mirror of
https://github.com/dhewm/dhewm3.git
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404 lines
8.7 KiB
C++
404 lines
8.7 KiB
C++
/*
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===========================================================================
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Doom 3 GPL Source Code
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Copyright (C) 1999-2011 id Software LLC, a ZeniMax Media company.
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This file is part of the Doom 3 GPL Source Code ("Doom 3 Source Code").
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Doom 3 Source Code is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Doom 3 Source Code is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Doom 3 Source Code. If not, see <http://www.gnu.org/licenses/>.
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In addition, the Doom 3 Source Code is also subject to certain additional terms. You should have received a copy of these additional terms immediately following the terms and conditions of the GNU General Public License which accompanied the Doom 3 Source Code. If not, please request a copy in writing from id Software at the address below.
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If you have questions concerning this license or the applicable additional terms, you may contact in writing id Software LLC, c/o ZeniMax Media Inc., Suite 120, Rockville, Maryland 20850 USA.
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===========================================================================
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*/
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#ifndef __HASHTABLE_H__
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#define __HASHTABLE_H__
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/*
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===============================================================================
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General hash table. Slower than idHashIndex but it can also be used for
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linked lists and other data structures than just indexes or arrays.
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===============================================================================
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*/
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template< class Type >
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class idHashTable {
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public:
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idHashTable( int newtablesize = 256 );
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idHashTable( const idHashTable<Type> &map );
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~idHashTable( void );
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// returns total size of allocated memory
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size_t Allocated( void ) const;
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// returns total size of allocated memory including size of hash table type
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size_t Size( void ) const;
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void Set( const char *key, Type &value );
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bool Get( const char *key, Type **value = NULL ) const;
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bool Remove( const char *key );
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void Clear( void );
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void DeleteContents( void );
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// the entire contents can be itterated over, but note that the
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// exact index for a given element may change when new elements are added
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int Num( void ) const;
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Type * GetIndex( int index ) const;
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int GetSpread( void ) const;
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private:
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struct hashnode_s {
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idStr key;
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Type value;
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hashnode_s *next;
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hashnode_s( const idStr &k, Type v, hashnode_s *n ) : key( k ), value( v ), next( n ) {};
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hashnode_s( const char *k, Type v, hashnode_s *n ) : key( k ), value( v ), next( n ) {};
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};
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hashnode_s ** heads;
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int tablesize;
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int numentries;
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int tablesizemask;
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int GetHash( const char *key ) const;
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};
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/*
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================
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idHashTable<Type>::idHashTable
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================
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*/
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template< class Type >
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ID_INLINE idHashTable<Type>::idHashTable( int newtablesize ) {
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assert( idMath::IsPowerOfTwo( newtablesize ) );
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tablesize = newtablesize;
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assert( tablesize > 0 );
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heads = new hashnode_s *[ tablesize ];
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memset( heads, 0, sizeof( *heads ) * tablesize );
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numentries = 0;
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tablesizemask = tablesize - 1;
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}
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/*
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================
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idHashTable<Type>::idHashTable
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================
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*/
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template< class Type >
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ID_INLINE idHashTable<Type>::idHashTable( const idHashTable<Type> &map ) {
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int i;
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hashnode_s *node;
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hashnode_s **prev;
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assert( map.tablesize > 0 );
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tablesize = map.tablesize;
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heads = new hashnode_s *[ tablesize ];
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numentries = map.numentries;
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tablesizemask = map.tablesizemask;
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for( i = 0; i < tablesize; i++ ) {
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if ( !map.heads[ i ] ) {
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heads[ i ] = NULL;
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continue;
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}
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prev = &heads[ i ];
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for( node = map.heads[ i ]; node != NULL; node = node->next ) {
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*prev = new hashnode_s( node->key, node->value, NULL );
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prev = &( *prev )->next;
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}
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}
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}
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/*
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================
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idHashTable<Type>::~idHashTable<Type>
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================
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*/
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template< class Type >
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ID_INLINE idHashTable<Type>::~idHashTable( void ) {
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Clear();
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delete[] heads;
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}
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/*
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================
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idHashTable<Type>::Allocated
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================
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*/
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template< class Type >
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ID_INLINE size_t idHashTable<Type>::Allocated( void ) const {
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return sizeof( heads ) * tablesize + sizeof( *heads ) * numentries;
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}
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/*
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================
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idHashTable<Type>::Size
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================
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*/
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template< class Type >
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ID_INLINE size_t idHashTable<Type>::Size( void ) const {
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return sizeof( idHashTable<Type> ) + sizeof( heads ) * tablesize + sizeof( *heads ) * numentries;
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}
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/*
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================
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idHashTable<Type>::GetHash
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================
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*/
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template< class Type >
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ID_INLINE int idHashTable<Type>::GetHash( const char *key ) const {
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return ( idStr::Hash( key ) & tablesizemask );
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}
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/*
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================
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idHashTable<Type>::Set
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================
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*/
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template< class Type >
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ID_INLINE void idHashTable<Type>::Set( const char *key, Type &value ) {
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hashnode_s *node, **nextPtr;
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int hash, s;
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hash = GetHash( key );
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for( nextPtr = &(heads[hash]), node = *nextPtr; node != NULL; nextPtr = &(node->next), node = *nextPtr ) {
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s = node->key.Cmp( key );
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if ( s == 0 ) {
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node->value = value;
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return;
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}
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if ( s > 0 ) {
