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libft/ft_hashmap/ft_hashmap.c

@@ -0,0 +1,156 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_hashmap.c                                       :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: thrieg <thrieg@student.42mulhouse.fr>      +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/11/07 12:14:50 by thrieg            #+#    #+#             */
+/*   Updated: 2025/02/16 19:08:34 by thrieg           ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "ft_hashmap_private.h"
+
+//allocates an array of initial_size, and sets nb_elems/hashmap_size to 0
+//cmp is a function that returns 0 if both keys are the same
+//returns NULL if any allocation fails
+t_hashmap	*ft_create_hashmap(
+size_t initial_size,
+void (*free_key)(void *),
+void (*free_value)(void *),
+int (*cmp)(void *key, void *key_to_compare))
+{
+	t_hashmap	*map;
+
+	if (initial_size == 0)
+		return (NULL);
+	map = malloc(sizeof(t_hashmap));
+	if (!map)
+		return (NULL);
+	map->nb_elems = 0;
+	map->hashmap_size = initial_size;
+	map->cmp = cmp;
+	map->free_key = free_key;
+	map->free_value = free_value;
+	map->table = ft_calloc((initial_size), sizeof(t_list *));
+	if (!(map->table))
+		return (free(map), NULL);
+	return (map);
+}
+
+// Inserts a key-value pair into the hashmap, 
+//returns 0 for an error, 1 for remplaced value for a key and 2 for new key
+int	ft_hashmap_insert_element(
+t_hashmap *map,
+void *key,
+void *value,
+size_t hash)
+{
+	size_t			index;
+	t_list			*current;
+	t_hash_element	*element;
+
+	if (!map || !key)
+		return (0);
+	if ((map->nb_elems * 100) > map->hashmap_size * HASHMAP_FILL_PERCENT_MAX)
+		ft_resize_hashmap(map);
+	index = hash % map->hashmap_size;
+	current = map->table[index];
+	while (current)
+	{
+		if (map->cmp(((t_hash_element *)(current->content))->key, key) == 0)
+		{
+			map->free_value(((t_hash_element *)(current->content))->value);
+			return (((t_hash_element *)(current->content))->value = value, 1);
+		}
+		current = current->next;
+	}
+	element = ft_create_hash_element(key, value, hash);
+	if (!element)
+		return (0);
+	if (!ft_add_hashmap_element(index, map, element))
+		return (ft_free_hash_element(element, map), 0);
+	return (2);
+}
+
+//returns 1 if the element has been deleted
+//returns 0 if the element has not been found
+int	ft_delete_hashmap_element(t_hashmap *map, void *key, size_t hash)
+{
+	size_t			index;
+	t_list			*curr;
+	t_list			*prev;
+	t_hash_element	*elem;
+
+	if (!map || !key || map->hashmap_size == 0)
+		return (0);
+	if (((map->nb_elems * 100) / map->hashmap_size)
+		<= HASHMAP_FILL_PERCENT_BEFORE_SHRINK)
+		ft_shrink_hashmap(map);
+	index = hash % map->hashmap_size;
+	curr = map->table[index];
+	prev = NULL;
+	while (curr)
+	{
+		elem = (t_hash_element *)curr->content;
+		if (map->cmp(elem->key, key) == 0)
+		{
+			return (ft_delete_hashmap_list_node(curr, prev, index, map), 1);
+		}
+		prev = curr;
+		curr = curr->next;
+	}
+	return (0);
+}
+
+//returns a pointer to the value of key, or a NULL pointer if not found
+void	*ft_lookup_hashmap_element(t_hashmap *map, void *key, size_t hash)
+{
+	size_t			index;
+	t_list			*curr;
+	t_hash_element	*elem;
+
+	if (!map || !key || map->hashmap_size == 0)
+		return (NULL);
+	index = hash % map->hashmap_size;
+	curr = map->table[index];
+	while (curr)
+	{
+		elem = (t_hash_element *)curr->content;
+		if (map->cmp(elem->key, key) == 0)
+			return (elem->value);
+		curr = curr->next;
+	}
+	return (NULL);
+}
+
+//frees the entire hashmap and then returns NULL once done
+void	*ft_free_hashmap(t_hashmap *map)
+{
+	size_t			index;
+	t_list			*curr;
+	t_list			*next;
+	t_hash_element	*elem;
+
+	if (!map)
+		return (NULL);
+	if (!map->table)
+		return (free(map), NULL);
+	index = 0;
+	while (index < map->hashmap_size)
+	{
+		curr = map->table[index];
+		while (curr)
+		{
+			next = curr->next;
+			elem = (t_hash_element *)curr->content;
+			ft_free_hash_element(elem, map);
+			free(curr);
+			curr = next;
+		}
+		index++;
+	}
+	free(map->table);
+	return (free(map), NULL);
+}

