mirror of
https://github.com/nillerusr/source-engine.git
synced 2024-12-23 22:56:50 +00:00
430 lines
11 KiB
C++
430 lines
11 KiB
C++
|
//======= Copyright <20> 2005, , Valve Corporation, All rights reserved. =========
|
|||
|
|
//
|
|||
|
|
// Purpose: Variant Pearson Hash general purpose hashing algorithm described
|
|||
|
|
// by Cargill in C++ Report 1994. Generates a 16-bit result.
|
|||
|
|
//
|
|||
|
|
//=============================================================================
|
|||
|
|
|
|||
|
|
#include <stdlib.h>
|
|||
|
|
#include "tier0/basetypes.h"
|
|||
|
|
#include "tier0/platform.h"
|
|||
|
|
#include "generichash.h"
|
|||
|
|
#include <ctype.h>
|
|||
|
|
#include "tier0/dbg.h"
|
|||
|
|
|
|||
|
|
// NOTE: This has to be the last file included!
|
|||
|
|
#include "tier0/memdbgon.h"
|
|||
|
|
|
|||
|
|
|
|||
|
|
//-----------------------------------------------------------------------------
|
|||
|
|
//
|
|||
|
|
// Table of randomly shuffled values from 0-255 generated by:
|
|||
|
|
//
|
|||
|
|
//-----------------------------------------------------------------------------
|
|||
|
|
/*
|
|||
|
|
void MakeRandomValues()
|
|||
|
|
{
|
|||
|
|
int i, j, r;
|
|||
|
|
unsigned t;
|
|||
|
|
srand( 0xdeadbeef );
|
|||
|
|
|
|||
|
|
for ( i = 0; i < 256; i++ )
|
|||
|
|
{
|
|||
|
|
g_nRandomValues[i] = (unsigned )i;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
for (j = 0; j < 8; j++)
|
|||
|
|
{
|
|||
|
|
for (i = 0; i < 256; i++)
|
|||
|
|
{
|
|||
|
|
r = rand() & 0xff;
|
|||
|
|
t = g_nRandomValues[i];
|
|||
|
|
g_nRandomValues[i] = g_nRandomValues[r];
|
|||
|
|
g_nRandomValues[r] = t;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
printf("static unsigned g_nRandomValues[256] =\n{\n");
|
|||
|
|
|
|||
|
|
for (i = 0; i < 256; i += 16)
|
|||
|
|
{
|
|||
|
|
printf("\t");
|
|||
|
|
for (j = 0; j < 16; j++)
|
|||
|
|
printf(" %3d,", g_nRandomValues[i+j]);
|
|||
|
|
printf("\n");
|
|||
|
|
}
|
|||
|
|
printf("};\n");
|
|||
|
|
}
|
|||
|
|
*/
|
|||
|
|
|
|||
|
|
static unsigned g_nRandomValues[256] =
|
|||
|
|
{
|
|||
|
|
238, 164, 191, 168, 115, 16, 142, 11, 213, 214, 57, 151, 248, 252, 26, 198,
|
|||
|
|
13, 105, 102, 25, 43, 42, 227, 107, 210, 251, 86, 66, 83, 193, 126, 108,
|
|||
|
|
131, 3, 64, 186, 192, 81, 37, 158, 39, 244, 14, 254, 75, 30, 2, 88,
|
|||
|
|
172, 176, 255, 69, 0, 45, 116, 139, 23, 65, 183, 148, 33, 46, 203, 20,
|
|||
|
|
143, 205, 60, 197, 118, 9, 171, 51, 233, 135, 220, 49, 71, 184, 82, 109,
|
|||
|
|
36, 161, 169, 150, 63, 96, 173, 125, 113, 67, 224, 78, 232, 215, 35, 219,
|
|||
|
|
79, 181, 41, 229, 149, 153, 111, 217, 21, 72, 120, 163, 133, 40, 122, 140,
|
|||
|
|
208, 231, 211, 200, 160, 182, 104, 110, 178, 237, 15, 101, 27, 50, 24, 189,
|
|||
|
|
177, 130, 187, 92, 253, 136, 100, 212, 19, 174, 70, 22, 170, 206, 162, 74,
|
|||
|
|
247, 5, 47, 32, 179, 117, 132, 195, 124, 123, 245, 128, 236, 223, 12, 84,
|
|||
|
|
54, 218, 146, 228, 157, 94, 106, 31, 17, 29, 194, 34, 56, 134, 239, 246,
|
|||
|
|
241, 216, 127, 98, 7, 204, 154, 152, 209, 188, 48, 61, 87, 97, 225, 85,
|
|||
|
|
90, 167, 155, 112, 145, 114, 141, 93, 250, 4, 201, 156, 38, 89, 226, 196,
|
|||
|
|
1, 235, 44, 180, 159, 121, 119, 166, 190, 144, 10, 91, 76, 230, 221, 80,
|
|||
|
|