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break;
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}
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}
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numentries++;
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*nextPtr = new hashnode_s( key, value, heads[ hash ] );
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(*nextPtr)->next = node;
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}
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/*
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================
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idHashTable<Type>::Get
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================
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*/
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template< class Type >
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ID_INLINE bool idHashTable<Type>::Get( const char *key, Type **value ) const {
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hashnode_s *node;
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int hash, s;
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hash = GetHash( key );
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for( node = heads[ hash ]; node != NULL; node = node->next ) {
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s = node->key.Cmp( key );
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if ( s == 0 ) {
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if ( value ) {
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*value = &node->value;
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}
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return true;
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}
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if ( s > 0 ) {
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break;
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}
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}
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if ( value ) {
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*value = NULL;
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}
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return false;
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}
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/*
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================
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idHashTable<Type>::GetIndex
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the entire contents can be itterated over, but note that the
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exact index for a given element may change when new elements are added
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================
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*/
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template< class Type >
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ID_INLINE Type *idHashTable<Type>::GetIndex( int index ) const {
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hashnode_s *node;
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int count;
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int i;
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if ( ( index < 0 ) || ( index > numentries ) ) {
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assert( 0 );
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return NULL;
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}
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count = 0;
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for( i = 0; i < tablesize; i++ ) {
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for( node = heads[ i ]; node != NULL; node = node->next ) {
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if ( count == index ) {
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return &node->value;
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}
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count++;
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}
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}
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return NULL;
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}
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/*
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================
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idHashTable<Type>::Remove
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================
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*/
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template< class Type >
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ID_INLINE bool idHashTable<Type>::Remove( const char *key ) {
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hashnode_s **head;
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hashnode_s *node;
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hashnode_s *prev;
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int hash;
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hash = GetHash( key );
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head = &heads[ hash ];
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if ( *head ) {
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for( prev = NULL, node = *head; node != NULL; prev = node, node = node->next ) {
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if ( node->key == key ) {
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if ( prev ) {
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prev->next = node->next;
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} else {
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*head = node->next;
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}
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delete node;
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numentries--;
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return true;
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}
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}
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}
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return false;
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}
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/*
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================
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idHashTable<Type>::Clear
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================
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*/
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template< class Type >
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ID_INLINE void idHashTable<Type>::Clear( void ) {
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int i;
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hashnode_s *node;
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hashnode_s *next;
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for( i = 0; i < tablesize; i++ ) {
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next = heads[ i ];
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while( next != NULL ) {
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node = next;
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next = next->next;
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delete node;
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}
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heads[ i ] = NULL;
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}
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numentries = 0;
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}
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/*
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================
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idHashTable<Type>::DeleteContents
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================
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*/
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template< class Type >
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ID_INLINE void idHashTable<Type>::DeleteContents( void ) {
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int i;
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hashnode_s *node;
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hashnode_s *next;
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for( i = 0; i < tablesize; i++ ) {
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next = heads[ i ];
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while( next != NULL ) {
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node = next;
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next = next->next;
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delete node->value;
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delete node;
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}
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heads[ i ] = NULL;
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}
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numentries = 0;
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}
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/*
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================
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idHashTable<Type>::Num
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================
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*/
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template< class Type >
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ID_INLINE int idHashTable<Type>::Num( void ) const {
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return numentries;
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}
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#if defined(ID_TYPEINFO)
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#define __GNUC__ 99
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#endif
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#if !defined(__GNUC__) || __GNUC__ < 4
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/*
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================
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idHashTable<Type>::GetSpread
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================
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*/
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template< class Type >
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int idHashTable<Type>::GetSpread( void ) const {
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int i, average, error, e;
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hashnode_s *node;
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// if no items in hash
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if ( !numentries ) {
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return 100;
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}
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average = numentries / tablesize;
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error = 0;
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for ( i = 0; i < tablesize; i++ ) {
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numItems = 0;
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for( node = heads[ i ]; node != NULL; node = node->next ) {
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numItems++;
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}
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e = abs( numItems - average );
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if ( e > 1 ) {
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error += e - 1;
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}
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}
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return 100 - (error * 100 / numentries);
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}
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#endif
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#if defined(ID_TYPEINFO)
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#undef __GNUC__
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#endif
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#endif /* !__HASHTABLE_H__ */
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