mirror of https://github.com/ARMmbed/mbed-os.git
123 lines
2.6 KiB
C++
123 lines
2.6 KiB
C++
/* mbed Microcontroller Library
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* Copyright (c) 2006-2013 ARM Limited
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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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#ifndef BLE_GAP_ADVERTISINGDATAPARSER_H
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#define BLE_GAP_ADVERTISINGDATAPARSER_H
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#include <stdint.h>
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#include "ble/gap/AdvertisingDataTypes.h"
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#include "platform/Span.h"
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namespace ble {
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/**
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* @addtogroup ble
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* @{
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* @addtogroup gap
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* @{
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*/
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/**
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* Parse and iterate over advertising data
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*/
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class AdvertisingDataParser {
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enum {
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DATA_SIZE_INDEX = 0,
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TYPE_INDEX = 1,
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VALUE_INDEX = 2,
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TYPE_SIZE = 1,
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DATA_SIZE_SIZE = 1
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};
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public:
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/**
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* Representation of an Advertising Data element.
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*/
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struct element_t {
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adv_data_type_t type;
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mbed::Span<const uint8_t> value;
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};
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/**
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* Build a parser from an array of bytes.
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* @param data The data to parse.
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*/
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AdvertisingDataParser(mbed::Span<const uint8_t> data) :
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data(data),
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position(0)
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{
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}
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/**
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* Return if there is advertising data element left to parse.
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*/
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bool hasNext() const
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{
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if (position >= data.size()) {
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return false;
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}
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if (position + current_length() >= data.size()) {
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return false;
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}
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return true;
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}
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/**
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* Return the next advertising data element.
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*
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* @note Calling this function if there is no next element is undefined
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* behavior.
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*/
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element_t next()
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{
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element_t element = {
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(ble::adv_data_type_t::type) data[position + TYPE_INDEX],
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data.subspan(position + VALUE_INDEX, current_length() - (TYPE_SIZE))
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};
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position += (DATA_SIZE_SIZE + current_length());
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return element;
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}
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/**
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* Reset the parser.
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*/
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void reset()
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{
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position = 0;
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}
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private:
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uint8_t current_length() const {
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return data[position + DATA_SIZE_INDEX];
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}
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mbed::Span<const uint8_t> data;
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size_t position;
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};
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/**
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* @}
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* @}
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*/
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} // namespace ble
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#endif //BLE_GAP_ADVERTISINGDATAPARSER_H
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