7-bit bytes
 242				$intvalue = $intvalue | (ord($byteword{$i}) & 0x7F) << (($bytewordlen - 1 - $i) * 7);
 243			} else {
 244				$intvalue += ord($byteword{$i}) * pow(256, ($bytewordlen - 1 - $i));
 245			}
 246		}
 247		if ($signed && !$synchsafe) {
 248			// synchsafe ints are not allowed to be signed
 249			switch ($bytewordlen) {
 250				case 1:
 251				case 2:
 252				case 3:
 253				case 4:
 254					$signmaskbit = 0x80 << (8 * ($bytewordlen - 1));
 255					if ($intvalue & $signmaskbit) {
 256						$intvalue = 0 - ($intvalue & ($signmaskbit - 1));
 257					}
 258					break;
 259
 260				default:
 261					die('ERROR: Cannot have signed integers larger than 32-bits in getid3_lib::BigEndian2Int()');
 262					break;
 263			}
 264		}
 265		return getid3_lib::CastAsInt($intvalue);
 266	}
 267
 268
 269	function LittleEndian2Int($byteword, $signed=false) {
 270		return getid3_lib::BigEndian2Int(strrev($byteword), false, $signed);
 271	}
 272
 273
 274	function BigEndian2Bin($byteword) {
 275		$binvalue = '';
 276		$bytewordlen = strlen($byteword);
 277		for ($i = 0; $i < $bytewordlen; $i++) {
 278			$binvalue .= str_pad(decbin(ord($byteword{$i})), 8, '0', STR_PAD_LEFT);
 279		}
 280		return $binvalue;
 281	}
 282
 283
 284	function BigEndian2String($number, $minbytes=1, $synchsafe=false, $signed=false) {
 285		if ($number < 0) {
 286			return false;
 287		}
 288		$maskbyte = (($synchsafe || $signed) ? 0x7F : 0xFF);
 289		$intstring = '';
 290		if ($signed) {
 291			if ($minbytes > 4) {
 292				die('ERROR: Cannot have signed integers larger than 32-bits in getid3_lib::BigEndian2String()');
 293			}
 294			$number = $number & (0x80 << (8 * ($minbytes - 1)));
 295		}
 296		while ($number != 0) {
 297			$quotient = ($number / ($maskbyte + 1));
 298			$intstring = chr(ceil(($quotient - floor($quotient)) * $maskbyte)).$intstring;
 299			$number = floor($quotient);
 300		}
 301		return str_pad($intstring, $minbytes, "\x00", STR_PAD_LEFT);
 302	}
 303
 304
 305	function Dec2Bin($number) {
 306		while ($number >= 256) {
 307			$bytes[] = (($number / 256) - (floor($number / 256))) * 256;
 308			$number = floor($number / 256);
 309		}
 310		$bytes[] = $number;
 311		$binstring = '';
 312		for ($i = 0; $i < count($bytes); $i++) {
 313			$binstring = (($i == count($bytes) - 1) ? decbin($bytes[$i]) : str_pad(decbin($bytes[$i]), 8, '0', STR_PAD_LEFT)).$binstring;
 314		}
 315		return $binstring;
 316	}
 317
 318
 319	function Bin2Dec($binstring, $signed=false) {
 320		$signmult = 1;
 321		if ($signed) {
 322			if ($binstring{0} == '1') {
 323				$signmult = -1;
 324			}
 325			$binstring = substr($binstring, 1);
 326		}
 327		$decvalue = 0;
 328		for ($i = 0; $i < strlen($binstring); $i++) {
 329			$decvalue += ((int) substr($binstring, strlen($binstring) - $i - 1, 1)) * pow(2, $i);
 330		}
 331		return getid3_lib::CastAsInt($decvalue * $signmult);
 332	}
 333
 334
 335	function Bin2String($binstring) {
 336		// return 'hi' for input of '0110100001101001'
 337		$string = '';
 338		$binstringreversed = strrev($binstring);
 339		for ($i = 0; $i < strlen($binstringreversed); $i += 8) {
 340			$string = chr(getid3_lib::Bin2Dec(strrev(substr($binstringreversed, $i, 8)))).$string;
 341		}
 342		return $string;
 343	}
 344
 345
 346	function LittleEndian2String($number, $minbytes=1, $synchsafe=false) {
 347		$intstring = '';
 348		while ($number > 0) {
 349			if ($synchsafe) {
 350				$intstring = $intstring.chr($number & 127);
 351				$number >>= 7;
 352			} else {
 353				$intstring = $intstring.chr($number & 255);
 354				$number >>= 8;
 355			}
 356		}
 357		return str_pad($intstring, $minbytes, "\x00", STR_PAD_RIGHT);
 358	}
 359
 360
 361	function array_merge_clobber($array1, $array2) {
 362		// written by kcŘhireability*com
 363		// taken from http://www.php.net/manual/en/function.array-merge-recursive.php
 364		if (!is_array($array1) || !is_array($array2)) {
 365			return false;
 366		}
 367		$newarray = $array1;
 368		foreach ($array2 as $key => $val) {
 369			if (is_array($val) && isset($newarray[$key]) && is_array($newarray[$key])) {
 370				$newarray[$key] = getid3_lib::array_merge_clobber($newarray[$key], $val);
 371			} else {
 372				$newarray[$key] = $val;
 373			}
 374		}
 375		return $newarray;
 376	}
 377
 378
 379	function array_merge_noclobber($array1, $array2) {
 380		if (!is_array($array1) || !is_array($array2)) {
 381			return false;
 382		}
 383		$newarray = $array1;
 384		foreach ($array2 as $key => $val) {
 385			if (is_array($val) && isset($newarray[$key]) && is_array($newarray[$key])) {
 386				$newarray[$key] = getid3_lib::array_merge_noclobber($newarray[$key], $val);
 387			} elseif (!isset($newarray[$key])) {
 388				$newarray[$key] = $val;
 389			}
 390		}
 391		return $newarray;
 392	}
 393
 394
 395	function fileextension($filename, $numextensions=1) {
