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IEContentAnalyzer.php
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<?php /** * Simulation of Microsoft Internet Explorer's MIME type detection algorithm. * * @file * @todo Define the exact license of this file. */ /** * This class simulates Microsoft Internet Explorer's terribly broken and * insecure MIME type detection algorithm. It can be used to check web uploads * with an apparently safe type, to see if IE will reinterpret them to produce * something dangerous. * * It is full of bugs and strange design choices should not under any * circumstances be used to determine a MIME type to present to a user or * client. (Apple Safari developers, this means you too.) * * This class is based on a disassembly of IE 5.0, 6.0 and 7.0. Although I have * attempted to ensure that this code works in exactly the same way as Internet * Explorer, it does not share any source code, or creative choices such as * variable names, thus I (Tim Starling) claim copyright on it. * * It may be redistributed without restriction. To aid reuse, this class does * not depend on any MediaWiki module. */ class IEContentAnalyzer { /** * Relevant data taken from the type table in IE 5 */ protected $baseTypeTable = [ 'ambiguous' /*1*/ => [ 'text/plain', 'application/octet-stream', 'application/x-netcdf', // [sic] ], 'text' /*3*/ => [ 'text/richtext', 'image/x-bitmap', 'application/postscript', 'application/base64', 'application/macbinhex40', 'application/x-cdf', 'text/scriptlet' ], 'binary' /*4*/ => [ 'application/pdf', 'audio/x-aiff', 'audio/basic', 'audio/wav', 'image/gif', 'image/pjpeg', 'image/jpeg', 'image/tiff', 'image/x-png', 'image/png', 'image/bmp', 'image/x-jg', 'image/x-art', 'image/x-emf', 'image/x-wmf', 'video/avi', 'video/x-msvideo', 'video/mpeg', 'application/x-compressed', 'application/x-zip-compressed', 'application/x-gzip-compressed', 'application/java', 'application/x-msdownload' ], 'html' /*5*/ => [ 'text/html' ], ]; /** * Changes to the type table in later versions of IE */ protected $addedTypes = [ 'ie07' => [ 'text' => [ 'text/xml', 'application/xml' ] ], ]; /** * An approximation of the "Content Type" values in HKEY_CLASSES_ROOT in a * typical Windows installation. * * Used for extension to MIME type mapping if detection fails. */ protected $registry = [ '.323' => 'text/h323', '.3g2' => 'video/3gpp2', '.3gp' => 'video/3gpp', '.3gp2' => 'video/3gpp2', '.3gpp' => 'video/3gpp', '.aac' => 'audio/aac', '.ac3' => 'audio/ac3', '.accda' => 'application/msaccess', '.accdb' => 'application/msaccess', '.accdc' => 'application/msaccess', '.accde' => 'application/msaccess', '.accdr' => 'application/msaccess', '.accdt' => 'application/msaccess', '.ade' => 'application/msaccess', '.adp' => 'application/msaccess', '.adts' => 'audio/aac', '.ai' => 'application/postscript', '.aif' => 'audio/aiff', '.aifc' => 'audio/aiff', '.aiff' => 'audio/aiff', '.amc' => 'application/x-mpeg', '.application' => 'application/x-ms-application', '.asf' => 'video/x-ms-asf', '.asx' => 'video/x-ms-asf', '.au' => 'audio/basic', '.avi' => 'video/avi', '.bmp' => 'image/bmp', '.caf' => 'audio/x-caf', '.cat' => 'application/vnd.ms-pki.seccat', '.cbo' => 'application/sha', '.cdda' => 'audio/aiff', '.cer' => 'application/x-x509-ca-cert', '.conf' => 'text/plain', '.crl' => 'application/pkix-crl', '.crt' => 'application/x-x509-ca-cert', '.css' => 'text/css', '.csv' => 'application/vnd.ms-excel', '.der' => 