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xxhash.h
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xxhash.h
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/*
* xxHash - Extremely Fast Hash algorithm
* Header File
* Copyright (C) 2012-2021 Yann Collet
*
* BSD 2-Clause License (https://www.opensource.org/licenses/bsd-license.php)
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* You can contact the author at:
* - xxHash homepage: https://www.xxhash.com
* - xxHash source repository: https://github.com/Cyan4973/xxHash
*/
/*!
* @mainpage xxHash
*
* xxHash is an extremely fast non-cryptographic hash algorithm, working at RAM speed
* limits.
*
* It is proposed in four flavors, in three families:
* 1. @ref XXH32_family
* - Classic 32-bit hash function. Simple, compact, and runs on almost all
* 32-bit and 64-bit systems.
* 2. @ref XXH64_family
* - Classic 64-bit adaptation of XXH32. Just as simple, and runs well on most
* 64-bit systems (but _not_ 32-bit systems).
* 3. @ref XXH3_family
* - Modern 64-bit and 128-bit hash function family which features improved
* strength and performance across the board, especially on smaller data.
* It benefits greatly from SIMD and 64-bit without requiring it.
*
* Benchmarks
* ---
* The reference system uses an Intel i7-9700K CPU, and runs Ubuntu x64 20.04.
* The open source benchmark program is compiled with clang v10.0 using -O3 flag.
*
* | Hash Name | ISA ext | Width | Large Data Speed | Small Data Velocity |
* | -------------------- | ------- | ----: | ---------------: | ------------------: |
* | XXH3_64bits() | @b AVX2 | 64 | 59.4 GB/s | 133.1 |
* | MeowHash | AES-NI | 128 | 58.2 GB/s | 52.5 |
* | XXH3_128bits() | @b AVX2 | 128 | 57.9 GB/s | 118.1 |
* | CLHash | PCLMUL | 64 | 37.1 GB/s | 58.1 |
* | XXH3_64bits() | @b SSE2 | 64 | 31.5 GB/s | 133.1 |
* | XXH3_128bits() | @b SSE2 | 128 | 29.6 GB/s | 118.1 |
* | RAM sequential read | | N/A | 28.0 GB/s | N/A |
* | ahash | AES-NI | 64 | 22.5 GB/s | 107.2 |
* | City64 | | 64 | 22.0 GB/s | 76.6 |
* | T1ha2 | | 64 | 22.0 GB/s | 99.0 |
* | City128 | | 128 | 21.7 GB/s | 57.7 |
* | FarmHash | AES-NI | 64 | 21.3 GB/s | 71.9 |
* | XXH64() | | 64 | 19.4 GB/s | 71.0 |
* | SpookyHash | | 64 | 19.3 GB/s | 53.2 |
* | Mum | | 64 | 18.0 GB/s | 67.0 |
* | CRC32C | SSE4.2 | 32 | 13.0 GB/s | 57.9 |
* | XXH32() | | 32 | 9.7 GB/s | 71.9 |
* | City32 | | 32 | 9.1 GB/s | 66.0 |
* | Blake3* | @b AVX2 | 256 | 4.4 GB/s | 8.1 |
* | Murmur3 | | 32 | 3.9 GB/s | 56.1 |
* | SipHash* | | 64 | 3.0 GB/s | 43.2 |
* | Blake3* | @b SSE2 | 256 | 2.4 GB/s | 8.1 |
* | HighwayHash | | 64 | 1.4 GB/s | 6.0 |
* | FNV64 | | 64 | 1.2 GB/s | 62.7 |
* | Blake2* | | 256 | 1.1 GB/s | 5.1 |
* | SHA1* | | 160 | 0.8 GB/s | 5.6 |
* | MD5* | | 128 | 0.6 GB/s | 7.8 |
* @note
* - Hashes which require a specific ISA extension are noted. SSE2 is also noted,
* even though it is mandatory on x64.
* - Hashes with an asterisk are cryptographic. Note that MD5 is non-cryptographic
* by modern standards.
* - Small data velocity is a rough average of algorithm's efficiency for small
* data. For more accurate information, see the wiki.
* - More benchmarks and strength tests are found on the wiki:
* https://github.com/Cyan4973/xxHash/wiki
*
* Usage
* ------
* All xxHash variants use a similar API. Changing the algorithm is a trivial
* substitution.
*
* @pre
* For functions which take an input and length parameter, the following
* requirements are assumed:
* - The range from [`input`, `input + length`) is valid, readable memory.
* - The only exception is if the `length` is `0`, `input` may be `NULL`.
* - For C++, the objects must have the *TriviallyCopyable* property, as the
* functions access bytes directly as if it was an array of `unsigned char`.
*
* @anchor single_shot_example
* **Single Shot**
*
* These functions are stateless functions which hash a contiguous block of memory,
* immediately returning the result. They are the easiest and usually the fastest
* option.
*
* XXH32(), XXH64(), XXH3_64bits(), XXH3_128bits()
*
* @code{.c}
* #include <string.h>
* #include "xxhash.h"
*
* // Example for a function which hashes a null terminated string with XXH32().
* XXH32_hash_t hash_string(const char* string, XXH32_hash_t seed)
* {
* // NULL pointers are only valid if the length is zero
* size_t length = (string == NULL) ? 0 : strlen(string);
* return XXH32(string, length, seed);
* }
* @endcode
*
* @anchor streaming_example
* **Streaming**
*
* These groups of functions allow incremental hashing of unknown size, even
* more than what would fit in a size_t.
