src/core/meshcop/dataset.hpp - third_party/openthread - Git at Google

 /*
  *  Copyright (c) 2016, The OpenThread Authors.
  *  All rights reserved.
  *
  *  Redistribution and use in source and binary forms, with or without
  *  modification, are permitted provided that the following conditions are met:
  *  1. Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  *  2. Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in the
  *     documentation and/or other materials provided with the distribution.
  *  3. Neither the name of the copyright holder nor the
  *     names of its contributors may be used to endorse or promote products
  *     derived from this software without specific prior written permission.
  *
  *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  *  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  *  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  *  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
  *  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  *  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  *  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  *  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  *  POSSIBILITY OF SUCH DAMAGE.
  */

 /**
  * @file
  *   This file includes definitions for managing MeshCoP Datasets.
  *
  */

 #ifndef MESHCOP_DATASET_HPP_
 #define MESHCOP_DATASET_HPP_

 #include "openthread-core-config.h"

 #include <openthread/dataset.h>

 #include "common/locator.hpp"
 #include "common/message.hpp"
 #include "common/timer.hpp"
 #include "meshcop/meshcop_tlvs.hpp"

 namespace ot {
 namespace MeshCoP {

 /**
  * This class represents MeshCop Dataset.
  *
  */
 class Dataset
 {
     friend class DatasetLocal;

 public:
     enum
     {
         kMaxSize      = OT_OPERATIONAL_DATASET_MAX_LENGTH, ///< Maximum size of MeshCoP Dataset (bytes)
         kMaxValueSize = 16,                                ///< Maximum size of each Dataset TLV value (bytes)
         kMaxGetTypes  = 64,                                ///< Maximum number of types in MGMT_GET.req
     };

     /**
      * This enumeration represents the Dataset type (active or pending).
      *
      */
     enum Type
     {
         kActive,  ///< Active Dataset
         kPending, ///< Pending Dataset
     };

     /**
      * This constructor initializes the object.
      *
      * @param[in]  aType       The type of the dataset, active or pending.
      *
      */
     explicit Dataset(Type aType);

     /**
      * This method clears the Dataset.
      *
      */
     void Clear(void);

     /**
      * This method indicates whether or not the dataset appears to be well-formed.
      *
      * @returns TRUE if the dataset appears to be well-formed, FALSE otherwise.
      *
      */
     bool IsValid(void) const;

     /**
      * This method returns a pointer to the TLV with a given type.
      *
      * @param[in] aType  A TLV type.
      *
      * @returns A pointer to the TLV or nullptr if none is found.
      *
      */
     Tlv *GetTlv(Tlv::Type aType) { return const_cast<Tlv *>(const_cast<const Dataset *>(this)->GetTlv(aType)); }

     /**
      * This method returns a pointer to the TLV with a given type.
      *
      * @param[in] aType  The TLV type.
      *
      * @returns A pointer to the TLV or nullptr if none is found.
      *
      */
     const Tlv *GetTlv(Tlv::Type aType) const;

     /**
      * This template method returns a pointer to the TLV with a given template type `TlvType`
      *
      * @returns A pointer to the TLV or nullptr if none is found.
      *
      */
     template <typename TlvType> TlvType *GetTlv(void)
     {
         return static_cast<TlvType *>(GetTlv(static_cast<Tlv::Type>(TlvType::kType)));
     }

     /**
      * This template method returns a pointer to the TLV with a given template type `TlvType`
      *
      * @returns A pointer to the TLV or nullptr if none is found.
      *
      */
     template <typename TlvType> const TlvType *GetTlv(void) const
     {
         return static_cast<const TlvType *>(GetTlv(static_cast<Tlv::Type>(TlvType::kType)));
     }

     /**
      * This method returns a pointer to the byte representation of the Dataset.
      *
      * @returns A pointer to the byte representation of the Dataset.
      *
      */
     uint8_t *GetBytes(void) { return mTlvs; }

     /**
      * This method returns a pointer to the byte representation of the Dataset.
      *
      * @returns A pointer to the byte representation of the Dataset.
      *
      */
     const uint8_t *GetBytes(void) const { return mTlvs; }

