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  Classes of Karl Holz  >  WaldScan  >  includes/getid3/module.archive.gzip.php  >  Download  
File: includes/getid3/module.archive.gzip.php
Role: Auxiliary script
Content type: text/plain
Description: getID3 dependency
Class: WaldScan
Scan directories for files with certain extensions
Author: By
Last change:
Date: 1 year ago
Size: 9,727 bytes
 

Contents

Class file image Download
<?php
/////////////////////////////////////////////////////////////////
/// getID3() by James Heinrich <info@getid3.org>               //
//  available at http://getid3.sourceforge.net                 //
//            or http://www.getid3.org                         //
/////////////////////////////////////////////////////////////////
// See readme.txt for more details                             //
/////////////////////////////////////////////////////////////////
//                                                             //
// module.archive.gzip.php                                     //
// module for analyzing GZIP files                             //
// dependencies: NONE                                          //
//                                                            ///
/////////////////////////////////////////////////////////////////
//                                                             //
// Module originally written by                                //
//      Mike Mozolin <teddybearØmail*ru>                       //
//                                                             //
/////////////////////////////////////////////////////////////////


class getid3_gzip extends getid3_handler {

    
// public: Optional file list - disable for speed.
    
var $option_gzip_parse_contents false// decode gzipped files, if possible, and parse recursively (.tar.gz for example)

    
function Analyze() {
        
$info = &$this->getid3->info;

        
$info['fileformat'] = 'gzip';

        
$start_length 10;
        
$unpack_header 'a1id1/a1id2/a1cmethod/a1flags/a4mtime/a1xflags/a1os';
        
//+---+---+---+---+---+---+---+---+---+---+
        //|ID1|ID2|CM |FLG|     MTIME     |XFL|OS |
        //+---+---+---+---+---+---+---+---+---+---+

        
if ($info['filesize'] > $info['php_memory_limit']) {
            
$info['error'][] = 'File is too large ('.number_format($info['filesize']).' bytes) to read into memory (limit: '.number_format($info['php_memory_limit'] / 1048576).'MB)';
            return 
false;
        }
        
fseek($this->getid3->fp0);
        
$buffer fread($this->getid3->fp$info['filesize']);

        
$arr_members explode("\x1F\x8B\x08"$buffer);
        while (
true) {
            
$is_wrong_members false;
            
$num_members intval(count($arr_members));
            for (
$i 0$i $num_members$i++) {
                if (
strlen($arr_members[$i]) == 0) {
                    continue;
                }
                
$buf "\x1F\x8B\x08".$arr_members[$i];

                
$attr unpack($unpack_headersubstr($buf0$start_length));
                if (!
$this->get_os_type(ord($attr['os']))) {
                    
// Merge member with previous if wrong OS type
                    
$arr_members[$i 1] .= $buf;
                    
$arr_members[$i] = '';
                    
$is_wrong_members true;
                    continue;
                }
            }
            if (!
$is_wrong_members) {
                break;
            }
        }

        
$info['gzip']['files'] = array();

        
$fpointer 0;
        
$idx 0;
        for (
$i 0$i $num_members$i++) {
            if (
strlen($arr_members[$i]) == 0) {
                continue;
            }
            
$thisInfo = &$info['gzip']['member_header'][++$idx];

            
$buff "\x1F\x8B\x08".$arr_members[$i];

            
$attr unpack($unpack_headersubstr($buff0$start_length));
            
$thisInfo['filemtime']      = getid3_lib::LittleEndian2Int($attr['mtime']);
            
$thisInfo['raw']['id1']     = ord($attr['cmethod']);
            
$thisInfo['raw']['id2']     = ord($attr['cmethod']);
            
$thisInfo['raw']['cmethod'] = ord($attr['cmethod']);
            
$thisInfo['raw']['os']      = ord($attr['os']);
            
$thisInfo['raw']['xflags']  = ord($attr['xflags']);
            
$thisInfo['raw']['flags']   = ord($attr['flags']);

