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<?php |
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namespace PhpZip\Model\Extra\Fields; |
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use PhpZip\Exception\ZipException; |
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use PhpZip\Model\Extra\ZipExtraField; |
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use PhpZip\Model\ZipEntry; |
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/** |
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* Apk Alignment Extra Field. |
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* |
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* @see https://android.googlesource.com/platform/tools/apksig/+/master/src/main/java/com/android/apksig/ApkSigner.java |
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* @see https://developer.android.com/studio/command-line/zipalign |
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*/ |
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class ApkAlignmentExtraField implements ZipExtraField |
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{ |
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/** |
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* @var int Extensible data block/field header ID used for storing |
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* information about alignment of uncompressed entries as |
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* well as for aligning the entries's data. See ZIP |
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* appnote.txt section 4.5 Extensible data fields. |
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*/ |
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const HEADER_ID = 0xd935; |
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/** |
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* @var int minimum size (in bytes) of the extensible data block/field used |
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* for alignment of uncompressed entries |
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*/ |
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const MIN_SIZE = 6; |
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/** @var int */ |
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const ALIGNMENT_BYTES = 4; |
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/** @var int */ |
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const COMMON_PAGE_ALIGNMENT_BYTES = 4096; |
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/** @var int */ |
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private $multiple; |
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/** @var int */ |
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private $padding; |
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/** |
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* @param int $multiple |
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* @param int $padding |
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*/ |
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public function __construct($multiple, $padding) |
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{ |
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$this->multiple = $multiple; |
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$this->padding = $padding; |
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} |
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/** |
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* Returns the Header ID (type) of this Extra Field. |
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* The Header ID is an unsigned short integer (two bytes) |
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* which must be constant during the life cycle of this object. |
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* |
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* @return int |
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*/ |
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public function getHeaderId() |
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{ |
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return self::HEADER_ID; |
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} |
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/** |
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* @return int |
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*/ |
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public function getMultiple() |
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{ |
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return $this->multiple; |
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} |
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/** |
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* @return int |
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*/ |
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public function getPadding() |
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{ |
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return $this->padding; |
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} |
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/** |
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* @param int $multiple |
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*/ |
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public function setMultiple($multiple) |
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{ |
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$this->multiple = (int) $multiple; |
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} |
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/** |
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* @param int $padding |
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*/ |
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public function setPadding($padding) |
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{ |
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$this->padding = (int) $padding; |
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} |
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/** |
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* Populate data from this array as if it was in local file data. |
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* |
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* @param string $buffer the buffer to read data from |
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* @param ZipEntry|null $entry |
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* |
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* @throws ZipException |
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* |
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* @return ApkAlignmentExtraField |
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*/ |
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public static function unpackLocalFileData($buffer, ZipEntry $entry = null) |
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{ |
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$length = \strlen($buffer); |
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if ($length < 2) { |
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// This is APK alignment field. |
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// FORMAT: |
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// * uint16 alignment multiple (in bytes) |
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// * remaining bytes -- padding to achieve alignment of data which starts after |
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// the extra field |
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throw new ZipException( |
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'Minimum 6 bytes of the extensible data block/field used for alignment of uncompressed entries.' |
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); |
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} |
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$multiple = unpack('v', $buffer)[1]; |
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$padding = $length - 2; |
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return new self($multiple, $padding); |
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} |
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/** |
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* Populate data from this array as if it was in central directory data. |
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* |
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* @param string $buffer the buffer to read data from |
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* @param ZipEntry|null $entry |
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* |
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* @throws ZipException on error |
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* |
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* @return ApkAlignmentExtraField |
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*/ |
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public static function unpackCentralDirData($buffer, ZipEntry $entry = null) |
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{ |
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return self::unpackLocalFileData($buffer, $entry); |
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} |
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/** |
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* The actual data to put into local file data - without Header-ID |
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* or length specifier. |
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* |
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* @return string the data |
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*/ |
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public function packLocalFileData() |
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{ |
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return pack('vx' . $this->padding, $this->multiple); |
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} |
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/** |
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* The actual data to put into central directory - without Header-ID or |
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* length specifier. |
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* |
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* @return string the data |
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*/ |
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public function packCentralDirData() |
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{ |
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return $this->packLocalFileData(); |
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} |
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/** |
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* @return string |
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*/ |
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public function __toString() |
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{ |
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return sprintf( |
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'0x%04x APK Alignment: Multiple=%d Padding=%d', |
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self::HEADER_ID, |
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$this->multiple, |
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$this->padding |
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); |
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} |
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} |
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Ne-Lexa /
php-zip
