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authormarha <marha@users.sourceforge.net>2012-04-20 17:07:15 +0200
committermarha <marha@users.sourceforge.net>2012-04-20 17:07:15 +0200
commit0e3699334faf92f508b6c187a261548b656b0dd3 (patch)
tree28d7e84df7b54a3e6f85bf83e38efba937288fd3 /xorg-server/Xext/hashtable.h
parentc1194ccd395fdbb23c9ab56bc340ee20a5feeb82 (diff)
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fontconfig libX11 mesa pixman xserver git update 20 april 2012
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+#ifndef HASHTABLE_H
+#define HASHTABLE_H 1
+
+#include <dix-config.h>
+#include <X11/Xfuncproto.h>
+#include <X11/Xdefs.h>
+#include "list.h"
+
+/** @brief A hashing function.
+
+ @param[in/out] cdata Opaque data that can be passed to HtInit that will
+ eventually end up here
+ @param[in] ptr The data to be hashed. The size of the data, if
+ needed, can be configured via a record that can be
+ passed via cdata.
+ @param[in] numBits The number of bits this hash needs to have in the
+ resulting hash
+
+ @return A numBits-bit hash of the data
+*/
+typedef unsigned (*HashFunc)(void * cdata, const void * ptr, int numBits);
+
+/** @brief A comparison function for hashed keys.
+
+ @param[in/out] cdata Opaque data that ca be passed to Htinit that will
+ eventually end up here
+ @param[in] l The left side data to be compared
+ @param[in] r The right side data to be compared
+
+ @return -1 if l < r, 0 if l == r, 1 if l > r
+*/
+typedef int (*HashCompareFunc)(void * cdata, const void * l, const void * r);
+
+struct HashTableRec;
+
+typedef struct HashTableRec *HashTable;
+
+/** @brief A configuration for HtGenericHash */
+typedef struct {
+ int keySize;
+} HtGenericHashSetupRec, *HtGenericHashSetupPtr;
+
+/** @brief ht_create initalizes a hash table for a certain hash table
+ configuration
+
+ @param[out] ht The hash table structure to initialize
+ @param[in] keySize The key size in bytes
+ @param[in] dataSize The data size in bytes
+ @param[in] hash The hash function to use for hashing keys
+ @param[in] compare The comparison function for hashing keys
+ @param[in] cdata Opaque data that will be passed to hash and
+ comparison functions
+*/
+extern _X_EXPORT HashTable ht_create(int keySize,
+ int dataSize,
+ HashFunc hash,
+ HashCompareFunc compare,
+ pointer cdata);
+/** @brief HtDestruct deinitializes the structure. It does not free the
+ memory allocated to HashTableRec
+*/
+extern _X_EXPORT void ht_destroy(HashTable ht);
+
+/** @brief Adds a new key to the hash table. The key will be copied
+ and a pointer to the value will be returned. The data will
+ be initialized with zeroes.
+
+ @param[in/out] ht The hash table
+ @param[key] key The key. The contents of the key will be copied.
+
+ @return On error NULL is returned, otherwise a pointer to the data
+ associated with the newly inserted key.
+
+ @note If dataSize is 0, a pointer to the end of the key may be returned
+ to avoid returning NULL. Obviously the data pointed cannot be
+ modified, as implied by dataSize being 0.
+*/
+extern _X_EXPORT pointer ht_add(HashTable ht, pointer key);
+
+/** @brief Removes a key from the hash table along with its
+ associated data, which will be free'd.
+*/
+extern _X_EXPORT void ht_remove(HashTable ht, pointer key);
+
+/** @brief Finds the associated data of a key from the hash table.
+
+ @return If the key cannot be found, the function returns NULL.
+ Otherwise it returns a pointer to the data associated
+ with the key.
+
+ @note If dataSize == 0, this function may return NULL
+ even if the key has been inserted! If dataSize == NULL,
+ use HtMember instead to determine if a key has been
+ inserted.
+*/
+extern _X_EXPORT pointer ht_find(HashTable ht, pointer key);
+
+/** @brief A generic hash function */
+extern _X_EXPORT unsigned ht_generic_hash(void *cdata,
+ const void *ptr,
+ int numBits);
+
+/** @brief A generic comparison function. It compares data byte-wise. */
+extern _X_EXPORT int ht_generic_compare(void *cdata,
+ const void *l,
+ const void *r);
+
+/** @brief A debugging function that dumps the distribution of the
+ hash table: for each bucket, list the number of elements
+ contained within. */
+extern _X_EXPORT void ht_dump_distribution(HashTable ht);
+
+/** @brief A debugging function that dumps the contents of the hash
+ table: for each bucket, list the elements contained
+ within. */
+extern _X_EXPORT void ht_dump_contents(HashTable ht,
+ void (*print_key)(void *opaque, void *key),
+ void (*print_value)(void *opaque, void *value),
+ void* opaque);
+
+/** @brief A hashing function to be used for hashing resource IDs when
+ used with HashTables. It makes no use of cdata, so that can
+ be NULL. It uses HashXID underneath, and should HashXID be
+ unable to hash the value, it switches into using the generic
+ hash function. */
+extern _X_EXPORT unsigned ht_resourceid_hash(void *cdata,
+ const void * data,
+ int numBits);
+
+/** @brief A comparison function to be used for comparing resource
+ IDs when used with HashTables. It makes no use of cdata,
+ so that can be NULL. */
+extern _X_EXPORT int ht_resourceid_compare(void *cdata,
+ const void *a,
+ const void *b);
+
+#endif // HASHTABLE_H