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Diffstat (limited to 'includes/getid3/module.archive.zip.php')
| -rw-r--r-- | includes/getid3/module.archive.zip.php | 570 |
1 files changed, 570 insertions, 0 deletions
diff --git a/includes/getid3/module.archive.zip.php b/includes/getid3/module.archive.zip.php new file mode 100644 index 0000000..1ce3fb7 --- /dev/null +++ b/includes/getid3/module.archive.zip.php @@ -0,0 +1,570 @@ +<?php + +///////////////////////////////////////////////////////////////// +/// getID3() by James Heinrich <info@getid3.org> // +// available at https://github.com/JamesHeinrich/getID3 // +// or https://www.getid3.org // +// or http://getid3.sourceforge.net // +// see readme.txt for more details // +///////////////////////////////////////////////////////////////// +// // +// module.archive.zip.php // +// module for analyzing pkZip files // +// dependencies: NONE // +// /// +///////////////////////////////////////////////////////////////// + +if (!defined('GETID3_INCLUDEPATH')) { // prevent path-exposing attacks that access modules directly on public webservers + exit; +} + +class getid3_zip extends getid3_handler +{ + /** + * @return bool + */ + public function Analyze() { + $info = &$this->getid3->info; + + $info['fileformat'] = 'zip'; + $info['zip']['encoding'] = 'ISO-8859-1'; + $info['zip']['files'] = array(); + + $info['zip']['compressed_size'] = 0; + $info['zip']['uncompressed_size'] = 0; + $info['zip']['entries_count'] = 0; + + if (!getid3_lib::intValueSupported($info['filesize'])) { + $this->error('File is larger than '.round(PHP_INT_MAX / 1073741824).'GB, not supported by PHP'); + return false; + } else { + $EOCDsearchData = ''; + $EOCDsearchCounter = 0; + while ($EOCDsearchCounter++ < 512) { + + $this->fseek(-128 * $EOCDsearchCounter, SEEK_END); + $EOCDsearchData = $this->fread(128).$EOCDsearchData; + + if (strstr($EOCDsearchData, 'PK'."\x05\x06")) { + + $EOCDposition = strpos($EOCDsearchData, 'PK'."\x05\x06"); + $this->fseek((-128 * $EOCDsearchCounter) + $EOCDposition, SEEK_END); + $info['zip']['end_central_directory'] = $this->ZIPparseEndOfCentralDirectory(); + + $this->fseek($info['zip']['end_central_directory']['directory_offset']); + $info['zip']['entries_count'] = 0; + while ($centraldirectoryentry = $this->ZIPparseCentralDirectory()) { + $info['zip']['central_directory'][] = $centraldirectoryentry; + $info['zip']['entries_count']++; + $info['zip']['compressed_size'] += $centraldirectoryentry['compressed_size']; + $info['zip']['uncompressed_size'] += $centraldirectoryentry['uncompressed_size']; + + //if ($centraldirectoryentry['uncompressed_size'] > 0) { zero-byte files are valid + if (!empty($centraldirectoryentry['filename'])) { + $info['zip']['files'] = getid3_lib::array_merge_clobber($info['zip']['files'], getid3_lib::CreateDeepArray($centraldirectoryentry['filename'], '/', $centraldirectoryentry['uncompressed_size'])); + } + } + + if ($info['zip']['entries_count'] == 0) { + $this->error('No Central Directory entries found (truncated file?)'); + return false; + } + + if (!empty($info['zip']['end_central_directory']['comment'])) { + $info['zip']['comments']['comment'][] = $info['zip']['end_central_directory']['comment']; + } + + if (isset($info['zip']['central_directory'][0]['compression_method'])) { + $info['zip']['compression_method'] = $info['zip']['central_directory'][0]['compression_method']; + } + if (isset($info['zip']['central_directory'][0]['flags']['compression_speed'])) { + $info['zip']['compression_speed'] = $info['zip']['central_directory'][0]['flags']['compression_speed']; + } + if (isset($info['zip']['compression_method']) && ($info['zip']['compression_method'] == 'store') && !isset($info['zip']['compression_speed'])) { + $info['zip']['compression_speed'] = 'store'; + } + + // secondary check - we (should) already have all the info we NEED from the Central Directory above, but scanning each + // Local File Header entry will + foreach ($info['zip']['central_directory'] as $central_directory_entry) { + $this->fseek($central_directory_entry['entry_offset']); + if ($fileentry = $this->ZIPparseLocalFileHeader()) { + $info['zip']['entries'][] = $fileentry; + } else { + $this->warning('Error parsing Local File Header at offset '.