*
* XXH32_reset(), XXH64_reset(), XXH3_64bits_reset(), XXH3_128bits_reset()
*
* @code{.c}
* #include <stdio.h>
* #include <assert.h>
* #include "xxhash.h"
* // Example for a function which hashes a FILE incrementally with XXH3_64bits().
* XXH64_hash_t hashFile(FILE* f)
* {
* // Allocate a state struct. Do not just use malloc() or new.
* XXH3_state_t* state = XXH3_createState();
* assert(state != NULL && "Out of memory!");
* // Reset the state to start a new hashing session.
* XXH3_64bits_reset(state);
* char buffer[4096];
* size_t count;
* // Read the file in chunks
* while ((count = fread(buffer, 1, sizeof(buffer), f)) != 0) {
* // Run update() as many times as necessary to process the data
* XXH3_64bits_update(state, buffer, count);
* }
* // Retrieve the finalized hash. This will not change the state.
* XXH64_hash_t result = XXH3_64bits_digest(state);
* // Free the state. Do not use free().
* XXH3_freeState(state);
* return result;
* }
* @endcode
*
* @file xxhash.h
* xxHash prototypes and implementation
*/
#if defined (__cplusplus)
extern "C" {
#endif
/* ****************************
* INLINE mode
******************************/
/*!
* @defgroup public Public API
* Contains details on the public xxHash functions.
* @{
*/
#ifdef XXH_DOXYGEN
/*!
* @brief Exposes the implementation and marks all functions as `inline`.
*
* Use these build macros to inline xxhash into the target unit.
* Inlining improves performance on small inputs, especially when the length is
* expressed as a compile-time constant:
*
* https://fastcompression.blogspot.com/2018/03/xxhash-for-small-keys-impressive-power.html
*
* It also keeps xxHash symbols private to the unit, so they are not exported.
*
* Usage:
* @code{.c}
* #define XXH_INLINE_ALL
* #include "xxhash.h"
* @endcode
* Do not compile and link xxhash.o as a separate object, as it is not useful.
*/
# define XXH_INLINE_ALL
# undef XXH_INLINE_ALL
/*!
* @brief Exposes the implementation without marking functions as inline.
*/
# define XXH_PRIVATE_API
# undef XXH_PRIVATE_API
/*!
* @brief Emulate a namespace by transparently prefixing all symbols.
*
* If you want to include _and expose_ xxHash functions from within your own
* library, but also want to avoid symbol collisions with other libraries which
* may also include xxHash, you can use @ref XXH_NAMESPACE to automatically prefix
* any public symbol from xxhash library with the value of @ref XXH_NAMESPACE
* (therefore, avoid empty or numeric values).
*
* Note that no change is required within the calling program as long as it
* includes `xxhash.h`: Regular symbol names will be automatically translated
* by this header.
*/
# define XXH_NAMESPACE /* YOUR NAME HERE */
# undef XXH_NAMESPACE
#endif
#if (defined(XXH_INLINE_ALL) || defined(XXH_PRIVATE_API)) \
&& !defined(XXH_INLINE_ALL_31684351384)
/* this section should be traversed only once */
# define XXH_INLINE_ALL_31684351384
/* give access to the advanced API, required to compile implementations */
# undef XXH_STATIC_LINKING_ONLY /* avoid macro redef */
# define XXH_STATIC_LINKING_ONLY
/* make all functions private */
# undef XXH_PUBLIC_API
# if defined(__GNUC__)
# define XXH_PUBLIC_API static __inline __attribute__((unused))
# elif defined (__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */)
# define XXH_PUBLIC_API static inline
# elif defined(_MSC_VER)
# define XXH_PUBLIC_API static __inline
# else
/* note: this version may generate warnings for unused static functions */
# define XXH_PUBLIC_API static
# endif
/*
* This part deals with the special case where a unit wants to inline xxHash,
* but "xxhash.h" has previously been included without XXH_INLINE_ALL,
* such as part of some previously included *.h header file.
* Without further action, the new include would just be ignored,
* and functions would effectively _not_ be inlined (silent failure).
* The following macros solve this situation by prefixing all inlined names,
* avoiding naming collision with previous inclusions.
*/
/* Before that, we unconditionally #undef all symbols,
* in case they were already defined with XXH_NAMESPACE.
