mirror of
https://github.com/eried/portapack-mayhem.git
synced 2024-12-27 00:09:36 -05:00
88 lines
2.2 KiB
C++
88 lines
2.2 KiB
C++
/*
|
|
* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
|
|
* Copyright (C) 2017 Furrtek
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#include "ui.hpp"
|
|
#include "ui_navigation.hpp"
|
|
#include "encoders.hpp"
|
|
|
|
using namespace portapack;
|
|
|
|
namespace encoders {
|
|
|
|
size_t make_bitstream(std::string& fragments) {
|
|
uint8_t byte = 0;
|
|
size_t bitstream_length = 0;
|
|
uint8_t * bitstream = shared_memory.bb_data.data;
|
|
|
|
for (auto c : fragments) {
|
|
byte <<= 1;
|
|
if (c != '0')
|
|
byte |= 1;
|
|
|
|
if ((bitstream_length & 7) == 7)
|
|
bitstream[bitstream_length >> 3] = byte;
|
|
|
|
bitstream_length++;
|
|
}
|
|
|
|
// Finish last byte if needed
|
|
size_t padding = 8 - (bitstream_length & 7);
|
|
if (padding != 8) {
|
|
byte <<= padding;
|
|
bitstream[(bitstream_length + padding - 1) >> 3] = byte;
|
|
padding++;
|
|
}
|
|
|
|
return bitstream_length;
|
|
}
|
|
|
|
void bitstream_append(size_t& bitstream_length, uint32_t bit_count, uint32_t bits) {
|
|
uint8_t * bitstream = shared_memory.bb_data.data;
|
|
uint32_t bit_mask = 1 << (bit_count - 1);
|
|
uint32_t bit_index;
|
|
uint8_t byte = 0;
|
|
|
|
if (bitstream_length & 7)
|
|
byte = bitstream[bitstream_length >> 3];
|
|
|
|
bit_index = 7 - (bitstream_length & 7);
|
|
|
|
for (size_t i = 0; i < bit_count; i++) {
|
|
if (bits & bit_mask)
|
|
byte |= (1 << bit_index);
|
|
|
|
if (!bit_index) {
|
|
bitstream[bitstream_length >> 3] = byte;
|
|
byte = 0;
|
|
}
|
|
|
|
bit_index = (bit_index - 1) & 7;
|
|
bits <<= 1;
|
|
|
|
bitstream_length++;
|
|
}
|
|
|
|
bitstream[bitstream_length >> 3] = byte;
|
|
}
|
|
|
|
} /* namespace encoders */
|