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46 lines
2.2 KiB
Diff
46 lines
2.2 KiB
Diff
From fc4f8bcd9f3eb50830819be0e2ea49cf808e0afe Mon Sep 17 00:00:00 2001
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From: md_5 <git@md-5.net>
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Date: Tue, 19 Feb 2019 22:30:00 +1100
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Subject: [PATCH] Allow Reading Old Large Chunks
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The size of chunks in the region format is overdetermined. In particular their size on disk is indicated by both a sector count in the header, and actual size in the body.
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If their size would overflow the header field (>= 255 sectors), it can just be read directly from the body instead.
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This code/concept was adapted from MinecraftForge.
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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
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index c62c8cbab..c78c5468c 100644
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--- a/src/main/java/net/minecraft/world/level/chunk/storage/RegionFile.java
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+++ b/src/main/java/net/minecraft/world/level/chunk/storage/RegionFile.java
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@@ -84,6 +84,14 @@ public class RegionFile implements AutoCloseable {
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if (l != 0) {
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int i1 = getSectorNumber(l);
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int j1 = getNumSectors(l);
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+ // Spigot start
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+ if (j1 == 255) {
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+ // We're maxed out, so we need to read the proper length from the section
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+ ByteBuffer realLen = ByteBuffer.allocate(4);
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+ this.file.read(realLen, i1 * 4096);
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+ j1 = (realLen.getInt(0) + 4) / 4096 + 1;
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+ }
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+ // Spigot end
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if (i1 < 2) {
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RegionFile.LOGGER.warn("Region file {} has invalid sector at index: {}; sector {} overlaps with header", new Object[]{path, k, i1});
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@@ -119,6 +127,13 @@ public class RegionFile implements AutoCloseable {
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} else {
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int j = getSectorNumber(i);
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int k = getNumSectors(i);
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+ // Spigot start
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+ if (k == 255) {
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+ ByteBuffer realLen = ByteBuffer.allocate(4);
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+ this.file.read(realLen, j * 4096);
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+ k = (realLen.getInt(0) + 4) / 4096 + 1;
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+ }
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+ // Spigot end
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int l = k * 4096;
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ByteBuffer bytebuffer = ByteBuffer.allocate(l);
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--
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2.40.1
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