crc64.h

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// This file's extension implies that it's C, but it's really -*- C++ -*-.
/*
  Copyright (C) 2002-2022 CERN for the benefit of the ATLAS collaboration
*/
/*
 */
// $Id$
#ifndef CXXUTILS_CRC64_H
#define CXXUTILS_CRC64_H
 
 
#include "CxxUtils/features.h"
#include <memory>
#include <cstdint>
#include <string>
 
 
// Use the vectorized version if we're compiling with gcc on x86_64.
// clang > 7 allows function multiversioning but some of the intrinsics we 
// use exist only for gcc
#if defined(__x86_64__) && HAVE_GCC_INTRINSICS
# define ATH_CRC64_VEC 1
#else
# define ATH_CRC64_VEC 0
#endif
 
 
// Forward declarations.
namespace CxxUtils {
class CRCTable;
void deleteCRCTable (CxxUtils::CRCTable* table);
}
 
 
namespace std {
template<>
struct default_delete<CxxUtils::CRCTable>
{
  void operator() (CxxUtils::CRCTable* table) const
  { deleteCRCTable (table); }
};
}
 
 
namespace CxxUtils {
 
 
class CRCTable;
 
 
std::unique_ptr<CRCTable> makeCRCTable (uint64_t p,
                                        uint64_t initial = 0xffffffffffffffff);
 
 
uint64_t crc64_bytewise (const CRCTable& table,
                         const char* data,
                         size_t data_len);
 
 
uint64_t crc64_bytewise (const char* data,
                         size_t data_len);
 
 
uint64_t crc64_bytewise (const std::string& s);
 
 
#if ATH_CRC64_VEC
 
__attribute__ ((target ("pclmul")))
uint64_t crc64 (const CRCTable& table,
                const char* data,
                size_t data_len);
#endif // ATH_CRC64_VEC
 
 
#if ATH_CRC64_VEC
__attribute__ ((target ("default")))
#endif
uint64_t crc64 (const CRCTable& table,
                const char* data,
                size_t data_len);
 
 
uint64_t crc64 (const char* data,
                size_t data_len);
 
 
uint64_t crc64 (const std::string& s);
 
 
uint64_t crc64addint (uint64_t crc, uint64_t x);
 
 
std::string crc64format (uint64_t crc);
 
 
 
 
std::string crc64digest (const std::string& str);
 
 
} // namespace CxxUtils
 
 
#endif // not CXXUTILS_CRC64_H