207, 55, 58, 53, 175, 8, 6, 52, 68, 242, 18, 222, 103, 249, 147, 129,
|
|||
|
|
138, 243, 28, 185, 62, 59, 240, 202, 234, 99, 77, 73, 199, 137, 95, 165,
|
|||
|
|
};
|
|||
|
|
|
|||
|
|
//-----------------------------------------------------------------------------
|
|||
|
|
// String
|
|||
|
|
//-----------------------------------------------------------------------------
|
|||
|
|
unsigned FASTCALL HashString( const char *pszKey )
|
|||
|
|
{
|
|||
|
|
const uint8 *k = (const uint8 *)pszKey;
|
|||
|
|
unsigned even = 0,
|
|||
|
|
odd = 0,
|
|||
|
|
n;
|
|||
|
|
|
|||
|
|
while ((n = *k++) != 0)
|
|||
|
|
{
|
|||
|
|
even = g_nRandomValues[odd ^ n];
|
|||
|
|
if ((n = *k++) != 0)
|
|||
|
|
odd = g_nRandomValues[even ^ n];
|
|||
|
|
else
|
|||
|
|
break;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
return (even << 8) | odd ;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
|
|||
|
|
//-----------------------------------------------------------------------------
|
|||
|
|
// Case-insensitive string
|
|||
|
|
//-----------------------------------------------------------------------------
|
|||
|
|
unsigned FASTCALL HashStringCaseless( const char *pszKey )
|
|||
|
|
{
|
|||
|
|
const uint8 *k = (const uint8 *) pszKey;
|
|||
|
|
unsigned even = 0,
|
|||
|
|
odd = 0,
|
|||
|
|
n;
|
|||
|
|
|
|||
|
|
while ((n = toupper(*k++)) != 0)
|
|||
|
|
{
|
|||
|
|
even = g_nRandomValues[odd ^ n];
|
|||
|
|
if ((n = toupper(*k++)) != 0)
|
|||
|
|
odd = g_nRandomValues[even ^ n];
|
|||
|
|
else
|
|||
|
|
break;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
return (even << 8) | odd;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
//-----------------------------------------------------------------------------
|
|||
|
|
// 32 bit conventional case-insensitive string
|
|||
|
|
//-----------------------------------------------------------------------------
|
|||
|
|
unsigned FASTCALL HashStringCaselessConventional( const char *pszKey )
|
|||
|
|
{
|
|||
|
|
unsigned hash = 0xAAAAAAAA; // Alternating 1's and 0's to maximize the effect of the later multiply and add
|
|||
|
|
|
|||
|
|
for( ; *pszKey ; pszKey++ )
|
|||
|
|
{
|
|||
|
|
hash = ( ( hash << 5 ) + hash ) + (uint8)tolower(*pszKey);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
return hash;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
//-----------------------------------------------------------------------------
|
|||
|
|
// int hash
|
|||
|
|
//-----------------------------------------------------------------------------
|
|||
|
|
unsigned FASTCALL HashInt( const int n )
|
|||
|
|
{
|
|||
|
|
unsigned even, odd;
|
|||
|
|
odd = g_nRandomValues[(((unsigned)n >> 8) & 0xff)];
|
|||
|
|
even = g_nRandomValues[odd ^ ((unsigned)n >> 24)];
|
|||
|
|
odd = g_nRandomValues[even ^ ((unsigned)n >> 16) & 0xff];
|
|||
|
|
even = g_nRandomValues[odd ^ ((unsigned)n >> 8) & 0xff];
|
|||
|
|
odd = g_nRandomValues[even ^ ((unsigned)n & 0xff)];
|
|||
|
|
|
|||
|
|
return (even << 8) | odd;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
//-----------------------------------------------------------------------------
|
|||
|
|
// 4-byte hash
|
|||
|
|
//-----------------------------------------------------------------------------
|
|||
|
|
unsigned FASTCALL Hash4( const void *pKey )
|
|||