'application/x-x509-ca-cert', '.dib' => 'image/bmp', '.dif' => 'video/x-dv', '.dll' => 'application/x-msdownload', '.doc' => 'application/msword', '.docm' => 'application/vnd.ms-word.document.macroEnabled.12', '.docx' => 'application/vnd.openxmlformats-officedocument.wordprocessingml.document', '.dot' => 'application/msword', '.dotm' => 'application/vnd.ms-word.template.macroEnabled.12', '.dotx' => 'application/vnd.openxmlformats-officedocument.wordprocessingml.template', '.dv' => 'video/x-dv', '.dwfx' => 'model/vnd.dwfx+xps', '.edn' => 'application/vnd.adobe.edn', '.eml' => 'message/rfc822', '.eps' => 'application/postscript', '.etd' => 'application/x-ebx', '.exe' => 'application/x-msdownload', '.fdf' => 'application/vnd.fdf', '.fif' => 'application/fractals', '.gif' => 'image/gif', '.gsm' => 'audio/x-gsm', '.hqx' => 'application/mac-binhex40', '.hta' => 'application/hta', '.htc' => 'text/x-component', '.htm' => 'text/html', '.html' => 'text/html', '.htt' => 'text/webviewhtml', '.hxa' => 'application/xml', '.hxc' => 'application/xml', '.hxd' => 'application/octet-stream', '.hxe' => 'application/xml', '.hxf' => 'application/xml', '.hxh' => 'application/octet-stream', '.hxi' => 'application/octet-stream', '.hxk' => 'application/xml', '.hxq' => 'application/octet-stream', '.hxr' => 'application/octet-stream', '.hxs' => 'application/octet-stream', '.hxt' => 'application/xml', '.hxv' => 'application/xml', '.hxw' => 'application/octet-stream', '.ico' => 'image/x-icon', '.iii' => 'application/x-iphone', '.ins' => 'application/x-internet-signup', '.iqy' => 'text/x-ms-iqy', '.isp' => 'application/x-internet-signup', '.jfif' => 'image/jpeg', '.jnlp' => 'application/x-java-jnlp-file', '.jpe' => 'image/jpeg', '.jpeg' => 'image/jpeg', '.jpg' => 'image/jpeg', '.jtx' => 'application/x-jtx+xps', '.latex' => 'application/x-latex', '.log' => 'text/plain', '.m1v' => 'video/mpeg', '.m2v' => 'video/mpeg', '.m3u' => 'audio/x-mpegurl', '.mac' => 'image/x-macpaint', '.man' => 'application/x-troff-man', '.mda' => 'application/msaccess', '.mdb' => 'application/msaccess', '.mde' => 'application/msaccess', '.mfp' => 'application/x-shockwave-flash', '.mht' => 'message/rfc822', '.mhtml' => 'message/rfc822', '.mid' => 'audio/mid', '.midi' => 'audio/mid', '.mod' => 'video/mpeg', '.mov' => 'video/quicktime', '.mp2' => 'video/mpeg', '.mp2v' => 'video/mpeg', '.mp3' => 'audio/mpeg', '.mp4' => 'video/mp4', '.mpa' => 'video/mpeg', '.mpe' => 'video/mpeg', '.mpeg' => 'video/mpeg', '.mpf' => 'application/vnd.ms-mediapackage', '.mpg' => 'video/mpeg', '.mpv2' => 'video/mpeg', '.mqv' => 'video/quicktime', '.NMW' => 'application/nmwb', '.nws' => 'message/rfc822', '.odc' => 'text/x-ms-odc', '.ols' => 'application/vnd.ms-publisher', '.p10' => 'application/pkcs10', '.p12' => 'application/x-pkcs12', '.p7b' => 'application/x-pkcs7-certificates', '.p7c' => 'application/pkcs7-mime', '.p7m' => 'application/pkcs7-mime', '.p7r' => 'application/x-pkcs7-certreqresp', '.p7s' => 'application/pkcs7-signature', '.pct' => 'image/pict', '.pdf' => 'application/pdf', '.pdx' => 'application/vnd.adobe.pdx', '.pfx' => 'application/x-pkcs12', '.pic' => 'image/pict', '.pict' => 'image/pict', '.pinstall' => 'application/x-picasa-detect', '.pko' => 'application/vnd.ms-pki.pko', '.png' => 'image/png', '.pnt' => 'image/x-macpaint', '.pntg' => 'image/x-macpaint', '.pot' => 'application/vnd.ms-powerpoint', '.potm' => 'application/vnd.ms-powerpoint.template.macroEnabled.12', '.potx' => 