 396		if (strstr($filename, '.')) {
 397			$reversedfilename = strrev($filename);
 398			$offset = 0;
 399			for ($i = 0; $i < $numextensions; $i++) {
 400				$offset = strpos($reversedfilename, '.', $offset + 1);
 401				if ($offset === false) {
 402					return '';
 403				}
 404			}
 405			return strrev(substr($reversedfilename, 0, $offset));
 406		}
 407		return '';
 408	}
 409
 410
 411	function PlaytimeString($playtimeseconds) {
 412		$sign = (($playtimeseconds < 0) ? '-' : '');
 413		$playtimeseconds = abs($playtimeseconds);
 414		$contentseconds = round((($playtimeseconds / 60) - floor($playtimeseconds / 60)) * 60);
 415		$contentminutes = floor($playtimeseconds / 60);
 416		if ($contentseconds >= 60) {
 417			$contentseconds -= 60;
 418			$contentminutes++;
 419		}
 420		return $sign.intval($contentminutes).':'.str_pad($contentseconds, 2, 0, STR_PAD_LEFT);
 421	}
 422
 423
 424	function image_type_to_mime_type($imagetypeid) {
 425		// only available in PHP v4.3.0+
 426		static $image_type_to_mime_type = array();
 427		if (empty($image_type_to_mime_type)) {
 428			$image_type_to_mime_type[1]  = 'image/gif';                     // GIF
 429			$image_type_to_mime_type[2]  = 'image/jpeg';                    // JPEG
 430			$image_type_to_mime_type[3]  = 'image/png';                     // PNG
 431			$image_type_to_mime_type[4]  = 'application/x-shockwave-flash'; // Flash
 432			$image_type_to_mime_type[5]  = 'image/psd';                     // PSD
 433			$image_type_to_mime_type[6]  = 'image/bmp';                     // BMP
 434			$image_type_to_mime_type[7]  = 'image/tiff';                    // TIFF: little-endian (Intel)
 435			$image_type_to_mime_type[8]  = 'image/tiff';                    // TIFF: big-endian (Motorola)
 436			//$image_type_to_mime_type[9]  = 'image/jpc';                   // JPC
 437			//$image_type_to_mime_type[10] = 'image/jp2';                   // JPC
 438			//$image_type_to_mime_type[11] = 'image/jpx';                   // JPC
 439			//$image_type_to_mime_type[12] = 'image/jb2';                   // JPC
 440			$image_type_to_mime_type[13] = 'application/x-shockwave-flash'; // Shockwave
 441			$image_type_to_mime_type[14] = 'image/iff';                     // IFF
 442		}
 443		return (isset($image_type_to_mime_type[$imagetypeid]) ? $image_type_to_mime_type[$imagetypeid] : 'application/octet-stream');
 444	}
 445
 446
 447	function DateMac2Unix($macdate) {
 448		// Macintosh timestamp: seconds since 00:00h January 1, 1904
 449		// UNIX timestamp:      seconds since 00:00h January 1, 1970
 450		return getid3_lib::CastAsInt($macdate - 2082844800);
 451	}
 452
 453
 454	function FixedPoint8_8($rawdata) {
 455		return getid3_lib::BigEndian2Int(substr($rawdata, 0, 1)) + (float) (getid3_lib::BigEndian2Int(substr($rawdata, 1, 1)) / pow(2, 8));
 456	}
 457
 458
 459	function FixedPoint16_16($rawdata) {
 460		return getid3_lib::BigEndian2Int(substr($rawdata, 0, 2)) + (float) (getid3_lib::BigEndian2Int(substr($rawdata, 2, 2)) / pow(2, 16));
 461	}
 462
 463
 464	function FixedPoint2_30($rawdata) {
 465		$binarystring = getid3_lib::BigEndian2Bin($rawdata);
 466		return getid3_lib::Bin2Dec(substr($binarystring, 0, 2)) + (float) (getid3_lib::Bin2Dec(substr($binarystring, 2, 30)) / 1073741824);
 467	}
 468
 469
 470	function CreateDeepArray($ArrayPath, $Separator, $Value) {
 471		// assigns $Value to a nested array path:
 472		//   $foo = getid3_lib::CreateDeepArray('/path/to/my', '/', 'file.txt')
 473		// is the same as:
 474		//   $foo = array('path'=>array('to'=>'array('my'=>array('file.txt'))));
 475		// or
 476		//   $foo['path']['to']['my'] = 'file.txt';
 477		while ($ArrayPath && ($ArrayPath{0} == $Separator)) {
 478			$ArrayPath = substr($ArrayPath, 1);
 479		}
 480		if (($pos = strpos($ArrayPath, $Separator)) !== false) {
 481			$ReturnedArray[substr($ArrayPath, 0, $pos)] = getid3_lib::CreateDeepArray(substr($ArrayPath, $pos + 1), $Separator, $Value);
 482		} else {
 483			$ReturnedArray[$ArrayPath] = $Value;
 484		}
 485		return $ReturnedArray;
 486	}
 487
 488	function array_max($arraydata, $returnkey=false) {
 489		$maxvalue = false;
 490		$maxkey = false;
 491		foreach ($arraydata as $key => $value) {
 492			if (!is_array($value)) {
 493				if ($value > $maxvalue) {
 494					$maxvalue = $value;
 495					$maxkey = $key;
 496				}
 497			}
 498		}
 499		return ($returnkey ? $maxkey : $maxvalue);
 500	}
 501
 502	function array_min($arraydata, $returnkey=false) {
 503		$minvalue = false;
 504		$minkey = false;
 505		foreach ($arraydata as $key => $value) {
 506			if (!is_array($value)) {
 507				if ($value > $minvalue) {
 508					$minvalue = $value;
 509					$minkey = $key;
 510				}
 511			}
 512		}
 513		return ($returnkey ? $minkey : $minvalue);
 514	}
 515
 516
 517	function md5_file($file) {
 518
 519		// md5_file() exists in PHP 4.2.0+.
