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File: includes/getid3/module.archive.gzip.php

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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: 2 years 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->fp, 0);
       
$buffer = fread($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_header, substr($buf, 0, $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_header, substr($buff, 0, $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, $fpointer, 2);
               
$xlen = getid3_lib::LittleEndian2Int($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 + $idx, 2);
                       
$xsublen = getid3_lib::LittleEndian2Int($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, $fpointer, 2);
               
$thisInfo['crc16'] = getid3_lib::LittleEndian2Int($w_crc);
               
$fpointer += 2;
            }
           
// bit 0 - FLG.FTEXT
            //if ($thisInfo['raw']['flags'] & 0x01) {
            // Ignored...
            //}
            // bits 5, 6, 7 - reserved

           
$thisInfo['crc32'] = getid3_lib::LittleEndian2Int(substr($buff, strlen($buff) - 8, 4));
           
$thisInfo['filesize'] = getid3_lib::LittleEndian2Int(substr($buff, strlen($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);
                   
$cdata = substr($cdata, 0, strlen($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
                   
$formattest = substr($inflated, 0, 32774);
                   
$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] : '');
    }
}

?>