/*
This file is part of GNUnet.
- (C) 2001, 2002, 2003, 2004, 2005, 2006, 2008, 2009 Christian Grothoff (and other contributing authors)
+ (C) 2001, 2002, 2003, 2004, 2005, 2006, 2008, 2009, 2010 Christian Grothoff (and other contributing authors)
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
*/
struct GNUNET_CONTAINER_MetaData;
-/**
- * Iterator over meta data.
- *
- * @param cls closure
- * @param type type of the meta data
- * @param data value of the meta data
- * @return GNUNET_OK to continue to iterate, GNUNET_SYSERR to abort
- */
-typedef int (*GNUNET_CONTAINER_MetaDataProcessor) (void *cls,
- EXTRACTOR_KeywordType type,
- const char *data);
-
/**
* Create a fresh MetaData token.
*
* @return empty meta-data container
*/
-struct GNUNET_CONTAINER_MetaData *GNUNET_CONTAINER_meta_data_create (void);
+struct GNUNET_CONTAINER_MetaData *
+GNUNET_CONTAINER_meta_data_create (void);
/**
* Duplicate a MetaData token.
*
- * @param meta what to duplicate
+ * @param md what to duplicate
* @return duplicate meta-data container
*/
-struct GNUNET_CONTAINER_MetaData *GNUNET_CONTAINER_meta_data_duplicate (const
- struct
- GNUNET_CONTAINER_MetaData
- *meta);
+struct GNUNET_CONTAINER_MetaData *
+GNUNET_CONTAINER_meta_data_duplicate (const struct
+ GNUNET_CONTAINER_MetaData *md);
/**
* Free meta data.
*
* @param md what to free
*/
-void GNUNET_CONTAINER_meta_data_destroy (struct GNUNET_CONTAINER_MetaData
- *md);
+void
+GNUNET_CONTAINER_meta_data_destroy (struct GNUNET_CONTAINER_MetaData *md);
/**
- * Test if two MDs are equal.
+ * Test if two MDs are equal. We consider them equal if
+ * the meta types, formats and content match (we do not
+ * include the mime types and plugins names in this
+ * consideration).
*
* @param md1 first value to check
* @param md2 other value to check
* @return GNUNET_YES if they are equal
*/
-int GNUNET_CONTAINER_meta_data_test_equal (const struct
- GNUNET_CONTAINER_MetaData *md1,
- const struct
- GNUNET_CONTAINER_MetaData *md2);
+int
+GNUNET_CONTAINER_meta_data_test_equal (const struct
+ GNUNET_CONTAINER_MetaData *md1,
+ const struct
+ GNUNET_CONTAINER_MetaData *md2);
/**
* Extend metadata.
*
* @param md metadata to extend
- * @param type type of the new entry
- * @param data value for the entry
+ * @param plugin_name name of the plugin that produced this value;
+ * special values can be used (i.e. '<zlib>' for zlib being
+ * used in the main libextractor library and yielding
+ * meta data).
+ * @param type libextractor-type describing the meta data
+ * @param format basic format information about data
+ * @param data_mime_type mime-type of data (not of the original file);
+ * can be NULL (if mime-type is not known)
+ * @param data actual meta-data found
+ * @param data_len number of bytes in data
* @return GNUNET_OK on success, GNUNET_SYSERR if this entry already exists
+ * data_mime_type and plugin_name are not considered for "exists" checks
+ */
+int
+GNUNET_CONTAINER_meta_data_insert (struct GNUNET_CONTAINER_MetaData *md,
+ const char *plugin_name,
+ enum EXTRACTOR_MetaType type,
+ enum EXTRACTOR_MetaFormat format,
+ const char *data_mime_type,
+ const char *data,
+ size_t data_len);
+
+
+/**
+ * Extend metadata. Merges the meta data from the second argument
+ * into the first, discarding duplicate key-value pairs.
+ *
+ * @param md metadata to extend
+ * @param in metadata to merge
*/
-int GNUNET_CONTAINER_meta_data_insert (struct GNUNET_CONTAINER_MetaData *md,
- EXTRACTOR_KeywordType type,
- const char *data);
+void
+GNUNET_CONTAINER_meta_data_merge (struct GNUNET_CONTAINER_MetaData *md,
+ const struct GNUNET_CONTAINER_MetaData *in);
+
/**
* Remove an item.
