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Public Member Functions
getid3_zip Class Reference

getID3() by James Heinrich info@.nosp@m.geti.nosp@m.d3.or.nosp@m.g // More...

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Public Member Functions

 getid3_zip (&$fd, &$ThisFileInfo)
 getZIPHeaderFilepointerTopDown (&$fd, &$ThisFileInfo)
 getZIPentriesFilepointer (&$fd, &$ThisFileInfo)
 ZIPparseLocalFileHeader (&$fd)
 ZIPparseCentralDirectory (&$fd)
 ZIPparseEndOfCentralDirectory (&$fd)
 ZIPparseGeneralPurposeFlags ($flagbytes, $compressionmethod)
 ZIPversionOSLookup ($index)
 ZIPcompressionMethodLookup ($index)
 DOStime2UNIXtime ($DOSdate, $DOStime)

Detailed Description

getID3() by James Heinrich info@.nosp@m.geti.nosp@m.d3.or.nosp@m.g //

Definition at line 17 of file module.archive.zip.php.

Member Function Documentation

getid3_zip::DOStime2UNIXtime (   $DOSdate,
  $DOStime 
)

Definition at line 386 of file module.archive.zip.php.

Referenced by ZIPparseCentralDirectory(), and ZIPparseLocalFileHeader().

{
// 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);
}

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getid3_zip::getid3_zip ( &  $fd,
&  $ThisFileInfo 
)

Definition at line 20 of file module.archive.zip.php.

References getid3_lib\array_merge_clobber(), getid3_lib\CreateDeepArray(), getZIPentriesFilepointer(), ZIPparseCentralDirectory(), and ZIPparseEndOfCentralDirectory().

{
$ThisFileInfo['fileformat'] = 'zip';
$ThisFileInfo['zip']['encoding'] = 'ISO-8859-1';
$ThisFileInfo['zip']['files'] = array();
$ThisFileInfo['zip']['compressed_size'] = 0;
$ThisFileInfo['zip']['uncompressed_size'] = 0;
$ThisFileInfo['zip']['entries_count'] = 0;
$EOCDsearchData = '';
$EOCDsearchCounter = 0;
while ($EOCDsearchCounter++ < 512) {
fseek($fd, -128 * $EOCDsearchCounter, SEEK_END);
$EOCDsearchData = fread($fd, 128).$EOCDsearchData;
if (strstr($EOCDsearchData, 'PK'."\x05\x06")) {
$EOCDposition = strpos($EOCDsearchData, 'PK'."\x05\x06");
fseek($fd, (-128 * $EOCDsearchCounter) + $EOCDposition, SEEK_END);
$ThisFileInfo['zip']['end_central_directory'] = $this->ZIPparseEndOfCentralDirectory($fd);
fseek($fd, $ThisFileInfo['zip']['end_central_directory']['directory_offset'], SEEK_SET);
$ThisFileInfo['zip']['entries_count'] = 0;
while ($centraldirectoryentry = $this->ZIPparseCentralDirectory($fd)) {
$ThisFileInfo['zip']['central_directory'][] = $centraldirectoryentry;
$ThisFileInfo['zip']['entries_count']++;
$ThisFileInfo['zip']['compressed_size'] += $centraldirectoryentry['compressed_size'];
$ThisFileInfo['zip']['uncompressed_size'] += $centraldirectoryentry['uncompressed_size'];
if ($centraldirectoryentry['uncompressed_size'] > 0) {
$ThisFileInfo['zip']['files'] = getid3_lib::array_merge_clobber($ThisFileInfo['zip']['files'], getid3_lib::CreateDeepArray($centraldirectoryentry['filename'], '/', $centraldirectoryentry['uncompressed_size']));
}
}
if ($ThisFileInfo['zip']['entries_count'] == 0) {
$ThisFileInfo['error'][] = 'No Central Directory entries found (truncated file?)';
return false;
}
if (!empty($ThisFileInfo['zip']['end_central_directory']['comment'])) {
$ThisFileInfo['zip']['comments']['comment'][] = $ThisFileInfo['zip']['end_central_directory']['comment'];
}
if (isset($ThisFileInfo['zip']['central_directory'][0]['compression_method'])) {
$ThisFileInfo['zip']['compression_method'] = $ThisFileInfo['zip']['central_directory'][0]['compression_method'];
}
if (isset($ThisFileInfo['zip']['central_directory'][0]['flags']['compression_speed'])) {
$ThisFileInfo['zip']['compression_speed'] = $ThisFileInfo['zip']['central_directory'][0]['flags']['compression_speed'];
}
if (isset($ThisFileInfo['zip']['compression_method']) && ($ThisFileInfo['zip']['compression_method'] == 'store') && !isset($ThisFileInfo['zip']['compression_speed'])) {
$ThisFileInfo['zip']['compression_speed'] = 'store';
}
return true;
}
}
if ($this->getZIPentriesFilepointer($fd, $ThisFileInfo)) {
// central directory couldn't be found and/or parsed
// scan through actual file data entries, recover as much as possible from probable trucated file
if ($ThisFileInfo['zip']['compressed_size'] > ($ThisFileInfo['filesize'] - 46 - 22)) {
$ThisFileInfo['error'][] = 'Warning: Truncated file! - Total compressed file sizes ('.$ThisFileInfo['zip']['compressed_size'].' bytes) is greater than filesize minus Central Directory and End Of Central Directory structures ('.($ThisFileInfo['filesize'] - 46 - 22).' bytes)';
}
$ThisFileInfo['error'][] = 'Cannot find End Of Central Directory - returned list of files in [zip][entries] array may not be complete';
foreach ($ThisFileInfo['zip']['entries'] as $key => $valuearray) {
$ThisFileInfo['zip']['files'][$valuearray['filename']] = $valuearray['uncompressed_size'];
}
return true;
} else {
unset($ThisFileInfo['zip']);
$ThisFileInfo['fileformat'] = '';
$ThisFileInfo['error'][] = 'Cannot find End Of Central Directory (truncated file?)';
return false;
}
}

