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245 lines
7.8 KiB
C
245 lines
7.8 KiB
C
#ifndef ACL_BINHASH_INCLUDE_H
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#define ACL_BINHASH_INCLUDE_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include "acl_define.h"
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#include "acl_hash.h" /* just for ACL_HASH_FN */
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#include "acl_slice.h"
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#include "acl_iterator.h"
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typedef struct ACL_BINHASH ACL_BINHASH;
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typedef struct ACL_BINHASH_INFO ACL_BINHASH_INFO;
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/**
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* Structure of one hash table.
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*/
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struct ACL_BINHASH {
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int size; /**< length of entries array */
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int used; /**< number of entries in table */
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unsigned int flag; /**< the hash table's properties flag */
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int status; /**< the hash tables' operation status */
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ACL_BINHASH_INFO **data; /**< entries array, auto-resized */
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ACL_SLICE *slice; /**< memory slice */
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ACL_HASH_FN hash_fn; /**< hash function */
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/* for acl_iterator */
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/* 取迭代器头函数 */
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void *(*iter_head)(ACL_ITER*, struct ACL_BINHASH*);
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/* 取迭代器下一个函数 */
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void *(*iter_next)(ACL_ITER*, struct ACL_BINHASH*);
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/* 取迭代器尾函数 */
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void *(*iter_tail)(ACL_ITER*, struct ACL_BINHASH*);
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/* 取迭代器上一个函数 */
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void *(*iter_prev)(ACL_ITER*, struct ACL_BINHASH*);
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/* 取迭代器关联的当前容器成员结构对象 */
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ACL_BINHASH_INFO *(*iter_info)(ACL_ITER*, struct ACL_BINHASH*);
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};
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/**
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* Structure of one hash table entry.
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*/
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struct ACL_BINHASH_INFO {
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union {
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void *key;
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const void *c_key;
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} key; /**
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* 哈希键, 只所以如此声明，是因为当创建哈希表的标志位为
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* ACL_BINHASH_FLAG_KEY_REUSE 时需要复用输入的键空间
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*/
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int key_len; /**< 哈希键长度 */
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void *value; /**< 哈希键所对应的用户数据 */
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struct ACL_BINHASH_INFO *next; /**< colliding entry */
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struct ACL_BINHASH_INFO *prev; /**< colliding entry */
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};
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/**
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* ACL_BINHASH 遍历用类型
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*/
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typedef struct ACL_BINHASH_ITER {
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/* public */
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ACL_BINHASH_INFO *ptr;
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/* private */
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int i;
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int size;
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ACL_BINHASH_INFO **h;
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} ACL_BINHASH_ITER;
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/**
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* 创建一个哈希表
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* @param size {int} 哈希表的初始化大小
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* @param flag {unsigned int} 哈希表属性标志位, ACL_BINHASH_FLAG_xxx
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* @return {ACL_BINHASH*} 新创建的哈希表指针
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*/
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ACL_API ACL_BINHASH *acl_binhash_create(int size, unsigned int flag);
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#define ACL_BINHASH_FLAG_KEY_REUSE (1 << 0)
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#define ACL_BINHASH_FLAG_SLICE_RTGC_OFF (1 << 1)
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#define ACL_BINHASH_FLAG_SLICE1 (1 << 2)
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#define ACL_BINHASH_FLAG_SLICE2 (1 << 3)
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#define ACL_BINHASH_FLAG_SLICE3 (1 << 4)
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/**
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* 向哈希表中添加对象
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* @param table {ACL_BINHASH*} 哈希表指针
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* @param key {const void*} 哈希键
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* @param key_len {int} key 的长度
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* @param value {void*} 键值
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* @return {ACL_BINHASH_INFO*} 新创建的哈希条目指针
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*/
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ACL_API ACL_BINHASH_INFO *acl_binhash_enter(ACL_BINHASH *table, const void *key, int key_len, void *value);
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/**
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* 从哈希表中根据键名取得对应的哈希条目
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* @param table {ACL_BINHASH*} 哈希表指针
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* @param key {const void*} 哈希键
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* @param key_len {int} key 的长度
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* @return {ACL_BINHASH_INFO*} 哈希条目指针
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*/
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ACL_API ACL_BINHASH_INFO *acl_binhash_locate(ACL_BINHASH *table, const void *key, int key_len);
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/**
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* 查询某个哈希键的键值
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* @param table {ACL_BINHASH*} 哈希表指针
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* @param key {const void*} 哈希键
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* @param key_len {int} key 的长度
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* @return {void*} 哈希键值
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*/
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ACL_API void *acl_binhash_find(ACL_BINHASH *table, const void *key, int key_len);
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/**
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* 删除某个哈希项
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* @param table {ACL_BINHASH*} 哈希表指针
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* @param key {const void*} 哈希键
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* @param key_len {int} key 的长度
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* @param free_fn {void (*)(void*)} 用来释放哈希键值的函数指针，如果为空则不在内部释放键值
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* @return {int} 0: ok, -1: error
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*/
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ACL_API int acl_binhash_delete(ACL_BINHASH *table, const void *key, int key_len, void (*free_fn) (void *));
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/**
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* 释放哈希表
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* @param table {ACL_BINHASH*} 哈希表指针
