/common/libraries/plugin/getid3/getid3.lib.php

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<?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 kc�hireability*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 <ah�artemis*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 ($…