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<?php declare(strict_types=1); |
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namespace DaveRandom\LibLifxLan\Encoding; |
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use DaveRandom\LibLifxLan\Encoding\Exceptions\InvalidMessageHeaderException; |
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use DaveRandom\LibLifxLan\Header\Frame; |
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use DaveRandom\LibLifxLan\Options; |
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final class FrameEncoder |
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{ |
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use Options; |
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/** |
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* If enabled, allow origin values other than 0 |
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*/ |
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public const OP_ALLOW_ORIGIN_VARIANCE = 0b01; |
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/** |
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* If enabled, allow protocol numbers other than 1024 |
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*/ |
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public const OP_ALLOW_PROTOCOL_NUMBER_VARIANCE = 0b10; |
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/** |
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* @param Frame $frame |
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* @return string |
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*/ |
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private function encodeMessageSize(Frame $frame): string |
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{ |
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return \pack('v', $frame->getSize()); |
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} |
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/** |
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* @param Frame $frame |
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* @return int |
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* @throws InvalidMessageHeaderException |
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*/ |
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private function getValidOrigin(Frame $frame): int |
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{ |
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$origin = $frame->getOrigin(); |
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if ($origin !== 0 && !$this->options[self::OP_ALLOW_ORIGIN_VARIANCE]) { |
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throw new InvalidMessageHeaderException("Message origin value expected to be 0, got {$origin}"); |
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} |
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return $origin << 14; |
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} |
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private function getFlags(Frame $frame): int |
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{ |
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return (((int)$frame->isTagged()) << 13) | (((int)$frame->isAddressable()) << 12); |
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} |
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/** |
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* @param Frame $frame |
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* @return int |
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* @throws InvalidMessageHeaderException |
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*/ |
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private function getValidProtocolNumber(Frame $frame): int |
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{ |
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$protocolNo = $frame->getProtocolNo(); |
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if ($protocolNo !== 1024 && !$this->options[self::OP_ALLOW_PROTOCOL_NUMBER_VARIANCE]) { |
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throw new InvalidMessageHeaderException("Protocol number value expected to be 1024, got {$protocolNo}"); |
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} |
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return $protocolNo; |
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} |
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/** |
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* @param Frame $frame |
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* @return string |
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* @throws InvalidMessageHeaderException |
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*/ |
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private function encodeOriginFlagsAndProtocolNo(Frame $frame): string |
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{ |
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$origin = $this->getValidOrigin($frame); |
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$flags = $this->getFlags($frame); |
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$protocolNo = $this->getValidProtocolNumber($frame); |
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return \pack('v', $origin | $flags | $protocolNo); |
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} |
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/** |
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* @param Frame $frame |
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* @return string |
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*/ |
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private function encodeSource(Frame $frame): string |
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{ |
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return \pack('V', $frame->getSource()); |
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} |
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/** |
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* @param Frame $frame |
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* @return string |
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* @throws InvalidMessageHeaderException |
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*/ |
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public function encodeFrame(Frame $frame): string |
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{ |
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return $this->encodeMessageSize($frame) |
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. $this->encodeOriginFlagsAndProtocolNo($frame) |
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. $this->encodeSource($frame); |
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} |
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public function __construct(array $options = []) |
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{ |
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$this->options = $options + [ |
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self::OP_ALLOW_ORIGIN_VARIANCE => false, |
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self::OP_ALLOW_PROTOCOL_NUMBER_VARIANCE => false, |
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]; |
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} |
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} |
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DaveRandom /
LibLifxLan
