Source/WebCore/Modules/webauthn/apdu/ApduResponse.cpp

// Copyright 2017 The Chromium Authors. All rights reserved.
// Copyright (C) 2018 Apple Inc. All rights reserved.
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#include "config.h"
#include "ApduResponse.h"

#include <wtf/Optional.h>

#if ENABLE(WEB_AUTHN)

namespace apdu {

// static
Optional<ApduResponse> ApduResponse::createFromMessage(const Vector<uint8_t>& data)
{
    // Invalid message size, data is appended by status byte.
    if (data.size() < 2)
        return WTF::nullopt;

    uint16_t statusBytes = data[data.size() - 2] << 8;
    statusBytes |= data[data.size() - 1];

    Vector<uint8_t> newData;
    newData.appendRange(data.begin(), data.end() - 2);
    return ApduResponse(WTFMove(newData), static_cast<Status>(statusBytes));
}

ApduResponse::ApduResponse(Vector<uint8_t>&& data, Status responseStatus)
    : m_data(WTFMove(data))
    , m_responseStatus(responseStatus)
{
}

Vector<uint8_t> ApduResponse::getEncodedResponse() const
{
    Vector<uint8_t> encodedResponse = m_data;
    encodedResponse.append(static_cast<uint16_t>(m_responseStatus) >> 8 & 0xff);
    encodedResponse.append(static_cast<uint16_t>(m_responseStatus) & 0xff);
    return encodedResponse;
}

} // namespace apdu

#endif // ENABLE(WEB_AUTHN)