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