mirror of
https://github.com/Relintai/pandemonium_engine_minimal.git
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85 lines
2.1 KiB
C++
85 lines
2.1 KiB
C++
#ifndef BITFIELD_DYNAMIC_H
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#define BITFIELD_DYNAMIC_H
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/* bitfield_dynamic.h */
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#include "core/error/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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