* They will then be redefined for XXH_INLINE_ALL
*/
# undef XXH_versionNumber
/* XXH32 */
# undef XXH32
# undef XXH32_createState
# undef XXH32_freeState
# undef XXH32_reset
# undef XXH32_update
# undef XXH32_digest
# undef XXH32_copyState
# undef XXH32_canonicalFromHash
# undef XXH32_hashFromCanonical
/* XXH64 */
# undef XXH64
# undef XXH64_createState
# undef XXH64_freeState
# undef XXH64_reset
# undef XXH64_update
# undef XXH64_digest
# undef XXH64_copyState
# undef XXH64_canonicalFromHash
# undef XXH64_hashFromCanonical
/* XXH3_64bits */
# undef XXH3_64bits
# undef XXH3_64bits_withSecret
# undef XXH3_64bits_withSeed
# undef XXH3_64bits_withSecretandSeed
# undef XXH3_createState
# undef XXH3_freeState
# undef XXH3_copyState
# undef XXH3_64bits_reset
# undef XXH3_64bits_reset_withSeed
# undef XXH3_64bits_reset_withSecret
# undef XXH3_64bits_update
# undef XXH3_64bits_digest
# undef XXH3_generateSecret
/* XXH3_128bits */
# undef XXH128
# undef XXH3_128bits
# undef XXH3_128bits_withSeed
# undef XXH3_128bits_withSecret
# undef XXH3_128bits_reset
# undef XXH3_128bits_reset_withSeed
# undef XXH3_128bits_reset_withSecret
# undef XXH3_128bits_reset_withSecretandSeed
# undef XXH3_128bits_update
# undef XXH3_128bits_digest
# undef XXH128_isEqual
# undef XXH128_cmp
# undef XXH128_canonicalFromHash
# undef XXH128_hashFromCanonical
/* Finally, free the namespace itself */
# undef XXH_NAMESPACE
/* employ the namespace for XXH_INLINE_ALL */
# define XXH_NAMESPACE XXH_INLINE_
/*
* Some identifiers (enums, type names) are not symbols,
* but they must nonetheless be renamed to avoid redeclaration.
* Alternative solution: do not redeclare them.
* However, this requires some #ifdefs, and has a more dispersed impact.
* Meanwhile, renaming can be achieved in a single place.
*/
# define XXH_IPREF(Id) XXH_NAMESPACE ## Id
# define XXH_OK XXH_IPREF(XXH_OK)
# define XXH_ERROR XXH_IPREF(XXH_ERROR)
# define XXH_errorcode XXH_IPREF(XXH_errorcode)
# define XXH32_canonical_t XXH_IPREF(XXH32_canonical_t)
# define XXH64_canonical_t XXH_IPREF(XXH64_canonical_t)
# define XXH128_canonical_t XXH_IPREF(XXH128_canonical_t)
# define XXH32_state_s XXH_IPREF(XXH32_state_s)
# define XXH32_state_t XXH_IPREF(XXH32_state_t)
# define XXH64_state_s XXH_IPREF(XXH64_state_s)
# define XXH64_state_t XXH_IPREF(XXH64_state_t)
# define XXH3_state_s XXH_IPREF(XXH3_state_s)
# define XXH3_state_t XXH_IPREF(XXH3_state_t)
# define XXH128_hash_t XXH_IPREF(XXH128_hash_t)
/* Ensure the header is parsed again, even if it was previously included */
# undef XXHASH_H_5627135585666179
# undef XXHASH_H_STATIC_13879238742
#endif /* XXH_INLINE_ALL || XXH_PRIVATE_API */
/* ****************************************************************
* Stable API
*****************************************************************/
#ifndef XXHASH_H_5627135585666179
#define XXHASH_H_5627135585666179 1
/*! @brief Marks a global symbol. */
#if !defined(XXH_INLINE_ALL) && !defined(XXH_PRIVATE_API)
# if defined(WIN32) && defined(_MSC_VER) && (defined(XXH_IMPORT) || defined(XXH_EXPORT))
# ifdef XXH_EXPORT
# define XXH_PUBLIC_API __declspec(dllexport)
# elif XXH_IMPORT
# define XXH_PUBLIC_API __declspec(dllimport)
# endif
# else
# define XXH_PUBLIC_API /* do nothing */
# endif
#endif
#ifdef XXH_NAMESPACE
# define XXH_CAT(A,B) A##B
# define XXH_NAME2(A,B) XXH_CAT(A,B)
# define XXH_versionNumber XXH_NAME2(XXH_NAMESPACE, XXH_versionNumber)
/* XXH32 */
# define XXH32 XXH_NAME2(XXH_NAMESPACE, XXH32)
# define XXH32_createState XXH_NAME2(XXH_NAMESPACE, XXH32_createState)
# define XXH32_freeState XXH_NAME2(XXH_NAMESPACE, XXH32_freeState)
# define XXH32_reset XXH_NAME2(XXH_NAMESPACE, XXH32_reset)
# define XXH32_update XXH_NAME2(XXH_NAMESPACE, XXH32_update)
# define XXH32_digest XXH_NAME2(XXH_NAMESPACE, XXH32_digest)
# define XXH32_copyState XXH_NAME2(XXH_NAMESPACE, XXH32_copyState)
# define XXH32_canonicalFromHash XXH_NAME2(XXH_NAMESPACE, XXH32_canonicalFromHash)
# define XXH32_hashFromCanonical XXH_NAME2(XXH_NAMESPACE, XXH32_hashFromCanonical)
/* XXH64 */
# define XXH64 XXH_NAME2(XXH_NAMESPACE, XXH64)
# define XXH64_createState XXH_NAME2(XXH_NAMESPACE, XXH64_createState)
# define XXH64_freeState XXH_NAME2(XXH_NAMESPACE, XXH64_freeState)
# define XXH64_reset XXH_NAME2(XXH_NAMESPACE, XXH64_reset)
# define XXH64_update XXH_NAME2(XXH_NAMESPACE, XXH64_update)
# define XXH64_digest XXH_NAME2(XXH_NAMESPACE, XXH64_digest)
# define XXH64_copyState XXH_NAME2(XXH_NAMESPACE, XXH64_copyState)
# define XXH64_canonicalFromHash XXH_NAME2(XXH_NAMESPACE, XXH64_canonicalFromHash)
# define XXH64_hashFromCanonical XXH_NAME2(XXH_NAMESPACE, XXH64_hashFromCanonical)
/* XXH3_64bits */
# define XXH3_64bits XXH_NAME2(XXH_NAMESPACE, XXH3_64bits)
# define XXH3_64bits_withSecret XXH_NAME2(XXH_NAMESPACE, XXH3_64bits_withSecret)
# define XXH3_64bits_withSeed XXH_NAME2(XXH_NAMESPACE, XXH3_64bits_withSeed)
# define XXH3_64bits_withSecretandSeed XXH_NAME2(XXH_NAMESPACE, XXH3_64bits_withSecretandSeed)
# define XXH3_createState XXH_NAME2(XXH_NAMESPACE, XXH3_createState)
# define XXH3_freeState XXH_NAME2(XXH_NAMESPACE, XXH3_freeState)
# define XXH3_copyState XXH_NAME2(XXH_NAMESPACE, XXH3_copyState)
# define XXH3_64bits_reset XXH_NAME2(XXH_NAMESPACE, XXH3_64bits_reset)
# define XXH3_64bits_reset_withSeed XXH_NAME2(XXH_NAMESPACE, XXH3_64bits_reset_withSeed)
# define XXH3_64bits_reset_withSecret XXH_NAME2(XXH_NAMESPACE, XXH3_64bits_reset_withSecret)
# define XXH3_64bits_reset_withSecretandSeed XXH_NAME2(XXH_NAMESPACE, XXH3_64bits_reset_withSecretandSeed)
# define XXH3_64bits_update XXH_NAME2(XXH_NAMESPACE, XXH3_64bits_update)
# define XXH3_64bits_digest XXH_NAME2(XXH_NAMESPACE, XXH3_64bits_digest)
# define XXH3_generateSecret XXH_NAME2(XXH_NAMESPACE, XXH3_generateSecret)
# define XXH3_generateSecret_fromSeed XXH_NAME2(XXH_NAMESPACE, XXH3_generateSecret_fromSeed)
/* XXH3_128bits */
# define XXH128 XXH_NAME2(XXH_NAMESPACE, XXH128)
# define XXH3_128bits XXH_NAME2(XXH_NAMESPACE, XXH3_128bits)
# define XXH3_128bits_withSeed XXH_NAME2(XXH_NAMESPACE, XXH3_128bits_withSeed)
# define XXH3_128bits_withSecret XXH_NAME2(XXH_NAMESPACE, XXH3_128bits_withSecret)
# define XXH3_128bits_withSecretandSeed XXH_NAME2(XXH_NAMESPACE, XXH3_128bits_withSecretandSeed)
# define XXH3_128bits_reset XXH_NAME2(XXH_NAMESPACE, XXH3_128bits_reset)
# define XXH3_128bits_reset_withSeed XXH_NAME2(XXH_NAMESPACE, XXH3_128bits_reset_withSeed)
# define XXH3_128bits_reset_withSecret XXH_NAME2(XXH_NAMESPACE, XXH3_128bits_reset_withSecret)
# define XXH3_128bits_reset_withSecretandSeed XXH_NAME2(XXH_NAMESPACE, XXH3_128bits_reset_withSecretandSeed)
# define XXH3_128bits_update XXH_NAME2(XXH_NAMESPACE, XXH3_128bits_update)
# define XXH3_128bits_digest XXH_NAME2(XXH_NAMESPACE, XXH3_128bits_digest)
# define XXH128_isEqual XXH_NAME2(XXH_NAMESPACE, XXH128_isEqual)
# define XXH128_cmp XXH_NAME2(XXH_NAMESPACE, XXH128_cmp)
# define XXH128_canonicalFromHash XXH_NAME2(XXH_NAMESPACE, XXH128_canonicalFromHash)
# define XXH128_hashFromCanonical XXH_NAME2(XXH_NAMESPACE, XXH128_hashFromCanonical)
#endif
/* *************************************
* Compiler specifics
***************************************/
/* specific declaration modes for Windows */
#if !defined(XXH_INLINE_ALL) && !defined(XXH_PRIVATE_API)
# if defined(WIN32) && defined(_MSC_VER) && (defined(XXH_IMPORT) || defined(XXH_EXPORT))
# ifdef XXH_EXPORT
# define XXH_PUBLIC_API __declspec(dllexport)
# elif XXH_IMPORT
# define XXH_PUBLIC_API __declspec(dllimport)
# endif
# else
# define XXH_PUBLIC_API /* do nothing */
# endif
#endif
#if defined (__GNUC__)
# define XXH_CONSTF __attribute__((const))
# define XXH_PUREF __attribute__((pure))
# define XXH_MALLOCF __attribute__((malloc))
#else
# define XXH_CONSTF /* disable */
# define XXH_PUREF
# define XXH_MALLOCF
#endif
/* *************************************
* Version
***************************************/
#define XXH_VERSION_MAJOR 0
#define XXH_VERSION_MINOR 8
#define XXH_VERSION_RELEASE 1
/*! @brief Version number, encoded as two digits each */
#define XXH_VERSION_NUMBER (XXH_VERSION_MAJOR *100*100 + XXH_VERSION_MINOR *100 + XXH_VERSION_RELEASE)
/*!
