portapack-mayhem/firmware/common/field_reader.hpp

51 lines
1.3 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>
template<typename T, typename BitRemap>
class FieldReader {
public:
constexpr FieldReader(
const T& data
) : data { data }
{
}
uint32_t read(const size_t start_bit, const size_t length) const {
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__*/