Mercurial > judyates

     1 <?php

     2 // +----------------------------------------------------------------------+

     3 // | PHP version 5                                                        |

     4 // +----------------------------------------------------------------------+

     5 // | Copyright (c) 2002-2006 James Heinrich, Allan Hansen                 |

     6 // +----------------------------------------------------------------------+

     7 // | This source file is subject to version 2 of the GPL license,         |

     8 // | that is bundled with this package in the file license.txt and is     |

     9 // | available through the world-wide-web at the following url:           |

    10 // | http://www.gnu.org/copyleft/gpl.html                                 |

    11 // +----------------------------------------------------------------------+

    12 // | getID3() - http://getid3.sourceforge.net or http://www.getid3.org    |

    13 // +----------------------------------------------------------------------+

    14 // | Authors: James Heinrich <infoØgetid3*org>                            |

    15 // |          Allan Hansen <ahØartemis*dk>                                |

    16 // +----------------------------------------------------------------------+

    17 // | module.archive.gzip.php                                              |

    18 // | module for analyzing GZIP files                                      |

    19 // | dependencies: PHP compiled with zlib support (optional)              |

    20 // +----------------------------------------------------------------------+

    21 // | Module originally written by Mike Mozolin <teddybearØmail*ru>        |

    22 // +----------------------------------------------------------------------+

    23 //

    24 // $Id: module.archive.gzip.php,v 1.4 2006/12/04 16:00:35 ah Exp $

    25 

    26         

    27         

    28 class getid3_gzip extends getid3_handler

    29 {

    30 

    31     // public: Optional file list - disable for speed.

    32     public $option_gzip_parse_contents = true; // decode gzipped files, if possible, and parse recursively (.tar.gz for example)

    33 

    34     

    35     // Reads the gzip-file

    36     function Analyze() {

    37 

    38         $info = &$this->getid3->info;

    39 

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

    41 

    42         $start_length = 10;

    43         $unpack_header = 'a1id1/a1id2/a1cmethod/a1flags/a4mtime/a1xflags/a1os';

    44         

    45         //+---+---+---+---+---+---+---+---+---+---+

    46         //|ID1|ID2|CM |FLG|     MTIME     |XFL|OS |

    47         //+---+---+---+---+---+---+---+---+---+---+

    48         

    49         @fseek($this->getid3->fp, 0);

    50         $buffer = @fread($this->getid3->fp, $info['filesize']);

    51 

    52         $arr_members = explode("\x1F\x8B\x08", $buffer);

    53         

    54         while (true) {

    55             $is_wrong_members = false;

    56             $num_members = intval(count($arr_members));

    57             for ($i = 0; $i < $num_members; $i++) {

    58                 if (strlen($arr_members[$i]) == 0) {

    59                     continue;

    60                 }

    61                 $buf = "\x1F\x8B\x08".$arr_members[$i];

    62 

    63                 $attr = unpack($unpack_header, substr($buf, 0, $start_length));

    64                 if (!$this->get_os_type(ord($attr['os']))) {

    65         

    66                     // Merge member with previous if wrong OS type

    67                     $arr_members[$i - 1] .= $buf;

    68                     $arr_members[$i] = '';

    69                     $is_wrong_members = true;

    70                     continue;

    71                 }

    72             }

    73             if (!$is_wrong_members) {

    74                 break;

    75             }

    76         }

    77 

    78         $fpointer = 0;

    79         $idx = 0;

    80         for ($i = 0; $i < $num_members; $i++) {

    81             if (strlen($arr_members[$i]) == 0) {

    82                 continue;

    83             }

    84             $info_gzip_member_header_idx = &$info['gzip']['member_header'][++$idx];

    85 

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

    87 

    88             $attr = unpack($unpack_header, substr($buff, 0, $start_length));

    89             $info_gzip_member_header_idx['filemtime']      = getid3_lib::LittleEndian2Int($attr['mtime']);

    90             $info_gzip_member_header_idx['raw']['id1']     = ord($attr['cmethod']);

    91             $info_gzip_member_header_idx['raw']['id2']     = ord($attr['cmethod']);

    92             $info_gzip_member_header_idx['raw']['cmethod'] = ord($attr['cmethod']);

    93             $info_gzip_member_header_idx['raw']['os']      = ord($attr['os']);

