src/java.base/windows/native/libjava/WinNTFileSystem_md.c

*** 1,7 ****
  /*
!  * Copyright (c) 2001, 2015, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
--- 1,7 ----
  /*
!  * Copyright (c) 2001, 2016, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
*** 885,889 ****
--- 885,928 ----
      }
  
      free(pathbuf);
      return rv;
  }
+ 
+ // pathname is expected to be either null or to contain the root
+ // of the path terminated by a backslash
+ JNIEXPORT jlong JNICALL
+ Java_java_io_WinNTFileSystem_getNameMax0(JNIEnv *env, jobject this,
+                                          jstring pathname)
+ {
+     BOOL res = 0;
+     DWORD maxComponentLength;
+ 
+     if (pathname == NULL) {
+             res = GetVolumeInformationW(NULL,
+                                         NULL,
+                                         0,
+                                         NULL,
+                                         &maxComponentLength,
+                                         NULL,
+                                         NULL,
+                                         0);
+     } else {
+         WITH_UNICODE_STRING(env, pathname, path) {
+             res = GetVolumeInformationW(path,
+                                         NULL,
+                                         0,
+                                         NULL,
+                                         &maxComponentLength,
+                                         NULL,
+                                         NULL,
+                                         0);
+         } END_UNICODE_STRING(env, path);
+     }
+ 
+     if (res == 0) {
+         JNU_ThrowIOExceptionWithLastError(env,
+             "Could not get maximum compnent length");
+     }
+ 
+     return (jlong)maxComponentLength;
+ }