1426cd3b3a
As many open source projects have started doing it, we're removing the current year from the copyright notice, so that we don't need to bump it every year. It seems like only the first year of publication is technically relevant for copyright notices, and even that seems to be something that many companies stopped listing altogether (in a version controlled codebase, the commits are a much better source of date of publication than a hardcoded copyright statement). We also now list Godot Engine contributors first as we're collectively the current maintainers of the project, and we clarify that the "exclusive" copyright of the co-founders covers the timespan before opensourcing (their further contributions are included as part of Godot Engine contributors). Also fixed "cf." Frenchism - it's meant as "refer to / see". Backported from #70885.
111 lines
4.2 KiB
C++
111 lines
4.2 KiB
C++
/**************************************************************************/
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/* bitfield_dynamic.h */
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/**************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/**************************************************************************/
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/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
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/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/**************************************************************************/
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#ifndef BITFIELD_DYNAMIC_H
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#define BITFIELD_DYNAMIC_H
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#include "core/error_macros.h"
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class BitFieldDynamic {
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public:
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~BitFieldDynamic() { destroy(); }
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private:
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// prevent copying (see effective C++ scott meyers)
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// there is no implementation for copy constructor, hence compiler will complain if you try to copy
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// feel free to add one if needed...
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BitFieldDynamic &operator=(const BitFieldDynamic &);
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public:
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// create automatically blanks
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void create(uint32_t p_num_bits, bool p_blank = true);
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void destroy();
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// public funcs
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uint32_t get_num_bits() const { return _num_bits; }
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uint32_t get_bit(uint32_t p_bit) const;
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void set_bit(uint32_t p_bit, uint32_t p_set);
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bool check_and_set(uint32_t p_bit);
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void blank(bool p_set_or_zero = false);
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void invert();
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void copy_from(const BitFieldDynamic &p_source);
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// loading / saving
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uint8_t *get_data() { return _data; }
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const uint8_t *get_data() const { return _data; }
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uint32_t get_num_bytes() const { return _num_bytes; }
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protected:
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// member vars
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uint8_t *_data = nullptr;
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uint32_t _num_bytes = 0;
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uint32_t _num_bits = 0;
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};
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inline uint32_t BitFieldDynamic::get_bit(uint32_t p_bit) const {
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DEV_ASSERT(_data);
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uint32_t byte_number = p_bit >> 3; // divide by 8
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DEV_ASSERT(byte_number < _num_bytes);
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uint8_t uc = _data[byte_number];
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uint32_t bit_set = uc & (1 << (p_bit & 7));
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return bit_set;
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}
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inline bool BitFieldDynamic::check_and_set(uint32_t p_bit) {
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DEV_ASSERT(_data);
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uint32_t byte_number = p_bit >> 3; // divide by 8
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DEV_ASSERT(byte_number < _num_bytes);
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uint8_t &uc = _data[byte_number];
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uint32_t mask = (1 << (p_bit & 7));
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uint32_t bit_set = uc & mask;
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if (bit_set) {
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return false;
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}
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// set
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uc = uc | mask;
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return true;
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}
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inline void BitFieldDynamic::set_bit(uint32_t p_bit, uint32_t p_set) {
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DEV_ASSERT(_data);
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uint32_t byte_number = p_bit >> 3; // divide by 8
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DEV_ASSERT(byte_number < _num_bytes);
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uint8_t uc = _data[byte_number];
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uint32_t mask = 1 << (p_bit & 7);
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if (p_set) {
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uc = uc | mask;
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} else {
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uc &= ~mask;
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}
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_data[byte_number] = uc;
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}
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#endif // BITFIELD_DYNAMIC_H
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