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annotate contrib/python-zstandard/zstd/common/xxhash.h @ 48674:f7086f6173f8 stable

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dirstate-v2: rename the configuration to enable the format The rename of the old experimental name was overlooked before the 6.0 release. We rename everything to use the new name (and keep the released name as an alias for compatibility). Differential Revision: https://phab.mercurial-scm.org/D12129
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Tue, 01 Feb 2022 16:36:20 +0100
parents b1fb341d8a61
children
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1 /*
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2 xxHash - Extremely Fast Hash algorithm
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3 Header File
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4 Copyright (C) 2012-2016, Yann Collet.
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5
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6 BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
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7
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8 Redistribution and use in source and binary forms, with or without
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9 modification, are permitted provided that the following conditions are
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10 met:
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11
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12 * Redistributions of source code must retain the above copyright
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13 notice, this list of conditions and the following disclaimer.
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14 * Redistributions in binary form must reproduce the above
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15 copyright notice, this list of conditions and the following disclaimer
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16 in the documentation and/or other materials provided with the
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17 distribution.
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18
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19 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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20 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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21 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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22 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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23 OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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24 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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25 LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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26 DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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27 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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28 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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29 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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30
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31 You can contact the author at :
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32 - xxHash source repository : https://github.com/Cyan4973/xxHash
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33 */
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34
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35 /* Notice extracted from xxHash homepage :
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36
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37 xxHash is an extremely fast Hash algorithm, running at RAM speed limits.
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38 It also successfully passes all tests from the SMHasher suite.
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39
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40 Comparison (single thread, Windows Seven 32 bits, using SMHasher on a Core 2 Duo @3GHz)
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41
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42 Name Speed Q.Score Author
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43 xxHash 5.4 GB/s 10
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44 CrapWow 3.2 GB/s 2 Andrew
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45 MumurHash 3a 2.7 GB/s 10 Austin Appleby
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46 SpookyHash 2.0 GB/s 10 Bob Jenkins
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47 SBox 1.4 GB/s 9 Bret Mulvey
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48 Lookup3 1.2 GB/s 9 Bob Jenkins
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49 SuperFastHash 1.2 GB/s 1 Paul Hsieh
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50 CityHash64 1.05 GB/s 10 Pike & Alakuijala
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51 FNV 0.55 GB/s 5 Fowler, Noll, Vo
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52 CRC32 0.43 GB/s 9
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53 MD5-32 0.33 GB/s 10 Ronald L. Rivest
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54 SHA1-32 0.28 GB/s 10
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55
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56 Q.Score is a measure of quality of the hash function.
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57 It depends on successfully passing SMHasher test set.
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58 10 is a perfect score.
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59
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60 A 64-bits version, named XXH64, is available since r35.
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61 It offers much better speed, but for 64-bits applications only.
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62 Name Speed on 64 bits Speed on 32 bits
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63 XXH64 13.8 GB/s 1.9 GB/s
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64 XXH32 6.8 GB/s 6.0 GB/s
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65 */
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66
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67 #if defined (__cplusplus)
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68 extern "C" {
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69 #endif
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70
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71 #ifndef XXHASH_H_5627135585666179
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72 #define XXHASH_H_5627135585666179 1
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73
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74
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75 /* ****************************
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76 * Definitions
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77 ******************************/
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78 #include <stddef.h> /* size_t */
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79 typedef enum { XXH_OK=0, XXH_ERROR } XXH_errorcode;
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80
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81
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82 /* ****************************
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83 * API modifier
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84 ******************************/
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85 /** XXH_PRIVATE_API
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86 * This is useful if you want to include xxhash functions in `static` mode
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87 * in order to inline them, and remove their symbol from the public list.
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88 * Methodology :
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89 * #define XXH_PRIVATE_API
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90 * #include "xxhash.h"
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91 * `xxhash.c` is automatically included.
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92 * It's not useful to compile and link it as a separate module anymore.
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93 */
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94 #ifdef XXH_PRIVATE_API
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95 # ifndef XXH_STATIC_LINKING_ONLY
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96 # define XXH_STATIC_LINKING_ONLY
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97 # endif
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98 # if defined(__GNUC__)
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99 # define XXH_PUBLIC_API static __inline __attribute__((unused))
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100 # elif defined (__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */)
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101 # define XXH_PUBLIC_API static inline
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102 # elif defined(_MSC_VER)
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103 # define XXH_PUBLIC_API static __inline
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104 # else
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105 # define XXH_PUBLIC_API static /* this version may generate warnings for unused static functions; disable the relevant warning */
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106 # endif
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107 #else
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108 # define XXH_PUBLIC_API /* do nothing */
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109 #endif /* XXH_PRIVATE_API */
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110
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111 /*!XXH_NAMESPACE, aka Namespace Emulation :
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112
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113 If you want to include _and expose_ xxHash functions from within your own library,
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114 but also want to avoid symbol collisions with another library which also includes xxHash,
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115
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116 you can use XXH_NAMESPACE, to automatically prefix any public symbol from xxhash library
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117 with the value of XXH_NAMESPACE (so avoid to keep it NULL and avoid numeric values).
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118
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119 Note that no change is required within the calling program as long as it includes `xxhash.h` :
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120 regular symbol name will be automatically translated by this header.
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121 */
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122 #ifdef XXH_NAMESPACE
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123 # define XXH_CAT(A,B) A##B
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124 # define XXH_NAME2(A,B) XXH_CAT(A,B)
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125 # define XXH32 XXH_NAME2(XXH_NAMESPACE, XXH32)
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126 # define XXH64 XXH_NAME2(XXH_NAMESPACE, XXH64)
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127 # define XXH_versionNumber XXH_NAME2(XXH_NAMESPACE, XXH_versionNumber)
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128 # define XXH32_createState XXH_NAME2(XXH_NAMESPACE, XXH32_createState)
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129 # define XXH64_createState XXH_NAME2(XXH_NAMESPACE, XXH64_createState)
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130 # define XXH32_freeState XXH_NAME2(XXH_NAMESPACE, XXH32_freeState)
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
131 # define XXH64_freeState XXH_NAME2(XXH_NAMESPACE, XXH64_freeState)
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
132 # define XXH32_reset XXH_NAME2(XXH_NAMESPACE, XXH32_reset)
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
133 # define XXH64_reset XXH_NAME2(XXH_NAMESPACE, XXH64_reset)
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
134 # define XXH32_update XXH_NAME2(XXH_NAMESPACE, XXH32_update)
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
135 # define XXH64_update XXH_NAME2(XXH_NAMESPACE, XXH64_update)
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
136 # define XXH32_digest XXH_NAME2(XXH_NAMESPACE, XXH32_digest)
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
137 # define XXH64_digest XXH_NAME2(XXH_NAMESPACE, XXH64_digest)
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
138 # define XXH32_copyState XXH_NAME2(XXH_NAMESPACE, XXH32_copyState)
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
139 # define XXH64_copyState XXH_NAME2(XXH_NAMESPACE, XXH64_copyState)
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
140 # define XXH32_canonicalFromHash XXH_NAME2(XXH_NAMESPACE, XXH32_canonicalFromHash)
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
141 # define XXH64_canonicalFromHash XXH_NAME2(XXH_NAMESPACE, XXH64_canonicalFromHash)
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
142 # define XXH32_hashFromCanonical XXH_NAME2(XXH_NAMESPACE, XXH32_hashFromCanonical)
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
143 # define XXH64_hashFromCanonical XXH_NAME2(XXH_NAMESPACE, XXH64_hashFromCanonical)
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
144 #endif
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
145
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
146
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
147 /* *************************************
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
148 * Version
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
149 ***************************************/
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
150 #define XXH_VERSION_MAJOR 0
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
151 #define XXH_VERSION_MINOR 6
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
152 #define XXH_VERSION_RELEASE 2
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
153 #define XXH_VERSION_NUMBER (XXH_VERSION_MAJOR *100*100 + XXH_VERSION_MINOR *100 + XXH_VERSION_RELEASE)
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
154 XXH_PUBLIC_API unsigned XXH_versionNumber (void);
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
155
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
156
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
157 /* ****************************
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
158 * Simple Hash Functions
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
159 ******************************/
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
160 typedef unsigned int XXH32_hash_t;
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
161 typedef unsigned long long XXH64_hash_t;
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
162
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
163 XXH_PUBLIC_API XXH32_hash_t XXH32 (const void* input, size_t length, unsigned int seed);
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
164 XXH_PUBLIC_API XXH64_hash_t XXH64 (const void* input, size_t length, unsigned long long seed);
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
165
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
166 /*!