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getid3_zip::getZIPentriesFilepointer ( &  $fd,
&  $ThisFileInfo 
)

Definition at line 149 of file module.archive.zip.php.

References ZIPparseLocalFileHeader().

Referenced by getid3_zip().

{
$ThisFileInfo['zip']['compressed_size'] = 0;
$ThisFileInfo['zip']['uncompressed_size'] = 0;
$ThisFileInfo['zip']['entries_count'] = 0;
rewind($fd);
while ($fileentry = $this->ZIPparseLocalFileHeader($fd)) {
$ThisFileInfo['zip']['entries'][] = $fileentry;
$ThisFileInfo['zip']['entries_count']++;
$ThisFileInfo['zip']['compressed_size'] += $fileentry['compressed_size'];
$ThisFileInfo['zip']['uncompressed_size'] += $fileentry['uncompressed_size'];
}
if ($ThisFileInfo['zip']['entries_count'] == 0) {
$ThisFileInfo['error'][] = 'No Local File Header entries found';
return false;
}
return true;
}

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getid3_zip::getZIPHeaderFilepointerTopDown ( &  $fd,
&  $ThisFileInfo 
)

Definition at line 105 of file module.archive.zip.php.

References ZIPparseCentralDirectory(), ZIPparseEndOfCentralDirectory(), and ZIPparseLocalFileHeader().

{
$ThisFileInfo['fileformat'] = 'zip';
$ThisFileInfo['zip']['compressed_size'] = 0;
$ThisFileInfo['zip']['uncompressed_size'] = 0;
$ThisFileInfo['zip']['entries_count'] = 0;
rewind($fd);
while ($fileentry = $this->ZIPparseLocalFileHeader($fd)) {
$ThisFileInfo['zip']['entries'][] = $fileentry;
$ThisFileInfo['zip']['entries_count']++;
}
if ($ThisFileInfo['zip']['entries_count'] == 0) {
$ThisFileInfo['error'][] = 'No Local File Header entries found';
return false;
}
$ThisFileInfo['zip']['entries_count'] = 0;
while ($centraldirectoryentry = $this->ZIPparseCentralDirectory($fd)) {
$ThisFileInfo['zip']['central_directory'][] = $centraldirectoryentry;
$ThisFileInfo['zip']['entries_count']++;
$ThisFileInfo['zip']['compressed_size'] += $centraldirectoryentry['compressed_size'];
$ThisFileInfo['zip']['uncompressed_size'] += $centraldirectoryentry['uncompressed_size'];
}
if ($ThisFileInfo['zip']['entries_count'] == 0) {
$ThisFileInfo['error'][] = 'No Central Directory entries found (truncated file?)';
return false;
}
if ($EOCD = $this->ZIPparseEndOfCentralDirectory($fd)) {
$ThisFileInfo['zip']['end_central_directory'] = $EOCD;
} else {
$ThisFileInfo['error'][] = 'No End Of Central Directory entry found (truncated file?)';
return false;
}
if (!empty($ThisFileInfo['zip']['end_central_directory']['comment'])) {
$ThisFileInfo['zip']['comments']['comment'][] = $ThisFileInfo['zip']['end_central_directory']['comment'];
}
return true;
}

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getid3_zip::ZIPcompressionMethodLookup (   $index)

Definition at line 368 of file module.archive.zip.php.

Referenced by ZIPparseCentralDirectory(), and ZIPparseLocalFileHeader().

{
static $ZIPcompressionMethodLookup = array(
0 => 'store',
1 => 'shrink',
2 => 'reduce-1',
3 => 'reduce-2',
4 => 'reduce-3',
5 => 'reduce-4',
6 => 'implode',
7 => 'tokenize',
8 => 'deflate',
9 => 'deflate64',
10 => 'PKWARE Date Compression Library Imploding'
);
return (isset($ZIPcompressionMethodLookup[$index]) ? $ZIPcompressionMethodLookup[$index] : '[unknown]');
}

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getid3_zip::ZIPparseCentralDirectory ( &  $fd)

Definition at line 227 of file module.archive.zip.php.

References DOStime2UNIXtime(), getid3_lib\LittleEndian2Int(), ZIPcompressionMethodLookup(), ZIPparseGeneralPurposeFlags(), and ZIPversionOSLookup().

