<?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
{

    function PrintHexBytes($string, $hex=true, $spaces=true, $htmlsafe=true) {
        $returnstring = '';
        for ($i = 0; $i < strlen($string); $i++) {
            if ($hex) {
                $returnstring .= str_pad(dechex(ord($string{$i})), 2, '0', STR_PAD_LEFT);
            } else {
                $returnstring .= ' '.(ereg("[\x20-\x7E]", $string{$i}) ? $string{$i} : '¤');
            }
            if ($spaces) {
                $returnstring .= ' ';
            }
        }
        if ($htmlsafe) {
            $returnstring = htmlentities($returnstring);
        }
        return $returnstring;
    }

    function SafeStripSlashes($text) {
        if (get_magic_quotes_gpc()) {
            return stripslashes($text);
        }
        return $text;
    }


    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 {
            $truncatednumber = 0;
        }
        if ($truncatednumber <= 1073741824) { // 2^30
            $truncatednumber = (int) $truncatednumber;
        }
        return $truncatednumber;
    }


    function CastAsInt($floatnum) {
        // convert to float if not already
        $floatnum = (float) $floatnum;

        // convert a float to type int, only if possible
        if (getid3_lib::trunc($floatnum) == $floatnum) {
            // it's not floating point
            if ($floatnum <= 2147483647) { // 2^31
                // it's within int range
                $floatnum = (int) $floatnum;
            }
        }
        return $floatnum;
    }


    function DecimalBinary2Float($binarynumerator) {
        $numerator   = getid3_lib::Bin2Dec($binarynumerator);
        $denominator = getid3_lib::Bin2Dec('1'.str_repeat('0', strlen($binarynumerator)));
        return ($numerator / $denominator);
    }


    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);
    }


    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?
        $intpart   = getid3_lib::trunc($floatvalue);
        $floatpart = abs($floatvalue - $intpart);
        $pointbitstring = '';
        while (($floatpart != 0) && (strlen($pointbitstring) < $maxbits)) {
            $floatpart *= 2;
            $pointbitstring .= (string) getid3_lib::trunc($floatpart);
            $floatpart -= getid3_lib::trunc($floatpart);
        }
        $binarypointnumber = decbin($intpart).'.'.$pointbitstring;
        return $binarypointnumber;
    }


    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';
        }
        $normalizedbinary  = getid3_lib::NormalizeBinaryPoint(getid3_lib::Float2BinaryDecimal($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 getid3_lib::BigEndian2String(getid3_lib::Bin2Dec($signbit.$exponentbitstring.$fractionbitstring), $bits % 8, false);
    }


    function LittleEndian2Float($byteword) {
        return getid3_lib::BigEndian2Float(strrev($byteword));
    }


    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

        $bitword = getid3_lib::BigEndian2Bin($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);
                $exponent = pow(2, getid3_lib::Bin2Dec($exponentstring) - 16383);
                $fraction = $isnormalized + getid3_lib::DecimalBinary2Float($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);
        $exponent = getid3_lib::Bin2Dec($exponentstring);
        $fraction = getid3_lib::Bin2Dec($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, $exponentbits - 1) - 2))) * getid3_lib::DecimalBinary2Float($fractionstring);
            if ($signbit == '1') {
                $floatvalue *= -1;
            }
        } elseif ($exponent != 0) {
            $floatvalue = pow(2, ($exponent - (pow(2, $exponentbits - 1) - 1))) * (1 + getid3_lib::DecimalBinary2Float($fractionstring));
            if ($signbit == '1') {
                $floatvalue *= -1;
            }
        }
        return (float) $floatvalue;
    }


    function BigEndian2Int($byteword, $synchsafe=false, $signed=false) {
        $intvalue = 0;
        $bytewordlen = strlen($byteword);
        for ($i = 0; $i < $bytewordlen; $i++) {
            if ($synchsafe) { // disregard MSB, effectively 7-bit bytes
                $intvalue = $intvalue | (ord($byteword{$i}) & 0x7F) << (($bytewordlen - 1 - $i) * 7);
            } else {
                $intvalue += ord($byteword{$i}) * pow(256, ($bytewordlen - 1 - $i));
            }
        }
        if ($signed && !$synchsafe) {
            // synchsafe ints are not allowed to be signed
            switch ($bytewordlen) {
                case 1:
                case 2:
                case 3:
                case 4:
                    $signmaskbit = 0x80 << (8 * ($bytewordlen - 1));
                    if ($intvalue & $signmaskbit) {
                        $intvalue = 0 - ($intvalue & ($signmaskbit - 1));
                    }
                    break;

                default:
                    die('ERROR: Cannot have signed integers larger than 32-bits in getid3_lib::BigEndian2Int()');
                    break;
            }
        }
        return getid3_lib::CastAsInt($intvalue);
    }


    function LittleEndian2Int($byteword, $signed=false) {
        return getid3_lib::BigEndian2Int(strrev($byteword), false, $signed);
    }


    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;
    }


    function BigEndian2String($number, $minbytes=1, $synchsafe=false, $signed=false) {
        if ($number < 0) {
            return false;
        }
        $maskbyte = (($synchsafe || $signed) ? 0x7F : 0xFF);
        $intstring = '';
        if ($signed) {
            if ($minbytes > 4) {
                die('ERROR: Cannot have signed integers larger than 32-bits in getid3_lib::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);
    }


    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;
    }


    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, $i);
        }
        return getid3_lib::CastAsInt($decvalue * $signmult);
    }


    function Bin2String($binstring) {
        // return 'hi' for input of '0110100001101001'
        $string = '';
        $binstringreversed = strrev($binstring);
        for ($i = 0; $i < strlen($binstringreversed); $i += 8) {
            $string = chr(getid3_lib::Bin2Dec(strrev(substr($binstringreversed, $i, 8)))).$string;
        }
        return $string;
    }


    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);
    }


    function array_merge_clobber($array1, $array2) {
        // written by kcØhireability*com
        // taken from http://www.php.net/manual/en/function.array-merge-recursive.php
        if (!is_array($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] = getid3_lib::array_merge_clobber($newarray[$key], $val);
            } else {
                $newarray[$key] = $val;
            }
        }
        return $newarray;
    }


    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] = getid3_lib::array_merge_noclobber($newarray[$key], $val);
            } elseif (!isset($newarray[$key])) {
                $newarray[$key] = $val;
            }
        }
        return $newarray;
    }


    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 '';
    }


    function PlaytimeString($playtimeseconds) {
        $sign = (($playtimeseconds < 0) ? '-' : '');
        $playtimeseconds = abs($playtimeseconds);
        $contentseconds = round((($playtimeseconds / 60) - floor($playtimeseconds / 60)) * 60);
        $contentminutes = floor($playtimeseconds / 60);
        if ($contentseconds >= 60) {
            $contentseconds -= 60;
            $contentminutes++;
        }
        return $sign.intval($contentminutes).':'.str_pad($contentseconds, 2, 0, STR_PAD_LEFT);
    }


    function image_type_to_mime_type($imagetypeid) {
        // only available in PHP v4.3.0+
        static $image_type_to_mime_type = array();
        if (empty($image_type_to_mime_type)) {
            $image_type_to_mime_type[1]  = 'image/gif';                     // GIF
            $image_type_to_mime_type[2]  = 'image/jpeg';                    // JPEG
            $image_type_to_mime_type[3]  = 'image/png';                     // PNG
            $image_type_to_mime_type[4]  = 'application/x-shockwave-flash'; // Flash
            $image_type_to_mime_type[5]  = 'image/psd';                     // PSD
            $image_type_to_mime_type[6]  = 'image/bmp';                     // BMP
            $image_type_to_mime_type[7]  = 'image/tiff';                    // TIFF: little-endian (Intel)
            $image_type_to_mime_type[8]  = 'image/tiff';                    // TIFF: big-endian (Motorola)
            //$image_type_to_mime_type[9]  = 'image/jpc';                   // JPC
            //$image_type_to_mime_type[10] = 'image/jp2';                   // JPC
            //$image_type_to_mime_type[11] = 'image/jpx';                   // JPC
            //$image_type_to_mime_type[12] = 'image/jb2';                   // JPC
            $image_type_to_mime_type[13] = 'application/x-shockwave-flash'; // Shockwave
            $image_type_to_mime_type[14] = 'image/iff';                     // IFF
        }
        return (isset($image_type_to_mime_type[$imagetypeid]) ? $image_type_to_mime_type[$imagetypeid] : 'application/octet-stream');
    }


