Revert "Add compression ratio limiter"

Resolves #PaperMC#1792. This is safe because of #871 (this PR mitigates actual attacks this commit was trying to resolve).

This reverts commit 9890c42

Author: WouterGritter

proxy/src/main/java/com/velocitypowered/proxy/protocol/netty/MinecraftCompressDecoder.java

@@ -49,7 +49,6 @@ public class MinecraftCompressDecoder extends MessageToMessageDecoder<ByteBuf> {
           ? HARD_MAXIMUM_UNCOMPRESSED_SIZE : SERVERBOUND_MAXIMUM_UNCOMPRESSED_SIZE;
 
   private static final boolean SKIP_COMPRESSION_VALIDATION = Boolean.getBoolean("velocity.skip-uncompressed-packet-size-validation");
-  private static final double MAX_COMPRESSION_RATIO = Double.parseDouble(System.getProperty("velocity.max-compression-ratio", "64"));
 
   private final ProtocolUtils.Direction direction;
   private int threshold;
@@ -88,7 +87,6 @@ protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) t
       out.add(in.retain());
       return;
     }
-    int length = in.readableBytes();
 
     checkFrame(claimedUncompressedSize >= threshold, "Uncompressed size %s is less than"
         + " threshold %s", claimedUncompressedSize, threshold);
@@ -100,10 +98,6 @@ protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) t
       checkFrame(claimedUncompressedSize <= SERVERBOUND_UNCOMPRESSED_CAP,
               "Uncompressed size %s exceeds hard threshold of %s", claimedUncompressedSize,
               SERVERBOUND_UNCOMPRESSED_CAP);
-      double maxCompressedAllowed = length * MAX_COMPRESSION_RATIO;
-      checkFrame(claimedUncompressedSize <= maxCompressedAllowed,
-              "Uncompressed size %s exceeds ratio threshold of %s for compressed sized %s", claimedUncompressedSize,
-              maxCompressedAllowed, length);
     }
     ByteBuf compatibleIn = ensureCompatible(ctx.alloc(), compressor, in);
     ByteBuf uncompressed = preferredBuffer(ctx.alloc(), compressor, claimedUncompressedSize);