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* @param free_fn {void (*)(void*)} 如果不为空，则用此函数来释放哈希表内的所有键值
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*/
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ACL_API void acl_binhash_free(ACL_BINHASH *table, void (*free_fn) (void *));
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/**
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* 遍历整个哈希表，并用用户给出的回调函数操作哈希表中的键值
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* @param table {ACL_BINHASH*} 哈希表指针
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* @param walk_fn {void (*)(ACL_BINHASH_INFO*, void*)} 在遍历哈希表中的每个元素时的回调函数
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* @param arg {void*} 用户传递的参数，作为参数在 walk_fn 中传递
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*/
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ACL_API void acl_binhash_walk(ACL_BINHASH *table, void (*walk_fn) (ACL_BINHASH_INFO *, void *), void *arg);
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/**
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* 列出当前哈希表中的所有元素数组列表
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* @param table {ACL_BINHASH*} 哈希表指针
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* @return {ACL_BINHASH_INFO*} 哈希表中所有元素组成的ACL_BINHASH_INFO数组,
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* 该数组中的最后一个指针为 NULL
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*/
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ACL_API ACL_BINHASH_INFO **acl_binhash_list(ACL_BINHASH *table);
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/**
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* 获得哈希表操作时的出错号
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* @param table {ACL_BINHASH*} 哈希表指针
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* @return {int} 错误号
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*/
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ACL_API int acl_binhash_errno(ACL_BINHASH *table);
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#define ACL_BINHASH_STAT_OK 0
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#define ACL_BINHASH_STAT_INVAL 1
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#define ACL_BINHASH_STAT_DUPLEX_KEY 2
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#define ACL_BINHASH_STAT_NO_KEY 3
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/**
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* 返回哈希表当前的容器空间大小
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* @param table 哈希表指针
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* @return 哈希表的容器空间大小
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*/
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ACL_API int acl_binhash_size(const ACL_BINHASH *table);
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/**
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* 当前哈希表中对象的个数
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* @param table {ACL_BINHASH*} 哈希表指针
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* @return {int}
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*/
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ACL_API int acl_binhash_used(ACL_BINHASH *table);
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ACL_API ACL_BINHASH_INFO **acl_binhash_data(ACL_BINHASH *table);
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ACL_API const ACL_BINHASH_INFO *acl_binhash_iter_head(ACL_BINHASH *table, ACL_BINHASH_ITER *iter);
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ACL_API const ACL_BINHASH_INFO *acl_binhash_iter_next(ACL_BINHASH_ITER *iter);
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ACL_API const ACL_BINHASH_INFO *acl_binhash_iter_tail(ACL_BINHASH *table, ACL_BINHASH_ITER *iter);
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ACL_API const ACL_BINHASH_INFO *acl_binhash_iter_prev(ACL_BINHASH_ITER *iter);
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/*-------------------- 一些方便快捷的宏操作 --------------------------------*/
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#define ACL_BINHASH_ITER_KEY(iter) ((iter).ptr->key.c_key)
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#define acl_binhash_iter_key ACL_BINHASH_ITER_KEY
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#define ACL_BINHASH_ITER_VALUE(iter) ((iter).ptr->value)
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#define acl_binhash_iter_value ACL_BINHASH_ITER_VALUE
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/**
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* 遍历 ACL_BINHASH
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* @param iter {ACL_BINHASH_ITER}
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* @param table_ptr {ACL_BINHASH *}
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* @example:
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void test()
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{
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ACL_BINHASH *table = acl_binhash_create(10, 0);
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ACL_BINHASH_ITER iter;
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char *value, key[32];
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int i;
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for (i = 0; i < 100; i++) {
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value = (char*) acl_mystrdup("value");
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snprintf(key, sizeof(key), "key:%d", i);
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(void) acl_binhash_enter(table, key, strlen(key), value);
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}
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acl_binhash_foreach(iter, table) {
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printf("%s=%s\n", iter.ptr->key.c_key, iter.ptr->value);
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if (i == 50)
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break;
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}
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acl_binhash_free(table, acl_myfree_fn);
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}
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*/
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#if 0
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#define ACL_BINHASH_FOREACH(iter, table_ptr) \
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if (table_ptr) \
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for((iter).size = acl_binhash_size((table_ptr)), (iter).i = 0, \
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(iter).h = acl_binhash_data((table_ptr)); (iter).i < (iter).size; (iter).i++) \
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for ((iter).ptr = *(iter).h++; (iter).ptr; (iter).ptr = (iter).ptr->next)
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#define ACL_BINHASH_FOREACH_REVERSE(iter, table_ptr) \
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if (table_ptr) \
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for((iter).size = acl_binhash_size((table_ptr)), (iter).i = (iter).size - 1, \
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(iter).h = acl_binhash_data((table_ptr)) + (iter).i; (iter).i >= 0; (iter).i--) \
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for ((iter).ptr = *(iter).h--; (iter).ptr; (iter).ptr = (iter).ptr->next)
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#else
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#define ACL_BINHASH_FOREACH(iter, table_ptr) \
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if (table_ptr) \
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for((void) acl_binhash_iter_head((table_ptr), &iter); \
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(iter).ptr; \
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(void) acl_binhash_iter_next(&iter))
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#define ACL_BINHASH_FOREACH_REVERSE(iter, table_ptr) \
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if (table_ptr) \
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for((void) acl_binhash_iter_tail((table_ptr), &iter); \
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(iter).ptr; \
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(void) acl_binhash_iter_prev(&iter))
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#endif
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#define acl_binhash_foreach ACL_BINHASH_FOREACH
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#define acl_binhash_foreach_reverse ACL_BINHASH_FOREACH_REVERSE
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#ifdef __cplusplus
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}
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#endif
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#endif
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