    94             $info_gzip_member_header_idx['raw']['xflags']  = ord($attr['xflags']);

    95             $info_gzip_member_header_idx['raw']['flags']   = ord($attr['flags']);

    96 

    97             $info_gzip_member_header_idx['flags']['crc16']    = (bool) ($info_gzip_member_header_idx['raw']['flags'] & 0x02);

    98             $info_gzip_member_header_idx['flags']['extra']    = (bool) ($info_gzip_member_header_idx['raw']['flags'] & 0x04);

    99             $info_gzip_member_header_idx['flags']['filename'] = (bool) ($info_gzip_member_header_idx['raw']['flags'] & 0x08);

   100             $info_gzip_member_header_idx['flags']['comment']  = (bool) ($info_gzip_member_header_idx['raw']['flags'] & 0x10);

   101 

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

   103 

   104             $info_gzip_member_header_idx['os'] = $this->get_os_type($info_gzip_member_header_idx['raw']['os']);

   105             if (!$info_gzip_member_header_idx['os']) {

   106                 $info['error'][] = 'Read error on gzip file';

   107                 return false;

   108             }

   109 

   110             $fpointer = 10;

   111             $arr_xsubfield = array ();

   112             

   113             // bit 2 - FLG.FEXTRA

   114             //+---+---+=================================+

   115             //| XLEN  |...XLEN bytes of "extra field"...|

   116             //+---+---+=================================+

   117             

   118             if ($info_gzip_member_header_idx['flags']['extra']) {

   119                 $w_xlen = substr($buff, $fpointer, 2);

   120                 $xlen = getid3_lib::LittleEndian2Int($w_xlen);

   121                 $fpointer += 2;

   122 

   123                 $info_gzip_member_header_idx['raw']['xfield'] = substr($buff, $fpointer, $xlen);

   124             

   125                 // Extra SubFields

   126                 //+---+---+---+---+==================================+

   127                 //|SI1|SI2|  LEN  |... LEN bytes of subfield data ...|

   128                 //+---+---+---+---+==================================+

   129             

   130                 $idx = 0;

   131                 while (true) {

   132                     if ($idx >= $xlen) {

   133                         break;

   134                     }

   135                     $si1 = ord(substr($buff, $fpointer + $idx++, 1));

   136                     $si2 = ord(substr($buff, $fpointer + $idx++, 1));

   137                     if (($si1 == 0x41) && ($si2 == 0x70)) {

   138                         $w_xsublen = substr($buff, $fpointer+$idx, 2);

   139                         $xsublen = getid3_lib::LittleEndian2Int($w_xsublen);

   140                         $idx += 2;

   141                         $arr_xsubfield[] = substr($buff, $fpointer+$idx, $xsublen);

   142                         $idx += $xsublen;

   143                     } else {

   144                         break;

   145                     }

   146                 }

   147                 $fpointer += $xlen;

   148             }

   149             

   150             // bit 3 - FLG.FNAME

   151             //+=========================================+

   152             //|...original file name, zero-terminated...|

   153             //+=========================================+

   154             // GZIP files may have only one file, with no filename, so assume original filename is current filename without .gz

   155             

   156             $info_gzip_member_header_idx['filename'] = eregi_replace('.gz$', '', @$info['filename']);

   157             if ($info_gzip_member_header_idx['flags']['filename']) {

   158                 while (true) {

   159                     if (ord($buff[$fpointer]) == 0) {

   160                         $fpointer++;

   161                         break;

   162                     }

   163                     $info_gzip_member_header_idx['filename'] .= $buff[$fpointer];

   164                     $fpointer++;

   165                 }

   166             }

   167             

   168             // bit 4 - FLG.FCOMMENT

   169             //+===================================+

   170             //|...file comment, zero-terminated...|

   171             //+===================================+

   172             

   173             if ($info_gzip_member_header_idx['flags']['comment']) {

   174                 while (true) {

   175                     if (ord($buff[$fpointer]) == 0) {

   176                         $fpointer++;

   177                         break;

   178                     }

   179                     $info_gzip_member_header_idx['comment'] .= $buff[$fpointer];

   180                     $fpointer++;

   181                 }

   182             }

   183             

   184             // bit 1 - FLG.FHCRC

   185             //+---+---+

   186             //| CRC16 |

   187             //+---+---+

   188             

   189             if ($info_gzip_member_header_idx['flags']['crc16']) {

   190                 $w_crc = substr($buff, $fpointer, 2);

   191                 $info_gzip_member_header_idx['crc16'] = getid3_lib::LittleEndian2Int($w_crc);

   192                 $fpointer += 2;

   193             }

   194             

   195             // bit 0 - FLG.FTEXT

   196             //if ($info_gzip_member_header_idx['raw']['flags'] & 0x01) {

   197             //  Ignored...