    function DateMac2Unix($macdate) {
        // Macintosh timestamp: seconds since 00:00h January 1, 1904
        // UNIX timestamp:      seconds since 00:00h January 1, 1970
        return getid3_lib::CastAsInt($macdate - 2082844800);
    }


    function FixedPoint8_8($rawdata) {
        return getid3_lib::BigEndian2Int(substr($rawdata, 0, 1)) + (float) (getid3_lib::BigEndian2Int(substr($rawdata, 1, 1)) / pow(2, 8));
    }


    function FixedPoint16_16($rawdata) {
        return getid3_lib::BigEndian2Int(substr($rawdata, 0, 2)) + (float) (getid3_lib::BigEndian2Int(substr($rawdata, 2, 2)) / pow(2, 16));
    }


    function FixedPoint2_30($rawdata) {
        $binarystring = getid3_lib::BigEndian2Bin($rawdata);
        return getid3_lib::Bin2Dec(substr($binarystring, 0, 2)) + (float) (getid3_lib::Bin2Dec(substr($binarystring, 2, 30)) / 1073741824);
    }


    function CreateDeepArray($ArrayPath, $Separator, $Value) {
        // assigns $Value to a nested array path:
        //   $foo = getid3_lib::CreateDeepArray('/path/to/my', '/', 'file.txt')
        // is the same as:
        //   $foo = array('path'=>array('to'=>'array('my'=>array('file.txt'))));
        // or
        //   $foo['path']['to']['my'] = 'file.txt';
        while ($ArrayPath && ($ArrayPath{0} == $Separator)) {
            $ArrayPath = substr($ArrayPath, 1);
        }
        if (($pos = strpos($ArrayPath, $Separator)) !== false) {
            $ReturnedArray[substr($ArrayPath, 0, $pos)] = getid3_lib::CreateDeepArray(substr($ArrayPath, $pos + 1), $Separator, $Value);
        } else {
            $ReturnedArray[$ArrayPath] = $Value;
        }
        return $ReturnedArray;
    }

    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);
    }

    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);
    }


    function md5_file($file) {

        // md5_file() exists in PHP 4.2.0+.
        if (function_exists('md5_file')) {
            return md5_file($file);
        }

        if (GETID3_OS_ISWINDOWS) {

            $RequiredFiles = array('cygwin1.dll', 'md5sum.exe');
            foreach ($RequiredFiles as $required_file) {
                if (!is_readable(GETID3_HELPERAPPSDIR.$required_file)) {
                    die(implode(' and ', $RequiredFiles).' are required in '.GETID3_HELPERAPPSDIR.' for getid3_lib::md5_file() to function under Windows in PHP < v4.2.0');
                }
            }
            $commandline = GETID3_HELPERAPPSDIR.'md5sum.exe "'.str_replace('/', DIRECTORY_SEPARATOR, $file).'"';
            if (ereg("^[\\]?([0-9a-f]{32})", strtolower(`$commandline`), $r)) {
                return $r[1];
            }

        } else {

            // The following works under UNIX only
            $file = str_replace('`', '\\`', $file);
            if (ereg("^([0-9a-f]{32})[ \t\n\r]", `md5sum "$file"`, $r)) {
                return $r[1];
            }

        }
        return false;
    }


    function sha1_file($file) {

        // sha1_file() exists in PHP 4.3.0+.
        if (function_exists('sha1_file')) {
            return sha1_file($file);
        }

        $file = str_replace('`', '\\`', $file);

        if (GETID3_OS_ISWINDOWS) {

            $RequiredFiles = array('cygwin1.dll', 'sha1sum.exe');
            foreach ($RequiredFiles as $required_file) {
                if (!is_readable(GETID3_HELPERAPPSDIR.$required_file)) {
                    die(implode(' and ', $RequiredFiles).' are required in '.GETID3_HELPERAPPSDIR.' for getid3_lib::sha1_file() to function under Windows in PHP < v4.3.0');
                }
            }
            $commandline = GETID3_HELPERAPPSDIR.'sha1sum.exe "'.str_replace('/', DIRECTORY_SEPARATOR, $file).'"';
            if (ereg("^sha1=([0-9a-f]{40})", strtolower(`$commandline`), $r)) {
                return $r[1];
            }