libft/ft_hashmap/ft_hashmap_advanced_type_hash.c

@@ -0,0 +1,57 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_hashmap_advanced_type_hash.c                    :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: thrieg <thrieg@student.42mulhouse.fr>      +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/11/07 12:47:23 by thrieg            #+#    #+#             */
+/*   Updated: 2025/02/16 19:08:26 by thrieg           ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "ft_hashmap_private.h"
+#include <stdint.h>
+
+//hash function for an address, returns a size_t between 0 and size_t max
+size_t	ft_hash_address(const void *key)
+{
+	uintptr_t	address;
+
+	address = (uintptr_t)key;
+	return ((size_t)address >> 3);
+}
+
+// Hash function for a t_list, returns a size_t between 0 and size_t max
+//takes the function to hash a single element
+size_t	ft_hash_list(const t_list *list)
+{
+	return (ft_hash_address(list));
+}
+
+// Hash function for a t_hashmap, returns a size_t between 0 and size_t max
+size_t	ft_hash_hashmap(const t_hashmap *hashmap)
+{
+	return (ft_hash_address(hashmap));
+}
+
+// Hash function for a t_vector, returns a size_t between 0 and size_t max
+size_t	ft_hash_vector(const t_vector *vec)
+{
+	size_t	i;
+	int		c;
+	size_t	index;
+	size_t	hash;
+	char	*str;
+
+	hash = 5381;
+	index = vec->index;
+	str = vec->buffer;
+	i = 0;
+	while (i < index)
+	{
+		c = str[i++];
+		hash = ((hash << 5) + hash) + c;
+	}
+	return (hash);
+}

libft/ft_hashmap/ft_hashmap_basic_cmp.c

@@ -0,0 +1,79 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_hashmap_basic_cmp.c                             :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: thrieg <thrieg@student.42mulhouse.fr>      +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/11/08 13:18:52 by thrieg            #+#    #+#             */
+/*   Updated: 2025/02/16 19:08:27 by thrieg           ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "ft_hashmap_private.h"
+#include <limits.h>
+
+// Comparison function for integers
+int	int_cmp(void *key1, void *key2)
+{
+	int	a;
+	int	b;
+
+	a = *(int *)key1;
+	b = *(int *)key2;
+	if (a < b)
+		return (-1);
+	else if (a > b)
+		return (1);
+	else
+		return (0);
+}
+
+// Comparison function for strings
+int	cmp_str(void *key1, void *key2)
+{
+	return (ft_strcmp((char *)key1, (char *)key2));
+}
+
+// Comparison function for unsigned chars
+int	cmp_uchar(void *key1, void *key2)
+{
+	unsigned char	*c1;
+	unsigned char	*c2;
+
+	c1 = (unsigned char *)key1;
+	c2 = (unsigned char *)key2;
+	return (*c1 - *c2);
+}
+
+// Comparison function for unsigned integers
+int	uint_cmp(void *key1, void *key2)
+{
+	unsigned int	a;
+	unsigned int	b;
+
+	a = *(unsigned int *)key1;
+	b = *(unsigned int *)key2;
+	if (a < b)
+		return (-1);
+	else if (a > b)
+		return (1);
+	else
+		return (0);
+}
+
+// Comparison function for size_t
+int	sizet_cmp(void *key1, void *key2)
+{
+	size_t	a;
+	size_t	b;
+
+	a = *(size_t *)key1;
+	b = *(size_t *)key2;
+	if (a < b)
+		return (-1);
+	else if (a > b)
+		return (1);
+	else
+		return (0);
+}

