/**
* @param BlockIndexInterface $prevIndex
* @param int $timeFirstBlock
* @return int
*/
public function calculateNextWorkRequired(BlockIndexInterface $prevIndex, $timeFirstBlock)
{
$header = $prevIndex->getHeader();
$math = $this->math;
$timespan = $this->calculateWorkTimespan($timeFirstBlock, $header);
$negative = false;
$overflow = false;
$target = $math->decodeCompact($header->getBits(), $negative, $overflow);
$limit = $this->math->decodeCompact($this->params->powBitsLimit(), $negative, $overflow);
$new = gmp_init(bcdiv(bcmul($target, $timespan), $this->params->powTargetTimespan()), 10);
if ($math->cmp($new, $limit) > 0) {
$new = $limit;
}
return gmp_strval($math->encodeCompact($new, false), 10);
}
/**
* @param BlockIndex $prevIndex
* @param $timeFirstBlock
* @return int|string
*/
public function calculateNextWorkRequired(BlockIndex $prevIndex, $timeFirstBlock)
{
$header = $prevIndex->getHeader();
$math = $this->math;
$timespan = $math->sub($header->getTimestamp(), $timeFirstBlock);
$lowest = $math->div($this->params->powTargetTimespan(), 4);
$highest = $math->mul($this->params->powTargetTimespan(), 4);
if ($math->cmp($timespan, $lowest) < 0) {
$timespan = $lowest;
}
if ($math->cmp($timespan, $highest) > 0) {
$timespan = $highest;
}
$target = $math->compact()->set($header->getBits()->getInt());
$limit = $this->math->compact()->set($this->params->powBitsLimit());
$new = bcdiv(bcmul($target, $timespan), $this->params->powTargetTimespan());
if ($math->cmp($new, $limit) > 0) {
$new = $limit;
}
return $math->compact()->read($new, false);
}
/**
* @return int|string
*/
public function getMaxTarget()
{
return $this->getTarget(Buffer::int($this->params->powBitsLimit(), 4, $this->math));
}
