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package com.android.server.wifi.anqp;
import java.net.ProtocolException;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import static com.android.server.wifi.anqp.Constants.BYTE_MASK;
public class CellularNetwork implements Iterable<String> {
private static final int PLMNListType = 0;
private final List<String> mMccMnc;
private CellularNetwork(int plmnCount, ByteBuffer payload) throws ProtocolException {
mMccMnc = new ArrayList<>(plmnCount);
while (plmnCount > 0) {
if (payload.remaining() < 3) {
throw new ProtocolException("Truncated PLMN info");
}
byte[] plmn = new byte[3];
payload.get(plmn);
int mcc = ((plmn[0] << 8) & 0xf00) |
(plmn[0] & 0x0f0) |
(plmn[1] & 0x00f);
int mnc = ((plmn[2] << 4) & 0xf0) |
((plmn[2] >> 4) & 0x0f);
int n2 = (plmn[1] >> 4) & 0x0f;
String mccMnc = n2 != 0xf ?
String.format("%03x%03x", mcc, (mnc << 4) | n2) :
String.format("%03x%02x", mcc, mnc);
mMccMnc.add(mccMnc);
plmnCount--;
}
}
public static CellularNetwork buildCellularNetwork(ByteBuffer payload)
throws ProtocolException {
int iei = payload.get() & BYTE_MASK;
int plmnLen = payload.get() & 0x7f;
if (iei != PLMNListType) {
payload.position(payload.position() + plmnLen);
return null;
}
int plmnCount = payload.get() & BYTE_MASK;
return new CellularNetwork(plmnCount, payload);
}
@Override
public Iterator<String> iterator() {
return mMccMnc.iterator();
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder("PLMN:");
for (String mccMnc : mMccMnc) {
sb.append(' ').append(mccMnc);
}
return sb.toString();
}
}
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