summaryrefslogtreecommitdiff
path: root/src/xine-utils/sorted_array.h
diff options
context:
space:
mode:
Diffstat (limited to 'src/xine-utils/sorted_array.h')
-rw-r--r--src/xine-utils/sorted_array.h97
1 files changed, 97 insertions, 0 deletions
diff --git a/src/xine-utils/sorted_array.h b/src/xine-utils/sorted_array.h
new file mode 100644
index 000000000..c5fe1b413
--- /dev/null
+++ b/src/xine-utils/sorted_array.h
@@ -0,0 +1,97 @@
+/*
+ * Copyright (C) 2000-2006 the xine project
+ *
+ * This file is part of xine, a free video player.
+ *
+ * xine 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.
+ *
+ * xine 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ *
+ * $Id: sorted_array.h,v 1.1 2006/01/16 08:04:44 tmattern Exp $
+ *
+ * Sorted array which grows automatically when you add elements.
+ * A binary search is used to find the position of a new element.
+ *
+ * Example:
+ * Let's create de comparison method for integers:
+ *
+ * int int_comparator(void *a, void *b) {
+ * if ((int)a < (int)b) {
+ * return -1;
+ * } else if ((int)a == (int)b) {
+ * return 0;
+ * } else {
+ * return 1;
+ * }
+ * }
+ *
+ * Create a sorted array for integers:
+ * xine_sarray_t *sarray = xine_sarray_new(10, int_comparator);
+ *
+ * Add elements:
+ * xine_sarray_add(sarray, (void*)4);
+ * xine_sarray_add(sarray, (void*)28);
+ * xine_sarray_add(sarray, (void*)7);
+ *
+ * Find an element:
+ * int pos = xine_sarray_binary_search(sarray, (void*)7);
+ * if (pos >= 0)
+ * FOUND
+ * else
+ * NOT FOUND
+ *
+ * Delete the array:
+ * xine_sarray_delete(sarray);
+ *
+ */
+#ifndef XINE_SORTED_ARRAY_H
+#define XINE_SORTED_ARRAY_H
+
+#include "array.h"
+
+/* Array type */
+typedef struct xine_sarray_s xine_sarray_t;
+
+/* Array element comparator */
+typedef int (*xine_sarray_comparator_t)(void*, void*);
+
+/* Constructor */
+xine_sarray_t *xine_sarray_new(size_t initial_size, xine_sarray_comparator_t comparator);
+
+/* Destructor */
+void xine_sarray_delete(xine_sarray_t *sarray);
+
+/* Returns the number of element stored in the array */
+size_t xine_sarray_size(xine_sarray_t *sarray);
+
+/* Removes all elements from an array */
+void xine_sarray_clear(xine_sarray_t *sarray);
+
+/* Adds the element into the array
+ Returns the insertion position */
+int xine_sarray_add(xine_sarray_t *sarray, void *value);
+
+/* Removes one element from an array at the position specified */
+void xine_sarray_remove(xine_sarray_t *sarray, unsigned int position);
+
+/* Get the element at the position specified */
+void *xine_sarray_get(xine_sarray_t *sarray, unsigned int position);
+
+/* Returns the index of the search key, if it is contained in the list.
+ Otherwise, (-(insertion point) - 1) or ~(insertion point).
+ The insertion point is defined as the point at which the key would be
+ inserted into the array. */
+int xine_sarray_binary_search(xine_sarray_t *sarray, void *key);
+
+#endif
+