documented file access functions

include/structs.h

@@ -4,6 +4,8 @@
 #include <ultra64.h>
 #include "model.h"
 #include "core2/vla.h"
+#include "enums.h"
+
 #define MERGE(a, b) a ## b
 
 #define UNK_TYPE(t) t
@@ -549,17 +551,17 @@ typedef struct {
 
 //Struct60s moved to top
 
-typedef struct{
-    void *unk0;
-    void *unk4;
-    void *unk8; //start_ptr
-    void *unkC; //current_ptr
-    void *unk10; //end_ptr
-    s32 unk14;
+typedef struct file_s {
+    void *asset_base_ptr;
+    void *asset_current_ptr;
+    void *base_ptr;
+    void *current_ptr;
+    void *end_ptr;
+    enum file_mode_e mode;
     u8 pad18[0x64];
-    s32 unk7C;
-    s32 unk80;
-}Struct61s; //file stream
+    s32 last_expected; // used in file_isNextByteExpected
+    s32 unk80; // always set to -1 and never used
+} File;
 
 typedef struct {
     s16 unk0;