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rAKA akantu
aka_str_hash.hh
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/**
* @file aka_str_hash.hh
*
* @author Nicolas Richart
*
* @date creation lun déc 09 2019
*
* @brief A Documented file.
*
* @section LICENSE
*
* Copyright (©) 2010-2011 EPFL (Ecole Polytechnique Fédérale de Lausanne)
* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
*
* akantu-iterators is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by the
* Free Software Foundation, either version 3 of the License, or (at your
* option) any later version.
*
* akantu-iterators is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with akantu-iterators. If not, see <http://www.gnu.org/licenses/>.
*
*/
/* -------------------------------------------------------------------------- */
#include <cstddef>
#include <cstdint>
#include <type_traits>
#include <initializer_list>
/* -------------------------------------------------------------------------- */
#ifndef AKANTU_AKA_STR_HASH_HH
#define AKANTU_AKA_STR_HASH_HH
#ifndef AKANTU_ITERATORS_NAMESPACE
#define AKANTU_ITERATORS_NAMESPACE akantu
#endif
namespace
AKANTU_ITERATORS_NAMESPACE
{
namespace
hash
{
namespace
details
{
// CRC32 Table (zlib polynomial)
static
constexpr
uint32_t
crc_table
[
256
]
=
{
0x00000000L
,
0x77073096L
,
0xee0e612cL
,
0x990951baL
,
0x076dc419L
,
0x706af48fL
,
0xe963a535L
,
0x9e6495a3L
,
0x0edb8832L
,
0x79dcb8a4L
,
0xe0d5e91eL
,
0x97d2d988L
,
0x09b64c2bL
,
0x7eb17cbdL
,
0xe7b82d07L
,
0x90bf1d91L
,
0x1db71064L
,
0x6ab020f2L
,
0xf3b97148L
,
0x84be41deL
,
0x1adad47dL
,
0x6ddde4ebL
,
0xf4d4b551L
,
0x83d385c7L
,
0x136c9856L
,
0x646ba8c0L
,
0xfd62f97aL
,
0x8a65c9ecL
,
0x14015c4fL
,
0x63066cd9L
,
0xfa0f3d63L
,
0x8d080df5L
,
0x3b6e20c8L
,
0x4c69105eL
,
0xd56041e4L
,
0xa2677172L
,
0x3c03e4d1L
,
0x4b04d447L
,
0xd20d85fdL
,
0xa50ab56bL
,
0x35b5a8faL
,
0x42b2986cL
,
0xdbbbc9d6L
,
0xacbcf940L
,
0x32d86ce3L
,
0x45df5c75L
,
0xdcd60dcfL
,
0xabd13d59L
,
0x26d930acL
,
0x51de003aL
,
0xc8d75180L
,
0xbfd06116L
,
0x21b4f4b5L
,
0x56b3c423L
,
0xcfba9599L
,
0xb8bda50fL
,
0x2802b89eL
,
0x5f058808L
,
0xc60cd9b2L
,
0xb10be924L
,
0x2f6f7c87L
,
0x58684c11L
,
0xc1611dabL
,
0xb6662d3dL
,
0x76dc4190L
,
0x01db7106L
,
0x98d220bcL
,
0xefd5102aL
,
0x71b18589L
,
0x06b6b51fL
,
0x9fbfe4a5L
,
0xe8b8d433L
,
0x7807c9a2L
,
0x0f00f934L
,
0x9609a88eL
,
0xe10e9818L
,
0x7f6a0dbbL
,
0x086d3d2dL
,
0x91646c97L
,
0xe6635c01L
,
0x6b6b51f4L
,
0x1c6c6162L
,
0x856530d8L
,
0xf262004eL
,
0x6c0695edL
,
0x1b01a57bL
,
0x8208f4c1L
,
0xf50fc457L
,
0x65b0d9c6L
