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Merge remote-tracking branch 'origin/stable'

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Dylan K. Taylor 2021-01-20 22:16:44 +00:00
commit 69a829db91
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1 changed files with 27 additions and 24 deletions
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45
src/world/format/io/region/RegionLoader.php
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@ -25,6 +25,8 @@ namespace pocketmine\world\format\io\region;
use pocketmine\utils\AssumptionFailedError; use pocketmine\utils\AssumptionFailedError;
use pocketmine\utils\Binary; use pocketmine\utils\Binary;
use pocketmine\utils\BinaryDataException;
use pocketmine\utils\BinaryStream;
use pocketmine\world\format\ChunkException; use pocketmine\world\format\ChunkException;
use pocketmine\world\format\io\exception\CorruptedChunkException; use pocketmine\world\format\io\exception\CorruptedChunkException;
use function assert; use function assert;
@ -135,34 +137,34 @@ class RegionLoader{
fseek($this->filePointer, $this->locationTable[$index]->getFirstSector() << 12); fseek($this->filePointer, $this->locationTable[$index]->getFirstSector() << 12);
$prefix = fread($this->filePointer, 4); /*
if($prefix === false or strlen($prefix) !== 4){ * this might cause us to read some junk, but under normal circumstances it won't be any more than 4096 bytes wasted.
throw new CorruptedChunkException("Corrupted chunk header detected (unexpected end of file reading length prefix)"); * doing this in a single call is faster than making two seeks and reads to fetch the chunk.
} * this relies on the assumption that the end of the file is always padded to a multiple of 4096 bytes.
$length = Binary::readInt($prefix); */
$bytesToRead = $this->locationTable[$index]->getSectorCount() << 12;
$payload = fread($this->filePointer, $bytesToRead);
if($payload === false || strlen($payload) !== $bytesToRead){
throw new CorruptedChunkException("Corrupted chunk detected (unexpected EOF, truncated or non-padded chunk found)");
}
$stream = new BinaryStream($payload);
try{
$length = $stream->getInt();
if($length <= 0){ //TODO: if we reached here, the locationTable probably needs updating if($length <= 0){ //TODO: if we reached here, the locationTable probably needs updating
return null; return null;
} }
if($length > self::MAX_SECTOR_LENGTH){ //corrupted
throw new CorruptedChunkException("Length for chunk x=$x,z=$z ($length) is larger than maximum " . self::MAX_SECTOR_LENGTH);
}
if($length > ($this->locationTable[$index]->getSectorCount() << 12)){ //Invalid chunk, bigger than defined number of sectors $compression = $stream->getByte();
throw new CorruptedChunkException("Chunk length mismatch (expected " . ($this->locationTable[$index]->getSectorCount() << 12) . " sectors, got $length sectors)");
}
$chunkData = fread($this->filePointer, $length);
if($chunkData === false or strlen($chunkData) !== $length){
throw new CorruptedChunkException("Corrupted chunk detected (unexpected end of file reading chunk data)");
}
$compression = ord($chunkData[0]);
if($compression !== self::COMPRESSION_ZLIB and $compression !== self::COMPRESSION_GZIP){ if($compression !== self::COMPRESSION_ZLIB and $compression !== self::COMPRESSION_GZIP){
throw new CorruptedChunkException("Invalid compression type (got $compression, expected " . self::COMPRESSION_ZLIB . " or " . self::COMPRESSION_GZIP . ")"); throw new CorruptedChunkException("Invalid compression type (got $compression, expected " . self::COMPRESSION_ZLIB . " or " . self::COMPRESSION_GZIP . ")");
} }
return substr($chunkData, 1); return $stream->get($length - 1); //length prefix includes the compression byte
}catch(BinaryDataException $e){
throw new CorruptedChunkException("Corrupted chunk detected: " . $e->getMessage(), 0, $e);
}
} }
/** /**
@ -321,6 +323,8 @@ class RegionLoader{
/** @var int[] $usedOffsets */ /** @var int[] $usedOffsets */
$usedOffsets = []; $usedOffsets = [];
$fileSize = filesize($this->filePath);
if($fileSize === false) throw new AssumptionFailedError("filesize() should not return false here");
for($i = 0; $i < 1024; ++$i){ for($i = 0; $i < 1024; ++$i){
$entry = $this->locationTable[$i]; $entry = $this->locationTable[$i];
if($entry === null){ if($entry === null){
@ -333,8 +337,7 @@ class RegionLoader{
//TODO: more validity checks //TODO: more validity checks
fseek($this->filePointer, $fileOffset); if($fileOffset >= $fileSize){
if(feof($this->filePointer)){
throw new CorruptedRegionException("Region file location offset x=$x,z=$z points to invalid file location $fileOffset"); throw new CorruptedRegionException("Region file location offset x=$x,z=$z points to invalid file location $fileOffset");
} }
if(isset($usedOffsets[$offset])){ if(isset($usedOffsets[$offset])){