diff -r d0f3a028347a -r 59927b2d3b75 telepathygabble/src/gheap.c --- a/telepathygabble/src/gheap.c Tue Feb 02 01:10:06 2010 +0200 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,158 +0,0 @@ -/* - * Header file for GHeap - * - * Copyright (C) 2006 Nokia Corporation. All rights reserved. - * - * Contact: Olli Salli (Nokia-M/Helsinki) - * - * This library is free software; you can redistribute it and/or - * modify it under the terms of the GNU Lesser General Public - * License as published by the Free Software Foundation; either - * version 2.1 of the License, or (at your option) any later version. - * - * This library 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 - * Lesser General Public License for more details. - * - * You should have received a copy of the GNU Lesser General Public - * License along with this library; if not, write to the Free Software - * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA - */ - -#include -#include "gheap.h" - -#define DEFAULT_SIZE 64 - -struct _GHeap -{ - GPtrArray *data; - GCompareFunc comparator; -}; - - -GHeap * -g_heap_new (GCompareFunc comparator) -{ - GHeap *ret = g_slice_new (GHeap); - g_assert (comparator != NULL); - - ret->data = g_ptr_array_sized_new (DEFAULT_SIZE); - ret->comparator = comparator; - - return ret; -} - -void -g_heap_destroy (GHeap * heap) -{ - g_return_if_fail (heap != NULL); - - g_ptr_array_free (heap->data, TRUE); - g_slice_free (GHeap, heap); -} - -void -g_heap_clear (GHeap *heap) -{ - g_return_if_fail (heap != NULL); - - g_ptr_array_free (heap->data, TRUE); - heap->data = g_ptr_array_sized_new (DEFAULT_SIZE); -} - -#define HEAP_INDEX(heap, index) (g_ptr_array_index ((heap)->data, (index)-1)) - - -void -g_heap_add (GHeap *heap, gpointer element) -{ - guint m; - - g_return_if_fail (heap != NULL); - - g_ptr_array_add (heap->data, element); - m = heap->data->len; - while (m != 1) - { - gpointer parent = HEAP_INDEX (heap, m / 2); - - if (heap->comparator (element, parent) == -1) - { - HEAP_INDEX (heap, m / 2) = element; - HEAP_INDEX (heap, m) = parent; - m /= 2; - } - else - break; - } -} - - -gpointer -g_heap_peek_first (GHeap *heap) -{ - g_return_val_if_fail (heap != NULL, NULL); - - if (heap->data->len > 0) - return HEAP_INDEX (heap, 1); - else - return NULL; -} - - -gpointer -g_heap_extract_first (GHeap * heap) -{ - gpointer ret; - - g_return_val_if_fail (heap != NULL, NULL); - - if (heap->data->len > 0) - { - guint m = heap->data->len; - guint i = 1, j; - ret = HEAP_INDEX (heap, 1); - - HEAP_INDEX (heap, 1) = HEAP_INDEX (heap, m); - - while (i * 2 <= m) - { - /* select the child which is supposed to come FIRST */ - if ((i * 2 + 1 <= m) - && (heap-> - comparator (HEAP_INDEX (heap, i * 2), - HEAP_INDEX (heap, i * 2 + 1)) == 1)) - j = i * 2 + 1; - else - j = i * 2; - - if (heap->comparator (HEAP_INDEX (heap, i), HEAP_INDEX (heap, j)) == - 1) - { - gpointer tmp = HEAP_INDEX (heap, i); - HEAP_INDEX (heap, i) = HEAP_INDEX (heap, j); - HEAP_INDEX (heap, j) = tmp; - i = j; - } - else - break; - } - - g_ptr_array_remove_index (heap->data, m - 1); - } - else - ret = NULL; - - return ret; -} - - -guint -g_heap_size (GHeap *heap) -{ - g_return_val_if_fail (heap != NULL, 0); - - return heap->data->len; -}