mirror of
https://gitlab.com/Mr_Goldberg/goldberg_emulator.git
synced 2024-11-14 00:18:58 +01:00
128 lines
No EOL
3.9 KiB
C++
128 lines
No EOL
3.9 KiB
C++
/*
|
|
* Copyright (C) Nemirtingas
|
|
* This file is part of System.
|
|
*
|
|
* System is free software; you can redistribute it
|
|
* and/or modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 3 of the License, or (at your option) any later version.
|
|
*
|
|
* System is distributed in the hope that it will be
|
|
* useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with System; if not, see
|
|
* <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <cstddef> // size_t
|
|
#include <cstdint> // uint*_t
|
|
|
|
namespace System {
|
|
class Endian
|
|
{
|
|
private:
|
|
template<typename T, size_t byte_count>
|
|
struct ByteSwapImpl
|
|
{
|
|
constexpr static inline T swap(T v)
|
|
{
|
|
for (int i = 0; i < (byte_count/2); ++i)
|
|
{
|
|
uint8_t tmp = reinterpret_cast<uint8_t*>(&v)[i];
|
|
reinterpret_cast<uint8_t*>(&v)[i] = reinterpret_cast<uint8_t*>(&v)[byte_count - i - 1];
|
|
reinterpret_cast<uint8_t*>(&v)[byte_count - i - 1] = tmp;
|
|
}
|
|
|
|
return v;
|
|
}
|
|
};
|
|
|
|
template<typename T>
|
|
struct ByteSwapImpl<T, 1>
|
|
{
|
|
constexpr static inline T swap(T v) { return v; }
|
|
};
|
|
|
|
template<typename T>
|
|
struct ByteSwapImpl<T, 2>
|
|
{
|
|
constexpr static inline T swap(T v)
|
|
{
|
|
uint16_t& tmp = *reinterpret_cast<uint16_t*>(&v);
|
|
tmp = ((tmp & 0x00ffu) << 8)
|
|
| ((tmp & 0xff00u) >> 8);
|
|
return v;
|
|
}
|
|
};
|
|
|
|
template<typename T>
|
|
struct ByteSwapImpl<T, 4>
|
|
{
|
|
constexpr static inline T swap(T v)
|
|
{
|
|
uint32_t& tmp = *reinterpret_cast<uint32_t*>(&v);
|
|
tmp = ((tmp & 0x000000fful) << 24)
|
|
| ((tmp & 0x0000ff00ul) << 8)
|
|
| ((tmp & 0x00ff0000ul) >> 8)
|
|
| ((tmp & 0xff000000ul) >> 24);
|
|
return v;
|
|
}
|
|
};
|
|
|
|
template<typename T>
|
|
struct ByteSwapImpl<T, 8>
|
|
{
|
|
constexpr static inline T swap(T v)
|
|
{
|
|
uint64_t& tmp = *reinterpret_cast<uint64_t*>(&v);
|
|
tmp = ((tmp & 0x00000000000000ffull) << 56)
|
|
| ((tmp & 0x000000000000ff00ull) << 40)
|
|
| ((tmp & 0x0000000000ff0000ull) << 24)
|
|
| ((tmp & 0x00000000ff000000ull) << 8)
|
|
| ((tmp & 0x000000ff00000000ull) >> 8)
|
|
| ((tmp & 0x0000ff0000000000ull) >> 24)
|
|
| ((tmp & 0x00ff000000000000ull) >> 40)
|
|
| ((tmp & 0xff00000000000000ull) >> 56);
|
|
return v;
|
|
}
|
|
};
|
|
|
|
public:
|
|
static inline bool little()
|
|
{
|
|
const uint32_t endian_magic = 0x01020304;
|
|
return reinterpret_cast<const uint8_t*>(&endian_magic)[0] == 0x04;
|
|
}
|
|
|
|
static inline bool big()
|
|
{
|
|
const uint32_t endian_magic = 0x01020304;
|
|
return reinterpret_cast<const uint8_t*>(&endian_magic)[0] == 0x01;
|
|
}
|
|
|
|
template<typename T, size_t Size = sizeof(T)>
|
|
constexpr static inline T net_swap(T v)
|
|
{
|
|
if(Endian::little())
|
|
{
|
|
return ByteSwapImpl<T, Size>::swap(v);
|
|
}
|
|
|
|
return v;
|
|
}
|
|
|
|
template<typename T, size_t Size = sizeof(T)>
|
|
constexpr static inline T swap(T v)
|
|
{
|
|
return ByteSwapImpl<T, Size>::swap(v);
|
|
}
|
|
|
|
private:
|
|
Endian() = delete;
|
|
};
|
|
} |