/**
* @param string $key
* @param string $value
*/
public function set($key, $value)
{
if (strval($key) === '') {
// DBA cross-check hack
return;
}
$this->addbegin(strlen($key), strlen($value));
$this->write($key);
$this->write($value);
$this->addend(strlen($key), strlen($value), Util::hash($key));
}
/**
* @param string $key
* @return bool
*/
protected function findNext($key)
{
if (!$this->loop) {
$u = Util::hash($key);
$buf = $this->read(8, $u << 3 & 2047);
$this->hslots = $this->unpack31(substr($buf, 4));
if (!$this->hslots) {
return false;
}
$this->hpos = $this->unpack31(substr($buf, 0, 4));
$this->khash = $u;
$u = Util::unsignedShiftRight($u, 8);
$u = Util::unsignedMod($u, $this->hslots);
$u <<= 3;
$this->kpos = $this->hpos + $u;
}
while ($this->loop < $this->hslots) {
$buf = $this->read(8, $this->kpos);
$pos = $this->unpack31(substr($buf, 4));
if (!$pos) {
return false;
}
$this->loop += 1;
$this->kpos += 8;
if ($this->kpos == $this->hpos + ($this->hslots << 3)) {
$this->kpos = $this->hpos;
}
$u = $this->unpackSigned(substr($buf, 0, 4));
if ($u === $this->khash) {
$buf = $this->read(8, $pos);
$keyLen = $this->unpack31(substr($buf, 0, 4));
if ($keyLen == strlen($key) && $this->match($key, $pos + 8)) {
// Found
$this->dlen = $this->unpack31(substr($buf, 4));
$this->dpos = $pos + 8 + $keyLen;
return true;
}
}
}
return false;
}
/**
* Search the CDB file for a key.
*
* Sets `dataLen` and `dataPos` properties if successful.
*
* @param string $key
* @return bool Whether the key was found.
*/
protected function find($key)
{
$keyLen = strlen($key);
$u = Util::hash($key);
$upos = $u << 3 & 2047;
$hashSlots = $this->readInt31($upos + 4);
if (!$hashSlots) {
return false;
}
$hashPos = $this->readInt31($upos);
$keyHash = $u;
$u = Util::unsignedShiftRight($u, 8);
$u = Util::unsignedMod($u, $hashSlots);
$u <<= 3;
$keyPos = $hashPos + $u;
for ($i = 0; $i < $hashSlots; $i++) {
$hash = $this->readInt32($keyPos);
$pos = $this->readInt31($keyPos + 4);
if (!$pos) {
return false;
}
$keyPos += 8;
if ($keyPos == $hashPos + ($hashSlots << 3)) {
$keyPos = $hashPos;
}
if ($hash === $keyHash) {
if ($keyLen === $this->readInt31($pos)) {
$dataLen = $this->readInt31($pos + 4);
$dataPos = $pos + 8 + $keyLen;
$foundKey = $this->read($pos + 8, $keyLen);
if ($foundKey === $key) {
// Found
$this->dataLen = $dataLen;
$this->dataPos = $dataPos;
return true;
}
}
}
}
return false;
}