     /**
      * This method converts the TLV representation to structure representation.
      *
      * @param[out] aDataset  A reference to `otOperationalDataset` to output the Dataset.
      *
      */
     void ConvertTo(otOperationalDataset &aDataset) const;

     /**
      * This method converts the TLV representation to structure representation.
      *
      * @param[out] aDataset  A reference to `otOperationalDatasetTlvs` to output the Dataset.
      *
      */
     void ConvertTo(otOperationalDatasetTlvs &aDataset) const;

     /**
      * This method returns the Dataset size in bytes.
      *
      * @returns The Dataset size in bytes.
      *
      */
     uint16_t GetSize(void) const { return mLength; }

     /**
      * This method sets the Dataset size in bytes.
      *
      * @param[in] aSize  The Dataset size in bytes.
      *
      */
     void SetSize(uint16_t aSize) { mLength = aSize; }

     /**
      * This method returns the local time the dataset was last updated.
      *
      * @returns The local time the dataset was last updated.
      *
      */
     TimeMilli GetUpdateTime(void) const { return mUpdateTime; }

     /**
      * This method returns a reference to the Timestamp.
      *
      * @returns A pointer to the Timestamp.
      *
      */
     const Timestamp *GetTimestamp(void) const;

     /**
      * This method sets the Timestamp value.
      *
      * @param[in] aTimestamp   A Timestamp.
      *
      */
     void SetTimestamp(const Timestamp &aTimestamp);

     /**
      * This method sets a TLV in the Dataset.
      *
      * @param[in]  aTlv  A reference to the TLV.
      *
      * @retval OT_ERROR_NONE     Successfully set the TLV.
      * @retval OT_ERROR_NO_BUFS  Could not set the TLV due to insufficient buffer space.
      *
      */
     otError SetTlv(const Tlv &aTlv);

     /**
      * This method sets a TLV with a given TLV Type and Value.
      *
      * @param[in] aType     The TLV Type.
      * @param[in] aValue    A pointer to TLV Value.
      * @param[in] aLength   The TLV Length in bytes (length of @p aValue).
      *
      * @retval OT_ERROR_NONE     Successfully set the TLV.
      * @retval OT_ERROR_NO_BUFS  Could not set the TLV due to insufficient buffer space.
      *
      */
     otError SetTlv(Tlv::Type aType, const void *aValue, uint8_t aLength);

     /**
      * This method sets a TLV with a given TLV Type and a `uint16_t` Value.
      *
      * @param[in] aType     The TLV Type.
      * @param[in] aValue    The TLV value (as `uint16_t`).
      *
      * @retval OT_ERROR_NONE     Successfully set the TLV.
      * @retval OT_ERROR_NO_BUFS  Could not set the TLV due to insufficient buffer space.
      *
      */
     otError SetUint16Tlv(Tlv::Type aType, uint16_t aValue);

     /**
      * This method sets a TLV with a given TLV Type and a `uint32_t` Value.
      *
      * @param[in] aType     The TLV Type.
      * @param[in] aValue    The TLV value (as `uint32_t`).
      *
      * @retval OT_ERROR_NONE     Successfully set the TLV.
      * @retval OT_ERROR_NO_BUFS  Could not set the TLV due to insufficient buffer space.
      *
      */
     otError SetUint32Tlv(Tlv::Type aType, uint32_t aValue);

     /**
      * This method sets the Dataset using TLVs stored in a message buffer.
      *
      * @param[in]  aMessage  The message buffer.
      * @param[in]  aOffset   The message buffer offset where the dataset starts.
      * @param[in]  aLength   The TLVs length in the message buffer in bytes.
      *
      * @retval OT_ERROR_NONE          Successfully set the Dataset.
      * @retval OT_ERROR_INVALID_ARGS  The values of @p aOffset and @p aLength are not valid for @p aMessage.
      *
      */
     otError Set(const Message &aMessage, uint16_t aOffset, uint8_t aLength);

