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https://github.com/dhewm/dhewm3.git
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736ec20d4d
Don't include the lazy precompiled.h everywhere, only what's required for the compilation unit. platform.h needs to be included instead to provide all essential defines and types. All includes use the relative path to the neo or the game specific root. Move all idlib related includes from idlib/Lib.h to precompiled.h. precompiled.h still exists for the MFC stuff in tools/. Add some missing header guards.
407 lines
8.8 KiB
C++
407 lines
8.8 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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#include "idlib/math/Math.h"
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#include "idlib/Str.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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