            
$thisInfo['flags']['crc16']    = (bool) ($thisInfo['raw']['flags'] & 0x02);
            
$thisInfo['flags']['extra']    = (bool) ($thisInfo['raw']['flags'] & 0x04);
            
$thisInfo['flags']['filename'] = (bool) ($thisInfo['raw']['flags'] & 0x08);
            
$thisInfo['flags']['comment']  = (bool) ($thisInfo['raw']['flags'] & 0x10);

            
$thisInfo['compression'] = $this->get_xflag_type($thisInfo['raw']['xflags']);

            
$thisInfo['os'] = $this->get_os_type($thisInfo['raw']['os']);
            if (!
$thisInfo['os']) {
                
$info['error'][] = 'Read error on gzip file';
                return 
false;
            }

            
$fpointer 10;
            
$arr_xsubfield = array();
            
// bit 2 - FLG.FEXTRA
            //+---+---+=================================+
            //| XLEN  |...XLEN bytes of "extra field"...|
            //+---+---+=================================+
            
if ($thisInfo['flags']['extra']) {
                
$w_xlen substr($buff$fpointer2);
                
$xlen getid3_lib::LittleEndian2Int($w_xlen);
                
$fpointer += 2;

                
$thisInfo['raw']['xfield'] = substr($buff$fpointer$xlen);
                
// Extra SubFields
                //+---+---+---+---+==================================+
                //|SI1|SI2|  LEN  |... LEN bytes of subfield data ...|
                //+---+---+---+---+==================================+
                
$idx 0;
                while (
true) {
                    if (
$idx >= $xlen) {
                        break;
                    }
                    
$si1 ord(substr($buff$fpointer $idx++, 1));
                    
$si2 ord(substr($buff$fpointer $idx++, 1));
                    if ((
$si1 == 0x41) && ($si2 == 0x70)) {
                        
$w_xsublen substr($buff$fpointer $idx2);
                        
$xsublen getid3_lib::LittleEndian2Int($w_xsublen);
                        
$idx += 2;
                        
$arr_xsubfield[] = substr($buff$fpointer $idx$xsublen);
                        
$idx += $xsublen;
                    } else {
                        break;
                    }
                }
                
$fpointer += $xlen;
            }
            
// bit 3 - FLG.FNAME
            //+=========================================+
            //|...original file name, zero-terminated...|
            //+=========================================+
            // GZIP files may have only one file, with no filename, so assume original filename is current filename without .gz
            
$thisInfo['filename'] = preg_replace('#\.gz$#i'''$info['filename']);
            if (
$thisInfo['flags']['filename']) {
                while (
true) {
                    if (
ord($buff[$fpointer]) == 0) {
                        
$fpointer++;
                        break;
                    }
                    
$thisInfo['filename'] .= $buff[$fpointer];
                    
$fpointer++;
                }
            }
            
// bit 4 - FLG.FCOMMENT
            //+===================================+
            //|...file comment, zero-terminated...|
            //+===================================+
            
if ($thisInfo['flags']['comment']) {
                while (
true) {
                    if (
ord($buff[$fpointer]) == 0) {
                        
$fpointer++;
                        break;
                    }
                    
$thisInfo['comment'] .= $buff[$fpointer];
                    
$fpointer++;
                }
            }
            
// bit 1 - FLG.FHCRC
            //+---+---+
            //| CRC16 |
            //+---+---+
            
if ($thisInfo['flags']['crc16']) {
                
$w_crc substr($buff$fpointer2);
                
$thisInfo['crc16'] = getid3_lib::LittleEndian2Int($w_crc);
                
$fpointer += 2;
            }
            
// bit 0 - FLG.FTEXT
            //if ($thisInfo['raw']['flags'] & 0x01) {
            //    Ignored...
            //}
            // bits 5, 6, 7 - reserved

            
$thisInfo['crc32']    = getid3_lib::LittleEndian2Int(substr($buffstrlen($buff) - 84));
            