* @brief Obtains the xxHash version.
*
* This is mostly useful when xxHash is compiled as a shared library,
* since the returned value comes from the library, as opposed to header file.
*
* @return @ref XXH_VERSION_NUMBER of the invoked library.
*/
XXH_PUBLIC_API XXH_CONSTF unsigned XXH_versionNumber (void);
/* ****************************
* Common basic types
******************************/
#include <stddef.h> /* size_t */
/*!
* @brief Exit code for the streaming API.
*/
typedef enum {
XXH_OK = 0, /*!< OK */
XXH_ERROR /*!< Error */
} XXH_errorcode;
/*-**********************************************************************
* 32-bit hash
************************************************************************/
#if defined(XXH_DOXYGEN) /* Don't show <stdint.h> include */
/*!
* @brief An unsigned 32-bit integer.
*
* Not necessarily defined to `uint32_t` but functionally equivalent.
*/
typedef uint32_t XXH32_hash_t;
#elif !defined (__VMS) \
&& (defined (__cplusplus) \
|| (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */) )
# include <stdint.h>
typedef uint32_t XXH32_hash_t;
#else
# include <limits.h>
# if UINT_MAX == 0xFFFFFFFFUL
typedef unsigned int XXH32_hash_t;
# elif ULONG_MAX == 0xFFFFFFFFUL
typedef unsigned long XXH32_hash_t;
# else
# error "unsupported platform: need a 32-bit type"
# endif
#endif
/*!
* @}
*
* @defgroup XXH32_family XXH32 family
* @ingroup public
* Contains functions used in the classic 32-bit xxHash algorithm.
*
* @note
* XXH32 is useful for older platforms, with no or poor 64-bit performance.
* Note that the @ref XXH3_family provides competitive speed for both 32-bit
* and 64-bit systems, and offers true 64/128 bit hash results.
*
* @see @ref XXH64_family, @ref XXH3_family : Other xxHash families
* @see @ref XXH32_impl for implementation details
* @{
*/
/*!
* @brief Calculates the 32-bit hash of @p input using xxHash32.
*
* Speed on Core 2 Duo @ 3 GHz (single thread, SMHasher benchmark): 5.4 GB/s
*
* See @ref single_shot_example "Single Shot Example" for an example.
*
* @param input The block of data to be hashed, at least @p length bytes in size.
* @param length The length of @p input, in bytes.
* @param seed The 32-bit seed to alter the hash's output predictably.
*
* @pre
* The memory between @p input and @p input + @p length must be valid,
* readable, contiguous memory. However, if @p length is `0`, @p input may be
* `NULL`. In C++, this also must be *TriviallyCopyable*.
*
* @return The calculated 32-bit hash value.
*
* @see
* XXH64(), XXH3_64bits_withSeed(), XXH3_128bits_withSeed(), XXH128():
* Direct equivalents for the other variants of xxHash.
* @see
* XXH32_createState(), XXH32_update(), XXH32_digest(): Streaming version.
*/
XXH_PUBLIC_API XXH_PUREF XXH32_hash_t XXH32 (const void* input, size_t length, XXH32_hash_t seed);
#ifndef XXH_NO_STREAM
/*!
* Streaming functions generate the xxHash value from an incremental input.
* This method is slower than single-call functions, due to state management.
* For small inputs, prefer `XXH32()` and `XXH64()`, which are better optimized.
*
* An XXH state must first be allocated using `XXH*_createState()`.
*
* Start a new hash by initializing the state with a seed using `XXH*_reset()`.
*
* Then, feed the hash state by calling `XXH*_update()` as many times as necessary.
*
* The function returns an error code, with 0 meaning OK, and any other value
* meaning there is an error.
*
* Finally, a hash value can be produced anytime, by using `XXH*_digest()`.
* This function returns the nn-bits hash as an int or long long.
*
* It's still possible to continue inserting input into the hash state after a
* digest, and generate new hash values later on by invoking `XXH*_digest()`.
*
* When done, release the state using `XXH*_freeState()`.
*
* @see streaming_example at the top of @ref xxhash.h for an example.
*/
/*!
* @typedef struct XXH32_state_s XXH32_state_t
* @brief The opaque state struct for the XXH32 streaming API.
*
* @see XXH32_state_s for details.
*/
typedef struct XXH32_state_s XXH32_state_t;
/*!
* @brief Allocates an @ref XXH32_state_t.
*
* Must be freed with XXH32_freeState().
* @return An allocated XXH32_state_t on success, `NULL` on failure.
*/
XXH_PUBLIC_API XXH_MALLOCF XXH32_state_t* XXH32_createState(void);
/*!
* @brief Frees an @ref XXH32_state_t.
*
* Must be allocated with XXH32_createState().
* @param statePtr A pointer to an @ref XXH32_state_t allocated with @ref XXH32_createState().
* @return XXH_OK.
*/
XXH_PUBLIC_API XXH_errorcode XXH32_freeState(XXH32_state_t* statePtr);
/*!
* @brief Copies one @ref XXH32_state_t to another.
*
* @param dst_state The state to copy to.
* @param src_state The state to copy from.
* @pre
* @p dst_state and @p src_state must not be `NULL` and must not overlap.
*/
XXH_PUBLIC_API void XXH32_copyState(XXH32_state_t* dst_state, const XXH32_state_t* src_state);
/*!
