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Do not crash on failure to decompress region chunks

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this could happen when a chunk was partially overwritten with one of the same sector size.
This commit is contained in:
Dylan K. Taylor 2020-04-01 21:30:25 +01:00
parent e45e84b236
commit ec949840b2
2 changed files with 12 additions and 2 deletions
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7
src/pocketmine/level/format/io/region/Anvil.php
View File

@ -33,6 +33,7 @@ use pocketmine\nbt\tag\ByteArrayTag;
use pocketmine\nbt\tag\CompoundTag;
use pocketmine\nbt\tag\IntArrayTag;
use pocketmine\nbt\tag\ListTag;
use function zlib_decode;
class Anvil extends McRegion{
@ -96,8 +97,12 @@ class Anvil extends McRegion{
}
protected function nbtDeserialize(string $data) : Chunk{
$data = @zlib_decode($data);
if($data === false){
throw new CorruptedChunkException("Failed to decompress chunk data");
}
$nbt = new BigEndianNBTStream();
$chunk = $nbt->readCompressed($data);
$chunk = $nbt->read($data);
if(!($chunk instanceof CompoundTag) or !$chunk->hasTag("Level")){
throw new CorruptedChunkException("'Level' key is missing from chunk NBT");
}

7
src/pocketmine/level/format/io/region/McRegion.php
View File

@ -58,6 +58,7 @@ use function strrpos;
use function substr;
use function time;
use function unpack;
use function zlib_decode;
use const SCANDIR_SORT_NONE;
class McRegion extends BaseLevelProvider{
@ -125,8 +126,12 @@ class McRegion extends BaseLevelProvider{
* @throws CorruptedChunkException
*/
protected function nbtDeserialize(string $data) : Chunk{
$data = @zlib_decode($data);
if($data === false){
throw new CorruptedChunkException("Failed to decompress chunk data");
}
$nbt = new BigEndianNBTStream();
$chunk = $nbt->readCompressed($data);
$chunk = $nbt->read($data);
if(!($chunk instanceof CompoundTag) or !$chunk->hasTag("Level")){
throw new CorruptedChunkException("'Level' key is missing from chunk NBT");
}