mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-12-26 20:55:35 +03:00
677bcea771
Instead of polluting global namespace with definitions from libkern/OSByteOrder.h and machine/endian.h on MacOS, just use AK functions for conversions.
125 lines
3.4 KiB
C++
125 lines
3.4 KiB
C++
/*
|
|
* Copyright (c) 2020, the SerenityOS developers.
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <AK/Format.h>
|
|
#include <AK/Forward.h>
|
|
#include <AK/Platform.h>
|
|
|
|
namespace AK {
|
|
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
|
|
inline constexpr static bool HostIsLittleEndian = true;
|
|
#else
|
|
inline constexpr static bool HostIsLittleEndian = false;
|
|
#endif
|
|
|
|
template<typename T>
|
|
ALWAYS_INLINE constexpr T convert_between_host_and_little_endian(T value)
|
|
{
|
|
if constexpr (HostIsLittleEndian || sizeof(T) == 1)
|
|
return value;
|
|
else if constexpr (sizeof(T) == 8)
|
|
return static_cast<T>(__builtin_bswap64(static_cast<u64>(value)));
|
|
else if constexpr (sizeof(T) == 4)
|
|
return static_cast<T>(__builtin_bswap32(static_cast<u32>(value)));
|
|
else if constexpr (sizeof(T) == 2)
|
|
return static_cast<T>(__builtin_bswap16(static_cast<u16>(value)));
|
|
else
|
|
static_assert(DependentFalse<T>, "Cannot byte-swap values larger than 64-bits");
|
|
}
|
|
|
|
template<typename T>
|
|
ALWAYS_INLINE constexpr T convert_between_host_and_big_endian(T value)
|
|
{
|
|
if constexpr (sizeof(T) == 1 || !HostIsLittleEndian)
|
|
return value;
|
|
else if constexpr (sizeof(T) == 8)
|
|
return static_cast<T>(__builtin_bswap64(static_cast<u64>(value)));
|
|
else if constexpr (sizeof(T) == 4)
|
|
return static_cast<T>(__builtin_bswap32(static_cast<u32>(value)));
|
|
else if constexpr (sizeof(T) == 2)
|
|
return static_cast<T>(__builtin_bswap16(static_cast<u16>(value)));
|
|
else
|
|
static_assert(DependentFalse<T>, "Cannot byte-swap values larger than 64-bits");
|
|
}
|
|
|
|
template<typename T>
|
|
ALWAYS_INLINE T convert_between_host_and_network_endian(T value)
|
|
{
|
|
return convert_between_host_and_big_endian(value);
|
|
}
|
|
|
|
template<typename T>
|
|
class [[gnu::packed]] LittleEndian {
|
|
public:
|
|
constexpr LittleEndian() = default;
|
|
|
|
constexpr LittleEndian(T value)
|
|
: m_value(convert_between_host_and_little_endian(value))
|
|
{
|
|
}
|
|
|
|
constexpr operator T() const { return convert_between_host_and_little_endian(m_value); }
|
|
|
|
private:
|
|
T m_value { 0 };
|
|
};
|
|
|
|
template<typename T>
|
|
class [[gnu::packed]] BigEndian {
|
|
public:
|
|
constexpr BigEndian() = default;
|
|
|
|
constexpr BigEndian(T value)
|
|
: m_value(convert_between_host_and_big_endian(value))
|
|
{
|
|
}
|
|
|
|
constexpr operator T() const { return convert_between_host_and_big_endian(m_value); }
|
|
|
|
private:
|
|
T m_value { 0 };
|
|
};
|
|
|
|
template<typename T>
|
|
using NetworkOrdered = BigEndian<T>;
|
|
|
|
template<typename T>
|
|
requires(HasFormatter<T>) struct Formatter<LittleEndian<T>> : Formatter<T> {
|
|
};
|
|
|
|
template<typename T>
|
|
requires(HasFormatter<T>) struct Formatter<BigEndian<T>> : Formatter<T> {
|
|
};
|
|
|
|
template<typename T>
|
|
struct Traits<LittleEndian<T>> : public DefaultTraits<LittleEndian<T>> {
|
|
static constexpr bool is_trivially_serializable() { return Traits<T>::is_trivially_serializable(); }
|
|
};
|
|
|
|
template<typename T>
|
|
struct Traits<BigEndian<T>> : public DefaultTraits<BigEndian<T>> {
|
|
static constexpr bool is_trivially_serializable() { return Traits<T>::is_trivially_serializable(); }
|
|
};
|
|
|
|
constexpr u16 bitswap(u16 v)
|
|
{
|
|
v = ((v >> 1) & 0x5555) | ((v & 0x5555) << 1); // even & odd bits
|
|
v = ((v >> 2) & 0x3333) | ((v & 0x3333) << 2); // pairs
|
|
v = ((v >> 4) & 0x0F0F) | ((v & 0x0F0F) << 4); // nibbles
|
|
return ((v >> 8) & 0x00FF) | ((v & 0x00FF) << 8); // bytes
|
|
}
|
|
|
|
}
|
|
|
|
#if USING_AK_GLOBALLY
|
|
using AK::BigEndian;
|
|
using AK::bitswap;
|
|
using AK::LittleEndian;
|
|
using AK::NetworkOrdered;
|
|
#endif
|