garnet/lib/wlan/common/perr_destination_parser.cpp

// Copyright 2019 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include <wlan/common/perr_destination_parser.h>

namespace wlan {
namespace common {

PerrDestinationParser::PerrDestinationParser(Span<const uint8_t> bytes) : reader_(bytes) {}

std::optional<ParsedPerrDestination> PerrDestinationParser::Next() {
    ParsedPerrDestination ret = {};
    ret.header = reader_.Read<PerrPerDestinationHeader>();
    if (ret.header == nullptr) { return {}; }

    if (ret.header->flags.addr_ext()) {
        ret.ext_addr = reader_.Read<MacAddr>();
        if (ret.ext_addr == nullptr) {
            incomplete_read_ = true;
            return {};
        }
    }

    ret.tail = reader_.Read<PerrPerDestinationTail>();
    if (ret.tail == nullptr) {
        incomplete_read_ = true;
        return {};
    }

    return {ret};
}

bool PerrDestinationParser::ExtraBytesLeft() const {
    return incomplete_read_ || reader_.RemainingBytes();
}

}  // namespace common
}  // namespace wlan