        } else {

            $commandline = 'sha1sum '.escapeshellarg($file).'';
            if (ereg("^([0-9a-f]{40})[ \t\n\r]", strtolower(`$commandline`), $r)) {
                return $r[1];
            }

        }

        return false;
    }


    // Allan Hansen <ahØartemis*dk>
    // getid3_lib::md5_data() - returns md5sum for a file from startuing position to absolute end position
    function hash_data($file, $offset, $end, $algorithm) {
        if ($end >= pow(2, 31)) {
            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:
                die('Invalid algorithm ('.$algorithm.') in getid3_lib::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;
                    }
                }
                $commandline  = GETID3_HELPERAPPSDIR.'head.exe -c '.$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 ((bool) ini_get('safe_mode')) {
                $ThisFileInfo['warning'][] = 'PHP running in Safe Mode - backtick operator not available, using slower non-system-call '.$algorithm.' algorithm';
                break;
            }
            return substr(`$commandline`, 0, $hash_length);
        }

        // try to create a temporary file in the system temp directory - invalid dirname should force to system temp dir
        if (($data_filename = tempnam('*', 'getID3')) === false) {
            // can't find anywhere to create a temp file, just die
            return false;
        }

        // Init
        $result = false;

        // copy parts of file
        if ($fp = @fopen($file, 'rb')) {

            if ($fp_data = @fopen($data_filename, 'wb')) {

                fseek($fp, $offset, SEEK_SET);
                $byteslefttowrite = $end - $offset;
                while (($byteslefttowrite > 0) && ($buffer = fread($fp, GETID3_FREAD_BUFFER_SIZE))) {
                    $byteswritten = fwrite($fp_data, $buffer, $byteslefttowrite);
                    $byteslefttowrite -= $byteswritten;
                }
                fclose($fp_data);
                $result = getid3_lib::$hash_function($data_filename);

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


    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
    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});
            $newcharstring .= getid3_lib::iconv_fallback_int_utf8($charval);
        }
        return $newcharstring;
    }

    // ISO-8859-1 => UTF-16BE
    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
    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)
    function iconv_fallback_iso88591_utf16($string) {
        return getid3_lib::iconv_fallback_iso88591_utf16le($string, true);
    }

    // UTF-8 => ISO-8859-1
    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
    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) ? getid3_lib::BigEndian2String($charval, 2) : "\x00".'?');
            }
        }
        return $newcharstring;
    }

    // UTF-8 => UTF-16LE
    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) ? getid3_lib::LittleEndian2String($charval, 2) : '?'."\x00");
            }
        }
        return $newcharstring;
    }

    // UTF-8 => UTF-16LE (BOM)
    function iconv_fallback_utf8_utf16($string) {
        return getid3_lib::iconv_fallback_utf8_utf16le($string, true);
    }

    // UTF-16BE => UTF-8
    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) {
            $charval = getid3_lib::BigEndian2Int(substr($string, $i, 2));
            $newcharstring .= getid3_lib::iconv_fallback_int_utf8($charval);
        }
        return $newcharstring;
    }

    // UTF-16LE => UTF-8
    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) {
            $charval = getid3_lib::LittleEndian2Int(substr($string, $i, 2));
            $newcharstring .= getid3_lib::iconv_fallback_int_utf8($charval);
        }
        return $newcharstring;
    }

    // UTF-16BE => ISO-8859-1
    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) {
            $charval = getid3_lib::BigEndian2Int(substr($string, $i, 2));
            $newcharstring .= (($charval < 256) ? chr($charval) : '?');
        }
        return $newcharstring;
    }

    // UTF-16LE => ISO-8859-1
    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) {
            $charval = getid3_lib::LittleEndian2Int(substr($string, $i, 2));
            $newcharstring .= (($charval < 256) ? chr($charval) : '?');
        }
        return $newcharstring;
    }