Referenced by getid3_zip(), and getZIPHeaderFilepointerTopDown().

{
$CentralDirectory['offset'] = ftell($fd);
$ZIPcentralDirectory = fread($fd, 46);
$CentralDirectory['raw']['signature'] = getid3_lib::LittleEndian2Int(substr($ZIPcentralDirectory, 0, 4));
if ($CentralDirectory['raw']['signature'] != 0x02014B50) {
// invalid Central Directory Signature
fseek($fd, $CentralDirectory['offset'], SEEK_SET); // 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) {
$FilenameExtrafieldComment = fread($fd, $FilenameExtrafieldCommentLength);
if ($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;
}

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getid3_zip::ZIPparseEndOfCentralDirectory ( &  $fd)

Definition at line 283 of file module.archive.zip.php.

References getid3_lib\LittleEndian2Int().

Referenced by getid3_zip(), and getZIPHeaderFilepointerTopDown().

{
$EndOfCentralDirectory['offset'] = ftell($fd);
$ZIPendOfCentralDirectory = fread($fd, 22);
$EndOfCentralDirectory['signature'] = getid3_lib::LittleEndian2Int(substr($ZIPendOfCentralDirectory, 0, 4));
if ($EndOfCentralDirectory['signature'] != 0x06054B50) {
// invalid End Of Central Directory Signature
fseek($fd, $EndOfCentralDirectory['offset'], SEEK_SET); // 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) {
$EndOfCentralDirectory['comment'] = fread($fd, $EndOfCentralDirectory['comment_length']);
}
return $EndOfCentralDirectory;
}

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getid3_zip::ZIPparseGeneralPurposeFlags (   $flagbytes,
  $compressionmethod 
)

Definition at line 310 of file module.archive.zip.php.

Referenced by ZIPparseCentralDirectory(), and ZIPparseLocalFileHeader().

{
$ParsedFlags['encrypted'] = (bool) ($flagbytes & 0x0001);
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;
}
$ParsedFlags['data_descriptor_used'] = (bool) ($flagbytes & 0x0008);
return $ParsedFlags;
}

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getid3_zip::ZIPparseLocalFileHeader ( &  $fd)

Definition at line 170 of file module.archive.zip.php.

References DOStime2UNIXtime(), getid3_lib\LittleEndian2Int(), ZIPcompressionMethodLookup(), ZIPparseGeneralPurposeFlags(), and ZIPversionOSLookup().

Referenced by getZIPentriesFilepointer(), and getZIPHeaderFilepointerTopDown().

{
$LocalFileHeader['offset'] = ftell($fd);
$ZIPlocalFileHeader = fread($fd, 30);
$LocalFileHeader['raw']['signature'] = getid3_lib::LittleEndian2Int(substr($ZIPlocalFileHeader, 0, 4));
if ($LocalFileHeader['raw']['signature'] != 0x04034B50) {
// invalid Local File Header Signature
fseek($fd, $LocalFileHeader['offset'], SEEK_SET); // 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) {
$ZIPlocalFileHeader .= fread($fd, $FilenameExtrafieldLength);
if ($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']);
}
}
$LocalFileHeader['data_offset'] = ftell($fd);
//$LocalFileHeader['compressed_data'] = fread($fd, $LocalFileHeader['raw']['compressed_size']);
fseek($fd, $LocalFileHeader['raw']['compressed_size'], SEEK_CUR);
if ($LocalFileHeader['flags']['data_descriptor_used']) {
$DataDescriptor = fread($fd, 12);
$LocalFileHeader['data_descriptor']['crc_32'] = getid3_lib::LittleEndian2Int(substr($DataDescriptor, 0, 4));
$LocalFileHeader['data_descriptor']['compressed_size'] = getid3_lib::LittleEndian2Int(substr($DataDescriptor, 4, 4));
$LocalFileHeader['data_descriptor']['uncompressed_size'] = getid3_lib::LittleEndian2Int(substr($DataDescriptor, 8, 4));
}
return $LocalFileHeader;
}

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getid3_zip::ZIPversionOSLookup (   $index)

Definition at line 343 of file module.archive.zip.php.

Referenced by ZIPparseCentralDirectory(), and ZIPparseLocalFileHeader().

{
static $ZIPversionOSLookup = array(
0 => 'MS-DOS and OS/2 (FAT / VFAT / FAT32 file systems)',
1 => 'Amiga',
2 => 'OpenVMS',
3 => 'Unix',
4 => 'VM/CMS',
5 => 'Atari ST',
6 => 'OS/2 H.P.F.S.',
7 => 'Macintosh',
8 => 'Z-System',
9 => 'CP/M',
10 => 'Windows NTFS',
11 => 'MVS',
12 => 'VSE',
13 => 'Acorn Risc',
14 => 'VFAT',
15 => 'Alternate MVS',
16 => 'BeOS',
17 => 'Tandem'
);
return (isset($ZIPversionOSLookup[$index]) ? $ZIPversionOSLookup[$index] : '[unknown]');
}

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The documentation for this class was generated from the following file: