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#include "crc32c.h"
#include <util/generic/singleton.h>
#include <contrib/libs/crcutil/interface.h>
namespace {
typedef crcutil_interface::CRC TCrc;
struct TCrcUtilSse4 {
TCrc* const Pimpl;
TCrcUtilSse4() noexcept
: Pimpl(TCrc::Create(0x82f63b78, 0, 32, true, 0, 0, 0, TCrc::IsSSE42Available(), nullptr))
{
}
~TCrcUtilSse4() noexcept {
Pimpl->Delete();
}
inline ui32 Extend(ui32 init, const void* data, size_t n) const noexcept {
crcutil_interface::UINT64 sum = init;
Pimpl->Compute(data, n, &sum);
return (ui32)sum;
}
inline ui32 Combine(ui32 blockACrc, ui32 blockBCrc, size_t blockBSize) const noexcept {
crcutil_interface::UINT64 sum = blockACrc;
Pimpl->Concatenate(blockBCrc, 0, blockBSize, &sum);
return (ui32)sum;
}
};
}
ui32 Crc32c(const void* p, size_t size) noexcept {
return Singleton<TCrcUtilSse4>()->Extend(0, p, size);
}
ui32 Crc32cExtend(ui32 init, const void* data, size_t n) noexcept {
return Singleton<TCrcUtilSse4>()->Extend(init, data, n);
}
ui32 Crc32cCombine(ui32 blockACrc, ui32 blockBCrc, size_t blockBSize) noexcept {
return Singleton<TCrcUtilSse4>()->Combine(blockACrc, blockBCrc, blockBSize);
}
bool HaveFastCrc32c() noexcept {
return TCrc::IsSSE42Available();
}
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