$central_directory_entry['entry_offset']); + } + } + + // check for EPUB files + if (!empty($info['zip']['entries'][0]['filename']) && + ($info['zip']['entries'][0]['filename'] == 'mimetype') && + ($info['zip']['entries'][0]['compression_method'] == 'store') && + ($info['zip']['entries'][0]['uncompressed_size'] == 20) && + isset($info['zip']['entries'][0]['data_offset'])) { + // http://idpf.org/epub/30/spec/epub30-ocf.html + // "3.3 OCF ZIP Container Media Type Identification + // OCF ZIP Containers must include a mimetype file as the first file in the Container, and the contents of this file must be the MIME type string application/epub+zip. + // The contents of the mimetype file must not contain any leading padding or whitespace, must not begin with the Unicode signature (or Byte Order Mark), + // and the case of the MIME type string must be exactly as presented above. The mimetype file additionally must be neither compressed nor encrypted, + // and there must not be an extra field in its ZIP header." + $this->fseek($info['zip']['entries'][0]['data_offset']); + if ($this->fread(20) == 'application/epub+zip') { + $info['fileformat'] = 'zip.epub'; + $info['mime_type'] = 'application/epub+zip'; + } + } + + // check for Office Open XML files (e.g. .docx, .xlsx) + if (!empty($info['zip']['files']['[Content_Types].xml']) && + !empty($info['zip']['files']['_rels']['.rels']) && + !empty($info['zip']['files']['docProps']['app.xml']) && + !empty($info['zip']['files']['docProps']['core.xml'])) { + // http://technet.microsoft.com/en-us/library/cc179224.aspx + $info['fileformat'] = 'zip.msoffice'; + if (!empty($ThisFileInfo['zip']['files']['ppt'])) { + $info['mime_type'] = 'application/vnd.openxmlformats-officedocument.presentationml.presentation'; + } elseif (!empty($ThisFileInfo['zip']['files']['xl'])) { + $info['mime_type'] = 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet'; + } elseif (!empty($ThisFileInfo['zip']['files']['word'])) { + $info['mime_type'] = 'application/vnd.openxmlformats-officedocument.wordprocessingml.document'; + } + } + + return true; + } + } + } + + if (!$this->getZIPentriesFilepointer()) { + unset($info['zip']); + $info['fileformat'] = ''; + $this->error('Cannot find End Of Central Directory (truncated file?)'); + return false; + } + + // central directory couldn't be found and/or parsed + // scan through actual file data entries, recover as much as possible from probable trucated file + if ($info['zip']['compressed_size'] > ($info['filesize'] - 46 - 22)) { + $this->error('Warning: Truncated file! - Total compressed file sizes ('.$info['zip']['compressed_size'].' bytes) is greater than filesize minus Central Directory and End Of Central Directory structures ('.