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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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use PhpBinaryReader\Endian; |
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class Int64 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 $endianBig = 'N'; |
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/** |
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* @var string |
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*/ |
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private $endianLittle = 'V'; |
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/** |
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* Returns an Unsigned 64-bit Integer |
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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(8)) { |
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throw new \OutOfBoundsException('Cannot read 64-bit int, it exceeds the boundary of the file'); |
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} |
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$endian = $br->getEndian() == Endian::ENDIAN_BIG ? $this->endianBig : $this->endianLittle; |
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$firstSegment = $br->readFromHandle(4); |
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$secondSegment = $br->readFromHandle(4); |
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$firstHalf = unpack($endian, $firstSegment)[1]; |
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$secondHalf = unpack($endian, $secondSegment)[1]; |
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if ($br->getEndian() == Endian::ENDIAN_BIG) { |
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$value = bcadd($secondHalf, bcmul($firstHalf, "4294967296")); |
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} else { |
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$value = bcadd($firstHalf, bcmul($secondHalf, "4294967296")); |
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} |
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if ($br->getCurrentBit() != 0) { |
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$value = $this->bitReader($br, $value); |
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} |
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return $value; |
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} |
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/** |
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* Returns a Signed 64-Bit Integer |
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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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$value = $this->read($br); |
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if (bccomp($value, bcpow(2, 63)) >= 0) { |
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$value = bcsub($value, bcpow(2, 64)); |
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} |
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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, $data) |
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{ |
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4 |
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$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() & $hiMask) << 56; |
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$miBits = ($data & 0xFFFFFFFFFFFFFF00) >> (8 - $br->getCurrentBit()); |
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$loBits = ($data & $loMask); |
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$br->setNextByte($data & 0xFF); |
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return $hiBits | $miBits | $loBits; |
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} |
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/** |
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* @param string $endianBig |
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*/ |
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public function setEndianBig($endianBig) |
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{ |
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$this->endianBig = $endianBig; |
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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 getEndianBig() |
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{ |
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return $this->endianBig; |
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} |
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/** |
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* @param string $endianLittle |
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*/ |
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public function setEndianLittle($endianLittle) |
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{ |
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$this->endianLittle = $endianLittle; |
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} |
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/** |
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* @return string |
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*/ |
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public function getEndianLittle() |
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{ |
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return $this->endianLittle; |
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} |
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} |
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mdurrant /
php-binary-reader