$thisInfo['filesize'] = getid3_lib::LittleEndian2Int(substr($buffstrlen($buff) - 4));

            
$info['gzip']['files'] = getid3_lib::array_merge_clobber($info['gzip']['files'], getid3_lib::CreateDeepArray($thisInfo['filename'], '/'$thisInfo['filesize']));

            if (
$this->option_gzip_parse_contents) {
                
// Try to inflate GZip
                
$csize 0;
                
$inflated '';
                
$chkcrc32 '';
                if (
function_exists('gzinflate')) {
                    
$cdata substr($buff$fpointer);
                    
$cdata substr($cdata0strlen($cdata) - 8);
                    
$csize strlen($cdata);
                    
$inflated gzinflate($cdata);

                    
// Calculate CRC32 for inflated content
                    
$thisInfo['crc32_valid'] = (bool) (sprintf('%u'crc32($inflated)) == $thisInfo['crc32']);

                    
// determine format
                    
$formattest substr($inflated032774);
                    
$getid3_temp = new getID3();
                    
$determined_format $getid3_temp->GetFileFormat($formattest);
                    unset(
$getid3_temp);

                    
// file format is determined
                    
$determined_format['module'] = (isset($determined_format['module']) ? $determined_format['module'] : '');
                    switch (
$determined_format['module']) {
                        case 
'tar':
                            
// view TAR-file info
                            
if (file_exists(GETID3_INCLUDEPATH.$determined_format['include']) && include_once(GETID3_INCLUDEPATH.$determined_format['include'])) {
                                if ((
$temp_tar_filename tempnam(GETID3_TEMP_DIR'getID3')) === false) {
                                    
// can't find anywhere to create a temp file, abort
                                    
$info['error'][] = 'Unable to create temp file to parse TAR inside GZIP file';
                                    break;
                                }
                                if (
$fp_temp_tar fopen($temp_tar_filename'w+b')) {
                                    
fwrite($fp_temp_tar$inflated);
                                    
fclose($fp_temp_tar);
                                    
$getid3_temp = new getID3();
                                    
$getid3_temp->openfile($temp_tar_filename);
                                    
$getid3_tar = new getid3_tar($getid3_temp);
                                    
$getid3_tar->Analyze();
                                    
$info['gzip']['member_header'][$idx]['tar'] = $getid3_temp->info['tar'];
                                    unset(
$getid3_temp$getid3_tar);
                                    
unlink($temp_tar_filename);
                                } else {
                                    
$info['error'][] = 'Unable to fopen() temp file to parse TAR inside GZIP file';
                                    break;
                                }
                            }
                            break;

                        case 
'':
                        default:
                            
// unknown or unhandled format
                            
break;
                    }
                }
            }
        }
        return 
true;
    }

    
// Converts the OS type
    
function get_os_type($key) {
        static 
$os_type = array(
            
'0'   => 'FAT filesystem (MS-DOS, OS/2, NT/Win32)',
            
'1'   => 'Amiga',
            
'2'   => 'VMS (or OpenVMS)',
            
'3'   => 'Unix',
            
'4'   => 'VM/CMS',
            
'5'   => 'Atari TOS',
            
'6'   => 'HPFS filesystem (OS/2, NT)',
            
'7'   => 'Macintosh',
            
'8'   => 'Z-System',
            
'9'   => 'CP/M',
            
'10'  => 'TOPS-20',
            
'11'  => 'NTFS filesystem (NT)',
            
'12'  => 'QDOS',
            
'13'  => 'Acorn RISCOS',
            
'255' => 'unknown'
        
);
        return (isset(
$os_type[$key]) ? $os_type[$key] : '');
    }

    
// Converts the eXtra FLags
    
function get_xflag_type($key) {
        static 
$xflag_type = array(
            
'0' => 'unknown',
            
'2' => 'maximum compression',
            
'4' => 'fastest algorithm'
        
);
        return (isset(
$xflag_type[$key]) ? $xflag_type[$key] : '');
    }
}

?>