libft/ft_hashmap/ft_hashmap_basic_type_hash.c

@@ -0,0 +1,57 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_hashmap_basic_type_hash.c                       :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: thrieg <thrieg@student.42mulhouse.fr>      +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/11/07 12:34:20 by thrieg            #+#    #+#             */
+/*   Updated: 2025/02/16 19:08:29 by thrieg           ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "ft_hashmap_private.h"
+
+// Integer hash function, returns a size_t between 0 and size_t max
+size_t	ft_hash_int(int value)
+{
+	return ((size_t)(value * 2654435761u));
+}
+
+// Unsigned integer hash function, returns a size_t between 0 and size_t max
+size_t	ft_hash_uint(unsigned int value)
+{
+	return ((size_t)(value * 2654435761u));
+}
+
+// Character hash function, returns a size_t between 0 and size_t max
+size_t	ft_hash_char(char value)
+{
+	return ((size_t)(value * 31));
+}
+
+// String hash function (DJB2), returns a size_t between 0 and size_t max
+size_t	ft_hash_string(const char *str)
+{
+	int		c;
+	size_t	hash;
+
+	hash = 5381;
+	while (*str)
+	{
+		c = *str++;
+		hash = ((hash << 5) + hash) + c;
+	}
+	return (hash);
+}
+
+// size_t hash function, returns a size_t between 0 and size_t max
+size_t	ft_hash_size_t(size_t value)
+{
+	value ^= value >> 33;
+	value *= 0xff51afd7ed558ccd;
+	value ^= value >> 33;
+	value *= 0xc4ceb9fe1a85ec53;
+	value ^= value >> 33;
+	return (value);
+}

libft/ft_hashmap/ft_hashmap_private.h

@@ -0,0 +1,46 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_hashmap_private.h                               :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: thrieg <thrieg@student.42mulhouse.fr>      +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/11/07 13:49:11 by thrieg            #+#    #+#             */
+/*   Updated: 2025/02/16 19:08:30 by thrieg           ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#ifndef FT_HASHMAP_PRIVATE_H
+# define FT_HASHMAP_PRIVATE_H
+
+# include "../ft_hashmap.h"
+
+typedef struct s_hash_element
+{
+	void	*key;
+	void	*value;
+	size_t	hash;
+}	t_hash_element;
+
+t_hash_element	*ft_create_hash_element(void *key, void *value, size_t hash);
+void			ft_free_hash_element(t_hash_element *elem, t_hashmap *map);
+int				ft_add_hashmap_element(
+					size_t index,
+					t_hashmap *map,
+					t_hash_element *elem);
+int				ft_add_hashmap_element(
+					size_t index,
+					t_hashmap *map,
+					t_hash_element *elem);
+void			ft_copy_hashmap_table(
+					t_list **new_table,
+					t_list **old_table,
+					size_t new_size,
+					size_t old_size);
+void			ft_delete_hashmap_list_node(
+					t_list *curr,
+					t_list *prev,
+					size_t index,
+					t_hashmap *map);
+
+#endif