* @brief Resets an @ref XXH32_state_t to begin a new hash.
*
* This function resets and seeds a state. Call it before @ref XXH32_update().
*
* @param statePtr The state struct to reset.
* @param seed The 32-bit seed to alter the hash result predictably.
*
* @pre
* @p statePtr must not be `NULL`.
*
* @return @ref XXH_OK on success, @ref XXH_ERROR on failure.
*/
XXH_PUBLIC_API XXH_errorcode XXH32_reset (XXH32_state_t* statePtr, XXH32_hash_t seed);
/*!
* @brief Consumes a block of @p input to an @ref XXH32_state_t.
*
* Call this to incrementally consume blocks of data.
*
* @param statePtr The state struct to update.
* @param input The block of data to be hashed, at least @p length bytes in size.
* @param length The length of @p input, in bytes.
*
* @pre
* @p statePtr must not be `NULL`.
* @pre
* The memory between @p input and @p input + @p length must be valid,
* readable, contiguous memory. However, if @p length is `0`, @p input may be
* `NULL`. In C++, this also must be *TriviallyCopyable*.
*
* @return @ref XXH_OK on success, @ref XXH_ERROR on failure.
*/
XXH_PUBLIC_API XXH_errorcode XXH32_update (XXH32_state_t* statePtr, const void* input, size_t length);
/*!
* @brief Returns the calculated hash value from an @ref XXH32_state_t.
*
* @note
* Calling XXH32_digest() will not affect @p statePtr, so you can update,
* digest, and update again.
*
* @param statePtr The state struct to calculate the hash from.
*
* @pre
* @p statePtr must not be `NULL`.
*
* @return The calculated xxHash32 value from that state.
*/
XXH_PUBLIC_API XXH_PUREF XXH32_hash_t XXH32_digest (const XXH32_state_t* statePtr);
#endif /* !XXH_NO_STREAM */
/******* Canonical representation *******/
/*
* The default return values from XXH functions are unsigned 32 and 64 bit
* integers.
* This the simplest and fastest format for further post-processing.
*
* However, this leaves open the question of what is the order on the byte level,
* since little and big endian conventions will store the same number differently.
*
* The canonical representation settles this issue by mandating big-endian
* convention, the same convention as human-readable numbers (large digits first).
*
* When writing hash values to storage, sending them over a network, or printing
* them, it's highly recommended to use the canonical representation to ensure
* portability across a wider range of systems, present and future.
*
* The following functions allow transformation of hash values to and from
* canonical format.
*/
/*!
* @brief Canonical (big endian) representation of @ref XXH32_hash_t.
*/
typedef struct {
unsigned char digest[4]; /*!< Hash bytes, big endian */
} XXH32_canonical_t;
/*!
* @brief Converts an @ref XXH32_hash_t to a big endian @ref XXH32_canonical_t.
*
* @param dst The @ref XXH32_canonical_t pointer to be stored to.
* @param hash The @ref XXH32_hash_t to be converted.
*
* @pre
* @p dst must not be `NULL`.
*/
XXH_PUBLIC_API void XXH32_canonicalFromHash(XXH32_canonical_t* dst, XXH32_hash_t hash);
/*!
* @brief Converts an @ref XXH32_canonical_t to a native @ref XXH32_hash_t.
*
* @param src The @ref XXH32_canonical_t to convert.
*
* @pre
* @p src must not be `NULL`.
*
* @return The converted hash.
*/
XXH_PUBLIC_API XXH_PUREF XXH32_hash_t XXH32_hashFromCanonical(const XXH32_canonical_t* src);
#ifdef __has_attribute
# define XXH_HAS_ATTRIBUTE(x) __has_attribute(x)
#else
# define XXH_HAS_ATTRIBUTE(x) 0
#endif
/* C-language Attributes are added in C23. */
#if defined(__STDC_VERSION__) && (__STDC_VERSION__ > 201710L) && defined(__has_c_attribute)
# define XXH_HAS_C_ATTRIBUTE(x) __has_c_attribute(x)
#else
# define XXH_HAS_C_ATTRIBUTE(x) 0
#endif
#if defined(__cplusplus) && defined(__has_cpp_attribute)
# define XXH_HAS_CPP_ATTRIBUTE(x) __has_cpp_attribute(x)
#else
# define XXH_HAS_CPP_ATTRIBUTE(x) 0
#endif
/*
* Define XXH_FALLTHROUGH macro for annotating switch case with the 'fallthrough' attribute
* introduced in CPP17 and C23.
* CPP17 : https://en.cppreference.com/w/cpp/language/attributes/fallthrough
* C23 : https://en.cppreference.com/w/c/language/attributes/fallthrough
*/
#if XXH_HAS_C_ATTRIBUTE(fallthrough) || XXH_HAS_CPP_ATTRIBUTE(fallthrough)
# define XXH_FALLTHROUGH [[fallthrough]]
#elif XXH_HAS_ATTRIBUTE(__fallthrough__)
# define XXH_FALLTHROUGH __attribute__ ((__fallthrough__))
#else
# define XXH_FALLTHROUGH /* fallthrough */
#endif
/*!
* @}
* @ingroup public
* @{
*/
#ifndef XXH_NO_LONG_LONG
/*-**********************************************************************
* 64-bit hash
************************************************************************/
#if defined(XXH_DOXYGEN) /* don't include <stdint.h> */
/*!
