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/*
* Copyright 2018 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <array>
#include <variant>
#include "bluetooth/uuid.h"
#include "packet.h"
#include "sdp_common.h"
#include "stack/include/bt_types.h"
namespace bluetooth {
namespace sdp {
// A helper class that helps extract data element objects from SDP packets.
class DataElementReader {
public:
// If the DataElement contains monostate, that means parsing has failed.
using DataElement =
std::variant<std::monostate, bool, int8_t, int16_t, int32_t, int64_t,
uint8_t, uint16_t, uint32_t, uint64_t, Octet16, Uuid,
std::string, DataElementReader>;
DataElementReader(Iterator begin, Iterator end) : it_(begin), end_(end){};
// Get the next Data Element in the data. If reading fails for any reason,
// the DataElementReader becomes invalid and will continuously fail to read
// from that point onward.
DataElement ReadNext();
private:
// Extraction Helpers
DataElement ParseFail();
template <class IntegerType>
DataElement ReadInteger();
DataElement ReadLargeInt();
// Extraction Functions
DataElement ReadSignedInt(DataElementSize size);
DataElement ReadUnsignedInt(DataElementSize size);
DataElement ReadUuid(DataElementSize size);
DataElement ReadString(DataElementSize size);
DataElement ReadSequence(DataElementSize size);
Iterator it_;
Iterator end_;
};
} // namespace sdp
} // namespace bluetooth
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