From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 From: Spottedleaf Date: Sun, 19 Dec 2021 09:13:41 -0800 Subject: [PATCH] Only write chunk data to disk if it serializes without throwing This ensures at least a valid version of the chunk exists on disk, even if outdated diff --git a/src/main/java/net/minecraft/world/level/chunk/storage/RegionFile.java b/src/main/java/net/minecraft/world/level/chunk/storage/RegionFile.java index 8ff8855c5267379b3a5f5d8baa4a275ffee2c4bf..6704ae5c2ee01f8b319f4d425fe08c16d7b1b212 100644 --- a/src/main/java/net/minecraft/world/level/chunk/storage/RegionFile.java +++ b/src/main/java/net/minecraft/world/level/chunk/storage/RegionFile.java @@ -1019,6 +1019,24 @@ public class RegionFile implements AutoCloseable { this.pos = chunkcoordintpair; } + // Paper start - don't write garbage data to disk if writing serialization fails + @Override + public void write(final int b) { + if (this.count > 500_000_000) { + throw new RegionFileStorage.RegionFileSizeException("Region file too large: " + this.count); + } + super.write(b); + } + + @Override + public void write(final byte[] b, final int off, final int len) { + if (this.count + len > 500_000_000) { + throw new RegionFileStorage.RegionFileSizeException("Region file too large: " + (this.count + len)); + } + super.write(b, off, len); + } + // Paper end + public void close() throws IOException { ByteBuffer bytebuffer = ByteBuffer.wrap(this.buf, 0, this.count); diff --git a/src/main/java/net/minecraft/world/level/chunk/storage/RegionFileStorage.java b/src/main/java/net/minecraft/world/level/chunk/storage/RegionFileStorage.java index 6986a170f37f70e8eb89d79d5d2615a06a5e0f0c..c31b9a6b1d4548d507ecb60d42ca9f96f49f6c4b 100644 --- a/src/main/java/net/minecraft/world/level/chunk/storage/RegionFileStorage.java +++ b/src/main/java/net/minecraft/world/level/chunk/storage/RegionFileStorage.java @@ -298,10 +298,17 @@ public class RegionFileStorage implements AutoCloseable { NbtIo.write(nbt, (DataOutput) dataoutputstream); regionfile.setStatus(pos.x, pos.z, ChunkSerializer.getStatus(nbt)); // Paper - cache status on disk regionfile.setOversized(pos.x, pos.z, false); // Paper - We don't do this anymore, mojang stores differently, but clear old meta flag if it exists to get rid of our own meta file once last oversized is gone + dataoutputstream.close(); // Paper - only write if successful + // Paper start - don't write garbage data to disk if writing serialization fails + } catch (RegionFileSizeException e) { + attempts = 5; // Don't retry + regionfile.clear(pos); + throw e; + // Paper end - don't write garbage data to disk if writing serialization fails } catch (Throwable throwable) { if (dataoutputstream != null) { try { - dataoutputstream.close(); + //dataoutputstream.close(); // Paper - don't write garbage data to disk if writing serialization fails } catch (Throwable throwable1) { throwable.addSuppressed(throwable1); } @@ -309,10 +316,7 @@ public class RegionFileStorage implements AutoCloseable { throw throwable; } - - if (dataoutputstream != null) { - dataoutputstream.close(); - } + // Paper - move into try block to only write if successfully serialized } // Paper start @@ -359,4 +363,13 @@ public class RegionFileStorage implements AutoCloseable { } } + + // Paper start + public static final class RegionFileSizeException extends RuntimeException { + + public RegionFileSizeException(String message) { + super(message); + } + } + // Paper end }