mirror of
https://github.com/eried/portapack-mayhem.git
synced 2024-09-20 08:05:44 +00:00
033c4e9a5b
* Updated style * Updated files * fixed new line * Updated spacing * File fix WIP * Updated to clang 13 * updated comment style * Removed old comment code
65 lines
1.9 KiB
C++
65 lines
1.9 KiB
C++
/*
|
|
* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
|
|
*
|
|
* This file is part of PortaPack.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2, or (at your option)
|
|
* any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; see the file COPYING. If not, write to
|
|
* the Free Software Foundation, Inc., 51 Franklin Street,
|
|
* Boston, MA 02110-1301, USA.
|
|
*/
|
|
|
|
#ifndef __FIELD_READER_H__
|
|
#define __FIELD_READER_H__
|
|
|
|
#include <cstdint>
|
|
#include <cstddef>
|
|
|
|
struct BitRemapNone {
|
|
constexpr size_t operator()(const size_t& bit_index) const {
|
|
return bit_index;
|
|
}
|
|
};
|
|
|
|
struct BitRemapByteReverse {
|
|
constexpr size_t operator()(const size_t bit_index) const {
|
|
return bit_index ^ 7;
|
|
}
|
|
};
|
|
|
|
template <typename T, typename BitRemap>
|
|
class FieldReader {
|
|
public:
|
|
constexpr FieldReader(
|
|
const T& data)
|
|
: data{data} {
|
|
}
|
|
|
|
/* The "start_bit" winds up being the MSB of the returned field value. */
|
|
/* The BitRemap functor determines which bits are read from the source
|
|
* packet. */
|
|
int32_t read(const size_t start_bit, const size_t length) const { // Euquiq: was uint32_t, used for calculating lat / lon in radiosondes, can be negative too
|
|
uint32_t value = 0;
|
|
for (size_t i = start_bit; i < (start_bit + length); i++) {
|
|
value = (value << 1) | data[bit_remap(i)];
|
|
}
|
|
return value;
|
|
}
|
|
|
|
private:
|
|
const T& data;
|
|
const BitRemap bit_remap{};
|
|
};
|
|
|
|
#endif /*__FIELD_READER_H__*/
|