mirror of https://github.com/bsnes-emu/bsnes.git
123 lines
3.6 KiB
C++
123 lines
3.6 KiB
C++
#pragma once
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#include <nall/primitives.hpp>
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#include <nall/serializer.hpp>
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#include <nall/stdint.hpp>
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namespace nall {
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struct varint {
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virtual auto read() -> uint8_t = 0;
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virtual auto write(uint8_t) -> void = 0;
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auto readvu() -> uintmax {
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uintmax data = 0, shift = 1;
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while(true) {
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uint8_t x = read();
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data += (x & 0x7f) * shift;
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if(x & 0x80) break;
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shift <<= 7;
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data += shift;
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}
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return data;
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}
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auto readvs() -> intmax {
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uintmax data = readvu();
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bool negate = data & 1;
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data >>= 1;
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if(negate) data = ~data;
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return data;
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}
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auto writevu(uintmax data) -> void {
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while(true) {
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uint8_t x = data & 0x7f;
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data >>= 7;
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if(data == 0) return write(0x80 | x);
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write(x);
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data--;
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}
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}
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auto writevs(intmax data) -> void {
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bool negate = data < 0;
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if(negate) data = ~data;
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data = (data << 1) | negate;
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writevu(data);
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}
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};
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struct VariadicNatural {
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inline VariadicNatural() : mask(~0ull) { assign(0); }
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template<typename T> inline VariadicNatural(const T& value) : mask(~0ull) { assign(value); }
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inline operator uint64_t() const { return data; }
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template<typename T> inline auto& operator=(const T& value) { return assign(value); }
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inline auto operator++(int) { auto value = data; assign(data + 1); return value; }
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inline auto operator--(int) { auto value = data; assign(data - 1); return value; }
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inline auto& operator++() { return assign(data + 1); }
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inline auto& operator--() { return assign(data - 1); }
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inline auto& operator &=(const uint64_t value) { return assign(data & value); }
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inline auto& operator |=(const uint64_t value) { return assign(data | value); }
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inline auto& operator ^=(const uint64_t value) { return assign(data ^ value); }
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inline auto& operator<<=(const uint64_t value) { return assign(data << value); }
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inline auto& operator>>=(const uint64_t value) { return assign(data >> value); }
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inline auto& operator +=(const uint64_t value) { return assign(data + value); }
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inline auto& operator -=(const uint64_t value) { return assign(data - value); }
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inline auto& operator *=(const uint64_t value) { return assign(data * value); }
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inline auto& operator /=(const uint64_t value) { return assign(data / value); }
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inline auto& operator %=(const uint64_t value) { return assign(data % value); }
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inline auto resize(uint bits) {
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assert(bits <= 64);
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mask = ~0ull >> (64 - bits);
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data &= mask;
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}
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inline auto serialize(serializer& s) {
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s(data);
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s(mask);
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}
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struct Reference {
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inline Reference(VariadicNatural& self, uint lo, uint hi) : self(self), Lo(lo), Hi(hi) {}
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inline operator uint64_t() const {
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const uint64_t RangeBits = Hi - Lo + 1;
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const uint64_t RangeMask = (((1ull << RangeBits) - 1) << Lo) & self.mask;
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return (self & RangeMask) >> Lo;
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}
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inline auto& operator=(const uint64_t value) {
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const uint64_t RangeBits = Hi - Lo + 1;
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const uint64_t RangeMask = (((1ull << RangeBits) - 1) << Lo) & self.mask;
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self.data = (self.data & ~RangeMask) | ((value << Lo) & RangeMask);
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return *this;
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}
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private:
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VariadicNatural& self;
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const uint Lo;
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const uint Hi;
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};
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inline auto bits(uint lo, uint hi) -> Reference { return {*this, lo < hi ? lo : hi, hi > lo ? hi : lo}; }
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inline auto bit(uint index) -> Reference { return {*this, index, index}; }
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inline auto byte(uint index) -> Reference { return {*this, index * 8 + 0, index * 8 + 7}; }
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private:
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auto assign(uint64_t value) -> VariadicNatural& {
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data = value & mask;
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return *this;
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}
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uint64_t data;
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uint64_t mask;
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};
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}
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