,
0x12b7e950L
,
0x8bbeb8eaL
,
0xfcb9887cL
,
0x62dd1ddfL
,
0x15da2d49L
,
0x8cd37cf3L
,
0xfbd44c65L
,
0x4db26158L
,
0x3ab551ceL
,
0xa3bc0074L
,
0xd4bb30e2L
,
0x4adfa541L
,
0x3dd895d7L
,
0xa4d1c46dL
,
0xd3d6f4fbL
,
0x4369e96aL
,
0x346ed9fcL
,
0xad678846L
,
0xda60b8d0L
,
0x44042d73L
,
0x33031de5L
,
0xaa0a4c5fL
,
0xdd0d7cc9L
,
0x5005713cL
,
0x270241aaL
,
0xbe0b1010L
,
0xc90c2086L
,
0x5768b525L
,
0x206f85b3L
,
0xb966d409L
,
0xce61e49fL
,
0x5edef90eL
,
0x29d9c998L
,
0xb0d09822L
,
0xc7d7a8b4L
,
0x59b33d17L
,
0x2eb40d81L
,
0xb7bd5c3bL
,
0xc0ba6cadL
,
0xedb88320L
,
0x9abfb3b6L
,
0x03b6e20cL
,
0x74b1d29aL
,
0xead54739L
,
0x9dd277afL
,
0x04db2615L
,
0x73dc1683L
,
0xe3630b12L
,
0x94643b84L
,
0x0d6d6a3eL
,
0x7a6a5aa8L
,
0xe40ecf0bL
,
0x9309ff9dL
,
0x0a00ae27L
,
0x7d079eb1L
,
0xf00f9344L
,
0x8708a3d2L
,
0x1e01f268L
,
0x6906c2feL
,
0xf762575dL
,
0x806567cbL
,
0x196c3671L
,
0x6e6b06e7L
,
0xfed41b76L
,
0x89d32be0L
,
0x10da7a5aL
,
0x67dd4accL
,
0xf9b9df6fL
,
0x8ebeeff9L
,
0x17b7be43L
,
0x60b08ed5L
,
0xd6d6a3e8L
,
0xa1d1937eL
,
0x38d8c2c4L
,
0x4fdff252L
,
0xd1bb67f1L
,
0xa6bc5767L
,
0x3fb506ddL
,
0x48b2364bL
,
0xd80d2bdaL
,
0xaf0a1b4cL
,
0x36034af6L
,
0x41047a60L
,
0xdf60efc3L
,
0xa867df55L
,
0x316e8eefL
,
0x4669be79L
,
0xcb61b38cL
,
0xbc66831aL
,
0x256fd2a0L
,
0x5268e236L
,
0xcc0c7795L
,
0xbb0b4703L
,
0x220216b9L
,
0x5505262fL
,
0xc5ba3bbeL
,
0xb2bd0b28L
,
0x2bb45a92L
,
0x5cb36a04L
,
0xc2d7ffa7L
,
0xb5d0cf31L
,
0x2cd99e8bL
,
0x5bdeae1dL
,
0x9b64c2b0L
,
0xec63f226L
,
0x756aa39cL
,
0x026d930aL
,
0x9c0906a9L
,
0xeb0e363fL
,
0x72076785L
,
0x05005713L
,
0x95bf4a82L
,
0xe2b87a14L
,
0x7bb12baeL
,
0x0cb61b38L
,
0x92d28e9bL
,
0xe5d5be0dL
,
0x7cdcefb7L
,
0x0bdbdf21L
,
0x86d3d2d4L
,
0xf1d4e242L
,
0x68ddb3f8L
,
0x1fda836eL
,
0x81be16cdL
,
0xf6b9265bL
,
0x6fb077e1L
,
0x18b74777L
,
0x88085ae6L
,
0xff0f6a70L
,
0x66063bcaL
,
0x11010b5cL
,
0x8f659effL
,
0xf862ae69L
,
0x616bffd3L
,
0x166ccf45L
,
0xa00ae278L
,
0xd70dd2eeL
,
0x4e048354L
,
0x3903b3c2L
,
0xa7672661L
,
0xd06016f7L
,
0x4969474dL
,
0x3e6e77dbL
,
0xaed16a4aL
,
0xd9d65adcL
,
0x40df0b66L
,
0x37d83bf0L
,
0xa9bcae53L
,
0xdebb9ec5L
,
0x47b2cf7fL
,
0x30b5ffe9L
,
0xbdbdf21cL
,
0xcabac28aL
,
0x53b39330L
,
0x24b4a3a6L
,
0xbad03605L
,
0xcdd70693L
,
0x54de5729L
,
0x23d967bfL
,
0xb3667a2eL
,
0xc4614ab8L
,
0x5d681b02L
,
0x2a6f2b94L
,
0xb40bbe37L
,
0xc30c8ea1L
,
0x5a05df1bL
,
0x2d02ef8dL
};
/* --------------------------------------------------------------------------
*/
/// CRC32 hashing algorithm
constexpr
uint32_t
crc32_hash
(
const
char
*
str
,
size_t
idx
)
{
auto
crc
=
(
idx
==
0
?