* @brief An unsigned 64-bit integer.
*
* Not necessarily defined to `uint64_t` but functionally equivalent.
*/
typedef uint64_t XXH64_hash_t;
#elif !defined (__VMS) \
&& (defined (__cplusplus) \
|| (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */) )
# include <stdint.h>
typedef uint64_t XXH64_hash_t;
#else
# include <limits.h>
# if defined(__LP64__) && ULONG_MAX == 0xFFFFFFFFFFFFFFFFULL
/* LP64 ABI says uint64_t is unsigned long */
typedef unsigned long XXH64_hash_t;
# else
/* the following type must have a width of 64-bit */
typedef unsigned long long XXH64_hash_t;
# endif
#endif
/*!
* @}
*
* @defgroup XXH64_family XXH64 family
* @ingroup public
* @{
* Contains functions used in the classic 64-bit xxHash algorithm.
*
* @note
* XXH3 provides competitive speed for both 32-bit and 64-bit systems,
* and offers true 64/128 bit hash results.
* It provides better speed for systems with vector processing capabilities.
*/
/*!
* @brief Calculates the 64-bit hash of @p input using xxHash64.
*
* This function usually runs faster on 64-bit systems, but slower on 32-bit
* systems (see benchmark).
*
* @param input The block of data to be hashed, at least @p length bytes in size.
* @param length The length of @p input, in bytes.
* @param seed The 64-bit seed to alter the hash's output predictably.
*
* @pre
* The memory between @p input and @p input + @p length must be valid,
* readable, contiguous memory. However, if @p length is `0`, @p input may be
* `NULL`. In C++, this also must be *TriviallyCopyable*.
*
* @return The calculated 64-bit hash.
*
* @see
* XXH32(), XXH3_64bits_withSeed(), XXH3_128bits_withSeed(), XXH128():
* Direct equivalents for the other variants of xxHash.
* @see
* XXH64_createState(), XXH64_update(), XXH64_digest(): Streaming version.
*/
XXH_PUBLIC_API XXH_PUREF XXH64_hash_t XXH64(const void* input, size_t length, XXH64_hash_t seed);
/******* Streaming *******/
#ifndef XXH_NO_STREAM
/*!
* @brief The opaque state struct for the XXH64 streaming API.
*
* @see XXH64_state_s for details.
*/
typedef struct XXH64_state_s XXH64_state_t; /* incomplete type */
XXH_PUBLIC_API XXH_MALLOCF XXH64_state_t* XXH64_createState(void);
XXH_PUBLIC_API XXH_errorcode XXH64_freeState(XXH64_state_t* statePtr);
XXH_PUBLIC_API void XXH64_copyState(XXH64_state_t* dst_state, const XXH64_state_t* src_state);
XXH_PUBLIC_API XXH_errorcode XXH64_reset (XXH64_state_t* statePtr, XXH64_hash_t seed);
XXH_PUBLIC_API XXH_errorcode XXH64_update (XXH64_state_t* statePtr, const void* input, size_t length);
XXH_PUBLIC_API XXH_PUREF XXH64_hash_t XXH64_digest (const XXH64_state_t* statePtr);
#endif /* !XXH_NO_STREAM */
/******* Canonical representation *******/
typedef struct { unsigned char digest[sizeof(XXH64_hash_t)]; } XXH64_canonical_t;
XXH_PUBLIC_API void XXH64_canonicalFromHash(XXH64_canonical_t* dst, XXH64_hash_t hash);
XXH_PUBLIC_API XXH_PUREF XXH64_hash_t XXH64_hashFromCanonical(const XXH64_canonical_t* src);
#ifndef XXH_NO_XXH3
/*!
* @}
* ************************************************************************
* @defgroup XXH3_family XXH3 family
* @ingroup public
* @{
*
* XXH3 is a more recent hash algorithm featuring:
* - Improved speed for both small and large inputs
* - True 64-bit and 128-bit outputs
* - SIMD acceleration
* - Improved 32-bit viability
*
* Speed analysis methodology is explained here:
*
* https://fastcompression.blogspot.com/2019/03/presenting-xxh3.html
*
* Compared to XXH64, expect XXH3 to run approximately
* ~2x faster on large inputs and >3x faster on small ones,
* exact differences vary depending on platform.
*
* XXH3's speed benefits greatly from SIMD and 64-bit arithmetic,
* but does not require it.
* Most 32-bit and 64-bit targets that can run XXH32 smoothly can run XXH3
* at competitive speeds, even without vector support. Further details are
* explained in the implementation.
*
* Optimized implementations are provided for AVX512, AVX2, SSE2, NEON, POWER8,
* ZVector and scalar targets. This can be controlled via the @ref XXH_VECTOR
* macro. For the x86 family, an automatic dispatcher is included separately
* in @ref xxh_x86dispatch.c.
*
* XXH3 implementation is portable:
* it has a generic C90 formulation that can be compiled on any platform,
* all implementations generage exactly the same hash value on all platforms.
* Starting from v0.8.0, it's also labelled "stable", meaning that
* any future version will also generate the same hash value.
*
* XXH3 offers 2 variants, _64bits and _128bits.
*
* When only 64 bits are needed, prefer invoking the _64bits variant, as it
* reduces the amount of mixing, resulting in faster speed on small inputs.