*
+ * @param md metadata to manipulate
* @param type type of the item to remove
* @param data specific value to remove, NULL to remove all
* entries of the given type
+ * @param data_len number of bytes in data
* @return GNUNET_OK on success, GNUNET_SYSERR if the item does not exist in md
*/
-int GNUNET_CONTAINER_meta_data_delete (struct GNUNET_CONTAINER_MetaData *md,
- EXTRACTOR_KeywordType type,
- const char *data);
+int
+GNUNET_CONTAINER_meta_data_delete (struct GNUNET_CONTAINER_MetaData *md,
+ enum EXTRACTOR_MetaType type,
+ const char *data,
+ size_t data_len);
+
+
+/**
+ * Remove all items in the container.
+ *
+ * @param md metadata to manipulate
+ */
+void
+GNUNET_CONTAINER_meta_data_clear (struct GNUNET_CONTAINER_MetaData *md);
+
/**
* Add the current time as the publication date
*
* @param md metadata to modify
*/
-void GNUNET_CONTAINER_meta_data_add_publication_date (struct
- GNUNET_CONTAINER_MetaData
- *md);
+void
+GNUNET_CONTAINER_meta_data_add_publication_date (struct
+ GNUNET_CONTAINER_MetaData
+ *md);
+
/**
- * Iterate over MD entries, excluding thumbnails.
+ * Iterate over MD entries.
*
* @param md metadata to inspect
* @param iter function to call on each entry
* @param iter_cls closure for iterator
* @return number of entries
*/
-int GNUNET_CONTAINER_meta_data_get_contents (const struct
- GNUNET_CONTAINER_MetaData *md,
- GNUNET_CONTAINER_MetaDataProcessor
- iter, void *iter_cls);
+int GNUNET_CONTAINER_meta_data_iterate (const struct
+ GNUNET_CONTAINER_MetaData *md,
+ EXTRACTOR_MetaDataProcessor
+ iter, void *iter_cls);
/**
- * Get the first MD entry of the given type.
+ * Get the first MD entry of the given type. Caller
+ * is responsible for freeing the return value.
+ * Also, only meta data items that are strings (0-terminated)
+ * are returned by this function.
*
* @param md metadata to inspect
* @param type type to look for
- * @return NULL if we do not have any such entry,
- * otherwise client is responsible for freeing the value!
+ * @return NULL if no entry was found
*/
-char *GNUNET_CONTAINER_meta_data_get_by_type (const struct
- GNUNET_CONTAINER_MetaData *md,
- EXTRACTOR_KeywordType type);
+char *
+GNUNET_CONTAINER_meta_data_get_by_type (const struct
+ GNUNET_CONTAINER_MetaData *md,
+ enum EXTRACTOR_MetaType type);
+
/**
- * Get the first matching MD entry of the given types.
+ * Get the first matching MD entry of the given types. Caller is
+ * responsible for freeing the return value. Also, only meta data
+ * items that are strings (0-terminated) are returned by this
+ * function.
*
* @param md metadata to inspect
* @param ... -1-terminated list of types
* @return NULL if we do not have any such entry,
* otherwise client is responsible for freeing the value!
*/
-char *GNUNET_CONTAINER_meta_data_get_first_by_types (const struct
- GNUNET_CONTAINER_MetaData
- *md, ...);
+char *
+GNUNET_CONTAINER_meta_data_get_first_by_types (const struct
+ GNUNET_CONTAINER_MetaData
+ *md, ...);
/**
- * Get a thumbnail from the meta-data (if present).
+ * Get a thumbnail from the meta-data (if present). Only matches meta
+ * data with mime type "image" and binary format.
*
* @param md metadata to inspect
* @param thumb will be set to the thumbnail data. Must be
* freed by the caller!
* @return number of bytes in thumbnail, 0 if not available
*/
-size_t GNUNET_CONTAINER_meta_data_get_thumbnail (const struct
- GNUNET_CONTAINER_MetaData
- *md, unsigned char **thumb);
+size_t
+GNUNET_CONTAINER_meta_data_get_thumbnail (const struct
+ GNUNET_CONTAINER_MetaData
+ *md, unsigned char **thumb);
-/**
- * Extract meta-data from a file.
