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<?php
/**
* Copyright © Magento, Inc. All rights reserved.
* See COPYING.txt for license details.
*/
declare(strict_types=1);
namespace Magento\MediaGalleryMetadata\Model\Gif;
use Magento\Framework\App\ObjectManager;
use Magento\Framework\Exception\FileSystemException;
use Magento\Framework\Exception\LocalizedException;
use Magento\Framework\App\Filesystem\DirectoryList;
use Magento\Framework\Filesystem\DriverInterface;
use Magento\MediaGalleryMetadata\Model\SegmentNames;
use Magento\MediaGalleryMetadataApi\Model\FileInterface;
use Magento\MediaGalleryMetadataApi\Model\FileInterfaceFactory;
use Magento\MediaGalleryMetadataApi\Model\ReadFileInterface;
use Magento\MediaGalleryMetadataApi\Model\SegmentInterface;
use Magento\MediaGalleryMetadataApi\Model\SegmentInterfaceFactory;
use Magento\Framework\Exception\ValidatorException;
use Magento\Framework\Filesystem;
/**
* File segments reader
*/
class ReadFile implements ReadFileInterface
{
/**
* @var DriverInterface
*/
private $driver;
/**
* @var Filesystem
*/
private $filesystem;
/**
* @var SegmentInterfaceFactory
*/
private $segmentFactory;
/**
* @var FileInterfaceFactory
*/
private $fileFactory;
/**
* @var SegmentNames
*/
private $segmentNames;
/**
* @param DriverInterface $driver
* @param FileInterfaceFactory $fileFactory
* @param SegmentInterfaceFactory $segmentFactory
* @param SegmentNames $segmentNames
* @param Filesystem|null $filesystem
* @SuppressWarnings(PHPMD.UnusedFormalParameter)
*/
public function __construct(
DriverInterface $driver,
FileInterfaceFactory $fileFactory,
SegmentInterfaceFactory $segmentFactory,
SegmentNames $segmentNames,
Filesystem $filesystem = null
) {
$this->fileFactory = $fileFactory;
$this->segmentFactory = $segmentFactory;
$this->segmentNames = $segmentNames;
$this->filesystem = $filesystem ?? ObjectManager::getInstance()->get(Filesystem::class);
}
/**
* @inheritdoc
*/
public function execute(string $path): FileInterface
{
$resource = $this->getDriver()->fileOpen($path, 'rb');
$header = $this->read($resource, 3);
if ($header != "GIF") {
$this->getDriver()->fileClose($resource);
throw new ValidatorException(__('Not a GIF image'));
}
$version = $this->read($resource, 3);
if (!in_array($version, ['87a', '89a'])) {
$this->getDriver()->fileClose($resource);
throw new LocalizedException(__('Unexpected GIF version'));
}
$headerSegment = $this->segmentFactory->create([
'name' => 'header',
'data' => $header . $version
]);
$width = $this->read($resource, 2);
$height = $this->read($resource, 2);
$bitPerPixelBinary = $this->read($resource, 1);
$bitPerPixel = $this->getBitPerPixel($bitPerPixelBinary);
$backgroundAndAspectRatio = $this->read($resource, 2);
$globalColorTable = $this->getGlobalColorTable($resource, $bitPerPixel);
$generalSegment = $this->segmentFactory->create([
'name' => 'header2',
'data' => $width . $height . $bitPerPixelBinary . $backgroundAndAspectRatio . $globalColorTable
]);
$segments = $this->getSegments($resource);
array_unshift($segments, $headerSegment, $generalSegment);
$this->getDriver()->fileClose($resource);
return $this->fileFactory->create([
'path' => $path,
'segments' => $segments
]);
}
/**
* Read gif segments
*
* @param resource $resource
* @return SegmentInterface[]
* @throws FileSystemException
*/
private function getSegments($resource): array
{
$gifFrameSeparator = pack("C", ord(","));
$gifExtensionSeparator = pack("C", ord("!"));
$gifTerminator = pack("C", ord(";"));
$segments = [];
do {
$separator = $this->read($resource, 1);
if ($separator == $gifTerminator) {
return $segments;
}
if ($separator == $gifFrameSeparator) {
$segments[] = $this->segmentFactory->create([
'name' => 'frame',
'data' => $gifFrameSeparator . $this->readFrame($resource)
]);
continue;
}
if ($separator != $gifExtensionSeparator) {
throw new LocalizedException(__('The file is corrupted'));
}
$segments[] = $this->getExtensionSegment($resource);
} while (!$this->getDriver()->endOfFile($resource));
return $segments;
}
/**
* Read extension segment
*
* @param resource $resource
* @return SegmentInterface
* @throws FileSystemException
*/
private function getExtensionSegment($resource): SegmentInterface
{
$gifExtensionSeparator = pack("C", ord("!"));
$extensionCodeBinary = $this->read($resource, 1);
//phpcs:ignore Magento2.Functions.DiscouragedFunction
$extensionCode = unpack('C', $extensionCodeBinary)[1];
if ($extensionCode == 0xF9) {
return $this->segmentFactory->create([
'name' => 'Graphics Control Extension',
'data' => $gifExtensionSeparator . $extensionCodeBinary . $this->readBlock($resource)
]);
}
if ($extensionCode == 0xFE) {
return $this->segmentFactory->create([
'name' => 'comment',
'data' => $gifExtensionSeparator . $extensionCodeBinary . $this->readBlock($resource)
]);
}
if ($extensionCode != 0xFF) {
return $this->segmentFactory->create([
'name' => 'Programm extension',
'data' => $gifExtensionSeparator . $extensionCodeBinary . $this->readBlock($resource)
]);
}
$blockLengthBinary = $this->read($resource, 1);
//phpcs:ignore Magento2.Functions.DiscouragedFunction
$blockLength = unpack('C', $blockLengthBinary)[1];
$name = $this->read($resource, $blockLength);
if ($blockLength != 11) {
throw new LocalizedException(__('The file is corrupted'));
}
if ($name == 'XMP DataXMP') {
return $this->segmentFactory->create([
'name' => $name,
'data' => $gifExtensionSeparator . $extensionCodeBinary . $blockLengthBinary
. $name . $this->readBlockWithSubblocks($resource)
]);
}
return $this->segmentFactory->create([
'name' => $name,
'data' => $gifExtensionSeparator . $extensionCodeBinary . $blockLengthBinary
. $name . $this->readBlock($resource)
]);
}
/**
* Read gif frame
*
* @param resource $resource
* @return string
* @throws FileSystemException
*/
private function readFrame($resource): string
{
$boundingBox = $this->read($resource, 8);
$bitPerPixelBinary = $this->read($resource, 1);
$bitPerPixel = $this->getBitPerPixel($bitPerPixelBinary);
$globalColorTable = $this->getGlobalColorTable($resource, $bitPerPixel);
return $boundingBox . $bitPerPixelBinary . $globalColorTable . $this->read($resource, 1)
. $this->readBlockWithSubblocks($resource);
}
/**
* Retrieve bits per pixel value
*
* @param string $data
* @return int
*/
private function getBitPerPixel(string $data): int
{
//phpcs:ignore Magento2.Functions.DiscouragedFunction
$bitPerPixel = unpack('C', $data)[1];
$bpp = ($bitPerPixel & 7) + 1;
$bitPerPixel >>= 7;
$haveMap = $bitPerPixel & 1;
return $haveMap ? $bpp : 0;
}
/**
* Read global color table
*
* @param resource $resource
* @param int $bitPerPixel
* @return string
* @throws FileSystemException
*/
private function getGlobalColorTable($resource, int $bitPerPixel): string
{
$globalColorTable = '';
if ($bitPerPixel > 0) {
$max = pow(2, $bitPerPixel);
for ($i = 1; $i <= $max; ++$i) {
$globalColorTable .= $this->read($resource, 3);
}
}
return $globalColorTable;
}
/**
* Read wrapper
*
* @param resource $resource
* @param int $length
* @return string
* @throws FileSystemException
*/
private function read($resource, int $length): string
{
$data = '';
while (!$this->getDriver()->endOfFile($resource) && strlen($data) < $length) {
$data .= $this->getDriver()->fileRead($resource, $length - strlen($data));
}
return $data;
}
/**
* Read the block stored in multiple sections
*
* @param resource $resource
* @return string
* @throws FileSystemException
*/
private function readBlockWithSubblocks($resource): string
{
$data = '';
$subLength = $this->read($resource, 1);
while ($subLength !== "\0") {
$data .= $subLength . $this->read($resource, ord($subLength));
$subLength = $this->read($resource, 1);
}
return $data . $subLength;
}
/**
* Read gif block
*
* @param resource $resource
* @return string
* @throws FileSystemException]
*/
private function readBlock($resource): string
{
$blockLengthBinary = $this->read($resource, 1);
$blockLength = ord($blockLengthBinary);
if ($blockLength == 0) {
return '';
}
return $blockLengthBinary . $this->read($resource, $blockLength) . $this->read($resource, 1);
}
/**
* Returns current driver for media directory
*
* @return DriverInterface
* @throws FileSystemException
*/
private function getDriver(): DriverInterface
{
if ($this->driver === null) {
$this->driver = $this->filesystem->getDirectoryWrite(DirectoryList::MEDIA)->getDriver();
}
return $this->driver;
}
}