Example usage for android.nfc.tech NfcF getSystemCode

Introduction

In this page you can find the example usage for android.nfc.tech NfcF getSystemCode.

Prototype

public byte[] getSystemCode() 

Source Link

Document

Return the System Code bytes from tag discovery.

Usage

From source file:com.codebutler.farebot.card.felica.FelicaTagReader.java

@NonNull
@Override/* w  w  w .  j av a2 s. co  m*/
protected RawFelicaCard readTag(@NonNull byte[] tagId, @NonNull Tag tag, @NonNull FelicaTech tech,
        @Nullable CardKeys cardKeys) throws Exception {
    NfcF nfcF = NfcF.get(tag);
    Log.d(TAG, "Default system code: " + ByteUtils.getHexString(nfcF.getSystemCode()));

    boolean octopusMagic = false;
    boolean sztMagic = false;

    FeliCaTag ft = new FeliCaTag(tag);

    FeliCaLib.IDm idm = ft.pollingAndGetIDm(FeliCaLib.SYSTEMCODE_ANY);
    FeliCaLib.PMm pmm = ft.getPMm();

    if (idm == null) {
        throw new Exception("Failed to read IDm");
    }

    List<FelicaSystem> systems = new ArrayList<>();

    // FIXME: Enumerate "areas" inside of systems ???
    List<FeliCaLib.SystemCode> codes = Arrays.asList(ft.getSystemCodeList());

    // Check if we failed to get a System Code
    if (codes.size() == 0) {
        // Lets try to ping for an Octopus anyway
        FeliCaLib.IDm octopusSystem = ft.pollingAndGetIDm(FeliCaLib.SYSTEMCODE_OCTOPUS);
        if (octopusSystem != null) {
            Log.d(TAG, "Detected Octopus card");
            // Octopus has a special knocking sequence to allow unprotected reads, and does not
            // respond to the normal system code listing.
            codes.add(new FeliCaLib.SystemCode(FeliCaLib.SYSTEMCODE_OCTOPUS));
            octopusMagic = true;
        }

        FeliCaLib.IDm sztSystem = ft.pollingAndGetIDm(FeliCaLib.SYSTEMCODE_SZT);
        if (sztSystem != null) {
            Log.d(TAG, "Detected Shenzhen Tong card");
            // Because Octopus and SZT are similar systems, use the same knocking sequence in
            // case they have the same bugs with system code listing.
            codes.add(new FeliCaLib.SystemCode(FeliCaLib.SYSTEMCODE_SZT));
            sztMagic = true;
        }
    }

    for (FeliCaLib.SystemCode code : codes) {
        Log.d(TAG, "Got system code: " + ByteUtils.getHexString(code.getBytes()));

        int systemCode = code.getCode();

        FeliCaLib.IDm thisIdm = ft.pollingAndGetIDm(systemCode);

        Log.d(TAG, " - Got IDm: " + ByteUtils.getHexString(thisIdm.getBytes()) + "  compare: "
                + ByteUtils.getHexString(idm.getBytes()));

        byte[] foo = idm.getBytes();
        ArrayUtils.reverse(foo);
        Log.d(TAG, " - Got Card ID? " + ByteUtils.byteArrayToInt(idm.getBytes(), 2, 6) + "  "
                + ByteUtils.byteArrayToInt(foo, 2, 6));

        Log.d(TAG, " - Got PMm: " + ByteUtils.getHexString(ft.getPMm().getBytes()) + "  compare: "
                + ByteUtils.getHexString(pmm.getBytes()));

        List<FelicaService> services = new ArrayList<>();
        FeliCaLib.ServiceCode[] serviceCodes;

        if (octopusMagic && code.getCode() == FeliCaLib.SYSTEMCODE_OCTOPUS) {
            Log.d(TAG, "Stuffing in Octopus magic service code");
            serviceCodes = new FeliCaLib.ServiceCode[] { new FeliCaLib.ServiceCode(FeliCaLib.SERVICE_OCTOPUS) };
        } else if (sztMagic && code.getCode() == FeliCaLib.SYSTEMCODE_SZT) {
            Log.d(TAG, "Stuffing in SZT magic service code");
            serviceCodes = new FeliCaLib.ServiceCode[] { new FeliCaLib.ServiceCode(FeliCaLib.SERVICE_SZT) };
        } else {
            serviceCodes = ft.getServiceCodeList();
        }

        for (FeliCaLib.ServiceCode serviceCode : serviceCodes) {
            byte[] bytes = serviceCode.getBytes();
            ArrayUtils.reverse(bytes);
            int serviceCodeInt = ByteUtils.byteArrayToInt(bytes);
            serviceCode = new FeliCaLib.ServiceCode(serviceCode.getBytes());

            List<FelicaBlock> blocks = new ArrayList<>();

            ft.polling(systemCode);

            byte addr = 0;
            ReadResponse result = ft.readWithoutEncryption(serviceCode, addr);
            while (result != null && result.getStatusFlag1() == 0) {
                blocks.add(FelicaBlock.create(addr, result.getBlockData()));
                addr++;
                result = ft.readWithoutEncryption(serviceCode, addr);
            }

            if (blocks.size() > 0) { // Most service codes appear to be empty...
                services.add(FelicaService.create(serviceCodeInt, blocks));
                Log.d(TAG, "- Service code " + serviceCodeInt + " had " + blocks.size() + " blocks");
            }
        }

        systems.add(FelicaSystem.create(code.getCode(), services));
    }

    return RawFelicaCard.create(tagId, new Date(), idm, pmm, systems);
}

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