0xFFFFFFFF
:
crc32_hash
(
str
,
idx
-
1
));
return
(
crc
>>
8
)
^
crc_table
[(
crc
^
str
[
idx
])
&
0x000000FF
];
}
namespace
{
template
<
typename
Hash
>
constexpr
Hash
fnv1a_offset
=
0x0
;
template
<>
constexpr
uint64_t
fnv1a_offset
<
uint64_t
>
=
0xcbf29ce484222325
;
template
<>
constexpr
uint32_t
fnv1a_offset
<
uint32_t
>
=
0x811c9dc5
;
template
<
typename
Hash
>
constexpr
Hash
fnv1a_prime
=
0x0
;
template
<>
constexpr
uint64_t
fnv1a_prime
<
uint64_t
>
=
0x00000100000001b3
;
template
<>
constexpr
uint32_t
fnv1a_prime
<
uint32_t
>
=
0x01000193
;
}
// namespace
template
<
class
T
,
T
offset
=
fnv1a_offset
<
T
>
,
T
prime
=
fnv1a_prime
<
T
>>
constexpr
T
fnv1a_hash
(
const
char
*
str
,
size_t
idx
)
{
return
((
idx
?
fnv1a_hash
<
T
,
offset
,
prime
>
(
str
,
idx
-
1
)
:
offset
)
^
str
[
idx
])
*
prime
;
}
// FNV-1a 32bit hashing algorithm.
constexpr
decltype
(
auto
)
fnv1a_32_hash
(
const
char
*
str
,
size_t
idx
)
{
return
fnv1a_hash
<
uint32_t
>
(
str
,
idx
);
}
// FNV-1a 32bit hashing algorithm.
constexpr
decltype
(
auto
)
fnv1a_64_hash
(
const
char
*
str
,
size_t
idx
)
{
return
fnv1a_hash
<
uint64_t
>
(
str
,
idx
);
}
template
<
typename
Hash
,
typename
CharT
,
CharT
...
chars
>
constexpr
Hash
fnv1a
()
{
auto
result
=
fnv1a_offset
<
Hash
>
;
(
void
)
std
::
initializer_list
<
Hash
>
{
(
result
=
(
result
^
chars
)
*
fnv1a_prime
<
Hash
>
,
Hash
{})...};
return
result
;
}
}
// namespace details
constexpr
uint32_t
operator
""
_crc32
(
const
char
*
str
,
size_t
size
)
{
return
details
::
crc32_hash
(
str
,
size
-
1
)
^
0xFFFFFFFF
;
}
constexpr
uint32_t
operator
""
_fnv1a32
(
const
char
*
str
,
size_t
size
)
{
return
details
::
fnv1a_32_hash
(
str
,
size
-
1
);
}
constexpr
uint64_t
operator
""
_fnv1a64
(
const
char
*
str
,
size_t
size
)
{
return
details
::
fnv1a_64_hash
(
str
,
size
-
1
);
}
}
// namespace hash
template
<
typename
CharT
,
CharT
...
chars
>
struct
string_literal
{
static
constexpr
uint64_t
hash
=
hash
::
details
::
fnv1a
<
uint64_t
,
CharT
,
chars
...
>
();
using
hash_type
=
std
::
integral_constant
<
uint64_t
,
hash
>
;
};
template
<
typename
CharT
,
CharT
...
chars
>
constexpr
uint64_t
string_literal
<
CharT
,
chars
...
>::
hash
;
constexpr
auto
operator
""
_h
(
const
char
*
str
,
size_t
size
)
{
return
hash
::
details
::
fnv1a_64_hash
(
str
,
size
-
1
);
}
}
// namespace AKANTU_ITERATOR_NAMESPACE
#endif
/* AKANTU_AKA_STR_HASH_HH */
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