'application/vnd.openxmlformats-officedocument.presentationml.template', '.ppa' => 'application/vnd.ms-powerpoint', '.ppam' => 'application/vnd.ms-powerpoint.addin.macroEnabled.12', '.pps' => 'application/vnd.ms-powerpoint', '.ppsm' => 'application/vnd.ms-powerpoint.slideshow.macroEnabled.12', '.ppsx' => 'application/vnd.openxmlformats-officedocument.presentationml.slideshow', '.ppt' => 'application/vnd.ms-powerpoint', '.pptm' => 'application/vnd.ms-powerpoint.presentation.macroEnabled.12', '.pptx' => 'application/vnd.openxmlformats-officedocument.presentationml.presentation', '.prf' => 'application/pics-rules', '.ps' => 'application/postscript', '.pub' => 'application/vnd.ms-publisher', '.pwz' => 'application/vnd.ms-powerpoint', '.py' => 'text/plain', '.pyw' => 'text/plain', '.qht' => 'text/x-html-insertion', '.qhtm' => 'text/x-html-insertion', '.qt' => 'video/quicktime', '.qti' => 'image/x-quicktime', '.qtif' => 'image/x-quicktime', '.qtl' => 'application/x-quicktimeplayer', '.rat' => 'application/rat-file', '.rmf' => 'application/vnd.adobe.rmf', '.rmi' => 'audio/mid', '.rqy' => 'text/x-ms-rqy', '.rtf' => 'application/msword', '.sct' => 'text/scriptlet', '.sd2' => 'audio/x-sd2', '.sdp' => 'application/sdp', '.shtml' => 'text/html', '.sit' => 'application/x-stuffit', '.sldm' => 'application/vnd.ms-powerpoint.slide.macroEnabled.12', '.sldx' => 'application/vnd.openxmlformats-officedocument.presentationml.slide', '.slk' => 'application/vnd.ms-excel', '.snd' => 'audio/basic', '.so' => 'application/x-apachemodule', '.sol' => 'text/plain', '.sor' => 'text/plain', '.spc' => 'application/x-pkcs7-certificates', '.spl' => 'application/futuresplash', '.sst' => 'application/vnd.ms-pki.certstore', '.stl' => 'application/vnd.ms-pki.stl', '.swf' => 'application/x-shockwave-flash', '.thmx' => 'application/vnd.ms-officetheme', '.tif' => 'image/tiff', '.tiff' => 'image/tiff', '.txt' => 'text/plain', '.uls' => 'text/iuls', '.vcf' => 'text/x-vcard', '.vdx' => 'application/vnd.ms-visio.viewer', '.vsd' => 'application/vnd.ms-visio.viewer', '.vss' => 'application/vnd.ms-visio.viewer', '.vst' => 'application/vnd.ms-visio.viewer', '.vsx' => 'application/vnd.ms-visio.viewer', '.vtx' => 'application/vnd.ms-visio.viewer', '.wav' => 'audio/wav', '.wax' => 'audio/x-ms-wax', '.wbk' => 'application/msword', '.wdp' => 'image/vnd.ms-photo', '.wiz' => 'application/msword', '.wm' => 'video/x-ms-wm', '.wma' => 'audio/x-ms-wma', '.wmd' => 'application/x-ms-wmd', '.wmv' => 'video/x-ms-wmv', '.wmx' => 'video/x-ms-wmx', '.wmz' => 'application/x-ms-wmz', '.wpl' => 'application/vnd.ms-wpl', '.wsc' => 'text/scriptlet', '.wvx' => 'video/x-ms-wvx', '.xaml' => 'application/xaml+xml', '.xbap' => 'application/x-ms-xbap', '.xdp' => 'application/vnd.adobe.xdp+xml', '.xfdf' => 'application/vnd.adobe.xfdf', '.xht' => 'application/xhtml+xml', '.xhtml' => 'application/xhtml+xml', '.xla' => 'application/vnd.ms-excel', '.xlam' => 'application/vnd.ms-excel.addin.macroEnabled.12', '.xlk' => 'application/vnd.ms-excel', '.xll' => 'application/vnd.ms-excel', '.xlm' => 'application/vnd.ms-excel', '.xls' => 'application/vnd.ms-excel', '.xlsb' => 'application/vnd.ms-excel.sheet.binary.macroEnabled.12', '.xlsm' => 'application/vnd.ms-excel.sheet.macroEnabled.12', '.xlsx' => 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet', '.xlt' => 'application/vnd.ms-excel', '.xltm' => 'application/vnd.ms-excel.template.macroEnabled.12', '.xltx' => 