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/*
* Copyright (c) 2020, the SerenityOS developers.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <AK/Forward.h>
#include <AK/Platform.h>
namespace AK {
template<typename T>
ALWAYS_INLINE T convert_between_host_and_little_endian(T value)
{
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
return value;
#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
if constexpr (sizeof(T) == 8)
return __builtin_bswap64(value);
if constexpr (sizeof(T) == 4)
return __builtin_bswap32(value);
if constexpr (sizeof(T) == 2)
return __builtin_bswap16(value);
if constexpr (sizeof(T) == 1)
return value;
#endif
}
template<typename T>
ALWAYS_INLINE T convert_between_host_and_big_endian(T value)
{
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
if constexpr (sizeof(T) == 8)
return __builtin_bswap64(value);
if constexpr (sizeof(T) == 4)
return __builtin_bswap32(value);
if constexpr (sizeof(T) == 2)
return __builtin_bswap16(value);
if constexpr (sizeof(T) == 1)
return value;
#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
return value;
#endif
}
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 LittleEndian;
template<typename T>
InputStream& operator>>(InputStream&, LittleEndian<T>&);
template<typename T>
OutputStream& operator<<(OutputStream&, LittleEndian<T>);
template<typename T>
class [[gnu::packed]] LittleEndian
{
public:
friend InputStream& operator>><T>(InputStream&, LittleEndian<T>&);
friend OutputStream& operator<<<T>(OutputStream&, LittleEndian<T>);
LittleEndian() { }
LittleEndian(T value)
: m_value(convert_between_host_and_little_endian(value))
{
}
operator T() const { return convert_between_host_and_little_endian(m_value); }
private:
T m_value { 0 };
};
template<typename T>
class BigEndian;
template<typename T>
InputStream& operator>>(InputStream&, BigEndian<T>&);
template<typename T>
OutputStream& operator<<(OutputStream&, BigEndian<T>);
template<typename T>
class [[gnu::packed]] BigEndian
{
public:
friend InputStream& operator>><T>(InputStream&, BigEndian<T>&);
friend OutputStream& operator<<<T>(OutputStream&, BigEndian<T>);
BigEndian() { }
BigEndian(T value)
: m_value(convert_between_host_and_big_endian(value))
{
}
operator T() const { return convert_between_host_and_big_endian(m_value); }
private:
T m_value { 0 };
};
template<typename T>
using NetworkOrdered = BigEndian<T>;
}
using AK::BigEndian;
using AK::LittleEndian;
using AK::NetworkOrdered;
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