|
|
{
|
|||
|
|
const uint32 * p = (const uint32 *) pKey;
|
|||
|
|
unsigned even,
|
|||
|
|
odd,
|
|||
|
|
n;
|
|||
|
|
n = *p;
|
|||
|
|
odd = g_nRandomValues[((n >> 8) & 0xff)];
|
|||
|
|
even = g_nRandomValues[odd ^ (n >> 24)];
|
|||
|
|
odd = g_nRandomValues[even ^ (n >> 16) & 0xff];
|
|||
|
|
even = g_nRandomValues[odd ^ (n >> 8) & 0xff];
|
|||
|
|
odd = g_nRandomValues[even ^ (n & 0xff)];
|
|||
|
|
|
|||
|
|
return (even << 8) | odd;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
|
|||
|
|
//-----------------------------------------------------------------------------
|
|||
|
|
// 8-byte hash
|
|||
|
|
//-----------------------------------------------------------------------------
|
|||
|
|
unsigned FASTCALL Hash8( const void *pKey )
|
|||
|
|
{
|
|||
|
|
const uint32 * p = (const uint32 *) pKey;
|
|||
|
|
unsigned even,
|
|||
|
|
odd,
|
|||
|
|
n;
|
|||
|
|
n = *p;
|
|||
|
|
odd = g_nRandomValues[((n >> 8) & 0xff)];
|
|||
|
|
even = g_nRandomValues[odd ^ (n >> 24)];
|
|||
|
|
odd = g_nRandomValues[even ^ (n >> 16) & 0xff];
|
|||
|
|
even = g_nRandomValues[odd ^ (n >> 8) & 0xff];
|
|||
|
|
odd = g_nRandomValues[even ^ (n & 0xff)];
|
|||
|
|
|
|||
|
|
n = *(p+1);
|
|||
|
|
even = g_nRandomValues[odd ^ (n >> 24)];
|
|||
|
|
odd = g_nRandomValues[even ^ (n >> 16) & 0xff];
|
|||
|
|
even = g_nRandomValues[odd ^ (n >> 8) & 0xff];
|
|||
|
|
odd = g_nRandomValues[even ^ (n & 0xff)];
|
|||
|
|
|
|||
|
|
return (even << 8) | odd;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
|
|||
|
|
//-----------------------------------------------------------------------------
|
|||
|
|
// 12-byte hash
|
|||
|
|
//-----------------------------------------------------------------------------
|
|||
|
|
unsigned FASTCALL Hash12( const void *pKey )
|
|||
|
|
{
|
|||
|
|
const uint32 * p = (const uint32 *) pKey;
|
|||
|
|
unsigned even,
|
|||
|
|
odd,
|
|||
|
|
n;
|
|||
|
|
n = *p;
|
|||
|
|
odd = g_nRandomValues[((n >> 8) & 0xff)];
|
|||
|
|
|
|||
|
|
even = g_nRandomValues[odd ^ (n >> 24)];
|
|||
|
|
odd = g_nRandomValues[even ^ (n >> 16) & 0xff];
|
|||
|
|
even = g_nRandomValues[odd ^ (n >> 8) & 0xff];
|
|||
|
|
odd = g_nRandomValues[even ^ (n & 0xff)];
|
|||
|
|
|
|||
|
|
n = *(p+1);
|
|||
|
|
even = g_nRandomValues[odd ^ (n >> 24)];
|
|||
|
|
odd = g_nRandomValues[even ^ (n >> 16) & 0xff];
|
|||
|
|
even = g_nRandomValues[odd ^ (n >> 8) & 0xff];
|
|||
|
|
odd = g_nRandomValues[even ^ (n & 0xff)];
|
|||
|
|
|
|||
|
|
n = *(p+2);
|
|||
|
|
even = g_nRandomValues[odd ^ (n >> 24)];
|
|||
|
|
odd = g_nRandomValues[even ^ (n >> 16) & 0xff];
|
|||
|
|
even = g_nRandomValues[odd ^ (n >> 8) & 0xff];
|
|||
|
|
odd = g_nRandomValues[even ^ (n & 0xff)];
|
|||
|
|
|
|||
|
|
return (even << 8) | odd;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
|
|||
|
|
//-----------------------------------------------------------------------------
|
|||
|
|
// 16-byte hash
|
|||
|
|
//-----------------------------------------------------------------------------
|
|||
|
|
unsigned FASTCALL Hash16( const void *pKey )
|
|||
|
|
{
|
|||
|
|
const uint32 * p = (const uint32 *) pKey;
|
|||
|
|
unsigned even,
|
|||
|
|
odd,
|
|||
|
|
n;
|
|||
|
|
n = *p;
|
|||
|
|
odd = g_nRandomValues[((n >> 8) & 0xff)];
|
|||
|
|
|
|||
|
|
even = g_nRandomValues[odd ^ (n >> 24)];
