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/*
* Copyright (C) 2019, 2020 "IoT.bzh"
* Author "Arthur Guyader" <arthur.guyader@iot.bzh>
*
* 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.
*/
#include "converter.hpp"
#include <sstream>
#include <net/if.h>
#include <afb/afb-binding>
/**
* @brief Convert hex data to string
*
* @param data An array of data
* @param length The length of the data
* @return std::string The string data
*/
std::string converter_t::to_hex(const uint8_t data[], const size_t length)
{
std::stringstream stream;
stream << std::hex << std::setfill('0');
for(int i = 0; i < length; i++)
stream << std::hex << ((int) data[i]);
return stream.str();
}
/**
* @brief Translate bit_position and bit_size
*
*
* @param bit_position The position in the frame
* @param bit_size The size of the signal
* @param new_start_byte The first bytes of the signal in the frame
* @param new_end_byte The last byte of the signal in the frame
* @param new_start_bit The first bit of the signal in the frame
* @param new_end_bit The last bit of the signal in the frame
*/
void converter_t::signal_to_bits_bytes(unsigned int bit_position, unsigned int bit_size, int &new_start_byte, int &new_end_byte, uint8_t &new_start_bit, uint8_t &new_end_bit)
{
new_start_byte = bit_position >> 3;
new_start_bit = bit_position % 8;
new_end_byte = (bit_position + bit_size - 1) >> 3;
new_end_bit = (bit_position + bit_size - 1) % 8;
}
/**
* @brief This is to use when you have a big endian CAN frame layout.
* It converts the bit position so it matches with little endiant CAN frame layout.
*
* @param bit_position Original bit position.
* @param bit_size Size of the data.
* @return uint32_t New little endian bit position.
*/
uint32_t converter_t::bit_position_swap(uint32_t bit_position,uint32_t bit_size)
{
uint32_t start_byte_position = (uint32_t)(bit_position/8);
uint32_t bit_size_rest = bit_size;
if((int)(bit_size-(8 + start_byte_position*8-bit_position%8))>0)
{
AFB_ERROR("Error: bit_position and bit_size getting out of range");
return bit_position;
}
if(bit_size<=8 && ((bit_position+bit_size)%8==bit_size || (bit_position+bit_size)%8==0))
{
return (uint32_t)(start_byte_position*8 + (8-bit_size));
}
else
{
do
{
bit_size_rest = bit_size_rest - ((start_byte_position+1)*8-bit_position);
start_byte_position--;
bit_position = start_byte_position*8;
} while (bit_size_rest>8);
return (uint32_t)(start_byte_position*8 + (8-bit_size_rest));
}
}
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