/*
 * Copyright (C) 2017 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.
 */
/*
 * Copyright (c) 2017, The Linux Foundation.
 */

/*
 * Copyright 2012 Giesecke & Devrient GmbH.
 *
 * 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.util.ArrayList;

/**
 * Response_ARAC_AID_DO
 *
 * <p>A list of AIDs containing an AID for each ARA-C.
 *
 * <p>In response to STORE DATA (Command-Get-ClientAIDs-DO), the ARA-M shall return the AID of each
 * of the ARA-Cs currently registered within a Response-ARAC-AID-DO.
 */
public class Response_ARAC_AID_DO extends BerTlv {

    public static final int TAG = 0xFF70;

    private ArrayList<AID_REF_DO> mAidDos = new ArrayList<AID_REF_DO>();

    public Response_ARAC_AID_DO(byte[] rawData, int valueIndex, int valueLength) {
        super(rawData, TAG, valueIndex, valueLength);
    }

    public ArrayList<AID_REF_DO> getAidRefDos() {
        return mAidDos;
    }

    @Override
    /**
     * Tag: FF 70
     *
     * <p>Length: n or 0 If n is equal to zero, then there are no rules to fetch.
     *
     * <p>Value: AID-REF-DO 1..n or empty AID-REF-DOs can occur several times in a concatenated DO
     * chain if several ARA-C instances exist on the SE. The value is empty if no ARA-C instance
     * exist.
     */
    public void interpret() throws ParserException {

        mAidDos.clear();

        byte[] data = getRawData();
        int index = getValueIndex();

        if (getValueLength() == 0) {
            // No Access rule available for the requested reference.
            return;
        }

        if (index + getValueLength() > data.length) {
            throw new ParserException("Not enough data for Response_ARAC_AID_DO!");
        }

        BerTlv temp;
        int currentPos = index;
        int endPos = index + getValueLength();
        do {
            temp = BerTlv.decode(data, currentPos);

            AID_REF_DO tempAidDo;

            if (temp.getTag() == AID_REF_DO.TAG
                    || temp.getTag() == AID_REF_DO.TAG_DEFAULT_APPLICATION) {
                tempAidDo =
                        new AID_REF_DO(data, temp.getTag(), temp.getValueIndex(),
                                temp.getValueLength());
                tempAidDo.interpret();
                mAidDos.add(tempAidDo);
            } else {
                // uncomment following line if a more restrictive
                // behavior is necessary.
                // throw new ParserException("Invalid DO in Response_ARAC_AID_DO!");
            }
            // get AID-REF-DOs as long as data is available.
            currentPos = temp.getValueIndex() + temp.getValueLength();
        } while (currentPos < endPos);
    }
}