upload android base code part1

android/frameworks/native/libs/diskusage/Android.bp

@@ -0,0 +1,18 @@
+// Copyright (C) 2010 The Android Open Source Project
+//
+// Licensed 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.
+
+cc_library_static {
+    name: "libdiskusage",
+    srcs: ["dirsize.c"],
+}

android/frameworks/native/libs/diskusage/dirsize.c

@@ -0,0 +1,71 @@
+/*
+ *
+ * Copyright (C) 2008, The Android Open Source Project
+ *
+ * Licensed 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.
+ */
+
+#include <dirent.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#include <diskusage/dirsize.h>
+
+int64_t stat_size(struct stat *s)
+{
+    return s->st_blocks * 512;
+}
+
+int64_t calculate_dir_size(int dfd)
+{
+    int64_t size = 0;
+    struct stat s;
+    DIR *d;
+    struct dirent *de;
+
+    d = fdopendir(dfd);
+    if (d == NULL) {
+        close(dfd);
+        return 0;
+    }
+
+    while ((de = readdir(d))) {
+        const char *name = de->d_name;
+        if (de->d_type == DT_DIR) {
+            int subfd;
+
+            /* always skip "." and ".." */
+            if (name[0] == '.') {
+                if (name[1] == 0)
+                    continue;
+                if ((name[1] == '.') && (name[2] == 0))
+                    continue;
+            }
+
+            if (fstatat(dfd, name, &s, AT_SYMLINK_NOFOLLOW) == 0) {
+                size += stat_size(&s);
+            }
+            subfd = openat(dfd, name, O_RDONLY | O_DIRECTORY);
+            if (subfd >= 0) {
+                size += calculate_dir_size(subfd);
+            }
+        } else {
+            if (fstatat(dfd, name, &s, AT_SYMLINK_NOFOLLOW) == 0) {
+                size += stat_size(&s);
+            }
+        }
+    }
+    closedir(d);
+    return size;
+}