src/java.base/share/classes/java/util/zip/InflaterInputStream.java

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@@ -177,10 +177,14 @@
      */
     public int available() throws IOException {
         ensureOpen();
         if (reachEOF) {
             return 0;
+        } else if (inf.finished()) {
+            // the end of the compressed data stream has been reached
+            reachEOF = true;
+            return 0;
         } else {
             return 1;
         }
     }