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RegionLoader: make some error messages more detailed

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This commit is contained in:
Dylan K. Taylor 2019-03-05 11:18:02 +00:00
parent 6f5d4d6b80
commit 55994e08db
1 changed files with 21 additions and 6 deletions
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27
src/pocketmine/level/format/io/region/RegionLoader.php
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@ -142,13 +142,13 @@ class RegionLoader{
if($length >= self::MAX_SECTOR_LENGTH){
$this->locationTable[$index][0] = ++$this->lastSector;
$this->locationTable[$index][1] = 1;
throw new CorruptedChunkException("Corrupted chunk header detected (sector count larger than max)");
throw new CorruptedChunkException("Corrupted chunk header detected (sector count $length larger than max " . self::MAX_SECTOR_LENGTH . ")");
}
return null;
}
if($length > ($this->locationTable[$index][1] << 12)){ //Invalid chunk, bigger than defined number of sectors
MainLogger::getLogger()->error("Corrupted bigger chunk detected (bigger than number of sectors given in header)");
MainLogger::getLogger()->error("Chunk x=$x,z=$z length mismatch (expected " . ($this->locationTable[$index][1] << 12) . " sectors, got $length sectors)");
$this->locationTable[$index][1] = $length >> 12;
$this->writeLocationIndex($index);
}
@ -240,6 +240,16 @@ class RegionLoader{
return $x | ($z << 5);
}
/**
* @param int $offset
* @param int &$x
* @param int &$z
*/
protected static function getChunkCoords(int $offset, ?int &$x, ?int &$z) : void{
$x = $offset & 0x1f;
$z = ($offset >> 5) & 0x1f;
}
/**
* Writes the region header and closes the file
*
@ -265,18 +275,23 @@ class RegionLoader{
}
$data = unpack("N*", $headerRaw);
/** @var int[] $usedOffsets */
$usedOffsets = [];
for($i = 0; $i < 1024; ++$i){
$index = $data[$i + 1];
$offset = $index >> 8;
if($offset !== 0){
fseek($this->filePointer, $offset << 12);
self::getChunkCoords($i, $x, $z);
$fileOffset = $offset << 12;
fseek($this->filePointer, $fileOffset);
if(fgetc($this->filePointer) === false){ //Try and read from the location
throw new CorruptedRegionException("Region file location offset points to invalid location");
throw new CorruptedRegionException("Region file location offset x=$x,z=$z points to invalid file location $fileOffset");
}elseif(isset($usedOffsets[$offset])){
throw new CorruptedRegionException("Found two chunk offsets pointing to the same location");
self::getChunkCoords($usedOffsets[$offset], $existingX, $existingZ);
throw new CorruptedRegionException("Found two chunk offsets (chunk1: x=$existingX,z=$existingZ, chunk2: x=$x,z=$z) pointing to the file location $fileOffset");
}else{
$usedOffsets[$offset] = true;
$usedOffsets[$offset] = $i;
}
}