optimise ByteStringInputStream.scala

Update ByteStringInputStream.scala

http-core/src/main/scala/org/apache/pekko/http/impl/engine/http2/hpack/ByteStringInputStream.scala

@@ -33,19 +33,23 @@ private[http2] object ByteStringInputStream {
     lookup.findVirtual(classOf[ByteString], "asInputStream", inputStreamMethodType)
   }.toOption
 
-  def apply(bs: ByteString): InputStream =
-    byteStringInputStreamMethodTypeOpt.map { mh =>
-      mh.invoke(bs).asInstanceOf[InputStream]
-    }.getOrElse {
-      legacyConvert(bs)
-    }
-
-  private def legacyConvert(bs: ByteString): InputStream =
-    bs match {
-      case cs: ByteString1C =>
-        new ByteArrayInputStream(cs.toArrayUnsafe())
-      case _ =>
-        // NOTE: We actually measured recently, and compact + use array was pretty good usually
-        apply(bs.compact)
+  def apply(bs: ByteString): InputStream = bs match {
+    case cs: ByteString1C =>
+      new ByteArrayInputStream(cs.toArrayUnsafe())
+    case _ => {
+      byteStringInputStreamMethodTypeOpt.map { mh =>
+        mh.invoke(byteString).asInstanceOf[InputStream]
+      }.getOrElse {
+        legacyConvert(bs)
+      }
     }
+  }
+
+  private def legacyConvert(bs: ByteString): InputStream = bs match {
+    case cs: ByteString1C =>
+      new ByteArrayInputStream(cs.toArrayUnsafe())
+    case _ =>
+      // NOTE: We actually measured recently, and compact + use array was pretty good usually
+      legacyConvert(bs.compact)
+  }
 }