($info['filesize'] - 46 - 22).' bytes)'); + } + $this->error('Cannot find End Of Central Directory - returned list of files in [zip][entries] array may not be complete'); + foreach ($info['zip']['entries'] as $key => $valuearray) { + $info['zip']['files'][$valuearray['filename']] = $valuearray['uncompressed_size']; + } + return true; + } + + /** + * @return bool + */ + public function getZIPHeaderFilepointerTopDown() { + $info = &$this->getid3->info; + + $info['fileformat'] = 'zip'; + + $info['zip']['compressed_size'] = 0; + $info['zip']['uncompressed_size'] = 0; + $info['zip']['entries_count'] = 0; + + rewind($this->getid3->fp); + while ($fileentry = $this->ZIPparseLocalFileHeader()) { + $info['zip']['entries'][] = $fileentry; + $info['zip']['entries_count']++; + } + if ($info['zip']['entries_count'] == 0) { + $this->error('No Local File Header entries found'); + return false; + } + + $info['zip']['entries_count'] = 0; + while ($centraldirectoryentry = $this->ZIPparseCentralDirectory()) { + $info['zip']['central_directory'][] = $centraldirectoryentry; + $info['zip']['entries_count']++; + $info['zip']['compressed_size'] += $centraldirectoryentry['compressed_size']; + $info['zip']['uncompressed_size'] += $centraldirectoryentry['uncompressed_size']; + } + if ($info['zip']['entries_count'] == 0) { + $this->error('No Central Directory entries found (truncated file?)'); + return false; + } + + if ($EOCD = $this->ZIPparseEndOfCentralDirectory()) { + $info['zip']['end_central_directory'] = $EOCD; + } else { + $this->error('No End Of Central Directory entry found (truncated file?)'); + return false; + } + + if (!empty($info['zip']['end_central_directory']['comment'])) { + $info['zip']['comments']['comment'][] = $info['zip']['end_central_directory']['comment']; + } + + return true; + } + + /** + * @return bool + */ + public function getZIPentriesFilepointer() { + $info = &$this->getid3->info; + + $info['zip']['compressed_size'] = 0; + $info['zip']['uncompressed_size'] = 0; + $info['zip']['entries_count'] = 0; + + rewind($this->getid3->fp); + while ($fileentry = $this->ZIPparseLocalFileHeader()) { + $info['zip']['entries'][] = $fileentry; + $info['zip']['entries_count']++; + $info['zip']['compressed_size'] += $fileentry['compressed_size']; + $info['zip']['uncompressed_size'] += $fileentry['uncompressed_size']; + } + if ($info['zip']['entries_count'] == 0) { + $this->error('No Local File Header entries found'); + return false; + } + + return true; + } + + /** + * @return array|false + */ + public function ZIPparseLocalFileHeader() { + $LocalFileHeader['offset'] = $this->ftell(); + + $ZIPlocalFileHeader = $this->fread(30); + + $LocalFileHeader['raw']['signature'] = getid3_lib::LittleEndian2Int(substr($ZIPlocalFileHeader, 0, 4)); + if ($LocalFileHeader['raw']['signature'] != 0x04034B50) { // "PK\x03\x04" + // invalid Local File Header Signature + $this->fseek($LocalFileHeader['offset']); // seek back to where filepointer originally was so it can be handled properly + return false; + } + $LocalFileHeader['raw']['extract_version'] = getid3_lib::LittleEndian2Int(substr($ZIPlocalFileHeader, 4, 2)); + $LocalFileHeader['raw']['general_flags'] = getid3_lib::LittleEndian2Int(substr($ZIPlocalFileHeader, 6, 2)); + $LocalFileHeader['raw']['compression_method'] = getid3_lib::LittleEndian2Int(substr($ZIPlocalFileHeader, 8, 2)); + $LocalFileHeader['raw']['last_mod_file_time'] = getid3_lib::LittleEndian2Int(substr($ZIPlocalFileHeader, 10, 2)); + $LocalFileHeader['raw']['last_mod_file_date'] = getid3_lib::LittleEndian2Int(substr($ZIPlocalFileHeader, 12, 2)); + $LocalFileHeader['raw']['crc_32'] = getid3_lib::LittleEndian2Int(substr($ZIPlocalFileHeader, 14, 4)); + $LocalFileHeader['raw']['compressed_size'] = getid3_lib::LittleEndian2Int(substr($ZIPlocalFileHeader, 18, 4)); + $LocalFileHeader['raw']['uncompressed_size'] = getid3_lib::LittleEndian2Int(substr($ZIPlocalFileHeader, 22, 4)); + $LocalFileHeader['raw']['filename_length'] = getid3_lib::LittleEndian2Int(substr($ZIPlocalFileHeader, 26, 2)); + $LocalFileHeader['raw']['extra_field_length'] = getid3_lib::LittleEndian2Int(substr($ZIPlocalFileHeader, 28, 2)); + + $LocalFileHeader['extract_version'] = sprintf('%1.1f', $LocalFileHeader['raw']['extract_version'] / 