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<?php declare(strict_types=1); |
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namespace DaveRandom\LibLifxLan\Decoding; |
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use DaveRandom\LibLifxLan\Decoding\Exceptions\DecodingException; |
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use DaveRandom\LibLifxLan\Decoding\Exceptions\InsufficientDataException; |
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use DaveRandom\LibLifxLan\Header\Frame; |
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use DaveRandom\LibLifxLan\Header\FrameAddress; |
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use DaveRandom\LibLifxLan\Header\Header; |
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final class HeaderDecoder |
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{ |
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private const FRAME_OFFSET = 0; |
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private const FRAME_ADDRESS_OFFSET = self::FRAME_OFFSET + Frame::WIRE_SIZE; |
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private const PROTOCOL_HEADER_OFFSET = self::FRAME_ADDRESS_OFFSET + FrameAddress::WIRE_SIZE; |
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private $frameDecoder; |
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private $frameAddressDecoder; |
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private $protocolHeaderDecoder; |
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public function __construct(FrameDecoder $frameDecoder = null, FrameAddressDecoder $frameAddressDecoder = null, ProtocolHeaderDecoder $protocolHeaderDecoder = null) |
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{ |
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$this->frameDecoder = $frameDecoder ?? new FrameDecoder; |
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$this->frameAddressDecoder = $frameAddressDecoder ?? new FrameAddressDecoder; |
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$this->protocolHeaderDecoder = $protocolHeaderDecoder ?? new ProtocolHeaderDecoder; |
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} |
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public function getFrameDecoder(): FrameDecoder |
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{ |
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return $this->frameDecoder; |
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} |
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public function getFrameAddressDecoder(): FrameAddressDecoder |
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{ |
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return $this->frameAddressDecoder; |
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} |
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public function getProtocolHeaderDecoder(): ProtocolHeaderDecoder |
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{ |
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return $this->protocolHeaderDecoder; |
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} |
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/** |
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* @param string $data |
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* @param int $offset |
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* @return Header |
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* @throws DecodingException |
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*/ |
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public function decodeHeader(string $data, int $offset = 0): Header |
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{ |
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if ((\strlen($data) - $offset) < Header::WIRE_SIZE) { |
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throw new InsufficientDataException( |
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"Header requires " . Header::WIRE_SIZE . " bytes, got " . (\strlen($data) - $offset) . " bytes" |
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); |
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} |
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$frame = $this->frameDecoder->decodeFrame($data, $offset + self::FRAME_OFFSET); |
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$frameAddress = $this->frameAddressDecoder->decodeFrameAddress($data, $offset + self::FRAME_ADDRESS_OFFSET); |
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$protocolHeader = $this->protocolHeaderDecoder->decodeProtocolHeader($data, $offset + self::PROTOCOL_HEADER_OFFSET); |
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return new Header($frame, $frameAddress, $protocolHeader); |
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} |
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} |
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DaveRandom /
LibLifxLan
