533 lines
15 KiB
C++
533 lines
15 KiB
C++
// Matt Wells, Copyright, Dec. 2002
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// . generic hash table class
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#ifndef _HASHTABLEX_H_
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#define _HASHTABLEX_H_
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#include "SafeBuf.h"
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class HashTableX {
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public:
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bool set ( int32_t keySize ,
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int32_t dataSize ,
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int32_t initialNumSlots , // = 0 ,
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char *buf , // = NULL ,
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int32_t bufSize , // = 0 ,
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bool allowDups , // = false ,
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int32_t niceness , // = MAX_NICENESS ,
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char *allocName ,
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bool useKeyMagic = false );
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// key size is 0 if UNinitialized
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bool isInitialized ( ) { return (m_ks != 0); };
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HashTableX ( );
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~HashTableX ( );
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void constructor ();
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void destructor ();
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// . add key/value entry to hash table
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// . will grow hash table if it needs to
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// . returns false and sets g_errno on error, returns true otherwise
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bool addKey ( void *key , void *value , int32_t *slot = NULL );
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// for value-less hashtables
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bool addKey ( void *key );
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// . remove key/value entry to hash table.
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// . returns false and sets g_errno on error.
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bool removeKey ( void *key );
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// same as remove
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bool deleteSlot ( int32_t n ) { return removeSlot(n); };
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// like removeKey. returns false and sets g_errno on error.
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bool removeSlot ( int32_t n );
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// see how optimal the hashtable is
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int32_t getLongestString ();
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// how many keys are dups
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int32_t getNumDups();
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// if in a thread to dont allow it to grow
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void setNonGrow() { m_allowGrowth = false; }
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bool m_allowGrowth;
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bool addFloat ( int32_t *wid , float score ) {
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int32_t slot = getSlot ( wid );
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if ( slot<0 ) return addKey( wid ,&score,&slot);
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float *val = (float *)getValueFromSlot ( slot );
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*val = *val + score;
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return true;
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};
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// a replacement for TermTable.cpp
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bool addTerm ( int64_t *wid , int32_t score = 1 ) {
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int32_t slot = getSlot ( wid );
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if ( slot<0 ) return addKey( wid ,&score,&slot);
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uint32_t *val = (uint32_t *)getValueFromSlot ( slot );
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// overflow check
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if ( *val + (uint32_t)score < *val ) *val = 0xffffffff;
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else *val = *val + score;
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return true;
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};
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bool addTerm64 ( char *str ) {
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uint64_t wid64 = hash64n ( str );
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return addTerm64 ( (int64_t *)&wid64 );
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};
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bool addTerm64 ( int64_t *wid , int32_t score = 1 ) {
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return addTerm(wid,score); }
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// a replacement for TermTable.cpp
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uint32_t getScore ( int64_t *wid ) {
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int32_t slot = getSlot ( wid );
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if ( slot < 0 ) return 0;
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return *(uint32_t *)getValueFromSlot ( slot );
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};
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// a replacement for TermTable.cpp
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uint32_t getScoreFromSlot ( int32_t slot ) {
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return *(uint32_t *)getValueFromSlot ( slot ); };
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uint64_t getScore64FromSlot ( int32_t slot ) {
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return *(uint64_t *)getValueFromSlot ( slot ); };
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bool addTerm32 ( char *str ) {
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uint32_t wid32 = hash32n ( str );
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return addTerm32 ( &wid32 );
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};
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bool addTerm32 ( int32_t *wid , int32_t score = 1 ) {
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int32_t slot = getSlot ( wid );
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if ( slot<0 ) return addKey( wid ,&score,&slot);
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uint32_t *val = (uint32_t *)getValueFromSlot ( slot );
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// overflow check
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if ( *val + (uint32_t)score < *val ) *val = 0xffffffff;
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else *val = *val + score;
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return true;
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};
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//bool addTerm32 ( uint32_t *wid , int32_t score = 1 ) {
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// int32_t slot = getSlot ( wid );
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// if ( slot<0 ) return addKey( wid ,&score,&slot);
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// uint32_t *val = (uint32_t *)getValueFromSlot ( slot );
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// // overflow check
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// if ( *val + (uint32_t)score < *val ) *val = 0xffffffff;
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// else *val = *val + score;
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// return true;
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//};
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bool addTerm32 ( uint32_t *wid , int32_t score = 1 ) {
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int32_t slot = getSlot ( wid );
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if ( slot<0 ) return addKey( wid ,&score,&slot);
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uint32_t *val = (uint32_t *)getValueFromSlot ( slot );
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// overflow check
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if ( *val + (uint32_t)score < *val ) *val = 0xffffffff;
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else *val = *val + score;
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return true;
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};
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bool addScore ( int32_t *key , int32_t score = 1 ) {
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return addTerm32 ( key , score );
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};
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uint32_t getScore32 ( int32_t *wid ) {
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int32_t slot = getSlot ( wid );
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if ( slot < 0 ) return 0;
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return *(uint32_t *)getValueFromSlot ( slot );
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};
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uint32_t getScore32 ( uint32_t *wid ) {
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int32_t slot = getSlot ( wid );
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if ( slot < 0 ) return 0;
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return *(uint32_t *)getValueFromSlot ( slot );
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};
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bool addTerm144 ( key144_t *kp , int32_t score = 1 ) {
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/*
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// debug XmlDoc.cpp's hash table
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int64_t termId = ((key144_t *)kp)->n2 >> 16;
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uint64_t d = 0LL;
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d = ((unsigned char *)kp)[11];
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d <<= 32;
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d |= *(uint32_t *)(((unsigned char *)kp)+7);
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d >>= 2;
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if ( d==110324895284 && termId == 39206941907955LL ) {
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log("got it");
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char *xx=NULL;*xx=0;
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}
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*/
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// grow it!
