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/*
* Copyright (C) 2016 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.server.wifi.hotspot2.anqp;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
/**
* Utility class for formatting IEI (Information Element Identity) data for testing.
*/
public class CellularNetworkTestUtil {
/**
* Format and return PLMN List IEI with the given PLMN list data.
*
* @param plmnList The array of PLMN data
* @return byte[]
* @throws IOException
*/
public static byte[] formatPLMNListIEI(byte[][] plmnList) throws IOException {
return formatPLMNListIEI(CellularNetwork.IEI_TYPE_PLMN_LIST, plmnList);
}
/**
* Format and return PLMN List IEI with the given IEI type and PLMN list data. This
* allows the test to use an invalid IEI type for testing purpose.
*
* @param ieiType The IEI type
* @param plmnList The array of PLMN data
* @return byte[]
* @throws IOException
*/
public static byte[] formatPLMNListIEI(int ieiType, byte[][] plmnList) throws IOException {
return formatPLMNListIEI(ieiType, plmnList, false);
}
/**
* Format and return PLMN List IEI with the given IEI type and PLMN list data. This also
* allows the test to intentionally setting an incorrect size value.
*
* @param ieiType The IEI type
* @param plmnList The array of PLMN data
* @param setWrongSize Flag for setting incorrect IEI size
* @return byte[]
* @throws IOException
*/
public static byte[] formatPLMNListIEI(int ieiType, byte[][] plmnList, boolean setWrongSize)
throws IOException {
ByteArrayOutputStream stream = new ByteArrayOutputStream();
// Calculate the total bytes for all the PLMNs.
int plmnsSize = getDataSize(plmnList);
// Use incorrect size intentionally.
if (setWrongSize) plmnsSize -= 1;
stream.write((byte) ieiType);
// One extra byte for the PLMN count field.
stream.write((byte) ((plmnsSize + 1) & CellularNetwork.IEI_CONTENT_LENGTH_MASK));
stream.write((byte) plmnList.length);
for (byte[] plmn : plmnList) {
stream.write(plmn);
}
return stream.toByteArray();
}
/**
* Return the number of bytes in a 2D array.
*
* @param dataArray The 2D array
* @return The number of bytes in the 2D array
*/
public static int getDataSize(byte[][] dataArray) {
int size = 0;
for (byte[] data : dataArray) {
size += data.length;
}
return size;
}
}
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