mirror of https://github.com/bsnes-emu/bsnes.git
117 lines
3.0 KiB
C++
117 lines
3.0 KiB
C++
#pragma once
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#include <nall/memory.hpp>
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namespace nall {
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struct bitvector {
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bitvector() = default;
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bitvector(uint size) { resize(size); }
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bitvector(const bitvector& source) { operator=(source); }
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bitvector(bitvector&& source) { operator=(move(source)); }
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~bitvector() { reset(); }
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auto operator=(const bitvector& source) -> bitvector& {
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bits = source.bits;
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pool = (uint8_t*)memory::resize(pool, bytes());
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memory::copy(pool, source.pool, bytes());
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return *this;
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}
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auto operator=(bitvector&& source) -> bitvector& {
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pool = source.pool;
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bits = source.bits;
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source.pool = nullptr;
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source.bits = 0;
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return *this;
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}
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explicit operator bool() const { return bits > 0; }
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auto empty() const -> bool { return bits == 0; }
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auto size() const -> uint { return bits; }
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auto bytes() const -> uint { return (bits + 7) / 8; }
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auto data() -> uint8_t* { return pool; }
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auto data() const -> const uint8_t* { return pool; }
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auto reset() -> void {
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if(pool) free(pool);
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pool = nullptr;
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bits = 0;
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}
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auto resize(uint size) -> void {
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uint from = bits;
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bits = size;
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for(uint n = size; n < from; n++) clear(n); //on reduce
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pool = (uint8_t*)memory::resize(pool, bytes());
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for(uint n = from; n < size; n++) clear(n); //on expand
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}
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auto get(uint position) const -> bool {
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return pool[position >> 3] & (0x80 >> (position & 7));
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}
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auto clear() -> void {
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memory::fill(pool, bytes(), 0x00);
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}
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auto set() -> void {
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memory::fill(pool, bytes(), 0xff);
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for(uint n = bits; n < bytes() * 8; n++) clear(n);
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}
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auto clear(uint position) -> void {
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pool[position >> 3] &= ~(0x80 >> (position & 7));
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}
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auto set(uint position) -> void {
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pool[position >> 3] |= (0x80 >> (position & 7));
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}
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auto invert(uint position) -> void {
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get(position) ? clear(position) : set(position);
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}
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auto set(uint position, bool value) -> void {
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value ? set(position) : clear(position);
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}
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struct reference {
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reference(bitvector& self, uint position) : self(self), position(position) {}
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operator bool() const { return self.get(position); }
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auto operator=(bool value) -> reference& { self.set(position, value); return *this; }
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protected:
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bitvector& self;
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uint position;
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};
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auto operator[](uint position) -> reference {
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return reference(*this, position);
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}
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auto operator[](uint position) const -> bool {
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return get(position);
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}
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struct iterator {
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iterator(bitvector& self, uint position) : self(self), position(position) {}
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auto operator!=(const iterator& source) const -> bool { return position != source.position; }
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auto operator++() -> iterator& { position++; return *this; }
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auto operator*() -> reference { return self.operator[](position); }
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protected:
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bitvector& self;
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uint position;
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};
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auto begin() -> iterator { return iterator(*this, 0); }
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auto end() -> iterator { return iterator(*this, bits); }
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protected:
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uint8_t* pool = nullptr;
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uint bits = 0;
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};
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}
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