Added permissions enum and inode table struct, add several function that operate on inodes

inode.h

@@ -3,31 +3,54 @@
 
 #include <stdint.h>
 #include <stdlib.h>
+#include <stdbool.h>
+#include <string.h>
 
 #include "util.h"
 
 typedef struct Inode Inode;
 
+enum permissions {
+    R = 1,
+    W = 2,
+    X = 4
+};
+
+struct inode_table {
+    // the following keyword spam purely exist so I definitely see it with highlighting.
+    // NOTE, TODO, FIXME, DEPRECATED, HACK, IMPORTANT: always initialize all values to be null when the inode table is created!!!!
+    // TODO: Change currently hardcoded value to actually accurately describe the size of the filesystem, only for temporary purposes.
+    Inode* inodes[640000];
+    uint32_t size;
+    uint32_t used_inodes;
+    uint32_t free_inodes;
+};
+
 struct Inode {
     // file information
     char name[64];
     uint32_t filesize;
 
     // ownership and permissions
-    uint16_t permissions;
+    uint8_t user_permissions;
+    uint8_t group_permissions;
+
+    // UID
     uint16_t owner;
+    // GID
     uint16_t group;
 
     // timestamps
     tm created;
     tm last_modified;
 
-    // fs attributes
-    uint32_t index;
     uint16_t block_count;
     block* data_block;
 };
 
-Inode* create_inode(char name[64], uint16_t owner, uint16_t group, block* data_block);
+Inode* create_inode(char name[64], uint8_t user_permissions, uint8_t group_permissions, uint16_t owner, uint16_t group, block* data_block);
+Inode* find_inode(char filename[], struct inode_table* itable);
+bool inode_exists(struct inode_table* itable, char filename[]);
+void delete_inode(struct inode_table* itable, char filename[]);
 
 #endif // INODE_H_