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<?php |
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declare(strict_types=1); |
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namespace BitWasp\Buffertools\Types; |
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use BitWasp\Buffertools\Buffer; |
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use BitWasp\Buffertools\BufferInterface; |
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use BitWasp\Buffertools\ByteOrder; |
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use BitWasp\Buffertools\Parser; |
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class ByteString extends AbstractType |
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{ |
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/** |
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* @var int|string |
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*/ |
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private $length; |
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/** |
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* @param int $length |
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* @param int $byteOrder |
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*/ |
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public function __construct(int $length, int $byteOrder = ByteOrder::BE) |
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{ |
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$this->length = $length; |
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parent::__construct($byteOrder); |
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} |
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/** |
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* @param BufferInterface $string |
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* @return string |
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*/ |
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public function writeBits(BufferInterface $string): string |
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{ |
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$bits = str_pad( |
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gmp_strval(gmp_init($string->getHex(), 16), 2), |
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$this->length * 8, |
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'0', |
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STR_PAD_LEFT |
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); |
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return $bits; |
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} |
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/** |
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* @param Buffer $string |
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* @return string |
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* @throws \Exception |
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*/ |
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public function write($string): string |
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{ |
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if (!($string instanceof Buffer)) { |
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throw new \InvalidArgumentException('FixedLengthString::write() must be passed a Buffer'); |
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} |
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$bits = $this->isBigEndian() |
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? $this->writeBits($string) |
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: $this->flipBits($this->writeBits($string)); |
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$hex = str_pad( |
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gmp_strval(gmp_init($bits, 2), 16), |
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$this->length * 2, |
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'0', |
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STR_PAD_LEFT |
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); |
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return pack("H*", $hex); |
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} |
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/** |
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* @param BufferInterface $buffer |
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* @return string |
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*/ |
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public function readBits(BufferInterface $buffer): string |
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{ |
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return str_pad( |
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gmp_strval(gmp_init($buffer->getHex(), 16), 2), |
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$this->length * 8, |
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'0', |
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STR_PAD_LEFT |
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); |
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} |
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/** |
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* @param Parser $parser |
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* @return BufferInterface |
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* @throws \BitWasp\Buffertools\Exceptions\ParserOutOfRange |
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*/ |
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public function read(Parser $parser): BufferInterface |
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{ |
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$bits = $this->readBits($parser->readBytes($this->length)); |
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if (!$this->isBigEndian()) { |
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$bits = $this->flipBits($bits); |
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} |
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return Buffer::hex( |
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str_pad( |
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gmp_strval(gmp_init($bits, 2), 16), |
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$this->length * 2, |
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'0', |
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STR_PAD_LEFT |
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), |
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$this->length |
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); |
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} |
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} |
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Bit-Wasp /
buffertools-php
