add StatFs class from AOSP

src/api-impl/android/os/StatFs.java

@@ -0,0 +1,155 @@
+/*
+ * Copyright (C) 2007 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.
+ */
+
+package android.os;
+
+import android.system.ErrnoException;
+import android.system.Os;
+import android.system.StructStatVfs;
+
+/**
+ * Retrieve overall information about the space on a filesystem. This is a
+ * wrapper for Unix statvfs().
+ */
+public class StatFs {
+	private StructStatVfs mStat;
+
+	/**
+	 * Construct a new StatFs for looking at the stats of the filesystem at
+	 * {@code path}. Upon construction, the stat of the file system will be
+	 * performed, and the values retrieved available from the methods on this
+	 * class.
+	 *
+	 * @param path path in the desired file system to stat.
+	 *
+	 * @throws IllegalArgumentException if the file system access fails
+	 */
+	public StatFs(String path) {
+		mStat = doStat(path);
+	}
+
+	/**
+	 * @throws IllegalArgumentException if the file system access fails
+	 */
+	private static StructStatVfs doStat(String path) {
+		try {
+			return Os.statvfs(path);
+		} catch (ErrnoException e) {
+			throw new IllegalArgumentException("Invalid path: " + path, e);
+		}
+	}
+
+	/**
+	 * Perform a restat of the file system referenced by this object. This is
+	 * the same as re-constructing the object with the same file system path,
+	 * and the new stat values are available upon return.
+	 *
+	 * @throws IllegalArgumentException if the file system access fails
+	 */
+	public void restat(String path) {
+		mStat = doStat(path);
+	}
+
+	/**
+	 * @deprecated Use {@link #getBlockSizeLong()} instead.
+	 */
+	@Deprecated
+	public int getBlockSize() {
+		return (int) mStat.f_frsize;
+	}
+
+	/**
+	 * The size, in bytes, of a block on the file system. This corresponds to
+	 * the Unix {@code statvfs.f_frsize} field.
+	 */
+	public long getBlockSizeLong() {
+		return mStat.f_frsize;
+	}
+
+	/**
+	 * @deprecated Use {@link #getBlockCountLong()} instead.
+	 */
+	@Deprecated
+	public int getBlockCount() {
+		return (int) mStat.f_blocks;
+	}
+
+	/**
+	 * The total number of blocks on the file system. This corresponds to the
+	 * Unix {@code statvfs.f_blocks} field.
+	 */
+	public long getBlockCountLong() {
+		return mStat.f_blocks;
+	}
+
+	/**
+	 * @deprecated Use {@link #getFreeBlocksLong()} instead.
+	 */
+	@Deprecated
+	public int getFreeBlocks() {
+		return (int) mStat.f_bfree;
+	}
+
+	/**
+	 * The total number of blocks that are free on the file system, including
+	 * reserved blocks (that are not available to normal applications). This
+	 * corresponds to the Unix {@code statvfs.f_bfree} field. Most applications
+	 * will want to use {@link #getAvailableBlocksLong()} instead.
+	 */
+	public long getFreeBlocksLong() {
+		return mStat.f_bfree;
+	}
+
+	/**
+	 * The number of bytes that are free on the file system, including reserved
+	 * blocks (that are not available to normal applications). Most applications
+	 * will want to use {@link #getAvailableBytes()} instead.
+	 */
+	public long getFreeBytes() {
+		return mStat.f_bfree * mStat.f_frsize;
+	}
+
+	/**
+	 * @deprecated Use {@link #getAvailableBlocksLong()} instead.
+	 */
+	@Deprecated
+	public int getAvailableBlocks() {
+		return (int) mStat.f_bavail;
+	}
+
+	/**
+	 * The number of blocks that are free on the file system and available to
+	 * applications. This corresponds to the Unix {@code statvfs.f_bavail} field.
+	 */
+	public long getAvailableBlocksLong() {
+		return mStat.f_bavail;
+	}
+
+	/**
+	 * The number of bytes that are free on the file system and available to
+	 * applications.
+	 */
+	public long getAvailableBytes() {
+		return mStat.f_bavail * mStat.f_frsize;
+	}
+
+	/**
+	 * The total number of bytes supported by the file system.
+	 */
+	public long getTotalBytes() {
+		return mStat.f_blocks * mStat.f_frsize;
+	}
+}

src/api-impl/meson.build

@@ -173,6 +173,7 @@ hax_jar = jar('hax', [
               	'android/os/Process.java',
               	'android/os/RemoteException.java',
               	'android/os/ResultReceiver.java',
+              	'android/os/StatFs.java',
               	'android/os/SystemClock.java',
               	'android/os/Trace.java',
               	'android/os/UserHandle.java',