/**
* @return bool
*/
public function analyze()
{
$info =& $this->getid3->info;
$info['fileformat'] = 'gzip';
$start_length = 10;
$unpack_header = 'a1id1/a1id2/a1cmethod/a1flags/a4mtime/a1xflags/a1os';
//+---+---+---+---+---+---+---+---+---+---+
//|ID1|ID2|CM |FLG| MTIME |XFL|OS |
//+---+---+---+---+---+---+---+---+---+---+
if ($info['filesize'] > $info['php_memory_limit']) {
$info['error'][] = 'File is too large (' . number_format($info['filesize']) . ' bytes) to read into memory (limit: ' . number_format($info['php_memory_limit'] / 1048576) . 'MB)';
return false;
}
fseek($this->getid3->fp, 0);
$buffer = fread($this->getid3->fp, $info['filesize']);
$arr_members = explode(" ‹", $buffer);
while (true) {
$is_wrong_members = false;
$num_members = intval(count($arr_members));
for ($i = 0; $i < $num_members; ++$i) {
if (strlen($arr_members[$i]) == 0) {
continue;
}
$buf = " ‹" . $arr_members[$i];
$attr = unpack($unpack_header, substr($buf, 0, $start_length));
if (!$this->get_os_type(ord($attr['os']))) {
// Merge member with previous if wrong OS type
$arr_members[$i - 1] .= $buf;
$arr_members[$i] = '';
$is_wrong_members = true;
continue;
}
}
if (!$is_wrong_members) {
break;
}
}
$info['gzip']['files'] = array();
$fpointer = 0;
$idx = 0;
for ($i = 0; $i < $num_members; ++$i) {
if (strlen($arr_members[$i]) == 0) {
continue;
}
$thisInfo =& $info['gzip']['member_header'][++$idx];
$buff = " ‹" . $arr_members[$i];
$attr = unpack($unpack_header, substr($buff, 0, $start_length));
$thisInfo['filemtime'] = Helper::LittleEndian2Int($attr['mtime']);
$thisInfo['raw']['id1'] = ord($attr['cmethod']);
$thisInfo['raw']['id2'] = ord($attr['cmethod']);
$thisInfo['raw']['cmethod'] = ord($attr['cmethod']);
$thisInfo['raw']['os'] = ord($attr['os']);
$thisInfo['raw']['xflags'] = ord($attr['xflags']);
$thisInfo['raw']['flags'] = ord($attr['flags']);
$thisInfo['flags']['crc16'] = (bool) ($thisInfo['raw']['flags'] & 0x2);
$thisInfo['flags']['extra'] = (bool) ($thisInfo['raw']['flags'] & 0x4);
$thisInfo['flags']['filename'] = (bool) ($thisInfo['raw']['flags'] & 0x8);
$thisInfo['flags']['comment'] = (bool) ($thisInfo['raw']['flags'] & 0x10);
$thisInfo['compression'] = $this->get_xflag_type($thisInfo['raw']['xflags']);
$thisInfo['os'] = $this->get_os_type($thisInfo['raw']['os']);
if (!$thisInfo['os']) {
$info['error'][] = 'Read error on gzip file';
return false;
}
$fpointer = 10;
$arr_xsubfield = array();
// bit 2 - FLG.FEXTRA
//+---+---+=================================+
//| XLEN |...XLEN bytes of "extra field"...|
//+---+---+=================================+
if ($thisInfo['flags']['extra']) {
$w_xlen = substr($buff, $fpointer, 2);
$xlen = Helper::LittleEndian2Int($w_xlen);
$fpointer += 2;
$thisInfo['raw']['xfield'] = substr($buff, $fpointer, $xlen);
// Extra SubFields
//+---+---+---+---+==================================+
//|SI1|SI2| LEN |... LEN bytes of subfield data ...|
//+---+---+---+---+==================================+
$idx = 0;
while (true) {
if ($idx >= $xlen) {
break;
}
$si1 = ord(substr($buff, $fpointer + $idx++, 1));
$si2 = ord(substr($buff, $fpointer + $idx++, 1));
if ($si1 == 0x41 && $si2 == 0x70) {
$w_xsublen = substr($buff, $fpointer + $idx, 2);
$xsublen = Helper::LittleEndian2Int($w_xsublen);