- *
- * @param md metadata to set
- * @param filename name of file to inspect
- * @param extractors plugins to use
- * @return GNUNET_SYSERR on error, otherwise the number
- * of meta-data items obtained
- */
-int GNUNET_CONTAINER_meta_data_extract_from_file (struct
- GNUNET_CONTAINER_MetaData
- *md, const char *filename,
- EXTRACTOR_ExtractorList *
- extractors);
/**
* Serialize meta-data to target.
*
* @param md metadata to serialize
- * @param size maximum number of bytes available
+ * @param target where to write the serialized metadata;
+ * *target can be NULL, in which case memory is allocated
+ * @param max maximum number of bytes available
* @param opt is it ok to just write SOME of the
* meta-data to match the size constraint,
* possibly discarding some data?
*/
ssize_t GNUNET_CONTAINER_meta_data_serialize (const struct
GNUNET_CONTAINER_MetaData *md,
- char *target,
- size_t size,
+ char **target,
+ size_t max,
enum
GNUNET_CONTAINER_MetaDataSerializationOptions
opt);
+
/**
- * Compute size of the meta-data in
- * serialized form.
+ * Get the size of the full meta-data in serialized form.
*
* @param md metadata to inspect
- * @param opt is it ok to just write SOME of the
- * meta-data to match the size constraint,
- * possibly discarding some data?
* @return number of bytes needed for serialization, -1 on error
*/
ssize_t GNUNET_CONTAINER_meta_data_get_serialized_size (const struct
GNUNET_CONTAINER_MetaData
- *md,
- enum
- GNUNET_CONTAINER_MetaDataSerializationOptions
- opt);
+ *md);
+
/**
* Deserialize meta-data. Initializes md.
*GNUNET_CONTAINER_meta_data_deserialize (const char *input,
size_t size);
-/**
- * Does the meta-data claim that this is a directory?
- * Checks if the mime-type is that of a GNUnet directory.
- *
- * @param md metadata to inspect
- * @return GNUNET_YES if it is, GNUNET_NO if it is not, GNUNET_SYSERR if
- * we have no mime-type information (treat as 'GNUNET_NO')
- */
-int GNUNET_CONTAINER_meta_data_test_for_directory (const struct
- GNUNET_CONTAINER_MetaData
- *md);
-
/* ******************************* HashMap **************************** */
*/
enum GNUNET_CONTAINER_MultiHashMapOption
{
+
/**
- * If a value with the given key exists, replace it.
- * Note that the old value would NOT be freed
- * by replace (the application has to make sure that
- * this happens if required).
+ * If a value with the given key exists, replace it. Note that the
+ * old value would NOT be freed by replace (the application has to
+ * make sure that this happens if required).
*/
GNUNET_CONTAINER_MULTIHASHMAPOPTION_REPLACE,
GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE,
/**
- * There must only be one value per key; storing
- * a value should fail if a value under the same
- * key already exists.
+ * There must only be one value per key; storing a value should fail
+ * if a value under the same key already exists.
*/
GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY,
/**
- * There must only be one value per key, but don't
- * bother checking if a value already exists
- * (faster than UNIQUE_ONLY; implemented just like
- * MULTIPLE but this option documents better what
- * is intended if UNIQUE is what is desired).
+ * There must only be one value per key, but don't bother checking
+ * if a value already exists (faster than UNIQUE_ONLY; implemented
+ * just like MULTIPLE but this option documents better what is
+ * intended if UNIQUE is what is desired).
*/
GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST
};
/**
- * Iterator over HashCodes.
+ * Iterator over hash map entries.
*
* @param cls closure
* @param key current key code
struct GNUNET_CONTAINER_MultiHashMap
*GNUNET_CONTAINER_multihashmap_create (unsigned int len);
+
/**
* Destroy a hash map. Will not free any values
* stored in the hash map!
GNUNET_CONTAINER_MultiHashMap
*map);
+
/**
- * Given a key find a value in the
- * map matching the key.
+ * Given a key find a value in the map matching the key.
*
* @param map the map
* @param key what to look for
GNUNET_CONTAINER_MultiHashMap *map,
const GNUNET_HashCode * key);
+
/**
- * Remove the given key-value pair from the map.
