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/*
* Copyright (C) 2019 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 com.android.se.security.gpac;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
/**
* PERM-AR-DO: The access rule for Device API control consists of a permission bit mask of 8 bytes.
*/
public class PERM_AR_DO extends BerTlv {
public static final int TAG = 0xDB;
public static final int PERM_MASK_LEN = 8;
private byte[] mPermissionMask = new byte[0];
public PERM_AR_DO(byte[] rawData, int valueIndex, int valueLength) {
super(rawData, TAG, valueIndex, valueLength);
}
public PERM_AR_DO(byte[] permissionMask) {
super(permissionMask, TAG, 0, (permissionMask == null ? 0 : permissionMask.length));
if (permissionMask != null) mPermissionMask = permissionMask;
}
public byte[] getPermissionMask() {
return mPermissionMask;
}
@Override
/**
* Tag: DB Length: 8 Value: Contains a permission mask
*/
public void interpret() throws ParserException {
mPermissionMask = new byte[0];
byte[] data = getRawData();
int index = getValueIndex();
int length = getValueLength();
if (index + getValueLength() > data.length) {
throw new ParserException("Not enough data for PERM-AR-DO!");
}
if (length == PERM_MASK_LEN) {
mPermissionMask = new byte[length];
System.arraycopy(data, index, mPermissionMask, 0, length);
} else {
throw new ParserException("Invalid length of PERM-AR-DO!");
}
}
@Override
/**
* Tag: DB Length: 8 Value: Contains a permission mask
*/
public void build(ByteArrayOutputStream stream) throws DO_Exception {
// sanity checks
if (mPermissionMask.length != PERM_MASK_LEN) {
throw new DO_Exception("Invalid value length for PERM-AR-DO!");
}
// write tag
stream.write(getTag());
try {
stream.write(mPermissionMask.length);
stream.write(mPermissionMask);
} catch (IOException ioe) {
throw new DO_Exception("PERM could not be written!");
}
}
}
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