src/java.base/share/classes/java/util/jar/JarFile.java

rev 16859 : 8176709: JarFileSystem::isMultiReleaseJar is incorrect
Reviewed-by: alanb, sherman, psandoz, mchung

*** 923,933 ****
       * Returns true if the pattern {@code src} is found in {@code b}.
       * The {@code lastOcc} array is the precomputed bad character shifts.
       * Since there are no repeated substring in our search strings,
       * the good suffix shifts can be replaced with a comparison.
       */
!     private int match(byte[] src, byte[] b, byte[] lastOcc, byte[] optoSft) {
          int len = src.length;
          int last = b.length - len;
          int i = 0;
          next:
          while (i <= last) {
--- 923,933 ----
       * Returns true if the pattern {@code src} is found in {@code b}.
       * The {@code lastOcc} array is the precomputed bad character shifts.
       * Since there are no repeated substring in our search strings,
       * the good suffix shifts can be replaced with a comparison.
       */
!     private static int match(byte[] src, byte[] b, byte[] lastOcc, byte[] optoSft) {
          int len = src.length;
          int last = b.length - len;
          int i = 0;
          next:
          while (i <= last) {
*** 970,979 ****
--- 970,981 ----
                  byte[] b = getBytes(manEntry);
                  hasClassPathAttribute = match(CLASSPATH_CHARS, b,
                          CLASSPATH_LASTOCC, CLASSPATH_OPTOSFT) != -1;
                  // is this a multi-release jar file
                  if (MULTI_RELEASE_ENABLED) {
+                     // Keep this implementation up to date with 
+                     // JarFileSystem::isMultiReleaseJar
                      int i = match(MULTIRELEASE_CHARS, b, MULTIRELEASE_LASTOCC,
                              MULTIRELEASE_OPTOSFT);
                      if (i != -1) {
                          i += MULTIRELEASE_CHARS.length;
                          if (i < b.length) {