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<?php |
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namespace PhpBinaryReader\Type; |
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use PhpBinaryReader\BinaryReader; |
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use PhpBinaryReader\BitMask; |
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class Int8 implements TypeInterface |
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{ |
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/** |
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* @var string |
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*/ |
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private $endian = 'C'; |
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/** |
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* Returns an Unsigned 8-bit Integer (aka a single byte) |
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* |
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* @param \PhpBinaryReader\BinaryReader $br |
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* @param null $length |
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* @return int |
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* @throws \OutOfBoundsException |
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*/ |
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public function read(BinaryReader &$br, $length = null) |
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{ |
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if (!$br->canReadBytes(1)) { |
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throw new \OutOfBoundsException('Cannot read 8-bit int, it exceeds the boundary of the file'); |
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} |
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$segment = $br->readFromHandle(1); |
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$data = unpack($this->endian, $segment); |
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$data = $data[1]; |
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if ($br->getCurrentBit() != 0) { |
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$data = $this->bitReader($br, $data); |
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} |
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return $data; |
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} |
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/** |
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* Returns a Signed 8-bit Integer (aka a single byte) |
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* |
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* @param \PhpBinaryReader\BinaryReader $br |
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* @return int |
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*/ |
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public function readSigned(&$br) |
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{ |
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$this->setEndian('c'); |
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$value = $this->read($br); |
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$this->setEndian('C'); |
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return $value; |
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} |
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/** |
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* @param \PhpBinaryReader\BinaryReader $br |
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* @param int $data |
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* @return int |
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*/ |
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private function bitReader(&$br, $data) |
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{ |
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$bitmask = new BitMask(); |
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$loMask = $bitmask->getMask($br->getCurrentBit(), BitMask::MASK_LO); |
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$hiMask = $bitmask->getMask($br->getCurrentBit(), BitMask::MASK_HI); |
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$hiBits = $br->getNextByte() & $hiMask; |
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$loBits = $data & $loMask; |
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$br->setNextByte($data); |
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return $hiBits | $loBits; |
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} |
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/** |
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* @param string $endian |
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*/ |
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public function setEndian($endian) |
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{ |
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$this->endian = $endian; |
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} |
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/** |
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* @return string |
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*/ |
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1 |
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public function getEndian() |
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{ |
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1 |
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return $this->endian; |
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} |
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} |
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mdurrant /
php-binary-reader
