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LevelDB: workaround 0 bpb palettes with a length prefix

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this was caused by a plugin overriding the world provider.

related:
-  https://github.com/pmmp/PocketMine-MP/issues/5911
-  https://github.com/Refaltor77/CustomItemAPI/issues/68

fixes #5911
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Dylan K. Taylor 2023-07-19 15:19:33 +01:00
parent 763241b11f
commit 6c59912ed5
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GPG Key ID: 8927471A91CAFD3D
1 changed files with 30 additions and 1 deletions
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31
src/world/format/io/leveldb/LevelDB.php
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@ -27,6 +27,7 @@ use pocketmine\block\Block;
use pocketmine\data\bedrock\BiomeIds; use pocketmine\data\bedrock\BiomeIds;
use pocketmine\data\bedrock\block\BlockStateDeserializeException; use pocketmine\data\bedrock\block\BlockStateDeserializeException;
use pocketmine\nbt\LittleEndianNbtSerializer; use pocketmine\nbt\LittleEndianNbtSerializer;
use pocketmine\nbt\NBT;
use pocketmine\nbt\NbtDataException; use pocketmine\nbt\NbtDataException;
use pocketmine\nbt\tag\CompoundTag; use pocketmine\nbt\tag\CompoundTag;
use pocketmine\nbt\TreeRoot; use pocketmine\nbt\TreeRoot;
@ -155,7 +156,35 @@ class LevelDB extends BaseWorldProvider implements WritableWorldProvider{
$nbt = new LittleEndianNbtSerializer(); $nbt = new LittleEndianNbtSerializer();
$palette = []; $palette = [];
$paletteSize = $bitsPerBlock === 0 ? 1 : $stream->getLInt(); if($bitsPerBlock === 0){
$paletteSize = 1;
/*
* Due to code copy-paste in a public plugin, some PM4 worlds have 0 bpb palettes with a length prefix.
* This is invalid and does not happen in vanilla.
* These palettes were accepted by PM4 despite being invalid, but PM5 considered them corrupt, causing loss
* of data. Since many users were affected by this, a workaround is therefore necessary to allow PM5 to read
* these worlds without data loss.
*
* References:
* - https://github.com/Refaltor77/CustomItemAPI/issues/68
* - https://github.com/pmmp/PocketMine-MP/issues/5911
*/
$offset = $stream->getOffset();
$byte1 = $stream->getByte();
$stream->setOffset($offset); //reset offset
if($byte1 !== NBT::TAG_Compound){ //normally the first byte would be the NBT of the blockstate
$susLength = $stream->getLInt();
if($susLength !== 1){ //make sure the data isn't complete garbage
throw new CorruptedChunkException("CustomItemAPI borked 0 bpb palette should always have a length of 1");
}
$logger->error("Unexpected palette size for 0 bpb palette");
}else{
$logger->debug("Normal 0 bpb palette found :)");
}
}else{
$paletteSize = $stream->getLInt();
}
for($i = 0; $i < $paletteSize; ++$i){ for($i = 0; $i < $paletteSize; ++$i){
try{ try{