|
|||
|
|
odd = g_nRandomValues[even ^ (n >> 16) & 0xff];
|
|||
|
|
even = g_nRandomValues[odd ^ (n >> 8) & 0xff];
|
|||
|
|
odd = g_nRandomValues[even ^ (n & 0xff)];
|
|||
|
|
|
|||
|
|
n = *(p+1);
|
|||
|
|
even = g_nRandomValues[odd ^ (n >> 24)];
|
|||
|
|
odd = g_nRandomValues[even ^ (n >> 16) & 0xff];
|
|||
|
|
even = g_nRandomValues[odd ^ (n >> 8) & 0xff];
|
|||
|
|
odd = g_nRandomValues[even ^ (n & 0xff)];
|
|||
|
|
|
|||
|
|
n = *(p+2);
|
|||
|
|
even = g_nRandomValues[odd ^ (n >> 24)];
|
|||
|
|
odd = g_nRandomValues[even ^ (n >> 16) & 0xff];
|
|||
|
|
even = g_nRandomValues[odd ^ (n >> 8) & 0xff];
|
|||
|
|
odd = g_nRandomValues[even ^ (n & 0xff)];
|
|||
|
|
|
|||
|
|
n = *(p+3);
|
|||
|
|
even = g_nRandomValues[odd ^ (n >> 24)];
|
|||
|
|
odd = g_nRandomValues[even ^ (n >> 16) & 0xff];
|
|||
|
|
even = g_nRandomValues[odd ^ (n >> 8) & 0xff];
|
|||
|
|
odd = g_nRandomValues[even ^ (n & 0xff)];
|
|||
|
|
|
|||
|
|
return (even << 8) | odd;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
|
|||
|
|
//-----------------------------------------------------------------------------
|
|||
|
|
// Arbitrary fixed length hash
|
|||
|
|
//-----------------------------------------------------------------------------
|
|||
|
|
unsigned FASTCALL HashBlock( const void *pKey, unsigned size )
|
|||
|
|
{
|
|||
|
|
const uint8 * k = (const uint8 *) pKey;
|
|||
|
|
unsigned even = 0,
|
|||
|
|
odd = 0,
|
|||
|
|
n;
|
|||
|
|
|
|||
|
|
while (size)
|
|||
|
|
{
|
|||
|
|
--size;
|
|||
|
|
n = *k++;
|
|||
|
|
even = g_nRandomValues[odd ^ n];
|
|||
|
|
if (size)
|
|||
|
|
{
|
|||
|
|
--size;
|
|||
|
|
n = *k++;
|
|||
|
|
odd = g_nRandomValues[even ^ n];
|
|||
|
|
}
|
|||
|
|
else
|
|||
|
|
break;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
return (even << 8) | odd;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
|
|||
|
|
//-----------------------------------------------------------------------------
|
|||
|
|
// Murmur hash
|
|||
|
|
//-----------------------------------------------------------------------------
|
|||
|
|
uint32 MurmurHash2( const void * key, int len, uint32 seed )
|
|||
|
|
{
|
|||
|
|
// 'm' and 'r' are mixing constants generated offline.
|
|||
|
|
// They're not really 'magic', they just happen to work well.
|
|||
|
|
|
|||
|
|
const uint32 m = 0x5bd1e995;
|
|||
|
|
const int r = 24;
|
|||
|
|
|
|||
|
|
// Initialize the hash to a 'random' value
|
|||
|
|
|
|||
|
|
uint32 h = seed ^ len;
|
|||
|
|
|
|||
|
|
// Mix 4 bytes at a time into the hash
|
|||
|
|
|
|||
|
|
const unsigned char * data = (const unsigned char *)key;
|
|||
|
|
|
|||
|
|
while(len >= 4)
|
|||
|
|
{
|
|||
|
|
uint32 k = LittleDWord( *(uint32 *)data );
|
|||
|
|
|
|||
|
|
k *= m;
|
|||
|
|
k ^= k >> r;
|
|||
|
|
k *= m;
|
|||
|
|
|
|||
|
|
h *= m;
|
|||
|
|
h ^= k;
|
|||
|
|
|
|||
|
|
data += 4;
|
|||
|
|
len -= 4;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// Handle the last few bytes of the input array
|
|||
|
|
|
|||
|
|
switch(len)
|
|||
|
|
{
|
|||
|
|
case 3: h ^= data[2] << 16;
|
|||
|
|
case 2: h ^= data[1] << 8;
|
|||
|
|
case 1: h ^= data[0];
|
|||
|
|
h *= m;
|
|||
|
|
};
|
|||
|
|
|
|||
|
|
// Do a few final mixes of the hash to ensure the last few
|
|||
|
|
// bytes are well-incorporated.
