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Added Anvil in-place garbage cleaner

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This commit is contained in:
Shoghi Cervantes 2014-04-10 05:58:31 +02:00
parent aa1de79337
commit a1a1f1b8e4
1 changed files with 52 additions and 5 deletions
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57
src/pocketmine/level/format/anvil/RegionLoader.php
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@ -49,11 +49,48 @@ class RegionLoader{
public function __destruct(){
if(is_resource($this->filePointer)){
$this->cleanGarbage();
$this->writeLocationTable();
flock($this->filePointer, LOCK_UN);
fclose($this->filePointer);
}
}
private function cleanGarbage(){
$sectors = array();
foreach($this->locationTable as $index => $data){ //Calculate file usage
if($data[0] === 0 or $data[1] === 0){
$this->locationTable[$index] = array(0, 0);
continue;
}
for($i = 0; $i < $data[1]; ++$i){
$sectors[$data[0]] = $index;
}
}
ksort($sectors);
$shift = 0;
$lastSector = 1; //First chunk - 1
fseek($this->filePointer, 8192);
$sector = 2;
foreach($sectors as $sector => $index){
if(($sector - $lastSector) > 1){
$shift += $sector - $lastSector - 1;
}
if($shift > 0){
fseek($this->filePointer, $sector << 12);
$old = fread($this->filePointer, 4096);
fseek($this->filePointer, ($sector - $shift) << 12);
fwrite($this->filePointer, $old, 4096);
}
$this->locationTable[$index][0] -= $shift;
}
ftruncate($this->filePointer, ($sector + 1) << 12); //Truncate to the end of file written
return $shift;
}
private function loadLocationTable(){
fseek($this->filePointer, 0);
for($i = 0; $i < 1024; ++$i){
@ -62,17 +99,27 @@ class RegionLoader{
}
}
private function writeLocationTable(){
fseek($this->filePointer, 0);
for($i = 0; $i < 1024; ++$i){
fwrite($this->filePointer, Binary::writeInt(($this->locationTable[$i][0] << 8) | $this->locationTable[$i][1]));
}
}
private function writeLocationIndex($index){
fseek($this->filePointer, $index << 2);
fwrite($this->filePointer, Binary::writeInt(($this->locationTable[$index][0] << 8) | $this->locationTable[$index][1]));
}
private function createBlank(){
fseek($this->filePointer, 0);
ftruncate($this->filePointer, 0);
for($i = 0; $i < 1024; ++$i){
$this->locationTable[$i] = array($i, 1);
fwrite($this->filePointer, Binary::writeInt(($i << 8) | 1)); //Default: 1 sector per chunk
$this->locationTable[$i] = array(0, 0);
fwrite($this->filePointer, Binary::writeInt(0));
}
$data = str_pad(Binary::writeInt(-1) . chr(self::COMPRESSION_ZLIB), 4096, "\x00", STR_PAD_RIGHT);
for($i = 0; $i < 1024; ++$i){
fwrite($this->filePointer, $data);
fwrite($this->filePointer, Binary::writeInt(0));
}
}