     /**
      * This method sets the Dataset using an existing Dataset.
      *
      * If this Dataset is an Active Dataset, any Pending Timestamp and Delay Timer TLVs will be omitted in the copy
      * from @p aDataset.
      *
      * @param[in]  aDataset  The input Dataset.
      *
      */
     void Set(const Dataset &aDataset);

     /**
      * This method sets the Dataset from a given structure representation.
      *
      * @param[in]  aDataset  The input Dataset as otOperationalDataset.
      *
      * @retval OT_ERROR_NONE          Successfully set the Dataset.
      * @retval OT_ERROR_INVALID_ARGS  Dataset is missing Active and/or Pending Timestamp.
      *
      */
     otError SetFrom(const otOperationalDataset &aDataset);

     /**
      * This method sets the Dataset using @p aDataset.
      *
      * @param[in]  aDataset  The input Dataset as otOperationalDatasetTlvs.
      *
      */
     void SetFrom(const otOperationalDatasetTlvs &aDataset);

     /**
      * This method removes a TLV from the Dataset.
      *
      * @param[in] aType The type of a specific TLV.
      *
      */
     void RemoveTlv(Tlv::Type aType);

     /**
      * This method appends the MLE Dataset TLV but excluding MeshCoP Sub Timestamp TLV.
      *
      * @param[in] aMessage       A message to append to.
      *
      * @retval OT_ERROR_NONE     Successfully append MLE Dataset TLV without MeshCoP Sub Timestamp TLV.
      * @retval OT_ERROR_NO_BUFS  Insufficient available buffers to append the message with MLE Dataset TLV.
      *
      */
     otError AppendMleDatasetTlv(Message &aMessage) const;

     /**
      * This method applies the Active or Pending Dataset to the Thread interface.
      *
      * @param[in]  aInstance           A reference to the OpenThread instance.
      * @param[out] aIsMasterKeyUpdated A pointer to where to place whether master key was updated.
      *
      * @retval OT_ERROR_NONE   Successfully applied configuration.
      * @retval OT_ERROR_PARSE  The dataset has at least one TLV with invalid format.
      *
      */
     otError ApplyConfiguration(Instance &aInstance, bool *aIsMasterKeyUpdated = nullptr) const;

     /**
      * This method converts a Pending Dataset to an Active Dataset.
      *
      * This method removes the Delay Timer and Pending Timestamp TLVs
      *
      */
     void ConvertToActive(void);

     /**
      * This method returns a pointer to the start of Dataset TLVs sequence.
      *
      * @return  A pointer to the start of Dataset TLVs sequence.
      *
      */
     Tlv *GetTlvsStart(void) { return reinterpret_cast<Tlv *>(mTlvs); }

     /**
      * This method returns a pointer to the start of Dataset TLVs sequence.
      *
      * @return  A pointer to start of Dataset TLVs sequence.
      *
      */
     const Tlv *GetTlvsStart(void) const { return reinterpret_cast<const Tlv *>(mTlvs); }

     /**
      * This method returns a pointer to the past-the-end of Dataset TLVs sequence.
      *
      * Note that past-the-end points to the byte after the end of the last TLV in Dataset TLVs sequence.
      *
      * @return  A pointer to past-the-end of Dataset TLVs sequence.
      *
      */
     Tlv *GetTlvsEnd(void) { return reinterpret_cast<Tlv *>(mTlvs + mLength); }

     /**
      * This method returns a pointer to the past-the-end of Dataset TLVs sequence.
      *
      * Note that past-the-end points to the byte after the end of the last TLV in Dataset TLVs sequence.
      *
      * @return  A pointer to past-the-end of Dataset TLVs sequence.
      *
      */
     const Tlv *GetTlvsEnd(void) const { return reinterpret_cast<const Tlv *>(mTlvs + mLength); }

     /**
      * This static method converts a Dataset Type to a string.
      *
      * @param[in]  aType   A Dataset type.
      *
      */
     static const char *TypeToString(Type aType);

 private:
     void RemoveTlv(Tlv *aTlv);

     uint8_t   mTlvs[kMaxSize]; ///< The Dataset buffer
     TimeMilli mUpdateTime;     ///< Local time last updated
     uint16_t  mLength;         ///< The number of valid bytes in @var mTlvs
     Type      mType;           ///< Active or Pending
 };