'application/vnd.openxmlformats-officedocument.spreadsheetml.template', '.xlw' => 'application/vnd.ms-excel', '.xml' => 'text/xml', '.xps' => 'application/vnd.ms-xpsdocument', '.xsl' => 'text/xml', ]; /** * IE versions which have been analysed to bring you this class, and for * which some substantive difference exists. These will appear as keys * in the return value of getRealMimesFromData(). The names are chosen to sort correctly. */ protected $versions = [ 'ie05', 'ie06', 'ie07', 'ie07.strict', 'ie07.nohtml' ]; /** * Type table with versions expanded */ protected $typeTable = []; /** constructor */ function __construct() { // Construct versioned type arrays from the base type array plus additions $types = $this->baseTypeTable; foreach ( $this->versions as $version ) { if ( isset( $this->addedTypes[$version] ) ) { foreach ( $this->addedTypes[$version] as $format => $addedTypes ) { $types[$format] = array_merge( $types[$format], $addedTypes ); } } $this->typeTable[$version] = $types; } } /** * Get the MIME types from getMimesFromData(), but convert the result from IE's * idiosyncratic private types into something other apps will understand. * * @param string $fileName the file name (unused at present) * @param string $chunk the first 256 bytes of the file * @param string $proposed the MIME type proposed by the server * * @return Array: map of IE version to detected MIME type */ public function getRealMimesFromData( $fileName, $chunk, $proposed ) { $types = $this->getMimesFromData( $fileName, $chunk, $proposed ); $types = array_map( [ $this, 'translateMimeType' ], $types ); return $types; } /** * Translate a MIME type from IE's idiosyncratic private types into * more commonly understood type strings * @param $type * @return string */ public function translateMimeType( $type ) { static $table = [ 'image/pjpeg' => 'image/jpeg', 'image/x-png' => 'image/png', 'image/x-wmf' => 'application/x-msmetafile', 'image/bmp' => 'image/x-bmp', 'application/x-zip-compressed' => 'application/zip', 'application/x-compressed' => 'application/x-compress', 'application/x-gzip-compressed' => 'application/x-gzip', 'audio/mid' => 'audio/midi', ]; if ( isset( $table[$type] ) ) { $type = $table[$type]; } return $type; } /** * Get the untranslated MIME types for all known versions * * @param string $fileName the file name (unused at present) * @param string $chunk the first 256 bytes of the file * @param string $proposed the MIME type proposed by the server * * @return Array: map of IE version to detected MIME type */ public function getMimesFromData( $fileName, $chunk, $proposed ) { $types = []; foreach ( $this->versions as $version ) { $types[$version] = $this->getMimeTypeForVersion( $version, $fileName, $chunk, $proposed ); } return $types; } /** * Get the MIME type for a given named version * @param $version * @param $fileName * @param $chunk * @param $proposed * @return bool|string */ protected function getMimeTypeForVersion( $version, $fileName, $chunk, $proposed ) { // Strip text after a semicolon $semiPos = strpos( $proposed, ';' ); if ( $semiPos !