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<?php
namespace PhpZip\Extra\Fields;
use PhpZip\Exception\RuntimeException;
use PhpZip\Extra\ExtraField;
use PhpZip\Model\ZipEntry;
use PhpZip\Util\PackUtil;
/**
* ZIP64 Extra Field
*
* @see https://pkware.cachefly.net/webdocs/casestudies/APPNOTE.TXT .ZIP File Format Specification
* @author Ne-Lexa alexey@nelexa.ru
* @license MIT
*/
class Zip64ExtraField implements ExtraField
{
/** The Header ID for a ZIP64 Extended Information Extra Field. */
const ZIP64_HEADER_ID = 0x0001;
/**
* @var ZipEntry
*/
protected $entry;
/**
* Zip64ExtraField constructor.
* @param ZipEntry $entry
*/
public function __construct(ZipEntry $entry = null)
{
if (null !== $entry) {
$this->setEntry($entry);
}
}
/**
* @param ZipEntry $entry
*/
public function setEntry(ZipEntry $entry)
{
$this->entry = $entry;
}
/**
* Returns the Header ID (type) of this Extra Field.
* The Header ID is an unsigned short integer (two bytes)
* which must be constant during the life cycle of this object.
*
* @return int
*/
public static function getHeaderId()
{
return 0x0001;
}
/**
* Serializes a Data Block.
* @return string
* @throws RuntimeException
*/
public function serialize()
{
if (null === $this->entry) {
throw new RuntimeException("entry is null");
}
$data = '';
// Write out Uncompressed Size.
$size = $this->entry->getSize();
if (0xffffffff <= $size) {
$data .= PackUtil::packLongLE($size);
}
// Write out Compressed Size.
$compressedSize = $this->entry->getCompressedSize();
if (0xffffffff <= $compressedSize) {
$data .= PackUtil::packLongLE($compressedSize);
}
// Write out Relative Header Offset.
$offset = $this->entry->getOffset();
if (0xffffffff <= $offset) {
$data .= PackUtil::packLongLE($offset);
}
return $data;
}
/**
* Initializes this Extra Field by deserializing a Data Block.
* @param string $data
* @throws RuntimeException
*/
public function deserialize($data)
{
if (null === $this->entry) {
throw new RuntimeException("entry is null");
}
$off = 0;
// Read in Uncompressed Size.
$size = $this->entry->getSize();
if (0xffffffff <= $size) {
assert(0xffffffff === $size);
$this->entry->setSize(PackUtil::unpackLongLE(substr($data, $off, 8)));
$off += 8;
}
// Read in Compressed Size.
$compressedSize = $this->entry->getCompressedSize();
if (0xffffffff <= $compressedSize) {
assert(0xffffffff === $compressedSize);
$this->entry->setCompressedSize(PackUtil::unpackLongLE(substr($data, $off, 8)));
$off += 8;
}
// Read in Relative Header Offset.
$offset = $this->entry->getOffset();
if (0xffffffff <= $offset) {
assert(0xffffffff, $offset);
$this->entry->setOffset(PackUtil::unpackLongLE(substr($data, $off, 8)));
}
}
}
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