Hasher.C File Reference

Hashing functions, mostly from Bob Jenkins. More...

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Macros
#define	bitRotateLeft(x, nBits)   (((x) << (nBits)) | ((x) >> (32 - (nBits))))
#define	bitMixer(a, b, c)
#define	bitMixerFinal(a, b, c)

Functions
static unsigned	jenkins_hashlittle (const void *key, size_t length, unsigned initval)
static unsigned	jenkins_hashbig (const void *key, size_t length, unsigned initval)

Detailed Description

Hashing functions, mostly from Bob Jenkins.

Original source file Hasher.C

Definition in file Hasher.C.

Macro Definition Documentation

bitRotateLeft

#define bitRotateLeft	(		x,
			nBits
	)		(((x) << (nBits)) | ((x) >> (32 - (nBits))))

Definition at line 36 of file Hasher.C.

bitMixer

#define bitMixer	(		a,
			b,
			c
	)

Value:

{                                                                          \
        a -= c; a ^= bitRotateLeft(c, 4); c += b;                              \
        b -= a; b ^= bitRotateLeft(a, 6); a += c;                              \
        c -= b; c ^= bitRotateLeft(b, 8); b += a;                              \
        a -= c; a ^= bitRotateLeft(c,16); c += b;                              \
        b -= a; b ^= bitRotateLeft(a,19); a += c;                              \
        c -= b; c ^= bitRotateLeft(b, 4); b += a;                              \
    }

Definition at line 116 of file Hasher.C.

Referenced by Foam::HasherDual(), Foam::HasherInt(), jenkins_hashbig(), and jenkins_hashlittle().

bitMixerFinal

#define bitMixerFinal	(		a,
			b,
			c
	)

Value:

{                                                                          \
        c ^= b; c -= bitRotateLeft(b, 14);                                     \
        a ^= c; a -= bitRotateLeft(c, 11);                                     \
        b ^= a; b -= bitRotateLeft(a, 25);                                     \
        c ^= b; c -= bitRotateLeft(b, 16);                                     \
        a ^= c; a -= bitRotateLeft(c, 4);                                      \
        b ^= a; b -= bitRotateLeft(a, 14);                                     \
        c ^= b; c -= bitRotateLeft(b, 24);                                     \
    }

Definition at line 151 of file Hasher.C.

Referenced by Foam::HasherDual(), Foam::HasherInt(), jenkins_hashbig(), and jenkins_hashlittle().

Function Documentation

jenkins_hashlittle()

static unsigned jenkins_hashlittle ( const void *  key, size_t  length, unsigned  initval  )

static

Definition at line 193 of file Hasher.C.

References Foam::constant::physicoChemical::b, bitMixer, bitMixerFinal, Foam::constant::universal::c, jenkins_hashbig(), and k.

Referenced by Foam::Hasher().

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jenkins_hashbig()

static unsigned jenkins_hashbig ( const void *  key, size_t  length, unsigned  initval  )

static

Definition at line 371 of file Hasher.C.

References Foam::constant::physicoChemical::b, bitMixer, bitMixerFinal, Foam::constant::universal::c, Foam::Hasher(), and k.

Referenced by Foam::Hasher(), and jenkins_hashlittle().

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