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queuearray: make _find() find the value if no compare function is provided

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Allow NULL as compare function for direct value lookup.

https://bugzilla.gnome.org/show_bug.cgi?id=692691
This commit is contained in:
Tim-Philipp Müller 2013-01-30 11:55:18 +00:00
parent 8ea19a48ce
commit ae8940e6f7
1 changed files with 22 additions and 7 deletions
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29
libs/gst/base/gstqueuearray.c
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@ -287,11 +287,17 @@ gst_queue_array_drop_element (GstQueueArray * array, guint idx)
/**
* gst_queue_array_find:
* @array: a #GstQueueArray object
* @func: comparison function
* @func: (allow-none): comparison function, or %NULL to find @data by value
* @data: data for comparison function
*
* Finds an element in the queue @array by comparing every element
* with @func and returning the index of the found element.
* Finds an element in the queue @array, either by comparing every element
* with @func or by looking up @data if no compare function @func is provided,
* and returning the index of the found element.
*
* Note that the index is not 0-based, but an internal index number with a
* random offset. The index can be used in connection with
* gst_queue_array_drop_element(). FIXME: return index 0-based and make
* _drop_element() take a 0-based index.
*
* Returns: Index of the found element or -1 if nothing was found.
*
@ -302,10 +308,19 @@ gst_queue_array_find (GstQueueArray * array, GCompareFunc func, gpointer data)
{
guint i;
/* Scan from head to tail */
for (i = 0; i < array->length; i++)
if (func (array->array[(i + array->head) % array->size], data) == 0)
return (i + array->head) % array->size;
if (func != NULL) {
/* Scan from head to tail */
for (i = 0; i < array->length; i++) {
if (func (array->array[(i + array->head) % array->size], data) == 0)
return (i + array->head) % array->size;
}
} else {
for (i = 0; i < array->length; i++) {
if (array->array[(i + array->head) % array->size] == data)
return (i + array->head) % array->size;
}
}
return -1;
}