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if ( (m_numSlots < 20 || 4 * m_numSlotsUsed >= m_numSlots) &&
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m_numSlots < m_maxSlots ) {
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int64_t growTo ;
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growTo = ((int64_t)m_numSlots * 150LL )/100LL+20LL;
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if ( growTo > m_maxSlots ) growTo = m_maxSlots;
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if ( ! setTableSize ( (int32_t)growTo , NULL , 0 ) )
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return false;
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}
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// hash it up
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int32_t n = hash32 ( (char *)kp, 18 );
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// then mask it
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n &= m_mask;
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int32_t count = 0;
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while ( count++ < m_numSlots ) {
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// this is set to 0x01 if non-empty
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if ( m_flags [ n ] == 0 ) {
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gbmemcpy( &((key144_t *)m_keys)[n] ,kp,18);
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m_vals[n*m_ds] = score;
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m_flags[n] = 1;
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m_numSlotsUsed++;
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return true;
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}
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// get the key there
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if (((key144_t *)m_keys)[n] == *kp) {
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uint32_t *val = (uint32_t *)&m_vals[n*m_ds];
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// overflow check
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if ( *val + (uint32_t)score < *val )
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*val = 0xffffffff;
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else
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*val = *val + score;
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return true;
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}
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// advance otherwise
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if ( ++n == m_numSlots ) n = 0;
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}
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// crazy!
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log("hash: table is full!");
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char *xx=NULL;*xx=0;
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return true;
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};
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// return 32-bit checksum of keys in table
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int32_t getKeyChecksum32 ();
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int32_t getSlot144 ( key144_t *kp ) {
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// return NULL if completely empty
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if ( m_numSlots <= 0 ) return -1;
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// sanity check
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if ( m_ks != 18 ) { char *xx=NULL;*xx=0; }
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// mask on termid bits i guess
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//int32_t n = *((uint32_t *)(((char *)kp)+12));
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// xor with word posand hashgroup ,etc
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//n ^= *((uint32_t *)(((char *)kp)+2));
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int32_t n = hash32 ( (char *)kp, 18 );
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// then mask it
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n &= m_mask;
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int32_t count = 0;
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while ( count++ < m_numSlots ) {
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// this is set to 0x01 if non-empty
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if ( m_flags [ n ] == 0 ) return -1;
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// get the key there
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if (((key144_t *)m_keys)[n] == *kp)
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return n;
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// advance otherwise
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if ( ++n == m_numSlots ) n = 0;
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}
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return -1;
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};
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// . used by ../english/Bits.h to store stop words, abbr's, ...
