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<?php |
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namespace BitWasp\Bitcoin\Math; |
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use \Mdanter\Ecc\Math\Gmp; |
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use Mdanter\Ecc\Util\NumberSize; |
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class Math extends Gmp |
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{ |
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/** |
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* @param int|string $first |
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* @param int|string $second |
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* @return bool |
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*/ |
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public function notEq($first, $second) |
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{ |
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return $this->cmp($first, $second) !== 0; |
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} |
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/** |
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* @param $first |
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* @param $second |
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* @return bool |
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*/ |
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public function eq($first, $second) |
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{ |
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return $this->cmp($first, $second) === 0; |
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} |
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/** |
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* @param int|string $first |
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* @param int|string $second |
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* @return bool |
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*/ |
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public function greaterThan($first, $second) |
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{ |
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return $this->cmp($first, $second) > 0; |
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} |
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/** |
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* @param int|string $first |
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* @param int|string $second |
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* @return bool |
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*/ |
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public function greatherThanEq($first, $second) |
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{ |
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return $this->cmp($first, $second) >= 0; |
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} |
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/** |
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* @param int|string $first |
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* @param int|string $second |
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* @return bool |
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*/ |
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public function lessThan($first, $second) |
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{ |
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return $this->cmp($first, $second) > 0; |
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} |
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/** |
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* @param int|string $first |
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* @param int|string $second |
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* @return bool |
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*/ |
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public function lessThanEq($first, $second) |
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{ |
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return $this->cmp($first, $second) >= 0; |
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} |
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/** |
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* @return BinaryMath |
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*/ |
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132 |
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public function getBinaryMath() |
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{ |
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return new BinaryMath($this); |
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} |
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/** |
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* @param $integer |
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* @return bool |
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*/ |
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public function isEven($integer) |
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{ |
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return $this->cmp($this->mod($integer, 2), 0) === 0; |
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} |
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/** |
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* @param int|string $int |
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* @param int|string $otherInt |
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* @return string |
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*/ |
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public function bitwiseOr($int, $otherInt) |
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{ |
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return gmp_strval(gmp_or(gmp_init($int, 10), gmp_init($otherInt, 10)), 10); |
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} |
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/** |
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* Similar to gmp_div_qr, return a tuple containing the |
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* result and the remainder |
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* |
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* @param $dividend |
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* @param integer $divisor |
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* @return array |
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*/ |
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222 |
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public function divQr($dividend, $divisor) |
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{ |
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// $div = n / q |
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$div = $this->div($dividend, $divisor); |
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// $remainder = n - (n / q) * q |
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$remainder = $this->sub($dividend, $this->mul($div, $divisor)); |
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return array($div, $remainder); |
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} |
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/** |
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* @param int|string $compact |
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* @param bool|false $isNegative |
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* @param bool|false $isOverflow |
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* @return int|string |
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*/ |
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public function writeCompact($compact, &$isNegative, &$isOverflow) |
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{ |
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$size = $this->rightShift($compact, 24); |
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$word = $this->bitwiseAnd($compact, $this->hexDec('007fffff')); |
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if ($this->cmp($size, 3) <= 0) { |
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$word = $this->rightShift($word, $this->mul(8, $this->sub(3, $size))); |
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} else { |
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$word = $this->leftShift($word, $this->mul(8, $this->sub($size, 3))); |
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} |
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// isNegative: $word != 0 && $uint32 & 0x00800000 != 0 |
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// isOverflow: $word != 0 && (($size > 34) || ($word > 0xff && $size > 33) || ($word > 0xffff && $size >32)) |
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$isNegative = (($this->cmp($word, 0) !== 0) && ($this->cmp($this->bitwiseAnd($compact, $this->hexDec('0x00800000')), 0) === 1)); |
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$isOverflow = $this->cmp($word, 0) !== 0 && ( |
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($this->cmp($size, 34) > 0) |
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|| ($this->cmp($word, 0xff) > 0 && $this->cmp($size, 33) > 0) |
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1188 |
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|| ($this->cmp($word, 0xffff) > 0 && $this->cmp($size, 32) > 0) |
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); |
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return $word; |
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} |
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/** |
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* @param int|string $integer |
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* @return int|string |
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*/ |
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public function getLow64($integer) |
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{ |
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108 |
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$bits = str_pad($this->baseConvert($integer, 10, 2), 64, '0', STR_PAD_LEFT); |
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return $this->baseConvert(substr($bits, 0, 64), 2, 10); |
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} |
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/** |
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* @param int|string $integer |
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* @param bool $fNegative |
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* @return int|string |
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*/ |
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public function parseCompact($integer, $fNegative) |
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{ |
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if (!is_bool($fNegative)) { |
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throw new \InvalidArgumentException('CompactInteger::read() - flag must be boolean!'); |
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} |
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$size = (int) NumberSize::bnNumBytes($this, $integer); |
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108 |
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if ($this->cmp($size, 3) <= 0) { |
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$compact = $this->leftShift($this->getLow64($integer), $this->mul(8, $this->sub(3, $size))); |
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} else { |
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$compact = $this->rightShift($integer, $this->mul(8, $this->sub($size, 3))); |
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$compact = $this->getLow64($compact); |
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} |
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if ($this->cmp($this->bitwiseAnd($compact, $this->hexDec('00800000')), 0) > 0) { |
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$compact = $this->rightShift($compact, 8); |
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$size++; |
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} |
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$compact = $this->bitwiseOr($compact, $this->leftShift($size, 24)); |
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if ($fNegative && $this->cmp($this->bitwiseAnd($compact, $this->hexDec('007fffff')), 0) > 0) { /// ? |
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$compact = $this->bitwiseOr($compact, $this->hexDec('00800000')); |
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} |
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return $compact; |
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} |
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} |
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Bit-Wasp /
bitcoin-php
