HDFS-16466. Implement Linux permission flags on Windows (#4526)

* HDFS-16466. Implement Linux permission flags on Windows

* statinfo.cc uses POSIX permission flags.
  These flags aren't available for Windows.
* This PR implements the equivalent flags
  on Windows to make this cross platform
  compatible.

hadoop-hdfs-project/hadoop-hdfs-native-client/src/main/native/libhdfspp/lib/common/statinfo.cc

@@ -17,10 +17,12 @@
  */
 
 #include <hdfspp/statinfo.h>
-#include <sys/stat.h>
+
 #include <sstream>
 #include <iomanip>
 
+#include "x-platform/stat.h"
+
 namespace hdfs {
 
 StatInfo::StatInfo()

hadoop-hdfs-project/hadoop-hdfs-native-client/src/main/native/libhdfspp/lib/x-platform/stat.h

@@ -0,0 +1,42 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef NATIVE_LIBHDFSPP_LIB_CROSS_PLATFORM_STAT
+#define NATIVE_LIBHDFSPP_LIB_CROSS_PLATFORM_STAT
+
+#include <sys/stat.h>
+
+#if defined(_WIN32)
+
+// Windows defines the macros for user RWX (_S_IREAD, _S_IWRITE and _S_IEXEC),
+// but not for group and others. We implement the permissions for group and
+// others through appropriate bit shifting.
+
+#define S_IRUSR _S_IREAD
+#define S_IWUSR _S_IWRITE
+#define S_IXUSR _S_IEXEC
+#define S_IRGRP (S_IRUSR >> 3)
+#define S_IWGRP (S_IWUSR >> 3)
+#define S_IXGRP (S_IXUSR >> 3)
+#define S_IROTH (S_IRGRP >> 3)
+#define S_IWOTH (S_IWGRP >> 3)
+#define S_IXOTH (S_IXGRP >> 3)
+
+#endif
+
+#endif