/**
* Singleton pattern
*
* @return QR_Util
*/
public static function getInstance()
{
if (!self::$instance) {
self::$instance = new self();
}
return self::$instance;
}
/**
* Create bitmap out of the bit buffer using reed solomon blocks
*
* @param QR_BitBuffer $buffer
* @param array $rsBlocks
* @return array
*/
public function createBytes(QR_BitBuffer $buffer, $rsBlocks)
{
$offset = 0;
$maxDcCount = 0;
$maxEcCount = 0;
$dcdata = QR_Util::getInstance()->createEmptyArray(sizeof($rsBlocks));
$ecdata = QR_Util::getInstance()->createEmptyArray(sizeof($rsBlocks));
for ($r = 0; $r < sizeof($rsBlocks); $r++) {
$dcCount = $rsBlocks[$r]->getDataCount();
$ecCount = $rsBlocks[$r]->getTotalCount() - $dcCount;
$maxDcCount = max(array($maxDcCount, $dcCount));
$maxEcCount = max(array($maxEcCount, $ecCount));
$dcdata[$r] = QR_Util::getInstance()->createEmptyArray($dcCount);
for ($i = 0; $i < sizeof($dcdata[$r]); $i++) {
$dcdata[$r][$i] = 0xff & $buffer->getAt($i + $offset);
}
$offset += $dcCount;
$rsPoly = QR_Util::getInstance()->getErrorCorrectPolynominal($ecCount);
$rawPoly = new QR_Polynominal($dcdata[$r], $rsPoly->getLength() - 1);
$modPoly = $rawPoly->mod($rsPoly);
$ecdata[$r] = QR_Util::getInstance()->createEmptyArray($rsPoly->getLength() - 1);
for ($i = 0; $i < sizeof($ecdata[$r]); $i++) {
$modIndex = $i + $modPoly->getLength() - sizeof($ecdata[$r]);
$ecdata[$r][$i] = $modIndex >= 0 ? $modPoly->get($modIndex) : 0;
}
}
$totalCodeCount = 0;
for ($i = 0; $i < sizeof($rsBlocks); $i++) {
$totalCodeCount += $rsBlocks[$i]->getTotalCount();
}
$data = QR_Util::getInstance()->createEmptyArray($totalCodeCount);
$index = 0;
for ($i = 0; $i < $maxDcCount; $i++) {
for ($r = 0; $r < sizeof($rsBlocks); $r++) {
if ($i < sizeof($dcdata[$r])) {
$data[$index++] = $dcdata[$r][$i];
}
}
}
for ($i = 0; $i < $maxEcCount; $i++) {
for ($r = 0; $r < sizeof($rsBlocks); $r++) {
if ($i < sizeof($ecdata[$r])) {
$data[$index++] = $ecdata[$r][$i];
}
}
}
return $data;
}
/**
* Perform modulus against another polynom
*
* @param QR_Polynominal $e
*
* @return QR_Polynominal
*/
public function mod(QR_Polynominal $e)
{
if ($this->getLength() - $e->getLength() < 0) {
return $this;
}
$ratio = QR_Math::getInstance()->glog($this->get(0)) - QR_Math::getInstance()->glog($e->get(0));
$num = QR_Util::getInstance()->createEmptyArray($this->getLength());
for ($i = 0; $i < $this->getLength(); $i++) {
$num[$i] = $this->get($i);
}
for ($i = 0; $i < $e->getLength(); $i++) {
$num[$i] ^= QR_Math::getInstance()->gexp(QR_Math::getInstance()->glog($e->get($i)) + $ratio);
}
$result = new QR_Polynominal($num, 0);
$result = $result->mod($e);
return $result;
}