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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.misc.iso.php //
// module for analyzing ISO files //
// dependencies: NONE //
// ///
/////////////////////////////////////////////////////////////////
if (!defined('GETID3_INCLUDEPATH')) { // prevent path-exposing attacks that access modules directly on public webservers
exit;
}
class getid3_iso extends getid3_handler
{
/**
* @return bool
*/
public function Analyze() {
$info = &$this->getid3->info;
$info['fileformat'] = 'iso';
for ($i = 16; $i <= 19; $i++) {
$this->fseek(2048 * $i);
$ISOheader = $this->fread(2048);
if (substr($ISOheader, 1, 5) == 'CD001') {
switch (ord($ISOheader[0])) {
case 1:
$info['iso']['primary_volume_descriptor']['offset'] = 2048 * $i;
$this->ParsePrimaryVolumeDescriptor($ISOheader);
break;
case 2:
$info['iso']['supplementary_volume_descriptor']['offset'] = 2048 * $i;
$this->ParseSupplementaryVolumeDescriptor($ISOheader);
break;
default:
// skip
break;
}
}
}
$this->ParsePathTable();
$info['iso']['files'] = array();
if (!empty($info['iso']['path_table']['directories'])) {
foreach ($info['iso']['path_table']['directories'] as $directorynum => $directorydata) {
$info['iso']['directories'][$directorynum] = $this->ParseDirectoryRecord($directorydata);
}
}
return true;
}
/**
* @param string $ISOheader
*
* @return bool
*/
public function ParsePrimaryVolumeDescriptor(&$ISOheader) {
// ISO integer values are stored *BOTH* Little-Endian AND Big-Endian format!!
// ie 12345 == 0x3039 is stored as $39 $30 $30 $39 in a 4-byte field
// shortcuts
$info = &$this->getid3->info;
$info['iso']['primary_volume_descriptor']['raw'] = array();
$thisfile_iso_primaryVD = &$info['iso']['primary_volume_descriptor'];
$thisfile_iso_primaryVD_raw = &$thisfile_iso_primaryVD['raw'];
$thisfile_iso_primaryVD_raw['volume_descriptor_type'] = getid3_lib::LittleEndian2Int(substr($ISOheader, 0, 1));
$thisfile_iso_primaryVD_raw['standard_identifier'] = substr($ISOheader, 1, 5);
if ($thisfile_iso_primaryVD_raw['standard_identifier'] != 'CD001') {
$this->error('Expected "CD001" at offset ('.($thisfile_iso_primaryVD['offset'] + 1).'), found "'.$thisfile_iso_primaryVD_raw['standard_identifier'].'" instead');
unset($info['fileformat']);
unset($info['iso']);
return false;
}
$thisfile_iso_primaryVD_raw['volume_descriptor_version'] = getid3_lib::LittleEndian2Int(substr($ISOheader, 6, 1));
//$thisfile_iso_primaryVD_raw['unused_1'] = substr($ISOheader, 7, 1);
$thisfile_iso_primaryVD_raw['system_identifier'] = substr($ISOheader, 8, 32);
$thisfile_iso_primaryVD_raw['volume_identifier'] = substr($ISOheader, 40, 32);
//$thisfile_iso_primaryVD_raw['unused_2'] = substr($ISOheader, 72, 8);
$thisfile_iso_primaryVD_raw['volume_space_size'] = getid3_lib::LittleEndian2Int(substr($ISOheader, 80, 4));
//$thisfile_iso_primaryVD_raw['unused_3'] = substr($ISOheader, 88, 32);
$thisfile_iso_primaryVD_raw['volume_set_size'] = getid3_lib::LittleEndian2Int(substr($ISOheader, 120, 2));
$thisfile_iso_primaryVD_raw['volume_sequence_number'] = getid3_lib::LittleEndian2Int(substr($ISOheader, 124, 2));
$thisfile_iso_primaryVD_raw['logical_block_size'] = getid3_lib::LittleEndian2Int(substr($ISOheader, 128, 2));
$thisfile_iso_primaryVD_raw['path_table_size'] = getid3_lib::LittleEndian2Int(substr($ISOheader, 132, 4));
$thisfile_iso_primaryVD_raw['path_table_l_location'] = getid3_lib::LittleEndian2Int(substr($ISOheader, 140, 2));
$thisfile_iso_primaryVD_raw['path_table_l_opt_location'] = getid3_lib::LittleEndian2Int(substr($ISOheader, 144, 2));
$thisfile_iso_primaryVD_raw['path_table_m_location'] = getid3_lib::LittleEndian2Int(substr($ISOheader, 148, 2));