$idx += 2;
$arr_xsubfield[] = substr($buff, $fpointer + $idx, $xsublen);
$idx += $xsublen;
} else {
break;
}
}
$fpointer += $xlen;
}
// bit 3 - FLG.FNAME
//+=========================================+
//|...original file name, zero-terminated...|
//+=========================================+
// GZIP files may have only one file, with no filename, so assume original filename is current filename without .gz
$thisInfo['filename'] = preg_replace('#\\.gz$#i', '', $info['filename']);
if ($thisInfo['flags']['filename']) {
while (true) {
if (ord($buff[$fpointer]) == 0) {
++$fpointer;
break;
}
$thisInfo['filename'] .= $buff[$fpointer];
++$fpointer;
}
}
// bit 4 - FLG.FCOMMENT
//+===================================+
//|...file comment, zero-terminated...|
//+===================================+
if ($thisInfo['flags']['comment']) {
while (true) {
if (ord($buff[$fpointer]) == 0) {
++$fpointer;
break;
}
$thisInfo['comment'] .= $buff[$fpointer];
++$fpointer;
}
}
// bit 1 - FLG.FHCRC
//+---+---+
//| CRC16 |
//+---+---+
if ($thisInfo['flags']['crc16']) {
$w_crc = substr($buff, $fpointer, 2);
$thisInfo['crc16'] = Helper::LittleEndian2Int($w_crc);
$fpointer += 2;
}
// bit 0 - FLG.FTEXT
//if ($thisInfo['raw']['flags'] & 0x01) {
// Ignored...
//}
// bits 5, 6, 7 - reserved
$thisInfo['crc32'] = Helper::LittleEndian2Int(substr($buff, strlen($buff) - 8, 4));
$thisInfo['filesize'] = Helper::LittleEndian2Int(substr($buff, strlen($buff) - 4));
$info['gzip']['files'] = Helper::array_merge_clobber($info['gzip']['files'], Helper::CreateDeepArray($thisInfo['filename'], '/', $thisInfo['filesize']));
if ($this->option_gzip_parse_contents) {
// Try to inflate GZip
$csize = 0;
$inflated = '';
$chkcrc32 = '';
if (function_exists('gzinflate')) {
$cdata = substr($buff, $fpointer);
$cdata = substr($cdata, 0, strlen($cdata) - 8);
$csize = strlen($cdata);
$inflated = gzinflate($cdata);
// Calculate CRC32 for inflated content
$thisInfo['crc32_valid'] = (bool) (sprintf('%u', crc32($inflated)) == $thisInfo['crc32']);
// determine format
$formattest = substr($inflated, 0, 32774);
$getid3_temp = new GetId3Core();
$determined_format = $getid3_temp->GetFileFormat($formattest);
unset($getid3_temp);
// file format is determined
$determined_format['module'] = isset($determined_format['module']) ? $determined_format['module'] : '';
switch ($determined_format['module']) {
case 'tar':
// view TAR-file info
if (class_exists($determined_format['class'])) {
if (($temp_tar_filename = tempnam(GetId3Core::getTempDir(), 'getID3')) === false) {
// can't find anywhere to create a temp file, abort
$info['error'][] = 'Unable to create temp file to parse TAR inside GZIP file';
break;
}
if ($fp_temp_tar = fopen($temp_tar_filename, 'w+b')) {
fwrite($fp_temp_tar, $inflated);
fclose($fp_temp_tar);
$getid3_temp = new GetId3Core();
$getid3_temp->openfile($temp_tar_filename);
$getid3_tar = new Tar($getid3_temp);
$getid3_tar->analyze();
$info['gzip']['member_header'][$idx]['tar'] = $getid3_temp->info['tar'];
unset($getid3_temp, $getid3_tar);
unlink($temp_tar_filename);
} else {
$info['error'][] = 'Unable to fopen() temp file to parse TAR inside GZIP file';
break;
}
}
break;
case '':
default:
// unknown or unhandled format
break;
}
}
}
}
return true;
}