Started hash map implementation

src/map.h

@@ -0,0 +1,64 @@
+#ifndef MAP_H
+#define MAP_H
+
+#define RESULT_MSG_SIZE 64
+
+// Initial capacity and load factor threshold
+#define INITIAL_CAP 4
+#define LOAD_FACTOR_THRESHOLD 0.75
+
+// FNV-1a constants
+#define FNV_OFFSET_BASIS_64 0xCBF29CE484222325
+#define FNV_PRIME_64 0x00000100000001B3
+
+#include <stdint.h>
+#include <stddef.h>
+
+typedef enum {
+    MAP_OK = 0x0,
+    MAP_ERR_ALLOCATE,
+    MAP_ERR_INVALID,
+    MAP_ERR_NOT_FOUND
+} map_status_t;
+
+typedef enum {
+    ENTRY_EMPTY = 0x0,
+    ENTRY_OCCUPIED,
+    ENTRY_DELETED
+} element_state_t;
+
+typedef struct {
+    char *key;
+    void *value;
+    element_state_t state;
+} map_element_t;
+
+typedef struct {
+    map_element_t *elements;
+    size_t capacity;
+    size_t size;
+    size_t tombstone_count;
+} map_t;
+
+typedef struct {
+    map_status_t status;
+    uint8_t message[RESULT_MSG_SIZE];
+    union {
+        map_t *map;
+        void *element;
+    } value;
+} map_result_t;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+map_result_t map_new();
+map_result_t map_add(map_t *map, const char *key, void *value);
+map_result_t map_get(const map_t *map, const char *key);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif