86 lines
2.1 KiB
C
86 lines
2.1 KiB
C
#ifndef __HASHMAP_C__
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#define __HASHMAP_C__
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#include <stdbool.h>
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#include <stdlib.h>
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#include <string.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 HASHMAP_MAX_CLIENTS 1024
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typedef struct bucket {
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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 bucket *next; /**< Next node in case of collision */
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struct bucket *prev; /**< Previous node in case of collision */
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} bucket_t;
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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 sockfd[in] The file descriptor
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* @return int Returns the hash code
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*/
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int 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 bucket[out] The hash map uninitialized
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*/
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void hm_init(bucket_t *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 bucket[out] The hash map
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* @param sockfd[in] The file descriptor (value)
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* @param sas[in] The sockaddr (value)
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*/
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void hm_push(bucket_t *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 bucket[out] The hash map
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* @param sockfd[in] The key
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*/
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void hm_remove(bucket_t *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 bucket[in] The hash map
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* @param sockfd[in] The file descriptor (key)
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* @return struct hashmap* Returns NULL or the key pointer
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*/
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bucket_t *hm_lookup(bucket_t *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 bucket[out] The hash map
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*/
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void hm_free(bucket_t *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 bucket[in]
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* @param sockfd[in]
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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 hm_is_in_bucket_array(bucket_t *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 hm_insert(bucket_t *bucket, int sockfd, struct sockaddr_storage *sas);
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#endif |