|
|||
|
|
|
|||
|
|
h ^= h >> 13;
|
|||
|
|
h *= m;
|
|||
|
|
h ^= h >> 15;
|
|||
|
|
|
|||
|
|
return h;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
#define TOLOWERU( c ) ( ( uint32 ) ( ( ( c >= 'A' ) && ( c <= 'Z' ) )? c + 32 : c ) )
|
|||
|
|
uint32 MurmurHash2LowerCase( char const *pString, uint32 nSeed )
|
|||
|
|
{
|
|||
|
|
int nLen = strlen( pString );
|
|||
|
|
char *p = ( char * ) stackalloc( nLen + 1 );
|
|||
|
|
for( int i = 0; i < nLen ; i++ )
|
|||
|
|
{
|
|||
|
|
p[i] = TOLOWERU( pString[i] );
|
|||
|
|
}
|
|||
|
|
return MurmurHash2( p, nLen, nSeed );
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
|
|||
|
|
//-----------------------------------------------------------------------------
|
|||
|
|
// Murmur hash, 64 bit- endian neutral
|
|||
|
|
//-----------------------------------------------------------------------------
|
|||
|
|
uint64 MurmurHash64( const void * key, int len, uint32 seed )
|
|||
|
|
{
|
|||
|
|
// 'm' and 'r' are mixing constants generated offline.
|
|||
|
|
// They're not really 'magic', they just happen to work well.
|
|||
|
|
|
|||
|
|
const uint32 m = 0x5bd1e995;
|
|||
|
|
const int r = 24;
|
|||
|
|
|
|||
|
|
// Initialize the hash to a 'random' value
|
|||
|
|
|
|||
|
|
uint32 h1 = seed ^ len;
|
|||
|
|
uint32 h2 = 0;
|
|||
|
|
|
|||
|
|
// Mix 4 bytes at a time into the hash
|
|||
|
|
|
|||
|
|
const uint32 * data = (const uint32 *)key;
|
|||
|
|
while ( len >= 8 )
|
|||
|
|
{
|
|||
|
|
uint32 k1 = LittleDWord( *data++ );
|
|||
|
|
k1 *= m; k1 ^= k1 >> r; k1 *= m;
|
|||
|
|
h1 *= m; h1 ^= k1;
|
|||
|
|
len -= 4;
|
|||
|
|
|
|||
|
|
uint32 k2 = LittleDWord( *data++ );
|
|||
|
|
k2 *= m; k2 ^= k2 >> r; k2 *= m;
|
|||
|
|
h2 *= m; h2 ^= k2;
|
|||
|
|
len -= 4;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
if(len >= 4)
|
|||
|
|
{
|
|||
|
|
uint32 k1 = LittleDWord( *data++ );
|
|||
|
|
k1 *= m; k1 ^= k1 >> r; k1 *= m;
|
|||
|
|
h1 *= m; h1 ^= k1;
|
|||
|
|
len -= 4;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// Handle the last few bytes of the input array
|
|||
|
|
switch(len)
|
|||
|
|
{
|
|||
|
|
case 3: h2 ^= ((uint8*)data)[2] << 16;
|
|||
|
|
case 2: h2 ^= ((uint8*)data)[1] << 8;
|
|||
|
|
case 1: h2 ^= ((uint8*)data)[0];
|
|||
|
|
h2 *= m;
|
|||
|
|
};
|
|||
|
|
|
|||
|
|
h1 ^= h2 >> 18; h1 *= m;
|
|||
|
|
h2 ^= h1 >> 22; h2 *= m;
|
|||
|
|
h1 ^= h2 >> 17; h1 *= m;
|
|||
|
|
h2 ^= h1 >> 19; h2 *= m;
|
|||
|
|
|
|||
|
|
uint64 h = h1;
|
|||
|
|
|
|||
|
|
h = (h << 32) | h2;
|
|||
|
|
|
|||
|
|
return h;
|
|||
|
|
}
|
|||
|
|
|