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Merge branch 'fix_swap_endianness' into 'master'

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Fix implementation of Misc::swapEndiannessInplace

See merge request OpenMW/openmw!592
This commit is contained in:
psi29a 2021-02-07 11:26:32 +00:00
commit 9bd77e7d2c
1 changed files with 12 additions and 4 deletions
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16
components/misc/endianness.hpp
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@ -2,6 +2,8 @@
#define COMPONENTS_MISC_ENDIANNESS_H
#include <cstdint>
#include <cstring>
#include <type_traits>
namespace Misc
{
@ -15,20 +17,26 @@ namespace Misc
if constexpr (sizeof(T) == 2)
{
uint16_t& v16 = *reinterpret_cast<uint16_t*>(&v);
uint16_t v16;
std::memcpy(&v16, &v, sizeof(T));
v16 = (v16 >> 8) | (v16 << 8);
std::memcpy(&v, &v16, sizeof(T));
}
if constexpr (sizeof(T) == 4)
{
uint32_t& v32 = *reinterpret_cast<uint32_t*>(&v);
v32 = (v32 >> 24) | ((v32 >> 8) & 0xff00) | ((v32 & 0xff00) << 8) || v32 << 24;
uint32_t v32;
std::memcpy(&v32, &v, sizeof(T));
v32 = (v32 >> 24) | ((v32 >> 8) & 0xff00) | ((v32 & 0xff00) << 8) | v32 << 24;
std::memcpy(&v, &v32, sizeof(T));
}
if constexpr (sizeof(T) == 8)
{
uint64_t& v64 = *reinterpret_cast<uint64_t*>(&v);
uint64_t v64;
std::memcpy(&v64, &v, sizeof(T));
v64 = (v64 >> 56) | ((v64 & 0x00ff'0000'0000'0000) >> 40) | ((v64 & 0x0000'ff00'0000'0000) >> 24)
| ((v64 & 0x0000'00ff'0000'0000) >> 8) | ((v64 & 0x0000'0000'ff00'0000) << 8)
| ((v64 & 0x0000'0000'00ff'0000) << 24) | ((v64 & 0x0000'0000'0000'ff00) << 40) | (v64 << 56);
std::memcpy(&v, &v64, sizeof(T));
}
}