 520		if (function_exists('md5_file')) {
 521			return md5_file($file);
 522		}
 523
 524		if (GETID3_OS_ISWINDOWS) {
 525
 526			$RequiredFiles = array('cygwin1.dll', 'md5sum.exe');
 527			foreach ($RequiredFiles as $required_file) {
 528				if (!is_readable(GETID3_HELPERAPPSDIR.$required_file)) {
 529					die(implode(' and ', $RequiredFiles).' are required in '.GETID3_HELPERAPPSDIR.' for getid3_lib::md5_file() to function under Windows in PHP < v4.2.0');
 530				}
 531			}
 532			$commandline = GETID3_HELPERAPPSDIR.'md5sum.exe "'.str_replace('/', DIRECTORY_SEPARATOR, $file).'"';
 533			if (ereg("^[\\]?([0-9a-f]{32})", strtolower(`$commandline`), $r)) {
 534				return $r[1];
 535			}
 536
 537		} else {
 538
 539			// The following works under UNIX only
 540			$file = str_replace('`', '\\`', $file);
 541			if (ereg("^([0-9a-f]{32})[ \t\n\r]", `md5sum "$file"`, $r)) {
 542				return $r[1];
 543			}
 544
 545		}
 546		return false;
 547	}
 548
 549
 550	function sha1_file($file) {
 551
 552		// sha1_file() exists in PHP 4.3.0+.
 553		if (function_exists('sha1_file')) {
 554			return sha1_file($file);
 555		}
 556
 557		$file = str_replace('`', '\\`', $file);
 558
 559		if (GETID3_OS_ISWINDOWS) {
 560
 561			$RequiredFiles = array('cygwin1.dll', 'sha1sum.exe');
 562			foreach ($RequiredFiles as $required_file) {
 563				if (!is_readable(GETID3_HELPERAPPSDIR.$required_file)) {
 564					die(implode(' and ', $RequiredFiles).' are required in '.GETID3_HELPERAPPSDIR.' for getid3_lib::sha1_file() to function under Windows in PHP < v4.3.0');
 565				}
 566			}
 567			$commandline = GETID3_HELPERAPPSDIR.'sha1sum.exe "'.str_replace('/', DIRECTORY_SEPARATOR, $file).'"';
 568			if (ereg("^sha1=([0-9a-f]{40})", strtolower(`$commandline`), $r)) {
 569				return $r[1];
 570			}
 571
 572		} else {
 573
 574			$commandline = 'sha1sum '.escapeshellarg($file).'';
 575			if (ereg("^([0-9a-f]{40})[ \t\n\r]", strtolower(`$commandline`), $r)) {
 576				return $r[1];
 577			}
 578
 579		}
 580
 581		return false;
 582	}
 583
 584
 585	// Allan Hansen <ahŘartemis*dk>
 586	// getid3_lib::md5_data() - returns md5sum for a file from startuing position to absolute end position
 587	function hash_data($file, $offset, $end, $algorithm) {
 588		if ($end >= pow(2, 31)) {
 589			return false;
 590		}
 591
 592		switch ($algorithm) {
 593			case 'md5':
 594				$hash_function = 'md5_file';
 595				$unix_call     = 'md5sum';
 596				$windows_call  = 'md5sum.exe';
 597				$hash_length   = 32;
 598				break;
 599
 600			case 'sha1':
 601				$hash_function = 'sha1_file';
 602				$unix_call     = 'sha1sum';
 603				$windows_call  = 'sha1sum.exe';
 604				$hash_length   = 40;
 605				break;
 606
 607			default:
 608				die('Invalid algorithm ('.$algorithm.') in getid3_lib::hash_data()');
 609				break;
 610		}
 611		$size = $end - $offset;
 612		while (true) {
 613			if (GETID3_OS_ISWINDOWS) {
 614
 615				// It seems that sha1sum.exe for Windows only works on physical files, does not accept piped data
 616				// Fall back to create-temp-file method:
 617				if ($algorithm == 'sha1') {
 618					break;
 619				}
 620
 621				$RequiredFiles = array('cygwin1.dll', 'head.exe', 'tail.exe', $windows_call);
 622				foreach ($RequiredFiles as $required_file) {
 623					if (!is_readable(GETID3_HELPERAPPSDIR.$required_file)) {
 624						// helper apps not available - fall back to old method
 625						break;
 626					}
 627				}
 628				$commandline  = GETID3_HELPERAPPSDIR.'head.exe -c '.$end.' "'.escapeshellarg(str_replace('/', DIRECTORY_SEPARATOR, $file)).'" | ';
 629				$commandline .= GETID3_HELPERAPPSDIR.'tail.exe -c '.$size.' | ';
 630				$commandline .= GETID3_HELPERAPPSDIR.$windows_call;
 631
 632			} else {
 633
 634				$commandline  = 'head -c'.$end.' '.escapeshellarg($file).' | ';
 635				$commandline .= 'tail -c'.$size.' | ';
 636				$commandline .= $unix_call;
 637
 638			}
 639			if ((bool) ini_get('safe_mode')) {
 640				$ThisFileInfo['warning'][] = 'PHP running in Safe Mode - backtick operator not available, using slower non-system-call '.$algorithm.' algorithm';
 641				break;
 642			}
 643			return substr(`$commandline`, 0, $hash_length);
 644		}
 645
 646		// try to create a temporary file in the system temp directory - invalid dirname should force to system temp dir
 647		if (($data_filename = tempnam('*', 'getID3')) === false) {
 648			// can't find anywhere to create a temp file, just die
 649			return false;
 650		}
 651
 652		// Init
 653		$result = false;
 654
