mirror of
https://github.com/portapack-mayhem/mayhem-firmware.git
synced 2024-12-23 16:37:43 +00:00
88 lines
2.2 KiB
C++
88 lines
2.2 KiB
C++
/*
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* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
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* Copyright (C) 2017 Furrtek
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*
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* This file is part of PortaPack.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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#include "ui.hpp"
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#include "ui_navigation.hpp"
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#include "encoders.hpp"
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using namespace portapack;
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namespace encoders {
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size_t make_bitstream(std::string& fragments) {
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uint8_t byte = 0;
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size_t bitstream_length = 0;
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uint8_t * bitstream = shared_memory.bb_data.data;
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for (auto c : fragments) {
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byte <<= 1;
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if (c != '0')
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byte |= 1;
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if ((bitstream_length & 7) == 7)
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bitstream[bitstream_length >> 3] = byte;
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bitstream_length++;
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}
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// Finish last byte if needed
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size_t padding = 8 - (bitstream_length & 7);
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if (padding != 8) {
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byte <<= padding;
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bitstream[(bitstream_length + padding - 1) >> 3] = byte;
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padding++;
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}
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return bitstream_length;
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}
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void bitstream_append(size_t& bitstream_length, uint32_t bit_count, uint32_t bits) {
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uint8_t * bitstream = shared_memory.bb_data.data;
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uint32_t bit_mask = 1 << (bit_count - 1);
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uint32_t bit_index;
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uint8_t byte = 0;
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if (bitstream_length & 7)
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byte = bitstream[bitstream_length >> 3];
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bit_index = 7 - (bitstream_length & 7);
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for (size_t i = 0; i < bit_count; i++) {
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if (bits & bit_mask)
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byte |= (1 << bit_index);
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if (!bit_index) {
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bitstream[bitstream_length >> 3] = byte;
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byte = 0;
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}
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bit_index = (bit_index - 1) & 7;
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bits <<= 1;
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bitstream_length++;
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}
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bitstream[bitstream_length >> 3] = byte;
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}
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} /* namespace encoders */
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