code: void doneWithMeta()
      {
          parsingMeta = false;
          anyToVerify = !sigFileSigners.isEmpty();
          baos = null;
          sigFileData = null;
          pendingBlocks = null;
          signerCache = null;
          manDig = null;
          // MANIFEST.MF is always treated as signed and verified,
          // move its signers from sigFileSigners to verifiedSigners.
          if (sigFileSigners.containsKey(JarFile.MANIFEST_NAME)) {
              verifiedSigners.put(JarFile.MANIFEST_NAME,
                      sigFileSigners.remove(JarFile.MANIFEST_NAME));
          }
      }
docs: called to let us know we have processed all the
  META-INF entries, and if we re-read one of them, don't
  re-process it. Also gets rid of any data structures
  we needed when parsing META-INF entries.