10); + $LocalFileHeader['host_os'] = $this->ZIPversionOSLookup(($LocalFileHeader['raw']['extract_version'] & 0xFF00) >> 8); + $LocalFileHeader['compression_method'] = $this->ZIPcompressionMethodLookup($LocalFileHeader['raw']['compression_method']); + $LocalFileHeader['compressed_size'] = $LocalFileHeader['raw']['compressed_size']; + $LocalFileHeader['uncompressed_size'] = $LocalFileHeader['raw']['uncompressed_size']; + $LocalFileHeader['flags'] = $this->ZIPparseGeneralPurposeFlags($LocalFileHeader['raw']['general_flags'], $LocalFileHeader['raw']['compression_method']); + $LocalFileHeader['last_modified_timestamp'] = $this->DOStime2UNIXtime($LocalFileHeader['raw']['last_mod_file_date'], $LocalFileHeader['raw']['last_mod_file_time']); + + $FilenameExtrafieldLength = $LocalFileHeader['raw']['filename_length'] + $LocalFileHeader['raw']['extra_field_length']; + if ($FilenameExtrafieldLength > 0) { + $ZIPlocalFileHeader .= $this->fread($FilenameExtrafieldLength); + + if ($LocalFileHeader['raw']['filename_length'] > 0) { + $LocalFileHeader['filename'] = substr($ZIPlocalFileHeader, 30, $LocalFileHeader['raw']['filename_length']); + } + if ($LocalFileHeader['raw']['extra_field_length'] > 0) { + $LocalFileHeader['raw']['extra_field_data'] = substr($ZIPlocalFileHeader, 30 + $LocalFileHeader['raw']['filename_length'], $LocalFileHeader['raw']['extra_field_length']); + } + } + + if ($LocalFileHeader['compressed_size'] == 0) { + // *Could* be a zero-byte file + // But could also be a file written on the fly that didn't know compressed filesize beforehand. + // Correct compressed filesize should be in the data_descriptor located after this file data, and also in Central Directory (at end of zip file) + if (!empty($this->getid3->info['zip']['central_directory'])) { + foreach ($this->getid3->info['zip']['central_directory'] as $central_directory_entry) { + if ($central_directory_entry['entry_offset'] == $LocalFileHeader['offset']) { + if ($central_directory_entry['compressed_size'] > 0) { + // overwrite local zero value (but not ['raw']'compressed_size']) so that seeking for data_descriptor (and next file entry) works correctly + $LocalFileHeader['compressed_size'] = $central_directory_entry['compressed_size']; + } + break; + } + } + } + + } + $LocalFileHeader['data_offset'] = $this->ftell(); + $this->fseek($LocalFileHeader['compressed_size'], SEEK_CUR); // this should (but may not) match value in $LocalFileHeader['raw']['compressed_size'] -- $LocalFileHeader['compressed_size'] could have been overwritten above with value from Central Directory + + if ($LocalFileHeader['flags']['data_descriptor_used']) { + $DataDescriptor = $this->fread(16); + $LocalFileHeader['data_descriptor']['signature'] = getid3_lib::LittleEndian2Int(substr($DataDescriptor, 0, 4)); + if ($LocalFileHeader['data_descriptor']['signature'] != 0x08074B50) { // "PK\x07\x08" + $this->getid3->warning('invalid Local File Header Data Descriptor Signature at offset '.($this->ftell() - 16).' - expecting 08 07 4B 50, found '.getid3_lib::PrintHexBytes($LocalFileHeader['data_descriptor']['signature'])); + $this->fseek($LocalFileHeader['offset']); // seek back to where filepointer originally was so it can be handled properly + return false; + } + $LocalFileHeader['data_descriptor']['crc_32'] = getid3_lib::LittleEndian2Int(substr($DataDescriptor, 4, 4)); + $LocalFileHeader['data_descriptor']['compressed_size'] = getid3_lib::LittleEndian2Int(substr($DataDescriptor, 8, 4)); + $LocalFileHeader['data_descriptor']['uncompressed_size'] = getid3_lib::LittleEndian2Int(substr($DataDescriptor, 12, 4)); + if (!$LocalFileHeader['raw']['compressed_size'] && $LocalFileHeader['data_descriptor']['compressed_size']) { + foreach ($this->getid3->info['zip']['central_directory'] as $central_directory_entry) { + if ($central_directory_entry['entry_offset'] == $LocalFileHeader['offset']) { + if ($LocalFileHeader['data_descriptor']['compressed_size'] == $central_directory_entry['compressed_size']) { + // $LocalFileHeader['compressed_size'] already set from Central Directory + } else { + $this->warning('conflicting compressed_size from data_descriptor ('.$LocalFileHeader['data_descriptor']['compressed_size'].') vs Central Directory ('.$central_directory_entry['compressed_size'].') for file at offset '.$LocalFileHeader['offset']); + } + + if ($LocalFileHeader['data_descriptor']['uncompressed_size'] == $central_directory_entry['uncompressed_size']) { + $LocalFileHeader['uncompressed_size'] = $LocalFileHeader['data_descriptor']['uncompressed_size']; + } else { + $this->warning('conflicting uncompressed_size from data_descriptor ('.$LocalFileHeader['data_descriptor']['uncompressed_size'].') vs Central Directory ('.$central_directory_entry['uncompressed_size'].') for file at offset '.$LocalFileHeader['offset']); + } + break; + } + } + } + } + return $LocalFileHeader; + } + + /** + * @return array|false + */ + public function ZIPparseCentralDirectory() { + $CentralDirectory['offset'] = $this->ftell(); + + $ZIPcentralDirectory = $this->fread(46); + + $CentralDirectory['raw']['signature'] = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory, 0, 4)); + if ($CentralDirectory['raw']['signature'] != 0x02014B50) { + // invalid Central Directory Signature + $this->fseek($CentralDirectory['offset']); // seek back to where filepointer originally was so it can be handled properly + return false; + } + $CentralDirectory['raw']['create_version'] = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory, 4, 2)); + $CentralDirectory['raw']['extract_version'] = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory, 6, 2)); + $CentralDirectory['raw']['general_flags'] = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory, 8, 2)); + $CentralDirectory['raw']['compression_method'] = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory, 10, 2)); + $CentralDirectory['raw']['last_mod_file_time'] = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory, 12, 2)); + $CentralDirectory['raw']['last_mod_file_date'] = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory, 14, 2)); + $CentralDirectory['raw']['crc_32'] = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory, 16, 4)); + $CentralDirectory['raw']['compressed_size'] = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory, 20, 4)); + $CentralDirectory['raw']['uncompressed_size'] = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory, 24, 4)); + $CentralDirectory['raw']['filename_length'] = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory, 28, 2)); + $CentralDirectory['raw']['extra_field_length'] = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory, 30, 2)); + $CentralDirectory['raw']['file_comment_length'] = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory, 32, 2)); + $CentralDirectory['raw']['disk_number_start'] = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory, 34, 2)); + $CentralDirectory['raw']['internal_file_attrib'] = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory, 36, 2)); + $CentralDirectory['raw']['external_file_attrib'] = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory, 38, 4)); + $CentralDirectory['raw']['local_header_offset'] = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory, 42, 4)); + + $CentralDirectory['entry_offset'] = $CentralDirectory['raw']['local_header_offset']; + $CentralDirectory['create_version'] = sprintf('%1.1f', $CentralDirectory['raw']['create_version'] / 10); + $CentralDirectory['extract_version'] = sprintf('%1.1f', $CentralDirectory['raw']['extract_version'] / 10); + $CentralDirectory['host_os'] = $this->ZIPversionOSLookup(($CentralDirectory['raw']['extract_version'] & 0xFF00) >> 8); + $CentralDirectory['compression_method'] = $this->ZIPcompressionMethodLookup($CentralDirectory['raw']['compression_method']); + $CentralDirectory['compressed_size'] = $CentralDirectory['raw']['compressed_size']; + $CentralDirectory['uncompressed_size'] = $CentralDirectory['raw']['uncompressed_size']; + $CentralDirectory['flags'] = $this->ZIPparseGeneralPurposeFlags($CentralDirectory['raw']['general_flags'], $CentralDirectory['raw']['compression_method']); + $CentralDirectory['last_modified_timestamp'] = $this->DOStime2UNIXtime($CentralDirectory['raw']['last_mod_file_date'], $CentralDirectory['raw']['last_mod_file_time']); + + $FilenameExtrafieldCommentLength = $CentralDirectory['raw']['filename_length'] + $CentralDirectory['raw']['extra_field_length'] + $CentralDirectory['raw']['file_comment_length']; + if ($FilenameExtrafieldCommentLength > 0) { + $FilenameExtrafieldComment = $this->fread($FilenameExtrafieldCommentLength); + + if ($CentralDirectory['raw']['filename_length'] > 0) { + $CentralDirectory['filename'] = substr($FilenameExtrafieldComment, 0, $CentralDirectory['raw']['filename_length']); + } + if ($CentralDirectory['raw']['extra_field_length'] > 0) { + $CentralDirectory['raw']['extra_field_data'] = substr($FilenameExtrafieldComment, $CentralDirectory['raw']['filename_length'], $CentralDirectory['raw']['extra_field_length']); + } + if ($CentralDirectory['raw']['file_comment_length'] > 0) { + $CentralDirectory['file_comment'] = substr($FilenameExtrafieldComment, $CentralDirectory['raw']['filename_length'] + $CentralDirectory['raw']['extra_field_length'], $CentralDirectory['raw']['file_comment_length']); + } + } + + return $CentralDirectory; + } + + /** + * @return array|false + */ + public function ZIPparseEndOfCentralDirectory() { + $EndOfCentralDirectory['offset'] = $this->ftell(); + + $ZIPendOfCentralDirectory = $this->fread(22); + + $EndOfCentralDirectory['signature'] = getid3_lib::LittleEndian2Int(substr($ZIPendOfCentralDirectory, 0, 4)); + if ($EndOfCentralDirectory['signature'] != 0x06054B50) { + // invalid End Of Central Directory Signature + $this->fseek($EndOfCentralDirectory['offset']); // seek back to where filepointer originally was so it can be handled properly + return false; + } + $EndOfCentralDirectory['disk_number_current'] = getid3_lib::LittleEndian2Int(substr($ZIPendOfCentralDirectory, 4, 2)); + $EndOfCentralDirectory['disk_number_start_directory'] = getid3_lib::LittleEndian2Int(substr($ZIPendOfCentralDirectory, 6, 2)); + $EndOfCentralDirectory['directory_entries_this_disk'] = getid3_lib::LittleEndian2Int(substr($ZIPendOfCentralDirectory, 8, 2)); + $EndOfCentralDirectory['directory_entries_total'] = getid3_lib::LittleEndian2Int(substr($ZIPendOfCentralDirectory, 10, 2)); + $EndOfCentralDirectory['directory_size'] = getid3_lib::LittleEndian2Int(substr($ZIPendOfCentralDirectory, 12, 4)); + $EndOfCentralDirectory['directory_offset'] = getid3_lib::LittleEndian2Int(substr($ZIPendOfCentralDirectory, 16, 4)); + $EndOfCentralDirectory['comment_length'] = getid3_lib::LittleEndian2Int(substr($ZIPendOfCentralDirectory, 20, 2)); + + if ($EndOfCentralDirectory['comment_length'] > 0) { + $EndOfCentralDirectory['comment'] = $this->fread($EndOfCentralDirectory['comment_length']); + } + + return $EndOfCentralDirectory; + } + + /** + * @param int $flagbytes + * @param int $compressionmethod + * + * @return array + */ + public static function ZIPparseGeneralPurposeFlags($flagbytes, $compressionmethod) { + // https://users.cs.jmu.edu/buchhofp/forensics/formats/pkzip-printable.html + $ParsedFlags = array(); + $ParsedFlags['encrypted'] = (bool) ($flagbytes & 0x0001); + // 0x0002 -- see below + // 0x0004 -- see below + $ParsedFlags['data_descriptor_used'] = (bool) ($flagbytes & 0x0008); + $ParsedFlags['enhanced_deflation'] = (bool) ($flagbytes & 0x0010); + $ParsedFlags['compressed_patched_data'] = (bool) ($flagbytes & 0x0020); + $ParsedFlags['strong_encryption'] = (bool) ($flagbytes & 0x0040); + // 0x0080 - unused + // 0x0100 - unused + // 0x0200 - unused + // 0x0400 - unused + $ParsedFlags['language_encoding'] = (bool) ($flagbytes & 0x0800); + // 0x1000 - reserved + $ParsedFlags['mask_header_values'] = (bool) ($flagbytes & 0x2000); + // 0x4000 - reserved + // 0x8000 - reserved + + switch ($compressionmethod) { + case 6: + $ParsedFlags['dictionary_size'] = (($flagbytes & 0x0002) ? 8192 : 4096); + $ParsedFlags['shannon_fano_trees'] = (($flagbytes & 0x0004) ? 3 : 2); + break; + + case 8: + case 9: + switch (($flagbytes & 0x0006) >> 1) { + case 0: + $ParsedFlags['compression_speed'] = 'normal'; + break; + case 1: + $ParsedFlags['compression_speed'] = 'maximum'; + break; + case 2: + $ParsedFlags['compression_speed'] = 'fast'; + break; + case 3: + $ParsedFlags['compression_speed'] = 'superfast'; + break; + } + break; + } + + return $ParsedFlags; + } + + /** + * @param int $index + * + * @return string + */ + public static function ZIPversionOSLookup($index) { + static $ZIPversionOSLookup = array( + 0 => 'MS-DOS and OS/2 (FAT / VFAT / FAT32 file systems)', + 1 => 'Amiga', + 2 => 'OpenVMS', + 3 => 'Unix', + 4 => 'VM/CMS', + 5 => 'Atari ST', + 6 => 'OS/2 H.P.F.S.', + 7 => 'Macintosh', + 8 => 'Z-System', + 9 => 'CP/M', + 10 => 'Windows NTFS', + 11 => 'MVS', + 12 => 'VSE', + 13 => 'Acorn Risc', + 14 => 'VFAT', + 15 => 'Alternate MVS', + 16 => 'BeOS', + 17 => 'Tandem', + 18 => 'OS/400', + 19 => 'OS/X (Darwin)', + ); + + return (isset($ZIPversionOSLookup[$index]) ? $ZIPversionOSLookup[$index] : '[unknown]'); + } + + /** + * @param int $index + * + * @return string + */ + public static function ZIPcompressionMethodLookup($index) { + // http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/ZIP.html + static $ZIPcompressionMethodLookup = array( + 0 => 'store', + 1 => 'shrink', + 2 => 'reduce-1', + 3 => 'reduce-2', + 4 => 'reduce-3', + 5 => 'reduce-4', + 6 => 'implode', + 7 => 'tokenize', + 8 => 'deflate', + 9 => 'deflate64', + 10 => 'Imploded (old IBM TERSE)', + 11 => 'RESERVED[11]', + 12 => 'BZIP2', + 13 => 'RESERVED[13]', + 14 => 'LZMA (EFS)', + 15 => 'RESERVED[15]', + 16 => 'RESERVED[16]', + 17 => 'RESERVED[17]', + 18 => 'IBM TERSE (new)', + 19 => 'IBM LZ77 z Architecture (PFS)', + 96 => 'JPEG recompressed', + 97 => 'WavPack compressed', + 98 => 'PPMd version I, Rev 1', + ); + + return (isset($ZIPcompressionMethodLookup[$index]) ? $ZIPcompressionMethodLookup[$index] : '[unknown]'); + } + + /** + * @param int $DOSdate + * @param int $DOStime + * + * @return int + */ + public static function DOStime2UNIXtime($DOSdate, $DOStime) { + // wFatDate + // Specifies the MS-DOS date. The date is a packed 16-bit value with the following format: + // Bits Contents + // 0-4 Day of the month (1-31) + // 5-8 Month (1 = January, 2 = February, and so on) + // 9-15 Year offset from 1980 (add 1980 to get actual year) + + $UNIXday = ($DOSdate & 0x001F); + $UNIXmonth = (($DOSdate & 0x01E0) >> 5); + $UNIXyear = (($DOSdate & 0xFE00) >> 9) + 1980; + + // wFatTime + // Specifies the MS-DOS time. The time is a packed 16-bit value with the following format: + // Bits Contents + // 0-4 Second divided by 2 + // 5-10 Minute (0-59) + // 11-15 Hour (0-23 on a 24-hour clock) + + $UNIXsecond = ($DOStime & 0x001F) * 2; + $UNIXminute = (($DOStime & 0x07E0) >> 5); + $UNIXhour = (($DOStime & 0xF800) >> 11); + + return gmmktime($UNIXhour, $UNIXminute, $UNIXsecond, $UNIXmonth, $UNIXday, $UNIXyear); + } + +} |