- * Note that if the key-value pair is in the map
- * multiple times, only one of the pairs will be
- * removed.
+ * Remove the given key-value pair from the map. Note that if the
+ * key-value pair is in the map multiple times, only one of the pairs
+ * will be removed.
*
* @param map the map
* @param key key of the key-value pair
*map,
const GNUNET_HashCode * key);
+
/**
* Check if the map contains any value under the given
* key (including values that are NULL).
*map,
const GNUNET_HashCode * key);
+
/**
* Store a key-value pair in the map.
*
* Iterate over all entries in the map.
*
* @param map the map
- * @param iterator function to call on each entry
- * @param cls extra argument to it
+ * @param it function to call on each entry
+ * @param it_cls extra argument to it
* @return the number of key value pairs processed,
* GNUNET_SYSERR if it aborted iteration
*/
int GNUNET_CONTAINER_multihashmap_iterate (const struct
GNUNET_CONTAINER_MultiHashMap *map,
GNUNET_CONTAINER_HashMapIterator
- iterator, void *cls);
+ it, void *it_cls);
+
/**
- * Iterate over all entries in the map
- * that match a particular key.
+ * Iterate over all entries in the map that match a particular key.
*
* @param map the map
* @param key key that the entries must correspond to
- * @param iterator function to call on each entry
- * @param cls extra argument to it
+ * @param it function to call on each entry
+ * @param it_cls extra argument to it
* @return the number of key value pairs processed,
* GNUNET_SYSERR if it aborted iteration
*/
*map,
const GNUNET_HashCode * key,
GNUNET_CONTAINER_HashMapIterator
- iterator, void *cls);
-/**
- * Returns the stored value of a random non-null entry
- * in the hash table. Returns only the first value, does
- * not go inside bucket linked list (yet). Runs with a
- * worst case time of N, so it's not efficient in any way
- * shape or form!!!!.
- */
-void *GNUNET_CONTAINER_multihashmap_get_random (const struct
- GNUNET_CONTAINER_MultiHashMap
- *map);
-
-
+ it, void *it_cls);
/* ******************** doubly-linked list *************** */
/**
- * Insert an element into a DLL. Assumes
- * that head, tail and element are structs
- * with prev and next fields.
+ * Insert an element at the head of a DLL. Assumes that head, tail and
+ * element are structs with prev and next fields.
*
* @param head pointer to the head of the DLL
* @param tail pointer to the tail of the DLL
* @param element element to insert
*/
-#define GNUNET_CONTAINER_DLL_insert(head,tail,element) \
+#define GNUNET_CONTAINER_DLL_insert(head,tail,element) do { \
(element)->next = (head); \
(element)->prev = NULL; \
if ((tail) == NULL) \
(tail) = element; \
else \
(head)->prev = element; \
- (head) = (element);
+ (head) = (element); } while (0)
/**
- * Insert an element into a DLL after the given other
- * element. Insert at the head if the other
- * element is NULL.
+ * Insert an element into a DLL after the given other element. Insert
+ * at the head if the other element is NULL.
*
* @param head pointer to the head of the DLL
* @param tail pointer to the tail of the DLL
* @param other prior element, NULL for insertion at head of DLL
* @param element element to insert
*/
-#define GNUNET_CONTAINER_DLL_insert_after(head,tail,other,element) \
+#define GNUNET_CONTAINER_DLL_insert_after(head,tail,other,element) do { \
(element)->prev = (other); \
if (NULL == other) \
{ \
if (NULL == (element)->next) \
(tail) = (element); \
else \
- (element)->next->prev = (element);
+ (element)->next->prev = (element); } while (0)
* @param tail pointer to the tail of the DLL
* @param element element to remove
*/
-#define GNUNET_CONTAINER_DLL_remove(head,tail,element) \
+#define GNUNET_CONTAINER_DLL_remove(head,tail,element) do { \
if ((element)->prev == NULL) \
(head) = (element)->next; \
else \
if ((element)->next == NULL) \
(tail) = (element)->prev; \
else \
- (element)->next->prev = (element)->prev;
+ (element)->next->prev = (element)->prev; } while (0)
/**
* Cost by which elements in a heap can be ordered.
