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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.
*
* $URL$
* $Id$
*
*/
#include "sci/engine/intmap.h"
namespace Sci {
#define HASH(x) (x & 0xff)
IntMapper::IntMapper() {
base_value = 0;
memset(nodes, 0, sizeof(nodes));
holes = 0;
}
void IntMapper::free_node_recursive(Node *node) {
if (node) {
free_node_recursive(node->next);
node->next = 0;
free(node);
}
}
IntMapper::~IntMapper() {
int i;
for (i = 0; i < DCS_INT_HASH_MAX; i++)
free_node_recursive(nodes[i]);
free_node_recursive(holes);
// Trigger problems for people who forget to loose the reference
base_value = -42000;
}
int IntMapper::checkKey(int key, bool add, bool *was_added) {
Node **node = &(nodes[HASH(key)]);
while (*node && (key != (*node)->key))
node = &((*node)->next);
if (was_added)
*was_added = false;
if (*node) {
return (*node)->idx;
}
// Not found
if (!add)
return -1;
if (was_added)
*was_added = true;
if (holes) { // Re-use old node
(*node) = holes;
holes = (*node)->next;
(*node)->next = NULL;
(*node)->key = key;
} else {
*node = (Node*)malloc(sizeof(Node));
(*node)->key = key;
(*node)->idx = base_value++;
(*node)->next = NULL;
}
return (*node)->idx;
}
int IntMapper::removeKey(int key) {
Node **node = &(nodes[HASH(key)]);
while (*node && (key != (*node)->key))
node = &((*node)->next);
if (*node) {
Node *oldnode = *node;
*node = (*node)->next;
oldnode->next = holes; // Old node is now a 'hole'
holes = oldnode;
return oldnode->key;
} else
return -1; // Not found
}
} // End of namespace Sci
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