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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* $URL$
* $Id$
*
*/
#ifndef INT_HASHMAP_H
#define INT_HASHMAP_H
#include "common/scummsys.h"
/*
* Defines a hash map that maps values to small integers.
* The name "hashmap" here is a bit misleading, because the
* value associated to each key are generated automatically,
* using the lowest "unused" value.
*/
// Assumes that the ints are relatively evenly distributed
#define DCS_INT_HASH_MAX 255
struct int_hash_map_t {
struct node_t {
int name;
int value;
node_t *next;
};
int base_value; // Starts at zero, counts upwards
node_t *nodes[DCS_INT_HASH_MAX + 1];
node_t *holes; /* List of freed entries to minimize
** memory operations and modifications
** to base_value */
void free_node_recursive(node_t *node);
public:
int_hash_map_t();
~int_hash_map_t();
/**
* Checks whether a value is in the map, adds it if neccessary.
* @param value The value to check for/add
* @param add Whether to add the value if it's not in there
* @param was_added Set to non-zero iff the value is new, ignored if NULL.
* @return The new (or old) index, or -1 if add was zero and
* the value couldn't be found
*/
int check_value(int value, bool add, char *was_added = 0);
/**
* Removes a value from the hash map.
* @param value The value to remove
* @return The ID of the value, or -1 if it wasn't present
*/
int remove_value(int value);
};
typedef int_hash_map_t *int_hash_map_ptr;
#endif // INT_HASHMAP_H
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