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https://github.com/DarkStore-3DS/Project_CTR.git
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jakcron
69 lines
1.8 KiB
C++
69 lines
1.8 KiB
C++
/**
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* @file bitarray.h
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* @brief Declaration of tc::bn::bitarray
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* @author Jack (jakcron)
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* @version 0.2
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* @date 2021/02/27
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*/
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#pragma once
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#include <tc/types.h>
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namespace tc { namespace bn {
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/**
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* @struct bitarray
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* @brief This struct is a literal bitarray, with configurable byte and bit endianness.
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*
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* @tparam T size in bytes of the bitarray.
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* @tparam byte_order_le Boolean, true: byte order is little endian, false: byte order is big endian.
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* @tparam bit_order_le Boolean, true: bit order is little endian, false: bit order is big endian.
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*
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* @details
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* This struct is meant to be used when defining written-to-disk structures, like file headers.
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*/
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template <size_t T, bool byte_order_le = true, bool bit_order_le = true>
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struct bitarray
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{
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public:
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#define __BITARRAY_BYTE_INDEX_MATH(x) (byte_order_le? (x / 8) : (T - 1 - (x / 8)))
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#define __BITARRAY_BIT_INDEX_MATH(x) (bit_order_le? (1 << (x % 8)) : (1 << (7 - (x % 8))))
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/// Returns the size in bits of this bitarray
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size_t bit_size() const { return T * 8; }
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/// Sets a given bit in this bitarray
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void set(size_t bit)
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{
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bit %= (T*8);
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mArray[__BITARRAY_BYTE_INDEX_MATH(bit)] |= __BITARRAY_BIT_INDEX_MATH(bit);
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}
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/// Clears a given bit in this bitarray
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void reset(size_t bit)
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{
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bit %= (T*8);
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mArray[__BITARRAY_BYTE_INDEX_MATH(bit)] &= ~(uint8_t(__BITARRAY_BIT_INDEX_MATH(bit)));
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}
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/// Flips a given bit in this bitarray
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void flip(size_t bit)
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{
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bit %= (T*8);
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test(bit) ? reset(bit) : set(bit);
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}
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/// Checks a given bit in this bitarray
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bool test(size_t bit) const
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{
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bit %= (T*8);
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return (mArray[__BITARRAY_BYTE_INDEX_MATH(bit)] & (__BITARRAY_BIT_INDEX_MATH(bit))) != 0;
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}
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#undef __BITARRAY_BYTE_INDEX_MATH
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#undef __BITARRAY_BIT_INDEX_MATH
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private:
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std::array<uint8_t, T> mArray;
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};
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}} // namespace tc::bn
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