* It's also generally simpler to manipulate a scalar return type than a struct.
*
* The API supports one-shot hashing, streaming mode, and custom secrets.
*/
/*-**********************************************************************
* XXH3 64-bit variant
************************************************************************/
/*!
* @brief 64-bit unseeded variant of XXH3.
*
* This is equivalent to @ref XXH3_64bits_withSeed() with a seed of 0, however
* it may have slightly better performance due to constant propagation of the
* defaults.
*
* @see
* XXH32(), XXH64(), XXH3_128bits(): equivalent for the other xxHash algorithms
* @see
* XXH3_64bits_withSeed(), XXH3_64bits_withSecret(): other seeding variants
* @see
* XXH3_64bits_reset(), XXH3_64bits_update(), XXH3_64bits_digest(): Streaming version.
*/
XXH_PUBLIC_API XXH_PUREF XXH64_hash_t XXH3_64bits(const void* input, size_t length);
/*!
* @brief 64-bit seeded variant of XXH3
*
* This variant generates a custom secret on the fly based on default secret
* altered using the `seed` value.
*
* While this operation is decently fast, note that it's not completely free.
*
* @note
* seed == 0 produces the same results as @ref XXH3_64bits().
*
* @param input The data to hash
* @param length The length
* @param seed The 64-bit seed to alter the state.
*/
XXH_PUBLIC_API XXH_PUREF XXH64_hash_t XXH3_64bits_withSeed(const void* input, size_t length, XXH64_hash_t seed);
/*!
* The bare minimum size for a custom secret.
*
* @see
* XXH3_64bits_withSecret(), XXH3_64bits_reset_withSecret(),
* XXH3_128bits_withSecret(), XXH3_128bits_reset_withSecret().
*/
#define XXH3_SECRET_SIZE_MIN 136
/*!
* @brief 64-bit variant of XXH3 with a custom "secret".
*
* It's possible to provide any blob of bytes as a "secret" to generate the hash.
* This makes it more difficult for an external actor to prepare an intentional collision.
* The main condition is that secretSize *must* be large enough (>= XXH3_SECRET_SIZE_MIN).
* However, the quality of the secret impacts the dispersion of the hash algorithm.
* Therefore, the secret _must_ look like a bunch of random bytes.
* Avoid "trivial" or structured data such as repeated sequences or a text document.
* Whenever in doubt about the "randomness" of the blob of bytes,
* consider employing "XXH3_generateSecret()" instead (see below).
* It will generate a proper high entropy secret derived from the blob of bytes.
* Another advantage of using XXH3_generateSecret() is that
* it guarantees that all bits within the initial blob of bytes
* will impact every bit of the output.
* This is not necessarily the case when using the blob of bytes directly
* because, when hashing _small_ inputs, only a portion of the secret is employed.
*/
XXH_PUBLIC_API XXH_PUREF XXH64_hash_t XXH3_64bits_withSecret(const void* data, size_t len, const void* secret, size_t secretSize);
/******* Streaming *******/
#ifndef XXH_NO_STREAM
/*
* Streaming requires state maintenance.
* This operation costs memory and CPU.
* As a consequence, streaming is slower than one-shot hashing.
* For better performance, prefer one-shot functions whenever applicable.
*/
/*!
* @brief The state struct for the XXH3 streaming API.
*
* @see XXH3_state_s for details.
*/
typedef struct XXH3_state_s XXH3_state_t;
XXH_PUBLIC_API XXH_MALLOCF XXH3_state_t* XXH3_createState(void);
XXH_PUBLIC_API XXH_errorcode XXH3_freeState(XXH3_state_t* statePtr);
XXH_PUBLIC_API void XXH3_copyState(XXH3_state_t* dst_state, const XXH3_state_t* src_state);
/*
* XXH3_64bits_reset():
* Initialize with default parameters.
* digest will be equivalent to `XXH3_64bits()`.
*/
XXH_PUBLIC_API XXH_errorcode XXH3_64bits_reset(XXH3_state_t* statePtr);
/*
* XXH3_64bits_reset_withSeed():
* Generate a custom secret from `seed`, and store it into `statePtr`.
* digest will be equivalent to `XXH3_64bits_withSeed()`.
*/
XXH_PUBLIC_API XXH_errorcode XXH3_64bits_reset_withSeed(XXH3_state_t* statePtr, XXH64_hash_t seed);
/*!
* XXH3_64bits_reset_withSecret():
* `secret` is referenced, it _must outlive_ the hash streaming session.
* Similar to one-shot API, `secretSize` must be >= `XXH3_SECRET_SIZE_MIN`,
* and the quality of produced hash values depends on secret's entropy
* (secret's content should look like a bunch of random bytes).
* When in doubt about the randomness of a candidate `secret`,
* consider employing `XXH3_generateSecret()` instead (see below).
*/
XXH_PUBLIC_API XXH_errorcode XXH3_64bits_reset_withSecret(XXH3_state_t* statePtr, const void* secret, size_t secretSize);
XXH_PUBLIC_API XXH_errorcode XXH3_64bits_update (XXH3_state_t* statePtr, const void* input, size_t length);
XXH_PUBLIC_API XXH_PUREF XXH64_hash_t XXH3_64bits_digest (const XXH3_state_t* statePtr);
#endif /* !XXH_NO_STREAM */
/* note : canonical representation of XXH3 is the same as XXH64