 655		// copy parts of file
 656		if ($fp = @fopen($file, 'rb')) {
 657
 658			if ($fp_data = @fopen($data_filename, 'wb')) {
 659
 660				fseek($fp, $offset, SEEK_SET);
 661				$byteslefttowrite = $end - $offset;
 662				while (($byteslefttowrite > 0) && ($buffer = fread($fp, GETID3_FREAD_BUFFER_SIZE))) {
 663					$byteswritten = fwrite($fp_data, $buffer, $byteslefttowrite);
 664					$byteslefttowrite -= $byteswritten;
 665				}
 666				fclose($fp_data);
 667				$result = getid3_lib::$hash_function($data_filename);
 668
 669			}
 670			fclose($fp);
 671		}
 672		unlink($data_filename);
 673		return $result;
 674	}
 675
 676
 677	function iconv_fallback_int_utf8($charval) {
 678		if ($charval < 128) {
 679			// 0bbbbbbb
 680			$newcharstring = chr($charval);
 681		} elseif ($charval < 2048) {
 682			// 110bbbbb 10bbbbbb
 683			$newcharstring  = chr(($charval >> 6) | 0xC0);
 684			$newcharstring .= chr(($charval & 0x3F) | 0x80);
 685		} elseif ($charval < 65536) {
 686			// 1110bbbb 10bbbbbb 10bbbbbb
 687			$newcharstring  = chr(($charval >> 12) | 0xE0);
 688			$newcharstring .= chr(($charval >>  6) | 0xC0);
 689			$newcharstring .= chr(($charval & 0x3F) | 0x80);
 690		} else {
 691			// 11110bbb 10bbbbbb 10bbbbbb 10bbbbbb
 692			$newcharstring  = chr(($charval >> 18) | 0xF0);
 693			$newcharstring .= chr(($charval >> 12) | 0xC0);
 694			$newcharstring .= chr(($charval >>  6) | 0xC0);
 695			$newcharstring .= chr(($charval & 0x3F) | 0x80);
 696		}
 697		return $newcharstring;
 698	}
 699
 700	// ISO-8859-1 => UTF-8
 701	function iconv_fallback_iso88591_utf8($string, $bom=false) {
 702		if (function_exists('utf8_encode')) {
 703			return utf8_encode($string);
 704		}
 705		// utf8_encode() unavailable, use getID3()'s iconv_fallback() conversions (possibly PHP is compiled without XML support)
 706		$newcharstring = '';
 707		if ($bom) {
 708			$newcharstring .= "\xEF\xBB\xBF";
 709		}
 710		for ($i = 0; $i < strlen($string); $i++) {
 711			$charval = ord($string{$i});
 712			$newcharstring .= getid3_lib::iconv_fallback_int_utf8($charval);
 713		}
 714		return $newcharstring;
 715	}
 716
 717	// ISO-8859-1 => UTF-16BE
 718	function iconv_fallback_iso88591_utf16be($string, $bom=false) {
 719		$newcharstring = '';
 720		if ($bom) {
 721			$newcharstring .= "\xFE\xFF";
 722		}
 723		for ($i = 0; $i < strlen($string); $i++) {
 724			$newcharstring .= "\x00".$string{$i};
 725		}
 726		return $newcharstring;
 727	}
 728
 729	// ISO-8859-1 => UTF-16LE
 730	function iconv_fallback_iso88591_utf16le($string, $bom=false) {
 731		$newcharstring = '';
 732		if ($bom) {
 733			$newcharstring .= "\xFF\xFE";
 734		}
 735		for ($i = 0; $i < strlen($string); $i++) {
 736			$newcharstring .= $string{$i}."\x00";
 737		}
 738		return $newcharstring;
 739	}
 740
 741	// ISO-8859-1 => UTF-16LE (BOM)
 742	function iconv_fallback_iso88591_utf16($string) {
 743		return getid3_lib::iconv_fallback_iso88591_utf16le($string, true);
 744	}
 745
 746	// UTF-8 => ISO-8859-1
 747	function iconv_fallback_utf8_iso88591($string) {
 748		if (function_exists('utf8_decode')) {
 749			return utf8_decode($string);
 750		}
 751		// utf8_decode() unavailable, use getID3()'s iconv_fallback() conversions (possibly PHP is compiled without XML support)
 752		$newcharstring = '';
 753		$offset = 0;
 754		$stringlength = strlen($string);
 755		while ($offset < $stringlength) {
 756			if ((ord($string{$offset}) | 0x07) == 0xF7) {
 757				// 11110bbb 10bbbbbb 10bbbbbb 10bbbbbb
 758				$charval = ((ord($string{($offset + 0)}) & 0x07) << 18) &
 759				           ((ord($string{($offset + 1)}) & 0x3F) << 12) &
 760				           ((ord($string{($offset + 2)}) & 0x3F) <<  6) &
 761				            (ord($string{($offset + 3)}) & 0x3F);
 762				$offset += 4;
 763			} elseif ((ord($string{$offset}) | 0x0F) == 0xEF) {
 764				// 1110bbbb 10bbbbbb 10bbbbbb
 765				$charval = ((ord($string{($offset + 0)}) & 0x0F) << 12) &
 766				           ((ord($string{($offset + 1)}) & 0x3F) <<  6) &
 767				            (ord($string{($offset + 2)}) & 0x3F);
 768				$offset += 3;
 769			} elseif ((ord($string{$offset}) | 0x1F) == 0xDF) {
 770				// 110bbbbb 10bbbbbb
 771				$charval = ((ord($string{($offset + 0)}) & 0x1F) <<  6) &
 772				            (ord($string{($offset + 1)}) & 0x3F);
 773				$offset += 2;
 774			} elseif ((ord($string{$offset}) | 0x7F) == 0x7F) {
 775				// 0bbbbbbb
 776				$charval = ord($string{$offset});
 777				$offset += 1;
 778			} else {
 779				// error? throw some kind of warning here?