 } // namespace MeshCoP
 } // namespace ot

 #endif // MESHCOP_DATASET_HPP_
	/*
	* Copyright (c) 2016, The OpenThread Authors.
	* All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions are met:
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* 2. Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in the
	* documentation and/or other materials provided with the distribution.
	* 3. Neither the name of the copyright holder nor the
	* names of its contributors may be used to endorse or promote products
	* derived from this software without specific prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
	* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
	* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
	* POSSIBILITY OF SUCH DAMAGE.
	*/

	/**
	* @file
	* This file includes definitions for managing MeshCoP Datasets.
	*
	*/

	#ifndef MESHCOP_DATASET_HPP_
	#define MESHCOP_DATASET_HPP_

	#include "openthread-core-config.h"

	#include <openthread/dataset.h>

	#include "common/locator.hpp"
	#include "common/message.hpp"
	#include "common/timer.hpp"
	#include "meshcop/meshcop_tlvs.hpp"

	namespace ot {
	namespace MeshCoP {

	/**
	* This class represents MeshCop Dataset.
	*
	*/
	class Dataset
	{
	friend class DatasetLocal;

	public:
	enum
	{
	kMaxSize = OT_OPERATIONAL_DATASET_MAX_LENGTH, ///< Maximum size of MeshCoP Dataset (bytes)
	kMaxValueSize = 16, ///< Maximum size of each Dataset TLV value (bytes)
	kMaxGetTypes = 64, ///< Maximum number of types in MGMT_GET.req
	};

	/**
	* This enumeration represents the Dataset type (active or pending).
	*
	*/
	enum Type
	{
	kActive, ///< Active Dataset
	kPending, ///< Pending Dataset
	};

	/**
	* This constructor initializes the object.
	*
	* @param[in] aType The type of the dataset, active or pending.
	*
	*/
	explicit Dataset(Type aType);

	/**
	* This method clears the Dataset.
	*
	*/
	void Clear(void);

	/**
	* This method indicates whether or not the dataset appears to be well-formed.
	*
	* @returns TRUE if the dataset appears to be well-formed, FALSE otherwise.
	*
	*/
	bool IsValid(void) const;

	/**
	* This method returns a pointer to the TLV with a given type.
	*
	* @param[in] aType A TLV type.
	*
	* @returns A pointer to the TLV or nullptr if none is found.
	*
	*/
	Tlv GetTlv(Tlv::Type aType) { return const_cast<Tlv >(const_cast<const Dataset *>(this)->GetTlv(aType)); }

	/**
	* This method returns a pointer to the TLV with a given type.
	*
	* @param[in] aType The TLV type.
	*
	* @returns A pointer to the TLV or nullptr if none is found.
	*
	*/
	const Tlv *GetTlv(Tlv::Type aType) const;

	/**
	* This template method returns a pointer to the TLV with a given template type `TlvType`
	*
	* @returns A pointer to the TLV or nullptr if none is found.
	*
	*/
	template <typename TlvType> TlvType *GetTlv(void)
	{
	return static_cast<TlvType *>(GetTlv(static_cast<Tlv::Type>(TlvType::kType)));
	}

	/**
	* This template method returns a pointer to the TLV with a given template type `TlvType`
	*
	* @returns A pointer to the TLV or nullptr if none is found.
	*
	*/
	template <typename TlvType> const TlvType *GetTlv(void) const
	{
	return static_cast<const TlvType *>(GetTlv(static_cast<Tlv::Type>(TlvType::kType)));
	}

	/**
	* This method returns a pointer to the byte representation of the Dataset.
	*
	* @returns A pointer to the byte representation of the Dataset.
	*
	*/
	uint8_t *GetBytes(void) { return mTlvs; }

	/**
	* This method returns a pointer to the byte representation of the Dataset.
	*
	* @returns A pointer to the byte representation of the Dataset.
	*
	*/
	const uint8_t *GetBytes(void) const { return mTlvs; }

	/**
	* This method converts the TLV representation to structure representation.
	*
	* @param[out] aDataset A reference to `otOperationalDataset` to output the Dataset.
	*
	*/
	void ConvertTo(otOperationalDataset &aDataset) const;

	/**
	* This method converts the TLV representation to structure representation.
	*
	* @param[out] aDataset A reference to `otOperationalDatasetTlvs` to output the Dataset.
	*
	*/
	void ConvertTo(otOperationalDatasetTlvs &aDataset) const;

	/**
	* This method returns the Dataset size in bytes.
	*
	* @returns The Dataset size in bytes.
	*
	*/
	uint16_t GetSize(void) const { return mLength; }

	/**
	* This method sets the Dataset size in bytes.
	*
	* @param[in] aSize The Dataset size in bytes.
	*
	*/
	void SetSize(uint16_t aSize) { mLength = aSize; }

	/**
	* This method returns the local time the dataset was last updated.
	*
	* @returns The local time the dataset was last updated.
	*
	*/
	TimeMilli GetUpdateTime(void) const { return mUpdateTime; }

	/**
	* This method returns a reference to the Timestamp.
	*
	* @returns A pointer to the Timestamp.
	*
	*/
	const Timestamp *GetTimestamp(void) const;

	/**
	* This method sets the Timestamp value.
	*
	* @param[in] aTimestamp A Timestamp.
	*
	*/
	void SetTimestamp(const Timestamp &aTimestamp);

	/**
	* This method sets a TLV in the Dataset.
	*
	* @param[in] aTlv A reference to the TLV.
	*
	* @retval OT_ERROR_NONE Successfully set the TLV.
	* @retval OT_ERROR_NO_BUFS Could not set the TLV due to insufficient buffer space.
	*
	*/
	otError SetTlv(const Tlv &aTlv);

	/**
	* This method sets a TLV with a given TLV Type and Value.
	*
	* @param[in] aType The TLV Type.
	* @param[in] aValue A pointer to TLV Value.
	* @param[in] aLength The TLV Length in bytes (length of @p aValue).
	*
	* @retval OT_ERROR_NONE Successfully set the TLV.
	* @retval OT_ERROR_NO_BUFS Could not set the TLV due to insufficient buffer space.
	*
	*/
	otError SetTlv(Tlv::Type aType, const void *aValue, uint8_t aLength);

	/**
	* This method sets a TLV with a given TLV Type and a `uint16_t` Value.
	*
	* @param[in] aType The TLV Type.
	* @param[in] aValue The TLV value (as `uint16_t`).
	*
	* @retval OT_ERROR_NONE Successfully set the TLV.
	* @retval OT_ERROR_NO_BUFS Could not set the TLV due to insufficient buffer space.
	*
	*/
	otError SetUint16Tlv(Tlv::Type aType, uint16_t aValue);

	/**
	* This method sets a TLV with a given TLV Type and a `uint32_t` Value.
	*
	* @param[in] aType The TLV Type.
	* @param[in] aValue The TLV value (as `uint32_t`).
	*
	* @retval OT_ERROR_NONE Successfully set the TLV.
	* @retval OT_ERROR_NO_BUFS Could not set the TLV due to insufficient buffer space.
	*
	*/
	otError SetUint32Tlv(Tlv::Type aType, uint32_t aValue);

	/**
	* This method sets the Dataset using TLVs stored in a message buffer.
	*
	* @param[in] aMessage The message buffer.
	* @param[in] aOffset The message buffer offset where the dataset starts.
	* @param[in] aLength The TLVs length in the message buffer in bytes.
	*
	* @retval OT_ERROR_NONE Successfully set the Dataset.
	* @retval OT_ERROR_INVALID_ARGS The values of @p aOffset and @p aLength are not valid for @p aMessage.
	*
	*/
	otError Set(const Message &aMessage, uint16_t aOffset, uint8_t aLength);

	/**
	* This method sets the Dataset using an existing Dataset.
	*
	* If this Dataset is an Active Dataset, any Pending Timestamp and Delay Timer TLVs will be omitted in the copy
	* from @p aDataset.
	*
	* @param[in] aDataset The input Dataset.
	*
	*/
	void Set(const Dataset &aDataset);

	/**
	* This method sets the Dataset from a given structure representation.
	*
	* @param[in] aDataset The input Dataset as otOperationalDataset.
	*
	* @retval OT_ERROR_NONE Successfully set the Dataset.
	* @retval OT_ERROR_INVALID_ARGS Dataset is missing Active and/or Pending Timestamp.
	*
	*/
	otError SetFrom(const otOperationalDataset &aDataset);

	/**
	* This method sets the Dataset using @p aDataset.
	*
	* @param[in] aDataset The input Dataset as otOperationalDatasetTlvs.
	*
	*/
	void SetFrom(const otOperationalDatasetTlvs &aDataset);

	/**
	* This method removes a TLV from the Dataset.
	*
	* @param[in] aType The type of a specific TLV.
	*
	*/
	void RemoveTlv(Tlv::Type aType);

	/**
	* This method appends the MLE Dataset TLV but excluding MeshCoP Sub Timestamp TLV.
	*
	* @param[in] aMessage A message to append to.
	*
	* @retval OT_ERROR_NONE Successfully append MLE Dataset TLV without MeshCoP Sub Timestamp TLV.
	* @retval OT_ERROR_NO_BUFS Insufficient available buffers to append the message with MLE Dataset TLV.
	*
	*/
	otError AppendMleDatasetTlv(Message &aMessage) const;

	/**
	* This method applies the Active or Pending Dataset to the Thread interface.
	*
	* @param[in] aInstance A reference to the OpenThread instance.
	* @param[out] aIsMasterKeyUpdated A pointer to where to place whether master key was updated.
	*
	* @retval OT_ERROR_NONE Successfully applied configuration.
	* @retval OT_ERROR_PARSE The dataset has at least one TLV with invalid format.
	*
	*/
	otError ApplyConfiguration(Instance &aInstance, bool *aIsMasterKeyUpdated = nullptr) const;

	/**
	* This method converts a Pending Dataset to an Active Dataset.
	*
	* This method removes the Delay Timer and Pending Timestamp TLVs
	*
	*/
	void ConvertToActive(void);

	/**
	* This method returns a pointer to the start of Dataset TLVs sequence.
	*
	* @return A pointer to the start of Dataset TLVs sequence.
	*
	*/
	Tlv GetTlvsStart(void) { return reinterpret_cast<Tlv >(mTlvs); }

	/**
	* This method returns a pointer to the start of Dataset TLVs sequence.
	*
	* @return A pointer to start of Dataset TLVs sequence.
	*
	*/
	const Tlv GetTlvsStart(void) const { return reinterpret_cast<const Tlv >(mTlvs); }

	/**
	* This method returns a pointer to the past-the-end of Dataset TLVs sequence.
	*
	* Note that past-the-end points to the byte after the end of the last TLV in Dataset TLVs sequence.
	*
	* @return A pointer to past-the-end of Dataset TLVs sequence.
	*
	*/
	Tlv GetTlvsEnd(void) { return reinterpret_cast<Tlv >(mTlvs + mLength); }

	/**
	* This method returns a pointer to the past-the-end of Dataset TLVs sequence.
	*
	* Note that past-the-end points to the byte after the end of the last TLV in Dataset TLVs sequence.
	*
	* @return A pointer to past-the-end of Dataset TLVs sequence.
	*
	*/
	const Tlv GetTlvsEnd(void) const { return reinterpret_cast<const Tlv >(mTlvs + mLength); }

	/**
	* This static method converts a Dataset Type to a string.
	*
	* @param[in] aType A Dataset type.
	*
	*/
	static const char *TypeToString(Type aType);

	private:
	void RemoveTlv(Tlv *aTlv);

	uint8_t mTlvs[kMaxSize]; ///< The Dataset buffer
	TimeMilli mUpdateTime; ///< Local time last updated
	uint16_t mLength; ///< The number of valid bytes in @var mTlvs
	Type mType; ///< Active or Pending
	};

	} // namespace MeshCoP
	} // namespace ot

	#endif // MESHCOP_DATASET_HPP_