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/*
* Copyright (C) 2014 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.service.persistentdata;
import android.annotation.SystemApi;
import android.os.RemoteException;
import android.util.Slog;
/**
* Interface for reading and writing data blocks to a persistent partition.
*
* Allows writing one block at a time. Namely, each time
* {@link PersistentDataBlockManager#write(byte[])}
* is called, it will overwite the data that was previously written on the block.
*
* Clients can query the size of the currently written block via
* {@link PersistentDataBlockManager#getDataBlockSize()}.
*
* Clients can query the maximum size for a block via
* {@link PersistentDataBlockManager#getMaximumDataBlockSize()}
*
* Clients can read the currently written block by invoking
* {@link PersistentDataBlockManager#read()}.
*
* @hide
*/
@SystemApi
public class PersistentDataBlockManager {
private static final String TAG = PersistentDataBlockManager.class.getSimpleName();
private IPersistentDataBlockService sService;
public PersistentDataBlockManager(IPersistentDataBlockService service) {
sService = service;
}
/**
* Writes {@code data} to the persistent partition. Previously written data
* will be overwritten. This data will persist across factory resets.
*
* Returns the number of bytes written or -1 on error. If the block is too big
* to fit on the partition, returns -MAX_BLOCK_SIZE.
*
* @param data the data to write
*/
public int write(byte[] data) {
try {
return sService.write(data);
} catch (RemoteException e) {
onError("writing data");
return -1;
}
}
/**
* Returns the data block stored on the persistent partition.
*/
public byte[] read() {
try {
return sService.read();
} catch (RemoteException e) {
onError("reading data");
return null;
}
}
/**
* Retrieves the size of the block currently written to the persistent partition.
*
* Return -1 on error.
*/
public int getDataBlockSize() {
try {
return sService.getDataBlockSize();
} catch (RemoteException e) {
onError("getting data block size");
return -1;
}
}
/**
* Retrieves the maximum size allowed for a data block.
*
* Returns -1 on error.
*/
public long getMaximumDataBlockSize() {
try {
return sService.getMaximumDataBlockSize();
} catch (RemoteException e) {
onError("getting maximum data block size");
return -1;
}
}
/**
* Zeroes the previously written block in its entirety. Calling this method
* will erase all data written to the persistent data partition.
*/
public void wipe() {
try {
sService.wipe();
} catch (RemoteException e) {
onError("wiping persistent partition");
}
}
/**
* Writes a byte enabling or disabling the ability to "OEM unlock" the device.
*/
public void setOemUnlockEnabled(boolean enabled) {
try {
sService.setOemUnlockEnabled(enabled);
} catch (RemoteException e) {
onError("setting OEM unlock enabled to " + enabled);
}
}
/**
* Returns whether or not "OEM unlock" is enabled or disabled on this device.
*/
public boolean getOemUnlockEnabled() {
try {
return sService.getOemUnlockEnabled();
} catch (RemoteException e) {
onError("getting OEM unlock enabled bit");
return false;
}
}
private void onError(String msg) {
Slog.v(TAG, "Remote exception while " + msg);
}
}
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