mirror of
https://github.com/stefanocasazza/ULib.git
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87 lines
3.6 KiB
C
87 lines
3.6 KiB
C
/** ============================================================================
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//
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// = LIBRARY
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// ULib - c library
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//
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// = FILENAME
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// hash.h
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//
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// = AUTHOR
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// Stefano Casazza
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//
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// ============================================================================ */
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#ifndef ULIB_BASE_HASH_H
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#define ULIB_BASE_HASH_H 1
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#include <ulib/base/base.h>
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#define U_hash_size(n) (1U<<(n))
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#define U_hash_mask(n) (U_hash_size(n)-1U)
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/* get next prime number for container */
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#define U_GET_NEXT_PRIME_NUMBER(sz) ((sz) <= 53U ? 97U : \
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(sz) <= 97U ? 193U : \
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(sz) <= 193U ? 389U : \
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(sz) <= 389U ? 769U : \
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(sz) <= 769U ? 1543U : \
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(sz) <= 1543U ? 3079U : \
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(sz) <= 3079U ? 6151U : \
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(sz) <= 6151U ? 12289U : \
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(sz) <= 12289U ? 24593U : \
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(sz) <= 24593U ? 49157U : \
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(sz) <= 49157U ? 98317U : \
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(sz) <= 98317U ? 196613U : \
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(sz) <= 196613U ? 393241U : \
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(sz) <= 393241U ? 786433U : \
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(sz) <= 786433U ? 1572869U : \
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(sz) <= 1572869U ? 3145739U : \
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(sz) <= 3145739U ? 6291469U : \
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(sz) <= 6291469U ? 12582917U : \
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(sz) <= 12582917U ? 25165843U : \
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(sz) <= 25165843U ? 50331653U : \
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(sz) <= 50331653U ? 100663319U : \
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(sz) <= 100663319U ? 201326611U : \
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(sz) <= 201326611U ? 402653189U : \
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(sz) <= 402653189U ? 805306457U : \
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(sz) <= 805306457U ? 805306457U : \
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(sz) <= 1610612741U ? 3221225473U : 4294967291U)
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#ifdef __cplusplus
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extern "C" {
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#endif
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U_EXPORT uint32_t u_random( uint32_t val) __pure; /* quick 4byte hashing function */
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#ifdef HAVE_ARCH64
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U_EXPORT uint32_t u_random64(uint64_t ptr) __pure;
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#endif
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static inline double u_randomd(uint32_t a) { return (1.0/4294967296.0) * u_random(a); } /* Map hash value into number 0.0 <= n < 1.0 */
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/* hash variable-length key into 32-bit value */
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U_EXPORT uint32_t murmurhash3_x86_32_ignore_case(unsigned char* restrict t, uint32_t tlen) __pure;
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U_EXPORT uint32_t u_cdb_hash( unsigned char* restrict t, uint32_t tlen, int flags) __pure;
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static inline uint32_t u_hash_ignore_case(unsigned char* restrict t, uint32_t tlen) { return murmurhash3_x86_32_ignore_case(t, tlen); }
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#ifdef USE_HARDWARE_CRC32
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U_EXPORT uint32_t u_crc32(unsigned char* restrict t, uint32_t tlen) __pure;
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static inline uint32_t u_hash(unsigned char* restrict t, uint32_t tlen) { return u_crc32(t, tlen); }
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#else
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# ifndef HAVE_ARCH64
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U_EXPORT uint32_t u_hash(unsigned char* restrict t, uint32_t tlen) __pure;
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# else
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U_EXPORT uint32_t murmurhash3_x86_64(unsigned char* restrict t, uint32_t tlen) __pure;
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static inline uint32_t u_hash(unsigned char* restrict t, uint32_t tlen) { return murmurhash3_x86_64(t, tlen); }
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# endif
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif
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