libft/ft_hashmap/ft_hashmap_utils.c

@@ -0,0 +1,70 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_hashmap_utils.c                                 :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: thrieg <thrieg@student.42mulhouse.fr>      +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/11/07 13:51:48 by thrieg            #+#    #+#             */
+/*   Updated: 2025/02/16 19:08:32 by thrieg           ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "ft_hashmap_private.h"
+
+void	ft_free_hash_element(t_hash_element *elem, t_hashmap *map)
+{
+	if (map->free_key)
+		map->free_key(elem->key);
+	if (map->free_value)
+		map->free_value(elem->value);
+	free(elem);
+}
+
+// Helper function to create a new hash element
+t_hash_element	*ft_create_hash_element(void *key, void *value, size_t hash)
+{
+	t_hash_element	*new_element;
+
+	new_element = malloc(sizeof(t_hash_element));
+	if (!new_element)
+		return (NULL);
+	new_element->key = key;
+	new_element->value = value;
+	new_element->hash = hash;
+	return (new_element);
+}
+
+//returns 0 for allocation fail without allocating or freeing anything
+int	ft_add_hashmap_element(size_t index, t_hashmap *map, t_hash_element *elem)
+{
+	t_list	*new_node;
+
+	new_node = malloc(sizeof(t_list));
+	if (!new_node)
+		return (0);
+	new_node->content = elem;
+	new_node->next = map->table[index];
+	map->table[index] = new_node;
+	map->nb_elems++;
+	return (1);
+}
+
+//returns 0 without doing anything if the allocation of the new table fails
+//in that case the old table is still valid!
+//returns 1 if the resize is a success
+int	ft_resize_hashmap(t_hashmap *map)
+{
+	size_t	new_size;
+	t_list	**new_table;
+
+	new_size = map->hashmap_size * HASHMAP_RESIZE_FACTOR;
+	new_table = ft_calloc(new_size, sizeof(t_list *));
+	if (!new_table)
+		return (0);
+	ft_copy_hashmap_table(new_table, map->table, new_size, map->hashmap_size);
+	free(map->table);
+	map->table = new_table;
+	map->hashmap_size = new_size;
+	return (1);
+}

libft/ft_hashmap/ft_hashmap_utils_two.c

@@ -0,0 +1,85 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_hashmap_utils_two.c                             :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: thrieg <thrieg@student.42mulhouse.fr>      +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/11/07 16:04:36 by thrieg            #+#    #+#             */
+/*   Updated: 2025/02/16 19:08:31 by thrieg           ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "ft_hashmap_private.h"
+
+//doesn't allocate anything no error possible
+void	ft_copy_hashmap_table(
+t_list **new_table,
+t_list **old_table,
+size_t new_size,
+size_t old_size)
+{
+	t_list			*curr;
+	t_list			*next;
+	t_hash_element	*elem;
+	size_t			i;
+	size_t			new_index;
+
+	i = 0;
+	while (i < old_size)
+	{
+		curr = old_table[i];
+		while (curr)
+		{
+			next = curr->next;
+			elem = (t_hash_element *)curr->content;
+			new_index = elem->hash % new_size;
+			curr->next = new_table[new_index];
+			new_table[new_index] = curr;
+			curr = next;
+		}
+		i++;
+	}
+}
+
+//helper function for delete_hashmap_element to delete the node once found
+void	ft_delete_hashmap_list_node(
+t_list *curr,
+t_list *prev,
+size_t index,
+t_hashmap *map)
+{
+	t_hash_element	*elem;
+
+	elem = (t_hash_element *)curr->content;
+	if (prev)
+		prev->next = curr->next;
+	else
+		map->table[index] = curr->next;
+	ft_free_hash_element(elem, map);
+	free(curr);
+	map->nb_elems--;
+}
+
+//returns 0 without doing anything if the allocation of the new table fails
+//or if the table is too little in that case the old table is still valid!
+//returns 1 if the shrink is a success
+int	ft_shrink_hashmap(t_hashmap *map)
+{
+	size_t	new_size;
+	t_list	**new_table;
+
+	if (map->hashmap_size == HASHMAP_MINIMUM_SIZE)
+		return (0);
+	new_size = map->hashmap_size / HASHMAP_SHRINK_FACTOR;
+	if (new_size < HASHMAP_MINIMUM_SIZE)
+		new_size = HASHMAP_MINIMUM_SIZE;
+	new_table = ft_calloc(new_size, sizeof(t_list *));
+	if (!new_table)
+		return (0);
+	ft_copy_hashmap_table(new_table, map->table, new_size, map->hashmap_size);
+	free(map->table);
+	map->table = new_table;
+	map->hashmap_size = new_size;
+	return (1);
+}