88 lines
2.2 KiB
C
88 lines
2.2 KiB
C
#ifndef CWS_HASHMAP_H
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#define CWS_HASHMAP_H
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#include <stdbool.h>
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#include <sys/socket.h>
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/* Each process on Linux can have a maximum of 1024 open file descriptors */
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#define CWS_HASHMAP_MAX_CLIENTS 1024
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/**
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* @brief Client Hashmap struct
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*
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*/
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typedef struct cws_bucket_t {
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int sockfd; /**< Client socket descriptor */
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struct sockaddr_storage sas; /**< Associated socket address */
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struct cws_bucket_t *next; /**< Next node in case of collision */
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struct cws_bucket_t *prev; /**< Previous node in case of collision */
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} cws_bucket;
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/**
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* @brief Calculates the hash code of a given file descriptor
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*
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* @param[in] sockfd The file descriptor
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* @return Returns the hash code
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*/
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int cws_hm_hash(int sockfd);
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/**
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* @brief Initializes the hash map
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*
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* @param[out] bucket The hash map uninitialized
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*/
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void cws_hm_init(cws_bucket *bucket);
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/**
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* @brief Inserts a key in the hash map
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*
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* @param[out] bucket The hash map
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* @param[in] sockfd The file descriptor (value)
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* @param[in] sas The sockaddr (value)
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*/
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void cws_hm_push(cws_bucket *bucket, int sockfd, struct sockaddr_storage *sas);
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/**
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* @brief Removes a key from the hash map
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*
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* @param[out] bucket The hash map
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* @param[in] sockfd The key
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*/
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void cws_hm_remove(cws_bucket *bucket, int sockfd);
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/**
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* @brief Searches for a key in the hash map
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*
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* @param[in] bucket The hash map
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* @param[in] sockfd The file descriptor (key)
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* @return Returns NULL or the key pointer
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*/
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cws_bucket *cws_hm_lookup(cws_bucket *bucket, int sockfd);
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/**
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* @brief Cleans the hash map
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*
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* @param[out] bucket The hash map
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*/
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void cws_hm_free(cws_bucket *bucket);
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/**
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* @brief Checks if a file descriptor is in the bucket array (not linked list)
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*
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* @param[in] bucket
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* @param[in] sockfd
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* @return true If the file descriptor is in the bucket array
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* @return false If the file descriptor is not in the bucket array (check with hm_lookup())
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*/
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bool cws_hm_is_in_bucket_array(cws_bucket *bucket, int sockfd);
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/**
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* @brief This function will add a key even if it exists (use hm_push() instead)
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*
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* @param bucket
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* @param sockfd
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* @param sas
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*/
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void cws_hm_insert(cws_bucket *bucket, int sockfd, struct sockaddr_storage *sas);
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#endif |