112 lines
4.2 KiB
C++
112 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) 2007-2021 Juan Linietsky, Ariel Manzur. */
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/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md). */
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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
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