Do some minor natives housekeeping.

native/src/main/java/com/velocitypowered/natives/compression/CompressorUtils.java

@@ -26,20 +26,6 @@ class CompressorUtils {
    */
   static final int ZLIB_BUFFER_SIZE = 8192;
 
-  /**
-   * Ensures that the buffer does not go over {@code max}.
-   *
-   * @param buf the buffer for check
-   * @param max the maximum size for the buffer
-   * @throws DataFormatException if the buffer becomes too bug
-   */
-  static void ensureMaxSize(ByteBuf buf, int max) throws DataFormatException {
-    int len = buf.readableBytes();
-    if (len > max) {
-      throw new DataFormatException("Got too much data (" + len + " > " + max + ")");
-    }
-  }
-
   private CompressorUtils() {
     throw new AssertionError();
   }

native/src/main/java/com/velocitypowered/natives/util/MoreByteBufUtils.java

@@ -52,18 +52,13 @@ public class MoreByteBufUtils {
 
   private static boolean isCompatible(Native nativeStuff, ByteBuf buf) {
     BufferPreference preferred = nativeStuff.preferredBufferType();
-    switch (preferred) {
+    return switch (preferred) {
-      case DIRECT_PREFERRED:
+      case DIRECT_PREFERRED, HEAP_PREFERRED ->
-      case HEAP_PREFERRED:
         // The native prefers this type, but doesn't strictly require we provide it.
-        return true;
+        true;
-      case DIRECT_REQUIRED:
+      case DIRECT_REQUIRED -> buf.hasMemoryAddress();
-        return buf.hasMemoryAddress();
+      case HEAP_REQUIRED -> buf.hasArray();
-      case HEAP_REQUIRED:
+    };
-        return buf.hasArray();
-      default:
-        throw new AssertionError("Preferred buffer type unknown");
-    }
   }
 
   /**
@@ -77,15 +72,9 @@ public class MoreByteBufUtils {
    */
   public static ByteBuf preferredBuffer(ByteBufAllocator alloc, Native nativeStuff,
       int initialCapacity) {
-    switch (nativeStuff.preferredBufferType()) {
+    return switch (nativeStuff.preferredBufferType()) {
-      case HEAP_REQUIRED:
+      case HEAP_REQUIRED, HEAP_PREFERRED -> alloc.heapBuffer(initialCapacity);
-      case HEAP_PREFERRED:
+      case DIRECT_PREFERRED, DIRECT_REQUIRED -> alloc.directBuffer(initialCapacity);
-        return alloc.heapBuffer(initialCapacity);
+    };
-      case DIRECT_PREFERRED:
-      case DIRECT_REQUIRED:
-        return alloc.directBuffer(initialCapacity);
-      default:
-        throw new AssertionError("Preferred buffer type unknown");
-    }
   }
 }

native/src/main/java/com/velocitypowered/natives/util/NativeConstraints.java

@@ -39,8 +39,6 @@ public class NativeConstraints {
     }
 
     String osArch = System.getProperty("os.arch", "");
-    // HotSpot on Intel macOS prefers x86_64, but OpenJ9 on macOS and HotSpot/OpenJ9 elsewhere
-    // give amd64.
     IS_AMD64 = osArch.equals("amd64") || osArch.equals("x86_64");
     IS_AARCH64 = osArch.equals("aarch64") || osArch.equals("arm64");
   }