$thisfile_iso_primaryVD_raw['path_table_m_opt_location'] = getid3_lib::LittleEndian2Int(substr($ISOheader, 152, 2));
$thisfile_iso_primaryVD_raw['root_directory_record'] = substr($ISOheader, 156, 34);
$thisfile_iso_primaryVD_raw['volume_set_identifier'] = substr($ISOheader, 190, 128);
$thisfile_iso_primaryVD_raw['publisher_identifier'] = substr($ISOheader, 318, 128);
$thisfile_iso_primaryVD_raw['data_preparer_identifier'] = substr($ISOheader, 446, 128);
$thisfile_iso_primaryVD_raw['application_identifier'] = substr($ISOheader, 574, 128);
$thisfile_iso_primaryVD_raw['copyright_file_identifier'] = substr($ISOheader, 702, 37);
$thisfile_iso_primaryVD_raw['abstract_file_identifier'] = substr($ISOheader, 739, 37);
$thisfile_iso_primaryVD_raw['bibliographic_file_identifier'] = substr($ISOheader, 776, 37);
$thisfile_iso_primaryVD_raw['volume_creation_date_time'] = substr($ISOheader, 813, 17);
$thisfile_iso_primaryVD_raw['volume_modification_date_time'] = substr($ISOheader, 830, 17);
$thisfile_iso_primaryVD_raw['volume_expiration_date_time'] = substr($ISOheader, 847, 17);
$thisfile_iso_primaryVD_raw['volume_effective_date_time'] = substr($ISOheader, 864, 17);
$thisfile_iso_primaryVD_raw['file_structure_version'] = getid3_lib::LittleEndian2Int(substr($ISOheader, 881, 1));
//$thisfile_iso_primaryVD_raw['unused_4'] = getid3_lib::LittleEndian2Int(substr($ISOheader, 882, 1));
$thisfile_iso_primaryVD_raw['application_data'] = substr($ISOheader, 883, 512);
//$thisfile_iso_primaryVD_raw['unused_5'] = substr($ISOheader, 1395, 653);
$thisfile_iso_primaryVD['system_identifier'] = trim($thisfile_iso_primaryVD_raw['system_identifier']);
$thisfile_iso_primaryVD['volume_identifier'] = trim($thisfile_iso_primaryVD_raw['volume_identifier']);
$thisfile_iso_primaryVD['volume_set_identifier'] = trim($thisfile_iso_primaryVD_raw['volume_set_identifier']);
$thisfile_iso_primaryVD['publisher_identifier'] = trim($thisfile_iso_primaryVD_raw['publisher_identifier']);
$thisfile_iso_primaryVD['data_preparer_identifier'] = trim($thisfile_iso_primaryVD_raw['data_preparer_identifier']);
$thisfile_iso_primaryVD['application_identifier'] = trim($thisfile_iso_primaryVD_raw['application_identifier']);
$thisfile_iso_primaryVD['copyright_file_identifier'] = trim($thisfile_iso_primaryVD_raw['copyright_file_identifier']);
$thisfile_iso_primaryVD['abstract_file_identifier'] = trim($thisfile_iso_primaryVD_raw['abstract_file_identifier']);
$thisfile_iso_primaryVD['bibliographic_file_identifier'] = trim($thisfile_iso_primaryVD_raw['bibliographic_file_identifier']);
$thisfile_iso_primaryVD['volume_creation_date_time'] = $this->ISOtimeText2UNIXtime($thisfile_iso_primaryVD_raw['volume_creation_date_time']);
$thisfile_iso_primaryVD['volume_modification_date_time'] = $this->ISOtimeText2UNIXtime($thisfile_iso_primaryVD_raw['volume_modification_date_time']);
$thisfile_iso_primaryVD['volume_expiration_date_time'] = $this->ISOtimeText2UNIXtime($thisfile_iso_primaryVD_raw['volume_expiration_date_time']);
$thisfile_iso_primaryVD['volume_effective_date_time'] = $this->ISOtimeText2UNIXtime($thisfile_iso_primaryVD_raw['volume_effective_date_time']);
if (($thisfile_iso_primaryVD_raw['volume_space_size'] * 2048) > $info['filesize']) {
$this->error('Volume Space Size ('.($thisfile_iso_primaryVD_raw['volume_space_size'] * 2048).' bytes) is larger than the file size ('.$info['filesize'].' bytes) (truncated file?)');
}
return true;
}
/**
* @param string $ISOheader
*
* @return bool
*/
public function ParseSupplementaryVolumeDescriptor(&$ISOheader) {
// ISO integer values are stored Both-Endian format!!
// ie 12345 == 0x3039 is stored as $39 $30 $30 $39 in a 4-byte field
// shortcuts
$info = &$this->getid3->info;
$info['iso']['supplementary_volume_descriptor']['raw'] = array();
$thisfile_iso_supplementaryVD = &$info['iso']['supplementary_volume_descriptor'];
$thisfile_iso_supplementaryVD_raw = &$thisfile_iso_supplementaryVD['raw'];
$thisfile_iso_supplementaryVD_raw['volume_descriptor_type'] = getid3_lib::LittleEndian2Int(substr($ISOheader, 0, 1));
$thisfile_iso_supplementaryVD_raw['standard_identifier'] = substr($ISOheader, 1, 5);
if ($thisfile_iso_supplementaryVD_raw['standard_identifier'] != 'CD001') {
$this->error('Expected "CD001" at offset ('.($thisfile_iso_supplementaryVD['offset'] + 1).'), found "'.$thisfile_iso_supplementaryVD_raw['standard_identifier'].'" instead');
unset($info['fileformat']);
unset($info['iso']);
return false;
}
$thisfile_iso_supplementaryVD_raw['volume_descriptor_version'] = getid3_lib::LittleEndian2Int(substr($ISOheader, 6, 1));
//$thisfile_iso_supplementaryVD_raw['unused_1'] = substr($ISOheader, 7, 1);
$thisfile_iso_supplementaryVD_raw['system_identifier'] = substr($ISOheader, 8, 32);
$thisfile_iso_supplementaryVD_raw['volume_identifier'] = substr($ISOheader, 40, 32);
//$thisfile_iso_supplementaryVD_raw['unused_2'] = substr($ISOheader, 72, 8);
$thisfile_iso_supplementaryVD_raw['volume_space_size'] = getid3_lib::LittleEndian2Int(substr($ISOheader, 80, 4));
if ($thisfile_iso_supplementaryVD_raw['volume_space_size'] == 0) {
// Supplementary Volume Descriptor not used
//unset($thisfile_iso_supplementaryVD);
//return false;
}
//$thisfile_iso_supplementaryVD_raw['unused_3'] = substr($ISOheader, 88, 32);
$thisfile_iso_supplementaryVD_raw['volume_set_size'] = getid3_lib::LittleEndian2Int(substr($ISOheader, 120, 2));
$thisfile_iso_supplementaryVD_raw['volume_sequence_number'] = getid3_lib::LittleEndian2Int(substr($ISOheader, 124, 2));
$thisfile_iso_supplementaryVD_raw['logical_block_size'] = getid3_lib::LittleEndian2Int(substr($ISOheader, 128, 2));
$thisfile_iso_supplementaryVD_raw['path_table_size'] = getid3_lib::LittleEndian2Int(substr($ISOheader, 132, 4));
$thisfile_iso_supplementaryVD_raw['path_table_l_location'] = getid3_lib::LittleEndian2Int(substr($ISOheader, 140, 2));
$thisfile_iso_supplementaryVD_raw['path_table_l_opt_location'] = getid3_lib::LittleEndian2Int(substr($ISOheader, 144, 2));
$thisfile_iso_supplementaryVD_raw['path_table_m_location'] = getid3_lib::LittleEndian2Int(substr($ISOheader, 148, 2));
$thisfile_iso_supplementaryVD_raw['path_table_m_opt_location'] = getid3_lib::LittleEndian2Int(substr($ISOheader, 152, 2));
$thisfile_iso_supplementaryVD_raw['root_directory_record'] = substr($ISOheader, 156, 34);
$thisfile_iso_supplementaryVD_raw['volume_set_identifier'] = substr($ISOheader, 190, 128);
$thisfile_iso_supplementaryVD_raw['publisher_identifier'] = substr($ISOheader, 318, 128);
$thisfile_iso_supplementaryVD_raw['data_preparer_identifier'] = substr($ISOheader, 446, 128);
$thisfile_iso_supplementaryVD_raw['application_identifier'] = substr($ISOheader, 574, 128);
$thisfile_iso_supplementaryVD_raw['copyright_file_identifier'] = substr($ISOheader, 702, 37);
$thisfile_iso_supplementaryVD_raw['abstract_file_identifier'] = substr($ISOheader, 739, 37);
$thisfile_iso_supplementaryVD_raw['bibliographic_file_identifier'] = substr($ISOheader, 776, 37);
$thisfile_iso_supplementaryVD_raw['volume_creation_date_time'] = substr($ISOheader, 813, 17);
$thisfile_iso_supplementaryVD_raw['volume_modification_date_time'] = substr($ISOheader, 830, 17);
$thisfile_iso_supplementaryVD_raw['volume_expiration_date_time'] = substr($ISOheader, 847, 17);
$thisfile_iso_supplementaryVD_raw['volume_effective_date_time'] = substr($ISOheader, 864, 17);
$thisfile_iso_supplementaryVD_raw['file_structure_version'] = getid3_lib::LittleEndian2Int(substr($ISOheader, 881, 1));
//$thisfile_iso_supplementaryVD_raw['unused_4'] = getid3_lib::LittleEndian2Int(substr($ISOheader, 882, 1));
$thisfile_iso_supplementaryVD_raw['application_data'] = substr($ISOheader, 883, 512);
//$thisfile_iso_supplementaryVD_raw['unused_5'] = substr($ISOheader, 1395, 653);
$thisfile_iso_supplementaryVD['system_identifier'] = trim($thisfile_iso_supplementaryVD_raw['system_identifier']);
$thisfile_iso_supplementaryVD['volume_identifier'] = trim($thisfile_iso_supplementaryVD_raw['volume_identifier']);
$thisfile_iso_supplementaryVD['volume_set_identifier'] = trim($thisfile_iso_supplementaryVD_raw['volume_set_identifier']);
$thisfile_iso_supplementaryVD['publisher_identifier'] = trim($thisfile_iso_supplementaryVD_raw['publisher_identifier']);
$thisfile_iso_supplementaryVD['data_preparer_identifier'] = trim($thisfile_iso_supplementaryVD_raw['data_preparer_identifier']);
$thisfile_iso_supplementaryVD['application_identifier'] = trim($thisfile_iso_supplementaryVD_raw['application_identifier']);
$thisfile_iso_supplementaryVD['copyright_file_identifier'] = trim($thisfile_iso_supplementaryVD_raw['copyright_file_identifier']);
$thisfile_iso_supplementaryVD['abstract_file_identifier'] = trim($thisfile_iso_supplementaryVD_raw['abstract_file_identifier']);
$thisfile_iso_supplementaryVD['bibliographic_file_identifier'] = trim($thisfile_iso_supplementaryVD_raw['bibliographic_file_identifier']);
$thisfile_iso_supplementaryVD['volume_creation_date_time'] = $this->ISOtimeText2UNIXtime($thisfile_iso_supplementaryVD_raw['volume_creation_date_time']);
$thisfile_iso_supplementaryVD['volume_modification_date_time'] = $this->ISOtimeText2UNIXtime($thisfile_iso_supplementaryVD_raw['volume_modification_date_time']);
$thisfile_iso_supplementaryVD['volume_expiration_date_time'] = $this->ISOtimeText2UNIXtime($thisfile_iso_supplementaryVD_raw['volume_expiration_date_time']);
$thisfile_iso_supplementaryVD['volume_effective_date_time'] = $this->ISOtimeText2UNIXtime($thisfile_iso_supplementaryVD_raw['volume_effective_date_time']);
if (($thisfile_iso_supplementaryVD_raw['volume_space_size'] * $thisfile_iso_supplementaryVD_raw['logical_block_size']) > $info['filesize']) {
$this->error('Volume Space Size ('.($thisfile_iso_supplementaryVD_raw['volume_space_size'] * $thisfile_iso_supplementaryVD_raw['logical_block_size']).' bytes) is larger than the file size ('.$info['filesize'].' bytes) (truncated file?)');
}
return true;
}
/**
* @return bool
*/
public function ParsePathTable() {
$info = &$this->getid3->info;
if (!isset($info['iso']['supplementary_volume_descriptor']['raw']['path_table_l_location']) && !isset($info['iso']['primary_volume_descriptor']['raw']['path_table_l_location'])) {
return false;
}
if (isset($info['iso']['supplementary_volume_descriptor']['raw']['path_table_l_location'])) {
$PathTableLocation = $info['iso']['supplementary_volume_descriptor']['raw']['path_table_l_location'];
$PathTableSize = $info['iso']['supplementary_volume_descriptor']['raw']['path_table_size'];
$TextEncoding = 'UTF-16BE'; // Big-Endian Unicode
} else {
$PathTableLocation = $info['iso']['primary_volume_descriptor']['raw']['path_table_l_location'];
$PathTableSize = $info['iso']['primary_volume_descriptor']['raw']['path_table_size'];
$TextEncoding = 'ISO-8859-1'; // Latin-1
}
if (($PathTableLocation * 2048) > $info['filesize']) {
$this->error('Path Table Location specifies an offset ('.($PathTableLocation * 2048).') beyond the end-of-file ('.$info['filesize'].')');
return false;
}
$info['iso']['path_table']['offset'] = $PathTableLocation * 2048;
$this->fseek($info['iso']['path_table']['offset']);
$info['iso']['path_table']['raw'] = $this->fread($PathTableSize);
$offset = 0;
$pathcounter = 1;
$FullPathArray = array();
while ($offset < $PathTableSize) {
// shortcut
$info['iso']['path_table']['directories'][$pathcounter] = array();
$thisfile_iso_pathtable_directories_current = &$info['iso']['path_table']['directories'][$pathcounter];
$thisfile_iso_pathtable_directories_current['length'] = getid3_lib::LittleEndian2Int(substr($info['iso']['path_table']['raw'], $offset, 1));
$offset += 1;
$thisfile_iso_pathtable_directories_current['extended_length'] = getid3_lib::LittleEndian2Int(substr($info['iso']['path_table']['raw'], $offset, 1));
$offset += 1;
$thisfile_iso_pathtable_directories_current['location_logical'] = getid3_lib::LittleEndian2Int(substr($info['iso']['path_table']['raw'], $offset, 4));
$offset += 4;
$thisfile_iso_pathtable_directories_current['parent_directory'] = getid3_lib::LittleEndian2Int(substr($info['iso']['path_table']['raw'], $offset, 2));
$offset += 2;
$thisfile_iso_pathtable_directories_current['name'] = substr($info['iso']['path_table']['raw'], $offset, $thisfile_iso_pathtable_directories_current['length']);
$offset += $thisfile_iso_pathtable_directories_current['length'] + ($thisfile_iso_pathtable_directories_current['length'] % 2);
$thisfile_iso_pathtable_directories_current['name_ascii'] = getid3_lib::iconv_fallback($TextEncoding, $info['encoding'], $thisfile_iso_pathtable_directories_current['name']);
$thisfile_iso_pathtable_directories_current['location_bytes'] = $thisfile_iso_pathtable_directories_current['location_logical'] * 2048;
if ($pathcounter == 1) {
$thisfile_iso_pathtable_directories_current['full_path'] = '/';
} else {
$thisfile_iso_pathtable_directories_current['full_path'] = $info['iso']['path_table']['directories'][$thisfile_iso_pathtable_directories_current['parent_directory']]['full_path'].$thisfile_iso_pathtable_directories_current['name_ascii'].'/';
}
$FullPathArray[] = $thisfile_iso_pathtable_directories_current['full_path'];
$pathcounter++;
}
return true;
}
/**
* @param array $directorydata
*
* @return array
*/
public function ParseDirectoryRecord($directorydata) {
$info = &$this->getid3->info;
if (isset($info['iso']['supplementary_volume_descriptor'])) {
$TextEncoding = 'UTF-16BE'; // Big-Endian Unicode
} else {
$TextEncoding = 'ISO-8859-1'; // Latin-1
}
$this->fseek($directorydata['location_bytes']);
$DirectoryRecordData = $this->fread(1);
$DirectoryRecord = array();
while (ord($DirectoryRecordData[0]) > 33) {
$DirectoryRecordData .= $this->fread(ord($DirectoryRecordData[0]) - 1);
$ThisDirectoryRecord = array();
$ThisDirectoryRecord['raw']['length'] = getid3_lib::LittleEndian2Int(substr($DirectoryRecordData, 0, 1));
$ThisDirectoryRecord['raw']['extended_attribute_length'] = getid3_lib::LittleEndian2Int(substr($DirectoryRecordData, 1, 1));
$ThisDirectoryRecord['raw']['offset_logical'] = getid3_lib::LittleEndian2Int(substr($DirectoryRecordData, 2, 4));
$ThisDirectoryRecord['raw']['filesize'] = getid3_lib::LittleEndian2Int(substr($DirectoryRecordData, 10, 4));
$ThisDirectoryRecord['raw']['recording_date_time'] = substr($DirectoryRecordData, 18, 7);
$ThisDirectoryRecord['raw']['file_flags'] = getid3_lib::LittleEndian2Int(substr($DirectoryRecordData, 25, 1));
$ThisDirectoryRecord['raw']['file_unit_size'] = getid3_lib::LittleEndian2Int(substr($DirectoryRecordData, 26, 1));
$ThisDirectoryRecord['raw']['interleave_gap_size'] = getid3_lib::LittleEndian2Int(substr($DirectoryRecordData, 27, 1));
$ThisDirectoryRecord['raw']['volume_sequence_number'] = getid3_lib::LittleEndian2Int(substr($DirectoryRecordData, 28, 2));
$ThisDirectoryRecord['raw']['file_identifier_length'] = getid3_lib::LittleEndian2Int(substr($DirectoryRecordData, 32, 1));
$ThisDirectoryRecord['raw']['file_identifier'] = substr($DirectoryRecordData, 33, $ThisDirectoryRecord['raw']['file_identifier_length']);
$ThisDirectoryRecord['file_identifier_ascii'] = getid3_lib::iconv_fallback($TextEncoding, $info['encoding'], $ThisDirectoryRecord['raw']['file_identifier']);
$ThisDirectoryRecord['filesize'] = $ThisDirectoryRecord['raw']['filesize'];
$ThisDirectoryRecord['offset_bytes'] = $ThisDirectoryRecord['raw']['offset_logical'] * 2048;
$ThisDirectoryRecord['file_flags']['hidden'] = (bool) ($ThisDirectoryRecord['raw']['file_flags'] & 0x01);
$ThisDirectoryRecord['file_flags']['directory'] = (bool) ($ThisDirectoryRecord['raw']['file_flags'] & 0x02);
$ThisDirectoryRecord['file_flags']['associated'] = (bool) ($ThisDirectoryRecord['raw']['file_flags'] & 0x04);
$ThisDirectoryRecord['file_flags']['extended'] = (bool) ($ThisDirectoryRecord['raw']['file_flags'] & 0x08);