 780				$charval = false;
 781				$offset += 1;
 782			}
 783			if ($charval !== false) {
 784				$newcharstring .= (($charval < 256) ? chr($charval) : '?');
 785			}
 786		}
 787		return $newcharstring;
 788	}
 789
 790	// UTF-8 => UTF-16BE
 791	function iconv_fallback_utf8_utf16be($string, $bom=false) {
 792		$newcharstring = '';
 793		if ($bom) {
 794			$newcharstring .= "\xFE\xFF";
 795		}
 796		$offset = 0;
 797		$stringlength = strlen($string);
 798		while ($offset < $stringlength) {
 799			if ((ord($string{$offset}) | 0x07) == 0xF7) {
 800				// 11110bbb 10bbbbbb 10bbbbbb 10bbbbbb
 801				$charval = ((ord($string{($offset + 0)}) & 0x07) << 18) &
 802				           ((ord($string{($offset + 1)}) & 0x3F) << 12) &
 803				           ((ord($string{($offset + 2)}) & 0x3F) <<  6) &
 804				            (ord($string{($offset + 3)}) & 0x3F);
 805				$offset += 4;
 806			} elseif ((ord($string{$offset}) | 0x0F) == 0xEF) {
 807				// 1110bbbb 10bbbbbb 10bbbbbb
 808				$charval = ((ord($string{($offset + 0)}) & 0x0F) << 12) &
 809				           ((ord($string{($offset + 1)}) & 0x3F) <<  6) &
 810				            (ord($string{($offset + 2)}) & 0x3F);
 811				$offset += 3;
 812			} elseif ((ord($string{$offset}) | 0x1F) == 0xDF) {
 813				// 110bbbbb 10bbbbbb
 814				$charval = ((ord($string{($offset + 0)}) & 0x1F) <<  6) &
 815				            (ord($string{($offset + 1)}) & 0x3F);
 816				$offset += 2;
 817			} elseif ((ord($string{$offset}) | 0x7F) == 0x7F) {
 818				// 0bbbbbbb
 819				$charval = ord($string{$offset});
 820				$offset += 1;
 821			} else {
 822				// error? throw some kind of warning here?
 823				$charval = false;
 824				$offset += 1;
 825			}
 826			if ($charval !== false) {
 827				$newcharstring .= (($charval < 65536) ? getid3_lib::BigEndian2String($charval, 2) : "\x00".'?');
 828			}
 829		}
 830		return $newcharstring;
 831	}
 832
 833	// UTF-8 => UTF-16LE
 834	function iconv_fallback_utf8_utf16le($string, $bom=false) {
 835		$newcharstring = '';
 836		if ($bom) {
 837			$newcharstring .= "\xFF\xFE";
 838		}
 839		$offset = 0;
 840		$stringlength = strlen($string);
 841		while ($offset < $stringlength) {
 842			if ((ord($string{$offset}) | 0x07) == 0xF7) {
 843				// 11110bbb 10bbbbbb 10bbbbbb 10bbbbbb
 844				$charval = ((ord($string{($offset + 0)}) & 0x07) << 18) &
 845				           ((ord($string{($offset + 1)}) & 0x3F) << 12) &
 846				           ((ord($string{($offset + 2)}) & 0x3F) <<  6) &
 847				            (ord($string{($offset + 3)}) & 0x3F);
 848				$offset += 4;
 849			} elseif ((ord($string{$offset}) | 0x0F) == 0xEF) {
 850				// 1110bbbb 10bbbbbb 10bbbbbb
 851				$charval = ((ord($string{($offset + 0)}) & 0x0F) << 12) &
 852				           ((ord($string{($offset + 1)}) & 0x3F) <<  6) &
 853				            (ord($string{($offset + 2)}) & 0x3F);
 854				$offset += 3;
 855			} elseif ((ord($string{$offset}) | 0x1F) == 0xDF) {
 856				// 110bbbbb 10bbbbbb
 857				$charval = ((ord($string{($offset + 0)}) & 0x1F) <<  6) &
 858				            (ord($string{($offset + 1)}) & 0x3F);
 859				$offset += 2;
 860			} elseif ((ord($string{$offset}) | 0x7F) == 0x7F) {
 861				// 0bbbbbbb
 862				$charval = ord($string{$offset});
 863				$offset += 1;
 864			} else {
 865				// error? maybe throw some warning here?
 866				$charval = false;
 867				$offset += 1;
 868			}
 869			if ($charval !== false) {
 870				$newcharstring .= (($charval < 65536) ? getid3_lib::LittleEndian2String($charval, 2) : '?'."\x00");
 871			}
 872		}
 873		return $newcharstring;
 874	}
 875
 876	// UTF-8 => UTF-16LE (BOM)
 877	function iconv_fallback_utf8_utf16($string) {
 878		return getid3_lib::iconv_fallback_utf8_utf16le($string, true);
 879	}
 880
 881	// UTF-16BE => UTF-8
 882	function iconv_fallback_utf16be_utf8($string) {
 883		if (substr($string, 0, 2) == "\xFE\xFF") {
 884			// strip BOM
 885			$string = substr($string, 2);
 886		}
 887		$newcharstring = '';
 888		for ($i = 0; $i < strlen($string); $i += 2) {
 889			$charval = getid3_lib::BigEndian2Int(substr($string, $i, 2));
 890			$newcharstring .= getid3_lib::iconv_fallback_int_utf8($charval);
 891		}
 892		return $newcharstring;
 893	}
 894
 895	// UTF-16LE => UTF-8
 896	function iconv_fallback_utf16le_utf8($string) {
 897		if (substr($string, 0, 2) == "\xFF\xFE") {
 898			// strip BOM
 899			$string = substr($string, 2);
 900		}
 901		$newcharstring = '';
 902		for ($i = 0; $i < strlen($string); $i += 2) {
 903			$charval = getid3_lib::LittleEndian2Int(substr($string, $i, 2));
 904			$newcharstring .= getid3_lib::iconv_fallback_int_utf8($charval);
 905		}
 906		return $newcharstring;
 907	}
 908
 909	// UTF-16BE => ISO-8859-1
 910	function iconv_fallback_utf16be_iso88591($string) {
 911		if (substr($string, 0, 2) == "\xFE\xFF") {
 912			// strip BOM
 913			$string = substr($string, 2);
 914		}
 915		$newcharstring = '';
 916		for ($i = 0; $i < strlen($string); $i += 2) {
 917			$charval = getid3_lib::BigEndian2Int(substr($string, $i, 2));
 918			$newcharstring .= (($charval < 256) ? chr($charval) : '?');
 919		}
 920		return $newcharstring;
 921	}
 922
 923	// UTF-16LE => ISO-8859-1
 924	function iconv_fallback_utf16le_iso88591($string) {
 925		if (substr($string, 0, 2) == "\xFF\xFE") {
 926			// strip BOM
 927			$string = substr($string, 2);
 928		}
 929		$newcharstring = '';
 930		for ($i = 0; $i < strlen($string); $i += 2) {
 931			$charval = getid3_lib::LittleEndian2Int(substr($string, $i, 2));
 932			$newcharstring .= (($charval < 256) ? chr($charval) : '?');
 933		}
 934		return $newcharstring;
 935	}
 936
 937	// UTF-16 (BOM) => ISO-8859-1
 938	function iconv_fallback_utf16_iso88591($string) {
 939		$bom = substr($string, 0, 2);
 940		if ($bom == "\xFE\xFF") {
 941			return getid3_lib::iconv_fallback_utf16be_iso88591(substr($string, 2));
 942		} elseif ($bom == "\xFF\xFE") {
 943			return getid3_lib::iconv_fallback_utf16le_iso88591(substr($string, 2));
 944		}
 945		return $string;
 946	}
 947
 948	// UTF-16 (BOM) => UTF-8
 949	function iconv_fallback_utf16_utf8($string) {
 950		$bom = substr($string, 0, 2);
 951		if ($bom == "\xFE\xFF") {
 952			return getid3_lib::iconv_fallback_utf16be_utf8(substr($string, 2));
 953		} elseif ($bom == "\xFF\xFE") {
 954			return getid3_lib::iconv_fallback_utf16le_utf8(substr($string, 2));
 955		}
 956		return $string;
 957	}
 958
 959	function iconv_fallback($in_charset, $out_charset, $string) {
 960
 961		if ($in_charset == $out_charset) {
 962			return $string;
 963		}
 964
 965		// iconv() availble
 966		if (function_exists('iconv')) {
 967
 968		    if ($converted_string = @iconv($in_charset, $out_charset.'//TRANSLIT', $string)) {
 969    			switch ($out_charset) {
 970    				case 'ISO-8859-1':
 971    					$converted_string = rtrim($converted_string, "\x00");
 972    					break;
 973    			}
 974    			return $converted_string;
 975    		}
 976
 977    		// iconv() may sometimes fail with "illegal character in input string" error message
 978    		// and return an empty string, but returning the unconverted string is more useful
 979    		return $string;
 980    	}
 981
 982
 983        // iconv() not available
 984		static $ConversionFunctionList = array();
 985		if (empty($ConversionFunctionList)) {
 986			$ConversionFunctionList['ISO-8859-1']['UTF-8']    = 'iconv_fallback_iso88591_utf8';
 987			$ConversionFunctionList['ISO-8859-1']['UTF-16']   = 'iconv_fallback_iso88591_utf16';
 988			$ConversionFunctionList['ISO-8859-1']['UTF-16BE'] = 'iconv_fallback_iso88591_utf16be';
 989			$ConversionFunctionList['ISO-8859-1']['UTF-16LE'] = 'iconv_fallback_iso88591_utf16le';
 990			$ConversionFunctionList['UTF-8']['ISO-8859-1']    = 'iconv_fallback_utf8_iso88591';
 991			$ConversionFunctionList['UTF-8']['UTF-16']        = 'iconv_fallback_utf8_utf16';
 992			$ConversionFunctionList['UTF-8']['UTF-16BE']      = 'iconv_fallback_utf8_utf16be';
 993			$ConversionFunctionList['UTF-8']['UTF-16LE']      = 'iconv_fallback_utf8_utf16le';
 994			$ConversionFunctionList['UTF-16']['ISO-8859-1']   = 'iconv_fallback_utf16_iso88591';
 995			$ConversionFunctionList['UTF-16']['UTF-8']        = 'iconv_fallback_utf16_utf8';
 996			$ConversionFunctionList['UTF-16LE']['ISO-8859-1'] = 'iconv_fallback_utf16le_iso88591';
 997			$ConversionFunctionList['UTF-16LE']['UTF-8']      = 'iconv_fallback_utf16le_utf8';
 998			$ConversionFunctionList['UTF-16BE']['ISO-8859-1'] = 'iconv_fallback_utf16be_iso88591';