*/
-typedef uint64_t GNUNET_CONTAINER_HeapCost;
+typedef uint64_t GNUNET_CONTAINER_HeapCostType;
/*
*/
struct GNUNET_CONTAINER_Heap;
+
+
+/**
+ * Handle to a node in a heap.
+ */
+struct GNUNET_CONTAINER_HeapNode;
+
+
/**
* Create a new heap.
*
- * @param type should the minimum or the maximum element be the root
- * @return NULL on error, otherwise a fresh heap
+ * @param order how should the heap be sorted?
+ * @return handle to the heap
*/
-struct GNUNET_CONTAINER_Heap *GNUNET_CONTAINER_heap_create (enum
- GNUNET_CONTAINER_HeapOrder
- type);
+struct GNUNET_CONTAINER_Heap *
+GNUNET_CONTAINER_heap_create (enum GNUNET_CONTAINER_HeapOrder order);
/**
- * Free a heap
+ * Destroys the heap. Only call on a heap that
+ * is already empty.
*
- * @param h heap to free.
+ * @param heap heap to destroy
*/
-void GNUNET_CONTAINER_heap_destroy (struct GNUNET_CONTAINER_Heap *h);
+void GNUNET_CONTAINER_heap_destroy (struct GNUNET_CONTAINER_Heap *heap);
/**
- * Function called on elements of a heap.
+ * Get element stored at root of heap.
+ *
+ * @param heap heap to inspect
+ * @return NULL if heap is empty
+ */
+void *
+GNUNET_CONTAINER_heap_peek (const struct GNUNET_CONTAINER_Heap *heap);
+
+
+/**
+ * Get the current size of the heap
+ *
+ * @param heap the heap to get the size of
+ * @return number of elements stored
+ */
+unsigned int
+GNUNET_CONTAINER_heap_get_size (const struct GNUNET_CONTAINER_Heap *heap);
+
+
+/**
+ * Iterator for heap
*
* @param cls closure
- * @param element obj stored in heap
- * @param cost cost of the element
+ * @param node internal node of the heap
+ * @param element value stored at the node
+ * @param cost cost associated with the node
* @return GNUNET_YES if we should continue to iterate,
* GNUNET_NO if not.
*/
typedef int (*GNUNET_CONTAINER_HeapIterator) (void *cls,
- void *element,
- GNUNET_CONTAINER_HeapCost cost);
+ struct GNUNET_CONTAINER_HeapNode *node,
+ void *element,
+ GNUNET_CONTAINER_HeapCostType cost);
/**
- * Iterate over all entries in the map.
+ * Iterate over all entries in the heap.
*
* @param heap the heap
* @param iterator function to call on each entry
* @param iterator_cls closure for iterator
- * @return number of items handled
- * GNUNET_SYSERR if iteration was aborted by iterator
*/
-int GNUNET_CONTAINER_heap_iterate (struct GNUNET_CONTAINER_Heap *heap,
- GNUNET_CONTAINER_HeapIterator iterator,
- void *iterator_cls);
+void
+GNUNET_CONTAINER_heap_iterate (const struct GNUNET_CONTAINER_Heap *heap,
+ GNUNET_CONTAINER_HeapIterator iterator,
+ void *iterator_cls);
+/**
+ * Return a *uniform* random element from the heap. Choose a random
+ * number between 0 and heap size and then walk directly to it.
+ * This cost can be between 0 and n, amortized cost of logN.
+ *
+ * @param heap heap to choose random element from
+ * @param max how many nodes from the heap to choose from
+ *
+ * @return data stored at the chosen random node,
+ * NULL if the heap is empty.
+ *
+ */
+void *
+GNUNET_CONTAINER_heap_get_random (struct GNUNET_CONTAINER_Heap *heap, uint32_t max);
/**
- * Inserts a new item into the heap, item is always neighbor now.
- * @param heap the heap
- * @param element element to insert
- * @param cost cost of the element
- * @return FIXME
+ * Perform a random walk of the tree. The walk is biased
+ * towards elements closer to the root of the tree (since
+ * each walk starts at the root and ends at a random leaf).
+ * The heap internally tracks the current position of the
+ * walk.
+ *
+ * @param heap heap to walk
+ * @return data stored at the next random node in the walk;
+ * NULL if the tree is empty.
