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Address some issues with book limits (#1798)

Browse source 
The multibyte calculation has been fixed, now we actually work out which
characters take more than a byte.

Diminishing returns has been modified, previously the multiplier would zero
itself out due to floating point limitations
This commit is contained in:
Shane Freeder 2019-01-12 13:59:06 +00:00
parent f51229fdce
commit 0e7c9559ec
2 changed files with 26 additions and 13 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

37
Spigot-Server-Patches/Book-Size-Limits.patch
View file

@ -22,9 +22,18 @@ index fef899ae0..468aff713 100644
+ }
}
diff --git a/src/main/java/net/minecraft/server/PlayerConnection.java b/src/main/java/net/minecraft/server/PlayerConnection.java
index 7ae374085..bbdf729c3 100644
index cb6d1deb8..8d06b23ea 100644
--- a/src/main/java/net/minecraft/server/PlayerConnection.java
+++ b/src/main/java/net/minecraft/server/PlayerConnection.java
@@ -0,0 +0,0 @@ import java.util.Collections;
import java.util.Iterator;
import java.util.Set;
import javax.annotation.Nullable;
+
+import org.apache.commons.lang3.StringEscapeUtils;
import org.apache.commons.lang3.StringUtils;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
@@ -0,0 +0,0 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
}
@ -41,24 +50,28 @@ index 7ae374085..bbdf729c3 100644
+ String testString = pageList.getString(i);
+ int byteLength = testString.getBytes(java.nio.charset.StandardCharsets.UTF_8).length;
+ byteTotal += byteLength;
+ if (byteTotal > byteAllowed) {
+ PlayerConnection.LOGGER.warn(this.player.getName() + " tried to send too large of a book. Book Size: " + byteTotal + " - Allowed: "+ byteAllowed + " - Pages: " + pageList.size());
+ minecraftServer.postToMainThread(() -> this.disconnect("Book too large!"));
+ return;
+ }
+ int length = testString.length();
+ int multibytes = byteLength == length ? byteLength : (int) Math.round((double) byteLength / (double) length);
+ for (int x = 1; x < multibytes; x++) {
+ multiplier *= multiplier;
+ int multibytes = 0;
+ if (byteLength != length) {
+ for (char c : testString.toCharArray()) {
+ if (c > 127) {
+ multibytes++;
+ }
+ }
+ }
+ byteAllowed += (maxBookPageSize * Math.min(1, Math.max(0.1D, (double) length / 255D))) * multiplier;
+ multiplier *= multiplier;
+
+ if (multibytes > 1) {
+ // penalize MB some more
+ byteAllowed -= length;
+ // penalize MB
+ byteAllowed -= multibytes;
+ }
+ }
+
+ if (byteTotal > byteAllowed) {
+ PlayerConnection.LOGGER.warn(this.player.getName() + " tried to send too large of a book. Book Size: " + byteTotal + " - Allowed: "+ byteAllowed + " - Pages: " + pageList.size());
+ minecraftServer.postToMainThread(() -> this.disconnect("Book too large!"));
+ return;
+ }
+ }
+ // Paper end
// CraftBukkit start

2
Spigot-Server-Patches/Fix-PlayerEditBookEvent.patch
View file

@ -10,7 +10,7 @@ it impossible to properly cancel the event or modify the book meta
cancelled writing
diff --git a/src/main/java/net/minecraft/server/PlayerConnection.java b/src/main/java/net/minecraft/server/PlayerConnection.java
index 74c570615..9741d3b23 100644
index 8d06b23ea..a8a6e236e 100644
--- a/src/main/java/net/minecraft/server/PlayerConnection.java
+++ b/src/main/java/net/minecraft/server/PlayerConnection.java
@@ -0,0 +0,0 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {