mirror of
https://github.com/gigablast/open-source-search-engine.git
synced 2024-10-04 20:27:43 +03:00
274 lines
7.3 KiB
C++
274 lines
7.3 KiB
C++
#include "gb-include.h"
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unsigned long long g_hashtab[256][256] ;
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// . now we explicitly specify the zobrist table so we are compatible
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// with cygwin and apple environments
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// . no, let's just define the rand2() function to be compatible then
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//#include "hashtab.cpp"
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// . used for computing zobrist hash of a string up to 256 chars long
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// . first array component is the max length, 256, of the string
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bool hashinit () {
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static bool s_initialized = false;
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// bail if we already called this
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if ( s_initialized ) return true;
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// show RAND_MAX
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//printf("RAND_MAX = %lu\n", RAND_MAX ); it's 0x7fffffff
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// seed with same value so we get same rand sequence for all
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srand ( 1945687 );
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//if ( g_hashtab[0][0] != 6720717044602784129LL ) return false;
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//s_initialized = true;
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//return true;
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//fprintf(stdout,"g_hashtab[256][256]={\n");
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for ( long i = 0 ; i < 256 ; i++ ) {
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//fprintf(stdout,"{");
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for ( long j = 0 ; j < 256 ; j++ ) {
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g_hashtab [i][j] = (unsigned long long)rand();
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// the top bit never gets set, so fix
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if ( rand() > (0x7fffffff / 2) )
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g_hashtab[i][j] |= 0x80000000;
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g_hashtab [i][j] <<= 32;
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g_hashtab [i][j] |= (unsigned long long)rand();
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// the top bit never gets set, so fix
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if ( rand() > (0x7fffffff / 2) )
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g_hashtab[i][j] |= 0x80000000;
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// fixes for cygwin/apple
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//fprintf(stdout,"%lluULL",g_hashtab[i][j]);
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//if ( j+1<256 ) fprintf(stdout,",");
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}
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//fprintf(stdout,"},\n");
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}
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//fprintf(stdout,"};\n");
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//fflush ( stdout );
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if ( g_hashtab[0][0] != 6720717044602784129LL ) return false;
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s_initialized = true;
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return true;
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}
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// TODO: ensure this wraps over properly
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unsigned char hash8 ( char *s , long len ) {
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unsigned char h = 0;
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long i = 0;
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while ( i < len ) {
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h ^= (unsigned char) g_hashtab [(unsigned char)i]
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[(unsigned char)s[i]];
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i++;
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}
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return h;
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}
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unsigned short hash16 ( char *s , long len ) {
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unsigned short h = 0;
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long i = 0;
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while ( i < len ) {
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h ^= (unsigned short) g_hashtab [(unsigned char)i]
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[(unsigned char)s[i]];
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i++;
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}
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return h;
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}
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unsigned long hash32n ( char *s ) {
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unsigned long h = 0;
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long i = 0;
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while ( s[i] ) {
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h ^= (unsigned long) g_hashtab [(unsigned char)i]
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[(unsigned char)s[i]];
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i++;
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}
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return h;
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}
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uint64_t hash64n ( char *s, unsigned long long startHash ) {
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unsigned long long h = startHash;
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for ( long i = 0 ; s[i] ; i++ )
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h ^= g_hashtab [(unsigned char)i] [(unsigned char)s[i]];
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return h;
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}
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uint64_t hash64n_nospaces ( char *s, long len ) {
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unsigned long long h = 0LL;
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long k = 0;
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for ( long i = 0 ; i<len ; i++ ) {
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if ( s[i] == ' ' ) continue;
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h ^= g_hashtab [(unsigned char)k] [(unsigned char)s[i]];
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k++;
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}
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return h;
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}
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unsigned long hash32 ( char *s, long len, unsigned long startHash ) {
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unsigned long h = startHash;
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long i = 0;
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while ( i < len ) {
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h ^= (unsigned long) g_hashtab [(unsigned char)i]
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[(unsigned char)s[i]];
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i++;
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}
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return h;
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}
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unsigned long hash32Lower_a ( char *s,long len,unsigned long startHash){
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unsigned long h = startHash;
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long i = 0;
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while ( i < len ) {
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h ^= (unsigned long) g_hashtab [(unsigned char)i]
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[(unsigned char)to_lower_a(s[i])];
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i++;
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}
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return h;
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}
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u_int96_t hash96 ( char *s, long slen, u_int96_t startHash ) {
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u_int96_t h;
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h.n0 = hash64 ( s , slen , startHash.n0 );
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h.n1 = hash32 ( s , slen , startHash.n1 );
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return h;
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}
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u_int96_t hash96 ( u_int96_t h1 , u_int96_t h2 ) {
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h1.n0 = hash64 ( h1.n0 , h2.n0 );
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h1.n1 = hash32h ( h1.n1 , h2.n1 );
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return h1;
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}
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u_int96_t hash96 ( long h1 , u_int96_t h2 ) {
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h2.n0 = hash64 ( h1 , h2.n0 );
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h2.n1 = hash32h ( h1 , h2.n1 );
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return h2;
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}
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u_int128_t hash128 ( u_int128_t h1 , u_int128_t h2 ) {
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h1.n0 = hash64 ( h1.n0 , h2.n0 );
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h1.n1 = hash64 ( h1.n1 , h2.n1 );
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return h1;
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}
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u_int128_t hash128 ( long h1 , u_int128_t h2 ) {
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h2.n0 = hash64 ( h1 , h2.n0 );
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h2.n1 = hash64 ( h1 , h2.n1 );
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return h2;
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}
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// . combine 2 hashes into 1
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// . TODO: ensure this is a good way
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// . used for combining words' hashes into phrases (also fields,collections)..