*/
-int
-GNUNET_CONTAINER_heap_insert (struct GNUNET_CONTAINER_Heap *heap,
- void *element, GNUNET_CONTAINER_HeapCost cost);
+void *
+GNUNET_CONTAINER_heap_walk_get_next (struct GNUNET_CONTAINER_Heap *heap);
/**
- * Removes root of the tree, is remove max if a max heap and remove min
- * if a min heap, returns the data stored at the node.
+ * Inserts a new element into the heap.
*
- * @param heap the heap
- * @return NULL if the heap is empty
+ * @param heap heap to modify
+ * @param element element to insert
+ * @param cost cost for the element
+ * @return node for the new element
*/
-void *GNUNET_CONTAINER_heap_remove_root (struct GNUNET_CONTAINER_Heap *heap);
+struct GNUNET_CONTAINER_HeapNode *
+GNUNET_CONTAINER_heap_insert (struct GNUNET_CONTAINER_Heap *heap,
+ void *element,
+ GNUNET_CONTAINER_HeapCostType cost);
/**
- * Returns element stored at root of tree, doesn't effect anything
+ * Remove root of the heap.
*
- * @param heap the heap
- * @return NULL if the heap is empty
+ * @param heap heap to modify
+ * @return element data stored at the root node
*/
-void *GNUNET_CONTAINER_heap_peek (struct GNUNET_CONTAINER_Heap *heap);
+void *
+GNUNET_CONTAINER_heap_remove_root (struct GNUNET_CONTAINER_Heap *heap);
/**
- * Removes any node from the tree based on the neighbor given, does
- * not traverse the tree (backpointers) but may take more time due to
- * percolation of nodes.
- *
- * @param heap the heap
- * @param element the element to remove
- * @return NULL if "element" was not found in the heap, otherwise element
+ * Removes a node from the heap.
+ *
+ * @param heap heap to modify
+ * @param node node to remove
+ * @return element data stored at the node, NULL if heap is empty
*/
-void *GNUNET_CONTAINER_heap_remove_node (struct GNUNET_CONTAINER_Heap *heap,
- void *element);
+void *
+GNUNET_CONTAINER_heap_remove_node (struct GNUNET_CONTAINER_Heap *heap,
+ struct GNUNET_CONTAINER_HeapNode *node);
/**
* Updates the cost of any node in the tree
*
- * @param heap the heap
- * @param element the element for which the cost is updated
- * @param new_cost new cost for the element
- * @return FIXME
+ * @param heap heap to modify
+ * @param node node for which the cost is to be changed
+ * @param new_cost new cost for the node
*/
-int
+void
GNUNET_CONTAINER_heap_update_cost (struct GNUNET_CONTAINER_Heap *heap,
- void *element,
- GNUNET_CONTAINER_HeapCost new_cost);
+ struct GNUNET_CONTAINER_HeapNode *node,
+ GNUNET_CONTAINER_HeapCostType new_cost);
+
+
+/* ******************** Singly linked list *************** */
+
+/**
+ * Possible ways for how data stored in the linked list
+ * might be allocated.
+ */
+enum GNUNET_CONTAINER_SListDisposition
+ {
+ /**
+ * Single-linked list must copy the buffer.
+ */
+ GNUNET_CONTAINER_SLIST_DISPOSITION_TRANSIENT = 0,
+
+ /**
+ * Data is static, no need to copy or free.
+ */
+ GNUNET_CONTAINER_SLIST_DISPOSITION_STATIC = 2,
+
+ /**
+ * Data is dynamic, do not copy but free when done.
