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<?php
namespace Protobuf\Binary\Platform;
/**
* GMP negative values enconding.
*
* @author Iván Montes <drslump@pollinimini.net>
* @author Fabio B. Silva <fabio.bat.silva@gmail.com>
*/
class GmpNegativeEncoder implements NegativeEncoder
{
/**
* @var \GMP
*/
protected $gmp_x00;
/**
* @var \GMP
*/
protected $gmp_x7f;
/**
* @var \GMP
*/
protected $gmp_x80;
/**
* @var \GMP
*/
protected $gmp_xff;
/**
* @var \GMP
*/
protected $gmp_x100;
/**
* @var bool
*/
protected $is32Bit;
/**
* Constructor
*/
public function __construct()
{
$this->gmp_x00 = gmp_init(0x00);
$this->gmp_x7f = gmp_init(0x7f);
$this->gmp_x80 = gmp_init(0x80);
$this->gmp_xff = gmp_init(0xff);
$this->gmp_x100 = gmp_init(0x100);
$this->is32Bit = BigEndian::is32Bit();
}
/**
* {@inheritdoc}
*/
public function encodeVarint($varint)
{
$bytes = [];
$value = $this->is32Bit
? gmp_and($varint, '0x0ffffffffffffffff')
: sprintf('%u', $varint);
while (gmp_cmp($value, $this->gmp_x00) > 0) {
$bytes[] = gmp_intval(gmp_and($value, $this->gmp_x7f)) | 0x80;
$value = gmp_div_q($value, $this->gmp_x80);
}
return $bytes;
}
/**
* {@inheritdoc}
*/
public function encodeSFixed64($sFixed64)
{
$value = $this->is32Bit
? gmp_and($sFixed64, '0x0ffffffffffffffff')
: gmp_init(sprintf('%u', $sFixed64));
$bytes = '';
for ($i = 0; $i < 8; ++$i) {
$bytes .= chr(gmp_intval(gmp_and($value, $this->gmp_xff)));
$value = gmp_div_q($value, $this->gmp_x100);
}
return $bytes;
}
}