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unsigned long hash32h ( unsigned long h1 , unsigned long h2 ) {
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// treat the 16 bytes as a string now instead of multiplying them
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unsigned long h = 0;
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h ^= g_hashtab [ 0] [ ((unsigned char *)&h1)[0] ] ;
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h ^= g_hashtab [ 1] [ ((unsigned char *)&h1)[1] ] ;
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h ^= g_hashtab [ 2] [ ((unsigned char *)&h1)[2] ] ;
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h ^= g_hashtab [ 3] [ ((unsigned char *)&h1)[3] ] ;
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h ^= g_hashtab [ 4] [ ((unsigned char *)&h2)[0] ] ;
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h ^= g_hashtab [ 5] [ ((unsigned char *)&h2)[1] ] ;
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h ^= g_hashtab [ 6] [ ((unsigned char *)&h2)[2] ] ;
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h ^= g_hashtab [ 7] [ ((unsigned char *)&h2)[3] ] ;
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return h;
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}
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uint64_t hash64h ( uint64_t h1 , uint64_t h2 ) {
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// treat the 16 bytes as a string now instead of multiplying them
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uint64_t h = 0;
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h ^= g_hashtab [ 0] [ ((unsigned char *)&h1)[0] ] ;
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h ^= g_hashtab [ 1] [ ((unsigned char *)&h1)[1] ] ;
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h ^= g_hashtab [ 2] [ ((unsigned char *)&h1)[2] ] ;
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h ^= g_hashtab [ 3] [ ((unsigned char *)&h1)[3] ] ;
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h ^= g_hashtab [ 4] [ ((unsigned char *)&h1)[4] ] ;
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h ^= g_hashtab [ 5] [ ((unsigned char *)&h1)[5] ] ;
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h ^= g_hashtab [ 6] [ ((unsigned char *)&h1)[6] ] ;
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h ^= g_hashtab [ 7] [ ((unsigned char *)&h1)[7] ] ;
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h ^= g_hashtab [ 8] [ ((unsigned char *)&h2)[0] ] ;
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h ^= g_hashtab [ 9] [ ((unsigned char *)&h2)[1] ] ;
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h ^= g_hashtab [10] [ ((unsigned char *)&h2)[2] ] ;
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h ^= g_hashtab [11] [ ((unsigned char *)&h2)[3] ] ;
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h ^= g_hashtab [12] [ ((unsigned char *)&h2)[4] ] ;
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h ^= g_hashtab [13] [ ((unsigned char *)&h2)[5] ] ;
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h ^= g_hashtab [14] [ ((unsigned char *)&h2)[6] ] ;
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h ^= g_hashtab [15] [ ((unsigned char *)&h2)[7] ] ;
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return h;
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}
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void hash2string ( unsigned long long h , char *buf ) {
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// sprintf(buf, "%016lx", h );
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sprintf(buf , "%08lx", (unsigned long)(h >> 32) );
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sprintf(buf+10, "%08lx", (unsigned long)h );
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}
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// only utf8 allowed now
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uint32_t hash32d ( char *p, char *pend ) {
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return (uint32_t)hash64d ( p , pend - p);
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}
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// . only utf8 allowed now
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// . stole this from hash.h hash64LowerE()
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unsigned long long hash64d ( char *p, long plen ) {
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char *pend = p + plen;
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uint64_t h = 0;
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uint8_t i = 0;
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char cs = 0;
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for ( ; p < pend ; p += cs ) {
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// get the size
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cs = getUtf8CharSize ( p );
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// deal with one ascii char quickly
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if ( cs == 1 ) {
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// clean it up here
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uint8_t c = getClean_a ( *p );
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h ^= g_hashtab [i++] [c];
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continue;
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}
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// filter it
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UChar32 x = getClean_utf8 ( p );
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// back to utf8
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uint8_t tmp[4];
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char ncs = utf8Encode ( x , (char *)tmp );
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// sanity check
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if ( ncs > 4 ) { char *xx=NULL;*xx=0; }
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// hash it up
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h ^= g_hashtab [i++][tmp[0]];
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if ( ncs == 1 ) continue;
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h ^= g_hashtab [i++][tmp[1]];
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if ( ncs == 2 ) continue;
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h ^= g_hashtab [i++][tmp[2]];
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if ( ncs == 3 ) continue;
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h ^= g_hashtab [i++][tmp[3]];
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}
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return h;
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}
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uint8_t getClean_a ( char c ) {
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if ( is_alnum_a ( c ) ) return to_lower_a(c);
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if ( c == '\n' ) return '\0';
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if ( c == '-' ) return c;
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if ( c == '\'' ) return c;
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if ( c == '\0' ) return c;
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return ' ';
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}
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UChar32 getClean_utf8 ( char *src ) {
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// do ascii fast
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if ( is_ascii ( *src ) ) return (UChar32)getClean_a(*src);
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// otherwise, lower case it
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UChar32 x = utf8Decode(src);
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// convert to upper
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x = ucToLower (x);
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// return if alnum
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if ( ucIsAlnum ( x ) ) return x;
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// everything else is converted to space
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return (UChar32)' ';
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}
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//
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// was inlined in hash.h below here
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//
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