support 64 bit filesizes when calling ACE_OS::fstat() and _FILE_OFFSE…

…T_BITS==64 on Win32 systems

ACE/ace/OS_NS_sys_stat.inl

@@ -36,23 +36,29 @@ namespace ACE_OS
         ACE_OS::set_errno_to_last_error ();
         return -1;
       }
-    else if (fdata.nFileSizeHigh != 0)
+    if ((fdata.nFileSizeHigh != 0) && (sizeof (stp->st_size) < sizeof (ULONGLONG)))
       {
-        errno = EINVAL;
+        errno = EINVAL; // return an error rather than incorrect values
         return -1;
       }
-    else
-      {
-        stp->st_size = fdata.nFileSizeLow;
-        stp->st_atime = ACE_Time_Value (fdata.ftLastAccessTime).sec ();
-        stp->st_mtime = ACE_Time_Value (fdata.ftLastWriteTime).sec ();
-        stp->st_ctime = ACE_Time_Value (fdata.ftCreationTime).sec ();
-        stp->st_nlink = static_cast<short> (fdata.nNumberOfLinks);
-        stp->st_dev = stp->st_rdev = 0; // No equivalent conversion.
-        stp->st_mode = S_IXOTH | S_IROTH |
-          (fdata.dwFileAttributes & FILE_ATTRIBUTE_READONLY ? 0 : S_IWOTH) |
-          (fdata.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY ? S_IFDIR : S_IFREG);
-      }
+
+#if defined (_FILE_OFFSET_BITS) && _FILE_OFFSET_BITS == 64
+    ULARGE_INTEGER ul;
+    ul.HighPart = fdata.nFileSizeHigh;
+    ul.LowPart = fdata.nFileSizeLow;
+    stp->st_size = ul.QuadPart;
+#else
+    stp->st_size = fdata.nFileSizeLow;
+#endif /* _FILE_OFFSET_BITS */
+    stp->st_atime = ACE_Time_Value (fdata.ftLastAccessTime).sec ();
+    stp->st_mtime = ACE_Time_Value (fdata.ftLastWriteTime).sec ();
+    stp->st_ctime = ACE_Time_Value (fdata.ftCreationTime).sec ();
+    stp->st_nlink = static_cast<short> (fdata.nNumberOfLinks);
+    stp->st_dev = stp->st_rdev = 0; // No equivalent conversion.
+    stp->st_mode = S_IXOTH | S_IROTH |
+      (fdata.dwFileAttributes & FILE_ATTRIBUTE_READONLY ? 0 : S_IWOTH) |
+      (fdata.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY ? S_IFDIR : S_IFREG);
+
     return 0;
 #elif defined (ACE_LACKS_FSTAT)
     ACE_NOTSUP_RETURN (-1);