public function __construct($handle = null)
{
parent::__construct();
$this->header = parent::HEADER_EXTENDED_TIMESTAMP;
if ($handle != null) {
fread($handle, 2);
$arr = unpack('vlength/cflags', fread($handle, 3));
$this->length = $arr['length'];
$this->flags = $arr['flags'] & 0xff;
$consumed = 1;
$this->isModTimeSet = ZipUtils::testBit($this->flags, 0);
$this->isAcTimeSet = ZipUtils::testBit($this->flags, 1);
$this->isCrTimeSet = ZipUtils::testBit($this->flags, 2);
if ($this->isModTimeSet && $consumed < $this->length) {
$arr = unpack('V', fread($handle, 4));
$this->modTime = $arr[1];
$consumed += 4;
}
if ($this->isAcTimeSet && $consumed < $this->length) {
$arr = unpack('V', fread($handle, 4));
$this->acTime = $arr[1];
$consumed += 4;
}
if ($this->isCrTimeSet && $consumed < $this->length) {
$arr = unpack('V', fread($handle, 4));
$this->crTime = $arr[1];
}
}
}
public function parseHeader($handle)
{
$pk = fread($handle, 4);
if ($pk == AbstractZipHeader::ZIP_LOCAL_FILE_HEADER) {
/*
* local file header signature 4 bytes (0x04034b50)
* version needed to extract 2 bytes
* general purpose bit flag 2 bytes
* compression method 2 bytes
* last mod file time + file date 4 bytes
* crc-32 4 bytes
* compressed size 4 bytes
* uncompressed size 4 bytes
* file name length 2 bytes
* extra field length 2 bytes
* ---------------------------------------
* 30 bytes
*/
$this->offset = (int) ftell($handle) - 4;
$this->versionNeeded = fread($handle, 2);
$arr = unpack("v2wa", fread($handle, 4));
$this->gpFlags = $arr['wa1'];
$this->gzType = $arr['wa2'];
$this->dosTime = fread($handle, 4);
$arr = unpack("V3dwa/v2wa", fread($handle, 16));
$this->fileCRC32 = $arr['dwa1'];
$this->gzLength = $arr['dwa2'];
$this->dataLength = $arr['dwa3'];
$filePathLength = $arr['wa1'];
$localExtraFieldLength = $arr['wa2'];
$this->path = fread($handle, $filePathLength);
$this->dataOffset = 30 + $filePathLength + $localExtraFieldLength;
if ($localExtraFieldLength > 0) {
$eoef = ftell($handle) + $localExtraFieldLength;
while (ftell($handle) < $eoef) {
$ef = AbstractExtraField::decodeField($handle);
/* @var $ef AbstractExtraField */
$this->extraFieldsArray[$ef->header] = $ef;
}
}
$hasDataDescriptor = $this->gpFlags & 4 == 4;
if ($hasDataDescriptor) {
$pkHeader = AbstractZipHeader::seekPKHeader($handle);
if ($pkHeader !== self::ZIP_LOCAL_DATA_DESCRIPTOR) {
fseek($handle, -12, SEEK_CUR);
}
$arr = unpack("Vdwa", fread($handle, 12));
$this->fileCRC32 = $arr['dwa1'];
$this->gzLength = $arr['dwa2'];
$this->dataLength = $arr['dwa3'];
} else {
fseek($handle, $this->gzLength, SEEK_CUR);
}
$this->isDirectory = !$hasDataDescriptor && $this->dataLength == 0 && $this->fileCRC32 == 0;
} else {
if ($pk == AbstractZipHeader::ZIP_CENTRAL_FILE_HEADER) {
/*
*
* central file header signature 4 bytes (0x02014b50)
* version made by 2 bytes
* version needed to extract 2 bytes
* general purpose bit flag 2 bytes
* compression method 2 bytes
* last mod file time 2 bytes
* last mod file date 2 bytes
* crc-32 4 bytes
* compressed size 4 bytes
* uncompressed size 4 bytes
* file name length 2 bytes
* extra field length 2 bytes
* file comment length 2 bytes
* disk number start 2 bytes
* internal file attributes 2 bytes
* external file attributes 4 bytes
* relative offset of local header 4 bytes
* ----------------------------------------
* 46 bytes
*
* file name (variable size)
* extra field (variable size)
* file comment (variable size)
*/
// $this->offset = (int)ftell($handle) - 4;
$this->versionMadeBy = fread($handle, 2);
$this->versionNeeded = fread($handle, 2);
$arr = unpack("v2wa", fread($handle, 4));
$this->gpFlags = $arr['wa1'];
$this->gzType = $arr['wa2'];
$this->dosTime = fread($handle, 4);
$arr = unpack("V3dwa/v3wa", fread($handle, 18));
// $this->fileCRC32 = $arr['dwa1'];
// $this->gzLength = $arr['dwa2'];
// $this->dataLength = $arr['dwa3'];
$filePathLength = $arr['wa1'];
$centralExtraFieldLength = $arr['wa2'];
$fileCommentLength = $arr['wa3'];
$this->discNumberStart = fread($handle, 2);
$this->internalFileAttributes = fread($handle, 2);
$this->externalFileAttributes = fread($handle, 4);
// $arr = unpack("V", fread($handle, 4));
// $this->relativeOffsetOfLocalHeader = $arr[1];
// $this->path = fread($handle, $filePathLength);
fseek($handle, 4 + $filePathLength, SEEK_CUR);
if ($centralExtraFieldLength > 0) {
$eoef = ftell($handle) + $centralExtraFieldLength;
while (ftell($handle) < $eoef) {
$ef = AbstractExtraField::decodeField($handle, false);
/* @var $ef AbstractExtraField */
$ef2 = $this->extraFieldsArray[$ef->header];
if (isset($ef2)) {
$ef2->centralData = $ef->centralData;
} else {
$this->extraFieldsArray[$ef->header] = $ef;
}
}
}
if ($fileCommentLength > 0) {
$this->comment = fread($handle, $fileCommentLength);
}
} else {
fseek($handle, -4, SEEK_CUR);
}
}
}