 999			$ConversionFunctionList['UTF-16BE']['UTF-8']      = 'iconv_fallback_utf16be_utf8';
1000		}
1001		if (isset($ConversionFunctionList[strtoupper($in_charset)][strtoupper($out_charset)])) {
1002			$ConversionFunction = $ConversionFunctionList[strtoupper($in_charset)][strtoupper($out_charset)];
1003			return getid3_lib::$ConversionFunction($string);
1004		}
1005		die('PHP does not have iconv() support - cannot convert from '.$in_charset.' to '.$out_charset);
1006	}
1007
1008
1009	function MultiByteCharString2HTML($string, $charset='ISO-8859-1') {
1010		$HTMLstring = '';
1011
1012		switch ($charset) {
1013			case 'ISO-8859-1':
1014			case 'ISO8859-1':
1015			case 'ISO-8859-15':
1016			case 'ISO8859-15':
1017			case 'cp866':
1018			case 'ibm866':
1019			case '866':
1020			case 'cp1251':
1021			case 'Windows-1251':
1022			case 'win-1251':
1023			case '1251':
1024			case 'cp1252':
1025			case 'Windows-1252':
1026			case '1252':
1027			case 'KOI8-R':
1028			case 'koi8-ru':
1029			case 'koi8r':
1030			case 'BIG5':
1031			case '950':
1032			case 'GB2312':
1033			case '936':
1034			case 'BIG5-HKSCS':
1035			case 'Shift_JIS':
1036			case 'SJIS':
1037			case '932':
1038			case 'EUC-JP':
1039			case 'EUCJP':
1040				$HTMLstring = htmlentities($string, ENT_COMPAT, $charset);
1041				break;
1042
1043			case 'UTF-8':
1044				$strlen = strlen($string);
1045				for ($i = 0; $i < $strlen; $i++) {
1046					$char_ord_val = ord($string{$i});
1047					$charval = 0;
1048					if ($char_ord_val < 0x80) {
1049						$charval = $char_ord_val;
1050					} elseif ((($char_ord_val & 0xF0) >> 4) == 0x0F  &&  $i+3 < $strlen) {
1051						$charval  = (($char_ord_val & 0x07) << 18);
1052						$charval += ((ord($string{++$i}) & 0x3F) << 12);
1053						$charval += ((ord($string{++$i}) & 0x3F) << 6);
1054						$charval +=  (ord($string{++$i}) & 0x3F);
1055					} elseif ((($char_ord_val & 0xE0) >> 5) == 0x07  &&  $i+2 < $strlen) {
1056						$charval  = (($char_ord_val & 0x0F) << 12);
1057						$charval += ((ord($string{++$i}) & 0x3F) << 6);
1058						$charval +=  (ord($string{++$i}) & 0x3F);
1059					} elseif ((($char_ord_val & 0xC0) >> 6) == 0x03  &&  $i+1 < $strlen) {
1060						$charval  = (($char_ord_val & 0x1F) << 6);
1061						$charval += (ord($string{++$i}) & 0x3F);
1062					}
1063					if (($charval >= 32) && ($charval <= 127)) {
1064						$HTMLstring .= chr($charval);
1065					} else {
1066						$HTMLstring .= '&#'.$charval.';';
1067					}
1068				}
1069				break;
1070
1071			case 'UTF-16LE':
1072				for ($i = 0; $i < strlen($string); $i += 2) {
1073					$charval = getid3_lib::LittleEndian2Int(substr($string, $i, 2));
1074					if (($charval >= 32) && ($charval <= 127)) {
1075						$HTMLstring .= chr($charval);
1076					} else {
1077						$HTMLstring .= '&#'.$charval.';';
1078					}
1079				}
1080				break;
1081
1082			case 'UTF-16BE':
1083				for ($i = 0; $i < strlen($string); $i += 2) {
1084					$charval = getid3_lib::BigEndian2Int(substr($string, $i, 2));
1085					if (($charval >= 32) && ($charval <= 127)) {
1086						$HTMLstring .= chr($charval);
1087					} else {
1088						$HTMLstring .= '&#'.$charval.';';
1089					}
1090				}
1091				break;
1092
1093			default:
1094				$HTMLstring = 'ERROR: Character set "'.$charset.'" not supported in MultiByteCharString2HTML()';
1095				break;
1096		}
1097		return $HTMLstring;
1098	}
1099
1100
1101
1102	function RGADnameLookup($namecode) {
1103		static $RGADname = array();
1104		if (empty($RGADname)) {
1105			$RGADname[0] = 'not set';
1106			$RGADname[1] = 'Track Gain Adjustment';
1107			$RGADname[2] = 'Album Gain Adjustment';
1108		}
1109
1110		return (isset($RGADname[$namecode]) ? $RGADname[$namecode] : '');
1111	}
1112
1113
1114	function RGADoriginatorLookup($originatorcode) {
1115		static $RGADoriginator = array();
1116		if (empty($RGADoriginator)) {
1117			$RGADoriginator[0] = 'unspecified';
1118			$RGADoriginator[1] = 'pre-set by artist/producer/mastering engineer';
1119			$RGADoriginator[2] = 'set by user';
1120			$RGADoriginator[3] = 'determined automatically';
1121		}
1122
1123		return (isset($RGADoriginator[$originatorcode]) ? $RGADoriginator[$originatorcode] : '');
1124	}
1125
1126
1127	function RGADadjustmentLookup($rawadjustment, $signbit) {
1128		$adjustment = $rawadjustment / 10;
1129		if ($signbit == 1) {
1130			$adjustment *= -1;
1131		}
1132		return (float) $adjustment;
1133	}
1134
1135
1136	function RGADgainString($namecode, $originatorcode, $replaygain) {
1137		if ($replaygain < 0) {
1138			$signbit = '1';
1139		} else {
1140			$signbit = '0';
1141		}
1142		$storedreplaygain = intval(round($replaygain * 10));
1143		$gainstring  = str_pad(decbin($namecode), 3, '0', STR_PAD_LEFT);
1144		$gainstring .= str_pad(decbin($originatorcode), 3, '0', STR_PAD_LEFT);
1145		$gainstring .= $signbit;
1146		$gainstring .= str_pad(decbin($storedreplaygain), 9, '0', STR_PAD_LEFT);
1147
1148		return $gainstring;
1149	}
1150
1151	function RGADamplitude2dB($amplitude) {
1152		return 20 * log10($amplitude);
1153	}
1154
1155
1156	function GetDataImageSize($imgData) {
1157		$GetDataImageSize = false;
1158		if ($tempfilename = tempnam('*', 'getID3')) {
1159			if ($tmp = @fopen($tempfilename, 'wb')) {