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
167 XXH32() :
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
168 Calculate the 32-bits hash of sequence "length" bytes stored at memory address "input".
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
169 The memory between input & input+length must be valid (allocated and read-accessible).
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
170 "seed" can be used to alter the result predictably.
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
171 Speed on Core 2 Duo @ 3 GHz (single thread, SMHasher benchmark) : 5.4 GB/s
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
172 XXH64() :
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
173 Calculate the 64-bits hash of sequence of length "len" stored at memory address "input".
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
174 "seed" can be used to alter the result predictably.
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
175 This function runs 2x faster on 64-bits systems, but slower on 32-bits systems (see benchmark).
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
176 */
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
177
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
178
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
179 /* ****************************
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
180 * Streaming Hash Functions
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
181 ******************************/
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
182 typedef struct XXH32_state_s XXH32_state_t; /* incomplete type */
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
183 typedef struct XXH64_state_s XXH64_state_t; /* incomplete type */
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
184
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
185 /*! State allocation, compatible with dynamic libraries */
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
186
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
187 XXH_PUBLIC_API XXH32_state_t* XXH32_createState(void);
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
188 XXH_PUBLIC_API XXH_errorcode XXH32_freeState(XXH32_state_t* statePtr);
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
189
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
190 XXH_PUBLIC_API XXH64_state_t* XXH64_createState(void);
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
191 XXH_PUBLIC_API XXH_errorcode XXH64_freeState(XXH64_state_t* statePtr);
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
192
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
193
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
194 /* hash streaming */
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
195
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
196 XXH_PUBLIC_API XXH_errorcode XXH32_reset (XXH32_state_t* statePtr, unsigned int seed);
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
197 XXH_PUBLIC_API XXH_errorcode XXH32_update (XXH32_state_t* statePtr, const void* input, size_t length);
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
198 XXH_PUBLIC_API XXH32_hash_t XXH32_digest (const XXH32_state_t* statePtr);
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
199
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
200 XXH_PUBLIC_API XXH_errorcode XXH64_reset (XXH64_state_t* statePtr, unsigned long long seed);
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
201 XXH_PUBLIC_API XXH_errorcode XXH64_update (XXH64_state_t* statePtr, const void* input, size_t length);
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
202 XXH_PUBLIC_API XXH64_hash_t XXH64_digest (const XXH64_state_t* statePtr);
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
203
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
204 /*
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
205 These functions generate the xxHash of an input provided in multiple segments.
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
206 Note that, for small input, they are slower than single-call functions, due to state management.
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
207 For small input, prefer `XXH32()` and `XXH64()` .
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
208
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
209 XXH state must first be allocated, using XXH*_createState() .
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
210
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
211 Start a new hash by initializing state with a seed, using XXH*_reset().
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
212
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
213 Then, feed the hash state by calling XXH*_update() as many times as necessary.
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
214 Obviously, input must be allocated and read accessible.
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
215 The function returns an error code, with 0 meaning OK, and any other value meaning there is an error.
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
216
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
217 Finally, a hash value can be produced anytime, by using XXH*_digest().
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
218 This function returns the nn-bits hash as an int or long long.
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
219
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
220 It's still possible to continue inserting input into the hash state after a digest,
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
221 and generate some new hashes later on, by calling again XXH*_digest().
