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<?php |
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declare(strict_types=1); |
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namespace PhpIso; |
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use PhpIso\Descriptor\Reader; |
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use PhpIso\Descriptor\Type; |
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use PhpIso\Descriptor\UdfDescriptor; |
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use PhpIso\Descriptor\UdfTeaDescriptor; |
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class IsoFile |
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{ |
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/** |
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* @var array<int, Descriptor> |
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*/ |
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public array $descriptors = []; |
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/** |
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* @var ?resource |
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*/ |
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protected mixed $fileHandle; |
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public function __construct(protected string $isoFilePath) |
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{ |
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$this->openFile(); |
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$this->processFile(); |
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} |
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public function __destruct() |
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{ |
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$this->closeFile(); |
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} |
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public function seek(int $offset, int $whence = SEEK_SET): int |
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{ |
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if ($this->fileHandle === null) { |
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1 |
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return -1; |
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} |
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return fseek($this->fileHandle, $offset, $whence); |
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} |
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public function read(int $length): string|false |
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{ |
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if ($length < 1) { |
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return false; |
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} |
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20 |
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if ($this->fileHandle === null) { |
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return false; |
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} |
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return fread($this->fileHandle, $length); |
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} |
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public function openFile(): void |
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{ |
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if (file_exists($this->isoFilePath) === false) { |
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throw new Exception('File does not exist: ' . $this->isoFilePath); |
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} |
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$fileHandle = fopen($this->isoFilePath, 'rb'); |
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if ($fileHandle === false) { |
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throw new Exception('Cannot open file for reading: ' . $this->isoFilePath); |
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} |
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$this->fileHandle = $fileHandle; |
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} |
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public function closeFile(): void |
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{ |
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if ($this->fileHandle === null) { |
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return; |
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} |
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fclose($this->fileHandle); |
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$this->fileHandle = null; |
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} |
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protected function processFile(): bool |
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{ |
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if ($this->seek(16 * 2048, SEEK_SET) === -1) { |
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return false; |
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} |
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$reader = new Reader($this); |
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$foundTerminator = false; |
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while (true) { |
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try { |
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$descriptor = $reader->read(); |
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if ($descriptor === null) { |
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throw new Exception('Finished reading'); |
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} |
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if (isset($this->descriptors[$descriptor->getType()]) && ! ($descriptor instanceof UdfDescriptor)) { |
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throw new Exception('Descriptor ' . $descriptor->getType() . ' already exists'); |
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} |
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$this->descriptors[$descriptor->getType()] = $descriptor; |
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} catch (Exception $ex) { |
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if ($foundTerminator) { |
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break; |
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} |
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throw $ex; |
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} |
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// If it's a UDF descriptor, handle it separately |
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if ($descriptor instanceof UdfDescriptor) { |
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if ($descriptor instanceof UdfTeaDescriptor) { |
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break; // Stop at Terminating Extended Area Descriptor |
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} |
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} else { |
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if ($foundTerminator) { |
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break; |
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} |
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} |
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if ($descriptor->getType() === Type::TERMINATOR_DESC) { |
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if ($foundTerminator) { |
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break; |
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} |
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17 |
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$foundTerminator = true; |
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// Keep going if UDF might still be present |
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continue; |
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} |
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} |
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19 |
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return count($this->descriptors) > 0; |
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} |
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} |
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indy2kro /
php-iso
