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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/apdu/apdu_response.h"
#include <utility>
#include "base/numerics/safe_conversions.h"
namespace apdu {
// static
std::optional<ApduResponse> ApduResponse::CreateFromMessage(
base::span<const uint8_t> data) {
// Invalid message size, data is appended by status byte.
if (data.size() < 2) {
return std::nullopt;
}
uint16_t status_bytes = data[data.size() - 2] << 8;
status_bytes |= data[data.size() - 1];
return ApduResponse(std::vector<uint8_t>(data.begin(), data.end() - 2),
static_cast<Status>(status_bytes));
}
ApduResponse::ApduResponse(std::vector<uint8_t> data, Status response_status)
: data_(std::move(data)), response_status_(response_status) {}
ApduResponse::ApduResponse(ApduResponse&& that) = default;
ApduResponse& ApduResponse::operator=(ApduResponse&& that) = default;
ApduResponse::~ApduResponse() = default;
std::vector<uint8_t> ApduResponse::GetEncodedResponse() const {
std::vector<uint8_t> encoded_response = data_;
encoded_response.push_back(
base::strict_cast<uint16_t>(response_status_) >> 8 & 0xff);
encoded_response.push_back(base::strict_cast<uint16_t>(response_status_) &
0xff);
return encoded_response;
}
} // namespace apdu
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