YugabyteDB (2.13.0.0-b42, bfc6a6643e7399ac8a0e81d06a3ee6d6571b33ab)

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#include "yb/util/crc.h"

#include <crcutil/interface.h>

#include "yb/gutil/once.h"

#include "yb/util/debug/leakcheck_disabler.h"

namespace yb {

namespace crc {

using debug::ScopedLeakCheckDisabler;

static GoogleOnceType crc32c_once = GOOGLE_ONCE_INIT;

static Crc* crc32c_instance = nullptr;

static void InitCrc32cInstance() {

  ScopedLeakCheckDisabler disabler; // CRC instance is never freed.

  // TODO: Is initial = 0 and roll window = 4 appropriate for all cases?

  crc32c_instance = crcutil_interface::CRC::CreateCrc32c(true, 0, 4, nullptr);

}

Crc* GetCrc32cInstance() {

  GoogleOnceInit(&crc32c_once, &InitCrc32cInstance);

  return crc32c_instance;

}

uint32_t Crc32c(const void* data, size_t length) {

  uint64_t crc32 = 0;

  GetCrc32cInstance()->Compute(data, length, &crc32);

  return static_cast<uint32_t>(crc32); // Only uses lower 32 bits.

}

} // namespace crc

} // namespace yb