$ThisDirectoryRecord['file_flags']['permissions'] = (bool) ($ThisDirectoryRecord['raw']['file_flags'] & 0x10);
$ThisDirectoryRecord['file_flags']['multiple'] = (bool) ($ThisDirectoryRecord['raw']['file_flags'] & 0x80);
$ThisDirectoryRecord['recording_timestamp'] = $this->ISOtime2UNIXtime($ThisDirectoryRecord['raw']['recording_date_time']);
if ($ThisDirectoryRecord['file_flags']['directory']) {
$ThisDirectoryRecord['filename'] = $directorydata['full_path'];
} else {
$ThisDirectoryRecord['filename'] = $directorydata['full_path'].$this->ISOstripFilenameVersion($ThisDirectoryRecord['file_identifier_ascii']);
$info['iso']['files'] = getid3_lib::array_merge_clobber($info['iso']['files'], getid3_lib::CreateDeepArray($ThisDirectoryRecord['filename'], '/', $ThisDirectoryRecord['filesize']));
}
$DirectoryRecord[] = $ThisDirectoryRecord;
$DirectoryRecordData = $this->fread(1);
}
return $DirectoryRecord;
}
/**
* @param string $ISOfilename
*
* @return string
*/
public function ISOstripFilenameVersion($ISOfilename) {
// convert 'filename.ext;1' to 'filename.ext'
if (!strstr($ISOfilename, ';')) {
return $ISOfilename;
} else {
return substr($ISOfilename, 0, strpos($ISOfilename, ';'));
}
}
/**
* @param string $ISOtime
*
* @return int|false
*/
public function ISOtimeText2UNIXtime($ISOtime) {
$UNIXyear = (int) substr($ISOtime, 0, 4);
$UNIXmonth = (int) substr($ISOtime, 4, 2);
$UNIXday = (int) substr($ISOtime, 6, 2);
$UNIXhour = (int) substr($ISOtime, 8, 2);
$UNIXminute = (int) substr($ISOtime, 10, 2);
$UNIXsecond = (int) substr($ISOtime, 12, 2);
if (!$UNIXyear) {
return false;
}
return gmmktime($UNIXhour, $UNIXminute, $UNIXsecond, $UNIXmonth, $UNIXday, $UNIXyear);
}
/**
* @param string $ISOtime
*
* @return int
*/
public function ISOtime2UNIXtime($ISOtime) {
// Represented by seven bytes:
// 1: Number of years since 1900
// 2: Month of the year from 1 to 12
// 3: Day of the Month from 1 to 31
// 4: Hour of the day from 0 to 23
// 5: Minute of the hour from 0 to 59
// 6: second of the minute from 0 to 59
// 7: Offset from Greenwich Mean Time in number of 15 minute intervals from -48 (West) to +52 (East)
$UNIXyear = ord($ISOtime[0]) + 1900;
$UNIXmonth = ord($ISOtime[1]);
$UNIXday = ord($ISOtime[2]);
$UNIXhour = ord($ISOtime[3]);
$UNIXminute = ord($ISOtime[4]);
$UNIXsecond = ord($ISOtime[5]);
$GMToffset = $this->TwosCompliment2Decimal(ord($ISOtime[5]));
return gmmktime($UNIXhour, $UNIXminute, $UNIXsecond, $UNIXmonth, $UNIXday, $UNIXyear);
}
/**
* @param int $BinaryValue
*
* @return int
*/
public function TwosCompliment2Decimal($BinaryValue) {
// http://sandbox.mc.edu/~bennet/cs110/tc/tctod.html
// First check if the number is negative or positive by looking at the sign bit.
// If it is positive, simply convert it to decimal.
// If it is negative, make it positive by inverting the bits and adding one.
// Then, convert the result to decimal.
// The negative of this number is the value of the original binary.
if ($BinaryValue & 0x80) {
// negative number
return (0 - ((~$BinaryValue & 0xFF) + 1));
} else {
// positive number
return $BinaryValue;
}
}
}