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<?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
$info['fileformat'] = 'zip.msoffice';
if (!empty($info['zip']['files']['ppt'])) {
$info['mime_type'] = 'application/vnd.openxmlformats-officedocument.presentationml.presentation';
} elseif (!empty($info['zip']['files']['xl'])) {
$info['mime_type'] = 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet';
} elseif (!empty($info['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 = array();
$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(substr($DataDescriptor, 0, 4)));
$this->fseek($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 = array();
$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 = array();
$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);
}
}