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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
* soup-path-map.c: URI path prefix-matcher
*
* Copyright (C) 2007 Novell, Inc.
*/
#include <string.h>
#include "soup-path-map.h"
/* This could be replaced with something more clever, like a Patricia
* trie, but it's probably not worth it since the total number of
* mappings is likely to always be small. So we keep an array of
* paths, sorted by decreasing length. (The first prefix match will
* therefore be the longest.)
*/
typedef struct {
char *path;
int len;
gpointer data;
} SoupPathMapping;
struct SoupPathMap {
GArray *mappings;
GDestroyNotify free_func;
};
/**
* soup_path_map_new:
* @data_free_func: function to use to free data added with
* soup_path_map_add().
*
* Creates a new %SoupPathMap.
*
* Return value: the new %SoupPathMap
**/
SoupPathMap *
soup_path_map_new (GDestroyNotify data_free_func)
{
SoupPathMap *map;
map = g_slice_new0 (SoupPathMap);
map->mappings = g_array_new (FALSE, FALSE, sizeof (SoupPathMapping));
map->free_func = data_free_func;
return map;
}
/**
* soup_path_map_free:
* @map: a %SoupPathMap
*
* Frees @map and all data stored in it.
**/
void
soup_path_map_free (SoupPathMap *map)
{
SoupPathMapping *mappings = (SoupPathMapping *)map->mappings->data;
int i;
for (i = 0; i < map->mappings->len; i++) {
g_free (mappings[i].path);
if (map->free_func)
map->free_func (mappings[i].data);
}
g_array_free (map->mappings, TRUE);
g_slice_free (SoupPathMap, map);
}
/* Scan @map looking for @path or one of its ancestors.
* Sets *@match to the index of a match, or -1 if no match is found.
* Sets *@insert to the index to insert @path at if a new mapping is
* desired. Returns %TRUE if *@match is an exact match.
*/
static gboolean
mapping_lookup (SoupPathMap *map, const char *path, int *match, int *insert)
{
SoupPathMapping *mappings = (SoupPathMapping *)map->mappings->data;
int i, path_len;
gboolean exact = FALSE;
*match = -1;
path_len = strcspn (path, "?");
for (i = 0; i < map->mappings->len; i++) {
if (mappings[i].len > path_len)
continue;
if (insert && mappings[i].len < path_len) {
*insert = i;
/* Clear insert so we don't try to set it again */
insert = NULL;
}
if (!strncmp (mappings[i].path, path, mappings[i].len)) {
*match = i;
if (path_len == mappings[i].len)
exact = TRUE;
if (!insert)
return exact;
}
}
if (insert)
*insert = i;
return exact;
}
/**
* soup_path_map_add:
* @map: a %SoupPathMap
* @path: the path
* @data: the data
*
* Adds @data to @map at @path. If there was already data at @path it
* will be freed.
**/
void
soup_path_map_add (SoupPathMap *map, const char *path, gpointer data)
{
SoupPathMapping *mappings = (SoupPathMapping *)map->mappings->data;
int match, insert;
if (mapping_lookup (map, path, &match, &insert)) {
if (map->free_func)
map->free_func (mappings[match].data);
mappings[match].data = data;
} else {
SoupPathMapping mapping;
mapping.path = g_strdup (path);
mapping.len = strlen (path);
mapping.data = data;
g_array_insert_val (map->mappings, insert, mapping);
}
}
/**
* soup_path_map_remove:
* @map: a %SoupPathMap
* @path: the path
*
* Removes @data from @map at @path. (This must be called with the same
* path the data was originally added with, not a subdirectory.)
**/
void
soup_path_map_remove (SoupPathMap *map, const char *path)
{
SoupPathMapping *mappings = (SoupPathMapping *)map->mappings->data;
int match;
if (!mapping_lookup (map, path, &match, NULL))
return;
if (map->free_func)
map->free_func (mappings[match].data);
g_free (mappings[match].path);
g_array_remove_index (map->mappings, match);
}
/**
* soup_path_map_lookup:
* @map: a %SoupPathMap
* @path: the path
*
* Finds the data associated with @path in @map. If there is no data
* specifically associated with @path, it will return the data for the
* closest parent directory of @path that has data associated with it.
*
* Return value: the data set with soup_path_map_add(), or %NULL if no
* data could be found for @path or any of its ancestors.
**/
gpointer
soup_path_map_lookup (SoupPathMap *map, const char *path)
{
SoupPathMapping *mappings = (SoupPathMapping *)map->mappings->data;
int match;
mapping_lookup (map, path, &match, NULL);
if (match == -1)
return NULL;
else
return mappings[match].data;
}
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