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<?php |
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declare(strict_types=1); |
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namespace PhpIso\Descriptor; |
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use PhpIso\Descriptor; |
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use PhpIso\IsoFile; |
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use PhpIso\Util\Buffer; |
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class Reader |
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{ |
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public function __construct(protected IsoFile $isoFile) |
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{ |
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} |
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public function read(): ?Descriptor |
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{ |
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$string = $this->isoFile->read(2048); |
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if ($string === false) { |
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return null; |
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} |
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/** @var array<int, int>|false $bytes */ |
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$bytes = unpack('C*', $string); |
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if ($bytes === false) { |
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return null; |
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} |
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$offset = 1; |
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if (! isset($bytes[$offset])) { |
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1 |
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throw new Exception('Failed to read buffer entry ' . $offset); |
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} |
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$type = $bytes[$offset]; |
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$offset++; |
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$stdId = Buffer::getString($bytes, 5, $offset); |
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if (! isset($bytes[$offset])) { |
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throw new Exception('Failed to read buffer entry ' . $offset); |
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} |
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$version = $bytes[$offset]; |
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$offset++; |
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// Check for UDF-specific descriptors |
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if ($type === Type::BOOT_RECORD_DESC) { |
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$type = match ($stdId) { |
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'CD001' => Type::BOOT_RECORD_DESC, |
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UdfType::BEA01 => Type::UDF_BEA_VOLUME_DESC, |
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UdfType::NSR02 => Type::UDF_NSR2_VOLUME_DESC, |
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UdfType::NSR03 => Type::UDF_NSR3_VOLUME_DESC, |
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UdfType::TEA01 => Type::UDF_TEA_VOLUME_DESC, |
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default => throw new Exception('Failed to detect UDF'), |
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}; |
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} |
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$descriptor = Factory::create($type, $stdId, $version, $bytes); |
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$descriptor->init($this->isoFile, $offset); |
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return $descriptor; |
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} |
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} |
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indy2kro /
php-iso
