<?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 <= 1073741824) { // 2^30
                // 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) {

        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')) === fal