   198             //}

   199             // bits 5, 6, 7 - reserved

   200 

   201             $info_gzip_member_header_idx['crc32']    = getid3_lib::LittleEndian2Int(substr($buff, strlen($buff) - 8, 4));

   202             $info_gzip_member_header_idx['filesize'] = getid3_lib::LittleEndian2Int(substr($buff, strlen($buff) - 4));

   203 

   204             if ($this->option_gzip_parse_contents) {

   205 

   206                 // Try to inflate GZip

   207                 

   208                 if (!function_exists('gzinflate')) {

   209                     $this->getid3->warning('PHP does not have zlib support - contents not parsed.');

   210                     return true;

   211                 }

   212 

   213                 $csize = 0;

   214                 $inflated = '';

   215                 $chkcrc32 = '';

   216 

   217                 $cdata = substr($buff, $fpointer);

   218                 $cdata = substr($cdata, 0, strlen($cdata) - 8);

   219                 $csize = strlen($cdata);

   220                 $inflated = gzinflate($cdata);

   221 

   222                 // Calculate CRC32 for inflated content

   223                 $info_gzip_member_header_idx['crc32_valid'] = (bool) (sprintf('%u', crc32($inflated)) == $info_gzip_member_header_idx['crc32']);

   224 

   225                 

   226                 //// Analyse contents

   227                 

   228                 // write content to temp file

   229                 if (($temp_file_name = tempnam('*', 'getID3'))  === false) {

   230                     throw new getid3_exception('Unable to create temporary file.');

   231                 }

   232 

   233                 if ($tmp = fopen($temp_file_name, 'wb')) {

   234                     fwrite($tmp, $inflated);

   235                     fclose($tmp);

   236                     

   237                     // clone getid3 - we want same settings

   238                     $clone = clone $this->getid3;

   239                     unset($clone->info);

   240                     try {

   241                         $clone->Analyze($temp_file_name);

   242                         $info_gzip_member_header_idx['parsed_content'] = $clone->info;

   243                     }

   244                     catch (getid3_exception $e) {

   245                         // unable to parse contents

   246                     }

   247                     

   248                     unlink($temp_file_name);

   249                 }

   250             

   251                 // Unknown/unhandled format 

   252                 else {

   253                                         

   254                 }

   255             }

   256         }

   257         return true;

   258     }

   259 

   260 

   261     // Converts the OS type

   262     public static function get_os_type($key) {

   263         static $os_type = array (

   264             '0'   => 'FAT filesystem (MS-DOS, OS/2, NT/Win32)',

   265             '1'   => 'Amiga',

   266             '2'   => 'VMS (or OpenVMS)',

   267             '3'   => 'Unix',

   268             '4'   => 'VM/CMS',

   269             '5'   => 'Atari TOS',

   270             '6'   => 'HPFS filesystem (OS/2, NT)',

   271             '7'   => 'Macintosh',

   272             '8'   => 'Z-System',

   273             '9'   => 'CP/M',

   274             '10'  => 'TOPS-20',

   275             '11'  => 'NTFS filesystem (NT)',

   276             '12'  => 'QDOS',

   277             '13'  => 'Acorn RISCOS',

   278             '255' => 'unknown'

   279         );

   280         return @$os_type[$key];

   281     }

   282 

   283 

   284     // Converts the eXtra FLags

   285     public static function get_xflag_type($key) {

   286         static $xflag_type = array (

   287             '0' => 'unknown',

   288             '2' => 'maximum compression',

   289             '4' => 'fastest algorithm'

   290         );

   291         return @$xflag_type[$key];

   292     }

   293     

   294 }

   295 

   296 ?>
author	Robert McIntyre <rlm@mit.edu>
date	Tue, 22 Jun 2010 13:41:04 -0400
parents	3f6b44aa6b35
children