== false ) { $proposed = substr( $proposed, 0, $semiPos ); } $proposedFormat = $this->getDataFormat( $version, $proposed ); if ( $proposedFormat == 'unknown' && $proposed != 'multipart/mixed' && $proposed != 'multipart/x-mixed-replace' ) { return $proposed; } if ( strval( $chunk ) === '' ) { return $proposed; } // Truncate chunk at 255 bytes $chunk = substr( $chunk, 0, 255 ); // IE does the Check*Headers() calls last, and instead does the following image // type checks by directly looking for the magic numbers. What I do here should // have the same effect since the magic number checks are identical in both cases. $result = $this->sampleData( $version, $chunk ); $sampleFound = $result['found']; $counters = $result['counters']; $binaryType = $this->checkBinaryHeaders( $version, $chunk ); $textType = $this->checkTextHeaders( $version, $chunk ); if ( $proposed == 'text/html' && isset( $sampleFound['html'] ) ) { return 'text/html'; } if ( $proposed == 'image/gif' && $binaryType == 'image/gif' ) { return 'image/gif'; } if ( ( $proposed == 'image/pjpeg' || $proposed == 'image/jpeg' ) && $binaryType == 'image/pjpeg' ) { return $proposed; } // PNG check added in IE 7 if ( $version >= 'ie07' && ( $proposed == 'image/x-png' || $proposed == 'image/png' ) && $binaryType == 'image/x-png' ) { return $proposed; } // CDF was removed in IE 7 so it won't be in $sampleFound for later versions if ( isset( $sampleFound['cdf'] ) ) { return 'application/x-cdf'; } // RSS and Atom were added in IE 7 so they won't be in $sampleFound for // previous versions if ( isset( $sampleFound['rss'] ) ) { return 'application/rss+xml'; } if ( isset( $sampleFound['rdf-tag'] ) && isset( $sampleFound['rdf-url'] ) && isset( $sampleFound['rdf-purl'] ) ) { return 'application/rss+xml'; } if ( isset( $sampleFound['atom'] ) ) { return 'application/atom+xml'; } if ( isset( $sampleFound['xml'] ) ) { // TODO: I'm not sure under what circumstances this flag is enabled if ( strpos( $version, 'strict' ) !== false ) { if ( $proposed == 'text/html' || $proposed == 'text/xml' ) { return 'text/xml'; } } else { return 'text/xml'; } } if ( isset( $sampleFound['html'] ) ) { // TODO: I'm not sure under what circumstances this flag is enabled if ( strpos( $version, 'nohtml' ) !== false ) { if ( $proposed == 'text/plain' ) { return 'text/html'; } } else { return 'text/html'; } } if ( isset( $sampleFound['xbm'] ) ) { return 'image/x-bitmap'; } if ( isset( $sampleFound['binhex'] ) ) { return 'application/macbinhex40'; } if ( isset( $sampleFound['scriptlet'] ) ) { if ( strpos( $version, 'strict' ) !== false ) { if ( $proposed == 'text/plain' || $proposed == 'text/scriptlet' ) { return 'text/scriptlet'; } } else { return 'text/scriptlet'; } } // Freaky heuristics to determine if the data is text or binary // The heuristic is of course broken for non-ASCII text if ( $counters['ctrl'] != 0 && ( $counters['ff'] + $counters['low'] ) < ( $counters['ctrl'] + $counters['high'] ) * 16 ) { $kindOfBinary = true; $type = $binaryType ? $binaryType : $textType; if ( $type === false ) { $type = 'application/octet-stream'; } } else { $kindOfBinary = false; $type = $textType ? $textType : $binaryType; if ( $type === false ) { $type = 'text/plain'; } } // Check if the output format is ambiguous // This generally means that detection failed, real types aren't ambiguous $detectedFormat = $this->getDataFormat( $version, $type ); if ( $detectedFormat != 'ambiguous' ) { return $type; } if ( $proposedFormat != 'ambiguous' ) { // FormatAgreesWithData() if ( $proposedFormat == 'text' && !