mirror of
https://github.com/melonDS-emu/melonDS.git
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57 lines
1.8 KiB
C++
57 lines
1.8 KiB
C++
/*
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Copyright 2016-2024 melonDS team
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This file is part of melonDS.
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melonDS is free software: you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation, either version 3 of the License, or (at your option)
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any later version.
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melonDS is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with melonDS. If not, see http://www.gnu.org/licenses/.
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*/
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#ifndef MELONDS_UTILS_H
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#define MELONDS_UTILS_H
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#include <memory>
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#include "types.h"
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#include <utility>
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namespace melonDS
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{
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/// Ensures that the given array is a power of 2 in length.
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///
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/// @return If \c len is a power of 2, returns \c data and \c len unchanged
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/// without copying anything.
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/// If \c data is \c nullptr, returns <tt>{nullptr, 0}</tt>.
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/// Otherwise, return a copy of \c data with zero-padding to the next power of 2.
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/// @post \c data is \c nullptr, even if it doesn't need to be copied.
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std::pair<std::unique_ptr<u8[]>, u32> PadToPowerOf2(std::unique_ptr<u8[]>&& data, u32 len) noexcept;
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std::pair<std::unique_ptr<u8[]>, u32> PadToPowerOf2(const u8* data, u32 len) noexcept;
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std::unique_ptr<u8[]> CopyToUnique(const u8* data, u32 len) noexcept;
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template <typename T>
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T GetMSBit(T val)
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{
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val |= (val >> 1);
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val |= (val >> 2);
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val |= (val >> 4);
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if constexpr(sizeof(val) > 1) val |= (val >> 8);
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if constexpr(sizeof(val) > 2) val |= (val >> 16);
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if constexpr(sizeof(val) > 4) val |= (val >> 32);
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return val - (val >> 1);
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}
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}
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#endif // MELONDS_UTILS_H
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