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// . returns the score for this termId (0 means empty usually)
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// . return 0 if key not in hash table
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void *getValue ( void *key ) {
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// make it fast
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if ( m_ks == 4 ) return getValue32 ( *(int32_t *)key );
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if ( m_ks == 8 ) return getValue64 ( *(int64_t *)key );
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// returns -1 if key not in hash table
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int32_t n = getOccupiedSlotNum ( key );
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if ( n < 0 ) return NULL;
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return &m_vals[n*m_ds];
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};
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int32_t getSlot32 ( int32_t key ) {
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// return NULL if completely empty
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if ( m_numSlots <= 0 ) return -1;
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// sanity check
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if ( m_ks != 4 ) { char *xx=NULL;*xx=0; }
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int32_t n;
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if ( ! m_useKeyMagic ) {
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// mask on the lower 32 bits i guess
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n = key & m_mask;
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}
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else {
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// get lower 32 bits of key
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n =*(uint32_t *)(((char *)&key) +m_maskKeyOffset);
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// use magic to "randomize" key a little
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n^=g_hashtab[(unsigned char)((char *)&key)[m_maskKeyOffset]][0];
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// mask on the lower 32 bits i guess
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n &= m_mask;
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}
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int32_t count = 0;
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while ( count++ < m_numSlots ) {
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// this is set to 0x01 if non-empty
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if ( m_flags [ n ] == 0 ) return -1;
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// get the key there
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if (((int32_t *)m_keys)[n] == key)
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return n;
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// advance otherwise
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if ( ++n == m_numSlots ) n = 0;
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}
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return -1;
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};
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// . specialized for 32-bit keys for speed
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// . returns NULL if not in table
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void *getValue32 ( int32_t key ) {
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// return NULL if completely empty
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if ( m_numSlots <= 0 ) return NULL;
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// sanity check
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if ( m_ks != 4 ) { char *xx=NULL;*xx=0; }
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int32_t n;
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if ( ! m_useKeyMagic ) {
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// mask on the lower 32 bits i guess
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n = key & m_mask;
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}
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else {
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// get lower 32 bits of key
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//n = (uint32_t)key;
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n =*(uint32_t *)(((char *)&key) +m_maskKeyOffset);
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// use magic to "randomize" key a little
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n^=g_hashtab[(unsigned char)((char *)&key)[m_maskKeyOffset]][0];
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// mask on the lower 32 bits i guess
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n &= m_mask;
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}
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int32_t count = 0;
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while ( count++ < m_numSlots ) {
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// this is set to 0x01 if non-empty
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if ( m_flags [ n ] == 0 ) return NULL;
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// get the key there
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if (((int32_t *)m_keys)[n] == key)
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return &m_vals[n*m_ds];
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// advance otherwise
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if ( ++n == m_numSlots ) n = 0;
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}
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return NULL;
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};
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// . specialized for 64-bit keys for speed
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// . returns NULL if not in table
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void *getValue64 ( int64_t key ) {
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// return NULL if completely empty
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if ( m_numSlots <= 0 ) return NULL;
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// sanity check
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if ( m_ks != 8 ) { char *xx=NULL;*xx=0; }
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int32_t n;
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if ( ! m_useKeyMagic ) {
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// mask on the lower 32 bits i guess
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// get lower 32 bits of key
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n = key & m_mask;
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}
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else {
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// use magic to "randomize" key a little
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n =*(uint32_t *)(((char *)&key) +m_maskKeyOffset);
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n ^= g_hashtab[(unsigned char)((char *)&key)[m_maskKeyOffset]][0];
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// mask on the lower 32 bits i guess
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n &= m_mask;
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}
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int32_t count = 0;
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while ( count++ < m_numSlots ) {
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// this is set to 0x01 if non-empty
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if ( m_flags [ n ] == 0 ) return NULL;
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// get the key there
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if (((int64_t *)m_keys)[n] == key)
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return &m_vals[n*m_ds];
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// advance otherwise
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if ( ++n == m_numSlots ) n = 0;
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}
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return NULL;
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};
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// value of 0 means empty
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bool isEmpty ( void *key ) { return (getSlot(key) < 0); };
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bool isInTable ( void *key ) { return (getSlot(key) >= 0); };
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bool isEmpty ( int32_t n ) { return (m_flags[n] == 0); };
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bool isTableEmpty ( ) { return (m_numSlotsUsed == 0); };
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void *getKey ( int32_t n ) { return m_keys + n * m_ks; };
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void *getKeyFromSlot ( int32_t n ) { return m_keys + n * m_ks; };
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int64_t getKey64FromSlot ( int32_t n ) {
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return *(int64_t *)(m_keys+n*m_ks); }
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int32_t getKey32FromSlot ( int32_t n ) {
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return *(int32_t *)(m_keys+n*m_ks); }
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int32_t getSlot ( void *key ) { return getOccupiedSlotNum ( key ); };
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// . specialized for 64-bit keys for speed
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// . returns -1 if not in table
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int32_t getSlot64 ( int64_t *key ) {
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// return NULL if completely empty
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if ( m_numSlots <= 0 ) return -1;
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// sanity check
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if ( m_ks != 8 ) { char *xx=NULL;*xx=0; }
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int32_t n;
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if ( ! m_useKeyMagic ) {
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// mask on the lower 32 bits i guess
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n = *key & m_mask;
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}
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else {
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// use magic to "randomize" key a little
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n =*(uint32_t *)(((char *)&key) +m_maskKeyOffset);
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n ^= g_hashtab[(unsigned char)((char *)key)[m_maskKeyOffset]][0];
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// mask on the lower 32 bits i guess
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n &= m_mask;
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}
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int32_t count = 0;
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while ( count++ < m_numSlots ) {
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// this is set to 0x01 if non-empty
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if ( m_flags [ n ] == 0 ) return -1;
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// get the key there
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if (((int64_t *)m_keys)[n] == *key)
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return n;
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// advance otherwise
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if ( ++n == m_numSlots ) n = 0;
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}
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return -1;
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};
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int32_t getNextSlot ( int32_t slot , void *key );
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// count how many slots have this key
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int32_t getCount ( void *key );
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void setValue ( int32_t n , void *val ) {
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if (m_ds == 4) ((int32_t *)m_vals)[n] = *(int32_t *)val;
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else if (m_ds == 8) ((int64_t *)m_vals)[n] = *(int64_t *)val;
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else gbmemcpy(m_vals+n*m_ds,val,m_ds);
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};
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void *getValueFromSlot ( int32_t n ) { return m_vals + n * m_ds; };
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void *getValFromSlot ( int32_t n ) { return m_vals + n * m_ds; };
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void *getDataFromSlot ( int32_t n ) { return m_vals + n * m_ds; };
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int32_t getVal32FromSlot ( int32_t n ){return *(int32_t *)(m_vals+n*m_ds);};
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int32_t getValue32FromSlot ( int32_t n ){return *(int32_t *)(m_vals+n*m_ds);};
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// frees the used memory, etc.