$kindOfBinary ) { return $proposed; } if ( $proposedFormat == 'binary' && $kindOfBinary ) { return $proposed; } if ( $proposedFormat == 'html' ) { return $proposed; } } // Find a MIME type by searching the registry for the file extension. $dotPos = strrpos( $fileName, '.' ); if ( $dotPos === false ) { return $type; } $ext = substr( $fileName, $dotPos ); if ( isset( $this->registry[$ext] ) ) { return $this->registry[$ext]; } // TODO: If the extension has an application registered to it, IE will return // application/octet-stream. We'll skip that, so we could erroneously // return text/plain or application/x-netcdf where application/octet-stream // would be correct. return $type; } /** * Check for text headers at the start of the chunk * Confirmed same in 5 and 7. * @param $version * @param $chunk * @return bool|string */ private function checkTextHeaders( $version, $chunk ) { $chunk2 = substr( $chunk, 0, 2 ); $chunk4 = substr( $chunk, 0, 4 ); $chunk5 = substr( $chunk, 0, 5 ); if ( $chunk4 == '%PDF' ) { return 'application/pdf'; } if ( $chunk2 == '%!' ) { return 'application/postscript'; } if ( $chunk5 == '{\\rtf' ) { return 'text/richtext'; } if ( $chunk5 == 'begin' ) { return 'application/base64'; } return false; } /** * Check for binary headers at the start of the chunk * Confirmed same in 5 and 7. * @param $version * @param $chunk * @return bool|string */ private function checkBinaryHeaders( $version, $chunk ) { $chunk2 = substr( $chunk, 0, 2 ); $chunk3 = substr( $chunk, 0, 3 ); $chunk4 = substr( $chunk, 0, 4 ); $chunk5 = substr( $chunk, 0, 5 ); $chunk5uc = strtoupper( $chunk5 ); $chunk8 = substr( $chunk, 0, 8 ); if ( $chunk5uc == 'GIF87' || $chunk5uc == 'GIF89' ) { return 'image/gif'; } if ( $chunk2 == "\xff\xd8" ) { return 'image/pjpeg'; // actually plain JPEG but this is what IE returns } if ( $chunk2 == 'BM' && substr( $chunk, 6, 2 ) == "\000\000" && substr( $chunk, 8, 2 ) == "\000\000" ) { return 'image/bmp'; // another non-standard MIME } if ( $chunk4 == 'RIFF' && substr( $chunk, 8, 4 ) == 'WAVE' ) { return 'audio/wav'; } // These were integer literals in IE // Perhaps the author was not sure what the target endianness was if ( $chunk4 == ".sd\000" || $chunk4 == ".snd" || $chunk4 == "\000ds." || $chunk4 == "dns." ) { return 'audio/basic'; } if ( $chunk3 == "MM\000" ) { return 'image/tiff'; } if ( $chunk2 == 'MZ' ) { return 'application/x-msdownload'; } if ( $chunk8 == "\x89PNG\x0d\x0a\x1a\x0a" ) { return 'image/x-png'; // [sic] } if ( strlen( $chunk ) >= 5 ) { $byte2 = ord( $chunk[2] ); $byte4 = ord( $chunk[4] ); if ( $byte2 >= 3 && $byte2 <= 31 && $byte4 == 0 && $chunk2 == 'JG' ) { return 'image/x-jg'; } } // More endian confusion? if ( $chunk4 == 'MROF' ) { return 'audio/x-aiff'; } $chunk4_8 = substr( $chunk, 8, 4 ); if ( $chunk4 == 'FORM' && ( $chunk4_8 == 'AIFF' || $chunk4_8 == 'AIFC' ) ) { return 'audio/x-aiff'; } if ( $chunk4 == 'RIFF' && $chunk4_8 == 'AVI ' ) { return 'video/avi'; } if ( $chunk4 == "\x00\x00\x01\xb3" || $chunk4 == "\x00\x00\x01\xba" ) { return 'video/mpeg'; } if ( $chunk4 == "\001\000\000\000" && substr( $chunk, 40, 4 ) == ' EMF' ) { return 'image/x-emf'; } if ( $chunk4 == "\xd7\xcd\xc6\x9a" ) { return 'image/x-wmf'; } if ( $chunk4 == "\xca\xfe\xba\xbe" ) { return 'application/java'; } if ( $chunk2 == 'PK' ) { return 'application/x-zip-compressed'; } if ( $chunk2 == "\x1f\x9d" ) { return 'application/x-compressed'; } if ( $chunk2 == "\x1f\x8b" ) { return 'application/x-gzip-compressed'; } // Skip redundant check for ZIP if ( $chunk5 == "MThd\000" ) { return 'audio/mid'; } if ( $chunk4 == '%PDF' ) { return 'application/pdf'; } return false; } /** * Do heuristic checks on the bulk of the data sample. * Search for HTML