1160				fwrite($tmp, $imgData);
1161				fclose($tmp);
1162				$GetDataImageSize = @GetImageSize($tempfilename);
1163			}
1164			unlink($tempfilename);
1165		}
1166		return $GetDataImageSize;
1167	}
1168
1169	function ImageTypesLookup($imagetypeid) {
1170		static $ImageTypesLookup = array();
1171		if (empty($ImageTypesLookup)) {
1172			$ImageTypesLookup[1]  = 'gif';
1173			$ImageTypesLookup[2]  = 'jpeg';
1174			$ImageTypesLookup[3]  = 'png';
1175			$ImageTypesLookup[4]  = 'swf';
1176			$ImageTypesLookup[5]  = 'psd';
1177			$ImageTypesLookup[6]  = 'bmp';
1178			$ImageTypesLookup[7]  = 'tiff (little-endian)';
1179			$ImageTypesLookup[8]  = 'tiff (big-endian)';
1180			$ImageTypesLookup[9]  = 'jpc';
1181			$ImageTypesLookup[10] = 'jp2';
1182			$ImageTypesLookup[11] = 'jpx';
1183			$ImageTypesLookup[12] = 'jb2';
1184			$ImageTypesLookup[13] = 'swc';
1185			$ImageTypesLookup[14] = 'iff';
1186		}
1187		return (isset($ImageTypesLookup[$imagetypeid]) ? $ImageTypesLookup[$imagetypeid] : '');
1188	}
1189
1190	function CopyTagsToComments(&$ThisFileInfo) {
1191
1192		// Copy all entries from ['tags'] into common ['comments']
1193		if (!empty($ThisFileInfo['tags'])) {
1194			foreach ($ThisFileInfo['tags'] as $tagtype => $tagarray) {
1195				foreach ($tagarray as $tagname => $tagdata) {
1196					foreach ($tagdata as $key => $value) {
1197						if (!empty($value)) {
1198							if (empty($ThisFileInfo['comments'][$tagname])) {
1199
1200								// fall through and append value
1201
1202							} elseif ($tagtype == 'id3v1') {
1203
1204								$newvaluelength = strlen(trim($value));
1205								foreach ($ThisFileInfo['comments'][$tagname] as $existingkey => $existingvalue) {
1206									$oldvaluelength = strlen(trim($existingvalue));
1207									if (($newvaluelength <= $oldvaluelength) && (substr($existingvalue, 0, $newvaluelength) == trim($value))) {
1208										// new value is identical but shorter-than (or equal-length to) one already in comments - skip
1209										break 2;
1210									}
1211								}
1212
1213							} else {
1214
1215								$newvaluelength = strlen(trim($value));
1216								foreach ($ThisFileInfo['comments'][$tagname] as $existingkey => $existingvalue) {
1217									$oldvaluelength = strlen(trim($existingvalue));
1218									if (($newvaluelength > $oldvaluelength) && (substr(trim($value), 0, strlen($existingvalue)) == $existingvalue)) {
1219										$ThisFileInfo['comments'][$tagname][$existingkey] = trim($value);
1220										break 2;
1221									}
1222								}
1223
1224							}
1225							if (empty($ThisFileInfo['comments'][$tagname]) || !in_array(trim($value), $ThisFileInfo['comments'][$tagname])) {
1226								$ThisFileInfo['comments'][$tagname][] = trim($value);
1227							}
1228						}
1229					}
1230				}
1231			}
1232
1233			// Copy to ['comments_html']
1234    		foreach ($ThisFileInfo['comments'] as $field => $values) {
1235    		    foreach ($values as $index => $value) {
1236    		        $ThisFileInfo['comments_html'][$field][$index] = str_replace('&#0;', '', getid3_lib::MultiByteCharString2HTML($value, $ThisFileInfo['encoding']));
1237    		    }
1238            }
1239		}
1240	}
1241
1242
1243	function EmbeddedLookup($key, $begin, $end, $file, $name) {
1244
1245		// Cached
1246		static $cache;
1247		if (isset($cache[$file][$name])) {
1248			return @$cache[$file][$name][$key];
1249		}
1250
1251		// Init
1252		$keylength  = strlen($key);
1253		$line_count = $end - $begin - 7;
1254
1255		// Open php file
1256		$fp = fopen($file, 'r');
1257
1258		// Discard $begin lines
1259		for ($i = 0; $i < ($begin + 3); $i++) {
1260			fgets($fp, 1024);
1261		}
1262
1263		// Loop thru line
1264		while (0 < $line_count--) {
1265
1266			// Read line
1267			$line = ltrim(fgets($fp, 1024), "\t ");
1268
1269			// METHOD A: only cache the matching key - less memory but slower on next lookup of not-previously-looked-up key
1270			//$keycheck = substr($line, 0, $keylength);
1271			//if ($key == $keycheck)  {
1272			//	$cache[$file][$name][$keycheck] = substr($line, $keylength + 1);
1273			//	break;
1274			//}
1275
1276			// METHOD B: cache all keys in this lookup - more memory but faster on next lookup of not-previously-looked-up key
1277			//$cache[$file][$name][substr($line, 0, $keylength)] = trim(substr($line, $keylength + 1));
1278			@list($ThisKey, $ThisValue) = explode("\t", $line, 2);
1279			$cache[$file][$name][$ThisKey] = trim($ThisValue);
1280		}
1281
1282		// Close and return
1283		fclose($fp);
1284		return @$cache[$file][$name][$key];
1285	}
1286
1287	function IncludeDependency($filename, $sourcefile, $DieOnFailure=false) {
1288		global $GETID3_ERRORARRAY;
1289
1290		if (file_exists($filename)) {
1291			if (@include_once($filename)) {
1292				return true;
1293			} else {
1294				$diemessage = basename($sourcefile).' depends on '.$filename.', which has errors';
1295			}
1296		} else {
1297			$diemessage = basename($sourcefile).' depends on '.$filename.', which is missing';
1298		}
1299		if ($DieOnFailure) {
1300			die($diemessage);
1301		} else {
1302			$GETID3_ERRORARRAY[] = $diemessage;
1303		}
1304		return false;
1305	}
1306
1307}
1308
1309?>