    // UTF-16 (BOM) => ISO-8859-1
    function iconv_fallback_utf16_iso88591($string) {
        $bom = substr($string, 0, 2);
        if ($bom == "\xFE\xFF") {
            return getid3_lib::iconv_fallback_utf16be_iso88591(substr($string, 2));
        } elseif ($bom == "\xFF\xFE") {
            return getid3_lib::iconv_fallback_utf16le_iso88591(substr($string, 2));
        }
        return $string;
    }

    // UTF-16 (BOM) => UTF-8
    function iconv_fallback_utf16_utf8($string) {
        $bom = substr($string, 0, 2);
        if ($bom == "\xFE\xFF") {
            return getid3_lib::iconv_fallback_utf16be_utf8(substr($string, 2));
        } elseif ($bom == "\xFF\xFE") {
            return getid3_lib::iconv_fallback_utf16le_utf8(substr($string, 2));
        }
        return $string;
    }

    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($out_charset)];
            return getid3_lib::$ConversionFunction($string);
        }
        die('PHP does not have iconv() support - cannot convert from '.$in_charset.' to '.$out_charset);
    }


    function MultiByteCharString2HTML($string, $charset='ISO-8859-1') {
        $HTMLstring = '';

        switch ($charset) {
            case 'ISO-8859-1':
            case 'ISO8859-1':
            case 'ISO-8859-15':
            case 'ISO8859-15':
            case 'cp866':
            case 'ibm866':
            case '866':
            case 'cp1251':
            case 'Windows-1251':
            case 'win-1251':
            case '1251':
            case 'cp1252':
            case 'Windows-1252':
            case '1252':
            case 'KOI8-R':
            case 'koi8-ru':
            case 'koi8r':
            case 'BIG5':
            case '950':
            case 'GB2312':
            case '936':
            case 'BIG5-HKSCS':
            case 'Shift_JIS':
            case 'SJIS':
            case '932':
            case 'EUC-JP':
            case 'EUCJP':
                $HTMLstring = htmlentities($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) {
                    $charval = getid3_lib::LittleEndian2Int(substr($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) {
                    $charval = getid3_lib::BigEndian2Int(substr($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;
    }



    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] : '');
    }


    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] : '');
    }


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


    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;
    }

    function RGADamplitude2dB($amplitude) {
        return 20 * log10($amplitude);
    }


    function GetDataImageSize($imgData, &$imageinfo) {
        $GetDataImageSize = false;
        if ($tempfilename = tempnam('*', 'getID3')) {
            if ($tmp = @fopen($tempfilename, 'wb')) {
                fwrite($tmp, $imgData);
                fclose($tmp);
                $GetDataImageSize = @GetImageSize($tempfilename, $imageinfo);
            }
            unlink($tempfilename);
        }
        return $GetDataImageSize;
    }

    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] : '');
    }

    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;
                                    }
                                }

                            } else {

                                $newvaluelength = strlen(trim($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 (empty($ThisFileInfo['comments'][$tagname]) || !in_array(trim($value), $ThisFileInfo['comments'][$tagname])) {
                                $ThisFileInfo['comments'][$tagname][] = trim($value);
                            }
                        }
                    }
                }
            }

            // Copy to ['comments_html']
            foreach ($ThisFileInfo['comments'] as $field => $values) {
                foreach ($values as $index => $value) {
                    $ThisFileInfo['comments_html'][$field][$index] = str_replace('&#0;', '', getid3_lib::MultiByteCharString2HTML($value, $ThisFileInfo['encoding']));
                }
            }
        }
    }


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

        // Cached
        static $cache;
        if (isset($cache[$file][$name])) {
            return @$cache[$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, $keylength + 1));
            @list($ThisKey, $ThisValue) = explode("\t", $line, 2);
            $cache[$file][$name][$ThisKey] = trim($ThisValue);
        }

        // Close and return
        fclose($fp);
        return @$cache[$file][$name][$key];
    }

    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) {
            die($diemessage);
        } else {
            $GETID3_ERRORARRAY[] = $diemessage;
        }
        return false;
    }

}

?>