tags. * @param $version * @param $chunk * @return array */ protected function sampleData( $version, $chunk ) { $found = []; $counters = [ 'ctrl' => 0, 'high' => 0, 'low' => 0, 'lf' => 0, 'cr' => 0, 'ff' => 0 ]; $htmlTags = [ 'html', 'head', 'title', 'body', 'script', 'a href', 'pre', 'img', 'plaintext', 'table' ]; $rdfUrl = 'http://www.w3.org/1999/02/22-rdf-syntax-ns#'; $rdfPurl = 'http://purl.org/rss/1.0/'; $xbmMagic1 = '#define'; $xbmMagic2 = '_width'; $xbmMagic3 = '_bits'; $binhexMagic = 'converted with BinHex'; $chunkLength = strlen( $chunk ); for ( $offset = 0; $offset < $chunkLength; $offset++ ) { $curChar = $chunk[$offset]; if ( $curChar == "\x0a" ) { $counters['lf']++; continue; } elseif ( $curChar == "\x0d" ) { $counters['cr']++; continue; } elseif ( $curChar == "\x0c" ) { $counters['ff']++; continue; } elseif ( $curChar == "\t" ) { $counters['low']++; continue; } elseif ( ord( $curChar ) < 32 ) { $counters['ctrl']++; continue; } elseif ( ord( $curChar ) >= 128 ) { $counters['high']++; continue; } $counters['low']++; if ( $curChar == '<' ) { // XML $remainder = substr( $chunk, $offset + 1 ); if ( !strncasecmp( $remainder, '?XML', 4 ) ) { $nextChar = substr( $chunk, $offset + 5, 1 ); if ( $nextChar == ':' || $nextChar == ' ' || $nextChar == "\t" ) { $found['xml'] = true; } } // Scriptlet (JSP) if ( !strncasecmp( $remainder, 'SCRIPTLET', 9 ) ) { $found['scriptlet'] = true; break; } // HTML foreach ( $htmlTags as $tag ) { if ( !strncasecmp( $remainder, $tag, strlen( $tag ) ) ) { $found['html'] = true; } } // Skip broken check for additional tags (HR etc.) // CHANNEL replaced by RSS, RDF and FEED in IE 7 if ( $version < 'ie07' ) { if ( !strncasecmp( $remainder, 'CHANNEL', 7 ) ) { $found['cdf'] = true; } } else { // RSS if ( !strncasecmp( $remainder, 'RSS', 3 ) ) { $found['rss'] = true; break; // return from SampleData } if ( !strncasecmp( $remainder, 'rdf:RDF', 7 ) ) { $found['rdf-tag'] = true; // no break } if ( !strncasecmp( $remainder, 'FEED', 4 ) ) { $found['atom'] = true; break; } } continue; } // Skip broken check for --> // RSS URL checks // For some reason both URLs must appear before it is recognised $remainder = substr( $chunk, $offset ); if ( !strncasecmp( $remainder, $rdfUrl, strlen( $rdfUrl ) ) ) { $found['rdf-url'] = true; if ( isset( $found['rdf-tag'] ) && isset( $found['rdf-purl'] ) ) // [sic] { break; } continue; } if ( !strncasecmp( $remainder, $rdfPurl, strlen( $rdfPurl ) ) ) { if ( isset( $found['rdf-tag'] ) && isset( $found['rdf-url'] ) ) // [sic] { break; } continue; } // XBM checks if ( !strncasecmp( $remainder, $xbmMagic1, strlen( $xbmMagic1 ) ) ) { $found['xbm1'] = true; continue; } if ( $curChar == '_' ) { if ( isset( $found['xbm2'] ) ) { if ( !strncasecmp( $remainder, $xbmMagic3, strlen( $xbmMagic3 ) ) ) { $found['xbm'] = true; break; } } elseif ( isset( $found['xbm1'] ) ) { if ( !strncasecmp( $remainder, $xbmMagic2, strlen( $xbmMagic2 ) ) ) { $found['xbm2'] = true; } } } // BinHex if ( !strncmp( $remainder, $binhexMagic, strlen( $binhexMagic ) ) ) { $found['binhex'] = true; } } return [ 'found' => $found, 'counters' => $counters ]; } /** * @param $version * @param $type * @return int|string */ protected function getDataFormat( $version, $type ) { $types = $this->typeTable[$version]; if ( $type == '(null)' || strval( $type ) === '' ) { return 'ambiguous'; } foreach ( $types as $format => $list ) { if ( in_array( $type, $list ) ) { return $format; } } return 'unknown'; } }