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void reset ( );
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// removes all key/value pairs from hash table, vacates all slots
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void clear ( );
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// how many are occupied?
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int32_t getNumSlotsUsed ( ) { return m_numSlotsUsed; };
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int32_t getNumUsedSlots ( ) { return m_numSlotsUsed; };
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bool isEmpty() {
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if ( m_numSlotsUsed == 0 ) return true;
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return false; };
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// how many are there total? used and unused.
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int32_t getNumSlots ( ) { return m_numSlots; };
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// how many bytes are required to serialize this hash table?
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int32_t getStoredSize();
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// return buffer we allocated and stored into. return -1 on error
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// with g_errno set.
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char *serialize ( int32_t *bufSize ) ;
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// int16_tcut
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int32_t serialize ( class SafeBuf *sb );
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// returns # bytes written into "buf"
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int32_t serialize ( char *buf , int32_t bufSize );
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// inflate it. returns false with g_errno set on error
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bool deserialize ( char *buf , int32_t bufSize , int32_t niceness );
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// both return false and set g_errno on error, true otherwise
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bool load ( char *dir , char *filename ,
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char **tbuf = NULL , int32_t *tsize = NULL );
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bool save ( char *dir , char *filename ,
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char *tbuf = NULL , int32_t tsize = 0);
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bool save ( char *dir , char *filename , SafeBuf *tbuf ) {
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return save ( dir,
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filename,
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tbuf->getBufStart(),
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tbuf->length());
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};
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bool load ( char *dir , char *filename , SafeBuf *fillBuf );
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// thread based save
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bool fastSave ( bool useThread ,
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char *dir ,
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char *filename ,
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char *tbuf ,
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int32_t tsize ,
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void *state ,
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void (* callback)(void *state) );
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bool setTableSize ( int32_t numSlots , char *buf , int32_t bufSize );
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// print as text into sb for debugging
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void print ( class SafeBuf *sb );
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void disableWrites () { m_isWritable = false; };
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void enableWrites () { m_isWritable = true ; };
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bool m_isWritable;
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private:
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int32_t getOccupiedSlotNum ( void *key ) ;
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public:
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// . the array of buckets in which we store the terms
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// . scores are allowed to exceed 8 bits for weighting purposes
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char *m_keys;
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char *m_vals;
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char *m_flags;
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int32_t m_numSlots;
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int32_t m_numSlotsUsed;
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uint32_t m_mask;
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char m_doFree;
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char *m_buf;
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int32_t m_bufSize;
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char m_useKeyMagic;
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int32_t m_ks;
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int32_t m_ds;
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char m_allowDups;
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|
int32_t m_niceness;
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// a flag used by XmlDoc.cpp
|
|
bool m_addIffNotUnique;
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bool m_isSaving;
|
|
bool m_needsSave;
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char m_dir[100];
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|
char m_filename[64];
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void *m_state ;
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|
void (* m_callback) ( void *state);
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char *m_tbuf ;
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|
int32_t m_tsize ;
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// limits growing to this # of slots total
|
|
int64_t m_maxSlots;
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|
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char *m_allocName;
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|
|
int32_t m_maskKeyOffset;
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|
|
// the addon buf used by SOME hashtables. data that the ptrs
|
|
// in the table itself reference.
|
|
char *m_txtBuf;
|
|
int32_t m_txtBufSize;
|
|
};
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#endif
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