+ */
+ GNUNET_CONTAINER_SLIST_DISPOSITION_DYNAMIC = 4
+ };
+
+
+
+/**
+ * Handle to a singly linked list
+ */
+struct GNUNET_CONTAINER_SList;
+
+/**
+ * Handle to a singly linked list iterator
+ */
+struct GNUNET_CONTAINER_SList_Iterator;
+
+
+/**
+ * Add a new element to the list
+ * @param l list
+ * @param disp memory disposition
+ * @param buf payload buffer
+ * @param len length of the buffer
+ */
+void GNUNET_CONTAINER_slist_add (struct GNUNET_CONTAINER_SList *l,
+ enum GNUNET_CONTAINER_SListDisposition disp,
+ const void *buf, size_t len);
+
+
+/**
+ * Append a singly linked list to another
+ * @param dst list to append to
+ * @param src source
+ */
+void
+GNUNET_CONTAINER_slist_append (struct GNUNET_CONTAINER_SList *dst, struct GNUNET_CONTAINER_SList *src);
+
+
+/**
+ * Create a new singly linked list
+ * @return the new list
+ */
+struct GNUNET_CONTAINER_SList *GNUNET_CONTAINER_slist_create (void);
+
+
+/**
+ * Destroy a singly linked list
+ * @param l the list to be destroyed
+ */
+void GNUNET_CONTAINER_slist_destroy (struct GNUNET_CONTAINER_SList *l);
/**
- * Random walk of the tree, returns the data stored at the next random node
- * in the walk. Calls callee with the data, or NULL if the tree is empty
- * or some other problem crops up.
+ * Return the beginning of a list
*
- * @param heap the heap
- * @return the next element from the random walk
+ * @param l list
+ * @return iterator pointing to the beginning, free using "GNUNET_free"
*/
-void *GNUNET_CONTAINER_heap_walk_get_next (struct GNUNET_CONTAINER_Heap
- *heap);
+struct GNUNET_CONTAINER_SList_Iterator *
+GNUNET_CONTAINER_slist_begin(struct GNUNET_CONTAINER_SList *l);
/**
- * Returns the current size of the heap
+ * Clear a list
*
- * @param heap the heap to get the size of
- * @return number of elements in the heap
+ * @param l list
*/
-unsigned int
-GNUNET_CONTAINER_heap_get_size (struct GNUNET_CONTAINER_Heap *heap);
+void GNUNET_CONTAINER_slist_clear (struct GNUNET_CONTAINER_SList *l);
+
+
+/**
+ * Check if a list contains a certain element
+ * @param l list
+ * @param buf payload buffer to find
+ * @param len length of the payload (number of bytes in buf)
+ */
+int GNUNET_CONTAINER_slist_contains (const struct GNUNET_CONTAINER_SList *l, const void *buf, size_t len);
+
+
+/**
+ * Count the elements of a list
+ * @param l list
+ * @return number of elements in the list
+ */
+int GNUNET_CONTAINER_slist_count (const struct GNUNET_CONTAINER_SList *l);
+
+
+/**
+ * Remove an element from the list
+ * @param i iterator that points to the element to be removed
+ */
+void GNUNET_CONTAINER_slist_erase (struct GNUNET_CONTAINER_SList_Iterator *i);
+
+/**
+ * Insert an element into a list at a specific position
+ * @param before where to insert the new element
+ * @param disp memory disposition
+ * @param buf payload buffer
+ * @param len length of the payload
+ */
+void GNUNET_CONTAINER_slist_insert (struct GNUNET_CONTAINER_SList_Iterator *before,
+ enum GNUNET_CONTAINER_SListDisposition disp,
+ const void *buf,
+ size_t len);
+
+
+/**
+ * Advance an iterator to the next element
+ * @param i iterator
+ * @return GNUNET_YES on success, GNUNET_NO if the end has been reached
+ */
+int GNUNET_CONTAINER_slist_next (struct GNUNET_CONTAINER_SList_Iterator *i);
+
+
+/**
+ * Check if an iterator points beyond the end of a list
+ * @param i iterator
+ * @return GNUNET_YES if the end has been reached, GNUNET_NO if the iterator
+ * points to a valid element
+ */
+int GNUNET_CONTAINER_slist_end (struct GNUNET_CONTAINER_SList_Iterator *i);
+
+
+/**
+ * Retrieve the element at a specific position in a list
+ *
+ * @param i iterator
+ * @param len set to the payload length
+ * @return payload
+ */
+const void *
+GNUNET_CONTAINER_slist_get (const struct GNUNET_CONTAINER_SList_Iterator *i,
+ size_t *len);
+
+
+/**
+ * Release an iterator
+ * @param i iterator
+ */
+void GNUNET_CONTAINER_slist_iter_destroy (struct GNUNET_CONTAINER_SList_Iterator *i);
#if 0 /* keep Emacsens' auto-indent happy */
projects / oweals / gnunet.git / blobdiff