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/*
* Copyright (C) 2009 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.backup;
import android.content.Context;
import java.io.FileDescriptor;
import java.io.IOException;
/** @hide */
public class BackupDataInput {
int mBackupReader;
private EntityHeader mHeader = new EntityHeader();
private boolean mHeaderReady;
private static class EntityHeader {
String key;
int dataSize;
}
public BackupDataInput(FileDescriptor fd) {
if (fd == null) throw new NullPointerException();
mBackupReader = ctor(fd);
if (mBackupReader == 0) {
throw new RuntimeException("Native initialization failed with fd=" + fd);
}
}
protected void finalize() throws Throwable {
try {
dtor(mBackupReader);
} finally {
super.finalize();
}
}
public boolean readNextHeader() throws IOException {
int result = readNextHeader_native(mBackupReader, mHeader);
if (result == 0) {
// read successfully
mHeaderReady = true;
return true;
} else if (result > 0) {
// done
mHeaderReady = false;
return false;
} else {
// error
mHeaderReady = false;
throw new IOException("result=0x" + Integer.toHexString(result));
}
}
public String getKey() {
if (mHeaderReady) {
return mHeader.key;
} else {
throw new IllegalStateException("mHeaderReady=false");
}
}
public int getDataSize() {
if (mHeaderReady) {
return mHeader.dataSize;
} else {
throw new IllegalStateException("mHeaderReady=false");
}
}
public int readEntityData(byte[] data, int offset, int size) throws IOException {
if (mHeaderReady) {
int result = readEntityData_native(mBackupReader, data, offset, size);
if (result >= 0) {
return result;
} else {
throw new IOException("result=0x" + Integer.toHexString(result));
}
} else {
throw new IllegalStateException("mHeaderReady=false");
}
}
public void skipEntityData() throws IOException {
if (mHeaderReady) {
int result = skipEntityData_native(mBackupReader);
if (result >= 0) {
return;
} else {
throw new IOException("result=0x" + Integer.toHexString(result));
}
} else {
throw new IllegalStateException("mHeaderReady=false");
}
}
private native static int ctor(FileDescriptor fd);
private native static void dtor(int mBackupReader);
private native int readNextHeader_native(int mBackupReader, EntityHeader entity);
private native int readEntityData_native(int mBackupReader, byte[] data, int offset, int size);
private native int skipEntityData_native(int mBackupReader);
}
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