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
222
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
223 When done, free XXH state space if it was allocated dynamically.
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
224 */
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
225
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
226
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
227 /* **************************
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
228 * Utils
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
229 ****************************/
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
230 #if !(defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L)) /* ! C99 */
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
231 # define restrict /* disable restrict */
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
232 #endif
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
233
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
234 XXH_PUBLIC_API void XXH32_copyState(XXH32_state_t* restrict dst_state, const XXH32_state_t* restrict src_state);
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
235 XXH_PUBLIC_API void XXH64_copyState(XXH64_state_t* restrict dst_state, const XXH64_state_t* restrict src_state);
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
236
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
237
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
238 /* **************************
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
239 * Canonical representation
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
240 ****************************/
37495
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30434
diff changeset
241 /* Default result type for XXH functions are primitive unsigned 32 and 64 bits.
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30434
diff changeset
242 * The canonical representation uses human-readable write convention, aka big-endian (large digits first).
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30434
diff changeset
243 * These functions allow transformation of hash result into and from its canonical format.
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30434
diff changeset
244 * This way, hash values can be written into a file / memory, and remain comparable on different systems and programs.
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30434
diff changeset
245 */
30434
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
246 typedef struct { unsigned char digest[4]; } XXH32_canonical_t;
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
247 typedef struct { unsigned char digest[8]; } XXH64_canonical_t;
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
248
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
249 XXH_PUBLIC_API void XXH32_canonicalFromHash(XXH32_canonical_t* dst, XXH32_hash_t hash);
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
250 XXH_PUBLIC_API void XXH64_canonicalFromHash(XXH64_canonical_t* dst, XXH64_hash_t hash);
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
251
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
252 XXH_PUBLIC_API XXH32_hash_t XXH32_hashFromCanonical(const XXH32_canonical_t* src);
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
253 XXH_PUBLIC_API XXH64_hash_t XXH64_hashFromCanonical(const XXH64_canonical_t* src);
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
254
37495
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30434
diff changeset
255 #endif /* XXHASH_H_5627135585666179 */
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256
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257
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258
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259 /* ================================================================================================
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260 This section contains definitions which are not guaranteed to remain stable.
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261 They may change in future versions, becoming incompatible with a different version of the library.
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262 They shall only be used with static linking.
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263 Never use these definitions in association with dynamic linking !
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264 =================================================================================================== */
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265 #if defined(XXH_STATIC_LINKING_ONLY) && !defined(XXH_STATIC_H_3543687687345)
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266 #define XXH_STATIC_H_3543687687345
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267
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268 /* These definitions are only meant to allow allocation of XXH state
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269 statically, on stack, or in a struct for example.
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270 Do not use members directly. */
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271
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272 struct XXH32_state_s {
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273 unsigned total_len_32;
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274 unsigned large_len;
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275 unsigned v1;
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276 unsigned v2;
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277 unsigned v3;
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278 unsigned v4;
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279 unsigned mem32[4]; /* buffer defined as U32 for alignment */
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280 unsigned memsize;
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281 unsigned reserved; /* never read nor write, will be removed in a future version */
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282 }; /* typedef'd to XXH32_state_t */
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283
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284 struct XXH64_state_s {
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285 unsigned long long total_len;
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286 unsigned long long v1;
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287 unsigned long long v2;
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288 unsigned long long v3;
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289 unsigned long long v4;
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290 unsigned long long mem64[4]; /* buffer defined as U64 for alignment */
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291 unsigned memsize;
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292 unsigned reserved[2]; /* never read nor write, will be removed in a future version */
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293 }; /* typedef'd to XXH64_state_t */
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294
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295
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296 # ifdef XXH_PRIVATE_API
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297 # include "xxhash.c" /* include xxhash functions as `static`, for inlining */
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298 # endif
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299
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300 #endif /* XXH_STATIC_LINKING_ONLY && XXH_STATIC_H_3543687687345 */
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301
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302
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303 #if defined (__cplusplus)
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304 }
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305 #endif