forked from Mirrors/privacore-open-source-search-engine
353 lines
10 KiB
C++
353 lines
10 KiB
C++
// Matt Wells, Copyright, Dec. 2002
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// . generic hash table class
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#ifndef GB_HASHTABLEX_H
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#define GB_HASHTABLEX_H
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#include "SafeBuf.h"
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#include "Sanity.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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const 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 ( ) const { return (m_ks != 0); }
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HashTableX ( );
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~HashTableX ( );
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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 ( const void *key , const void *value , int32_t *slot = NULL );
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// for value-less hashtables
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bool addKey ( const 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 ( const 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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// a replacement for TermTable.cpp
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bool addTerm ( const 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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// a replacement for TermTable.cpp
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uint32_t getScore ( const int64_t *wid ) const {
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int32_t slot = getSlot ( wid );
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if ( slot < 0 ) return 0;
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return *(const uint32_t *)getValueFromSlot ( slot );
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}
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// a replacement for TermTable.cpp
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uint64_t getScore64FromSlot ( int32_t slot ) const {
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return *(const uint64_t *)getValueFromSlot ( slot ); }
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bool addTerm32 ( const 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 ( const 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 ( const 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 ( const int32_t *wid ) const {
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int32_t slot = getSlot ( wid );
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if ( slot < 0 ) return 0;
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return *(const uint32_t *)getValueFromSlot ( slot );
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}
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bool addTerm144 ( const 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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gbshutdownAbort(true);
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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 ( (const 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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gbshutdownAbort(true);
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/*NOTREACHED*/
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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 () const;
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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 ( const void *key ) {
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// make it fast
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if ( m_ks == 4 ) return getValue32 ( *(const int32_t *)key );
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if ( m_ks == 8 ) return getValue64 ( *(const 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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// . 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 ) { gbshutdownAbort(true); }
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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 ) { gbshutdownAbort(true); }
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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 ( const void *key ) const { return (getSlot(key) < 0); }
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bool isInTable ( const void *key ) const { return (getSlot(key) >= 0); }
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bool isEmpty ( int32_t n ) const { return (m_flags[n] == 0); }
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bool isTableEmpty ( ) const { return (m_numSlotsUsed == 0); }
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void * getKey ( int32_t n ) { return m_keys + n * m_ks; }
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const void *getKey ( int32_t n ) const { 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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const void *getKeyFromSlot ( int32_t n ) const { return m_keys + n * m_ks; }
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int64_t getKey64FromSlot ( int32_t n ) const {
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return *(int64_t *)(m_keys+n*m_ks); }
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int32_t getSlot ( const void *key ) const { return getOccupiedSlotNum ( key ); }
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int32_t getNextSlot ( int32_t slot, const void *key ) const;
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// count how many slots have this key
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int32_t getCount ( const void *key ) const;
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void setValue ( int32_t n , const void *val ) {
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if (m_ds == 4) ((int32_t *)m_vals)[n] = *(const int32_t *)val;
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else if (m_ds == 8) ((int64_t *)m_vals)[n] = *(const 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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const void *getValueFromSlot ( int32_t n ) const { 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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const void *getDataFromSlot ( int32_t n ) const { return 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 ( ) const { return m_numSlotsUsed; }
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int32_t getNumUsedSlots ( ) const { return m_numSlotsUsed; }
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bool isEmpty() const {
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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 ( ) const { return m_numSlots; }
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// both return false and set g_errno on error, true otherwise
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bool load ( const char *dir, const char *filename ,
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char **tbuf = NULL , int32_t *tsize = NULL );
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bool save ( const char *dir, const char *filename ,
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const char *tbuf = NULL , int32_t tsize = 0);
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bool setTableSize ( int32_t numSlots , char *buf , int32_t bufSize );
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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 ( const void *key ) const;
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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
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bool m_addIffNotUnique;
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bool m_isSaving;
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bool m_needsSave;
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// limits growing to this # of slots total
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int64_t m_maxSlots;
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const 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
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// in the table itself reference.
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char *m_txtBuf;
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int32_t m_txtBufSize;
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};
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#endif // GB_HASHTABLEX_H
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